Disclosure of Invention
The application provides power supply equipment and a zero standby state control method, and provides zero standby power supply equipment based on a Type-A charging interface.
In a first aspect, the application provides a power supply device, which comprises an alternating current-direct current conversion circuit, a load switch, a Type-A charging port and a fast charging protocol chip;
The fast charging protocol chip is respectively and electrically connected with the alternating current-direct current conversion circuit, the load switch and the Type-A charging port, the alternating current-direct current conversion circuit is electrically connected with the load switch, and the load switch is electrically connected with the Type-A charging port;
The fast charging protocol chip is used for acquiring state information of the Type-A charging port after power-on preset time and under the condition that the fast charging protocol chip is free of abnormality, judging whether the Type-A charging port is accessed by a charging device or not based on the state information, if not, controlling the load switch to be switched from an on state to an off state, and also acquiring a small current signal of the Type-A charging port after the load switch is in the off state, judging whether the Type-A charging port is accessed by the small current charging device or not based on the small current signal, if yes, controlling the load switch to be in the on state so as to enable the power supply device to be in the charging state, otherwise, controlling the alternating current-direct current conversion circuit to be in the zero standby state, and controlling the fast charging protocol chip to be in the zero standby state after the alternating current-direct current conversion circuit is in the zero standby state so as to enable the power supply device to be in the zero standby state.
In one possible design, when the status information includes port current and communication signals:
The fast charging protocol chip is configured to obtain the port current of the Type-a charging port, and when the port current is less than or equal to a preset threshold and the communication signal is not received, determine that the Type-a charging port is not connected to the charging device, and control the load switch to switch from an on state to an off state.
In one possible design, before the fast charging protocol chip enters the zero standby state, the fast charging protocol chip is further configured to control the load switch to switch from the off state to the on state when the communication signal is received, so that the power supply device enters the charging state.
In one possible design, when the power supply device is in a zero standby state, the fast charging protocol chip is further configured to obtain an insertion detection voltage of the Type-a charging port, and when the insertion detection voltage is lower than a wake-up threshold, control itself to exit from the zero standby state, so that the power supply device exits from the zero standby state to enter the charging state.
In one possible design, the fast charging protocol chip is configured to obtain status information of the Type-a charging port, determine, based on the status information, whether the Type-a charging port has a charging device connected thereto, and if so, control the load switch to be in a conductive state, so that the power supply device is in a charging state.
In a second aspect, the present application provides a zero standby state control method applied to the power supply apparatus according to the first aspect, the method comprising:
after the power-on preset time is over, and under the condition that the power-on preset time is free of abnormality, acquiring state information of the Type-A charging port, judging whether charging equipment is connected to the Type-A charging port or not based on the state information, and if not, controlling the load switch to be switched from a conducting state to an off state;
After the load switch is in an off state, acquiring a small current signal of the Type-A charging port, judging whether the Type-A charging port is connected with small current charging equipment or not based on the small current signal, and if so, controlling the load switch to be in an on state so as to enable the power supply equipment to be in a charging state;
if not, the AC-DC conversion circuit is controlled to enter a zero standby state, and after the AC-DC conversion circuit enters the zero standby state, the fast charging protocol chip is controlled to enter the zero standby state so as to enable the power supply equipment to enter the zero standby state.
In one possible design, when the status information includes port current and communication signals:
The obtaining the state information of the Type-a charging port, judging whether the Type-a charging port has charging equipment connected on the basis of the state information, and if not, controlling the load switch to switch from an on state to an off state, including:
and acquiring the port current of the Type-A charging port, and when the port current is smaller than a preset threshold value and the communication signal is not received, judging that the Type-A charging port is not connected with the charging equipment, and controlling the load switch to be switched from an on state to an off state.
In one possible design, before the fast-charging protocol chip enters the zero standby state, the load switch is controlled to be switched from the off state to the on state when the communication signal is received, so that the power supply device enters the charging state.
In one possible design, when the power supply device is in a zero standby state, the insertion detection voltage of the Type-a charging port is obtained, and when the insertion detection voltage is lower than a wake-up threshold value, the fast charging protocol chip is controlled to exit the zero standby state, so that the power supply device exits the zero standby state and enters the charging state.
In one possible design, the state information of the Type-a charging port is obtained, and based on the state information, whether the Type-a charging port is accessed by a charging device is judged, if yes, the load switch is controlled to be in a conducting state, so that the power supply device is in a charging state.
The embodiment of the application has the beneficial effects that:
In the embodiment of the application, after a quick charge protocol chip is electrified for a preset time period and under the condition that the quick charge protocol chip is free of abnormality, whether a Type-A charging port is accessed by a charging device is judged based on state information by acquiring state information of the Type-A charging port, when the Type-A charging port is accessed by the charging device, a load switch is controlled to be switched from an on state to an off state, after the load switch is in the off state, a zero standby state preprocessing process is carried out, in the process, whether the Type-A charging port is accessed by a small current charging device is detected, when the Type-A charging port is accessed by the small current charging device, the load switch is controlled to be in the on state, so that the power supply device is in the charging state, when the Type-A charging port is not detected to be accessed by the small current charging device, an alternating current-direct current conversion circuit is controlled to be in the zero standby state, and after the alternating current-direct current conversion circuit is in the zero standby state, the load switch is controlled to be in the zero standby state, so that the power supply device is in the zero standby state. Through the process, the zero standby power supply equipment based on the Type-A charging interface can be provided.
Detailed Description
In the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or" describes an association of associated objects, meaning that there may be three relationships, e.g., A and/or B, and that there may be A alone, while A and B are present, and B alone, where A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one of a alone, b alone or c alone may represent a alone, b alone, c alone, a combination of a and b, a combination of a and c, b and c, or a combination of a, b and c, wherein a, b, c may be single or plural. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "center," "longitudinal," "transverse," "upper," "lower," "left," "right," "front," "rear," and the like refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.
The terms "connected," "connected," and "connected" are to be construed broadly and refer, for example, to a physical connection, an electrical connection or a signal connection, for example, to a direct connection, i.e., a physical connection, or an indirect connection via at least one element therebetween, and to a communication between two elements, as long as the electrical connection is achieved, and to a signal connection, for example, via a medium other than a circuit. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Currently, there are zero standby power supply devices on the market based on a Type-C charging interface, which generally includes a CC pin for determining the direction in which the charging device is inserted. For the power supply equipment with the Type-C charging interface, the output voltage of the power supply equipment is zero under the condition that no charging equipment is connected, and the voltage on the CC pin in the Type-C charging interface of the power supply equipment is pulled down under the condition that the charging equipment is connected, so that the control of the zero standby state can be realized through the change of the voltage on the CC pin for the power supply equipment with the Type-C charging interface. The specific control process is that when the power supply equipment detects that the voltage on the CC pin in the Type-C charging interface is not pulled down, no charging equipment is considered to be connected, and a zero standby state can be entered at the moment, when the power supply equipment is in the zero standby state, if the voltage on the CC pin in the Type-C charging interface is detected to be pulled down, the charging equipment is considered to be connected, and at the moment, the power supply equipment is awakened, exits from the zero standby state and enters the charging state.
The conventional Type-a interface for charging mainly includes a VBUS pin, a DP pin, a DM pin, and a GND pin. The VBUS and GND are power supply pins and are mainly used for charging the charging equipment, and the DP pin and the DM pin are quick charging protocol communication pins. The part of Type-a interface also comprises an ID pin, which is used for special function expansion in the fast charging application, and in practical application, the ID pin is also used for the fast charging protocol communication. Different brands of charging devices may employ different pins as the fast charge protocol communication pins for the fast charge protocol communication, and therefore, the signal variation across the different pins is different. If the ID pin is used as the insertion detection of the charging device, the Type-A interface cannot realize the insertion detection function of the device due to the fact that the ID pin is not universal. Similarly, most charging devices will perform fast charging protocol communication through the DP pin and the DM pin after the charging wire is inserted, but there are still some charging devices that do not perform fast charging protocol communication through the DP pin and the DM pin. Thus, device insertion detection is achieved only through the DP pin and the DM pin, and compatibility issues remain for the partial charging device.
For the above reasons, compared with the Type-C charging interface, the control method for realizing the zero standby state by the power supply equipment based on the Type-a charging interface is more complex, but no zero standby power supply equipment based on the Type-a charging interface exists in the market at present. Therefore, the embodiment of the application provides power supply equipment and a zero standby state control method, so as to provide zero standby power supply equipment based on a Type-A charging interface.
Referring to fig. 1, fig. 1 shows a power supply apparatus 1000 according to an embodiment of the present application, and as shown in fig. 1, the apparatus 1000 may include an ac-dc conversion circuit 100, a load switch 200, a Type-a charging port 300, and a fast charging protocol chip 400.
Referring to fig. 1, the fast charge protocol chip 400 is electrically connected to the ac-dc conversion circuit 100, the load switch 200, and the Type-a charging port 300, the ac-dc conversion circuit 100 is electrically connected to the load switch 200, and the load switch 200 is electrically connected to the Type-a charging port 300.
The fast charging protocol chip 400 is configured to obtain state information of the Type-a charging port 300 after a preset period of power up and under no abnormal condition, determine whether the Type-a charging port has charging equipment connected based on the state information, if not, control the load switch 200 to switch from an on state to an off state, and further obtain a small current signal of the Type-a charging port 300 after the load switch 200 is in the off state, and determine whether the Type-a charging port has the small current charging equipment connected based on the small current signal, if yes, control the load switch 200 to be in the on state so as to make the power supply equipment 1000 be in the charging state, and if not, control the ac-dc conversion circuit 100 to enter the zero standby state, and after the ac-dc conversion circuit 100 enters the zero standby state, control itself to enter the zero standby state so as to make the power supply equipment 1000 enter the zero standby state.
The power supply device in this embodiment may be a power adapter or a charging head, and the charging device is a commonly used electronic device with a Type-a charging port, including but not limited to a mobile phone, a tablet computer, a wearable device, a notebook computer, and the like. The low-current charging device may be a charging cable of the electronic tag, a combination of the charging cable of the electronic tag and the low-current device, or a combination of the charging cable of the non-electronic tag and the low-current device, which is not particularly limited in the present application. An electronic tag may be understood as a chip or a circuit unit of a charging cable, but is not limited to marking the voltage or current transmission capability of the charging cable.
The power supply apparatus 1000 is used for charging a charging apparatus, wherein the ac-dc conversion circuit 100 is used for converting ac power into dc power, and charging the charging apparatus through the load switch 200 and the Type-a charging port 300. The fast charging protocol chip 400 can be understood as a main control chip in a power supply device, and can acquire signals of the Type-a charging port 300, after the charging device is accessed, the fast charging protocol communication is performed with the fast charging protocol chip 400 based on the Type-a charging port 300, through protocol negotiation, the fast charging protocol chip 400 controls the ac-dc conversion circuit 100 to output corresponding voltage and current, and charges the charging device through the load switch 200 and the Type-a charging port 300. The fast charge protocol chip 400 may control the state of the load switch 200, and when the load switch 200 is turned on, the voltage and current output by the ac-dc conversion circuit 100 may be output to the outside through the load switch 200 and the Type-a charging port 300, and when the load switch 200 is turned off, the voltage and current output by the ac-dc conversion circuit 100 may not be output to the outside through the load switch 200 and the Type-a charging port 300.
And the power supply equipment is provided with a Type-C charging interface, and the output voltage of the power supply equipment is zero under the condition that no charging equipment is connected. Different with the Type-C interface that charges, the power supply equipment that possesses Type-A interface that charges whether has the access of battery charging outfit, load switch is in the state of switch-on always for Type-A interface that charges keeps the voltage output outward. Since the zero standby state requires standby power consumption less than 5mW, when the power supply apparatus enters the zero standby state, the load switch is required to be in an off state, and when there is charging apparatus access, the charging apparatus access can be effectively detected.
For the Type-A charging port, no universality is achieved due to the fact that a DP pin, a DM pin or an ID pin is adopted as the charging equipment insertion detection. However, after all the charging devices are connected to the power supply device, a certain amount of current is drawn on the VBUS pin, so that the output voltage on the VBUS pin is reduced, and therefore, the insertion detection of the charging devices can be realized through the VBUS pin, and compared with the detection of the insertion of the charging devices through the DP pin, the DM pin or the ID pin, the insertion detection of the charging devices is more universal. At present, load insertion detection is basically realized by detecting impedance or voltage on a VBUS pin, and the method for load insertion detection comprises the steps of closing output on the VBUS pin and raising impedance on the VBUS pin when the VBUS pin of the power supply equipment is in an idle state, and after the charging equipment is connected, because a port capacitor and the equipment end can draw current on the VBUS pin, pulling the high impedance of the power supply equipment low, and judging whether the charging equipment is inserted or not by the power supply equipment in the state of detecting the pull-down.
The quick charge protocol chip is electrically connected with the Type-A charging port, the magnitude of current drawn by the charging equipment or the voltage of the VBUS pin can be obtained by detecting the VBUS pin, and whether the charging equipment is in a quick charge protocol communication state can be judged by detecting the level change of the DP pin and the DM pin.
The fast charging protocol chip needs to perform internal self-checking and initialization information configuration within a preset power-on time period, wherein the preset time period can be set according to user needs, for example, the preset time period is 3 seconds. The internal self-check can comprise the detection of whether the temperature of the fast charge protocol chip is too high or whether the power supply voltage is normal or not.
After the quick charge protocol chip performs internal self-checking, abnormal states, such as over-high temperature or over-high power supply voltage, are not triggered, namely, state information of the Type-A charging port is obtained under the condition of no abnormality, whether charging equipment is connected to the Type-A charging port is judged based on the state information, and if no charging equipment is connected to the Type-A charging port, a load switch is controlled to be switched from an on state to an off state, and a zero standby state preprocessing process is performed.
Because in practical application, the Type-a charging port is connected to the low-current charging device, for example, when the low-current charging device is a charging cable with a charging tag, after the charging cable with the charging tag is connected to the Type-a charging port, a certain amount of current is drawn on the VBUS pin, and the current is usually in the uA (microampere) level. According to the method for judging whether the Type-A charging port is accessed by the charging equipment based on the state information, due to the fact that the accuracy of the quick-charging protocol chip is limited, whether the Type-A charging port is accessed by the low-current charging equipment cannot be accurately judged. Therefore, the zero standby state preprocessing process is required to judge again whether the Type-a charging port has a low current charging device connected.
The zero standby state preprocessing process comprises the steps of obtaining the voltage on a VBUS pin in a Type-A charging port after a load switch is in an off state through a fast charging protocol chip, obtaining a small current signal based on a built-in software algorithm according to the change rate of the voltage on the VBUS pin, judging that the Type-A charging port is connected with small current charging equipment when the small current signal is received, controlling the load switch to be in an on state so as to enable the power supply equipment to be in a charging state, and judging that the Type-A charging port is not connected with the small current charging equipment if the small current signal is not received.
The small current signal refers to a current signal generated by the small current charging device accessing the Type-A charging port, and the magnitude of the small current signal is usually in the magnitude of uA (microampere).
And judging whether the Type-A charging port is accessed by the low-current charging equipment or not again through the zero standby state preprocessing process, controlling the AC-DC conversion circuit to enter a zero standby state when judging that the Type-A charging port is accessed by the low-current charging equipment, and controlling the fast charging protocol chip to enter the zero standby state after the AC-DC conversion circuit enters the zero standby state so as to enable the power supply equipment to enter the zero standby state.
The pretreatment process in the zero standby state can realize detection of small-current charging equipment with the uA (microampere) magnitude so as to ensure that the power supply equipment is not charged when being connected with the small-current charging equipment with the current lower than 5 mA.
In the embodiment of the application, after a quick charge protocol chip is electrified for a preset time period and under the condition that the quick charge protocol chip is free of abnormality, whether a Type-A charging port is accessed by a charging device is judged based on state information by acquiring state information of the Type-A charging port, when the Type-A charging port is accessed by the charging device, a load switch is controlled to be switched from an on state to an off state, after the load switch is in the off state, a zero standby state preprocessing process is carried out, in the process, whether the Type-A charging port is accessed by a small current charging device is detected, when the Type-A charging port is accessed by the small current charging device, the load switch is controlled to be in the on state, so that the power supply device is in the charging state, when the Type-A charging port is not detected to be accessed by the small current charging device, an alternating current-direct current conversion circuit is controlled to be in the zero standby state, and after the alternating current-direct current conversion circuit is in the zero standby state, the load switch is controlled to be in the zero standby state, so that the power supply device is in the zero standby state. Through the process, the zero standby power supply equipment based on the Type-A charging interface can be provided.
In a possible embodiment, when the state information includes a port current and a communication signal, the fast charging protocol chip is configured to obtain the port current of the Type-a charging port, and when the port current is less than or equal to a preset threshold and the communication signal is not received, it is determined that the Type-a charging port has no charging device access, and the load switch is controlled to switch from an on state to an off state.
The fast charging protocol chip is electrically connected with the Type-A charging port, an ADC (analog to digital converter, analog-digital converter) adopts a circuit in the fast charging protocol chip, and the ADC adopts the circuit to sample a current signal or a voltage signal. The voltage on the VBUS pin or the magnitude of the current drawn by the charging equipment can be obtained by detecting the VBUS pin through the ADC by adopting a circuit, so that the port current drawn by the charging equipment can be obtained by detecting the VBUS pin; through detecting the level change of the DP pin and the DM pin, the communication signal for carrying out quick charge protocol communication with the charging equipment can be obtained, when the communication signal is received by the quick charge protocol chip, the quick charge protocol chip and the charging equipment are considered to be in a quick charge protocol communication state, and when the communication signal is not received by the quick charge protocol chip, the quick charge protocol chip and the charging equipment are considered to be not in a quick charge protocol communication state.
In this embodiment, after the fast charging protocol chip is powered on for a preset period of time and under the condition that the fast charging protocol chip is free of abnormality, the power supply equipment is considered to be in a non-protection state, then the port current Ibus on the VBUS pin in the Type-a charging port is obtained, when the port current Ibus is smaller than a preset threshold value and no communication signal is received, and when all conditions are met, it is determined that the Type-a charging port is free of charging equipment access, and then the load switch is controlled to be switched from a conducting state to a switching-off state. Wherein the preset threshold is typically set to a current of the order of milliamperes (mA), for example, the preset threshold is 3mA.
When the Type-A charging port is connected to a charging cable of an electronic tag, uA (microampere) magnitude current is extracted from a VBUS pin, and based on the limitation of sampling precision of an ADC (analog to digital converter) adopted circuit, if the port current Ibus is smaller than the sampling precision of the ADC adopted circuit, based on the port current, whether the Type-A charging port is connected to the charging cable of the electronic tag cannot be accurately judged.
In addition, when the Type-A charging port is connected with the small-current charging equipment which does not support the fast charging protocol, at the moment, the equipment does not support the fast charging protocol, and the port current Ibus is smaller than the sampling precision of an ADC adopting circuit, the Type-A charging port cannot be judged whether the Type-A charging port is connected with the small-current charging equipment which does not support the fast charging protocol based on the port current and the communication signal.
Therefore, the zero standby state preprocessing process is needed to judge whether the Type-A charging port is accessed by the low-current charging equipment again, so that higher-precision detection is realized, charging can be ensured when the low-current charging equipment is accessed, and the phenomenon of charging interruption does not occur.
In a possible embodiment, before the fast-charging protocol chip enters the zero standby state, the fast-charging protocol chip is further configured to control the load switch to switch from the off state to the on state when the communication signal is received, so that the power supply device enters the charging state.
Before the fast charging protocol chip enters a zero standby state, the communication signals for carrying out fast charging protocol communication with the charging equipment are obtained by detecting the level changes of the DP pin and the DM pin, when the communication signals are received, the charging equipment is judged to be connected in, or abnormal conditions, the type of an inserted cable is changed and the like are caused, and the load switch is controlled to be switched from an off state to an on state, so that the power supply equipment enters the charging state.
In this embodiment, before the fast charging protocol chip enters the zero standby state, by detecting the level changes of the DP pin and the DM pin, it is ensured that no charging device is connected before the fast charging protocol chip enters the zero standby state, and the charging device is immediately returned to the charging state when the charging device is detected to be connected, thereby providing a highly reliable foolproof mechanism.
In a possible embodiment, when the power supply device is in the zero standby state, the fast charging protocol chip is further configured to obtain an insertion detection voltage of the Type-a charging port, and when the insertion detection voltage is lower than the wake-up threshold, control itself to exit the zero standby state, so that the power supply device exits the zero standby state and enters the charging state.
When the power supply equipment is in a zero standby state, the detection of the insertion of the charging equipment can be realized through a load insertion detection method. At this time, the output on the VBUS pin is closed, the high impedance on the VBUS pin is pulled up, after the charging equipment is connected in, the high impedance of the power supply equipment is pulled up to be low, and the fast charging protocol chip controls the power supply equipment to exit from the zero standby state to enter the charging state by detecting the insertion detection voltage on the VBUS pin when the voltage is lower than the wake-up threshold value. Here, the wake-up threshold Vth is dynamically set, and in general, the wake-up threshold Vth is smaller than 3V, for example, the wake-up threshold Vth is 1V.
In an actual application scenario, if the power supply device is connected to a low-current charging device, for example, a charging cable with a electronic tag, after the charging cable with the electronic tag is connected to a Type-a charging port, a current of the uA (microampere) level is extracted on a VBUS pin, so that the voltage on the VBUS pin is reduced, if the wake-up threshold is set too high, the power supply device is woken up, the zero standby state is exited, a fault that the zero standby state is repeatedly entered occurs, and if the wake-up threshold is set too low, the power supply device cannot be woken up when the low-current charging device is connected, so that the low-current charging device cannot be charged.
To solve this failure, in the above embodiment, a determination is made again as to whether or not the Type-a charging port has a low-current charging device connected thereto through the zero standby state preprocessing process. Specifically, after the load switch is in an off state, the voltage on the VBUS pin in the Type-A charging port is obtained, a low-current signal is obtained based on a built-in software algorithm according to the change rate of the voltage on the VBUS pin, and when the low-current signal is received, a charging cable (or a low-current charging device) of a charging tag with a port current is considered to be connected to the Type-A charging port, and the load switch is controlled to be in a conducting state, so that the power supply device does not enter a zero standby state. The problem of repeatedly entering and exiting the zero standby state is avoided.
In the zero standby state preprocessing process, namely before entering the zero standby state, the Type-A charging port is ensured to be free of access of small-current charging equipment, for example, a charging cable of an electronic tag with port current can be pulled, a higher wake-up threshold value can be set, more sensitive charging equipment insertion detection is realized, and meanwhile, the situation that the small-current charging equipment cannot be charged can be avoided.
In a possible embodiment, the fast charging protocol chip is configured to obtain status information of the Type-a charging port, determine whether the Type-a charging port has a charging device connected thereto based on the status information, and if so, control the load switch to be in a conductive state so that the power supply device is in a charging state.
When the charging equipment is connected to the Type-A charging port of the power supply equipment, the load switch is controlled to be in a conducting state, so that the power supply equipment is in a charging state.
Referring to fig. 2, fig. 2 is a flowchart of zero standby implementation of a power supply device according to an embodiment of the present application, where, as shown in fig. 2, when a Type-a charging port of the power supply device has a charging device connected thereto, the power supply device is in a charging state. When the power supply equipment is in a non-protection STATE after being electrified for a preset period of time, the port current Ibus is smaller than a preset threshold value, and when the power supply equipment is not in a fast charge protocol STATE, all conditions are met, the fact that the Type-A charging port is not connected with the charging equipment is judged, the load switch is controlled to be switched from a conducting STATE to a switching-off STATE, and at the moment, the fast charge protocol chip is required to be configured into a MOS_close STATE.
The method comprises the steps of entering a zero standby STATE preprocessing process, detecting the access of small-current charging equipment reaching the uA (microampere) level to a Type-A charging PORT in the process, configuring a fast charging protocol chip into a PORT CHECK STATE STATE at the moment, controlling a load switch to be in a conducting STATE when the access of the small-current charging equipment to the Type-A charging PORT is detected, enabling power supply equipment to be in a charging STATE, and controlling an alternating current-direct current conversion circuit to enter the zero standby STATE when the access of the small-current charging equipment to the Type-A charging PORT is not detected, wherein the fast charging protocol chip is configured into an ACDC ZP STATE STATE at the moment.
After the AC-DC conversion circuit enters a zero standby STATE, the fast charging protocol chip is controlled to enter the zero standby STATE, and the fast charging protocol chip is configured into a ZP STATE STATE at the moment so that the power supply equipment enters the zero standby STATE.
Before the fast charging protocol chip enters a zero standby state, the load switch is controlled to be conducted and the charging state is returned by detecting the level change of the DP pin and the DM pin when the charging equipment is detected to be accessed. When the power supply equipment is in a zero standby state, and when detecting that the charging equipment is connected, the power supply equipment exits from the zero standby state to enter into a charging state.
According to the power supply equipment provided by the embodiment of the application, the state information of the Type-A charging port is acquired by adopting the high-precision ADC, whether the Type-A charging port is accessed by the charging equipment is detected, and whether the Type-A charging port is accessed by the low-current charging equipment is detected by the low-current signal, so that the scene coverage of a wider range is realized, the charging can be realized even when the low-current charging equipment is accessed, and the phenomenon of charging interruption is avoided.
Referring to fig. 3, fig. 3 is a control method for a zero standby state according to an embodiment of the present application, where the method is applied to the above power supply device, and the method includes:
S1, after power-on preset time length and under the condition that the power-on preset time length is not abnormal, acquiring state information of the Type-A charging port, judging whether the Type-A charging port is accessed by the charging equipment or not based on the state information, and if not, controlling the load switch to be switched from an on state to an off state.
S2, after the load switch is in an off state, acquiring a small current signal of the Type-A charging port, judging whether the Type-A charging port is connected with small current charging equipment or not based on the small current signal, and if so, controlling the load switch to be in an on state so as to enable the power supply equipment to be in a charging state.
S3, if not, controlling the alternating current-direct current conversion circuit to enter a zero standby state, and after the alternating current-direct current conversion circuit enters the zero standby state, controlling the fast charging protocol chip to enter the zero standby state so as to enable the power supply equipment to enter the zero standby state.
In the embodiment of the application, after a quick charge protocol chip is electrified for a preset time period and under the condition that the quick charge protocol chip is free of abnormality, whether a Type-A charging port is accessed by a charging device is judged based on state information by acquiring state information of the Type-A charging port, when the Type-A charging port is accessed by the charging device, a load switch is controlled to be switched from an on state to an off state, after the load switch is in the off state, whether the Type-A charging port is accessed by a small current charging device is detected, when the Type-A charging port is detected to be accessed by the small current charging device, the load switch is controlled to be in the on state so as to enable the power supply device to be in the charging state, when the Type-A charging port is not detected to be accessed by the small current charging device, an alternating current-direct current conversion circuit is controlled to be in the zero standby state, and after the alternating current-direct current conversion circuit is in the zero standby state, the load switch is controlled to be in the zero standby state so that the power supply device is in the zero standby state. Through the process, the zero standby power supply equipment based on the Type-A charging interface can be provided.
In one possible embodiment, when the state information includes a port current and a communication signal, the step S1 includes obtaining a port current of the Type-a charging port, and when the port current is smaller than a preset threshold and the communication signal is not received, determining that the Type-a charging port has no charging device access, and controlling the load switch to switch from an on state to an off state.
According to the embodiment of the application, whether the Type-A charging port is accessed by the charging equipment can be judged through detecting the magnitude of the port current and the communication signal.
In one possible embodiment, the method further comprises S4, before the fast-charging protocol chip enters the zero standby state, controlling the load switch to be switched from the off state to the on state when the communication signal is received, so that the power supply equipment enters the charging state.
In the embodiment of the application, before the fast charge protocol chip enters the zero standby state, the level change of the DP pin and the DM pin is detected, so that no charging equipment is connected before the fast charge protocol chip enters the zero standby state, and the charging equipment can be immediately returned to the charging state when the charging equipment is detected to be connected, thereby providing a high-reliability foolproof mechanism.
In a possible embodiment, the method further comprises S5, when the power supply equipment is in the zero standby state, acquiring the insertion detection voltage of the Type-A charging port, and when the insertion detection voltage is lower than the wake-up threshold value, controlling the fast charging protocol chip to exit the zero standby state so as to enable the power supply equipment to exit the zero standby state and enter the charging state.
In the embodiment of the application, when the power supply equipment is in the zero standby state, the insertion detection voltage needs to be acquired in real time, and when the insertion detection voltage is lower than the wake-up threshold value, a higher wake-up threshold value can be set, so that the more sensitive insertion detection of the charging equipment is realized, and the fast charging protocol chip is controlled to rapidly exit the zero standby state.
In a possible embodiment, the method further includes S6, obtaining state information of the Type-A charging port, judging whether the Type-A charging port is accessed by the charging device or not based on the state information, and if yes, controlling the load switch to be in a conducting state so as to enable the power supply device to be in a charging state.
In the embodiment of the application, when the charging equipment is connected to the Type-A charging port, the load switch is controlled to be kept in a conducting state so as to enable the power supply equipment to be in a charging state.
It should be noted that the above embodiments are merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.