Disclosure of Invention
In view of the above problems, the present invention aims to provide a dual power circuit system and a dual power circuit control method capable of effectively switching a storage battery and a standby power of a whole vehicle.
The dual power supply circuit system of the present invention is characterized by comprising:
A first power supply circuit for supplying a first power supply;
The second power supply circuit is used as a standby power supply of the first power supply circuit, a high-voltage power supply is obtained as input, and the high-voltage power supply is provided as a second power supply after being transformed; and
And the microprocessor is used for realizing switching control between the first power supply circuit and the second power supply circuit, wherein the second power supply circuit is enabled when the microprocessor detects that the first power supply circuit works normally.
Optionally, the method further comprises: and a first switch (S4) arranged between the second power supply circuit and the microprocessor and enabled by the microprocessor, wherein a first end (Vfb) of the first switch is connected with the second power supply circuit, and a second end (HVLV) of the first switch is connected with the microprocessor.
Optionally, the voltage value of the second terminal is set to a prescribed threshold value, where the prescribed threshold value is located within the operating voltage range of the first power supply circuit.
Optionally, the method further comprises: and a second switch (D3) configured to cause the second power supply circuit to supply power when the output voltage of the first power supply circuit is less than the prescribed threshold.
Optionally, the second power supply circuit is an inverter.
Optionally, the inverter is configured to operate for a prescribed period of time while maintaining inverter peak conditions and thereafter shut down inverter power levels.
Optionally, the microprocessor is configured to read the voltage of the second terminal in the case of enabling the first switch, and determine whether to be supplied by the second power supply circuit according to the voltage of the second terminal.
Optionally, the microprocessor further comprises:
the counter is used for counting the abnormal power failure condition of the microprocessor;
A memory for storing a count value of the counter; and
And the control module is used for controlling the first power supply circuit to supply power under the condition that the count value is larger than a preset threshold value.
Optionally, the microprocessor determines whether the second switch is operating normally by comparing the voltage value of the second terminal (HVLV) of the first switch with the output voltage value (kl30_p) of the first power supply circuit.
Optionally, the method further comprises:
The active discharging module is used for realizing the active discharging of the high-voltage power supply; and
A digital isolation module for realizing the digital isolation between the active discharging module and the microprocessor,
Wherein the active discharge module is configured to be activated when the digital isolation module is powered down.
Optionally, the active discharge module is configured to employ a pulsed discharge mode until the high voltage power source is absent.
Optionally, a high-voltage detection module is used for performing high-voltage detection and inputting a high-voltage detection result to the microprocessor; and
And the analog isolation module is used for realizing analog isolation between the high-voltage detection module and the high-voltage power supply side.
Optionally, the method further comprises:
And the overvoltage protection module is arranged between the analog isolation module and the microprocessor and is used for realizing overvoltage protection.
The vehicle of the present invention is characterized by comprising the dual power supply circuit system.
The switching method of the dual power supply circuit of the invention realizes the switching of the first power supply circuit and the second power supply circuit by utilizing a microprocessor, and is characterized in that the method comprises the following steps:
A first step of: enabling a first power supply circuit and powering the microprocessor by the first power supply circuit;
And a second step of: judging whether the first power supply circuit works normally or not, and enabling the second power supply circuit under the condition that the first power supply circuit works normally as a judging result;
and a third step of: judging whether the second power supply circuit works normally or not, and enabling the first power supply circuit to not work under the condition that the second power supply circuit works normally.
Optionally, after the third step, further comprising:
fourth step: judging whether the microprocessor is abnormally powered down, and enabling the first power supply circuit to work under the condition that the judging result is that the microprocessor is abnormally powered down.
The computer-readable medium of the present invention, on which a computer program is stored, is characterized in that,
The computer program, when executed by the processor, implements the switching method of the dual power supply circuit described above.
The computer equipment comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, and is characterized in that the processor realizes the switching method of the dual power supply circuit when executing the computer program.
As described above, according to the present invention, the switching between the backup power source and the vehicle battery and the loop self-test problem can be solved. Further, according to the present invention, the active discharge function, the high voltage detection function, and the overvoltage protection function can be integrated in the backup power supply design. Furthermore, according to the invention, the active discharging circuit can be activated under the abnormal condition of the inverter, thereby ensuring that the high-voltage capacitance is discharged and realizing electrical safety.
Detailed Description
The following presents a simplified summary of the invention in order to provide a basic understanding of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention.
Fig. 1 is a circuit schematic diagram of a dual power circuit system according to an embodiment of the present invention. The present embodiment exemplifies a case where the dual power supply circuit system is applied to a vehicle.
As shown in fig. 1, the dual power circuit system according to an embodiment of the present invention includes:
A first power supply circuit KL30;
A second power supply circuit 10 (abbreviated as "FB") as a standby power supply for the first power supply circuit KL 30;
A microprocessor 20 (also simply referred to as "MCU" in fig. 2 below) supplied with power by the first power supply circuit KL30 or the second power supply circuit 10;
A first power management module 30 that performs power management on the first power circuit; and
A first power management module 40 enabled by microprocessor 20 via enable signal EN and implementing power management for second power circuit 10.
The second power supply circuit 10 receives a power supply from a high-voltage power source HVDC terminal (generally, for example, 60 to 450 v) as an input, and converts the high-voltage power supply to output a voltage Vfb, thereby providing the voltage as a second power supply.
Here, as one example, the second power supply circuit 10 employs a flyback (fly back) standby power supply. Flyback refers to that when a switching tube is switched on, an output transformer acts as an inductor, electric energy is converted into magnetic energy, and at the moment, an output loop has no current; in contrast, when the switching tube is turned off, the output transformer releases energy, magnetic energy is converted into electric energy, and current exists in the output loop.
After the first power supply circuit KL30 is powered on, the diode D1 is turned on, the switch S2 (normally closed switch) is turned on, the first power supply circuit KL30 works normally, the microcontroller 20 is powered on through the input terminal AD, and the system works normally. On the other hand, the second power supply circuit 10, which is a standby power supply after the high-voltage direct-current HVDC side is powered on, but the switch S4 (normally open switch) is turned off.
When the microprocessor 20 detects that the second power supply circuit 10 has a standby power supply power-up condition, the microprocessor 20 enables the switch S4, where the power-up condition refers to that the system power-up self-test is normal, that is, the circuit powered by the first power supply KL30 works normally, and it can be also implemented by judging whether the first power supply circuit KL30 works normally. At this time, the voltage value at the HVLV terminal (i.e., the high-voltage low-voltage terminal) in fig. 1 is about the output voltage of the second power supply circuit 10, where the output of the second power supply circuit 10 is set to 9V, and the first power supply circuit KL30 operates normally in the voltage range of 9-16V. It can be seen that the output of the second power supply circuit 10 is within the normal operating voltage range of the first power supply circuit KL 30.
When the voltage of the first power supply circuit KL30 is less than 9V due to some abnormality, the diode D3 is turned on, and the second power supply circuit 10 starts supplying power to the input terminal ADC of the microprocessor 20, whereby the normal operation of the whole system can be ensured.
The second power supply circuit 10 is constituted by a flyback standby power supply, for example, an inverter. As an example, the second power supply circuit 10 may be related to: enabling to maintain short-term operation, e.g. several seconds, under peak inverter conditions, after which the inverter power stage is turned off; the second power circuit 10 is designed to have a rated power equal to the standby power when the inverter is turned off, and a peak power equal to the low-voltage power required by the peak working condition of the inverter. Such index definition may optimize the design of the flyback standby power supply.
Further, the dual power circuit system according to an embodiment of the present invention may further include: an active discharge module 50 for realizing active discharge of the high-voltage power supply; and a digital isolation module 60 for implementing digital isolation between the active discharge module and the microprocessor.
As one example, the main discharge module 50 is configured to be activated when the digital isolation module 60 is powered down. The active discharge circuit 50 is started when the second power supply circuit 10 fails and the vehicle is in fault, and the discharge enable signal EN2 is transmitted to the active discharge circuit 50 through the digital isolation module 60. The active discharge circuit 50 should be designed to be active low and the digital isolation module 60 should be able to activate the active discharge function of the active discharge circuit 50 after power loss. The active discharge circuit 50 is designed, for example, in hardware, to complete the discharge within a prescribed rapid discharge time, and then to stop the discharge for several seconds, and should be able to continue using such pulsed discharge if one discharge fails, i.e., the high voltage is still present.
Further, the dual power circuit system according to an embodiment of the present invention may further include:
a high voltage detection module 70 for performing high voltage detection and inputting a high voltage detection result (hvdc_lv) to the microprocessor 20; and
The analog isolation module 80 is configured to implement analog isolation between the high voltage detection module 70 and the HVDC end of the high voltage power source.
The high-voltage power source HVDC end is detected by the high-voltage detection module 70 after passing through the analog isolation module 80 and is input into the microprocessor 20 for sampling, so that the real-time acquisition of the high-voltage signal is realized and is provided to the input end ADC end of the microprocessor 20 for controlling the second power source circuit 10.
Wherein, 5v_p and 5v_s of the analog isolation module 80 represent the power supply of the primary side and the secondary side of the isolation chip, respectively, and similarly, 5v_p and 5v_s of the digital isolation module 60 represent the power supply of the primary side and the secondary side of the isolation chip, respectively.
Further, the dual power circuit system according to an embodiment of the present invention may further include: an overvoltage protection module 90. The overvoltage protection module 90 is disposed between the analog isolation module 80 and the microprocessor 20 for implementing overvoltage protection, and supplies the overvoltage-protected voltage OVP to the input terminal D1 of the microprocessor 20.
Fig. 2 is a flow chart showing a dual power circuit system switching self-test according to an embodiment of the invention.
Next, a flow of switching self-test of the dual power circuit system according to an embodiment of the present invention will be described with reference to fig. 2.
In step S1, the first power supply circuit KL30 is powered on, the diode D1 is turned on, the switch S2 is turned on, and then the output terminal kl30_p of the first power supply circuit KL30 is powered on.
In step S2, it is determined whether the first power management module 30 is operating, and if yes, the process proceeds to step S3, and if no, the process proceeds to step S12. In step S12, it is determined that the diode D1 or the switch S2 is open, and the PEU (power electronic unit, a power electronic device of the vehicle, not shown in fig. 1) is safely turned off.
In step S3, as the first power management module 30 is operating, the microprocessor 20 is powered up and operating, and the switch S4 is enabled via the signal EN1, i.e., the HVLV terminal is powered up.
In step S4, the voltage value at HVLV terminal is read through the ADC port of the microprocessor 20, whether HVLV terminal is working normally (i.e. whether the second power supply circuit 10 is working normally) is determined, if it is determined that the voltage at HVLV terminal is abnormal, the system goes to step S13, the system goes to a controllable safe state, the second power supply circuit 10 stops supplying power, PEU is turned off safely, if it is determined that the voltage at HVLV terminal is normal, the microprocessor 20 turns off the switch S2 by instruction 'sw_uc=1', and closes the first power supply circuit KL30, at this time, attempts to take power from the standby second power supply circuit 10.
If the microprocessor 20 is powered down, this means that the standby power supply (the second power supply circuit 10) fails. Here, the microprocessor 20 may further be provided with: a counter 21 for counting the abnormal power-down of the microprocessor 20; a memory 22 for storing a count value of the counter; and a control module 23 for controlling so as to be supplied with power by the first power supply circuit in the case where the count value is greater than a preset threshold value.
Specifically, if the microprocessor 20 is abnormally powered down, the count value of the counter 21 is incremented by 1, and the memory 22 stores the abnormal electricity count value. As one example, the memory 22 is implemented by, for example, an E2 PROM.
Since sw_uc=0 after the microprocessor 20 is powered down, the process jumps to step S1, and the above steps are repeated, in step S5, the control module 23 of the microprocessor 20 determines whether the counter value n_fail > TBD of the abnormal power down (TBD is a preset threshold value), if yes, the process goes to step S14, and if no, the process goes to step S6. In step S14, it is determined that the diode D3 is open or the switch S4 is open, and the PEU is safely turned off.
In step S6, the first power supply circuit KL30 is turned off by sw_uc=1, so that the switch S2 is turned off.
Next, in step S7, it is determined whether the microprocessor 20 is powered down, if yes, the process goes to step S19, and if no, the process goes to step S8. In step S19, the counter value is incremented by 1 before the microprocessor 20 is powered down and returns to step S1.
In step S8, since the microprocessor 20 is not powered down, meaning that the second power supply circuit 10 as the standby power supply is powered up normally, the output voltage vkl30_p of the first power supply circuit KL30 is read.
In step S9, it is determined whether vkl30_p= HVLV-Vf. Where VF refers to the voltage drop of diode D3 and HVLV refers to the voltage at HVLV. If vkl30_p= HVLV-Vf is determined, the process proceeds to step S10, otherwise, the process proceeds to step S15 or step S17. In step S10, it is determined that the diode D3 is normal and the PEU is turned on in step S11.
In step S15, it is determined whether vkl30_p=kl30, if yes, the process proceeds to step S16, in which it is determined that the switch S2 is short-circuited in step S16, and the PEU is turned off, and if no, the process proceeds to step S17. Next, in step S17, it is determined whether kl30_p= HVLV, if yes, step S18 is continued, and in step S18, it is determined that the diode D3 is short-circuited, and the PEU is turned off.
As described above, according to the dual power supply circuit system and the dual power supply switching method of the present invention, switching between the backup power supply and the vehicle battery can be solved, and loop self-test of the backup power supply and the vehicle battery can be realized. Further, according to the present invention, the active discharge function, the high voltage detection function, and the overvoltage protection function can be integrated in the backup power supply design. Furthermore, according to the invention, the active discharging circuit can be activated under the abnormal condition of the inverter, thereby ensuring that the high-voltage capacitance is discharged and realizing electrical safety.
The above examples mainly illustrate the dual power supply circuitry of the present invention. Although only a few specific embodiments of the present invention have been described, those skilled in the art will appreciate that the present invention may be embodied in many other forms without departing from the spirit or scope thereof. Accordingly, the present examples and embodiments are to be considered as illustrative and not restrictive, and the invention is intended to cover various modifications and substitutions without departing from the spirit and scope of the invention as defined by the appended claims.