CN114142435A - Intelligent high-frequency switching power supply - Google Patents

Abstract

The utility model discloses an intelligent high-frequency switching power supply, which comprises a shell, a middle frame and a PCB arranged on the middle frame, wherein the middle frame comprises two middle frame side plates which are oppositely arranged, a middle frame back plate connected with the side edges of the two middle frame side plates, and a supporting plate horizontally arranged between the two middle frame side plates, and the PCB is arranged on the supporting plate; the utility model discloses a solar cell module, including center curb plate, center backplate, shell, conducting material, a top plate, a backplate and U-shaped face-piece, the center curb plate with the center backplate is made by conducting material and is constructed as Faraday cage, the shell includes the face-piece of a bottom plate, a roof, a backplate and U-shaped, the backplate is made by conducting material and is located center backplate one side, its with center backplate electric connection just is at least to being equipped with two ground connection feet. The intelligent high-frequency switching power supply provided by the invention can isolate electromagnetic waves through the middle frame, and simultaneously, accumulated charges are guided in time through the arrangement of grounding, so that the electric shock phenomenon can not occur even in a humid use environment.

Description

Intelligent high-frequency switching power supply

Technical Field

The invention relates to a switch type voltage-stabilized power supply, in particular to an intelligent high-frequency switch power supply.

Background

In the application of power electronic technology and various power supply systems, the switching power supply technology is in the core position. The intelligent high-frequency switching power supply has the characteristics of high flexible combination and autonomous monitoring, and particularly has the characteristics of small volume, low noise, convenience in maintenance, capability of being incorporated into a computer monitoring system of a communication system and the like in the field of communication, so that the intelligent high-frequency switching power supply is very wide in application. The uninterrupted power supply system is formed by connecting the battery with the uninterrupted power supply system, and can be widely used in occasions requiring high-power direct-current power supplies, such as post and telecommunications, water conservancy electric power, public security, railways, computing centers and the like. However, the inventor found that since the switching power supply emits a large amount of high-frequency electromagnetic waves to the surrounding space during normal operation, the electromagnetic waves are concentrated and collected on the housing to form static electricity, and when a proper leakage loop or a person touches the housing, the external discharge occurs. Especially in wet weather, when workers touch the machine shell, electric shock is often felt.

In addition, the current intelligent high-frequency switching power supply often does not have a power switch, so that the switching power supply is very easy to damage under the condition of unstable voltage or current.

Disclosure of Invention

In view of the above problems in the prior art, an object of the present invention is to provide an intelligent high-frequency switching power supply with a protection circuit that can prevent the housing from being charged.

In order to achieve the above object, the present invention provides an intelligent high-frequency switching power supply, comprising a housing, a middle frame and a PCB board disposed on the middle frame, wherein,

the middle frame comprises middle frame side plates which are arranged in an opposite mode, a middle frame back plate which is connected to the side edges of the two middle frame side plates, and a supporting plate which is horizontally arranged between the two middle frame side plates, wherein the PCB is arranged on the supporting plate; the middle frame side plate and the middle frame back plate are made of conductive materials and are constructed into a Faraday cage, the shell comprises a bottom plate, a top plate, a back plate and a U-shaped face shell, the back plate is made of conductive materials and is positioned on one side of the middle frame back plate, and the back plate is electrically connected with the middle frame back plate and at least provided with two grounding pins in a pair mode;

the PCB is at least provided with a power output switch circuit, the power output switch circuit comprises a power switch, a protection switch and a protection circuit, and the protection circuit comprises a grid driver, a voltage detection unit, a current detection unit and a controller which are electrically connected; the power switch comprises a first drain electrode, a first source electrode and a first gate electrode which is used as a first control end, the protection switch comprises a second drain electrode, a second source electrode and a second gate electrode which is used as a second control end, the second drain electrode of the protection switch is electrically connected with the second source electrode of the power switch, and when the protection switch is switched to be in a conducting state, the power switch starts to work; the grid driver comprises a first isolation type grid driver and a second isolation type grid driver, wherein the first isolation type grid driver and the second isolation type grid driver respectively comprise an input end, an output end and a control end, the output end of the first isolation type grid driver is electrically connected with the control end of the power switch, and the output end of the second isolation type grid driver is electrically connected with the control end of the protection switch.

Preferably, the middle frame further comprises a middle frame bottom plate arranged between the two middle frame side plates, and a heat dissipation fan is arranged on the middle frame bottom plate; an air inlet is formed in one side, close to the middle frame bottom plate, of the face shell, and an air outlet is formed in one side, close to the supporting plate, of the face shell.

Preferably, the face shell is made of an insulating material.

Preferably, the power switch is a gan transistor, and the protection switch is an N-channel transistor.

Preferably, the voltage detection unit includes a first differential amplifier, an overvoltage protection circuit, a low voltage protection circuit, and a second pulse edge detection circuit; the input end of the first differential amplifier is electrically connected with the output end of the first isolation type grid driver, the input end of the overvoltage protection circuit is electrically connected with the output end of the first differential amplifier, the input end of the low-voltage protection circuit is electrically connected with the output end of the first differential amplifier, and the input end of the second pulse edge detection circuit is electrically connected with the output end of the first differential amplifier.

Preferably, the current detection unit includes a second differential amplifier and a second pulse edge detection circuit, an input end of the second differential amplifier is electrically connected to the source of the protection switch, and an input end of the second pulse edge detection circuit is electrically connected to an output end of the second differential amplifier.

Preferably, the controller is a single chip, and the controller is electrically connected to the control terminal of the first isolated gate driver, the input terminal and the control terminal of the secondisolated gate driver 104, the output terminal of the overvoltage protection circuit, the output terminal of the low voltage protection circuit, the output terminal of the second pulse edge detection circuit, the output terminal of the second differential amplifier, and the output terminal of the second pulse edge detection circuit.

Compared with the prior art, the intelligent high-frequency switching power supply provided by the invention can isolate electromagnetic waves through the middle frame, and can guide accumulated charges in time through grounding, so that the electric shock phenomenon can not occur even in a humid use environment. In addition, the intelligent high-frequency switching power supply can control the load through the power output switching circuit, and can effectively protect the power supply and the electric appliance when sudden overvoltage or overcurrent occurs.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

This document provides an overview of various implementations or examples of the technology described in this disclosure, and is not a comprehensive disclosure of the full scope or all features of the disclosed technology.

Drawings

Fig. 1 is a schematic perspective view of an intelligent high-frequency switching power supply according to the present invention.

Fig. 2 is a schematic diagram of a three-dimensional explosion structure of the intelligent high-frequency switching power supply of the invention.

Fig. 3 is a schematic circuit diagram of a PCB board of the intelligent high-frequency switching power supply of the present invention.

Description of reference numerals: 1 … outer shell; 11 … a bottom panel; 12 … a top plate; 13 … a shell; 131 … air inlet; 132 … air outlet; 14 … a back plate; 141 … ground pin; 15 … middle frame; 151 … middle frame side plate; 152 … middle frame backboard; 16 … middle frame bottom panel; 17 … radiator fan; 18 … a pallet; 100 … PCB board; 101 … power output switching circuit; 102 … protection circuit; 103 … first isolated gate driver; 104 … second isolated gate driver; 105 … low voltage protection circuit; 106 … overvoltage protection circuit; 107 … a first differential amplifier; 108 … first pulse edge detection circuit; 109 … a second differential amplifier; 110 … controller; 111 … second pulse edge detection circuit; 112 … power switch; 113 … protect the switch.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described below clearly and completely with reference to the accompanying drawings of the embodiments of the present disclosure.

It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

As shown in fig. 1, fig. 2 and fig. 3, the intelligent high-frequency switching power supply provided by the present invention includes ahousing 1, amiddle frame 15 and a PCB 100 disposed on themiddle frame 15, wherein themiddle frame 15 includes a middleframe side plate 151 disposed opposite to each other and a middleframe back plate 152 connected to the side edges of the two middleframe side plates 151, and further includes a supportingplate 18 horizontally disposed between the two middleframe side plates 151, and the PCB 100 is disposed on the supportingplate 18; the middleframe side plate 151 and the middleframe back plate 152 are made of conductive materials (such as steel plates) and are constructed as faraday cages, thehousing 1 includes abottom plate 11, atop plate 12, aback plate 14 and aU-shaped face shell 13, theback plate 14 is made of conductive materials and is located on one side of the middleframe back plate 152, and is electrically connected with the middleframe back plate 152 and at least provided with twogrounding pins 141 in pair; the PCB board at least deploys the poweroutput switch circuit 101, which includes a power switch 112, a protection switch 113, and aprotection circuit 102. In some embodiments, in consideration of heat dissipation requirements, preferably, themiddle frame 15 further includes a middleframe bottom plate 16 disposed between the two middleframe side plates 151, and aheat dissipation fan 17 is disposed on the middleframe bottom plate 16; anair inlet 131 is formed on the side of theface shell 13 close to the middleframe bottom plate 16, and anair outlet 132 is formed on the side of theface shell 13 close to the supportingplate 18. In order to prevent electric shock, theface housing 13 is preferably made of an insulating material (e.g., engineering plastic).

In the present invention, the power switch 112 includes a first drain, a first source, and a first gate as a first control terminal, wherein the first drain, the first source, and the first gate are not specifically labeled in fig. 3, but can be clearly determined by those skilled in the art according to the circuit diagram. The first control terminal can receive a control signal, which is a first square wave having a first operating frequency, and the power switch 112 can be switched between a conducting state and a non-conducting state according to the control signal. In the present embodiment, the power switch 112 is a gan transistor. The protection switch 113 also includes a second drain, a second source, and a second gate as a second control terminal, wherein the second drain, the second source, and the second gate are not specifically labeled in fig. 3, but can be clearly determined by those skilled in the art according to the circuit diagram. The second control terminal can receive a protection signal, the protection signal is a second square wave with a switching frequency, the protection switch 113 can be switched between a conducting state and a non-conducting state according to the protection signal, a second drain of the protection switch 113 is electrically connected to a second source of the power switch 112, and when the protection switch 113 is switched to the conducting state, the power switch 112 starts to operate. In the present embodiment, the protection switch 113 is an N-channel transistor. Theprotection circuit 102 includes a gate driver (not shown in fig. 3), a voltage detection unit (not shown in fig. 3), a current detection unit (not shown in fig. 3), and acontroller 110. In this embodiment, thecontroller 110 is preferably a single chip microcomputer. The gate driver includes two isolated gate drivers, which are a firstisolated gate driver 103 and a second isolatedgate driver 104. Each isolated gate driver includes an input terminal, an output terminal, and a control terminal. To further explain, the output terminal of the firstisolated gate driver 103 is electrically connected to the control terminal of the power switch 112, and the output terminal of the secondisolated gate driver 104 is electrically connected to the control terminal of the protection switch 113. The voltage detection unit (not specifically labeled in fig. 3) includes a firstdifferential amplifier 107, an over-voltageprotection circuit 106, a low-voltage protection circuit 105, and a second pulseedge detection circuit 111. The input terminal of the firstdifferential amplifier 107 is electrically connected to the output terminal of the firstisolated gate driver 103. The input terminal of the over-voltageprotection circuit 106 is electrically connected to the output terminal of the firstdifferential amplifier 107. The input terminal of the lowvoltage protection circuit 105 is electrically connected to the output terminal of the firstdifferential amplifier 107. The input terminal of the second pulseedge detection circuit 111 is electrically connected to the output terminal of the firstdifferential amplifier 107. The current detection unit (not specifically labeled in fig. 3) includes a second differential amplifier 109 and a second pulseedge detection circuit 111. The input terminal of the second differential amplifier 109 is electrically connected to the source of the protection switch 113. The input terminal of the second pulseedge detection circuit 111 is electrically connected to the output terminal of the second differential amplifier 109. Thecontroller 110 is electrically connected to the control terminal of the firstisolated gate driver 103, the input terminal and the control terminal of the secondisolated gate driver 104, the output terminal of the over-voltageprotection circuit 106, the output terminal of the low-voltage protection circuit 105, the output terminal of the second pulseedge detection circuit 111, the output terminal of the second differential amplifier 109, and the output terminal of the second pulseedge detection circuit 111. The input terminal of the firstisolated gate driver 103 receives the control signal provided from the outside, and transmits the control signal from the output terminal of the firstisolated gate driver 103 to the control terminal of the power switch 112 to control the switching of the power switch 112, and during the transmission of the control signal to the power switch 112, the firstdifferential amplifier 107 collects the control signal and transmits the collected control signal to theovervoltage protection circuit 106, the lowvoltage protection circuit 105, and the second pulseedge detection circuit 111. An overvoltage preset value is pre-stored in theovervoltage protection circuit 106, and when theovervoltage protection circuit 106 receives the collected control signal, a maximum voltage value of the voltage of the control signal is compared with the overvoltage preset value, and a comparison result is transmitted to thecontroller 110. The lowvoltage protection circuit 105 pre-stores a low voltage preset value therein, and when the lowvoltage protection circuit 105 receives the collected control signal, compares a minimum voltage value of the control signal voltage with the low voltage preset value, and transmits the comparison result to thecontroller 110. When the second pulseedge detection circuit 111 receives the acquired control signal, the voltage of the acquired control signal changes from a low potential to a high potential.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.

Claims (7)

1. The intelligent high-frequency switching power supply comprises a shell, a middle frame and a PCB arranged on the middle frame, wherein,

the middle frame comprises middle frame side plates which are arranged in an opposite mode, a middle frame back plate which is connected to the side edges of the two middle frame side plates, and a supporting plate which is horizontally arranged between the two middle frame side plates, wherein the PCB is arranged on the supporting plate; the middle frame side plate and the middle frame back plate are made of conductive materials and are constructed into a Faraday cage, the shell comprises a bottom plate, a top plate, a back plate and a U-shaped face shell, the back plate is made of conductive materials and is positioned on one side of the middle frame back plate, and the back plate is electrically connected with the middle frame back plate and at least provided with two grounding pins in a pair mode;

the PCB is at least provided with a power output switch circuit, the power output switch circuit comprises a power switch, a protection switch and a protection circuit, and the protection circuit comprises a grid driver, a voltage detection unit, a current detection unit and a controller which are electrically connected; the power switch comprises a first drain electrode, a first source electrode and a first gate electrode which is used as a first control end, the protection switch comprises a second drain electrode, a second source electrode and a second gate electrode which is used as a second control end, the second drain electrode of the protection switch is electrically connected with the second source electrode of the power switch, and when the protection switch is switched to be in a conducting state, the power switch starts to work; the grid driver comprises a first isolation type grid driver and a second isolation type grid driver, wherein the first isolation type grid driver and the second isolation type grid driver respectively comprise an input end, an output end and a control end, the output end of the first isolation type grid driver is electrically connected with the control end of the power switch, and the output end of the second isolation type grid driver is electrically connected with the control end of the protection switch.

2. The intelligent high-frequency switching power supply according to claim 1, wherein the middle frame further comprises a middle frame bottom plate disposed between the two middle frame side plates, and a heat dissipation fan is disposed on the middle frame bottom plate; an air inlet is formed in one side, close to the middle frame bottom plate, of the face shell, and an air outlet is formed in one side, close to the supporting plate, of the face shell.

3. The intelligent high-frequency switching power supply according to claim 1, wherein the face shell is made of an insulating material.

4. The intelligent high-frequency switching power supply according to claim 1, wherein the power switch is a gan transistor, and the protection switch is an N-channel transistor.

5. The intelligent high-frequency switching power supply according to claim 1, wherein the voltage detection unit comprises a first differential amplifier, an overvoltage protection circuit, a low-voltage protection circuit and a second pulse edge detection circuit; the input end of the first differential amplifier is electrically connected with the output end of the first isolation type grid driver, the input end of the overvoltage protection circuit is electrically connected with the output end of the first differential amplifier, the input end of the low-voltage protection circuit is electrically connected with the output end of the first differential amplifier, and the input end of the second pulse edge detection circuit is electrically connected with the output end of the first differential amplifier.

6. The intelligent high-frequency switching power supply according to claim 1, wherein the current detection unit comprises a second differential amplifier and a second pulse edge detection circuit, an input terminal of the second differential amplifier is electrically connected to the source of the protection switch, and an input terminal of the second pulse edge detection circuit is electrically connected to an output terminal of the second differential amplifier.

7. The intelligent high-frequency switching power supply according to claim 1, wherein the controller is a single chip microcomputer, and the controller is electrically connected to the control terminal of the first isolated gate driver, the input terminal and the control terminal of the second isolated gate driver 104, the output terminal of the over-voltage protection circuit, the output terminal of the low-voltage protection circuit, the output terminal of the second pulse edge detection circuit, the output terminal of the second differential amplifier, and the output terminal of the second pulse edge detection circuit.

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