CN222339375U

CN222339375U - Power supply switch circuit, power supply circuit and power supply equipment

Info

Publication number: CN222339375U
Application number: CN202323397758.7U
Authority: CN
Inventors: 余生财; 郭修根; 刘棠良
Original assignee: Dongguan Aohai Technology Co ltd
Current assignee: Dongguan Aohai Technology Co ltd
Priority date: 2023-12-12
Filing date: 2023-12-12
Publication date: 2025-01-10
Anticipated expiration: 2033-12-12

Abstract

The utility model discloses a power supply switching circuit, a power supply circuit and power supply equipment. The power supply switching circuit comprises a signal input end, a first output end, a second output end, a first switching circuit and a second switching circuit, wherein the signal input end is used for being connected with a power supply, the first output end and the second output end are used for being connected with electric equipment, when the first output end is connected with the positive electrode of the electric equipment and the second output end is connected with the negative electrode of the electric equipment, the first switching circuit is conducted and the second switching circuit is disconnected, when the first output end is connected with the negative electrode of the electric equipment and the second output end is connected with the positive electrode of the electric equipment, the first switching circuit is disconnected and the second switching circuit is conducted. According to the power supply switching circuit, the first switching circuit and the second switching circuit are arranged, so that the positive and negative polarities of electric equipment can be intelligently identified when the electric equipment is connected, and the corresponding conducting circuit is opened.

Description

Power supply switch circuit, power supply circuit and power supply equipment

Technical Field

The present utility model relates to the field of power supply circuits, and in particular, to a power supply switch circuit, a power supply circuit, and a power supply device.

Background

In the current society, the use of electric energy has been integrated into aspects of life, and some low-voltage electric equipment or electric equipment with an electric storage function need power supply equipment to serve as a bridge for supplying electric energy.

The existing power supply equipment in the current market needs to be distinguished in forward and reverse connection when supplying power for some electric equipment such as batteries and the like. When the electric equipment is connected to the output interface of the power supply equipment, the power supply equipment can supply power normally, and when the electric equipment is connected to the output interface of the power supply equipment in a reverse mode, power cannot be supplied normally, and a power supply circuit inside the power supply equipment can be damaged, so that inconvenience is brought.

Disclosure of utility model

The embodiment of the utility model provides a power supply switching circuit, a power supply circuit and power supply equipment, which are used for solving the problem that the conventional power supply equipment needs to be subjected to forward and reverse connection distinction when power is supplied.

The embodiment of the utility model provides a power supply switching circuit, which comprises a signal input end, a first output end, a second output end, a first switching circuit and a second switching circuit;

The signal input end is used for being connected with a power supply, and the first output end and the second output end are used for being connected with electric equipment;

The first switching circuit comprises a first switching tube and a second switching tube, wherein a first end of the first switching tube is connected with a signal input end, a second end of the first switching tube is connected with a first output end, and a control end of the first switching tube is connected with a second output end;

The second switching circuit comprises a third switching tube and a fourth switching tube, wherein the first end of the third switching tube is connected with the signal input end and the second output end, and the control end of the third switching tube is connected with the first output end;

when the first output end is connected with the positive electrode of the electric equipment and the second output end is connected with the negative electrode of the electric equipment, the first switch circuit is turned on and the second switch circuit is turned off;

When the first output end is connected with the cathode of the electric equipment and the second output end is connected with the anode of the electric equipment, the first switch circuit is disconnected and the second switch circuit is conducted.

Preferably, the first switching tube and the third switching tube are P-MOS tubes, and the second switching tube and the fourth switching tube are N-MOS tubes;

The source electrode of the first switching tube is connected with the signal input end, the drain electrode of the first switching tube is connected with the first output end, and the grid electrode of the first switching tube is connected with the second output end;

The drain electrode of the second switching tube is connected with the second output end, the source electrode of the second switching tube is grounded, and the grid electrode of the second switching tube is connected with the drain electrode of the first switching tube;

The source electrode of the third switching tube is connected with the signal input end, the drain electrode of the third switching tube is connected with the second output end, and the grid electrode of the third switching tube is connected with the first output end;

The drain electrode of the fourth switching tube is connected with the first output end, the source electrode of the fourth switching tube is grounded, and the grid electrode of the fourth switching tube is connected with the drain electrode of the third switching tube;

or the first switching tube and the third switching tube are triodes, and the second switching tube and the fourth switching tube are triodes;

The emitter of the first switching tube is connected with the signal input end, the collector of the first switching tube is connected with the first output end, and the base of the first switching tube is connected with the second output end;

The collector electrode of the second switching tube is connected with the second output end, the emitter electrode of the second switching tube is grounded, and the base electrode of the second switching tube is connected with the collector electrode of the first switching tube;

The emitter of the third switching tube is connected with the signal input end, the collector of the third switching tube is connected with the second output end, and the base of the third switching tube is connected with the first output end;

The collector of the fourth switching tube is connected with the first output end, the emitter of the fourth switching tube is grounded, and the base of the fourth switching tube is connected with the collector of the third switching tube.

Preferably, the first switch circuit further comprises a first resistor and a second resistor, and the second switch circuit further comprises a third resistor and a fourth resistor;

The two ends of the first resistor are respectively connected with the control end and the second output end of the first switching tube;

two ends of the second resistor are respectively connected with the control end and the first output end of the second switching tube;

Two ends of the third resistor are respectively connected with the first output end and the control end of the third switching tube;

And two ends of the fourth resistor are respectively connected with the second output end and the control end of the fourth switching tube.

Preferably, the power supply switch circuit further comprises a first capacitor;

The first end of the first capacitor is connected with the signal input end, and the second end of the first capacitor is grounded.

The embodiment of the utility model also provides a power supply circuit which comprises a transformer module and the power supply switch circuit,

The primary end of the transformer module is used for being connected with a power supply, and the secondary end of the transformer module is connected with the signal input end of the power supply switching circuit;

The power supply switch circuit is also used for being connected with electric equipment, when the first output end is connected with the positive electrode of the electric equipment and the second output end is connected with the negative electrode of the electric equipment, the first switch circuit is turned on and the second switch circuit is turned off, and when the first output end is connected with the negative electrode of the electric equipment and the second output end is connected with the positive electrode of the electric equipment, the first switch circuit is turned off and the second switch circuit is turned on.

Preferably, the power supply circuit further comprises an EMC module, an input end rectifying and filtering module and an output end rectifying and filtering module;

The first end of EMC module is used for connecting the commercial power circuit, the second end of EMC module links to each other with the first end of input rectification filter module, the second end of input rectification filter module links to each other with the primary of transformer module, the secondary of transformer module with the first end of output rectification filter module links to each other, the second end of output rectification filter module with power supply switch circuit's signal input part links to each other.

Preferably, the power supply circuit further comprises a metering module, a remote control switch and an optocoupler Wi-Fi module;

The optocoupler Wi-Fi module comprises a power supply state information transmission circuit, a switch signal receiving circuit and a photoelectric coupling circuit;

The first end of the power supply state information transmission circuit is connected with the metering module, and the second end of the power supply state information transmission circuit is used for being in communication connection with an external terminal and outputting power supply state information to the external terminal;

the first end of the switch signal receiving circuit is in communication connection with the external terminal, the second end of the switch signal receiving circuit is connected with the primary end of the photoelectric coupling circuit, and the secondary end of the photoelectric coupling circuit is connected with the remote control switch;

The switch signal receiving circuit is used for receiving a power supply control signal output by the external terminal and controlling the photoelectric coupling circuit to be conducted according to the power supply control signal, and the remote control switch is used for controlling the transformer module to be connected or disconnected with the input end rectifying and filtering module when the photoelectric coupling circuit is conducted.

Preferably, the power supply circuit further comprises a metering module and a first Wi-Fi module;

the first end of the metering module is connected with the second end of the output end rectifying and filtering module, the second end of the metering module is connected with the signal input end of the power supply switch circuit, and the third end of the metering module is connected with the first Wi-Fi module and is used for outputting power supply state information to the first Wi-Fi module;

the first Wi-Fi module is used for being in communication connection with an external terminal and outputting power supply state information to the external terminal.

Preferably, the power supply circuit further comprises a remote control switch and a second Wi-Fi module;

The second Wi-Fi module is used for being in communication connection with an external terminal, receiving a power supply control signal output by the external terminal and controlling the remote control switch to be turned on or off according to the power supply control signal;

The first end of the remote control switch is connected with the second end of the input end rectifying and filtering module, the second end of the remote control switch is connected with the transformer module, the third end of the remote control switch is connected with the second Wi-Fi module and used for being switched on under the control of the second Wi-Fi module, controlling to switch on the transformer module and the input end rectifying and filtering module, or switching off under the control of the second Wi-Fi module, and controlling to switch off the transformer module and the input end rectifying and filtering module.

The embodiment of the utility model also provides power supply equipment, which comprises the power supply circuit according to any one of the above claims, wherein the input end of the power supply circuit is used for being connected with a power supply, and the output end of the power supply circuit is used for being connected with electric equipment.

According to the power supply switching circuit, the power supply circuit and the power supply equipment provided by the embodiment of the utility model, the first switching circuit and the second switching circuit are arranged in the power supply switching circuit to respectively cope with two access modes of electric equipment, so that positive and negative polarities of the electric equipment can be intelligently identified and corresponding conducting circuits can be opened when the electric equipment is accessed, and a normal power supply loop can be formed when the electric equipment is accessed to the power supply circuit in a positive connection or a reverse connection manner to supply power to the electric equipment.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a power switching circuit according to an embodiment of the present utility model;

FIG. 2 is a block diagram of a power supply circuit according to an embodiment of the utility model.

In the figure, 1, a first switch circuit; 2, a second switch circuit, 3, electric equipment, 4, a transformer module, 5, an EMC module, 6, an input end rectifying and filtering module, 7, an output end rectifying and filtering module, 8, a mains supply circuit, 9, a metering module, 10, a remote control switch, 11, an optocoupler Wi-Fi module, 12, and an external terminal.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be understood that the present utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for the same elements throughout for clarity.

It will be understood that when an element or layer is referred to as being "on," "adjacent," "connected to," or "coupled to" another element or layer, it can be directly on, adjacent, connected, or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present utility model.

Spatially relative terms, such as "under," "below," "beneath," "under," "above," "over," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "below" and "under" may include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.

In the following description, for the purpose of providing a thorough understanding of the present utility model, detailed structures and steps are presented in order to illustrate the technical solution presented by the present utility model. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.

The embodiment of the utility model provides a power supply switching circuit, which comprises a signal input end VIN, a first output end VO1, a second output end VO2, a first switching circuit 1 and a second switching circuit 2; the power supply device comprises a signal input end VIN, a first output end VO1 and a second output end VO2, wherein the signal input end VIN is used for being connected with a power supply, the first output end VO1 and the second output end VO2 are used for being connected with an electric device 3, the first switch circuit 1 comprises a first switch tube Q1 and a second switch tube Q2, the first end of the first switch tube Q1 is connected with the signal input end VIN, the second end of the first switch tube Q1 is connected with the second output end VO2, the first end of the second switch tube Q2 is connected with the second output end VO2, the second end of the second switch tube Q2 is grounded, the control end of the second switch tube Q2 is connected with the second end of the first switch tube Q1, the second switch tube Q2 comprises a third switch tube Q3 and a fourth switch tube Q4, the first end of the third switch tube Q3 is connected with the signal input end VIN and the second output end 2, the control end of the third switch tube Q3 is connected with the first output end VO1, the first end of the fourth switch tube Q4 is connected with the control end of the first output end VO1, the first end of the fourth switch tube Q4 is connected with the electric device Q3, the positive electrode of the second switch tube Q2 is connected with the second output end VO 3 and the negative electrode 3 is connected with the second end of the second output end of the second switch 3, and the positive electrode 3 is connected with the second electrode 3, the positive electrode 3 is connected with the negative electrode 3, and negative electrode 3 is connected with the negative electrode 3.

As an example, the power supply switching circuit may be applied to the output terminals of the power supply circuit, including the signal input terminal VIN, the first output terminal VO1, the second output terminal VO2, the first switching circuit 1, and the second switching circuit 2. The signal input end VIN of the power supply switch circuit may be connected to the output end of the transformer module 4 in the power supply circuit, and receive the power supply voltage signal output by the transformer, and the first output end VO1 and the second output end VO2 of the power supply switch circuit may be connected to the positive and negative electrodes of the electric device 3, respectively, so as to output the power supply voltage signal to the electric device 3. In the power supply switching circuit, the first switching circuit 1 includes a first switching tube Q1 and a second switching tube Q2, and the second switching circuit 2 includes a third switching tube Q3 and a fourth switching tube Q4. The first end of the first switching tube Q1 is connected with the signal input end VIN, the second end of the first switching tube Q1 is connected with the first output end VO1, the control end of the first switching tube Q1 is connected with the second output end VO2, the first end of the second switching tube Q2 is connected with the second output end VO2, the second end of the second switching tube Q2 is grounded, the control end of the second switching tube Q2 is connected with the second end of the first switching tube Q1, the first end of the third switching tube Q3 is connected with the signal input end VIN and the second output end VO2, the control end of the third switching tube Q3 is connected with the first output end VO1, the first end of the fourth switching tube Q4 is connected with the first output end VO1, the second end of the fourth switching tube Q4 is grounded, and the control end of the fourth switching tube Q4 is connected with the second end of the third switching tube Q3.

When the electric equipment 3 is connected into the power supply switching circuit, if the positive electrode of the electric equipment 3 is connected with the first output end VO1 and the negative electrode is connected with the second output end VO2, a first switching tube Q1 in the power supply switching circuit is conducted, a third switching tube Q3 is cut off, the first switching tube Q1 controls the second switching tube Q2 to be conducted, and then a power supply voltage signal output by the first switching circuit 1 sequentially passes through the first output end VO1, the positive electrode of the electric equipment 3, the negative electrode of the electric equipment 3 and the second output end VO2 to form a power supply loop, and if the positive electrode of the electric equipment 3 is connected with the second output end VO2 and the negative electrode of the electric equipment 3 is connected with the first output end VO1, a third switching tube Q3 in the power supply switching circuit is conducted, the first switching tube Q1 is cut off, the third switching tube Q3 controls the fourth switching tube Q4 to be conducted, and further the power supply voltage signal output by the second switching circuit 2 sequentially passes through the second output end 2, the positive electrode of the electric equipment 3 and the negative electrode of the electric equipment 3 and the first output end VO1 to form the power supply loop.

In this example, by setting the first switch circuit 1 and the second switch circuit 2 in the power supply switch circuit, two access modes of the electric equipment 3 are respectively dealt with, so that the positive and negative polarities of the electric equipment 3 can be intelligently identified and the corresponding conducting circuit can be opened to form a normal power supply loop.

In an embodiment, the first switching tube Q1 and the third switching tube Q3 are P-MOS tubes, the second switching tube Q2 and the fourth switching tube Q4 are N-MOS tubes, the source electrode of the first switching tube Q1 is connected to the signal input end VIN, the drain electrode of the first switching tube Q1 is connected to the first output end VO1, the gate electrode of the first switching tube Q1 is connected to the second output end VO2, the drain electrode of the second switching tube Q2 is connected to the second output end VO2, the source electrode of the second switching tube Q2 is grounded, the gate electrode of the second switching tube Q2 is connected to the drain electrode of the first switching tube Q1, the source electrode of the third switching tube Q3 is connected to the signal input end VIN, the drain electrode of the third switching tube Q3 is connected to the second output end VO2, the gate electrode of the fourth switching tube Q4 is connected to the first output end VO1, the source electrode of the fourth switching tube Q4 is grounded, and the gate electrode of the fourth switching tube Q4 is connected to the drain electrode of the fourth switching tube Q3.

As an example, when the first switching tube Q1 and the third switching tube Q3 are P-MOS tubes, the second switching tube Q2 and the fourth switching tube Q4 are N-MOS tubes, as shown in fig. 1, the source electrode of the first switching tube Q1 is connected to the signal input terminal VIN, the drain electrode of the first switching tube Q1 is connected to the first output terminal VO1, the gate electrode of the first switching tube Q1 is connected to the second output terminal VO2, the drain electrode of the second switching tube Q2 is connected to the second output terminal VO2, the source electrode of the second switching tube Q2 is grounded, the gate electrode of the second switching tube Q2 is connected to the drain electrode of the first switching tube Q1, the source electrode of the third switching tube Q3 is connected to the signal input terminal VIN, the drain electrode of the third switching tube Q3 is connected to the second output terminal VIN, the gate electrode of the third switching tube Q3 is connected to the first output terminal VO1, the drain electrode of the fourth switching tube Q4 is connected to the first output terminal VO1, and the source electrode of the fourth switching tube Q4 is grounded.

When the positive electrode of the electric device 3 is connected with the first output end VO1, the negative electrode of the electric device 3 is connected with the second output end VO2, at the moment, the grid voltage of the third switching tube Q3 is higher than the source voltage, the third switching tube Q3 is cut off, the source voltage of the first switching tube Q1 is higher than the grid voltage, the first switching tube Q1 is conducted, the grid voltage of the second switching tube Q2 is higher than the starting voltage of the second switching tube Q2, the second switching tube Q2 is conducted along with the first switching tube Q1, and then a power supply voltage signal output through the first switching circuit 1 sequentially passes through the first output end VO1, the positive electrode of the electric device 3, the negative electrode of the electric device 3 and the second output end VO2 to form a power supply loop.

When the positive electrode of the electric device 3 is connected with the second output end VO2, the negative electrode of the electric device 3 is connected with the first output end VO1, at the moment, the grid voltage of the first switch tube Q1 is higher than the source voltage, the first switch tube Q1 is cut off, the source voltage of the third switch tube Q3 is higher than the grid voltage, the third switch tube Q3 is conducted, the grid voltage of the fourth switch tube Q4 is higher than the opening voltage of the fourth switch tube Q4, the fourth switch tube Q4 is conducted along with the opening voltage, and then a power supply voltage signal output through the second switch circuit 2 sequentially passes through the second output end VO2, the positive electrode of the electric device 3, the negative electrode of the electric device 3 and the first output end VO1 to form a power supply loop.

In another embodiment, the first switching tube Q1 and the third switching tube Q3 are PNP transistors, the second control tube and the fourth switching tube Q4 are NPN transistors, the emitter of the first switching tube Q1 is connected to the signal input terminal VIN, the collector of the first switching tube Q1 is connected to the first output terminal VO1, the base of the first switching tube Q1 is connected to the second output terminal VO2, the collector of the second switching tube Q2 is connected to the second output terminal VO2, the emitter of the second switching tube Q2 is grounded, the base of the second switching tube Q2 is connected to the collector of the third switching tube Q3, the emitter of the third switching tube Q3 is connected to the signal input terminal VIN, the collector of the third switching tube Q3 is connected to the second output terminal VO2, the base of the third switching tube Q3 is connected to the first output terminal VO1, the collector of the fourth switching tube Q4 is connected to the first output terminal VO1, and the emitter of the fourth switching tube Q4 is grounded, and the base of the fourth switching tube Q4 is connected to the collector of the third switching tube Q3.

As another example, when the first switching tube Q1 and the third switching tube Q3 are PNP transistors and the second control tube and the fourth switching tube Q4 are NPN transistors, the emitter of the first switching tube Q1 is connected to the signal input terminal VIN, the collector of the first switching tube Q1 is connected to the first output terminal VO1, the base of the first switching tube Q1 is connected to the second output terminal VO2, the collector of the second switching tube Q2 is connected to the second output terminal VO2, the emitter of the second switching tube Q2 is grounded, the base of the second switching tube Q2 is connected to the collector of the third switching tube Q3, the emitter of the third switching tube Q3 is connected to the signal input terminal VIN, the collector of the third switching tube Q3 is connected to the second output terminal VO2, the base of the third switching tube Q3 is connected to the first output terminal VO1, the collector of the fourth switching tube Q4 is connected to the first output terminal VO1, and the emitter of the fourth switching tube Q4 is grounded, and the base of the fourth switching tube Q4 is connected to the collector of the third switching tube Q3.

When the positive electrode of the electric equipment 3 is connected with the first output end VO1, the negative electrode of the electric equipment 3 is connected with the second output end VO2, at the moment, the base voltage of the third switching tube Q3 is higher than the emitter voltage, the third switching tube Q3 is cut off, the emitter voltage of the first switching tube Q1 is higher than the base voltage, the first switching tube Q1 is conducted, the base voltage of the second switching tube Q2 is higher than the starting voltage of the second switching tube Q2, the second switching tube Q2 is conducted along with the starting voltage, and then a power supply voltage signal output by the first switching circuit 1 sequentially passes through the first output end VO1, the positive electrode of the electric equipment 3, the negative electrode of the electric equipment 3 and the second output end VO2 to form a power supply loop.

When the positive electrode of the electric device 3 is connected with the second output end VO2, the negative electrode of the electric device 3 is connected with the first output end VO1, at the moment, the base voltage of the first switch tube Q1 is higher than the emitter voltage, the first switch tube Q1 is cut off, the emitter voltage of the third switch tube Q3 is higher than the base voltage, the third switch tube Q3 is conducted, the base voltage of the fourth switch tube Q4 is higher than the starting voltage of the fourth switch tube Q4, the fourth switch tube Q4 is conducted along with the starting voltage, and then a power supply voltage signal output by the second switch circuit 2 sequentially passes through the second output end VO2, the positive electrode of the electric device 3, the negative electrode of the electric device 3 and the first output end VO1 to form a power supply loop.

In an embodiment, the first switch circuit 1 further includes a first resistor R1 and a second resistor R2, the second switch circuit 2 further includes a third resistor R3 and a fourth resistor R4, two ends of the first resistor R1 are respectively connected with a control end of the first switch tube Q1 and the second output end VO2, two ends of the second resistor R2 are respectively connected with a control end of the second switch tube Q2 and the first output end VO1, two ends of the third resistor R3 are respectively connected with the first output end VO1 and a control end of the third switch tube Q3, and two ends of the fourth resistor R4 are respectively connected with the second output end VO2 and a control end of the fourth switch tube Q4.

As an example, the first switching circuit 1 further includes a first resistor R1 and a second resistor R2, the second switching circuit 2 further includes a third resistor R3 and a fourth resistor R4, and two ends of the first resistor R1 are respectively connected to the control end of the first switching tube Q1 and the second output end VO2, so as to provide an on voltage for the first switching tube Q1. Two ends of the second resistor R2 are respectively connected with the control end of the second switching tube Q2 and the first output end VO1, and are used for providing an opening voltage for the second switching tube Q2. The two ends of the third resistor R3 are respectively connected to the first output terminal VO1 and the control terminal of the third switching tube Q3, and are used for providing an on voltage for the third switching tube Q3. The two ends of the fourth resistor R4 are respectively connected to the second output terminal VO2 and the control terminal of the fourth switching tube Q4, and are used for providing the turn-on voltage for the fourth switching tube Q4.

In one embodiment, the power supply switch circuit further includes a first capacitor C1, wherein a first end of the first capacitor C1 is connected to the signal input terminal VIN, and a second end of the first capacitor C1 is grounded.

As an example, the power supply switching circuit further comprises a first capacitor C1. The first end of the first capacitor C1 is connected with the signal input end VIN, and the second end of the first capacitor C1 is grounded and used for filtering alternating current components in the power supply voltage signal, so that the functions of energy storage and voltage stabilization are achieved.

The embodiment of the utility model also provides a power supply circuit which comprises a transformer module 4 and the power supply switching circuit in any embodiment, wherein the primary end of the transformer module 4 is used for being connected with a power supply, the secondary end of the transformer module 4 is connected with a signal input end VIN of the power supply switching circuit, the power supply switching circuit is also used for being connected with electric equipment 3, when a first output end VO1 is connected with the positive electrode of the electric equipment 3 and a second output end VO2 is connected with the negative electrode of the electric equipment 3, the first switching circuit 1 is conducted and the second switching circuit 2 is disconnected, when the first output end VO1 is connected with the negative electrode of the electric equipment 3 and the second output end VO2 is connected with the positive electrode of the electric equipment 3, the first switching circuit 1 is disconnected and the second switching circuit 2 is conducted.

As an example, the power supply circuit includes the transformer module 4 and the power supply switching circuit in any of the foregoing examples, where the primary side of the transformer module 4 is used to connect to a power supply, and the power supply may be a direct current power supply or a mains circuit 8. The secondary side of the transformer module 4 is connected to the signal input VIN of the power supply switching circuit, and outputs a power supply voltage signal to the power supply switching circuit. When the electric equipment 3 is connected into the power supply switching circuit, if the positive electrode of the electric equipment 3 is connected with the first output end VO1 and the negative electrode is connected with the second output end VO2, a first switching tube Q1 in the power supply switching circuit is conducted, a third switching tube Q3 is cut off, the first switching tube Q1 controls the second switching tube Q2 to be conducted, and then a power supply voltage signal output by the first switching circuit 1 sequentially passes through the first output end VO1, the positive electrode of the electric equipment 3, the negative electrode of the electric equipment 3 and the second output end VO2 to form a power supply loop, and if the positive electrode of the electric equipment 3 is connected with the second output end VO2 and the negative electrode of the electric equipment 3 is connected with the first output end VO1, a third switching tube Q3 in the power supply switching circuit is conducted, the first switching tube Q1 is cut off, the third switching tube Q3 controls the fourth switching tube Q4 to be conducted, and further the power supply voltage signal output by the second switching circuit 2 sequentially passes through the second output end 2, the positive electrode of the electric equipment 3 and the negative electrode of the electric equipment 3 and the first output end VO1 to form the power supply loop.

In this example, by setting the first switch circuit 1 and the second switch circuit 2 in the power supply switch circuit, two access modes of the electric equipment 3 are respectively dealt with, so that the positive and negative polarities of the electric equipment 3 can be intelligently identified and the corresponding conducting circuit can be opened, and when the electric equipment 3 is connected to the power supply circuit in a positive or reverse way, a normal power supply loop can be formed to supply power to the electric equipment 3.

In an embodiment, the power supply circuit further includes an EMC module 5, an input rectifying and filtering module 6 and an output rectifying and filtering module 7, where a first end of the EMC module 5 is connected to the mains circuit 8, a second end of the EMC module 5 is connected to a first end of the input rectifying and filtering module 6, a second end of the input rectifying and filtering module 6 is connected to a primary end of the transformer module 4, a secondary end of the transformer module 4 is connected to a first end of the output rectifying and filtering module 7, and a second end of the output rectifying and filtering module 7 is connected to a signal input VIN of the power supply switch circuit.

As an example, the power supply circuit further includes an EMC module 5, an input rectifying and filtering module 6 and an output rectifying and filtering module 7, where a first end of the EMC module 5 is connected to the mains circuit 8, and a second end of the EMC module 5 is connected to the first end of the input rectifying and filtering module 6, so as to prevent external electromagnetic interference from affecting devices in the power supply circuit, and also prevent the devices in the circuit from generating electromagnetic interference to the power grid. The second end of the input end rectifying and filtering module 6 is connected with the primary end of the transformer module 4 and is used for rectifying and filtering the input mains voltage, the first end of the output end rectifying and filtering module 7 is connected with the secondary end of the transformer module 4, the second end of the output end rectifying and filtering module 7 is connected with the signal input end VIN of the power supply switching circuit and is used for synchronously tidying and filtering the voltage output by the transformer module 4, so that the output power supply voltage signal is smoother.

In an embodiment, the power supply circuit further comprises a metering module 9, a remote control switch 10 and an optocoupler Wi-Fi module 11, the optocoupler Wi-Fi module 11 comprises a power supply state information transmission circuit, a switch signal receiving circuit and a photoelectric coupling circuit, a first end of the power supply state information transmission circuit is connected with the metering module 9, a second end of the power supply state information transmission circuit is used for being in communication connection with an external terminal 12 and outputting power supply state information to the external terminal 12, a first end of the switch signal receiving circuit is in communication connection with the external terminal 12, a second end of the switch signal receiving circuit is connected with a primary end of the photoelectric coupling circuit, a secondary end of the photoelectric coupling circuit is connected with the remote control switch 10, the switch signal receiving circuit is used for receiving a power supply control signal output by the external terminal 12 and controlling the photoelectric coupling circuit to be conducted according to the power supply control signal, and the remote control switch 10 is used for controlling the transformer module 4 to be connected with or disconnected from the input end rectifying and filtering module 6 when the photoelectric coupling circuit is conducted.

As an example, the power supply circuit further comprises a metering module 9, a remote control switch 10 and an optocoupler Wi-Fi module 11. The optocoupler Wi-Fi module 11 includes a power supply state information transmission circuit, a switching signal receiving circuit, and a photocoupling circuit. The first end of the power supply state information transmission circuit is connected with the metering module 9, and the second end of the power supply state information transmission circuit is used for being in communication connection with the external terminal 12. The metering module 9 may include a temperature detection unit, a current detection unit, a voltage detection unit, a power detection unit, and the like, detect current temperature, current, voltage, power, and other power supply state information of the power supply circuit in real time, and report the detected power supply state information to the optocoupler Wi-Fi module 11 through a power supply state information transmission circuit. The optocoupler Wi-Fi module 11 is in communication connection with the external terminal 12, and can output the received power supply state information to the external terminal 12. The first end of the switching signal receiving circuit is in communication connection with the external terminal 12, the second end of the switching signal receiving circuit is connected with the primary end of the photoelectric coupling circuit, and the secondary end of the photoelectric coupling circuit is connected with the remote control switch 10. The switch signal receiving circuit is used for controlling and conducting the photoelectric coupling circuit according to the power supply control signal output by the external terminal 12 and controlling the switch 10 to be used for controlling the transformer module 4 to be connected or disconnected with the input end rectifying and filtering module 6 when the photoelectric coupling circuit is conducted. In this example, by providing the photoelectric coupling circuit, the metering module 9 and the remote control switch 10 can be isolated, and the phenomenon of sharing the primary and secondary of the transformer can be prevented.

In an embodiment, the power supply circuit further comprises a metering module 9 and a first Wi-Fi module, wherein a first end of the metering module 9 is connected with a second end of the output end rectifying and filtering module 7, a second end of the metering module 9 is connected with a signal input end of the power supply switch circuit, a third end of the metering module 9 is connected with the first Wi-Fi module and is used for outputting power supply state information to the first Wi-Fi module, and the first Wi-Fi module is used for being in communication connection with the external terminal 12 and outputting power supply state information to the external terminal 12.

As an example, the power supply circuit further comprises a metering module 9 and a first Wi-Fi module. The first end of the metering module 9 is connected with the second end of the output end rectifying and filtering module 7, the second end of the metering module 9 is connected with the signal input end of the power supply switching circuit, and the third end of the metering module 9 is connected with the first Wi-Fi module. The metering module 9 may include a temperature detecting unit, a current detecting unit, a voltage detecting unit, a power detecting unit, and the like, detect current temperature, current, voltage, power, and other power supply status information of the power supply circuit in real time, and report the detected power supply status information to the first Wi-Fi module. The first Wi-Fi module is communicatively connected to the external terminal 12, and can output the received power supply status information to the external terminal 12.

In an embodiment, the power supply circuit further includes a remote control switch 10 and a second Wi-Fi module, where the second Wi-Fi module is in communication connection with the external terminal 12, receives a power supply control signal output by the external terminal 12, and controls to turn on or off the remote control switch 10 according to the power supply control signal, a first end of the remote control switch 10 is connected to a second end of the input rectifying and filtering module 6, a second end of the remote control switch 10 is connected to the transformer module 4, a third end of the remote control switch 10 is connected to the second Wi-Fi module, and is used to turn on under control of the second Wi-Fi module, control to turn on the transformer module 4 and the input rectifying and filtering module 6, or turn off under control of the second Wi-Fi module, and control to turn off the transformer module 4 and the input rectifying and filtering module 6.

As an example, the power supply circuit further comprises a remote control switch 10 and a second Wi-Fi module. The first end of the remote control switch 10 is connected with the second end of the input end rectifying and filtering module 6, the second end of the remote control switch 10 is connected with the transformer module 4, the third end of the remote control switch 10 is connected with the second Wi-Fi module, and the second Wi-Fi module is in communication connection with the external terminal 12. In the working process of the circuit, the second Wi-Fi module is communicated with the external terminal 12, the remote control switch 10 is controlled to be turned on according to the requirement of the external terminal 12, so that the transformer module 4 is turned on the input end rectifying and filtering module 6, the power supply circuit can output a power supply voltage signal, or the remote control switch 10 is controlled to be turned off according to the requirement of the external terminal 12, so that the transformer module 4 is turned off the input end rectifying and filtering module 6, and the power supply circuit cannot output the power supply voltage signal.

The embodiment of the utility model also provides power supply equipment, which comprises a shell and the power supply circuit in the embodiment, wherein the input end of the power supply circuit is used for being connected with the mains supply circuit 8, and the output end of the power supply circuit is used for being connected with the electric equipment 3.

As an example, the power supply device includes the power supply circuit in the above example, where an input end of the power supply circuit is used to connect to a power supply, and the power supply may be a direct current power supply or a commercial power circuit 8, and an output end of the power supply circuit is used to connect to the electric device 3.

The foregoing embodiments are merely illustrative of the technical solutions of the present utility model, and not restrictive, and although the present utility model has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that modifications may still be made to the technical solutions described in the foregoing embodiments or equivalent substitutions of some technical features thereof, and that such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. The power supply switching circuit is characterized by comprising a signal input end, a first output end, a second output end, a first switching circuit and a second switching circuit;

2. The power supply switching circuit according to claim 1, wherein the first switching tube and the third switching tube are P-MOS tubes, and the second switching tube and the fourth switching tube are N-MOS tubes;

3. The power switching circuit of claim 1, wherein the first switching circuit further comprises a first resistor and a second resistor, the second switching circuit further comprising a third resistor and a fourth resistor;

4. The power switching circuit of claim 1, wherein the power switching circuit further comprises a first capacitor;

5. A power supply circuit comprising a transformer module and a power supply switching circuit as claimed in any one of claims 1 to 4,

6. The power supply circuit of claim 5, further comprising an EMC module, an input rectifier filter module, and an output rectifier filter module;

7. The power supply circuit of claim 6, further comprising a metering module, a remote control switch, and an optocoupler Wi-Fi module;

8. The power supply circuit of claim 6, further comprising a metering module and a first Wi-Fi module;

9. The power supply circuit of claim 6, further comprising a remote control switch and a second Wi-Fi module;

10. A power supply device, characterized by comprising the power supply circuit according to any one of claims 5-9, an input of the power supply circuit being adapted to be connected to a power supply, and an output of the power supply circuit being adapted to be connected to a consumer.