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

Abstract

The utility model discloses a power supply switch 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, 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; 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 switched on and the second switching circuit is switched off; 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 switched off and the second switching circuit is switched on. According to the power supply switch circuit, the first switch circuit and the second switch circuit are arranged, so that the positive and negative polarities of the electric equipment when the electric equipment is connected can be intelligently identified, and the corresponding conduction circuit is switched on.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply circuits, and in particular to a power supply switch circuit, a power supply circuit and a power supply device. Background Art

[0002] In today's society, the use of electric energy has been integrated into all aspects of life. Some low-voltage electrical equipment or electrical equipment with power storage function requires power supply equipment to act as a bridge to provide electric energy.

[0003] At present, the existing power supply equipment on the market needs to distinguish between positive and negative connection when supplying power to some power-consuming devices such as batteries. When the power-consuming device is connected to the output interface of the power supply device in the positive direction, the power supply device can supply power normally, but when the power-consuming device is connected to the output interface of the power supply device in the reverse direction, not only can the power supply not be normal, but the power supply circuit inside the power supply device may also be damaged, which brings inconvenience. Utility Model Content

[0004] The embodiments of the utility model provide a power supply switch circuit, a power supply circuit and a power supply device to solve the problem that the existing power supply device needs to distinguish between positive and reverse connection when supplying power.

[0005] The embodiment of the utility model provides a power supply switch circuit, including a signal input terminal, a first output terminal, a second output terminal, a first switch circuit and a second switch circuit;

[0006] The signal input end is used to connect to a power supply, and the first output end and the second output end are used to connect to an electrical device;

[0007] The first switch circuit includes a first switch tube and a second switch tube; the first end of the first switch tube is connected to the signal input end, the second end of the first switch tube is connected to the first output end, and the control end of the first switch tube is connected to the second output end; the first end of the second switch tube is connected to the second output end, the second end of the second switch tube is grounded, and the control end of the second switch tube is connected to the second end of the first switch tube;

[0008] The second switch circuit includes a third switch tube and a fourth switch tube; the first end of the third switch tube is connected to the signal input end and the second output end, and the control end of the third switch tube is connected to the first output end; the first end of the fourth switch tube is connected to the first output end, the second end of the fourth switch tube is grounded, and the control end of the fourth switch tube is connected to the second end of the third switch tube;

[0009] When the first output terminal is connected to the positive electrode of the electric device, and the second output terminal is connected to the negative electrode of the electric device, the first switch circuit is turned on and the second switch circuit is turned off;

[0010] When the first output end is connected to the negative electrode of the electric device and the second output end is connected to the positive electrode of the electric device, the first switch circuit is disconnected and the second switch circuit is turned on.

[0011] Preferably, the first switch tube and the third switch tube are P-MOS tubes, and the second switch tube and the fourth switch tube are N-MOS tubes;

[0012] The source of the first switch tube is connected to the signal input terminal, the drain of the first switch tube is connected to the first output terminal, and the gate of the first switch tube is connected to the second output terminal;

[0013] The drain of the second switch tube is connected to the second output terminal, the source of the second switch tube is grounded, and the gate of the second switch tube is connected to the drain of the first switch tube;

[0014] The source of the third switch tube is connected to the signal input terminal, the drain of the third switch tube is connected to the second output terminal, and the gate of the third switch tube is connected to the first output terminal;

[0015] The drain of the fourth switch tube is connected to the first output end, the source of the fourth switch tube is grounded, and the gate of the fourth switch tube is connected to the drain of the third switch tube;

[0016] Alternatively, the first switch tube and the third switch tube are triodes, and the second switch tube and the fourth switch tube are triodes;

[0017] The emitter of the first switch tube is connected to the signal input terminal, the collector of the first switch tube is connected to the first output terminal, and the base of the first switch tube is connected to the second output terminal;

[0018] The collector of the second switch tube is connected to the second output terminal, the emitter of the second switch tube is grounded, and the base of the second switch tube is connected to the collector of the first switch tube;

[0019] The emitter of the third switch tube is connected to the signal input terminal, the collector of the third switch tube is connected to the second output terminal, and the base of the third switch tube is connected to the first output terminal;

[0020] The collector of the fourth switch tube is connected to the first output end, the emitter of the fourth switch tube is grounded, and the base of the fourth switch tube is connected to the collector of the third switch tube.

[0021] Preferably, the first switch circuit further includes a first resistor and a second resistor, and the second switch circuit further includes a third resistor and a fourth resistor;

[0022] Two ends of the first resistor are respectively connected to the control end of the first switch tube and the second output end;

[0023] Two ends of the second resistor are respectively connected to the control end of the second switch tube and the first output end;

[0024] Two ends of the third resistor are respectively connected to the first output end and the control end of the third switch tube;

[0025] Two ends of the fourth resistor are connected to the second output end and the control end of the fourth switch tube respectively.

[0026] Preferably, the power switch circuit further includes a first capacitor;

[0027] A first end of the first capacitor is connected to the signal input end, and a second end of the first capacitor is grounded.

[0028] The embodiment of the utility model further provides a power supply circuit, comprising a transformer module and any one of the power supply switch circuits described above,

[0029] The primary end of the transformer module is used to connect to a power supply, and the secondary end of the transformer module is connected to a signal input end of the power switch circuit;

[0030] The power supply switch circuit is also used to be connected to an electrical device. When the first output end is connected to the positive pole of the electrical device and the second output end is connected to the negative pole of the electrical device, the first switch circuit is turned on and the second switch circuit is turned off; when the first output end is connected to the negative pole of the electrical device and the second output end is connected to the positive pole of the electrical device, the first switch circuit is turned off and the second switch circuit is turned on.

[0031] Preferably, the power supply circuit further includes an EMC module, an input-end rectifying and filtering module, and an output-end rectifying and filtering module;

[0032] The first end of the EMC module is used to connect to the mains circuit, the second end of the EMC module is connected to the first end of the input rectifier and filter module, the second end of the input rectifier and filter module is connected to the primary end of the transformer module, the secondary end of the transformer module is connected to the first end of the output rectifier and filter module, and the second end of the output rectifier and filter module is connected to the signal input end of the power supply switch circuit.

[0033] Preferably, the power supply circuit further includes a metering module, a remote control switch and an optical coupler Wi-Fi module;

[0034] The optical coupler Wi-Fi module includes a power supply status information transmission circuit, a switch signal receiving circuit and a photoelectric coupling circuit;

[0035] The first end of the power supply status information transmission circuit is connected to the metering module, and the second end of the power supply status information transmission circuit is used to communicate with an external terminal and output power supply status information to the external terminal;

[0036] The first end of the switch signal receiving circuit is communicatively connected to the external terminal, the second end of the switch signal receiving circuit is connected to the primary end of the photoelectric coupling circuit, and the secondary end of the photoelectric coupling circuit is connected to the remote control switch;

[0037] The switch signal receiving circuit is used to receive the power supply control signal output by the external terminal, and control the conduction of the photoelectric coupling circuit according to the power supply control signal. The remote control switch is used to control the transformer module to connect or disconnect the input-end rectifier and filter module when the photoelectric coupling circuit is turned on.

[0038] Preferably, the power supply circuit further includes a metering module and a first Wi-Fi module;

[0039] The first end of the metering module is connected to the second end of the output-end rectifying and filtering module, the second end of the metering module is connected to the signal input end of the power supply switch circuit, and the third end of the metering module is connected to the first Wi-Fi module, for outputting power supply status information to the first Wi-Fi module;

[0040] The first Wi-Fi module is used to communicate with an external terminal and output power supply status information to the external terminal.

[0041] Preferably, the power supply circuit further comprises a remote control switch and a second Wi-Fi module;

[0042] The second Wi-Fi module is used to communicate with the external terminal, receive the power supply control signal output by the external terminal, and control the remote control switch to be turned on or off according to the power supply control signal;

[0043] The first end of the remote control switch is connected to the second end of the input-end rectifying and filtering module, the second end of the remote control switch is connected to the transformer module, and the third end of the remote control switch is connected to the second Wi-Fi module, and is used to be turned on under the control of the second Wi-Fi module to control the connection of the transformer module and the input-end rectifying and filtering module, or to be turned off under the control of the second Wi-Fi module to control the disconnection of the transformer module and the input-end rectifying and filtering module.

[0044] An embodiment of the utility model further provides a power supply device, comprising the power supply circuit as described in any one of the above claims, wherein the input end of the power supply circuit is used to connect to a power supply source, and the output end of the power supply circuit is used to connect to an electrical device.

[0045] The power supply switch circuit, power supply circuit and power supply equipment provided by the embodiments of the utility model respectively respond to two access modes of the electrical equipment by setting a first switch circuit and a second switch circuit in the power supply switch circuit. The positive and negative polarities of the electrical equipment when connected can be intelligently identified and the corresponding conduction circuit can be opened. When the electrical equipment is connected to the power supply circuit in the forward direction or in the reverse direction, a normal power supply circuit can be formed to supply power to the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0047] Figure 1 This is a circuit diagram of a power supply switch circuit in one embodiment of the utility model;

[0048] Figure 2 It is a block diagram schematic diagram of a power supply circuit in one embodiment of the utility model.

[0049] In the figure: 1. First switch circuit; 2. Second switch circuit; 3. Electrical equipment; 4. Transformer module; 5. EMC module; 6. Input rectifier and filter module; 7. Output rectifier and filter module; 8. AC power circuit; 9. Metering module; 10. Remote control switch; 11. Optocoupler Wi-Fi module; 12. External terminal. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0051] It should be understood that the utility model can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and fully convey the scope of the utility model to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0052] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. On the contrary, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0053] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under it" or "under it" will be oriented as "on" the other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0054] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be a limitation of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising" when used in this specification determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0055] In order to thoroughly understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0056] The utility model embodiment provides a power supply switch circuit, including a signal input terminal VIN, a first output terminal VO1, a second output terminal VO2, a first switch circuit 1 and a second switch circuit 2; the signal input terminal VIN is used to connect a power supply, and the first output terminal VO1 and the second output terminal VO2 are used to connect an electrical device 3; the first switch circuit 1 includes a first switch tube Q1 and a second switch tube Q2; the first end of the first switch tube Q1 is connected to the signal input terminal VIN, the second end of the first switch tube Q1 is connected to the first output terminal VO1, and the control end of the first switch tube Q1 is connected to the second output terminal VO2; the first end of the second switch tube Q2 is connected to the second output terminal VO2, the second end of the second switch tube Q2 is grounded, and the control end of the second switch tube Q2 is connected to the second end of the first switch tube Q1; the second The switch circuit 2 includes a third switch tube Q3 and a fourth switch tube Q4; the first end of the third switch tube Q3 is connected to the signal input end VIN and the second output end VO2, and the control end of the third switch tube Q3 is connected to the first output end VO1; the first end of the fourth switch tube Q4 is connected to the first output end VO1, the second end of the fourth switch tube Q4 is grounded, and the control end of the fourth switch tube Q4 is connected to the second end of the third switch tube Q3; when the first output end VO1 is connected to the positive electrode of the electrical equipment 3, and the second output end VO2 is connected to the negative electrode of the electrical equipment 3, the first switch circuit 1 is turned on and the second switch circuit 2 is turned off; when the first output end VO1 is connected to the negative electrode of the electrical equipment 3, and the second output end VO2 is connected to the positive electrode of the electrical equipment 3, the first switch circuit 1 is turned off and the second switch circuit 2 is turned on.

[0057] As an example, the power supply switch circuit can be applied to the output end of the power supply circuit, including a signal input end VIN, a first output end VO1, a second output end VO2, a first switch circuit 1, and a second switch circuit 2. The signal input end VIN of the power supply switch circuit can be connected to the output end of the transformer module 4 in the power supply circuit to 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 can be connected to the positive and negative poles of the power-consuming device 3, respectively, to output the power supply voltage signal to the power-consuming device 3. In the power supply switch circuit, the first switch circuit 1 includes a first switch tube Q1 and a second switch tube Q2, and the second switch circuit 2 includes a third switch tube Q3 and a fourth switch tube Q4. A first end of the first switch tube Q1 is connected to the signal input end VIN, a second end of the first switch tube Q1 is connected to the first output end VO1, and a control end of the first switch tube Q1 is connected to the second output end VO2; a first end of the second switch tube Q2 is connected to the second output end VO2, a second end of the second switch tube Q2 is grounded, and a control end of the second switch tube Q2 is connected to the second end of the first switch tube Q1; a first end of the third switch tube Q3 is connected to the signal input end VIN and the second output end VO2, and a control end of the third switch tube Q3 is connected to the first output end VO1; a first end of the fourth switch tube Q4 is connected to the first output end VO1, a second end of the fourth switch tube Q4 is grounded, and a control end of the fourth switch tube Q4 is connected to the second end of the third switch tube Q3.

[0058] When the electric device 3 is connected to the power supply switch circuit, if the positive electrode of the electric device 3 is connected to the first output terminal VO1 and the negative electrode is connected to the second output terminal VO2, the first switch tube Q1 in the power supply switch circuit is turned on, the third switch tube Q3 is turned off, and the first switch tube Q1 controls the second switch tube Q2 to be turned on, so that the power supply voltage signal output by the first switch circuit 1 passes through the first output terminal VO1, the positive electrode of the electric device 3, the negative electrode of the electric device 3 and the second output terminal VO2 in sequence to form a power supply loop; if the positive electrode of the electric device 3 is connected to the second output terminal VO2 and the negative electrode is connected to the first output terminal VO1, the third switch tube Q3 in the power supply switch circuit is turned on, the first switch tube Q1 is turned off, and the third switch tube Q3 controls the fourth switch tube Q4 to be turned on, so that the power supply voltage signal output by the second switch circuit 2 passes through the second output terminal VO2, the positive electrode of the electric device 3, the negative electrode of the electric device 3 and the first output terminal VO1 in sequence to form a power supply loop.

[0059] In this example, by setting the first switch circuit 1 and the second switch circuit 2 in the power supply switch circuit, the two access modes of the electrical equipment 3 can be responded to respectively. The positive and negative polarities of the electrical equipment 3 when connected can be intelligently identified and the corresponding conduction circuit can be opened to form a normal power supply circuit.

[0060] In one embodiment, the first switch tube Q1 and the third switch tube Q3 are P-MOS tubes, and the second switch tube Q2 and the fourth switch tube Q4 are N-MOS tubes; the source of the first switch tube Q1 is connected to the signal input terminal VIN, the drain of the first switch tube Q1 is connected to the first output terminal VO1, and the gate of the first switch tube Q1 is connected to the second output terminal VO2; the drain of the second switch tube Q2 is connected to the second output terminal VO2, the source of the second switch tube Q2 is grounded, and the gate of the second switch tube Q2 is connected to the drain of the first switch tube Q1; the source of the third switch tube Q3 is connected to the signal input terminal VIN, the drain of the third switch tube Q3 is connected to the second output terminal VO2, and the gate of the third switch tube Q3 is connected to the first output terminal VO1; the drain of the fourth switch tube Q4 is connected to the first output terminal VO1, the source of the fourth switch tube Q4 is grounded, and the gate of the fourth switch tube Q4 is connected to the drain of the third switch tube Q3.

[0061] As an example, when the first switch tube Q1 and the third switch tube Q3 are P-MOS tubes, and the second switch tube Q2 and the fourth switch tube Q4 are N-MOS tubes, Figure 1 As shown, the source of the first switch tube Q1 is connected to the signal input terminal VIN, the drain of the first switch tube Q1 is connected to the first output terminal VO1, and the gate of the first switch tube Q1 is connected to the second output terminal VO2; the drain of the second switch tube Q2 is connected to the second output terminal VO2, the source of the second switch tube Q2 is grounded, and the gate of the second switch tube Q2 is connected to the drain of the first switch tube Q1; the source of the third switch tube Q3 is connected to the signal input terminal VIN, the drain of the third switch tube Q3 is connected to the second output terminal VO2, and the gate of the third switch tube Q3 is connected to the first output terminal VO1; the drain of the fourth switch tube Q4 is connected to the first output terminal VO1, the source of the fourth switch tube Q4 is grounded, and the gate of the fourth switch tube Q4 is connected to the drain of the third switch tube Q3.

[0062] When the positive electrode of the electric device 3 is connected to the first output terminal VO1 and the negative electrode of the electric device 3 is connected to the second output terminal VO2, the gate voltage of the third switch tube Q3 is higher than the source voltage, the third switch tube Q3 is cut off, the source voltage of the first switch tube Q1 is higher than the gate voltage, the first switch tube Q1 is turned on, so that the gate voltage of the second switch tube Q2 is greater than the turn-on voltage of the second switch tube Q2, and the second switch tube Q2 is also turned on, so that the power supply voltage signal output by the first switch circuit 1 passes through the first output terminal VO1, the positive electrode of the electric device 3, the negative electrode of the electric device 3 and the second output terminal VO2 in sequence, forming a power supply loop.

[0063] When the positive electrode of the electric device 3 is connected to the second output terminal VO2 and the negative electrode of the electric device 3 is connected to the first output terminal VO1, the gate 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 gate voltage, the third switch tube Q3 is turned on, so that the gate voltage of the fourth switch tube Q4 is greater than the turn-on voltage of the fourth switch tube Q4, and the fourth switch tube Q4 is also turned on, so that the power supply voltage signal output by the second switch circuit 2 passes through the second output terminal VO2, the positive electrode of the electric device 3, the negative electrode of the electric device 3 and the first output terminal VO1 in sequence, forming a power supply loop.

[0064] In another embodiment, the first switch tube Q1 and the third switch tube Q3 are PNP type transistors, and the second control tube and the fourth switch tube Q4 are NPN type transistors; the emitter of the first switch tube Q1 is connected to the signal input terminal VIN, the collector of the first switch tube Q1 is connected to the first output terminal VO1, and the base of the first switch tube Q1 is connected to the second output terminal VO2; the collector of the second switch tube Q2 is connected to the second output terminal VO2, the emitter of the second switch tube Q2 is grounded, and the base of the second switch tube Q2 is connected to the collector of the third switch tube Q3; the emitter of the third switch tube Q3 is connected to the signal input terminal VIN, the collector of the third switch tube Q3 is connected to the second output terminal VO2, and the base of the third switch tube Q3 is connected to the first output terminal VO1; the collector of the fourth switch tube Q4 is connected to the first output terminal VO1, the emitter of the fourth switch tube Q4 is grounded, and the base of the fourth switch tube Q4 is connected to the collector of the third switch tube Q3.

[0065] As another example, when the first switch tube Q1 and the third switch tube Q3 are PNP type transistors, and the second control tube and the fourth switch tube Q4 are NPN type transistors, the emitter of the first switch tube Q1 is connected to the signal input terminal VIN, the collector of the first switch tube Q1 is connected to the first output terminal VO1, and the base of the first switch tube Q1 is connected to the second output terminal VO2; the collector of the second switch tube Q2 is connected to the second output terminal VO2, the emitter of the second switch tube Q2 is grounded, and the base of the second switch tube Q2 is connected to the collector of the third switch tube Q3; the emitter of the third switch tube Q3 is connected to the signal input terminal VIN, the collector of the third switch tube Q3 is connected to the second output terminal VO2, and the base of the third switch tube Q3 is connected to the first output terminal VO1; the collector of the fourth switch tube Q4 is connected to the first output terminal VO1, the emitter of the fourth switch tube Q4 is grounded, and the base of the fourth switch tube Q4 is connected to the collector of the third switch tube Q3.

[0066] When the positive electrode of the electric device 3 is connected to the first output terminal VO1 and the negative electrode of the electric device 3 is connected to the second output terminal VO2, the base voltage of the third switch tube Q3 is higher than the emitter voltage, the third switch tube Q3 is cut off, the emitter voltage of the first switch tube Q1 is higher than the base voltage, the first switch tube Q1 is turned on, so that the base voltage of the second switch tube Q2 is greater than the turn-on voltage of the second switch tube Q2, and the second switch tube Q2 is also turned on, so that the power supply voltage signal output by the first switch circuit 1 passes through the first output terminal VO1, the positive electrode of the electric device 3, the negative electrode of the electric device 3 and the second output terminal VO2 in sequence, forming a power supply loop.

[0067] When the positive electrode of the electric device 3 is connected to the second output terminal VO2 and the negative electrode of the electric device 3 is connected to the first output terminal VO1, 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 turned on, so that the base voltage of the fourth switch tube Q4 is greater than the turn-on voltage of the fourth switch tube Q4, and the fourth switch tube Q4 is also turned on, so that the power supply voltage signal output by the second switch circuit 2 passes through the second output terminal VO2, the positive electrode of the electric device 3, the negative electrode of the electric device 3 and the first output terminal VO1 in sequence, forming a power supply loop.

[0068] In one embodiment, the first switch circuit 1 further includes a first resistor R1 and a second resistor R2, and the second switch circuit 2 further includes a third resistor R3 and a fourth resistor R4; the two ends of the first resistor R1 are respectively connected to the control end of the first switch tube Q1 and the second output end VO2; the two ends of the second resistor R2 are respectively connected to the control end of the second switch tube Q2 and the first output end VO1; the two ends of the third resistor R3 are respectively connected to the first output end VO1 and the control end of the third switch tube Q3; the two ends of the fourth resistor R4 are respectively connected to the second output end VO2 and the control end of the fourth switch tube Q4.

[0069] As an example, the first switch circuit 1 further includes a first resistor R1 and a second resistor R2, and the second switch circuit 2 further includes a third resistor R3 and a fourth resistor R4; the two ends of the first resistor R1 are respectively connected to the control end of the first switch tube Q1 and the second output end VO2, and are used to provide a start-up voltage for the first switch tube Q1. The two ends of the second resistor R2 are respectively connected to the control end of the second switch tube Q2 and the first output end VO1, and are used to provide a start-up voltage for the second switch tube Q2. The two ends of the third resistor R3 are respectively connected to the first output end VO1 and the control end of the third switch tube Q3, and are used to provide a start-up voltage for the third switch tube Q3. The two ends of the fourth resistor R4 are respectively connected to the second output end VO2 and the control end of the fourth switch tube Q4, and are used to provide a start-up voltage for the fourth switch tube Q4.

[0070] In one embodiment, the power switch circuit further includes a first capacitor C1 ; a first end of the first capacitor C1 is connected to the signal input end VIN, and a second end of the first capacitor C1 is grounded.

[0071] As an example, the power supply switch circuit further includes a first capacitor C1. The first end of the first capacitor C1 is connected to the signal input terminal VIN, and the second end of the first capacitor C1 is grounded, for filtering out the AC component in the power supply voltage signal, and playing the role of energy storage and voltage stabilization.

[0072] The embodiment of the utility model also provides a power supply circuit, including a transformer module 4 and a power supply switch circuit in any of the above embodiments, wherein the primary end of the transformer module 4 is used to connect to a power supply, and the secondary end of the transformer module 4 is connected to a signal input end VIN of the power supply switch circuit; the power supply switch circuit is also used to connect to an electrical device 3, and when the first output end VO1 is connected to the positive pole of the electrical device 3, and the second output end VO2 is connected to the negative pole of the electrical device 3, the first switch circuit 1 is turned on and the second switch circuit 2 is turned off; when the first output end VO1 is connected to the negative pole of the electrical device 3, and the second output end VO2 is connected to the positive pole of the electrical device 3, the first switch circuit 1 is turned off and the second switch circuit 2 is turned on.

[0073] As an example, the power supply circuit includes a transformer module 4 and a power supply switch circuit in any of the above examples, and the primary end of the transformer module 4 is used to connect to a power supply, which can be a DC power supply or a mains circuit 8. The secondary end of the transformer module 4 is connected to a signal input end VIN of the power supply switch circuit, and outputs a power supply voltage signal to the power supply switch circuit. When the electric device 3 is connected to the power supply switch circuit, if the positive electrode of the electric device 3 is connected to the first output terminal VO1 and the negative electrode is connected to the second output terminal VO2, the first switch tube Q1 in the power supply switch circuit is turned on, the third switch tube Q3 is turned off, and the first switch tube Q1 controls the second switch tube Q2 to be turned on, so that the power supply voltage signal output by the first switch circuit 1 passes through the first output terminal VO1, the positive electrode of the electric device 3, the negative electrode of the electric device 3 and the second output terminal VO2 in sequence to form a power supply loop; if the positive electrode of the electric device 3 is connected to the second output terminal VO2 and the negative electrode is connected to the first output terminal VO1, the third switch tube Q3 in the power supply switch circuit is turned on, the first switch tube Q1 is turned off, and the third switch tube Q3 controls the fourth switch tube Q4 to be turned on, so that the power supply voltage signal output by the second switch circuit 2 passes through the second output terminal VO2, the positive electrode of the electric device 3, the negative electrode of the electric device 3 and the first output terminal VO1 in sequence to form a power supply loop.

[0074] In this example, by setting the first switch circuit 1 and the second switch circuit 2 in the power supply switch circuit, the two access methods of the electrical equipment 3 can be responded to respectively. The positive and negative polarities of the electrical equipment 3 when connected can be intelligently identified and the corresponding conduction circuit can be opened. When the electrical equipment 3 is connected to the power supply circuit in the positive or reverse connection, a normal power supply circuit can be formed to supply power to the electrical equipment 3.

[0075] In one embodiment, the power supply circuit also includes an EMC module 5, an input-end rectifying and filtering module 6, and an output-end rectifying and filtering module 7; the first end of the EMC module 5 is used to connect to the mains circuit 8, the second end of the EMC module 5 is connected to the first end of the input-end rectifying and filtering module 6, the second end of the input-end rectifying and filtering module 6 is connected to the primary end of the transformer module 4, the secondary end of the transformer module 4 is connected to the first end of the output-end rectifying and filtering module 7, and the second end of the output-end rectifying and filtering module 7 is connected to the signal input end VIN of the power supply switch circuit.

[0076] As an example, the power supply circuit also includes an EMC module 5, an input-end rectifying and filtering module 6, and an output-end rectifying and filtering module 7. The first end of the EMC module 5 is connected to the mains circuit 8, and the second end of the EMC module 5 is connected to the first end of the input-end rectifying and filtering module 6, which is used to prevent external electromagnetic interference from affecting the components in the power supply circuit, and also prevent the internal components of the circuit from generating electromagnetic interference to the power grid. The second end of the input-end rectifying and filtering module 6 is connected to the primary end of the transformer module 4, which is used to rectify and filter the input mains voltage, the first end of the output-end rectifying and filtering module 7 is connected to the secondary end of the transformer module 4, and the second end of the output-end rectifying and filtering module 7 is connected to the signal input end VIN of the power supply switch circuit, which is used to synchronously sort and filter the voltage output by the transformer module 4, so that the output power supply voltage signal is smoother.

[0077] In one embodiment, the power supply circuit also includes 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 status information transmission circuit, a switch signal receiving circuit and a photoelectric coupling circuit; the first end of the power supply status information transmission circuit is connected to the metering module 9, and the second end of the power supply status information transmission circuit is used to communicate with the external terminal 12 and output the power supply status information to the external terminal 12; the first end of the switch signal receiving circuit is communicated with the external terminal 12, the second end of the switch signal receiving circuit is connected to the primary end of the photoelectric coupling circuit, and the secondary end of the photoelectric coupling circuit is connected to the remote control switch 10; the switch signal receiving circuit is used to receive the power supply control signal output by the external terminal 12, and control the conduction of the photoelectric coupling circuit according to the power supply control signal, and the remote control switch 10 is used to control the transformer module 4 to connect or disconnect the input rectifier and filter module 6 when the photoelectric coupling circuit is turned on.

[0078] As an example, the power supply circuit also includes 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 status information transmission circuit, a switch signal receiving circuit and a photoelectric coupling circuit. The first end of the power supply status information transmission circuit is connected to the metering module 9, and the second end of the power supply status information transmission circuit is used to communicate with the external terminal 12. The metering module 9 may include a temperature detection unit, a current detection unit, a voltage detection unit and a power detection unit, etc., to perform real-time detection of the current temperature, current, voltage, power and other power supply status information of the power supply circuit, and report the detected power supply status information to the optocoupler Wi-Fi module 11 through the power supply status information transmission circuit. The optocoupler Wi-Fi module 11 is connected to the external terminal 12 in communication, and can output the received power supply status information to the external terminal 12. The first end of the switch signal receiving circuit is connected to the external terminal 12 in communication, the second end of the switch signal receiving circuit is connected to the primary end of the photoelectric coupling circuit, and the secondary end of the photoelectric coupling circuit is connected to the remote control switch 10. The switch signal receiving circuit is used to control the conduction of the photoelectric coupling circuit according to the power supply control signal output by the external terminal 12, and the remote control switch 10 is used to control the transformer module 4 to connect or disconnect the input end rectifier filter module 6 when the photoelectric coupling circuit is turned on. In this example, by setting the photoelectric coupling circuit, the metering module 9 and the remote control switch 10 can be isolated to prevent the transformer primary and secondary common phenomenon.

[0079] In one embodiment, the power supply circuit also includes a metering module 9 and a first Wi-Fi module; the first end of the metering module 9 is connected to the second end of the output rectifier and filter module 7, the second end of the metering module 9 is connected to the signal input end of the power supply switch circuit, and the third end of the metering module 9 is connected to the first Wi-Fi module, which is used to output power supply status information to the first Wi-Fi module; the first Wi-Fi module is used to communicate with the external terminal 12 and output power supply status information to the external terminal 12.

[0080] As an example, the power supply circuit also includes a metering module 9 and a first Wi-Fi module. The first end of the metering module 9 is connected to the second end of the output rectifier filter module 7, the second end of the metering module 9 is connected to the signal input end of the power supply switch circuit, and the third end of the metering module 9 is connected to the first Wi-Fi module. The metering module 9 may include a temperature detection unit, a current detection unit, a voltage detection unit, a power detection unit, etc., to perform real-time detection of the current temperature, current, voltage, power and other power supply status information of the power supply circuit, and report the detected power supply status information to the first Wi-Fi module. The first Wi-Fi module is connected to the external terminal 12 in communication, and can output the received power supply status information to the external terminal 12.

[0081] In one embodiment, the power supply circuit also includes a remote control switch 10 and a second Wi-Fi module; the second Wi-Fi module is used to communicate with the external terminal 12, receive the power supply control signal output by the external terminal 12, and control the remote control switch 10 to be turned on or off according to the power supply control signal; the first end of the remote control switch 10 is connected to the second end of the input rectifier and filter module 6, the second end of the remote control switch 10 is connected to the transformer module 4, and the third end of the remote control switch 10 is connected to the second Wi-Fi module, which is used to be turned on under the control of the second Wi-Fi module, and control the connection of the transformer module 4 and the input rectifier and filter module 6, or turned off under the control of the second Wi-Fi module, and control the disconnection of the transformer module 4 and the input rectifier and filter module 6.

[0082] As an example, the power supply circuit also includes a remote control switch 10 and a second Wi-Fi module. The first end of the remote control switch 10 is connected to the second end of the input rectifier and filter module 6, the second end of the remote control switch 10 is connected to the transformer module 4, the third end of the remote control switch 10 is connected to the second Wi-Fi module, and the second Wi-Fi module is connected to the external terminal 12. During the operation of the circuit, the second Wi-Fi module communicates with the external terminal 12, and according to the requirements of the external terminal 12, the remote control switch 10 is controlled to be turned on, so that the transformer module 4 is connected to the input rectifier and filter module 6, and the power supply circuit can output the power supply voltage signal; or, according to the requirements of the external terminal 12, the remote control switch 10 is controlled to be turned off, so that the transformer module 4 is disconnected from the input rectifier and filter module 6, and the power supply circuit cannot output the power supply voltage signal.

[0083] The embodiment of the utility model further provides a power supply device, including a housing and the power supply circuit in the above embodiment, wherein the input end of the power supply circuit is used to connect to the mains circuit 8 , and the output end of the power supply circuit is used to connect to the power-consuming device 3 .

[0084] As an example, the power supply device includes the power supply circuit in the above example, the input end of the power supply circuit is used to connect to the power supply, which can be a DC power supply or a mains circuit 8, and the output end of the power supply circuit is used to connect to the electrical equipment 3.

[0085] In this example, by setting the first switch circuit 1 and the second switch circuit 2 in the power supply switch circuit, the two access methods of the electrical equipment 3 can be responded to respectively. The positive and negative polarities of the electrical equipment 3 when connected can be intelligently identified and the corresponding conduction circuit can be opened. When the electrical equipment 3 is connected to the power supply circuit in the positive or reverse connection, a normal power supply circuit can be formed to supply power to the electrical equipment 3.

[0086] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A power supply switch circuit, characterized in that: It includes a signal input terminal, a first output terminal, a second output terminal, a first switch circuit and a second switch circuit; The signal input end is used to connect to a power supply, and the first output end and the second output end are used to connect to an electrical device; The first switch circuit includes a first switch tube and a second switch tube; the first end of the first switch tube is connected to the signal input end, the second end of the first switch tube is connected to the first output end, and the control end of the first switch tube is connected to the second output end; the first end of the second switch tube is connected to the second output end, the second end of the second switch tube is grounded, and the control end of the second switch tube is connected to the second end of the first switch tube; The second switch circuit includes a third switch tube and a fourth switch tube; the first end of the third switch tube is connected to the signal input end and the second output end, and the control end of the third switch tube is connected to the first output end; the first end of the fourth switch tube is connected to the first output end, the second end of the fourth switch tube is grounded, and the control end of the fourth switch tube is connected to the second end of the third switch tube; When the first output terminal is connected to the positive electrode of the electric device, and the second output terminal is connected to the negative electrode of the electric device, the first switch circuit is turned on and the second switch circuit is turned off; When the first output end is connected to the negative electrode of the electric device and the second output end is connected to the positive electrode of the electric device, the first switch circuit is disconnected and the second switch circuit is turned on.

2. The power switch circuit according to claim 1, characterized in that: The first switch tube and the third switch tube are P-MOS tubes, and the second switch tube and the fourth switch tube are N-MOS tubes; The source of the first switch tube is connected to the signal input terminal, the drain of the first switch tube is connected to the first output terminal, and the gate of the first switch tube is connected to the second output terminal; The drain of the second switch tube is connected to the second output terminal, the source of the second switch tube is grounded, and the gate of the second switch tube is connected to the drain of the first switch tube; The source of the third switch tube is connected to the signal input terminal, the drain of the third switch tube is connected to the second output terminal, and the gate of the third switch tube is connected to the first output terminal; The drain of the fourth switch tube is connected to the first output end, the source of the fourth switch tube is grounded, and the gate of the fourth switch tube is connected to the drain of the third switch tube; Alternatively, the first switch tube and the third switch tube are triodes, and the second switch tube and the fourth switch tube are triodes; The emitter of the first switch tube is connected to the signal input terminal, the collector of the first switch tube is connected to the first output terminal, and the base of the first switch tube is connected to the second output terminal; The collector of the second switch tube is connected to the second output terminal, the emitter of the second switch tube is grounded, and the base of the second switch tube is connected to the collector of the first switch tube; The emitter of the third switch tube is connected to the signal input terminal, the collector of the third switch tube is connected to the second output terminal, and the base of the third switch tube is connected to the first output terminal; The collector of the fourth switch tube is connected to the first output end, the emitter of the fourth switch tube is grounded, and the base of the fourth switch tube is connected to the collector of the third switch tube.

3. The power switch circuit according to claim 1, characterized in that: The first switch circuit further includes a first resistor and a second resistor, and the second switch circuit further includes a third resistor and a fourth resistor; Two ends of the first resistor are respectively connected to the control end of the first switch tube and the second output end; Two ends of the second resistor are respectively connected to the control end of the second switch tube and the first output end; Two ends of the third resistor are respectively connected to the first output end and the control end of the third switch tube; Two ends of the fourth resistor are connected to the second output end and the control end of the fourth switch tube respectively.

4. The power switch circuit according to claim 1, characterized in that: The power switch circuit further includes a first capacitor; A first end of the first capacitor is connected to the signal input end, and a second end of the first capacitor is grounded.

5. A power supply circuit, characterized in that: comprising a transformer module and a power supply switch circuit according to any one of claims 1 to 4, The primary end of the transformer module is used to connect to a power supply, and the secondary end of the transformer module is connected to a signal input end of the power switch circuit; The power supply switch circuit is also used to be connected to an electrical device. When the first output end is connected to the positive pole of the electrical device and the second output end is connected to the negative pole of the electrical device, the first switch circuit is turned on and the second switch circuit is turned off; when the first output end is connected to the negative pole of the electrical device and the second output end is connected to the positive pole of the electrical device, the first switch circuit is turned off and the second switch circuit is turned on.

6. The power supply circuit according to claim 5, characterized in that: The power supply circuit also includes an EMC module, an input-end rectifying and filtering module, and an output-end rectifying and filtering module; The first end of the EMC module is used to connect to the mains circuit, the second end of the EMC module is connected to the first end of the input rectifier and filter module, the second end of the input rectifier and filter module is connected to the primary end of the transformer module, the secondary end of the transformer module is connected to the first end of the output rectifier and filter module, and the second end of the output rectifier and filter module is connected to the signal input end of the power supply switch circuit.

7. The power supply circuit according to claim 6, characterized in that: The power supply circuit also includes a metering module, a remote control switch and an optical coupler Wi-Fi module; The optical coupler Wi-Fi module includes a power supply status information transmission circuit, a switch signal receiving circuit and a photoelectric coupling circuit; The first end of the power supply status information transmission circuit is connected to the metering module, and the second end of the power supply status information transmission circuit is used to communicate with an external terminal and output power supply status information to the external terminal; The first end of the switch signal receiving circuit is communicatively connected to the external terminal, the second end of the switch signal receiving circuit is connected to the primary end of the photoelectric coupling circuit, and the secondary end of the photoelectric coupling circuit is connected to the remote control switch; The switch signal receiving circuit is used to receive the power supply control signal output by the external terminal, and control the conduction of the photoelectric coupling circuit according to the power supply control signal. The remote control switch is used to control the transformer module to connect or disconnect the input-end rectifier and filter module when the photoelectric coupling circuit is turned on.

8. The power supply circuit according to claim 6, characterized in that: The power supply circuit also includes a metering module and a first Wi-Fi module; The first end of the metering module is connected to the second end of the output-end rectifying and filtering module, the second end of the metering module is connected to the signal input end of the power supply switch circuit, and the third end of the metering module is connected to the first Wi-Fi module, for outputting power supply status information to the first Wi-Fi module; The first Wi-Fi module is used to communicate with an external terminal and output power supply status information to the external terminal.

9. The power supply circuit according to claim 6, characterized in that: The power supply circuit also includes a remote control switch and a second Wi-Fi module; The second Wi-Fi module is used to communicate with the external terminal, receive the power supply control signal output by the external terminal, and control 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 to the second end of the input-end rectifying and filtering module, the second end of the remote control switch is connected to the transformer module, and the third end of the remote control switch is connected to the second Wi-Fi module, and is used to be turned on under the control of the second Wi-Fi module to control the connection of the transformer module and the input-end rectifying and filtering module, or to be turned off under the control of the second Wi-Fi module to control the disconnection of the transformer module and the input-end rectifying and filtering module.

10. A power supply device, characterized in that: The power supply circuit comprises the power supply circuit according to any one of claims 5 to 9, wherein the input end of the power supply circuit is used to connect to a power supply source, and the output end of the power supply circuit is used to connect to an electrical device.

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