Power supply protection circuit and device

Abstract

The utility model relates to the technical field of circuit design, in particular to a power supply protection circuit and device. The surge suppressor is arranged between the live wire and the zero wire, so that differential mode protection is realized; a first piezoresistor and a gas discharge tube are arranged between a zero wire and a ground wire, and a second piezoresistor and a gas discharge tube are arranged between a live wire and the ground wire, so that common-mode protection is realized; in addition, a first resistor is arranged between the zero line and the ground wire, and a second resistor is arranged between the live wire and the ground wire, so that discharge protection after power failure is realized; in conclusion, through the design of the power supply protection circuit, the power supply can be ensured to provide stable power supply for the electronic equipment.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit design technical field, specifically, a kind of power protection circuit and device. BACKGROUND

[0002] Power interface is connected with power grid, and provides electrical energy for electrical equipment. The stability of its power interface power supply is directly related to whether the related electronic equipment can work safely and reliably.

[0003] When the power grid has high-power inductive load switching or the power grid is struck by lightning, transient pulse interference and surge interference will be generated at the power interface. If the power interface is not protected by filtering design, these interferences can easily affect the normal operation of electronic equipment, and lightning interference can even damage electronic equipment. Therefore, the power interface needs to be designed with a power protection circuit to ensure stable power supply for electronic equipment. SUMMARY

[0004] The utility model aims at providing a kind of power protection circuit and device to solve the technical problem that the prior art cannot ensure that the power supply provides stable power for electronic equipment.

[0005] The utility model embodiment provides a kind of power protection circuit, the power protection circuit includes protection module;The protection module includes surge suppressor, gas discharge tube, first voltage-dependent resistor, second voltage-dependent resistor, first resistance and second resistance;The surge suppressor one end is connected with fire line, and the other end is connected with zero line;The first voltage-dependent resistor one end is connected with zero line, and the other end is connected with the first end of the gas discharge tube;The second voltage-dependent resistor one end is connected with fire line, and the other end is connected with the first end of the gas discharge tube;The second end of the gas discharge tube is grounded;The first resistance one end is connected zero line, and the other end is grounded;The second resistance one end is connected with fire line, and the other end is grounded.

[0006] Optionally, the power protection circuit further includes a power filter module;The power signal filter module includes power filter.

[0007] Optionally, the power protection circuit further includes an insurance module;The insurance module includes first fuse and second fuse;The first fuse is arranged in fire line, and the second fuse is arranged in zero line.

[0008] Optionally, the power protection circuit further includes an emergency stop switch module;The emergency stop switch module includes first emergency stop switch and second emergency stop switch;The first emergency stop switch is arranged in fire line, and the second emergency stop switch is arranged in zero line.

[0009] Optionally, the resistance value range of the first resistance and the second resistance is 2MΩ-5MΩ.

[0010] The power supply protection circuit has the advantages that:

[0011] The surge suppressor is arranged between the live wire and the zero wire to realize differential mode protection, the first voltage-dependent resistor and the gas discharge tube are arranged between the zero wire and the ground wire, and the second voltage-dependent resistor and the gas discharge tube are arranged between the live wire and the ground wire to realize common mode protection, in addition, the first resistor is arranged between the zero wire and the ground wire, and the second resistor is arranged between the live wire and the ground wire to realize discharge protection after power failure, and the power supply protection circuit can ensure stable power supply for electronic equipment.

[0012] The power supply protection device has the advantages that:

[0013] Optionally, the power supply module comprises an alternating current power input socket and a power switch module, the power switch module comprises a first power switch and a second power switch, the first power switch is arranged on the live wire, and the second power switch is arranged on the zero wire.

[0014] Optionally, the power supply module comprises a filter capacitor.

[0015] Optionally, the input of the power supply module is an alternating current signal, and the output is a direct current signal.

[0016] Optionally, the power supply module is powered by 220V two-phase alternating current.

[0017] The power supply protection device has the advantages that:

[0018] The power supply protection device adopts the power supply protection circuit, and correspondingly has all the advantages of the power supply protection circuit, so that the power supply protection device can stably supply power to electronic equipment, and the advantages of the power supply protection circuit are specifically described above, and will not be repeated here.

[0019] In addition, the power supply protection device further comprises a power supply module, which can convert alternating current into direct current to supply power to electronic equipment. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description can be obtained by the provided drawings without creative labor for the person skilled in the art.

[0021] Figure 1The power protection circuit and device structure schematic diagram provided by the embodiment of the utility model.

[0022] Mark explanation:

[0023] 110 - AC power input socket, 120 - power switch module, 130 - insurance module,

[0024] 140 - emergency stop switch module, 150 - protection module,

[0025] 160 - power signal filtering module, 170 - power module. Specific implementation

[0026] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below with reference to the drawings.It should be understood that the specific embodiments described herein are only used to explain the utility model and not to limit the utility model.

[0027] The embodiment of the utility model provides a kind of power protection circuit, and the power protection circuit includes protection module;The above-mentioned protection module includes surge suppressor, gas discharge tube, first voltage-dependent resistor, second voltage-dependent resistor, first resistance and second resistance.

[0028] Wherein, surge suppressor one end is connected with fire line, and the other end is connected with zero line;The one end of first voltage-dependent resistor is connected with zero line, and the other end is connected with the first end of gas discharge tube;The one end of second voltage-dependent resistor is connected with fire line, and the other end is connected with the first end of gas discharge tube;The second end of gas discharge tube is grounded;The one end of first resistance is connected zero line, and the other end is grounded;The one end of second resistance is connected fire line, and the other end is grounded.

[0029] The above-mentioned power protection circuit has the beneficial effect that: surge suppressor is arranged between fire line-zero line, for when one of fire line or zero line exceeds preset collapse voltage, carries out conduction shunt, realizes difference mode protection;First voltage-dependent resistor and gas discharge tube are arranged between zero line and ground wire, and second voltage-dependent resistor and gas discharge tube are arranged between fire line and ground wire, for when fire line and zero line all exceed preset collapse voltage, carry out conduction shunt, realize common mode protection;In addition, by being arranged between zero line-ground line first resistance, and being arranged between fire line-ground line second resistance, for discharge after power failure, realize discharge protection after power failure;Above all, by the design of the above-mentioned power protection circuit, it can ensure that power supply provides stable power supply for electronic equipment work.

[0030] Optionally, the above-mentioned power protection circuit further includes power filtering module;Wherein, power signal filtering module includes power filter.

[0031] Optionally, the power protection circuit further comprises an insurance module; wherein the insurance module comprises a first fuse and a second fuse; the first fuse is arranged on the live wire, and the second fuse is arranged on the neutral wire.

[0032] Optionally, the power protection circuit further comprises an emergency stop switch module; wherein the emergency stop switch module comprises a first emergency stop switch and a second emergency stop switch; the first emergency stop switch is arranged on the live wire, and the second emergency stop switch is arranged on the neutral wire.

[0033] Optionally, the resistance value of the first resistor and the second resistor ranges from 2MΩ to 5MΩ.

[0034] The utility model embodiment provides a kind of power protection device, including power supply module, power module and above-mentioned power protection circuit.

[0035] Optionally, the power supply module comprises an AC power input socket and a power switch module; wherein the power switch module comprises a first power switch and a second power switch; the first power switch is arranged on the live wire, and the second power switch is arranged on the neutral wire.

[0036] Optionally, the power module comprises a filter capacitor.

[0037] Optionally, the input of the power module is an AC signal, and the output is a DC signal.

[0038] Optionally, the power supply module is powered by 220V two-phase AC power.

[0039] As described above, the power protection device adopts the above-mentioned power protection circuit, so that the power protection device has all the advantages of the above-mentioned power protection circuit, which enables the power protection device to provide stable power supply for electronic devices. For details, please refer to the beneficial effects of the above-mentioned power protection circuit, which will not be repeated here.

[0040] In addition, the power protection device further comprises a power module, which can convert AC power into DC power to supply power to electronic devices.

[0041] The utility model will be further described in detail below through specific embodiment and in combination with the drawings.

[0042] Referring to the power protection circuit and device structure schematic diagram shown in the drawing, Figure 1 The utility model embodiment provides a kind of power protection circuit and device, specifically includes: AC power input socket 110, power switch module 120, insurance module 130, emergency stop switch module 140, protection module 150, power signal filter module 160, power module 170.

[0043] Specifically, the protection module 150 includes a surge suppressor KA1, a gas discharge tube GDT1, a first voltage-dependent resistor VDR1, a second voltage-dependent resistor VDR2, a first resistor R1 and a second resistor R2; wherein the resistance value range of the first resistor R1 and the second resistor R2 is 2MΩ-5MΩ. It should be noted that there is also a very small current through the first resistor R1 and the second resistor R2 under the power supply protection circuit and device power-on condition, that is, the power consumed by the first resistor R1 and the second resistor R2 is very small.

[0044] Wherein, one end of the surge suppressor KA1 is connected with the live wire L, and the other end is connected with the neutral wire N; one end of the first voltage-dependent resistor VDR1 is connected with the neutral wire N, and the other end is connected with the first end of the gas discharge tube GDT1; one end of the second voltage-dependent resistor VDR2 is connected with the live wire L, and the other end is connected with the first end of the gas discharge tube GDT1; the second end of the gas discharge tube GDT1 is grounded; one end of the first resistor R1 is connected with the neutral wire N, and the other end is grounded; one end of the second resistor R2 is connected with the live wire L, and the other end is grounded.

[0045] Specifically, the AC power input socket 110 is powered by 220V AC power.

[0046] Specifically, the power switch module 120 includes a first power switch and a second power switch; the first power switch is arranged at 1, 2, that is, arranged at the live wire L; the second power switch is arranged at 4, 5, that is, arranged at the neutral wire N.

[0047] Specifically, the fuse module 130 includes a first fuse and a second fuse; the first fuse is arranged at the live wire L, and the second fuse is arranged at the neutral wire N.

[0048] Specifically, the emergency stop switch module 140 includes a first emergency stop switch and an emergency stop switch; the emergency stop switch is arranged at the live wire L, and the second emergency stop switch is arranged at the neutral wire N. When an emergency occurs, the power supply is cut off through the emergency stop switch module 140, so as to protect the safety of personnel and equipment.

[0049] Specifically, the power signal filtering module 160 includes a power filter, which realizes isolation and elimination of interference signals.

[0050] Specifically, the power module 170 is an input AC signal and an output DC signal, which includes a filter capacitor, so that the power module 170 has a residual voltage after power failure. The power module 170 can release the residual voltage after power failure through the first resistor R1 and the second resistor R2.

[0051] Exemplarily, the working principle of the power protection circuit and device is as follows:

[0052] When one of the live wire L and the zero wire N is high (i.e. because of the sudden peak current or voltage interference from the outside world), the surge suppressor KA1 is turned on to shunt, thereby avoiding the surge damage to other devices in the circuit.

[0053] When the live wire L and the zero wire N are both high to the predetermined breakdown voltage, the voltage-dependent resistor VDR1 / VDR2 is turned on to shunt, and the current is released through the gas discharge tube GDT1, thereby avoiding the surge damage to other devices in the circuit.

[0054] Because the power module 170 has a filter capacitor, there is still a certain residual voltage after power off. To ensure the safety of the operator, the power residual voltage after power off is released through R1 and R2 of the protection module 150, thereby achieving the qualified residual voltage.

[0055] It should be noted that when the above power protection circuit and device are used, the safety protection device does not need to be removed, and the safety, EMC test items and standards as shown in Table 1 can be passed.

[0056] Table 1

[0057]

[0058]

[0059] The embodiment of the utility model establishes the differential mode protection between the live wire-zero wire (L-N); the common mode protection is established between the live wire-ground wire (L-PE) and the zero wire-ground wire (N-PE); and the embodiment of the utility model is suitable for the medical level device and the power protection circuit; in addition, the embodiment of the utility model solves the poor lightning surge protection effect, the problem of easy to cause equipment failure, and the protection problem of electric shock injury caused by residual voltage when the operator pulls out the plug.

[0060] Although the utility model discloses as above, the utility model is not limited to this. Any person skilled in the art, without departing from the spirit and scope of the utility model, can make various changes and modifications, therefore the protection scope of the utility model should be limited by the range defined by the claims.

[0061] Finally, it should be noted that, in this document, the term "only" is used simply to set off from another element, rather than to necessarily require or imply that only that one element can be present. Also, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0062] The above description of disclosed embodiments provides enabling concepts for practicing or using the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power supply protection circuit, characterized by, The power supply protection circuit comprises a protection module; The protection module comprises a surge suppressor, a gas discharge tube, a first voltage-dependent resistor, a second voltage-dependent resistor, a first resistor and a second resistor; One end of the surge suppressor is connected with a live wire, and the other end is connected with a neutral wire; One end of the first voltage-dependent resistor is connected with the neutral wire, and the other end is connected with a first end of the gas discharge tube; one end of the second voltage-dependent resistor is connected with the live wire, and the other end is connected with the first end of the gas discharge tube; a second end of the gas discharge tube is grounded; One end of the first resistor is connected with the neutral wire, and the other end is grounded; one end of the second resistor is connected with the live wire, and the other end is grounded.

2. The power supply protection circuit of claim 1, wherein, The power supply protection circuit further comprises a power supply signal filtering module; The power supply signal filtering module comprises a power filter.

3. The power supply protection circuit of claim 1, wherein, The power supply protection circuit further comprises an insurance module; The insurance module comprises a first fuse and a second fuse; The first fuse is arranged on the live wire, and the second fuse is arranged on the neutral wire.

4. The power supply protection circuit of claim 1, wherein, The power supply protection circuit further comprises an emergency stop switch module; The emergency stop switch module comprises a first emergency stop switch and a second emergency stop switch; The first emergency stop switch is arranged on the live wire, and the second emergency stop switch is arranged on the neutral wire.

5. The power supply protection circuit of claim 1, wherein, The resistance value of the first resistor and the second resistor ranges from 2MΩ to 5MΩ.

6. A power protection device, characterized by The power supply protection circuit comprises a power supply module and a power supply module.

7. The power guard of claim 6, wherein, The power supply module comprises an AC power input socket and a power switch module; The power switch module comprises a first power switch and a second power switch; The first power switch is arranged on the live wire, and the second power switch is arranged on the neutral wire.

8. The power guard of claim 6, wherein, The power supply module comprises a filter capacitor.

9. The power guard of claim 6, wherein, The input of the power supply module is an AC signal, and the output is a DC signal.

10. The power guard of claim 6, wherein, The power supply module is powered by 220V two-phase AC power.

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