CN202940393U - Electric leakage protection plug - Google Patents
Electric leakage protection plug Download PDFInfo
- Publication number
- CN202940393U CN202940393U CN 201220610931 CN201220610931U CN202940393U CN 202940393 U CN202940393 U CN 202940393U CN 201220610931 CN201220610931 CN 201220610931 CN 201220610931 U CN201220610931 U CN 201220610931U CN 202940393 U CN202940393 U CN 202940393U
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- divider resistance
- plug
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- filter capacitor
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Abstract
The utility model discloses an electric leakage protection plug. The plug comprises a plug casing, a built-in circuit and a phase-zero-ground three-pole plug, wherein the built-in circuit comprises a control circuit used for controlling disconnection and connection of the three-pole plug, a first detection circuit used for generating a first control signal to control the three-pole plug to be in a disconnected state while detecting that the voltage between a zero wire and a ground line in a circuit is greater than a first predetermined threshold, a second detection circuit used for generating a second control signal to control the three-pole plug to be in a disconnected state while detecting that the leakage current between a phase wire and zero wire in the circuit is greater than a second predetermined threshold, and a third detection circuit used for generating a third control signal to control the three-pole plug to be in a disconnected state while detecting that the leakage current of the ground wire is greater than a third predetermined threshold. The electric leakage protection plug solves the problem that protection cannot be realized by an electric leakage protection plug when no ground wire exists or ground connection is abnormal, achieving the effect that protection is still realized when no ground wire exists or ground connection is abnormal.
Description
Technical field
The utility model relates to electric field, in particular to a kind of leakage protecting plug.
Background technology
In use often may there be leaky in household electrical appliance, and the user is caused potential safety hazard.For example, in the situation that without ground connection, if the electric equipment products electric leakage when causing product shell or related fittings charged, can cause certain harm to human body.In existing technology, exist leakage protecting plug to carry out earth leakage protective to electrical equipment, but this leakage protecting plug is in the situation that without ground wire or ground connection is abnormal does not move, can't play the effect of protection.
Problem for the leakage protecting plug in correlation technique can't play a protective role without ground wire or ground connection abnormal the time not yet proposes effective solution at present.
The utility model content
The utility model provides a kind of leakage protecting plug, to solve the problem that in correlation technique, leakage protecting plug can't play a protective role without ground wire or ground connection abnormal the time.
The utility model provides a kind of leakage protecting plug, comprise plug body, built-in circuit with mutually, zero, three-terminal polarized plus plug, wherein, built-in circuit comprises: control circuit, be used for controlling phase, zero, disconnection and the closure of three-terminal polarized plus plug; The first testing circuit is connected with control circuit, for detection of the voltage between zero line in circuit and ground wire during greater than the first predetermined threshold, produce the first control signal with control phase, zero, three-terminal polarized plus plug be in off-state; The second testing circuit is connected with control circuit, for detection of the leakage current between phase line in circuit and zero line during greater than the second predetermined threshold, produce the second control signal with control phase, zero, three-terminal polarized plus plug be in off-state; Three testing circuit is connected with control circuit, for detection of the leakage current of ground wire in circuit during greater than the 3rd predetermined threshold, produce the 3rd control signal with control phase, zero, three-terminal polarized plus plug be in off-state.
Further, control circuit comprises: rectification circuit, voltage stabilizing chip, controllable silicon and release, wherein, the silicon controlled first end is connected with the output of the first testing circuit, the second testing circuit and three testing circuit respectively, and silicon controlled the second end is connected with an end of release; The first end of rectification circuit is connected with the phase utmost point, the second end of rectification circuit be connected with the other end of release by the voltage stabilizing chip.
Further, the first testing circuit comprises: the first comparator, the first divider resistance, the second divider resistance, the first rectification triode and the first filter capacitor, wherein, the first end of the first divider resistance is connected with the zero utmost point of plug, the second end of the first divider resistance is connected with the first end of the second divider resistance, and the second end of the second divider resistance is connected with the earth polar of plug; The positive pole of the first rectification triode is connected with the second end of the first divider resistance, and the negative pole of the first rectification triode is connected with the first input end of the first comparator; The first end of the first filter capacitor is connected with the negative pole of the first rectification triode, the second end and the ground connection of the first filter capacitor; The second input of the first comparator respectively be connected the first end of reference voltage, the first current-limiting resistance and connect, the second end ground connection of the first current-limiting resistance, the output of the first comparator passes through or the first input end of logic gates is connected with the silicon controlled first end.
Further, the second testing circuit comprises: zero-sequence transformer, the second comparator, the second rectifier diode, the 3rd divider resistance, the 4th divider resistance, the second filter capacitor, the 3rd filter capacitor, wherein, the wire that connects phase line passes zero-sequence transformer with the wire that is connected zero utmost point, the first output of zero-sequence transformer is connected with the positive pole of the second rectifier diode, and the second output of zero-sequence transformer is connected and ground connection with the second end of the second filter capacitor; The negative pole of the second rectifier diode is connected with the first end of the 3rd divider resistance, and the second end of the 3rd divider resistance is connected with the first input end of the second comparator; The second input of the second comparator is connected with the first end of the second reference voltage, the second current-limiting resistance respectively, the second end ground connection of the second current-limiting resistance, and the output of the second comparator is connected with the silicon controlled first end; The first end of the 4th divider resistance is connected with the second end of the 3rd divider resistance, and the second end of the 4th divider resistance is connected and ground connection with the second end of the 3rd filter capacitor; The first end of the 3rd filter capacitor and the 4th divider resistance are connected in parallel; Be connected in parallel the second end of the second filter capacitor of the first end of the second filter capacitor and the first end of the 3rd divider resistance is connected and ground connection with the second end of the 4th divider resistance.
Further, three testing circuit comprises: current transformer, the 3rd rectifier diode, the 5th divider resistance, the 6th divider resistance, the 4th filter capacitor, wherein, the wire that connects the earth polar passes current transformer, the first output of current transformer is connected with the positive pole of the 3rd rectifier diode, and the second output of current transformer is connected and ground connection with the second end of the 4th filter capacitor; The negative pole of the 3rd rectifier diode is connected with the first end of the 5th divider resistance, and the second end of the 5th divider resistance passes through or the second input of logic gates is connected with the silicon controlled first end; The first end of the 6th divider resistance respectively with the second end of the 5th divider resistance be connected the second input of logic gates and be connected, the second end of the 6th divider resistance is connected with the second end of the 4th filter capacitor, and is connected in ground.
Further, also comprise: hookup is used for producing the 4th control signal to judge whether plug can carry out earth leakage protective by manual operation.
Further, hookup comprises: push-button switch and the 3rd current-limiting resistance, and wherein, the first end of push-button switch is connected with the zero utmost point of plug, and the second end of push-button switch is connected with the first end of the 3rd current-limiting resistance; The second end of the 3rd current-limiting resistance is connected with the phase utmost point of plug.
pass through the utility model, a kind of leakage protecting plug is provided, comprise zero, phase, the ground three-terminal polarized plus plug, the built-in circuit of this plug inside can detect respectively voltage between zero ground, leakage current between phase zero and the leakage current on ground wire, when detecting voltage between zero ground and surpass predetermined safe voltage, perhaps the leakage current between phase zero is greater than predetermined safe current, when perhaps there is larger electric current in ground terminal, comprising of controller plug is zero, phase, ground three utmost points disconnect, the circuit of this structure has effectively solved the problem that in the correlation technique, leakage protecting plug can't play a protective role without ground wire or ground connection abnormal the time, realization is still moved without ground wire or ground connection abnormal the time, and then reach the effect of electricity protection.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, consists of the application's a part, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not consist of improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is a kind of preferred structural representation according to the leakage protecting plug built-in circuit of the utility model embodiment; And
Fig. 2 is a kind of preferred circuit theory diagrams according to the leakage protecting plug of the utility model embodiment.
Embodiment
Hereinafter also describe in conjunction with the embodiments the utility model in detail with reference to accompanying drawing.Need to prove, in the situation that do not conflict, embodiment and the feature in embodiment in the application can make up mutually.
The utility model preferred embodiment provides a kind of leakage protecting plug, comprise: plug body, built-in circuit with mutually, zero, three-terminal polarized plus plug, Fig. 1 shows a kind of preferred structure chart of above-mentioned built-in circuit, as shown in Figure 1, built-in circuit comprises: control circuit 102, be used for to control phase, zero, disconnection and the closure of three-terminal polarized plus plug; The first testing circuit 104 is connected with control circuit 102, for detection of the voltage between zero line in circuit and ground wire during greater than the first predetermined threshold, produce the first control signal with control phase, zero, three-terminal polarized plus plug be in off-state; The second testing circuit 106 is connected with control circuit 102, for detection of the leakage current between phase line in circuit and zero line during greater than the second predetermined threshold, produce the second control signal with control phase, zero, three-terminal polarized plus plug be in off-state; Three testing circuit 108 is connected with control circuit 102, for detection of the leakage current of ground wire in circuit during greater than the 3rd predetermined threshold, produce the 3rd control signal with control phase, zero, three-terminal polarized plus plug be in off-state.
above-mentioned preferred embodiment in, a kind of leakage protecting plug is provided, comprise zero, phase, the ground three-terminal polarized plus plug, the built-in circuit of this plug inside can detect respectively voltage between zero ground, leakage current between phase zero and the leakage current on ground wire, when detecting voltage between zero ground and surpass predetermined safe voltage, perhaps the leakage current between phase zero is greater than predetermined safe current, when perhaps there is larger electric current in ground terminal, comprising of controller plug is zero, phase, ground three utmost points disconnect, the circuit of this structure can still move without ground wire or ground connection abnormal the time, and then reach the effect of electricity protection.
In addition, the utility model preferred embodiment provides a kind of preferred circuit theory diagrams of above-mentioned built-in circuit, as shown in Figure 2, the first testing circuit comprises: the first comparator U3, the first divider resistance R4, the second divider resistance R5, the first rectification triode D3 and the first filter capacitor C3, wherein, the first end of the first divider resistance R4 is connected with the zero utmost point of plug, the second end of the first divider resistance R4 is connected with the first end of the second divider resistance R5, and the second end of the second divider resistance R5 is connected with the earth polar of plug; The positive pole of the first rectification triode D3 is connected with the second end of the first divider resistance R4, and the negative pole of the first rectification triode D3 is connected with the first input end of the first comparator U3; The first end of the first filter capacitor C3 is connected with the negative pole of the first rectification triode D3, the second end ground connection of the first filter capacitor C3; The second input of the first comparator U3 respectively be connected the first end of reference voltage, the first current-limiting resistance R6 and connect, the second end ground connection of the first current-limiting resistance R6, the output of the first comparator U3 passes through or the first input end of logic gates is connected with the first end of controllable silicon SCR.
Wherein, the operation principle of above-mentioned the first testing circuit is as follows: the first reference voltage V ref obtains after by rectifier bridge and pressurizer U1 dividing potential drop, and preferred, the first reference voltage V ref is+5V.In case between zero ground, voltage is arranged, the upper voltage that produces of the second divider resistance R5 is connected to the in-phase input end of the first comparator U3 after the first rectification triode D3 rectification, when in-phase input end voltage during greater than inverting input the first reference voltage V ref1, the first comparator U3 output high level, otherwise, when in-phase input end voltage during less than inverting input the first reference voltage V ref1, the voltage comparator output low level.Preferably, in the electric operation process, in case zero ground voltage greater than 24V, the upper dividing potential drop that produces of R4 is greater than+5V, the first comparator U3 output high level triggers controllable silicon SCR, drives the release action, reaches the effect of protection.
As shown in Figure 2, the second testing circuit comprises: zero-sequence transformer L1, the second comparator U2, the second rectifier diode D2, the 3rd divider resistance R1, the 4th divider resistance R2, the second filter capacitor C1, the 3rd filter capacitor C2, wherein, the wire that connects phase line passes zero-sequence transformer L1 with the wire that is connected zero utmost point, the first output of zero-sequence transformer L1 is connected with the positive pole of the second rectifier diode D2, and the second output of zero-sequence transformer L1 is connected and ground connection with the second end of the second filter capacitor C1; The negative pole of the second rectifier diode D2 is connected with the first end of the 3rd divider resistance R1, and the second end of the 3rd divider resistance R1 is connected with the first input end of the second comparator U2; The second input of the second comparator U2 is connected with the first end of the second reference voltage, the second current-limiting resistance R12 respectively, the second end ground connection of the second current-limiting resistance R12, and the output of the second comparator U2 is connected with the first end of controllable silicon SCR; The first end of the 4th divider resistance R2 is connected with the second end of the 3rd divider resistance R1, and the second end of the 4th divider resistance R2 is connected and ground connection with the second end of the 3rd filter capacitor C2; The first end of the first end of the 3rd filter capacitor C2 and the 4th divider resistance R2 is connected in parallel; The first end of the first end of the second filter capacitor C1 and the 3rd divider resistance R1 is connected in parallel, and the second end of the second filter capacitor C1 is connected and ground connection with the second end of the 4th divider resistance R2.
Wherein, the operation principle of above-mentioned the second testing circuit is described below: the upper voltage that produces of the 4th divider resistance R2 is connected with the second comparator U2 in-phase input end, the second comparator U2 inverting input is connected with the second reference voltage V ref, and preferably, the second reference voltage V ref can adopt+5V.When the second comparator U2 in-phase input end voltage during greater than inverting input the second reference voltage V ref2, voltage comparator output high level, otherwise when in-phase input end voltage during less than inverting input Vref2, the second comparator U2 output low level, in case leakage current greater than 30mA, makes the upper dividing potential drop that produces of R2 greater than+5V, the second comparator U2 output high level, trigger controllable silicon SCR, drive the release action.
As shown in Figure 2, three testing circuit comprises: current transformer L2, the 3rd rectifier diode D4, the 5th divider resistance R8, the 6th divider resistance R9, the 4th filter capacitor C4, wherein, the wire that connects the earth polar passes current transformer L2, the first output of current transformer L2 is connected with the positive pole of the 3rd rectifier diode D4, and the second output of current transformer L2 is connected and ground connection with the second end of the 4th filter capacitor C4; The negative pole of the 3rd rectifier diode D4 is connected with the first end of the 5th divider resistance R8, and the second end of the 5th divider resistance R8 passes through or the second input of logic gates is connected with the first end of controllable silicon SCR; The first end of the 6th divider resistance R9 respectively with the second end of the 5th divider resistance R8 be connected the second input of logic gates and be connected, the second end of the 6th divider resistance R9 is connected with the second end of the 4th filter capacitor C4, and is connected in ground.
wherein, the operation principle of above-mentioned three testing circuit is described below: the three testing circuit output passes through or logic gates is connected with the controllable silicon trigger electrode, L2 level anode of current transformer is connected with the 3rd rectifier diode D4 is anodal, the 3rd rectifier diode D4 negative pole and divider resistance R8, R9 is connected, an input of the conduct of R9 front end or door, or the logic gates output is connected with controllable silicon, if leakage current is arranged on ground wire, current transformer produces induced current, produce dividing potential drop on R9, at it during greater than 0.7V, or door output high level, during less than 0.7V, or the door output level is controlled by zero ground voltage testing circuit.
As shown in Figure 2, above-mentioned control circuit comprises: rectification circuit D1, voltage stabilizing chip U1, controllable silicon SCR and release ZR, wherein, the first end of controllable silicon SCR is connected with the output of the first testing circuit, the second testing circuit and three testing circuit respectively, and the second end of controllable silicon SCR is connected with an end of release; The first end of rectification circuit is connected with the phase utmost point, the second end of rectification circuit be connected with the other end of release by voltage stabilizing chip U1.
In addition, the utility model also is optimized such scheme, particularly, on the basis of above-mentioned execution mode, has also increased hookup, is used for producing the 4th control signal to judge whether plug can carry out earth leakage protective by manual operation.Particularly, as shown in Figure 2, hookup comprises: push-button switch and the 3rd current-limiting resistance R7, and wherein, the first end of push-button switch is connected with the zero utmost point of plug, and the second end of push-button switch is connected with the first end of the 3rd current-limiting resistance R7; The second end of the 3rd current-limiting resistance R7 is connected with the phase utmost point of plug.Specifically; the user presses SW; can produce an electric current that is slightly larger than 30mA; cause release ZR protection; if can normally protect, press the Reset button, push-button switch SW disconnects; this leakage protecting plug can normally use, and whether this loop is used for detecting all-purpose leakage protection plug can regular event.By increasing the test loop, can make the user understand at any time leakage protecting plug and whether can work, guarantee safety utilization of electric power.
from above description, can find out, embodiment of the present utility model provides a kind of leakage protecting plug, comprise zero, phase, the ground three-terminal polarized plus plug, the built-in circuit of this plug inside can detect respectively voltage between zero ground, leakage current between phase zero and the leakage current on ground wire, when the voltage that detects between zero ground surpasses predetermined safe voltage, perhaps the leakage current between phase zero is greater than predetermined safe current, when perhaps there is larger electric current in ground terminal, comprising of controller plug is zero, phase, ground three utmost points disconnect, the circuit of this structure can still move without ground wire or ground connection abnormal the time, and then reach the effect of electricity protection.
The above is only preferred embodiment of the present utility model, is not limited to the utility model, and for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (7)
1. leakage protecting plug, comprise plug body, built-in circuit with mutually, zero, three-terminal polarized plus plug, it is characterized in that, described built-in circuit comprises:
Control circuit, be used for controlling described phase, zero, disconnection and the closure of three-terminal polarized plus plug;
The first testing circuit is connected with described control circuit, for detection of the voltage between zero line in circuit and ground wire during greater than the first predetermined threshold, produce the first control signal with control described phase, zero, three-terminal polarized plus plug be in off-state;
The second testing circuit is connected with described control circuit, for detection of the leakage current between phase line in circuit and zero line during greater than the second predetermined threshold, produce the second control signal with control described phase, zero, three-terminal polarized plus plug be in off-state;
Three testing circuit is connected with described control circuit, for detection of the leakage current of ground wire in circuit during greater than the 3rd predetermined threshold, produce the 3rd control signal with control described phase, zero, three-terminal polarized plus plug be in off-state.
2. plug according to claim 1, is characterized in that, described control circuit comprises: rectification circuit, voltage stabilizing chip (U1), controllable silicon (SCR) and release, wherein,
The first end of described controllable silicon (SCR) is connected with described the first testing circuit, described the second testing circuit and the output of three testing circuit of being connected respectively, and the second end of described controllable silicon (SCR) is connected with an end of described release;
The first end of described rectification circuit is connected with the described phase utmost point, the second end of described rectification circuit be connected with the other end of described release by described voltage stabilizing chip (U1).
3. plug according to claim 2, it is characterized in that, described the first testing circuit comprises: the first comparator (U3), the first divider resistance (R4), the second divider resistance (R5), the first rectification triode (D3) and the first filter capacitor (C3), wherein
The first end of described the first divider resistance (R4) is connected with the zero utmost point of described plug, the second end of described the first divider resistance (R4) is connected with the first end of described the second divider resistance (R5), and the second end of described the second divider resistance (R5) is connected with the earth polar of described plug;
The positive pole of described the first rectification triode (D3) is connected with the second end of described the first divider resistance (R4), and the negative pole of described the first rectification triode (D3) is connected with the first input end of described the first comparator (U3);
The first end of described the first filter capacitor (C3) is connected with the negative pole of described the first rectification triode (D3), the second end ground connection of described the first filter capacitor (C3);
The second input of described the first comparator (U3) respectively be connected the first end of reference voltage, the first current-limiting resistance (R6) and connect, the second end ground connection of described the first current-limiting resistance (R6), the output of described the first comparator (U3) passes through or the first input end of logic gates is connected with the first end of described controllable silicon (SCR).
4. plug according to claim 3, it is characterized in that, described the second testing circuit comprises: zero-sequence transformer (L1), the second comparator (U2), the second rectifier diode (D2), the 3rd divider resistance (R1), the 4th divider resistance (R2), the second filter capacitor (C1), the 3rd filter capacitor (C2), wherein
The wire that connects the described phase utmost point passes described zero-sequence transformer (L1) with the wire that is connected described zero utmost point, the first output of described zero-sequence transformer (L1) is connected with the positive pole of described the second rectifier diode (D2), and the second output of described zero-sequence transformer (L1) is connected and ground connection with the second end of described the second filter capacitor (C1);
The negative pole of described the second rectifier diode (D2) is connected with the first end of described the 3rd divider resistance (R1), and the second end of described the 3rd divider resistance (R1) is connected with the first input end of described the second comparator (U2);
The second input of described the second comparator (U2) is connected with the first end of the second reference voltage, the second current-limiting resistance (R12) respectively, the second end ground connection of described the second current-limiting resistance (R12), the output of described the second comparator (U2) is connected with the first end of described controllable silicon (SCR);
The first end of described the 4th divider resistance (R2) is connected with the second end of described the 3rd divider resistance (R1), and the second end of described the 4th divider resistance (R2) is connected and ground connection with the second end of described the 3rd filter capacitor (C2);
The first end of the first end of described the 3rd filter capacitor (C2) and described the 4th divider resistance (R2) is connected in parallel;
The first end of the first end of described the second filter capacitor (C1) and described the 3rd divider resistance (R1) is connected in parallel,
The second end of described the second filter capacitor (C1) is connected and ground connection with the second end of described the 4th divider resistance (R2).
5. plug according to claim 4, it is characterized in that, described three testing circuit comprises: current transformer (L2), the 3rd rectifier diode (D4), the 5th divider resistance (R8), the 6th divider resistance (R9), the 4th filter capacitor (C4), wherein
The wire that connects described earth polar passes described current transformer (L2), the first output of described current transformer (L2) is connected with the positive pole of described the 3rd rectifier diode (D4), and the second output of described current transformer (L2) is connected and ground connection with the second end of the 4th filter capacitor (C4);
The negative pole of described the 3rd rectifier diode (D4) is connected with the first end of described the 5th divider resistance (R8), and the second end of described the 5th divider resistance (R8) is connected with the first end of described controllable silicon (SCR) by the second input of described or logic gates;
The first end of described the 6th divider resistance (R9) respectively with the second end of described the 5th divider resistance (R8) be connected or the second input of logic gates is connected, the second end of described the 6th divider resistance (R9) is connected with the second end of described the 4th filter capacitor (C4), and is connected in ground.
6. plug according to claim 5, is characterized in that, also comprises: hookup is used for producing the 4th control signal to judge whether described plug can carry out earth leakage protective by manual operation.
7. plug according to claim 6, is characterized in that, described hookup comprises: push-button switch and the 3rd current-limiting resistance (R7), wherein,
The first end of described push-button switch is connected with the zero utmost point of described plug, and the second end of described push-button switch is connected with the first end of described the 3rd current-limiting resistance (R7);
The second end of described the 3rd current-limiting resistance (R7) is connected with the phase utmost point of described plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220610931 CN202940393U (en) | 2012-11-16 | 2012-11-16 | Electric leakage protection plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220610931 CN202940393U (en) | 2012-11-16 | 2012-11-16 | Electric leakage protection plug |
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| Publication Number | Publication Date |
|---|---|
| CN202940393U true CN202940393U (en) | 2013-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220610931 Expired - Fee Related CN202940393U (en) | 2012-11-16 | 2012-11-16 | Electric leakage protection plug |
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| CN (1) | CN202940393U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901089A (en) * | 2015-05-13 | 2015-09-09 | 佛山市顺德区信辉达电子有限公司 | Switching voltage type leakage protection plug |
| CN104967322A (en) * | 2014-11-28 | 2015-10-07 | 成都雷克尔科技有限公司 | Logic protection emitter coupling-type three-filtering nonlinear negative feedback switching voltage-stabilizing power supply |
-
2012
- 2012-11-16 CN CN 201220610931 patent/CN202940393U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967322A (en) * | 2014-11-28 | 2015-10-07 | 成都雷克尔科技有限公司 | Logic protection emitter coupling-type three-filtering nonlinear negative feedback switching voltage-stabilizing power supply |
| CN104901089A (en) * | 2015-05-13 | 2015-09-09 | 佛山市顺德区信辉达电子有限公司 | Switching voltage type leakage protection plug |
| CN104901089B (en) * | 2015-05-13 | 2017-07-14 | 佛山市顺德区信辉达电子有限公司 | Change voltage-type leakage protecting plug |
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Granted publication date: 20130515 Termination date: 20211116 |
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