CN203551689U - A current surge protector piezoresistor deterioration early warning circuit and an apparatus - Google Patents
A current surge protector piezoresistor deterioration early warning circuit and an apparatus Download PDFInfo
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- CN203551689U CN203551689U CN201320640142.5U CN201320640142U CN203551689U CN 203551689 U CN203551689 U CN 203551689U CN 201320640142 U CN201320640142 U CN 201320640142U CN 203551689 U CN203551689 U CN 203551689U
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Abstract
The utility model belongs to the field of current surge protectors, and provides a current surge protector piezoresistor deterioration early warning circuit and an apparatus. According to the utility model, interference signals in an alternating current are filtered out through a rectification filtering module and a stable direct current is provided for driving an early warning indication module to work; and the early warning control module controls indication states of the early warning indication module to change according to changes of a current output by a piezoresistor. According to the utility model, deterioration indications of the current surge protector piezoresistor are provided, and the reliability is higher through the utilization of current output characteristics of the piezoresistor as a deterioration determination standard.
Description
Technical field
The utility model belongs to surge protector field, relates in particular to the deteriorated early warning circuit of a kind of surge protector voltage dependent resistor (VDR) and device.
Background technology
Development along with infotech; for lightning protection demand, day by day increase; surge protector is widely used at important places such as mansions, but present stage take surge protector that Zinc-oxide piezoresistor is main devices because voltage dependent resistor (VDR) MOV is easily deteriorated, cause fire failure to take place frequently.
In order to prevent the deteriorated security incident that causes of voltage dependent resistor (VDR) MOV, domestic production surge protector manufacturer carries out deteriorated indication to the deterioration state of voltage dependent resistor (VDR) MOV, to change in time surge protector or voltage dependent resistor (VDR) MOV occurs with Accident prevention, due to the first deteriorated index of voltage dependent resistor (VDR) MOV: the same loop of leakage current and discharge channel, there is technical bottleneck, part producer adopts the heating temp of voltage dependent resistor (VDR) MOV is gathered and analyze its degradation of indication, there is certain advance, but reliability is poor, can not fundamentally solve the fire hazard of voltage dependent resistor (VDR) MOV after deteriorated, the miniaturization voltage dependent resistor (VDR) MOV of some producer, and a plurality of matrix circuits are set in surge protector, the voltage dependent resistor (VDR) MOV inefficacy institute energy requirement in each loop is reduced, thereby reduce the probability that thunder and lightning initiation fire occurs, and voltage dependent resistor (VDR) MOV is not carried out to deteriorated indication, the deteriorated indication reality of surge protector voltage dependent resistor (VDR) MOV of major part producer design is Indication of Losing Efficacy and the indication of threading off, and is not deteriorated indication truly, has certain limitation.
Utility model content
The utility model provides a kind of surge protector voltage dependent resistor (VDR) deteriorated early warning circuit; be intended to solve in existing surge protector the temperature of voltage dependent resistor (VDR) is sampled to judge that its degradation reliability is low, and in surge protector, design a plurality of matrix circuits and but do not possess the problem of deixis to reduce the voltage dependent resistor (VDR) MOV required energy that lost efficacy.
In order to solve the problems of the technologies described above; the utility model is achieved in that the deteriorated early warning circuit of a kind of surge protector voltage dependent resistor (VDR); be connected with surge protector; described surge protector is connected with ground with alternating current; described surge protector comprises voltage dependent resistor (VDR), and the deteriorated early warning circuit of described surge protector voltage dependent resistor (VDR) comprises:
Input end is connected with alternating current, and the undesired signal described in filtering in alternating current is also converted into galvanic rectification filtering module by described alternating current;
First input end is connected with described surge protector, in described voltage dependent resistor (VDR), the forewarn module of forewarn signal occurs to export when deteriorated;
Input end is connected with the output terminal of described rectification filtering module, output terminal is connected with the earth terminal of described rectification filtering module, control end is connected with described forewarn module, sends the early warning indicating module of the deteriorated warning indication of voltage dependent resistor (VDR) according to described forewarn signal;
Input end grounding, output terminal is connected with the second input end of described forewarn module, the diverter module that suppresses lightning surge electric current and the leakage current of described voltage dependent resistor (VDR) generation is shunted.
Further, described rectification filtering module comprises:
Filter capacitor C1, the first resistance R 1, the first rectifier bridge BD1;
The first end of described filter capacitor C1 is that the first input end of described rectification filtering module and the live wire end of described alternating current are connected, the second end of described filter capacitor C1 is connected with the first input end of described the first rectifier bridge BD1, the second input end of described the first rectifier bridge BD1 is connected with the first end of described the first resistance R 1, the second input end that the second end of described the first resistance R 1 is described rectification filtering module is connected with the zero line side of described alternating current, the output terminal that the output terminal of described the first rectifier bridge BD1 is described rectification filtering module.
Further, described early warning indicating module comprises:
Relay K 1, the first voltage stabilizing diode DW1, the first LED 1, the second LED 2, the first polar capacitor C2, the second resistance R 2, photoelectrical coupler U1;
The Chang Kaiduan of described relay K 1, in the anode of described polar capacitor C2 and described photoelectrical coupler U1, the public connecting end of the input end of light-receiving device is the input end of described early warning indicating module, the normal-closed end of described relay K 1 is connected with the negative electrode of described the first zener diode DW1, the anodic bonding of the anode of described the first voltage stabilizing diode DW1 and described the first LED 1, in described photoelectrical coupler U1, the output terminal of light-receiving device and the anode of described the second LED 2 are connected with the first end of described the second resistance R 2, the negative electrode of described the first LED 1, the negative electrode of described the first polar capacitor C2, the public connecting end of the second end of the negative electrode of described the second LED 2 and described the second resistance R 2 is the output terminal of described early warning indicating module.
Further, described forewarn module comprises:
The second rectifier bridge BD2, the 3rd resistance R 3, the second polar capacitor C3;
The first input end of described the second rectifier bridge BD2 is the first input end of described forewarn module, the second input end of described the second rectifier bridge BD2 is the second input end of described forewarn module, the first end of the output terminal of described the second rectifier bridge BD2 and described the 3rd resistance R 3, the anodic bonding of light emitting diode in the anode of described the second polar capacitor C3 and described photoelectrical coupler U1, the negative electrode of light emitting diode in described photoelectrical coupler U1, the second end of the negative electrode of described the second polar capacitor C3 and described the 3rd resistance R 3 is connected with the earth terminal of described the second rectifier bridge BD2.
Further, described surge protector also comprises:
Fuse F, discharge tube GDT;
The first end of described fuse F is connected with the live wire end of described alternating current, the second end of described fuse F is connected with the first end of described voltage dependent resistor (VDR), the second end of described voltage dependent resistor (VDR) is connected with the first end of described discharge tube GDT, the second end ground connection of described discharge tube GDT.
Further, described diverter module comprises:
The second voltage stabilizing diode DW2, the 3rd voltage stabilizing diode DW3, the 4th resistance R 4;
The first end of described the 4th resistance R 4 is the output terminal of described diverter module, the second end of described the 4th resistance R 4 and the anodic bonding of described the 3rd zener diode DW3, the negative electrode of described the 3rd zener diode DW3 is connected with the negative electrode of described voltage stabilizing diode DW2, the input end that the anode of described the second voltage stabilizing diode DW2 is described diverter module.
The utility model also provides a kind of surge protector voltage dependent resistor (VDR) deteriorated prior-warning device, and the deteriorated prior-warning device of described surge protector voltage dependent resistor (VDR) comprises the deteriorated early warning circuit of surge protector voltage dependent resistor (VDR) as above.
In the utility model; by the undesired signal in rectification filtering module filtering alternating current and provide galvanic current to drive early warning indicating module to work; the indicating status that forewarn module is controlled described early warning indicating module according to the variation of voltage dependent resistor (VDR) output current changes, and the deteriorated indication of surge protector voltage dependent resistor (VDR) and higher as the standard reliability of deteriorated judgement according to the electric current output characteristics of voltage dependent resistor (VDR) is provided in the utility model.
Accompanying drawing explanation
Fig. 1 is the modular structure figure of the deteriorated early warning circuit of surge protector voltage dependent resistor (VDR) that provides of the utility model embodiment;
Fig. 2 is the circuit structure diagram of the deteriorated early warning circuit of surge protector voltage dependent resistor (VDR) that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Below in conjunction with specific embodiment, specific implementation of the present utility model is described in detail:
Fig. 1 shows the modular structure of the deteriorated early warning circuit of surge protector voltage dependent resistor (VDR) that the utility model embodiment provides, and for convenience of explanation, only lists the part relevant to the utility model embodiment, and details are as follows:
As shown in Figure 1; the deteriorated early warning circuit 100 of surge protector voltage dependent resistor (VDR) that the utility model embodiment provides is connected with surge protector 200; surge protector 200 is connected with ground with the live wire end L of alternating current; surge protector 200 comprises voltage dependent resistor (VDR) MOV, and the deteriorated early warning circuit 100 of surge protector voltage dependent resistor (VDR) comprises:
Input end is connected with alternating current, and the undesired signal in filtering alternating current is also converted into galvanic rectification filtering module 101 by this alternating current;
First input end is connected with surge protector 200, voltage dependent resistor (VDR) MOV occur to export when deteriorated forewarn signal forewarn module 103;
Input end is connected with the output terminal of rectification filtering module 101, output terminal is connected with the earth terminal of rectification filtering module 101, control end is connected with forewarn module 103, sends the early warning indicating module 102 of the deteriorated warning indication of voltage dependent resistor (VDR) according to this forewarn signal;
Input end grounding, output terminal is connected with the second input end of forewarn module 103, the diverter module 104 that suppresses lightning surge electric current and the leakage current of voltage dependent resistor (VDR) MOV generation is shunted.
Fig. 2 shows the circuit structure of the deteriorated early warning circuit of surge protector voltage dependent resistor (VDR) that the utility model embodiment provides, and for convenience of explanation, only lists the part relevant to the utility model embodiment, and details are as follows:
As shown in Figure 2, as the utility model one embodiment, rectification filtering module 101 comprises:
Filter capacitor C1, the first resistance R 1, the first rectifier bridge BD1;
The first end of filter capacitor C1 is that the first input end of rectification filtering module 101 and the live wire end L of alternating current are connected, the second end of filter capacitor C1 is connected with the first input end of the first rectifier bridge BD1, the second input end of the first rectifier bridge BD1 is connected with the first end of the first resistance R 1, the second end of the first resistance R 1 is that the second input end of rectification filtering module 101 and the zero line side N of alternating current are connected, and the output terminal of the first rectifier bridge BD1 is the output terminal of rectification filtering module 101.
In the utility model embodiment, filter capacitor C1 not only has the effect of filtering, can also stablize the DC current of rectifier bridge BD1 output, and rectification filtering module 101 also has the effect of steady current.
As the utility model one embodiment, early warning indicating module 102 comprises:
Relay K 1, the first voltage stabilizing diode DW1, the first LED 1, the second LED 2, the first polar capacitor C2, the second resistance R 2, photoelectrical coupler U1;
The Chang Kaiduan NO of relay K 1, in the anode of polar capacitor C2 and photoelectrical coupler U1, the public connecting end of the input end of light-receiving device is the input end of early warning indicating module 102, the normal-closed end NC of relay K 1 is connected with the negative electrode of the first zener diode DW1, the anodic bonding of the anode of the first voltage stabilizing diode DW1 and the first LED 1, in photoelectrical coupler U1, the output terminal of light-receiving device is connected with the first end of the second resistance R 2 with the anode of the second LED 2, the negative electrode of the first LED 1, the negative electrode of the first polar capacitor C2, the public connecting end of the second end of the negative electrode of the second LED 2 and the second resistance R 2 is the output terminal of early warning indicating module 102.
As the utility model one embodiment, forewarn module 103 comprises:
The second rectifier bridge BD2, the 3rd resistance R 3, the second polar capacitor C3;
The first input end of the second rectifier bridge BD2 is the first input end of forewarn module 103, the second input end of the second rectifier bridge BD2 is the second input end of forewarn module 103, the anodic bonding of light emitting diode in the anode of the first end of the output terminal of the second rectifier bridge BD2 and the 3rd resistance R 3, the second polar capacitor C3 and photoelectrical coupler U1, in photoelectrical coupler U1, the second end of the negative electrode of the negative electrode of light emitting diode, the second polar capacitor C3 and the 3rd resistance R 3 is connected with the earth terminal of the second rectifier bridge BD2.
As the utility model one embodiment, surge protector 200 also comprises:
Fuse F, discharge tube GDT;
The first end of fuse F is connected with the live wire end L of alternating current, and the second end of fuse F is connected with the first end of voltage dependent resistor (VDR) MOV, and the second end of voltage dependent resistor (VDR) MOV is connected with the first end of discharge tube GDT, the second end ground connection of discharge tube GDT.
As the utility model one embodiment, diverter module 104 comprises:
The second voltage stabilizing diode DW2, the 3rd voltage stabilizing diode DW3, the 4th resistance R 4;
The first end of the 4th resistance R 4 is the output terminal of diverter module 104, the second end of the 4th resistance R 4 and the anodic bonding of the 3rd zener diode DW3, the negative electrode of the 3rd zener diode DW3 is connected with the negative electrode of voltage stabilizing diode DW2, and the anode of the second voltage stabilizing diode DW2 is the input end of diverter module 104.
The principle of work of the deteriorated early warning circuit of surge protector voltage dependent resistor (VDR) below the utility model embodiment being provided describes.
Capacitor C 1 is on the first input end of the first rectifier bridge BD1 and the live wire end L of alternating current, and filter capacitor C1 capacitance size is controlled size of current, harmonic wave and subharmonic that the first resistance R 1 suppresses in alternating current circuit, and the first rectifier bridge BD1 transfers alternating current to direct current.Fuse F series connection voltage dependent resistor (VDR) MOV again discharged in series pipe GDT forms surge protection loop, and fuse F plays dropout effect, and voltage dependent resistor (VDR) MOV and discharge tube GDT play the surge effect of releasing.
As shown in Figure 2, the second voltage stabilizing diode DW2 and the 3rd voltage stabilizing diode DW3 as figure docking after connecting, connect again the 4th resistance R 4 be connected to the second rectifier bridge BD2 the second input end and between, bypass as discharge tube GDT, the second voltage stabilizing diode DW2 and the 3rd voltage stabilizing diode DW3 stabilizing glow tube GDT both end voltage (180V) and voltage dependent resistor (VDR) MOV both end voltage (220V-180V), the required electric current of voltage stabilizing divides two parts, one is the static leakage current that voltage dependent resistor (VDR) MOV produces, its two interelectrode capacity existing for voltage dependent resistor (VDR) MOV is connected on the induction current Ic producing in interchange, minimum work of static leakage current that voltage dependent resistor (VDR) MOV produces under fine status considered, only consider that voltage dependent resistor (VDR) MOV interelectrode capacity is connected on the induction current Ic producing in alternating current.
Because discharge tube GDT is as gas resistance infinity, two kinds of electric currents (static leakage current and induction current) that voltage dependent resistor (VDR) MOV produces can only be by the bypass (branch road that the 4th resistance R 4, the second voltage stabilizing diode DW2 and the 3rd voltage stabilizing diode DW3 form, be diverter module 104), the 4th resistance R 4 suppresses from then on bypass of lightning surge electric current (diverter module) and passes through, therefore pressure stabilization function had both been played in bypass, played again shunting (voltage dependent resistor (VDR) MOV produces) leakage current effect.
Photoelectrical coupler U1 and the 3rd resistance R 3 and the second polar capacitor C3 are connected in parallel between the output and ground of the second rectifier bridge BD2, the electric current at the output and ground two ends of smooth the second rectifier bridge BD2 of the second polar capacitor C3, the 3rd resistance R 3 is controlled the voltage at light emitting diode two ends in photoelectrical coupler U1, under voltage dependent resistor (VDR) MOV serviceable condition, the electric current that voltage dependent resistor (VDR) MOV produces passes through from the 3rd resistance R 3, the 3rd resistance R 3 both end voltage are less than the trigger voltage of light emitting diode in photoelectrical coupler U1, and photoelectrical coupler U1 does not work.
Relay K 1 series connection the first stabilivolt DW1 connects the first LED 1 composition voltage dependent resistor (VDR) MOV more normally without deteriorated indication loop, the light-receiving device of photoelectrical coupler U1 is connected on the deteriorated indication of the voltage dependent resistor (VDR) MOV loop that the second LED 2 forms, the second LED 2 the second resistance R 2 in parallel, voltage dependent resistor (VDR) MOV is intact without under deterioration state, photoelectrical coupler U1 does not start, in photoelectrical coupler U1, the resistance of light-receiving device reaches mega-ohms, only have minimum electric current to pass through from the deteriorated indication of voltage dependent resistor (VDR) MOV loop, cause is minimum by the electric current in the deteriorated indication of voltage dependent resistor (VDR) MOV loop, do not reach LED 2 and start required voltage, therefore, this minimum electric current passes through from the second resistance R 2, voltage dependent resistor (VDR) MOV is normal bright without the first LED 1 in deteriorated indication loop, represent that voltage dependent resistor (VDR) MOV is without deteriorated.
When voltage dependent resistor (VDR) MOV is deteriorated, the leakage current that voltage dependent resistor (VDR) MOV produces is larger, photoelectrical coupler U1 starts, lumination of light emitting diode in photoelectrical coupler U1, light-receiving device resistance step-down in photoelectrical coupler U1, drag down the voltage at the output and ground two ends of the first rectifier bridge BD1, voltage dependent resistor (VDR) MOV normally reduces without deteriorated indication loop current, do not reach the trigger voltage of the first LED 1, the first LED 1 extinguishes, relay K 1 is sent distant news signal, in the deteriorated indication of voltage dependent resistor (VDR) MOV loop, the second LED 2 is lighted, represent that voltage dependent resistor (VDR) MOV is in deterioration state.
The utility model embodiment also provides a kind of surge protector voltage dependent resistor (VDR) deteriorated prior-warning device, and the deteriorated prior-warning device of this surge protector voltage dependent resistor (VDR) comprises the deteriorated early warning circuit 100 of above-mentioned surge protector voltage dependent resistor (VDR).
In the utility model embodiment; by the undesired signal in rectification filtering module filtering alternating current and provide galvanic current to drive early warning indicating module to work; the indicating status that forewarn module is controlled described early warning indicating module according to the variation of voltage dependent resistor (VDR) output current changes, and the deteriorated indication of surge protector voltage dependent resistor (VDR) and higher as the standard reliability of deteriorated judgement according to the electric current output characteristics of voltage dependent resistor (VDR) is provided in the utility model.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (7)
1. the deteriorated early warning circuit of surge protector voltage dependent resistor (VDR); be connected with surge protector, described surge protector is connected with ground with alternating current, and described surge protector comprises voltage dependent resistor (VDR); it is characterized in that, the deteriorated early warning circuit of described surge protector voltage dependent resistor (VDR) comprises:
Input end is connected with alternating current, and the undesired signal described in filtering in alternating current is also converted into galvanic rectification filtering module by described alternating current;
First input end is connected with described surge protector, in described voltage dependent resistor (VDR), the forewarn module of forewarn signal occurs to export when deteriorated;
Input end is connected with the output terminal of described rectification filtering module, output terminal is connected with the earth terminal of described rectification filtering module, control end is connected with described forewarn module, sends the early warning indicating module of the deteriorated warning indication of voltage dependent resistor (VDR) according to described forewarn signal;
Input end grounding, output terminal is connected with the second input end of described forewarn module, the diverter module that suppresses lightning surge electric current and the leakage current of described voltage dependent resistor (VDR) generation is shunted.
2. the deteriorated early warning circuit of surge protector voltage dependent resistor (VDR) as claimed in claim 1, is characterized in that, described rectification filtering module comprises:
Filter capacitor C1, the first resistance R 1, the first rectifier bridge;
The first end of described filter capacitor C1 is that the first input end of described rectification filtering module and the live wire end of described alternating current are connected, the second end of described filter capacitor C1 is connected with the first input end of described the first rectifier bridge, the second input end of described the first rectifier bridge is connected with the first end of described the first resistance R 1, the second input end that the second end of described resistance R 1 is described rectification filtering module is connected with the zero line side of described alternating current, the output terminal that the output terminal of described the first rectifier bridge is described rectification filtering module.
3. the deteriorated early warning circuit of surge protector voltage dependent resistor (VDR) as claimed in claim 1, is characterized in that, described early warning indicating module comprises:
Relay, the first voltage stabilizing diode, the first light emitting diode, the second light emitting diode, the first polar capacitor C2, the second resistance R 2, photoelectrical coupler;
The Chang Kaiduan of described relay, in the anode of described polar capacitor C2 and described photoelectrical coupler, the public connecting end of the input end of light-receiving device is the input end of described early warning indicating module, the normal-closed end of described relay is connected with the negative electrode of described the first zener diode, the anodic bonding of the anode of described the first voltage stabilizing diode and described the first light emitting diode, in described photoelectrical coupler, the output terminal of light-receiving device is connected with the first end of described the second resistance R 2 with the anode of described the second light emitting diode, the negative electrode of described the first light emitting diode, the negative electrode of described the first polar capacitor C2, the public connecting end of the second end of the negative electrode of described the second light emitting diode and described the second resistance R 2 is the output terminal of described early warning indicating module.
4. the deteriorated early warning circuit of surge protector voltage dependent resistor (VDR) as claimed in claim 3, is characterized in that, described forewarn module comprises:
The second rectifier bridge, the 3rd resistance R 3, the second polar capacitor C3;
The first input end of described the second rectifier bridge is the first input end of described forewarn module, the second input end of described the second rectifier bridge is the second input end of described forewarn module, the anodic bonding of light emitting diode in the anode of the first end of the output terminal of described the second rectifier bridge and described the 3rd resistance R 3, described the second polar capacitor C3 and described photoelectrical coupler, in described photoelectrical coupler, the second end of the negative electrode of the negative electrode of light emitting diode, described the second polar capacitor C3 and described the 3rd resistance R 3 is connected with the earth terminal of described the second rectifier bridge.
5. the deteriorated early warning circuit of surge protector voltage dependent resistor (VDR) as claimed in claim 1, is characterized in that, described surge protector also comprises:
Fuse, discharge tube;
The first end of described fuse is connected with the live wire end of described alternating current, and the second end of described fuse is connected with the first end of described voltage dependent resistor (VDR), and the second end of described voltage dependent resistor (VDR) is connected with the first end of described discharge tube, the second end ground connection of described discharge tube.
6. the deteriorated early warning circuit of surge protector voltage dependent resistor (VDR) as claimed in claim 1, is characterized in that, described diverter module comprises:
The second voltage stabilizing diode, the 3rd voltage stabilizing diode, the 4th resistance R 4;
The first end of described the 4th resistance R 4 is the output terminal of described diverter module, the second end of described the 4th resistance R 4 and the anodic bonding of described the 3rd zener diode, described the 3rd negative electrode of zener diode and the negative electrode of described voltage stabilizing diode are connected, the input end that the anode of described the second voltage stabilizing diode is described diverter module.
7. the deteriorated prior-warning device of surge protector voltage dependent resistor (VDR), is characterized in that, the deteriorated prior-warning device of described surge protector voltage dependent resistor (VDR) comprises the deteriorated early warning circuit of surge protector voltage dependent resistor (VDR) as described in as arbitrary in claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320640142.5U CN203551689U (en) | 2013-10-16 | 2013-10-16 | A current surge protector piezoresistor deterioration early warning circuit and an apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320640142.5U CN203551689U (en) | 2013-10-16 | 2013-10-16 | A current surge protector piezoresistor deterioration early warning circuit and an apparatus |
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| Publication Number | Publication Date |
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| CN203551689U true CN203551689U (en) | 2014-04-16 |
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| CN201320640142.5U Withdrawn - After Issue CN203551689U (en) | 2013-10-16 | 2013-10-16 | A current surge protector piezoresistor deterioration early warning circuit and an apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569636A (en) * | 2013-10-16 | 2015-04-29 | 深圳市威尔利实业有限公司 | Circuit and device for early warning degradation of MOV (metal oxide varistor) of surge protection device |
-
2013
- 2013-10-16 CN CN201320640142.5U patent/CN203551689U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569636A (en) * | 2013-10-16 | 2015-04-29 | 深圳市威尔利实业有限公司 | Circuit and device for early warning degradation of MOV (metal oxide varistor) of surge protection device |
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Granted publication date: 20140416 Effective date of abandoning: 20180427 |