CN203350380U - Residual current protection test circuit - Google Patents
Residual current protection test circuit Download PDFInfo
- Publication number
- CN203350380U CN203350380U CN 201320467288 CN201320467288U CN203350380U CN 203350380 U CN203350380 U CN 203350380U CN 201320467288 CN201320467288 CN 201320467288 CN 201320467288 U CN201320467288 U CN 201320467288U CN 203350380 U CN203350380 U CN 203350380U
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- resistance
- capacitor
- operational amplifier
- residual current
- circuit
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Abstract
The utility model relates to a circuit, in particular to a residual current protection test circuit in a residual current protection device. The technical scheme of the utility model is that the residual current protection test circuit is characterized by comprising a test button S1, an operational amplifier U1, a Wien-bridge circuit, an output circuit and a current transformer CT, wherein the Wien-bridge circuit comprises a resistor R7, a resistor R8, a capacitor C2 and a capacitor C3. By the above scheme, the residual current protection test circuit of the utility model solves the problems existing in the prior art, and provides a novel residual current protection test circuit which utilizes a sine wave oscillation circuit to simulate and output an electric leakage test signal, is high in circuit reliability and low in power consumption, is not influenced by the open-phase and undervoltage of a three-phase power supply, is supplied with power by a low-voltage power supply, and avoids the problems that the large-power voltage dropping resistors are easy to heat and are easy to damage.
Description
Technical field
The utility model relates to a kind of circuit, particularly with the hookup of the residual current protecting in Aftercurrent protecting equipment.
Background technology
Device with residual current protecting generally need to possess hookup, and whether the user can understand the residual current protecting function of device by hookup normal, to prevent from getting an electric shock and personal injury significant.
With all power takings from the two-phase of three-phase supply or three-phase of the hookup of residual current protecting, be connected to the testing coil of residual current transformer by the form of resistance step-down serial connection test button at present.As shown in Figure 1.If in this design, L1 and L2 appoint scarce one all can cause the hookup disabler mutually, resistance R 1 and R2 are all used the resistance of tens kilo-ohms, 1 watt, by test button resistance, easily generate heat for a long time, may cause burn-out resistance, and because this hookup power supply is connected to the three-phase supply place, supply voltage is high, need to take into full account the problem of electric clearance during the designed lines plate.
The patent of " a kind of residual current protecting hookup " that the patent No. is 200610073996.4, press test button in this design circuit, and it is square wave that oscillatory circuit produces signal, and the sine wave in using with reality is inconsistent.
Summary of the invention
The utility model overcomes the problem that prior art exists, and a kind of employing sine wave oscillation circuit simulation output leak(age) test signal is provided, and circuit reliability is high, is not subject to open phases of three-phase power source, under-voltage impact; Adopt in addition LVPS power supply, low in energy consumption, avoided the hookup of the novel residual current protecting of heating because using the high-power resistance step-down to bring and the flimsy problem of power resistor.
In order to realize above purpose, the utility model is by the following technical solutions: a kind of residual current protecting hookup, it is characterized in that: include test button S1, operational amplifier U1, Wien Bridge Circuit, output circuit summation current transformer CT, wherein test button S1 mono-end connects the access power supply, the other end is by ground connection after resistance R 2 and R6, export a signal by connecting biasing resistor R3 between resistance R 2 and R6, the R3 other end is connected to the inverting input of operational amplifier U1 input end, described Wien Bridge Circuit includes resistance R 7, resistance R 8, capacitor C 2 and capacitor C 3, wherein resistance R 7 is in parallel with capacitor C 3, resistance R 7 all is connected on the pressure-dividing output voltage of resistance R 2 and biasing resistor R6 with the front end of capacitor C 3, resistance R 7 be divided into two-way after capacitor C 3 is in parallel, one road is connected on the in-phase input end of operational amplifier U1 input end, after the upper electric capacity C2 of another road series connection and resistance R 8, be connected on operational amplifier U1 output terminal, described output circuit includes capacitor C 1 and resistance R 4, output circuit one end is connected on operational amplifier U1 output terminal, the other end is connected on Current Transmit.
By adopting such scheme, this product lack any one mutually in the three-phase three-wire system power supply or lack any phase in the three-phase four-wire system power supply, two-phase all can work, and all can not produce because dropping resistor burns the test function caused and lose by test button for a long time, improve the reliability of product.The design has reduced power consumption and the temperature rise of circuit simultaneously, uses low supply voltage to be more conducive to the Miniaturization Design of product.
Further setting of the present utility model is: between the reverse input end of described operational amplifier U1 input end and operational amplifier U1 output terminal, be connected with biasing resistor R1; Be in series with capacitor C 1 and resistance R 4 on described operational amplifier U1 output terminal.
By adopting such scheme, be to further refinement of the present utility model, can effectively solve the problem that the hookup that causes because of power phase shortage in hookup as shown in Figure 1 lost efficacy.Also solve resistance in Fig. 1 circuit and, because connecting when high voltage is selected high-power resistance and wiring board design the problem that takes into full account electric clearance, be more conducive to low-power consumption, the Miniaturization Design of wiring board.Owing to adopting sine wave signal output, conventional practical application is more pressed close in the square wave output in the Patent design of " a kind of residual current protecting hookup " that is 200610073996.4 than the patent No..
Below in conjunction with accompanying drawing, the utility model is described in further detail.
The accompanying drawing explanation
Fig. 1 is the background technology circuit diagram;
Fig. 2 is the circuit diagram of the utility model embodiment.
Embodiment
As shown in Figure 2; a kind of residual current protecting hookup; include test button S1, operational amplifier U1, Wien Bridge Circuit, output circuit summation current transformer CT; wherein test button S1 mono-end connects the access electric signal; the other end is by ground connection after resistance R 2 and R6; wherein resistance R 2 and R6 form biasing circuit, for sine wave oscillation circuit provides bias voltage.Export a signal by connecting biasing resistor R3 between resistance R 2 and R6, the biasing resistor R3 other end is connected on the reverse input end of operational amplifier U1, described Wien Bridge Circuit includes resistance R 7, resistance R 8, capacitor C 2 and capacitor C 3, wherein resistance R 7 is in parallel with capacitor C 3, resistance R 7 all is connected on the pressure-dividing output voltage of resistance R 2 and biasing resistor R6 with the front end of capacitor C 3, resistance R 7 be divided into two-way after capacitor C 3 is in parallel, one road is connected on the input end in the same way of operational amplifier U1, once connect after upper electric capacity C2 and resistance R 8 and be connected on operational amplifier U1 output terminal in another road, described output circuit includes capacitor C 1 and resistance R 4, output circuit one end is connected on operational amplifier U1 output terminal, the other end is connected on Current Transmit.By adopting such scheme, this product lack any one mutually in the three-phase three-wire system power supply or lack any phase in the three-phase four-wire system power supply, two-phase all can work, and all can not produce because dropping resistor burns the test function caused and lose by test button for a long time, improve the reliability of product.The design has reduced power consumption and the temperature rise of circuit simultaneously, uses low supply voltage to be more conducive to the Miniaturization Design of product.
In the utility model embodiment, between the negative pole of described operational amplifier U1 reverse input end and operational amplifier U1 output terminal, be connected with biasing resistor R1; Connect capacitor C 1 and resistance R 4 on described operational amplifier U1 output terminal, its position can exchange.
Claims (3)
1. a residual current protecting hookup, it is characterized in that: include test button S1, operational amplifier U1, Wien Bridge Circuit, output circuit summation current transformer CT, wherein test button S1 mono-end connects the access power supply, the other end is by resistance R 2 and R6 ground connection, export a signal by connecting biasing resistor R3 between resistance R 2 and R6, the R3 other end is connected to the inverting input of operational amplifier U1 input end, described Wien Bridge Circuit includes resistance R 7, resistance R 8, capacitor C 2 and capacitor C 3, wherein resistance R 7 is in parallel with capacitor C 3, resistance R 7 all is connected on the pressure-dividing output voltage of resistance R 2 and biasing resistor R6 with the front end of capacitor C 3, resistance R 7 be divided into two-way after capacitor C 3 is in parallel, one road is connected on the in-phase input end of operational amplifier U1 input end, after the upper electric capacity C2 of another road series connection and resistance R 8, be connected on operational amplifier U1 output terminal, described output circuit includes capacitor C 1 and resistance R 4, output circuit one end is connected on operational amplifier U1 output terminal, the other end is connected on Current Transmit.
2. residual current protecting hookup according to claim 1, is characterized in that: between the reverse input end of described operational amplifier U1 input end and operational amplifier U1 output terminal, be connected with biasing resistor R1.
3. residual current protecting hookup according to claim 1 and 2, is characterized in that: on described operational amplifier U1 output terminal, be in series with capacitor C 1 and resistance R 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320467288 CN203350380U (en) | 2013-08-01 | 2013-08-01 | Residual current protection test circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320467288 CN203350380U (en) | 2013-08-01 | 2013-08-01 | Residual current protection test circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203350380U true CN203350380U (en) | 2013-12-18 |
Family
ID=49750264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320467288 Withdrawn - After Issue CN203350380U (en) | 2013-08-01 | 2013-08-01 | Residual current protection test circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203350380U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103399236A (en) * | 2013-08-01 | 2013-11-20 | 德力西电气有限公司 | Residual current protection testing circuit |
| CN107332201A (en) * | 2017-08-23 | 2017-11-07 | 浙江夏兴电子科技股份有限公司 | One kind is applied to three-phase circuit simulated leakage current generating circuit |
-
2013
- 2013-08-01 CN CN 201320467288 patent/CN203350380U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103399236A (en) * | 2013-08-01 | 2013-11-20 | 德力西电气有限公司 | Residual current protection testing circuit |
| CN103399236B (en) * | 2013-08-01 | 2015-12-02 | 德力西电气有限公司 | A kind of hookup of residual current protecting |
| CN107332201A (en) * | 2017-08-23 | 2017-11-07 | 浙江夏兴电子科技股份有限公司 | One kind is applied to three-phase circuit simulated leakage current generating circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131218 Effective date of abandoning: 20151202 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |