CN204044235U - Exchange the adjustable protection warning circuit of input leakage current current value - Google Patents
Exchange the adjustable protection warning circuit of input leakage current current value Download PDFInfo
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- CN204044235U CN204044235U CN201420510919.0U CN201420510919U CN204044235U CN 204044235 U CN204044235 U CN 204044235U CN 201420510919 U CN201420510919 U CN 201420510919U CN 204044235 U CN204044235 U CN 204044235U
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Abstract
The utility model discloses a kind of interchange and input the adjustable protection warning circuit of leakage current current value, comprise ac buck part, rectifier bridge filtering circuit, mu balanced circuit, comparison control circuit, leakage current test part and indication warning circuit.Be characterized in the transformer T1 with smaller power, power to voltage stabilizing chip IC 1, IC2 after step-down rectifier filtering, powered to operational amplifier IC3 by IC1, obtained the voltage sample value of input AC leakage current by the magnet ring L1 of string between interchange constrained input, compare with the magnitude of voltage oppositely comparing end pre-set, when exchanging input leakage current and being greater than pre-set resistance, photoelectrical coupler U conducting, open the voltage of IC2, make Q1 conducting, leakage-current alarm indication end exports high level.It is few that the utility model has device, and grid adaptability is strong, the features such as reliability is high, and leakage current current value is adjustable.
Description
Technical field
The utility model relates to a kind of earth leakage protection warning circuit, specifically, relates to a kind of interchange and inputs the adjustable protection warning circuit of leakage current current value.
Background technology
At present, interchange inputs leakage current and is mostly to be realized by earth leakage protective device, and when leakage current exceedes fixing setting value, earth leakage protective device directly trips, and realizes the protection to rear pole equipment and equipment use personnel.But under certain conditions; leakage current can produce unavoidably; time smaller to equipment and people all without harm; but can damage equipment and people time larger; environment is different different with the requirement of protection to leakage current warning; so just need the thresholding controlling detection of electrical leakage and alarm and protection in the process of actual use at the scene, realize both having ensured that equipment can normally work, be unlikely to again the object of the equipment that jeopardizes and people.
Utility model content
The one that the utility model designs to solve the problems of the technologies described above just exchanges the adjustable protection warning circuit of input leakage current current value.
For solving the problem, the utility model adopts following technical scheme:
A kind of interchange inputs the adjustable protection warning circuit of leakage current current value, comprises ac buck part, rectifier bridge filtering circuit, mu balanced circuit, comparison control circuit, leakage current test part and indication warning circuit.AC220V exchanges input and becomes two-way low-voltage AC through ac buck part, and a road low-voltage AC, after rectifier bridge filtering circuit rectifying and wave-filtering, exports to three terminal regulator IC1, for comparison control circuit is powered after voltage stabilizing, and provides adjustable reference voltage; AC220V exchanges constrained input and is connected with leakage current test partial circuit, and leakage current sampling value is transformed to voltage, exports to comparison control circuit, and comparison control circuit exports and is connected with photoelectrical coupler input end U-A through resistance R6; Another road low-voltage AC, after rectifier bridge filtering circuit rectifying and wave-filtering, exports to three terminal regulator IC2, and for indication warning circuit is powered after voltage stabilizing, photoelectric coupler output end U-B is connected with indication warning circuit input control end.
The described adjustable protection warning circuit of interchange input leakage current current value, its comparison control circuit is made up of precision voltage reference conditioned circuit and operational amplifier IC3, wherein precision voltage reference conditioned circuit is by after precision resister R1 and high precision adjustable resistance R2 dividing potential drop, exports to the input negative terminal of operational amplifier IC3 through resistance R4; The output of leakage current test partial circuit is connected with the input anode of operational amplifier IC3, realize leakage current value by regulating high precision adjustable resistance R2 and export high level at the 15mA-50mA scope internal trigger operational amplifier IC3 preset, thus trigger indication warning circuit alarm.Leakage-current alarm instruction exports the high level with 1A load capacity, may meet the requirement of the various node signal of band and level indicating.
The described adjustable protection warning circuit of interchange input leakage current current value, its ac buck part adopts 10W transformer T1, is input as AC220V, exports as two-way AC16V low-voltage AC.
The described adjustable protection warning circuit of interchange input leakage current current value; its leakage current test partial circuit comprises magnet ring L1, resistance R7, diode D3, electric capacity C3 and resistance R8; the magnet ring L1 be serially connected between AC220V interchange constrained input obtains input AC leakage current; produce voltage sample value through resistance R7, diode D3, electric capacity C3 and resistance R8, then be connected with the input anode of operational amplifier IC3 by resistance R3.
The beneficial effects of the utility model are that mu balanced circuit employs the three terminal regulator the simplest, cost is minimum, relatively control section is made up of high-precision benchmark and operational amplifier, indication warning circuit is simple and reliable, leakage current current adjustment scope is large, reliability is high, warning circuit load capacity is strong, automatically by monitoring real-time for the situation exchanging input grounding resistance with reflect, very high promotional value can be had.
Accompanying drawing explanation
Fig. 1 is the utility model functional block diagram.
Fig. 2 is the utility model circuit theory diagrams.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
As illustrated in fig. 1 and 2, the utility model one exchanges the adjustable protection warning circuit of input leakage current current value, comprises ac buck part, rectifier bridge filtering circuit, mu balanced circuit, comparison control circuit, leakage current test part and indication warning circuit.AC220V exchanges input and becomes two-way low-voltage AC through ac buck part, and a road low-voltage AC, after rectifier bridge filtering circuit rectifying and wave-filtering, exports to three terminal regulator IC1, for comparison control circuit is powered after voltage stabilizing, and provides adjustable reference voltage; AC220V exchanges constrained input and is connected with leakage current test partial circuit, and leakage current sampling value is transformed to voltage, exports to comparison control circuit, and comparison control circuit exports and is connected with photoelectrical coupler input end U-A through resistance R6; Another road low-voltage AC, after rectifier bridge filtering circuit rectifying and wave-filtering, exports to three terminal regulator IC2, and for indication warning circuit is powered after voltage stabilizing, photoelectric coupler output end U-B is connected with indication warning circuit input control end.
The described adjustable protection warning circuit of interchange input leakage current current value, its comparison control circuit is made up of precision voltage reference conditioned circuit and operational amplifier IC3, wherein precision voltage reference conditioned circuit is by after precision resister R1 and high precision adjustable resistance R2 dividing potential drop, exports to the input negative terminal of operational amplifier IC3 through resistance R4; The output of leakage current test partial circuit is connected with the input anode of operational amplifier IC3, realize leakage current value by regulating high precision adjustable resistance R2 and export high level at the 15mA-50mA scope internal trigger operational amplifier IC3 preset, thus trigger indication warning circuit alarm.Leakage-current alarm instruction exports the high level with 1A load capacity, may meet the requirement of the various node signal of band and level indicating.
The described adjustable protection warning circuit of interchange input leakage current current value, its ac buck part adopts 10W transformer T1, is input as AC220V, exports as two-way AC16V low-voltage AC.
The described adjustable protection warning circuit of interchange input leakage current current value; its leakage current test partial circuit comprises magnet ring L1, resistance R7, diode D3, electric capacity C3 and resistance R8; the magnet ring L1 be serially connected between AC220V interchange constrained input obtains input AC leakage current; produce voltage sample value through resistance R7, diode D3, electric capacity C3 and resistance R8, then be connected with the input anode of operational amplifier IC3 by resistance R3.
The utility model is not limited to above-mentioned preferred forms, anyone other any or akin products identical with the utility model drawn under enlightenment of the present utility model, all drops within protection domain of the present utility model.
Claims (4)
1. exchange the adjustable protection warning circuit of input leakage current current value, comprise ac buck part, rectifier bridge filtering circuit, mu balanced circuit, comparison control circuit, leakage current test part and indication warning circuit; It is characterized in that: AC220V exchanges input and becomes two-way low-voltage AC through ac buck part, one road low-voltage AC is after rectifier bridge filtering circuit rectifying and wave-filtering, export to three terminal regulator IC1, for comparison control circuit is powered after voltage stabilizing, and provide adjustable reference voltage; AC220V exchanges constrained input and is connected with leakage current test partial circuit, and leakage current sampling value is transformed to voltage, exports to comparison control circuit, and comparison control circuit exports and is connected with photoelectrical coupler input end U-A through resistance R6; Another road low-voltage AC, after rectifier bridge filtering circuit rectifying and wave-filtering, exports to three terminal regulator IC2, and for indication warning circuit is powered after voltage stabilizing, photoelectric coupler output end U-B is connected with indication warning circuit input control end.
2. the adjustable protection warning circuit of interchange input leakage current current value according to claim 1, it is characterized in that: comparison control circuit is made up of precision voltage reference conditioned circuit and operational amplifier IC3, wherein precision voltage reference conditioned circuit is by after precision resister R1 and high precision adjustable resistance R2 dividing potential drop, exports to the input negative terminal of operational amplifier IC3 through resistance R4; The output of leakage current test partial circuit is connected with the input anode of operational amplifier IC3, realize leakage current value by regulating high precision adjustable resistance R2 and export high level at the 15mA-50mA scope internal trigger operational amplifier IC3 preset, thus trigger indication warning circuit alarm.
3. the adjustable protection warning circuit of interchange input leakage current current value according to claim 1, is characterized in that: ac buck part adopts 10W transformer T1, is input as AC220V, exports as two-way AC16V low-voltage AC.
4. the adjustable protection warning circuit of interchange input leakage current current value according to claim 1; it is characterized in that: leakage current test partial circuit comprises magnet ring L1, resistance R7, diode D3, electric capacity C3 and resistance R8; the magnet ring L1 be serially connected between AC220V interchange constrained input obtains input AC leakage current; produce voltage sample value through resistance R7, diode D3, electric capacity C3 and resistance R8, then be connected with the input anode of operational amplifier IC3 by resistance R3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420510919.0U CN204044235U (en) | 2014-09-05 | 2014-09-05 | Exchange the adjustable protection warning circuit of input leakage current current value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420510919.0U CN204044235U (en) | 2014-09-05 | 2014-09-05 | Exchange the adjustable protection warning circuit of input leakage current current value |
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| CN204044235U true CN204044235U (en) | 2014-12-24 |
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| CN201420510919.0U Active CN204044235U (en) | 2014-09-05 | 2014-09-05 | Exchange the adjustable protection warning circuit of input leakage current current value |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223519A (en) * | 2015-09-28 | 2016-01-06 | 广东易事特电源股份有限公司 | Photovoltaic inverter leakage current protection act proving installation |
| CN106058803A (en) * | 2016-07-14 | 2016-10-26 | 广东海信家电有限公司 | Live-line protection control device for electric water heater and housing of electric water heater |
| CN107995752A (en) * | 2018-01-05 | 2018-05-04 | 江苏恒鹏电气集团有限公司 | It is a kind of to detect lamp stand principal current, leakage current, the detection device of water logging at the same time |
| CN113848366A (en) * | 2021-08-10 | 2021-12-28 | 广东朝阳电子科技股份有限公司 | Shutdown leakage current detection circuit |
-
2014
- 2014-09-05 CN CN201420510919.0U patent/CN204044235U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223519A (en) * | 2015-09-28 | 2016-01-06 | 广东易事特电源股份有限公司 | Photovoltaic inverter leakage current protection act proving installation |
| CN105223519B (en) * | 2015-09-28 | 2019-04-02 | 广东易事特电源股份有限公司 | Photovoltaic inverter leakage current protection act test device |
| CN106058803A (en) * | 2016-07-14 | 2016-10-26 | 广东海信家电有限公司 | Live-line protection control device for electric water heater and housing of electric water heater |
| CN107995752A (en) * | 2018-01-05 | 2018-05-04 | 江苏恒鹏电气集团有限公司 | It is a kind of to detect lamp stand principal current, leakage current, the detection device of water logging at the same time |
| CN113848366A (en) * | 2021-08-10 | 2021-12-28 | 广东朝阳电子科技股份有限公司 | Shutdown leakage current detection circuit |
| CN113848366B (en) * | 2021-08-10 | 2023-07-18 | 广东朝阳电子科技股份有限公司 | Shutdown leakage current detection circuit |
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