CN105529680A - Electric leakage and pulse current detection circuit - Google Patents
Electric leakage and pulse current detection circuit Download PDFInfo
- Publication number
- CN105529680A CN105529680A CN201510939403.7A CN201510939403A CN105529680A CN 105529680 A CN105529680 A CN 105529680A CN 201510939403 A CN201510939403 A CN 201510939403A CN 105529680 A CN105529680 A CN 105529680A
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- China
- Prior art keywords
- pulse current
- resistance
- electric leakage
- detection circuit
- circuit
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
Abstract
The invention relates to an electric leakage and pulse current detection circuit. The electric leakage and pulse detection circuit comprises a current detection circuit and an electric leakage and pulse current protection circuit, wherein the electric leakage and pulse current protection circuit further comprises an electric leakage current judgment protection circuit, a pulse current judgment protection circuit and an electric leakage current/pulse current protection selection circuit, and the current detection circuit comprises a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and an operational amplifier U1B. By the adoption of the operational amplifier with a working temperature ranging from (-40) DEG C to 125 DEG C, electrical leakage and pulse current protection is achieved; the whole circuit is simple in design and high in reliability, and the electromagnetic compatibility resistance performance is also high; and meanwhile, the electric leakage and pulse current detection circuit is low in cost and is very suitable for mass production of resettable electric leakage protectors.
Description
Technical field
The present invention relates to a kind of current detection circuit, more particularly, relate to a kind of electric leakage and pulse current detection circuit.
Background technology
In existing leakage protection circuit, generally adopt electric leakage special chip M54123 or M54133 to realize earth leakage protective, its shortcoming is detection and the protection that cannot realize pulse current, causes False Leakage Protector Operation and brings unnecessary trouble to user; The limit normal operating temperature range of M54123 or M54133 is at-20 DEG C ~ 85 DEG C simultaneously, but the temperature of some occasion of actual working environment temperature of earth leakage protective device is all more than 100 DEG C, will there is the risk of earth leakage protective device disabler.For the method conventional at present that solves the problem adopts the design platform of microcontroller to realize, its shortcoming is complex circuit designs, and also not having pulse current calculating method very reliably to cause product reliability poor at present, production cost is high simultaneously, is unfavorable for batch production.
Therefore, prior art urgently has greatly improved.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defect of prior art, provides a kind of electric leakage and pulse current detection circuit, comprising: current detection circuit and electric leakage and pulse current protective circuit; Wherein said electric leakage and pulse current protective circuit comprise leakage current further and judge protective circuit, and pulse current judges protective circuit, leakage current or pulse current protective seletion circuit;
Wherein said current detection circuit comprises diode D1, diode D2, diode D3, diode D4, electric capacity C1, electric capacity C2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8 and operational amplifier U1B;
Described leakage current judges that protective circuit comprises resistance R12, resistance R13, resistance R14, operational amplifier U1C;
Described pulse current judges that protective circuit comprises resistance R9, resistance R10, resistance R11, operational amplifier U1A and electric capacity C8;
Described leakage current or pulse current protective seletion circuit comprise diode D5, D6.
Implement electric leakage of the present invention and pulse current detection circuit; there is following beneficial effect: adopt the operational amplifier realization electric leakage of operating temperature range at-40 DEG C ~ 125 DEG C and the protection of pulse current; not only whole circuit design is simple; reliability is high; and anti-electromagnetic compatibility characteristic is high, be applicable to very much self-healing earth leakage protector batch production at the bottom of cost simultaneously.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the current detection circuit schematic diagram of the first embodiment of electric leakage of the present invention and pulse current detection circuit;
Fig. 2 is electric leakage and the pulse current protective circuit schematic diagram of the first embodiment of electric leakage of the present invention and pulse current detection circuit.
Embodiment
Referring to Fig. 1, is the current detection circuit schematic diagram of the first embodiment of electric leakage of the present invention and pulse current detection circuit.As shown in Figure 1, in the electric leakage provided in first embodiment of the invention and pulse current detection circuit, described current detection circuit comprises diode D1, diode D2, diode D3, diode D4, electric capacity C1, electric capacity C2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8 and operational amplifier U1B.
Incorporated by reference to consulting Fig. 2, be electric leakage and the pulse current protective circuit schematic diagram of the first embodiment of electric leakage of the present invention and pulse current detection circuit.As shown in Figure 2, in the first embodiment provided by the invention, described leakage current judges that protective circuit comprises resistance R12, resistance R13, resistance R14, operational amplifier U1C;
Described pulse current judges that protective circuit comprises resistance R9, resistance R10, resistance R11, operational amplifier U1A and electric capacity C8;
Described leakage current or pulse current protective seletion circuit comprise diode D5, D6.
Current detection circuit and electric leakage and pulse current protective circuit; Wherein said electric leakage and pulse current protective circuit comprise leakage current further and judge protective circuit, and pulse current judges protective circuit, leakage current or pulse current protective seletion circuit.
The present invention is by the design of above first embodiment; adopt the operational amplifier realization electric leakage of operating temperature range at-40 DEG C ~ 125 DEG C and the protection of pulse current; not only whole circuit design is simple; reliability is high; and anti-electromagnetic compatibility characteristic is high, be applicable to very much self-healing earth leakage protector batch production at the bottom of cost simultaneously.
The present invention is described according to specific embodiment, but it will be understood by those skilled in the art that when not departing from the scope of the invention, can carry out various change and equivalent replacement.In addition, for adapting to the specific occasion of the technology of the present invention, can many amendments be carried out to the present invention and not depart from its protection range.Therefore, the present invention is not limited to specific embodiment disclosed herein, and comprises all embodiments dropping into claims.
Claims (1)
1. electric leakage and a pulse current detection circuit, is characterized in that, comprising: current detection circuit and electric leakage and pulse current protective circuit; Wherein said electric leakage and pulse current protective circuit comprise leakage current further and judge protective circuit, and pulse current judges protective circuit, leakage current or pulse current protective seletion circuit;
Wherein said current detection circuit comprises diode D1, diode D2, diode D3, diode D4, electric capacity C1, electric capacity C2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8 and operational amplifier U1B;
Described leakage current judges that protective circuit comprises resistance R12, resistance R13, resistance R14, operational amplifier U1C;
Described pulse current judges that protective circuit comprises resistance R9, resistance R10, resistance R11, operational amplifier U1A and electric capacity C8;
Described leakage current or pulse current protective seletion circuit comprise diode D5, D6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510939403.7A CN105529680A (en) | 2015-08-20 | 2015-12-15 | Electric leakage and pulse current detection circuit |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510513992.2A CN105044438A (en) | 2015-08-20 | 2015-08-20 | Electric leakage and pulse current detection circuit |
| CN2015105139922 | 2015-08-20 | ||
| CN201510939403.7A CN105529680A (en) | 2015-08-20 | 2015-12-15 | Electric leakage and pulse current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105529680A true CN105529680A (en) | 2016-04-27 |
Family
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510513992.2A Pending CN105044438A (en) | 2015-08-20 | 2015-08-20 | Electric leakage and pulse current detection circuit |
| CN201510939403.7A Pending CN105529680A (en) | 2015-08-20 | 2015-12-15 | Electric leakage and pulse current detection circuit |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510513992.2A Pending CN105044438A (en) | 2015-08-20 | 2015-08-20 | Electric leakage and pulse current detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN105044438A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07312164A (en) * | 1994-05-17 | 1995-11-28 | Kawamura Denki Sangyo Kk | Earth leakage breaker |
| CN2311092Y (en) * | 1997-06-27 | 1999-03-17 | 王黎明 | Pulse earth leakage protector |
| CN2420559Y (en) * | 2000-03-23 | 2001-02-21 | 广东美的集团股份有限公司 | Four-way outlet indoor machine evaporator |
| CN204167871U (en) * | 2014-10-28 | 2015-02-18 | 淄博上力电气有限公司 | A kind of Aftercurrent protection circuit breaker |
| CN205212411U (en) * | 2015-08-20 | 2016-05-04 | 浙江凯发电气股份有限公司 | Electric leakage and pulse current detection circuitry |
-
2015
- 2015-08-20 CN CN201510513992.2A patent/CN105044438A/en active Pending
- 2015-12-15 CN CN201510939403.7A patent/CN105529680A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07312164A (en) * | 1994-05-17 | 1995-11-28 | Kawamura Denki Sangyo Kk | Earth leakage breaker |
| CN2311092Y (en) * | 1997-06-27 | 1999-03-17 | 王黎明 | Pulse earth leakage protector |
| CN2420559Y (en) * | 2000-03-23 | 2001-02-21 | 广东美的集团股份有限公司 | Four-way outlet indoor machine evaporator |
| CN204167871U (en) * | 2014-10-28 | 2015-02-18 | 淄博上力电气有限公司 | A kind of Aftercurrent protection circuit breaker |
| CN205212411U (en) * | 2015-08-20 | 2016-05-04 | 浙江凯发电气股份有限公司 | Electric leakage and pulse current detection circuitry |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105044438A (en) | 2015-11-11 |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 2-1 No. 325000 Zhejiang city of Wenzhou province Yueqing North white elephant white town road (South) Applicant after: Zhejiang Kai FA Electric Co., Ltd. Address before: 2-1 No. 325000 Zhejiang city of Wenzhou province Yueqing North white elephant white town road (South) Applicant before: ZHEJIANG KAIFA ELECTRICAL CO., LTD. |
|
| CB03 | Change of inventor or designer information |
Inventor after: Yu Cuntai Inventor after: Li Qili Inventor after: Zhang Huoming Inventor after: Yang Xiaoteng Inventor after: Fang Xiaodong Inventor before: Yu Cuntai Inventor before: Fang Xiaodong Inventor before: Zhang Huoming Inventor before: Xiao Yifeng Inventor before: Peng Kunming |
|
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160427 |
|
| RJ01 | Rejection of invention patent application after publication |