CN201032683Y - Overcurrent protection circuit - Google Patents
Overcurrent protection circuit Download PDFInfo
- Publication number
- CN201032683Y CN201032683Y CNU2007200173773U CN200720017377U CN201032683Y CN 201032683 Y CN201032683 Y CN 201032683Y CN U2007200173773 U CNU2007200173773 U CN U2007200173773U CN 200720017377 U CN200720017377 U CN 200720017377U CN 201032683 Y CN201032683 Y CN 201032683Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- relay
- diode
- model
- utility
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to an over-current protection circuit which belongs to the electrical safety field. The technical proposal of the utility model is that a power circuit consists of electric capacities C1, C2 and C3, resistances R1 and R2, a diode D1 and a zener diode DW1. A current detecting circuit consists of a current transformer B, a diode D2, an electric capacity C4 and a potentiometer W. A circuit cut-off executive circuit consists of a zener diode DW2, a resistance R3, a triode T and a relay J. Two ends of the relay J and a diode D3 are in parallel connection. A normally closed contact J-1 of the relay J is connected in series in the power supply circuit. A normally open contact J-2 is connected in parallel on the collecting electrode and the emitting electrode of the triode T. The power circuit is connected in series with a restore button AN. The utility model has the advantages of simple structure and easy operation. The utility model has the effect of overload protection through being arranged at the front end of the supply power. The utility model has the function of press key restoring and the operating efficiency is enhanced.
Description
Technical field
The utility model relates to a kind of current overload protection circuit in safety utilization of electric power field.
Background technology
The most of fuse that adopts of the low pressure electricity consumption of present family, factories and miness is realized overcurrent protection, when the fusing of customary risks silk is changed, needs the staff to look for the fuse etc. of instrument, same model, inefficiency; And need repeatedly change fuse for searching the fault point sometimes, bother very much and lose time.
Summary of the invention
The purpose of this utility model is exactly the defective that exists at prior art, provide a kind of when power supply transship the overload protecting circuit of energy automatic disconnection power supply circuit.
Its technical scheme is: form power circuit by capacitor C 1, C2, C3, resistance R 1, R2, diode D1, voltage stabilizing didoe DW1; Form current detection circuit by current transformer B, diode D2, capacitor C 4, potentiometer W; Cut off executive circuit by voltage stabilizing didoe DW2, resistance R 3, triode T, relay J built-up circuit.The two ends parallel diode D3 of relay J, the normally-closed contact J-1 of relay J is connected in the current supply circuit, and the normally opened contact J-2 of relay J is connected in parallel on the collector and emitter of triode T.The power circuit series connection recovers knob AN.
The utlity model has simple in structurely, easy to use, be installed in the front end of power supply, can play overload protection, and have the button restore funcitons, increase work efficiency.
Description of drawings
Embodiment
In conjunction with the accompanying drawings, this circuit is formed power circuit by capacitor C 1, C2, C3, resistance R 1, R2, diode D1, voltage stabilizing didoe DW1; Form current detection circuit by current transformer B, diode D2, capacitor C 4, potentiometer W; Cut off executive circuit by voltage stabilizing didoe DW2, resistance R 3, triode T, relay J built-up circuit.The two ends parallel diode D3 of relay J, the normally-closed contact J-1 of relay J is connected in the current supply circuit, and the normally opened contact J-2 of relay J is connected in parallel on the collector and emitter of triode T.The power circuit series connection recovers knob AN.
Its operation principle: when normal electricity consumption, this circuit is not worked, and the normally-closed contact J-1 of relay J keeps, and power supply is normal.When load surpasses the setting electric current, the secondary induced voltage of current transformer B raises and puncture voltage stabilizing didoe DW2 through is made of current detection circuit current transformer B, diode D2, capacitor C 4, potentiometer W after, triode T conducting, the relay J adhesive, normally-closed contact J-1 disconnects and cuts off power supply.The normally opened contact J-2 closure of relay J keeps relay J simultaneously.After fault is got rid of, lose sustaining voltage and recover power supply continuation power supply as long as press knob AN relay J.Need the size of current of control to regulate by potentiometer W.
Claims (2)
1. current overload protection circuit, it is characterized in that: comprise that power circuit, current detection circuit, circuitry cuts executive circuit connect to form, power circuit wherein is made up of electric capacity (C1, C2, C3), resistance (R1, R2), diode (D1), voltage stabilizing didoe (DW1); Current detection circuit is made up of current transformer (B), diode (D2), electric capacity (C4), potentiometer (W); The circuitry cuts executive circuit is made up of voltage stabilizing didoe (DW2), resistance (R3), triode (T), relay (J); The normally-closed contact (J-1) of relay (J) is connected in the current supply circuit, and the normally opened contact (J-2) of relay (J) is connected in parallel on the collector and emitter of triode (T).
2. current overload protection circuit according to claim 1 is characterized in that: recover knob (AN) in the power circuit series connection, and at the two ends parallel diode (D3) of relay (J),
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200173773U CN201032683Y (en) | 2007-01-09 | 2007-01-09 | Overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200173773U CN201032683Y (en) | 2007-01-09 | 2007-01-09 | Overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201032683Y true CN201032683Y (en) | 2008-03-05 |
Family
ID=39164570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200173773U Expired - Fee Related CN201032683Y (en) | 2007-01-09 | 2007-01-09 | Overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201032683Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103077850A (en) * | 2011-10-25 | 2013-05-01 | 上海船厂船舶有限公司 | Adjustment device and adjustment method of current relay |
| CN104362581A (en) * | 2014-12-05 | 2015-02-18 | 成都安思科技有限公司 | Self-resetting electronic safety circuit |
| CN106159900A (en) * | 2016-08-20 | 2016-11-23 | 成都云士达科技有限公司 | A kind of protection circuit for carrying out current transformer function and protecting |
| CN109687389A (en) * | 2018-12-26 | 2019-04-26 | 深圳市证通电子股份有限公司 | Circuit protection method and device |
-
2007
- 2007-01-09 CN CNU2007200173773U patent/CN201032683Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103077850A (en) * | 2011-10-25 | 2013-05-01 | 上海船厂船舶有限公司 | Adjustment device and adjustment method of current relay |
| CN104362581A (en) * | 2014-12-05 | 2015-02-18 | 成都安思科技有限公司 | Self-resetting electronic safety circuit |
| CN106159900A (en) * | 2016-08-20 | 2016-11-23 | 成都云士达科技有限公司 | A kind of protection circuit for carrying out current transformer function and protecting |
| CN109687389A (en) * | 2018-12-26 | 2019-04-26 | 深圳市证通电子股份有限公司 | Circuit protection method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101378187B (en) | Power supply protection circuit | |
| CN103872658B (en) | Multifunction self-resetting formula is crossed, under-voltage protector | |
| CN201032683Y (en) | Overcurrent protection circuit | |
| CN204882821U (en) | Killer switch state detection circuitry | |
| CN202424257U (en) | Battery charging circuit | |
| CN203278206U (en) | Battery pack discharging protection circuit and device | |
| CN103364688A (en) | Three-jack socket electric leakage detection circuit | |
| CN104953537A (en) | Overload protection switching device | |
| CN202616871U (en) | Zero second switching protection device of storage battery | |
| CN205911947U (en) | Power supply ware starts constant current circuit | |
| CN205945006U (en) | Over -current protective control circuit | |
| CN201854178U (en) | Practical overcurrent protecting circuit | |
| CN201004548Y (en) | Current leakage protector with zero line breaking protection | |
| CN204407861U (en) | A kind of Low-Voltage Leakage Protection | |
| CN200976481Y (en) | Single-phase overvoltage and overcurrent protective switch | |
| CN204741261U (en) | Feeder protection equipment with power down protection box arc extinction function | |
| CN202424113U (en) | Over-voltage leakage protection device | |
| CN204376376U (en) | Based on the time lagged type residual current action breaker of Quick-type electric leakage integrated package | |
| CN202679332U (en) | Digital air switch | |
| CN203850824U (en) | Multifunctional self-recovery over-voltage and under-voltage protector | |
| CN201766341U (en) | Overvoltage protection air switch | |
| CN101330201B (en) | Apparatus for protecting power supply | |
| CN201774219U (en) | Protective circuit of single-phase energy meter | |
| CN203553886U (en) | Short-circuit-resistant self-resetting circuit breaker | |
| CN202309014U (en) | Short circuit and overload protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080305 |