CN201846058U - Over-voltage/over-current protecting circuit - Google Patents

Over-voltage/over-current protecting circuit Download PDF

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Publication number
CN201846058U
CN201846058U CN2010205547962U CN201020554796U CN201846058U CN 201846058 U CN201846058 U CN 201846058U CN 2010205547962 U CN2010205547962 U CN 2010205547962U CN 201020554796 U CN201020554796 U CN 201020554796U CN 201846058 U CN201846058 U CN 201846058U
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CN
China
Prior art keywords
resistance
current
unit
over
overvoltage
Prior art date
Application number
CN2010205547962U
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Chinese (zh)
Inventor
蔡峰毅
唐锡臣
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厦门振泰成科技有限公司
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Priority to CN2010205547962U priority Critical patent/CN201846058U/en
Application granted granted Critical
Publication of CN201846058U publication Critical patent/CN201846058U/en

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Abstract

The utility model relates to the field of electronic circuits, in particular to an over-voltage/over-current protecting circuit which is driven by alternating-current mains supply. The over-voltage/over-current protecting circuit monitors and protects the current and voltage of the alternating current respectively through an over-current protecting circuit and an over-voltage protecting circuit, wherein the over-current protecting circuit comprises an over-current transformer, a rectifier bridge unit, a resistance voltage dividing unit, an operational amplifier comparison circuit and a silicon controlled thyristor; and the over-voltage protecting circuit comprises a rectifier bridge unit, a resistance voltage dividing unit, an operational amplifier comparison unit and a silicon controlled thyristor. When the load access end is over-current or over-voltage, the coil of a tripping device controls the tripping device to disconnect the input channel of the alternating current, so that electrical potential hazard is avoided and the personal and property safety is guaranteed.

Description

A kind of overvoltage, current foldback circuit

Technical field

The utility model relates to electronic circuit field, relates in particular to overvoltage, the current foldback circuit of the load of electric main driving.

Background technology

Various electric appliance loads (as refrigerator, television set, air conditioner, computer, hair dryer or the like) by electric main driving work are to be inseparable with people's life.But at the electric appliance load incoming end, only provide access interface, and lack necessary electic protection, have potential safety hazard for electric appliance load as switch on wall, power supply adaptor or socket etc.If when running into short circuit, electric leakage, overvoltage, overcurrent, ground wire electrification or ground wire and disconnecting, damage load easily and the user caused personal injury, also cause electrical fire easily, cause any property loss.

The utility model content

Therefore,, the utility model proposes a kind of rational and effective overvoltage, current foldback circuit at the problems referred to above, be arranged at the load incoming end before, be used to protect load, prevent that overvoltage, over-current phenomenon avoidance from taking place, and can avoid electric hidden danger.

The utility model adopts following technical scheme:

A kind of overvoltage; current foldback circuit; specifically: the live wire of alternating current connects one and crosses current transformer; this crosses behind rectification unit that current transformer output connects and the delay unit first input end to first comparator; the rectifying bridge type unit that the live wire of alternating current and zero line insert a release and be made up of 4 diodes; the partial pressure unit that the output of this rectifying bridge type unit and rectification ground termination are gone into a controllable silicon and be made up of the resistance of series connection; the intermediate ends of the resistance of series connection is connected to second input of first comparator; the intermediate ends of the resistance of series connection connects the rectification ground end of a voltage stabilizing didoe to the rectifying bridge type unit; the output of described first comparator resistance of connecting; one voltage stabilizing didoe; behind the one polarity diode to the silicon controlled control utmost point; the output of described rectifying bridge type unit and rectification ground end also insert the partial pressure unit of being made up of the resistance of series connection; the intermediate ends of the resistance of series connection is connected to the first input end of second comparator; second input of this second comparator is connected in the negative pole end of above-mentioned voltage stabilizing didoe, the output of this second comparator resistance of connecting; silicon controlled extremely above-mentioned behind the one polarity diode is controlled the utmost point.

Further, the first input end of described second comparator connects the rectification ground end of a filter capacitor to the rectifying bridge type unit.

Further, the intermediate ends of described series resistance and polarity diode is connected the rectification ground end of a filter capacitor to the rectifying bridge type unit.

Further, the intermediate ends of the resistance of a described series connection voltage stabilizing didoe in parallel and filter capacitor are to the rectification ground end of rectifying bridge type unit.

Further, described rectification unit is the diode rectifier circuit unit.

Further, described delay unit is the RC time delay circuit unit.

Further, also connect a piezo-resistance between described live wire and the zero line.

Further, also connect a power supply indicating member of forming by diode in series, current-limiting resistance, light-emitting diode between described live wire and the zero line.

The utility model adopts as above technical scheme; by crossing the current foldback circuit that current transformer, rectifying bridge type unit, electric resistance partial pressure unit, amplifier comparison circuit and controllable silicon constitute; overvoltage crowbar by rectifying bridge type unit, electric resistance partial pressure unit, amplifier comparison circuit and controllable silicon formation; electric current and voltage to alternating current carries out monitoring and protection respectively; when overcurrent, overvoltage phenomenon appear in the load incoming end; disconnect the alternating current input channel by trip coil control release; avoid electric hidden danger, ensured the person and property safety.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model.

Embodiment

Now with embodiment the utility model is further specified in conjunction with the accompanying drawings.

Consult shown in Figure 1; the overvoltage of present embodiment; current foldback circuit; specifically: the live wire L of alternating current connects one and crosses current transformer ZCT1; this crosses behind rectification unit that current transformer ZCT1 output connects and the delay unit first input end to the first comparator IC1; the rectifying bridge type cells D B1 that the live wire L of alternating current and zero line N insert a release TK1 and be made up of 4 diodes; the output of this rectifying bridge type cells D B1 and rectification ground termination is gone into a controllable silicon SCR 1 and by the resistance R 2 of series connection; R6; R8; the partial pressure unit that R9 forms; the resistance R 8 of series connection; the intermediate ends of R9 is connected to second input of the first comparator I C1; the resistance R 6 of series connection; the intermediate ends of R8 connects the rectification ground end of a voltage stabilizing didoe D10 to rectifying bridge type cells D B1; the output of the described first comparator IC1 resistance R 12 of connecting; one voltage stabilizing didoe D11; behind the one polarity diode D12 to the control utmost point of controllable silicon SCR 1; the output of described rectifying bridge type cells D B1 and rectification ground end also insert the resistance R 7 by series connection; R10; the partial pressure unit that R11 forms; the resistance R 7 of series connection; the intermediate ends of R10 is connected to the first input end of the second comparator IC2; second input of this second comparator IC2 is connected in the negative pole end of above-mentioned voltage stabilizing didoe D10, the output of this second comparator IC2 resistance R 13 of connecting; the control utmost point of extremely above-mentioned controllable silicon SCR 1 behind the one polarity diode D13.

Preferably, the first input end of the described second comparator IC2 connects the rectification ground end of a filter capacitor C4 to rectifying bridge type cells D B1, can be used for the noise jamming composition of filtering overvoltage signal.The intermediate ends of described series resistance R13 and polarity diode D13 is connected the rectification ground end of a filter capacitor C6 to rectifying bridge type cells D B1.The resistance R 2 of described series connection, the intermediate ends of a R6 voltage stabilizing didoe D7 in parallel and filter capacitor C5 are to the rectification ground end of rectifying bridge type cells D B1.

Preferably, described rectification unit is the diode rectifier circuit unit.Can filtering cross the clutter composition of current transformer ZCT1 output by this rectification unit, prevent to disturb, obtains more reliable and more stable overcurrent relatively terminal voltage import.

Preferably, described delay unit is the RC time delay circuit unit.Can regulate the overcurrent delay time by the RC span, time-delay is the inverse time lag, prevents at the moment of translator startup, release false tripping.

Preferably, also connect a piezo-resistance MOV1 between described live wire L and the zero line N, be used to avoid the surge voltage of live wire L and zero line N, avoid damaging load because of thunderbolt.

Preferably, also connect a power supply indicating member of forming by diode in series D1, current-limiting resistance R1, light-emitting diode D2 between described live wire L and the zero line N, be used to indicate load to insert the power supply operate as normal and use.

Overvoltage of the present utility model, current foldback circuit are normal at the protected circuit working of load, and overvoltage, current foldback circuit normal power supply take place in the absence of overvoltage, overcurrent.When load generation overcurrent; cross high voltage signal of current transformer ZCT1 output; by comparing with the reference voltage of the first comparator IC1, second input behind rectification rectification unit and the delay unit; if generation over-current phenomenon avoidance; then the first comparator IC1 triggers controllable silicon SCR 1 conducting by relatively back output one voltage signal; make the coil that is connected on the release between live wire L and the controllable silicon SCR 1 have big electric current to flow through; iron core pulling dropout plate in the coil of release TK1; make pull bar break away from the dropout plate; moving contact leaves fixed contact; this control release TK1 is cut off the electricity supply, avoided casualties, reach the purpose of overcurrent protection.Same, when load generation overvoltage, voltage behind the rectifying bridge type cells D B1 raises, thereby make resistance R 7, the dividing potential drop of R10 end raises, compare with the reference voltage of the second comparator IC2, second input, if the overvoltage phenomenon takes place, then the second comparator IC2 triggers controllable silicon SCR 1 conducting by relatively back output one voltage signal, also make the coil that is connected on the release between live wire L and the controllable silicon SCR 1 have big electric current to flow through, iron core pulling dropout plate in the coil of release TK1, make pull bar break away from the dropout plate, moving contact leaves fixed contact, and this control release TK1 is cut off the electricity supply.Therefore, when no matter overvoltage or over-current phenomenon avoidance took place, the utility model all can carry out electic protection to load.

Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present utility model that do not break away from appended claims and limited; can make various variations to the utility model in the form and details, be protection range of the present utility model.

Claims (8)

1. overvoltage; current foldback circuit; it is characterized in that: the live wire of alternating current (L) connects one and crosses current transformer (ZCT1); this crosses behind rectification unit that current transformer (ZCT1) output connects and the delay unit first input end to first comparator (IC1); the rectifying bridge type unit (DB1) that live wire of alternating current (L) and zero line (N) insert a release (TK1) and be made up of 4 diodes; the output of this rectifying bridge type unit (DB1) and rectification ground termination is gone into a controllable silicon (SCR1) and by the resistance (R2 of series connection; R6; R8; R9) partial pressure unit of Zu Chenging; resistance (the R8 of series connection; R9) intermediate ends is connected to second input of first comparator (IC1); resistance (the R6 of series connection; R8) intermediate ends connects the rectification ground end of a voltage stabilizing didoe (D10) to rectifying bridge type unit (DB1); the output of described first comparator (IC1) resistance (R12) of connecting; one voltage stabilizing didoe (D11); one polarity diode (D12) back is to the control utmost point of controllable silicon (SCR1); the output of described rectifying bridge type unit (DB1) and rectification ground end also insert the resistance (R7 by series connection; R10; R11) partial pressure unit of Zu Chenging; resistance (the R7 of series connection; R10) intermediate ends is connected to the first input end of second comparator (IC2); second input of this second comparator (IC2) is connected in the negative pole end of above-mentioned voltage stabilizing didoe (D10), the output of this second comparator (IC2) resistance (R13) of connecting; one polarity diode (D13) back is to the control utmost point of above-mentioned controllable silicon (SCR1).
2. overvoltage according to claim 1, current foldback circuit is characterized in that: the first input end of described second comparator (IC2) connects the rectification ground end of a filter capacitor (C4) to rectifying bridge type unit (DB1).
3. overvoltage according to claim 1, current foldback circuit is characterized in that: the intermediate ends of described series resistance (R13) and polarity diode (D13) is connected the rectification ground end of a filter capacitor (C6) to rectifying bridge type unit (DB1).
4. overvoltage according to claim 1, current foldback circuit is characterized in that: the intermediate ends of the resistance of described series connection (R2, a R6) voltage stabilizing didoe (D7) in parallel and filter capacitor (C5) are to the rectification ground end of rectifying bridge type unit (DB1).
5. overvoltage according to claim 1, current foldback circuit is characterized in that: described rectification unit is the diode rectifier circuit unit.
6. overvoltage according to claim 1, current foldback circuit is characterized in that: described delay unit is the RC time delay circuit unit.
7. overvoltage according to claim 1, current foldback circuit is characterized in that: also connect a piezo-resistance (MOV1) between described live wire (L) and the zero line (N).
8. overvoltage according to claim 1, current foldback circuit is characterized in that: also connect a power supply indicating member of being made up of diode in series (D1), current-limiting resistance (R1), light-emitting diode (D2) between described live wire (L) and the zero line (N).
CN2010205547962U 2010-09-29 2010-09-29 Over-voltage/over-current protecting circuit CN201846058U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010205547962U CN201846058U (en) 2010-09-29 2010-09-29 Over-voltage/over-current protecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010205547962U CN201846058U (en) 2010-09-29 2010-09-29 Over-voltage/over-current protecting circuit

Publications (1)

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CN201846058U true CN201846058U (en) 2011-05-25

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CN2010205547962U CN201846058U (en) 2010-09-29 2010-09-29 Over-voltage/over-current protecting circuit

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102354943A (en) * 2011-09-20 2012-02-15 广东天富电气集团有限公司 Work method of electronic release
CN103138232A (en) * 2011-12-02 2013-06-05 周霆 Ultrasonic nebulizer water shortage protection circuit
CN103166176A (en) * 2011-12-16 2013-06-19 上海精翊电器有限公司 Under-voltage protection tripper for low-voltage circuit breaker
CN103515922A (en) * 2012-06-25 2014-01-15 中国人民解放军理工大学 Self-recovery and overcurrent protection circuit for power amplifier integrated circuit
CN104901270A (en) * 2015-04-30 2015-09-09 武汉爱德威科技有限责任公司 Self-recovery high side overvoltage protection circuit for electronic control unit of nitrogen oxygen sensor
CN105098721A (en) * 2014-04-16 2015-11-25 南京南瑞继保电气有限公司 Overvoltage protection circuit and overvoltage protection method for converter sub-module
CN105406292A (en) * 2015-01-28 2016-03-16 余姚市嘉荣电子电器有限公司 Protection plug with power-off tripping function
CN107947110A (en) * 2017-11-27 2018-04-20 安徽文尧智能光电科技有限公司 A kind of overvoltage crowbar of frozen food color selector

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102354943A (en) * 2011-09-20 2012-02-15 广东天富电气集团有限公司 Work method of electronic release
CN102354943B (en) * 2011-09-20 2016-12-28 广东天富电气股份有限公司 A kind of method of work of electronic trip unit
CN103138232A (en) * 2011-12-02 2013-06-05 周霆 Ultrasonic nebulizer water shortage protection circuit
CN103166176A (en) * 2011-12-16 2013-06-19 上海精翊电器有限公司 Under-voltage protection tripper for low-voltage circuit breaker
CN103166176B (en) * 2011-12-16 2015-05-20 上海精翊电器有限公司 Under-voltage protection tripper for low-voltage circuit breaker
CN103515922A (en) * 2012-06-25 2014-01-15 中国人民解放军理工大学 Self-recovery and overcurrent protection circuit for power amplifier integrated circuit
CN105098721B (en) * 2014-04-16 2018-08-17 南京南瑞继保电气有限公司 A kind of overvoltage crowbar and method of transverter submodule
CN105098721A (en) * 2014-04-16 2015-11-25 南京南瑞继保电气有限公司 Overvoltage protection circuit and overvoltage protection method for converter sub-module
CN105490101A (en) * 2015-01-28 2016-04-13 余姚市嘉荣电子电器有限公司 Protection plug with power-off tripping and overvoltage tripping functions
CN105406292A (en) * 2015-01-28 2016-03-16 余姚市嘉荣电子电器有限公司 Protection plug with power-off tripping function
CN106299908A (en) * 2015-01-28 2017-01-04 余姚市嘉荣电子电器有限公司 Possesses the protection plug of power-off tripping operation and superpressure trip avoidance function
CN105490101B (en) * 2015-01-28 2018-07-10 余姚市嘉荣电子电器有限公司 Has the protection plug of power-off tripping and superpressure trip avoidance function
CN105406292B (en) * 2015-01-28 2018-07-10 余姚市嘉荣电子电器有限公司 Has the protection plug of power-off tripping
CN106299908B (en) * 2015-01-28 2019-07-12 余姚市嘉荣电子电器有限公司 The protection plug for having power-off tripping and superpressure trip avoidance function
CN104901270A (en) * 2015-04-30 2015-09-09 武汉爱德威科技有限责任公司 Self-recovery high side overvoltage protection circuit for electronic control unit of nitrogen oxygen sensor
CN107947110A (en) * 2017-11-27 2018-04-20 安徽文尧智能光电科技有限公司 A kind of overvoltage crowbar of frozen food color selector

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Granted publication date: 20110525

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