CN104795790A - Leakage protector device capable of automatically identifying and switching voltage and current - Google Patents
Leakage protector device capable of automatically identifying and switching voltage and current Download PDFInfo
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- CN104795790A CN104795790A CN201510239428.6A CN201510239428A CN104795790A CN 104795790 A CN104795790 A CN 104795790A CN 201510239428 A CN201510239428 A CN 201510239428A CN 104795790 A CN104795790 A CN 104795790A
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Abstract
The invention discloses a leakage protector device capable of automatically identifying and switching voltage and current. The leakage protector device comprises a releaser, an indicator light circuit, an amplifying circuit, a silicon controlled rectifier, an optocoupler detection circuit, a voltage detection circuit and a current detection circuit, wherein the optocoupler detection circuit is used for driving the voltage detection circuit; and the voltage detection circuit and the current detection circuit are switched with each other. A mechanical change-over switch is replaced by an electronic interlock switch; two-way interlocking and unlocking are realized by E-N terminal voltage detection and current detection; protection is started only when the conditions that E-N terminal voltage is greater than preset voltage, and current is greater than preset current; and or else, the leakage protector device is in a monitoring standby state constantly, so that self-adaptive switching between a voltage mode and a current mode in different environments is realized.
Description
Technical field
The present invention relates to Electrical Safety resist technology field, especially relate to and automatically can identify switched voltage current mode leakage protector device.
Background technology
Existing changeable earth leakage protective device utilizes change over switch artificially to select " voltage-type " or " current mode " to be suitable for different power utilization environments; because power utilization environment exists changeable factor; causing former using forestland again not adapt to cause False Leakage Protector Operation, needing to design new circuit for electric leakage protector for solving electricity consumption changeable environment.
Summary of the invention
(1) technical problem that will solve
Object of the present invention will overcome above-mentioned shortcoming exactly, aims to provide one and automatically can identify switched voltage current mode leakage protector device.
(2) technical scheme
For solving the problem, the present invention proposes one can identify switched voltage current mode leakage protector device automatically, comprises release, indicator light circuit, amplifying circuit and controllable silicon, also comprises optocoupler testing circuit, voltage detecting circuit and current detection circuit; Described optocoupler testing circuit is used for driving voltage testing circuit, and described voltage detecting circuit and current detection circuit switch mutually.
Further, described voltage detecting circuit comprises triode Q2, triode Q3, triode Q6, triode Q7 and triode Q11, described triode Q2 base stage connecting triode Q7 emitter, described triode Q3 base stage is controlled by photoelectric coupled circuit, the base stage of described triode Q3 collector electrode connecting triode Q7, is provided with resistance R4 between described triode Q6 and triode Q7; The base stage of described triode Q11 collector electrode connecting triode Q6, is provided with resistance R2 between the collector electrode of described triode Q11 and triode Q2 collector electrode; The base stage of described triode Q11 is controlled by current detection circuit.
Further, described current detection circuit comprises triode Q4, triode Q5, triode Q8, triode Q9, triode Q10, triode Q12 and ground wire instrument transformer; Described ground wire instrument transformer is for responding to ground wire electrical leakage voltage, described triode Q8 base stage is controlled by ground wire instrument transformer, the base stage of described triode Q4 is controlled by triode Q8, the collector electrode connecting triode Q9 base stage of triode Q4, the collector electrode of described triode Q5 base stage connecting triode Q9; The collector electrode of described triode Q10 base stage connecting triode Q12, the base stage of described triode Q12 is controlled by the collector electrode of triode Q2, and described triode Q11 base stage is controlled by triode Q5; Described triode Q10 base stage is controlled by triode Q5.
Further, described photoelectric coupled circuit comprises optocoupler U1, LED 1, electric capacity C2, resistance R10 and diode D1, wherein LED 1 is arranged between optocoupler U1 first input end and zero line, and described electric capacity C2 and resistance R10 is arranged between ground wire and second input of optocoupler U1 after connecting; Described diode D1 positive pole connecting to neutral line, negative pole connecting resistance R10.
Further, this circuit is also provided with charging capacitor C13 and voltage-stabiliser tube D8, described charging capacitor C13 positive pole, for accepting the charging voltage of triode Q6 collector electrode and triode Q5 collector electrode, after charging voltage is greater than voltage-stabiliser tube D8 operating voltage, controls controlled silicon conducting.
Further, this protective device is also provided with Overtemperature protection circuit.
(3) beneficial effect
Compared with prior art; the present invention has the following advantages: replace mechanical switch switch with electronics interlock switch; E-N terminal voltage detecting and current detecting is utilized to realize Bidirectional interlocking and unblock; only have and meet E-N terminal voltage > predeterminated voltage simultaneously; electric current > predetermined current; then starting protection, otherwise be in monitoring holding state constantly, under solving varying environment, self adaptation switches to voltage-type or current mode.
Accompanying drawing explanation
Fig. 1 is the circuit theory module map that automatically can identify switched voltage current mode leakage protector device of the present invention.
Fig. 2 is the circuit theory schematic diagram that automatically can identify switched voltage current mode leakage protector device of the present invention;
Fig. 3 is the circuit theory diagrams of embodiment two.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment one
As depicted in figs. 1 and 2, the present invention proposes one can identify switched voltage current mode leakage protector device automatically, comprise release, indicator light circuit, amplifying circuit and controllable silicon SCR 1, also comprise optocoupler testing circuit, voltage detecting circuit 1 and current detection circuit 2; Described optocoupler testing circuit is used for driving voltage testing circuit 1, and described voltage detecting circuit 1 and current detection circuit 2 switch mutually.
Wherein, indicator light circuit is made up of LED 2 and resistance R12, and amplifying circuit comprises earth leakage protective device special chip U2, and amplifying circuit also connects by zero sequence current mutual inductor ZCT1, for detecting zero live wire drain conditions.
Described voltage detecting circuit 1 comprises triode Q2, triode Q3, triode Q6, triode Q7 and triode Q11, described triode Q2 base stage connecting triode Q7 emitter, described triode Q3 base stage is controlled by photoelectric coupled circuit, the base stage of described triode Q3 collector electrode connecting triode Q7, is provided with resistance R4 between described triode Q6 and triode Q7; The base stage of described triode Q11 collector electrode connecting triode Q6, is provided with resistance R2 between the collector electrode of described triode Q11 and triode Q2 collector electrode; The base stage of described triode Q11 is controlled by current detection circuit 2.
Described current detection circuit 2 comprises triode Q4, triode Q5, triode Q8, triode Q9, triode Q10, triode Q12 and ground wire instrument transformer ZCT2; Described ground wire instrument transformer ZCT2 is for responding to ground wire electrical leakage voltage, described triode Q8 base stage is controlled by ground wire instrument transformer ZCT2, the base stage of described triode Q4 is controlled by triode Q8, the collector electrode connecting triode Q9 base stage of triode Q4, the collector electrode of described triode Q5 base stage connecting triode Q9; The collector electrode of described triode Q10 base stage connecting triode Q12, the base stage of described triode Q12 is controlled by the collector electrode of triode Q2, and described triode Q11 base stage is controlled by triode Q5; Described triode Q10 base stage is controlled by triode Q5.
Described photoelectric coupled circuit comprises optocoupler U1, LED 1, electric capacity C2, resistance R10 and diode D1, wherein LED 1 is arranged between optocoupler U1 first input end and zero line, and described electric capacity C2 and resistance R10 is arranged between ground wire and second input of optocoupler U1 after connecting; Described diode D1 positive pole connecting to neutral line, negative pole connecting resistance R10.
This circuit is also provided with charging capacitor C13 and voltage-stabiliser tube D8, and described charging capacitor C13 positive pole, for accepting the charging voltage of triode Q6 collector electrode and triode Q5 collector electrode, after charging voltage is greater than voltage-stabiliser tube D8 operating voltage, controls controllable silicon SCR 1 conducting.
This protective device is also provided with Overtemperature protection circuit; Overtemperature protection circuit is made up of voltage-reference U3, triode Q1, thermistor RT1, divider resistance R19, R24 and R20; the reference voltage of voltage-reference U3 connects thermistor RT one end; diminish when thermistor RT experiences pin heating resistance; during to preset temperature, reference voltage rises to voltage-reference U3 and works, Q1 conducting; thus by Q1, controllable silicon SCR 1 is worked, last release open circuit.
This circuit is also provided with indicator light LED3, is used for representing that ground wire has the situation of electric current, and now, the present invention automatically switches into voltage protection scheme.
Be described in detail operation principle of the present invention below in conjunction with circuit diagram 2 and foregoing circuit principle and function, the present invention possesses following functions:
1 load zero, phase line earth leakage protective
After protector plug access 220V input power, pressure presses return unit switch S 1, S2 closes, work indication LED 2 is lighted, supply voltage through dropout solenoid L1, D2 rectification, R13 current limliting, C7 filtering, supplies U2 chip and makes to obtain electricity work (this process hereinafter referred: protector obtains electricity work) after D3 voltage stabilizing; When load end (output) Lo or No arbitrary end exports electric leakage, mutual inductor ZCT1 exports induced voltage, send into 1 and 2 pin that U2 detects drive circuit respectively, when leakage current reaches preset value, 7 pin export high level through D4 to control machines pole, controlled silicon conducting, and the adhesive of L1 solenoid drives tripping mechanism to make closing contact (S1, S2) disconnect, cut off the effect that load power source plays safeguard protection;
2 earth wire charged protectings (E end/voltage-type automatically switches into current mode)
Protector obtains electricity work, ground wire E electrified voltage is through C2, R10, U1 (optocoupler), LED1 and N end forms loop, when N-E end band electric strength reaches preset value, optocoupler U1 conducting causes Q3, Q7, Q2 conducting, meanwhile the On current of Q2 makes Q6 conducting through R2, the current-limiting resistance R4 output current of Q7 output is caused to force short circuit to cause voltage-type to force shielding to use, meanwhile, Q2 output current makes Q12 force conducting to cause Q10 to be in cut-off state through R7, current mode is allowed to enter mode of operation and continue to be in amperometric detection mode, when E-Eo end has predetermined current to flow through, ZCT2 responds to output and causes Q8 conducting, Q4, Q9, Q5 conducting, conducting because of Q12 causes Q10 to end, R9 has electric current to export, the On current of Q5 is through R5 to Q11 conducting simultaneously, Q6 is caused to end, Q7 electric current exports through R4, this process causes voltage to interlock releasing, at voltage, under electric current common mode, D5, D6 charges to electric capacity C13, after charging voltage is greater than D8 terminal voltage, On current acts on controllable silicon SCR 1 conducting through D7, the adhesive of L1 solenoid drives tripping mechanism to make closing contact (S1, S2) disconnect, cut off the effect that load power source plays safeguard protection,
3 earth wire charged protectings (E end/current mode automatically switches into voltage-type)
Protector obtains electricity work, the charged electric current of ground wire E through ZCT2 mutual inductor to Eo, mutual inductor induction output voltage makes Q8 conducting, Q4, Q9, Q5 conducting, wherein Q5 On current makes Q10 conducting through R6, R9 output end current forces short circuit, meanwhile, Q5 electric current makes Q11 conducting through R5, Q6 forces cut-off, allow to be operated in voltage operation mode, and continue to be in voltage detecting state, when E-N end have reach predeterminated voltage time, optocoupler conducting, Q3, Q7, Q2 conducting, Q2 On current makes Q10 end through R7 to Q12 conducting and achieves electric current interlocking releasing, at voltage, under electric current common mode, D5, D6 charges to electric capacity C13, after charging voltage is greater than D8 terminal voltage, On current acts on controllable silicon SCR 1 conducting through D7, the adhesive of L1 solenoid drives tripping mechanism to make closing contact (S1, S2) disconnect, cut off the effect that load power source plays safeguard protection,
4 protector plug overtemperature protes
Protector obtains electricity work; when overtemperature protection device detects that protector plug temperature reaches preset temperature; C7 voltage is through R19; RT1 delivers to U3, and the conducting of the U3 degree of depth causes Q1 conducting, and On current triggers SCR1; controlled silicon conducting; the adhesive of L1 solenoid drives tripping mechanism that closing contact (S1, S2) is disconnected, and cuts off the effect that load power source plays safeguard protection.
The present invention possesses features:
1, automatically identify according to different power utilization environments and enter voltage or current-mode, without the need to manual switching;
2, when E-N voltage, when E-Eo electric current is all less than preset value, circuit is in monitoring state;
When 3, having voltage in the ban, voltage detecting self-locking, automatically switch into current mode and leak guarantor's work, when electric current is greater than preset value, remove voltage self-locking, and again judge electric current whether > pre-set current value, therewith cycle criterion voltage, whether electric current is greater than preset value, only has to meet then to perform protection simultaneously; Otherwise automatically adapt to present mode work;
When 4, having electric current in the ban, current detecting self-locking, automatically switch into voltage-type and leak guarantor's work, when voltage is greater than preset value, remove electric current self-locking, and again judge voltage whether > preset voltage value, therewith cycle criterion electric current, whether voltage is greater than preset value, only has to meet then to perform protection simultaneously; Otherwise automatically adapt to present mode work;
5, work as voltage, electric current is all greater than preset value, then protect immediately;
6, LED3 indicator light: energising and bright expression ground wire have electric current, automatically switch into voltage protection scheme; Work midway is lighted and is represented ground wire voltage > preset value, and ground line current is close to preset value.
Instant invention overcomes the defect utilizing change over switch artificially to select type of detection, be highly suitable for power utilization environment changeable when use.
Embodiment two
The present embodiment is substantially identical with embodiment one, and difference is: the resistance R10 in Fig. 2 can replace with diode D10, and object is to have prevented backward current from flowing through diode D10, and physical circuit schematic diagram is see Fig. 3.
This protective device is also provided with Overtemperature protection circuit.Below be only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. automatically can identify a switched voltage current mode leakage protector device, comprise release, indicator light circuit, amplifying circuit and controllable silicon, it is characterized in that: also comprise optocoupler testing circuit, voltage detecting circuit and current detection circuit; Described optocoupler testing circuit is used for driving voltage testing circuit, and described voltage detecting circuit and current detection circuit switch mutually.
2. according to claim 1ly automatically can identify switched voltage current mode leakage protector device, it is characterized in that: described voltage detecting circuit comprises triode Q2, triode Q3, triode Q6, triode Q7 and triode Q11, described triode Q2 base stage connecting triode Q7 emitter, described triode Q3 base stage is controlled by photoelectric coupled circuit, the base stage of described triode Q3 collector electrode connecting triode Q7, is provided with resistance R4 between described triode Q6 and triode Q7; The base stage of described triode Q11 collector electrode connecting triode Q6, is provided with resistance R2 between the collector electrode of described triode Q11 and triode Q2 collector electrode; The base stage of described triode Q11 is controlled by current detection circuit.
3. according to claim 2ly automatically can identify switched voltage current mode leakage protector device, it is characterized in that: described current detection circuit comprises triode Q4, triode Q5, triode Q8, triode Q9, triode Q10, triode Q12 and ground wire instrument transformer; Described ground wire instrument transformer is for responding to ground wire electrical leakage voltage, described triode Q8 base stage is controlled by ground wire instrument transformer, the base stage of described triode Q4 is controlled by triode Q8, the collector electrode connecting triode Q9 base stage of triode Q4, the collector electrode of described triode Q5 base stage connecting triode Q9; The collector electrode of described triode Q10 base stage connecting triode Q12, the base stage of described triode Q12 is controlled by the collector electrode of triode Q2, and described triode Q11 base stage is controlled by triode Q5; Described triode Q10 base stage is controlled by triode Q5.
4. according to claim 3ly automatically can identify switched voltage current mode leakage protector device, it is characterized in that: described photoelectric coupled circuit comprises optocoupler U1, LED 1, electric capacity C2, resistance R10 and diode D1, wherein LED 1 is arranged between optocoupler U1 first input end and zero line, and described electric capacity C2 and resistance R10 is arranged between ground wire and second input of optocoupler U1 after connecting; Described diode D1 positive pole connecting to neutral line, negative pole connecting resistance R10.
5. according to claim 4ly automatically can identify switched voltage current mode leakage protector device; it is characterized in that: this circuit is also provided with the controllable silicon drive circuit comprising charging capacitor C13 and voltage-stabiliser tube D8; described charging capacitor C13 positive pole is for accepting the charging voltage of triode Q6 collector electrode and triode Q5 collector electrode; after charging voltage is greater than voltage-stabiliser tube D8 operating voltage, control controlled silicon conducting.
6. automatically can identify switched voltage current mode leakage protector device according to any one of claim 1 to 5, it is characterized in that: this protective device is also provided with Overtemperature protection circuit.
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| CN201510239428.6A CN104795790B (en) | 2015-03-27 | 2015-05-12 | Can automatic identification switching voltage x current type earth leakage protective device device |
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| CN201510137982 | 2015-03-27 | ||
| CN2015101379823 | 2015-03-27 | ||
| CN201510239428.6A CN104795790B (en) | 2015-03-27 | 2015-05-12 | Can automatic identification switching voltage x current type earth leakage protective device device |
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| CN104795790B CN104795790B (en) | 2017-08-25 |
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| WO2017215509A1 (en) * | 2016-06-12 | 2017-12-21 | 上海电科电器科技有限公司 | Switching apparatus for residual current circuit breaker |
| CN108011256A (en) * | 2016-12-20 | 2018-05-08 | 芜湖美的厨卫电器制造有限公司 | Leakage protecting plug and electric heater |
| CN109709373A (en) * | 2018-12-24 | 2019-05-03 | 内蒙古电力(集团)有限责任公司电力调度控制分公司 | A kind of signal adaptive Acquisition Circuit and acquisition method |
| CN111486599A (en) * | 2020-03-20 | 2020-08-04 | 广东万家乐燃气具有限公司 | Electric water heater electric leakage detection system and electric water heater |
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| CN111486599B (en) * | 2020-03-20 | 2021-05-14 | 广东万家乐燃气具有限公司 | Electric water heater electric leakage detection system and electric water heater |
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