CN204967233U - Low temperature rise security residual current operated circuit breaker circuit - Google Patents
Low temperature rise security residual current operated circuit breaker circuit Download PDFInfo
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- CN204967233U CN204967233U CN201520642961.2U CN201520642961U CN204967233U CN 204967233 U CN204967233 U CN 204967233U CN 201520642961 U CN201520642961 U CN 201520642961U CN 204967233 U CN204967233 U CN 204967233U
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Abstract
Low temperature rise security residual current operated circuit breaker circuit, including power supply circuit, electric leakage signal acquisition control circuit, trip circuit and earth -leakage detection circuit, electric leakage signal acquisition control circuit monitoring main circuit whether residual current appears to control drive when residual current appearing the trip circuit action of carry out threading off, power supply circuit's NULL side and main circuit connection, power supply circuit's direct current output side provides the DC voltage with electric leakage signal acquisition control circuit and dropout circuit connection respectively, power supply circuit include surge snubber circuit, half -wave rectifier circuit and reduction voltage circuit, surge snubber circuit's input and main circuit connection, the output is connected with half -wave rectifier circuit, the half -wave rectifier circuit output respectively with dropout circuit connection and step -down circuit connection, the reduction voltage circuit and the signal acquisition that leaks electricity control circuit connection. Have that step -down resistance temperature is low, the antisurge can the reinforce, beneficial effect with low costs.
Description
Technical field
The utility model belongs to Low Voltage Electrical Apparatus, relates to a kind of residual current action breaker with overcurrent protection, is specifically related to the circuit of the residual current action breaker being with overcurrent protection.
Background technology
At present the power circuit of this type of circuit breaker generally adopts the form of full-wave rectification, resistance-capacitance depressurization or resistance step-down, voltage wherein after full-wave rectification is higher, and full-wave rectifying circuit adopts four rectifier diodes, it is many unfavorable to bring cost and the miniaturization etc. of electric sub-member plate; And the operationally temperature rise of resistance reduction voltage circuit, affect reliability and element useful life of circuit working; Although temperature rise is low during capacitance-resistance voltage reduction circuit work, cost is higher.Product anti-lightning surge capacity simultaneously on market is lower, generally can not bear 4KV surge impact, can not meet the reliability of user to product and the primary demand of fail safe.
Utility model content
In order to overcome the defect of prior art, the purpose of this utility model is to provide the low-temperature-rise fail safe residual current action breaker circuit that a kind of dropping resistor temperature is low, Surge handling capability is strong, cost is low, performance is high, components and parts are few.
For achieving the above object, the utility model have employed following technical scheme:
A kind of low-temperature-rise fail safe residual current action breaker circuit, comprise power circuit, the electric leakage signal acquisition control circuit be connected with the secondary coil of zero-sequence transformer TA, the leakage tests circuit of trip circuit and the whether effective residual current of trip action for generation of analog detection circuit breaker, whether described electric leakage signal acquisition control circuit monitoring main circuit there is residual current, and the trip circuit controlled when there is residual current described in driving performs trip action, the interchange input side of described power circuit is connected with main circuit, the DC output side of power circuit is connected with electric leakage signal acquisition control circuit and trip circuit respectively provides direct voltage, described power circuit comprises surge absorbing circuit, half-wave rectifying circuit and reduction voltage circuit, the input of surge absorbing circuit is connected with main circuit, output is connected with half-wave rectifying circuit, half-wave rectifying circuit output is connected with trip circuit respectively and reduction voltage circuit connects, and reduction voltage circuit is connected with electric leakage signal acquisition control circuit.
Preferably; the reduction voltage circuit of described power circuit comprises one end and to connect to neutral the electric capacity C8 of N and the paster type resistor module that combined by multiple Chip-R; one end of described paster type resistor module is connected with the other end of electric capacity C8; formed for controlling the DC control output node of threading off and protecting that leaks electricity; this node is connected with described electric leakage signal acquisition control circuit, the above-mentioned other end of paster type resistor module and the connection of trip circuit.
Preferably, the surge absorbing circuit of described power circuit comprises piezo-resistance RV1, between the live wire L that it is connected in the interchange input side of power circuit in parallel and neutral line N.
Preferably, the half-wave rectifying circuit of described power circuit comprises diode VD1, the positive pole of described diode VD1 is connected with the live wire L of the interchange input side of power circuit, the negative pole of this diode VD1 is connected with the other end of the paster type resistor module of reduction voltage circuit, and is connected in parallel with the anode of the controllable silicon VT1 of described trip circuit.
Preferably, the paster type resistor module of described reduction voltage circuit is connected in series by multiple Chip-R and forms.
Preferably, the paster type resistor module of described reduction voltage circuit is connected in parallel by multiple series patch resistor group and forms.
Preferably, the paster type resistor module of described reduction voltage circuit is connected in series by multiple Chip-R group in parallel and forms.
Preferably, described paster type resistor module comprises by Chip-R R5, Chip-R R6, Chip-R R7 and Chip-R R8 the first series patch resistor group in series and by Chip-R R9, Chip-R R10, Chip-R R11 and Chip-R R12 the second series patch resistor group in series, and first connects series patch resistor group and second connects series patch resistor group and be connected in parallel.
Preferably, described paster type resistor module comprises the first Chip-R group in parallel be made up of Chip-R R5 and Chip-R R6 parallel connection, the the second Chip-R group in parallel be made up of Chip-R R7 and Chip-R R8 parallel connection, the 3rd Chip-R group in parallel be made up of Chip-R R9 and Chip-R R10 parallel connection and the 4th Chip-R group in parallel be made up of Chip-R R11 and Chip-R R12 parallel connection, described first Chip-R group in parallel, second Chip-R group in parallel, 3rd Chip-R group in parallel and the 4th Chip-R group in parallel are sequentially connected in series.
Preferably, described electric leakage signal acquisition control circuit comprises bidirectional diode D1, debugging resistance R1, resistance R2, resistance R3 and electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, control chip and zero-sequence transformer TA; Debugging resistance R1, bidirectional diode D1, electric capacity C1 be the two ends that go between at the secondary circuit of zero-sequence transformer TA of parallel connection successively; One end of resistance R2 is connected with one end of electric capacity C1, the other end of resistance R2 and one end of electric capacity C2, one end of electric capacity C3 and the first pin one parallel connection of control chip; One end of resistance R3 is connected with the other end of electric capacity C1, and the other end of resistance R3 is connected with the other end of electric capacity C2, the second pin two parallel connection of one end of electric capacity C4 and control chip; Three-prong 3 earth of the other end of electric capacity C3 and the other end of electric capacity C4 and control chip; One end of electric capacity C5 and the 4th pin 4 of control chip and the 5th pin 5 parallel connection, the other end ground connection of electric capacity C5; One end of electric capacity C6 is connected with the 6th pin 6 of control chip, the G pole parallel connection of the other end of electric capacity C6 and the 7th pin 7 of control chip, one end of electric capacity C7 and the controllable silicon VT1 in dropout loop, the other end ground connection of electric capacity C7; 8th pin 8 of control chip is connected with the DC control output node of power circuit.
The beneficial effects of the utility model comprise: due to surge absorbing circuit, the structure of the power circuit that half-wave rectifying circuit and reduction voltage circuit are formed, and reduction voltage circuit adopts the structure of paster type resistor module, and by with electric leakage signal acquisition control circuit, trip circuit, the reasonable combination of leakage tests circuit, significantly can reduce the step-down burden of reduction voltage circuit and the temperature rise of circuit, effectively can reduce the volume of circuit and simplify the structure of optimized circuit, expand and improve the ability of bearing surge impact, the reliability of effective improving product while rationally reducing production cost, the grade of fail safe.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of low-temperature-rise fail safe residual current action breaker circuit of the present utility model.
Fig. 2 is the electrical block diagram of the first embodiment of the first execution mode of the paster type resistor module of the reduction voltage circuit of low-temperature-rise fail safe residual current action breaker circuit of the present utility model.
Fig. 3 is the electrical block diagram of the second embodiment of the first execution mode of the paster type resistor module of the reduction voltage circuit of low-temperature-rise fail safe residual current action breaker circuit of the present utility model.
Fig. 4 is the electrical block diagram of the second execution mode of the paster type resistor module of the reduction voltage circuit of low-temperature-rise fail safe residual current action breaker circuit of the present utility model.
Fig. 5 is the electrical block diagram of the third execution mode of the paster type resistor module of the reduction voltage circuit of low-temperature-rise fail safe residual current action breaker circuit of the present utility model.
Embodiment
Below in conjunction with the embodiment that accompanying drawing 1 to 5 provides, further illustrate the embodiment of low-temperature-rise fail safe residual current action breaker circuit of the present utility model.
See the structured flowchart of Fig. 1, low-temperature-rise fail safe residual current action breaker of the present utility model comprises electric leakage signal acquisition control circuit, trip circuit, leakage tests circuit and power circuit, the electric leakage signal acquisition control circuit of circuit breaker is used for the main circuit (L-L1 shown in surveillance map 5, N-N1) whether occur residual current, and control trip circuit actuate actuators part (tripping coil KA) performs trip action when there is residual current; Whether leakage tests circuit is for generation of simulation residual current, effective with the trip action detecting residual current action breaker.Feature of the present utility model is that power circuit comprises surge absorbing circuit, half-wave rectifying circuit and reduction voltage circuit; the input of surge absorbing circuit is connected with main circuit; output is connected with half-wave rectifying circuit; half-wave rectifying circuit output is connected with trip circuit respectively and reduction voltage circuit connects; reduction voltage circuit is connected with electric leakage signal acquisition control circuit; power circuit not only provides DC power supply to electric leakage signal acquisition control circuit, trip circuit, also has the surge protection function realized by surge absorbing circuit.Described power circuit is from main circuit L-L1, N-N1 gets alternating current, that is: the live wire L of the interchange input side of power circuit meets the live wire phase L-L1 of input main circuit, the neutral line N of the interchange input side of power circuit connects the neutral line phase (N-N1) of input main circuit, the positive pole of the DC output side of power circuit is used for providing direct voltage to electric leakage signal acquisition control circuit, trip circuit, and connect to neutral N in the earth polar (being also the common ground pole of residue action breaker power circuit) of the DC output side of power circuit.
Half-wave rectifying circuit of the present utility model comprises diode VD1, and the positive pole of diode VD1 is connected with the live wire L of the interchange input side of power circuit, and the anode of the controllable silicon VT1 of the negative pole of diode VD1 and one end of paster type resistor group, trip circuit is connected in parallel.The advantage of the half-wave rectifying circuit of diode VD1 is adopted to be that structure is simple, and VD low (being about 0.45 times of AC-input voltage), therefore the step-down burden of reduction voltage circuit can greatly be reduced, possibility is realized for reduction voltage circuit adopts paster type resistor module to provide, particularly half-wave rectifying circuit of the present utility model adopts diode VD1 and reduction voltage circuit to adopt the textural association of paster type resistor module, effectively can not only reduce temperature rise, and very favourable to the miniaturization of circuit, can the effectively reliability of improving product, the grade of fail safe.
Another useful feature of the present utility model is that the reduction voltage circuit of power circuit have employed paster type resistor module, the paster type resistor module that described reduction voltage circuit comprises electric capacity C8 and combined by multiple Chip-Rs of such as R5 to R12, one end of paster type resistor module is connected with one end of electric capacity C8, formed for controlling the DC control output node of threading off and protecting that leaks electricity, this node is connected with the 8th pin 8 of the control chip of electric leakage signal acquisition control circuit, the anode of the negative pole of the other end of paster type resistor module and the diode VD1 of half-wave rectifying circuit and the controllable silicon VT1 of trip circuit is connected in parallel, the other end ground connection of electric capacity C8.The concrete structure of paster type resistor module can have various ways.The first execution mode that the paster type resistor module being reduction voltage circuit shown in Fig. 2,3 adopts, they represent two different connection modes respectively.In Fig. 2, one end of tripping coil KA of trip circuit is connected in parallel with the live wire L exchanging input side of power circuit with one end of the piezo-resistance RV1 of surge absorbing circuit, and the other end of tripping coil KA is connected with the positive pole of the diode VD1 of half-wave rectifying circuit.And one end of tripping coil KA and the other end of the piezo-resistance RV1 of surge absorbing circuit are connected with the neutral line N parallel exchanging input side of power circuit in Fig. 3, the other end of tripping coil KA is connected with the K pole of the controllable silicon VT1 of trip circuit.And Fig. 4,5 is depicted as second and third kind of execution mode of paster type resistor module.The advantage of the paster type resistor module adopting multiple Chip-R to combine is: voltage and the temperature rise that can reduce each Chip-R at double; Particularly with connection in series-parallel (after first series connection as shown in Figure 2 more in parallel) or and the resistive module that combines of the mode of connecting (connecting again after first parallel connection as shown in Figure 5), can also avoid because one of them resistance failure causes product to be failure to actuate, thus improve the reliability and security of product.
Specifically, first kind of way is as illustrated in the embodiments of figures 2 and 3: the paster type resistor module of described reduction voltage circuit is connected in parallel by multiple series patch resistor group and forms, the paster type resistor module of described reduction voltage circuit is connected in parallel by 2 series patch resistor group and forms, wherein the first series patch resistor group is in series by Chip-R R5, Chip-R R6, Chip-R R7 and Chip-R R8, and the second series patch resistor group is in series by Chip-R R9, Chip-R R10, Chip-R R11 and Chip-R R12.The second way is as shown in Figure 4: the paster type resistor module of described reduction voltage circuit is connected in series by multiple Chip-R and forms, these Chip-Rs comprise Chip-R R5, Chip-R R6, Chip-R R7, Chip-R R8, Chip-R R9, Chip-R R10, Chip-R R11 and Chip-R R12.The third mode is as shown in Figure 5: the paster type resistor module of described reduction voltage circuit is connected in series by multiple Chip-R group in parallel and forms, wherein the first Chip-R group in parallel is made up of Chip-R R5 and the parallel connection of resistance R6 paster, second Chip-R group in parallel is made up of Chip-R R7 and Chip-R R8 parallel connection, 3rd Chip-R group in parallel is made up of Chip-R R9 and Chip-R R10 parallel connection, and the 4th Chip-R group in parallel is made up of Chip-R R11 and Chip-R R12 parallel connection.Three kinds of concrete structure optimal ways of paster type resistor module can be summarized as follows: the paster type resistor module of described reduction voltage circuit is connected in series by multiple Chip-R and forms; Or the paster type resistor module of described reduction voltage circuit is connected in parallel by multiple series patch resistor group and forms; Or the paster type resistor module of described reduction voltage circuit is connected in series by multiple Chip-R group in parallel and forms.
Another useful feature of the present utility model have employed surge absorbing circuit, that is: described surge absorbing circuit comprises piezo-resistance RV1, between the live wire L that it is connected in the interchange input side of power circuit in parallel and neutral line N, that is: one end of piezo-resistance RV1 is connected with live wire L, the other end of piezo-resistance RV1 and neutral line N.Because live wire L, neutral line N are connected with the live wire phase (L-L1) of main circuit, neutral line phase (N-N1) respectively; therefore the surge absoption function of piezo-resistance RV1 can not only protect low-temperature-rise fail safe residual current action breaker circuit, and can also the circuit in available protecting circuit breaker downstream.Due to the paster type resistor module that have employed surge absorbing circuit and match with it, greatly strengthen the ability of bearing surge impact, the surge voltage of the 4KV that existing mill run can not bear can be born.
The electric leakage signal acquisition control circuit of circuit breaker comprises bidirectional diode D1, debugging resistance R1, resistance R2, resistance R3 and electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, control chip and zero-sequence transformer TA; Debugging resistance R1, bidirectional diode D1, electric capacity C1 are connected in the two ends of the secondary circuit lead-in wire of zero-sequence transformer TA successively in parallel; One end of resistance R2 is connected with one end of electric capacity C1, and the other end of resistance R2 and one end of electric capacity C2, one end of electric capacity C3 and the first pin one of control chip are connected in parallel; One end of resistance R3 is connected with the other end of electric capacity C1, and the other end of resistance R3 is connected with the other end of electric capacity C2, one end of electric capacity C4 and the second pin two of control chip are connected in parallel; The other end of electric capacity C3 with the other end of electric capacity C4 and the three-prong 3 of control chip and be connected ground; One end of electric capacity C5 and the 4th pin 4 of control chip and the 5th pin 5 are connected in parallel, the other end ground connection of electric capacity C5; One end of electric capacity C6 is connected with the 6th pin 6 of control chip; the G pole (control pole) of the other end of electric capacity C6 and the 7th pin 7 of control chip, one end of electric capacity C7 and the controllable silicon VT1 of trip circuit is connected in parallel; the other end ground connection of electric capacity C7, the 8th pin 8 of control chip is connected with the DC control output node (being namely connected to form for controlling to leak electricity the DC control output node of threading off and protecting with one end of electric capacity C8 by one end of the paster type resistor module of reduction voltage circuit) of power circuit.Described control chip adopts the electronic device on market.
The trip circuit of circuit breaker comprises tripping coil KA, diode VD1 and controllable silicon VT1; The G pole (control pole) of controllable silicon VT1 connects the 7th pin 7 of control chip, the A pole (anode) of controllable silicon VT1 is connected to form on/off control circuit with the live wire L exchanging input side of power circuit with the neutral line N exchanging input side respectively with the K pole (negative electrode) of controllable silicon VT1, and tripping coil KA is connected in series in described on/off control circuit.Described on/off control circuit has turn-on and turn-off two states under the G pole of controllable silicon VT1 controls; At main circuit (L-L1, N-N1) under normal circumstances, electric leakage signal acquisition control circuit controls controllable silicon VT1 and turns off (making on/off control circuit be in off state), and the electric current be connected in series in the tripping coil KA in on/off control circuit can not encourage tripping coil to produce trip action; As main circuit (L-L1, when N-N1) there is residual current (leakage current), electric leakage signal acquisition control circuit controls controllable silicon VT1 conducting (triggering the conducting of on/off control circuit), be connected in series in the increase of the electric current in the tripping coil KA in on/off control circuit, so that excitation tripping coil produces trip action.The concrete structure of trip circuit can have various ways.A kind of preferred mode as shown in Figure 2, one end of tripping coil KA of described trip circuit is connected in parallel with the live wire L exchanging input side of power circuit with one end of the piezo-resistance RV1 of surge absorbing circuit, and the other end of tripping coil KA is connected with the positive pole of the diode VD1 of half-wave rectifying circuit.Another kind of preferred mode as shown in Figure 3, described one end of tripping coil KA is connected with the neutral line N parallel exchanging input side of power circuit with the other end of the piezo-resistance RV1 of surge absorbing circuit, and the other end of tripping coil KA is connected with the K pole (negative electrode) of the controllable silicon VT1 of trip circuit.The first embodiment that summary Fig. 2 and Fig. 3 provides and the second embodiment, the concrete structure of trip circuit can be summarized as: one end of tripping coil KA of described trip circuit is connected in parallel with the live wire L exchanging input side of power circuit with one end of the piezo-resistance RV1 of surge absorbing circuit, and the other end of tripping coil KA is connected with the positive pole of the diode VD1 of half-wave rectifying circuit; Or one end of tripping coil KA is connected with the neutral line N parallel exchanging input side of power circuit with the other end of the piezo-resistance RV1 of surge absorbing circuit, and the other end of tripping coil KA is connected with the negative electrode of the controllable silicon VT1 of trip circuit.
The test circuit of circuit breaker comprises often leaves Test Switchboard S1, resistance R4, often open Test Switchboard S1 and resistance R4 series connection and form circuit, this circuit is through being connected in parallel after zero-sequence transformer TA the live wire phase (L-L1) of main circuit with neutral line phase (N-N1).When people makes test circuit conducting for pressing Test Switchboard S1; the electric current flow through in test circuit can play the effect of simulation residual current; make induce residual current signal in the secondary circuit of zero-sequence transformer TA; this signal can trigger tripping coil KA and produce trip action, thus whether the dropout protection detecting circuit breaker is normal.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, some simple deduction or replace can also be made, all should be considered as belonging to protection range of the present utility model.
Claims (10)
1. a low-temperature-rise fail safe residual current action breaker circuit, comprise the leakage tests circuit of power circuit, the electric leakage signal acquisition control circuit be connected with the secondary coil of zero-sequence transformer TA, trip circuit and the whether effective residual current of trip action for generation of analog detection circuit breaker, whether described electric leakage signal acquisition control circuit monitoring main circuit there is residual current, and the trip circuit controlled when there is residual current described in driving performs trip action, it is characterized in that:
The interchange input side of described power circuit is connected with main circuit, and the DC output side of power circuit is connected with electric leakage signal acquisition control circuit and trip circuit respectively provides direct voltage; Described power circuit comprises surge absorbing circuit, half-wave rectifying circuit and reduction voltage circuit, the input of surge absorbing circuit is connected with main circuit, output is connected with half-wave rectifying circuit, half-wave rectifying circuit output is connected with trip circuit respectively and reduction voltage circuit connects, and reduction voltage circuit is connected with electric leakage signal acquisition control circuit.
2. low-temperature-rise fail safe residual current action breaker circuit according to claim 1; it is characterized in that: the reduction voltage circuit of described power circuit comprises one end and to connect to neutral the electric capacity C8 of N and the paster type resistor module that combined by multiple Chip-R; one end of described paster type resistor module is connected with the other end of electric capacity C8; formed for controlling the DC control output node of threading off and protecting that leaks electricity; this node is connected with described electric leakage signal acquisition control circuit, the above-mentioned other end of paster type resistor module and the connection of trip circuit.
3. low-temperature-rise fail safe residual current action breaker circuit according to claim 1, it is characterized in that: the surge absorbing circuit of described power circuit comprises piezo-resistance RV1, between the live wire L that it is connected in the interchange input side of power circuit in parallel and neutral line N.
4. low-temperature-rise fail safe residual current action breaker circuit according to claim 2, it is characterized in that: the half-wave rectifying circuit of described power circuit comprises diode VD1, the positive pole of described diode VD1 is connected with the live wire L of the interchange input side of power circuit, the negative pole of this diode VD1 is connected with the other end of the paster type resistor module of reduction voltage circuit, and is connected in parallel with the anode of the controllable silicon VT1 of described trip circuit.
5. low-temperature-rise fail safe residual current action breaker circuit according to claim 2, is characterized in that: the paster type resistor module of described reduction voltage circuit is connected in series by multiple Chip-R and forms.
6. low-temperature-rise fail safe residual current action breaker circuit according to claim 2, is characterized in that: the paster type resistor module of described reduction voltage circuit is connected in parallel by multiple series patch resistor group and forms.
7. low-temperature-rise fail safe residual current action breaker circuit according to claim 2, is characterized in that: the paster type resistor module of described reduction voltage circuit is connected in series by multiple Chip-R group in parallel and forms.
8. low-temperature-rise fail safe residual current action breaker circuit according to claim 6, it is characterized in that: described paster type resistor module comprises by Chip-R R5, Chip-R R6, Chip-R R7 and Chip-R R8 the first series patch resistor group in series and by Chip-R R9, Chip-R R10, Chip-R R11 and Chip-R R12 the second series patch resistor group in series, first connects series patch resistor group and second connects series patch resistor group and is connected in parallel.
9. low-temperature-rise fail safe residual current action breaker circuit according to claim 7, it is characterized in that: described paster type resistor module comprises the first Chip-R group in parallel be made up of Chip-R R5 and Chip-R R6 parallel connection, the the second Chip-R group in parallel be made up of Chip-R R7 and Chip-R R8 parallel connection, the 3rd Chip-R group in parallel be made up of Chip-R R9 and Chip-R R10 parallel connection and the 4th Chip-R group in parallel be made up of Chip-R R11 and Chip-R R12 parallel connection, described first Chip-R group in parallel, second Chip-R group in parallel, 3rd Chip-R group in parallel and the 4th Chip-R group in parallel are sequentially connected in series.
10. low-temperature-rise fail safe residual current action breaker circuit according to claim 1, is characterized in that: described electric leakage signal acquisition control circuit comprises bidirectional diode D1, debugging resistance R1, resistance R2, resistance R3 and electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, control chip and zero-sequence transformer TA; Debugging resistance R1, bidirectional diode D1, electric capacity C1 be the two ends that go between at the secondary circuit of zero-sequence transformer TA of parallel connection successively; One end of resistance R2 is connected with one end of electric capacity C1, the other end of resistance R2 and one end of electric capacity C2, one end of electric capacity C3 and the first pin parallel connection of control chip; One end of resistance R3 is connected with the other end of electric capacity C1, and the other end of resistance R3 is connected with the other end of electric capacity C2, the second pin parallel connection of one end of electric capacity C4 and control chip; The other end of electric capacity C3 and the other end of electric capacity C4 and the three-prong earth of control chip; One end of electric capacity C5 and the 4th pin of control chip and the 5th pin parallel connection, the other end ground connection of electric capacity C5; One end of electric capacity C6 is connected with the 6th pin of control chip, the G pole parallel connection of the other end of electric capacity C6 and the 7th pin of control chip, one end of electric capacity C7 and the controllable silicon VT1 in dropout loop, the other end ground connection of electric capacity C7; 8th pin of control chip is connected with the DC control output node of power circuit.
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| CN201520642961.2U CN204967233U (en) | 2015-08-24 | 2015-08-24 | Low temperature rise security residual current operated circuit breaker circuit |
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| CN201520642961.2U CN204967233U (en) | 2015-08-24 | 2015-08-24 | Low temperature rise security residual current operated circuit breaker circuit |
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| CN204967233U true CN204967233U (en) | 2016-01-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769159A (en) * | 2017-10-25 | 2018-03-06 | 浙江致威电子科技有限公司 | A kind of earth leakage protective device, electrical leakage detecting method and a kind of charging equipment |
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2015
- 2015-08-24 CN CN201520642961.2U patent/CN204967233U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769159A (en) * | 2017-10-25 | 2018-03-06 | 浙江致威电子科技有限公司 | A kind of earth leakage protective device, electrical leakage detecting method and a kind of charging equipment |
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