CN206878443U - Earth leakage protective device - Google Patents
Earth leakage protective device Download PDFInfo
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- CN206878443U CN206878443U CN201720523939.5U CN201720523939U CN206878443U CN 206878443 U CN206878443 U CN 206878443U CN 201720523939 U CN201720523939 U CN 201720523939U CN 206878443 U CN206878443 U CN 206878443U
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Abstract
A kind of earth leakage protective device, the input of power circuit are connected to power taking with external power supply respectively, and the output end of power circuit connects with control circuit；Also include ZCT TA, the input of electric-leakage detection circuit is connected with the both ends of ZCT TA secondary circuit lead, the output end of electric-leakage detection circuit and the input of control circuit connect, the signal collected is fed back into control circuit, the output end of control circuit is connected with trip circuit, and trip signal is provided for it；Also include temperature-sensitive device, temperature-sensitive device is connected in series in trip circuit or the front end of power circuit is used for lower protection circuit of nonserviceabling.The utility model earth leakage protective device; connected in the front end of trip circuit or power circuit and access temperature-sensitive device; tripping coil delayed releasing or power-off of not threading off under malfunction, high current caused by dropout is changed into high-impedance state by low current by temperature-sensitive device, dropout loop is opened a way.
Description
Technical field
Low Voltage Electrical Apparatus is the utility model is related to, more particularly to a kind of earth leakage protective device.
Background technology
RCCB leakage protection module mainly produces high current by turn on thyristors and drives dropout on Vehicles Collected from Market
Coil acts electrical apparatus release, product tripping operation.This mode generally existing problem：If electrical apparatus release is threaded off not in time or product goes out
Line termination power, coil burnout will be caused, controllable silicon is fried, and more seriously causes whole product to burn, to the quality of product and
User's use brings great harm.In the market has product using increasing disposable fuse, its not foot point：Generation is once protected
Afterwards, product will lose leakage function, and electric leakage such as occurs again will lose protection to human body, and harmfulness is also very big.
The content of the invention
A kind of the defects of the purpose of this utility model is to overcome prior art, there is provided simple and compact for structure, performance safety
It is stable, the low earth leakage protective device of cost.
To achieve the above object, the utility model employs following technical scheme：
A kind of earth leakage protective device, including power circuit, electric-leakage detection circuit, trip circuit and control circuit, the electricity
The input of source circuit is connected to power taking with external power supply respectively, and the output end of power circuit connects with control circuit, is it
Working power is provided；Also include ZCT TA, the input of electric-leakage detection circuit and ZCT TA secondary circuit
The both ends connection of lead, the output end of electric-leakage detection circuit and the input of control circuit connect, the signal collected are fed back
To control circuit, the output end of control circuit is connected with trip circuit, and trip signal is provided for it；Also include temperature-sensitive device, institute
State temperature-sensitive device and be connected in series in the front end of trip circuit or power circuit for lower protection circuit of nonserviceabling.
Further, the trip circuit includes tripping coil KA, and power circuit includes rectification circuit, and temperature-sensitive device is temperature-sensitive
Resistance；The input of rectification circuit is connected with power supply L phases and power supply N, and the output end of rectification circuit is connected with control circuit, takes off
Button is electrically connected between external power supply and rectification circuit, and tripping coil KA one end is connected with power supply L, the other end and rectification
The input connection of circuit；Thermistor is connected in series between rectification circuit and control circuit.
Further, the trip circuit includes tripping coil KA, and power circuit includes rectification circuit, and temperature-sensitive device is temperature-sensitive
Resistance；The input of rectification circuit is connected with power supply L phases and power supply N, and the output end of rectification circuit is connected with control circuit, takes off
Button is electrically connected between external power supply and rectification circuit, and tripping coil KA and thermistor are connected in series, temperature-sensitive electricity after series connection
One end of resistance is connected with power supply L, and tripping coil KA one end and rectification circuit input connect.
Further, the trip circuit includes tripping coil KA, and power circuit includes rectification circuit, and temperature-sensitive device is temperature-sensitive
Resistance；The input of rectification circuit is connected with power supply L1 phases, power supply L2 phases and power supply L3, and tripping coil KA is connected to rectified current
Between road and control circuit, the output end of rectification circuit is connected with trip circuit and control circuit；In every phase power input and
Thermistor is in series between the input of rectification circuit.
Further, the trip circuit includes tripping coil KA, and power circuit includes rectification circuit, and temperature-sensitive device is temperature-sensitive
Resistance；The input of rectification circuit is connected with power supply L1 phases, power supply L2 phases and power supply L3, tripping coil KA and thermistor string
Connection is connected between rectification circuit and control circuit, and the output end of rectification circuit is connected with trip circuit and control circuit.
Further, the trip circuit also includes diode VD8, diode VD8 one end and piezo-resistance RT one end
Connection, the other end are connected with tripping coil KA one end.
Further, the control circuit includes controllable silicon VT1 and controllable silicon VT2, controllable silicon VT1 and controllable silicon VT2 series connection
Connection, one end after series connection are connected with trip circuit, and the other end is connected with power circuit, controllable silicon VT1 G poles and controllable silicon
VT2 G poles are connected with electric-leakage detection circuit respectively, are led simultaneously to controllable silicon VT1 and controllable silicon VT2 outputs by control chip IC
Messenger could turn on；Electric-leakage detection circuit directly monitors the residual current of main circuit by ZCT TA, when electric leakage is examined
For slowdown monitoring circuit when detecting residual current, control trip circuit performs the trip action of breaker；The control circuit also includes
Diode VD7 and resistance R4, diode VD7 positive pole are connected with electric-leakage detection circuit, and diode VD7 negative pole is with resistance R4's
One end is connected, and the resistance R4 other end is connected with controllable silicon VT1 G poles, and controllable silicon VT1 positive pole is connected with trip circuit, can
Control silicon VT1 negative pole is connected with controllable silicon VT2 positive pole, and controllable silicon VT2 negative pole is connected with power circuit, controllable silicon VT2 G
Pole is connected with electric-leakage detection circuit.
Further, the electric-leakage detection circuit includes resistance R1, bilateral diode D1, resistance R2, resistance R3, electric capacity C1,
Electric capacity C2, electric capacity C3, electric capacity C5, electric capacity C4 and control chip IC；The power supply L1 phases, power supply L2 phases, power supply L3 phase conductors are worn
Cross ZCT TA, resistance R2 and resistance R3 be connected in series in respectively ZCT TA secondary coil both ends and control
Between the first pin and the second pin of chip IC, bilateral diode D1 and debugging resistance R1 are connected in resistance R2 and resistance in parallel
For R3 close to ZCT TA side, electric capacity C1 is connected in resistance R2 and resistance R3 opposite side, electric capacity C2 one end in parallel
It is connected respectively with control chip IC the 4th pin and the 5th pin, the electric capacity C2 other end and control chip IC three-prong
Connection, electric capacity C3 both ends are connected in parallel between control chip IC three-prong and the 6th pin respectively, and the two of electric capacity C4
End is connected in parallel between control chip IC three-prong and the 7th pin respectively, and electric capacity C5 both ends are connected in parallel respectively
Between control chip IC three-prong and the 8th pin；Control chip IC the 7th pin and the 8th pin connect with control circuit
Connect, control chip IC the 8th pin is connected with power circuit.
Further, the power circuit also includes surge absorbing circuit and reduction voltage circuit；Surge absorbing circuit is distinguished
With power supply L1 phases, power supply L2 phases are connected with power supply L3, and surge absoption protection is carried out to each phase voltage；The output of surge absorbing circuit
End is connected with the input of rectification circuit, and the output end of rectification circuit and the input of reduction voltage circuit connect, by the electricity after rectification
Pressure is depressured, and the output end of reduction voltage circuit is connected with electric-leakage detection circuit, and voltage after decompression is supplied into electric-leakage detection circuit.
Further, the surge absorbing circuit includes piezo-resistance RV1, piezo-resistance RV2, piezo-resistance RV3 and pressure-sensitive
Resistance RV4, piezo-resistance RV3 are connected in parallel between power supply L3 phases and power supply L1 phases, and piezo-resistance RV2 is connected in power supply in parallel
Between L2 phases and power supply L3 phases, piezo-resistance RV1 is connected in parallel between power supply L1 phases and power supply L2 phases, and piezo-resistance RV4 is simultaneously
Connection is connected to the both ends of rectification circuit and trip circuit, and to passing through piezo-resistance RV1, piezo-resistance RV2, piezo-resistance RV3 inhale
The residual voltage received carries out double absorption；The rectification circuit is full-wave rectification, including diode VD1, diode VD2, two
Pole pipe VD3, diode VD4, diode VD5 and diode VD6；Diode VD1 and diode VD2, diode VD3 and diode
VD4, diode VD5 and diode VD6 are connected in parallel after being connected in series respectively, and one end after parallel connection connects with trip circuit
Connect, diode VD1 and diode VD2 intermediate node are connected with power supply L1, diode VD3 and diode VD4 middle node
Point is connected with power supply L2, and diode VD5 and diode VD6 intermediate node are connected with power supply L3；The reduction voltage circuit bag
Include resistance R5 and resistance R6；One end of one end and rectification circuit after resistance R5 and resistance R6 series connection connects, the other end and electric leakage
Detect circuit connection.
The utility model earth leakage protective device, access temperature-sensitive device of being connected in the front end of trip circuit or power circuit,
Under normal condition, the tripping coil of trip circuit is completed to thread off within the extremely short time and powered off, (electrical apparatus release itself under malfunction
Failure is not threaded off or product outlet termination power) tripping coil delayed releasing or power-off of not threading off, dropout loop exist always
High current, high current caused by dropout is changed into high-impedance state by low current by temperature-sensitive device, control circuit is disconnected, makes dropout
Open a way in loop.The utility model earth leakage protective device, two controllable silicon VT1 and controllable silicon are accessed by being connected in control circuit
VT2, controllable silicon VT1 G poles and controllable silicon VT2 G poles are connected with control chip IC respectively, it is necessary to which control chip IC needs simultaneously
Controllable silicon VT2 and controllable silicon VT1 conductings are triggered, control circuit could send trip signal to trip circuit and perform the de- of breaker
Work is pulled, the precision of earth leakage protective device is high, and security performance is high, and stability is high.
Brief description of the drawings
Fig. 1 is protection circuit before the utility model single-phase electricity rectified current；
Fig. 2 is protection circuit after the utility model single-phase electricity rectified current；
Fig. 3 is protection circuit before the utility model three-phase four-wire system rectified current；
Fig. 4 is protection circuit after the utility model three-phase four-wire system rectified current；
Fig. 5 is the physical circuit figure of the utility model three-phase electricity breaker circuit.
Embodiment
The embodiment provided below in conjunction with accompanying drawing 1 to 5, further illustrate the specific of earth leakage protective device of the present utility model
Embodiment.Earth leakage protective device of the present utility model is not limited to the following description.
As Figure 1-5, a kind of embodiment of RCCB, it includes power circuit, electric-leakage detection circuit, electricity of threading off
Road, control circuit and leakage testses circuit.The input of the power circuit is connected to power taking, power supply with external power supply respectively
The output end of circuit is connected with control circuit, and working power is provided for it；Also include ZCT TA, electric-leakage detection circuit
Input is connected with the both ends of ZCT TA secondary circuit lead, the output end of electric-leakage detection circuit and control circuit
Input connects, and the signal collected is fed back into control circuit, the output end of control circuit is connected with trip circuit, carried for it
For trip signal；Also include temperature-sensitive device, the temperature-sensitive device is connected in series in trip circuit or the front end of power circuit is used
In lower protection circuit of nonserviceabling.The utility model earth leakage protective device, gone here and there in the front end of trip circuit or power circuit
Couple into temperature-sensitive device, under normal condition, the tripping coil of trip circuit completes power-off of threading off, failure shape within the extremely short time
(electrical apparatus release faults itself is not threaded off or product outlet termination power) tripping coil delayed releasing or power-off of not threading off under state, take off
There is high current in button loop, high current caused by dropout is changed into low current in high-impedance state by temperature-sensitive device always, disconnect
Control circuit, dropout loop is set to open a way.
Temperature-sensitive device of the present utility model uses thermistor, and simple in construction, cost is low.Thermistor feature and effect
For：Thermistor is a kind of overcurrent electrical protection component, at low currents in low resistance state, is also within the extremely short time
Low resistance state, to the regular hour in be in high-impedance state.Using this feature, reach defencive function, this function is alternatively referred to as from extensive
Double insurance silk：
1, electric leakage product normal work is in low resistance state by low current, thermistor, does not influence normal work.
2, in moment (in very short time) of threading off, thermistor is in low resistance state, does not influence product and normally threads off.
3, when more than certain time, this time in the range of tripping coil and IGCT can be born, thermistor
In high-impedance state, high current caused by dropout is changed into low current in time, simultaneously closes off turn on thyristors, be effectively protected dropout
The damage of coil and IGCT.In the state of thermistor is due to low current, low resistance state is reverted to again, enables the normal work of product
Make.
As shown in Figure 1, 2, external power supply inputs for single phase poaer supply, including power supply L phases and power supply N phases.The trip circuit
Including tripping coil KA, power circuit includes rectification circuit, and temperature-sensitive device is thermistor.
Specifically, as shown in figure 1, the input of rectification circuit is connected with power supply L phases and power supply N, rectification circuit it is defeated
Go out end to be connected with control circuit, trip circuit is connected between external power supply and rectification circuit, tripping coil KA one end and electricity
Source L is connected, the input connection of the other end and rectification circuit；Thermistor is connected in series in rectification circuit and control electricity
Between road.Obviously, the front end of access rectification circuit as shown in Fig. 2 tripping coil KA and thermistor can also connect together, threads off
Coil KA and thermistor are connected in series, and one end of thermistor is connected with power supply L after series connection, tripping coil KA one end with
The input connection of rectification circuit.
As shown in Figure 3,4, external power supply inputs for three-phase four-wire power, including power supply L1 phases, power supply L2 phases and power supply L3
Phase.The trip circuit includes tripping coil KA, and power circuit includes rectification circuit, and temperature-sensitive device is thermistor.
Specifically, as shown in figure 3, the input of rectification circuit is connected with power supply L1 phases, power supply L2 phases and power supply L3, take off
Fastening wire circle KA and thermistor are connected in series between rectification circuit and control circuit, the output end and trip circuit of rectification circuit
Connected with control circuit.Obviously, as shown in Figure 4, or tripping coil KA is connected between rectification circuit and control circuit,
The output end of rectification circuit is connected with trip circuit and control circuit；The input of every phase power input and rectification circuit it
Between connect a thermistor.
It is clear that in the case where external power supply is single phase poaer supply and three phase mains inputs, tripping coil KA can both be set
The rear end of rectification circuit can be also located in the front end of rectification circuit.
The specific embodiment of the utility model residual current action breaker is provided with reference to Fig. 3 and Fig. 5.
As shown in figure 5, the trip circuit also includes diode VD8, diode VD8 one end and the one of piezo-resistance RT
End connection, the other end are connected with tripping coil KA one end.
As shown in figure 5, the control circuit includes controllable silicon VT1 and controllable silicon VT2, controllable silicon VT1 and controllable silicon VT2 string
Connection connection, one end after series connection are connected with trip circuit, and the other end is connected with power circuit, controllable silicon VT1 G poles and controllable silicon
VT2 G poles are connected with electric-leakage detection circuit respectively, are led simultaneously to controllable silicon VT1 and controllable silicon VT2 outputs by control chip IC
Messenger could turn on；Electric-leakage detection circuit directly monitors the residual current of main circuit by ZCT TA, when electric leakage is examined
For slowdown monitoring circuit when detecting residual current, control trip circuit performs the trip action of breaker；The control circuit also includes
Diode VD7 and resistance R4, diode VD7 positive pole are connected with electric-leakage detection circuit, and diode VD7 negative pole is with resistance R4's
One end is connected, and the resistance R4 other end is connected with controllable silicon VT1 G poles, and controllable silicon VT1 positive pole is connected with trip circuit, can
Control silicon VT1 negative pole is connected with controllable silicon VT2 positive pole, and controllable silicon VT2 negative pole is connected with power circuit, controllable silicon VT2 G
Pole is connected with electric-leakage detection circuit.The utility model residual current action breaker circuit, accessed by being connected in control circuit
Two controllable silicon VT1 and controllable silicon VT2, controllable silicon VT1 G poles and controllable silicon VT2 G poles are connected with control chip IC respectively,
Need control chip IC to need while trigger controllable silicon VT2 and controllable silicon VT1 conductings, control circuit could be sent to trip circuit
Trip signal performs the trip action of breaker, and the precision of residual current action breaker circuit is high, and security performance is high, stability
Can be high.
As shown in figure 5, the electric-leakage detection circuit includes resistance R1, bilateral diode D1, resistance R2, resistance R3, electric capacity
C1, electric capacity C2, electric capacity C3, electric capacity C5, electric capacity C4 and control chip IC；The power supply L1 phases, power supply L2 phases, power supply L3 phase conductors
Through ZCT TA, resistance R2 and resistance R3 are connected in series in both ends and the control of ZCT TA secondary coil respectively
Between the first pin and the second pin of chip IC processed, bilateral diode D1 and debugging resistance R1 are connected in resistance R2 and electricity in parallel
R3 is hindered close to ZCT TA side, electric capacity C1 is connected in resistance R2 and resistance R3 opposite side in parallel, and the one of electric capacity C2
End is connected with control chip IC the 4th pin and the 5th pin respectively, the electric capacity C2 other end and control chip IC the 3rd pipe
Pin is connected, and electric capacity C3 both ends are connected in parallel between control chip IC three-prong and the 6th pin respectively, electric capacity C4's
Both ends are connected in parallel between control chip IC three-prong and the 7th pin respectively, and electric capacity C5 both ends are connected in parallel respectively
Between control chip IC three-prong and the 8th pin；Control chip IC the 7th pin and the 8th pin and control circuit
Connection, control chip IC the 8th pin are connected with power circuit.Electric-leakage detection circuit detects to residual current, works as presence
During residual current, control chip IC exports high level and turned on to controllable silicon VT2 G poles, and then connects dropout loop and carry out
Trip operation.
As shown in figure 5, the power circuit also includes surge absorbing circuit and reduction voltage circuit；Surge absorbing circuit point
Do not connected with power supply L1 phases, power supply L2 phases with power supply L3, surge absoption protection is carried out to each phase voltage；Surge absorbing circuit it is defeated
Go out end to be connected with the input of rectification circuit, the output end of rectification circuit and the input of reduction voltage circuit connect, after rectification
Voltage is depressured, and the output end of reduction voltage circuit is connected with electric-leakage detection circuit, is supplied to detection of electrical leakage electric voltage after decompression
Road.Surge absorbing circuit carries out surge absoption protection to whole circuit.
As shown in figure 5, the surge absorbing circuit includes piezo-resistance RV1, piezo-resistance RV2, piezo-resistance RV3 and pressure
Quick resistance RV4, piezo-resistance RV3 are connected in parallel between power supply L3 phases and power supply L1 phases, and piezo-resistance RV2 is connected in electricity in parallel
Between source L2 phases and power supply L3 phases, piezo-resistance RV1 is connected in parallel between power supply L1 phases and power supply L2 phases, piezo-resistance RV4
The both ends of rectification circuit and trip circuit are connected in parallel, to passing through piezo-resistance RV1, piezo-resistance RV2, piezo-resistance RV3
The residual voltage absorbed carries out double absorption；The rectification circuit is full-wave rectification, including diode VD1, diode VD2,
Diode VD3, diode VD4, diode VD5 and diode VD6；Diode VD1 and diode VD2, diode VD3 and two poles
Pipe VD4, diode VD5 and diode VD6 are connected in parallel after being connected in series respectively, one end and trip circuit after parallel connection
Connection, diode VD1 and diode VD2 intermediate node are connected with power supply L1, diode VD3 and diode VD4 centre
Node is connected with power supply L2, and diode VD5 and diode VD6 intermediate node are connected with power supply L3；The reduction voltage circuit
Including resistance R5 and resistance R6；One end of one end and rectification circuit after resistance R5 and resistance R6 series connection connects, the other end and leakage
Power detection circuit connects；Pulsating dc voltage is after dropping resistor R5, R6 decompression, there is provided enters to the pins of control chip IC the 8th
The internal voltage stabilizing of row.
As shown in figure 5, also including test loop, the test loop includes test switch S1 and resistance R7, test switch
Both ends after S1 and resistance R7 series connection are connected in parallel between power supply L1 phases and power supply L3 phases.The loop passes through ZCT
TA。
Above content is to combine specific preferred embodiment further detailed description of the utility model, it is impossible to
Assert that specific implementation of the present utility model is confined to these explanations.For the ordinary skill of the utility model art
For personnel, without departing from the concept of the premise utility, some simple deduction or replace can also be made, should all be regarded
To belong to the scope of protection of the utility model.
Claims (10)
1. a kind of earth leakage protective device, including power circuit, electric-leakage detection circuit, trip circuit and control circuit, its feature exists
In：The input of the power circuit is connected to power taking, the output end and control circuit of power circuit with external power supply respectively
Connection, working power is provided for it；
Also include ZCT TA, the both ends of the input of electric-leakage detection circuit and ZCT TA secondary circuit lead
Connection, the output end of electric-leakage detection circuit and the input of control circuit are connected, and the signal collected is fed back into control circuit,
The output end of control circuit is connected with trip circuit, and trip signal is provided for it；
Also include temperature-sensitive device, the temperature-sensitive device is connected in series in trip circuit or the front end of power circuit is used in failure
Protection circuit under state.
2. earth leakage protective device according to claim 1, it is characterised in that：The trip circuit includes tripping coil KA,
Power circuit includes rectification circuit, and temperature-sensitive device is thermistor；The input of rectification circuit is connected with power supply L phases and power supply N
Connect, the output end of rectification circuit is connected with control circuit, and trip circuit is connected between external power supply and rectification circuit, trip line
Circle KA one end is connected with power supply L, the input connection of the other end and rectification circuit；Thermistor is connected in series in whole
Between current circuit and control circuit.
3. earth leakage protective device according to claim 1, it is characterised in that：The trip circuit includes tripping coil KA,
Power circuit includes rectification circuit, and temperature-sensitive device is thermistor；The input of rectification circuit is connected with power supply L phases and power supply N
Connect, the output end of rectification circuit is connected with control circuit, and trip circuit is connected between external power supply and rectification circuit, trip line
Circle KA and thermistor be connected in series, one end of thermistor is connected with power supply L after series connection, tripping coil KA one end with it is whole
The input connection of current circuit.
4. earth leakage protective device according to claim 1, it is characterised in that：The trip circuit includes tripping coil KA,
Power circuit includes rectification circuit, and temperature-sensitive device is thermistor；The input of rectification circuit and power supply L1 phases, power supply L2 phases and
Power supply L3 is connected, and tripping coil KA is connected between rectification circuit and control circuit, the output end of rectification circuit and electricity of threading off
Road connects with control circuit；Thermistor is in series between every phase power input and the input of rectification circuit.
5. earth leakage protective device according to claim 1, it is characterised in that：The trip circuit includes tripping coil KA,
Power circuit includes rectification circuit, and temperature-sensitive device is thermistor；The input of rectification circuit and power supply L1 phases, power supply L2 phases and
Power supply L3 is connected, and tripping coil KA and thermistor are connected in series between rectification circuit and control circuit, rectification circuit
Output end is connected with trip circuit and control circuit.
6. earth leakage protective device according to claim 5, it is characterised in that：The trip circuit also includes diode VD8,
Diode VD8 one end is connected with piezo-resistance RT one end, and the other end is connected with tripping coil KA one end.
7. earth leakage protective device according to claim 5, it is characterised in that：The control circuit include controllable silicon VT1 and
Controllable silicon VT2, controllable silicon VT1 and controllable silicon VT2 are connected in series, and one end after series connection is connected with trip circuit, the other end and electricity
Source circuit is connected, and controllable silicon VT1 G poles and controllable silicon VT2 G poles are connected with electric-leakage detection circuit respectively, pass through control chip
IC could turn on to controllable silicon VT1 and controllable silicon VT2 output Continuity signals simultaneously；Electric-leakage detection circuit passes through ZCT TA
The residual current of main circuit is directly monitored, when electric-leakage detection circuit is detecting residual current, control trip circuit performs disconnected
The trip action of road device；The control circuit also includes diode VD7 and resistance R4, diode VD7 positive pole and detection of electrical leakage
Circuit is connected, and diode VD7 negative pole is connected with resistance R4 one end, and the resistance R4 other end connects with controllable silicon VT1 G poles
Connect, controllable silicon VT1 positive pole is connected with trip circuit, and controllable silicon VT1 negative pole is connected with controllable silicon VT2 positive pole, controllable silicon
VT2 negative pole is connected with power circuit, and controllable silicon VT2 G poles are connected with electric-leakage detection circuit.
8. earth leakage protective device according to claim 5, it is characterised in that：The electric-leakage detection circuit includes resistance R1,
Bilateral diode D1, resistance R2, resistance R3, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C5, electric capacity C4 and control chip IC；Institute
Power supply L1 phases, power supply L2 phases are stated, power supply L3 phase conductors pass through ZCT TA, resistance R2 and resistance R3 to be connected in series in respectively
Between the both ends of ZCT TA secondary coil and control chip IC the first pin and the second pin, bilateral diode D1
Resistance R2 and resistance R3 are connected in parallel with debugging resistance R1 is connected in electricity in parallel close to ZCT TA side, electric capacity C1
R2 and resistance R3 opposite side is hindered, electric capacity C2 one end is connected with control chip IC the 4th pin and the 5th pin respectively, electricity
The other end for holding C2 is connected with control chip IC three-prong, and electric capacity C3 both ends are connected in control chip IC's in parallel respectively
Between three-prong and the 6th pin, electric capacity C4 both ends are connected in control chip IC three-prong and the 7th pipe in parallel respectively
Between pin, electric capacity C5 both ends are connected in parallel between control chip IC three-prong and the 8th pin respectively；Control chip
IC the 7th pin and the 8th pin are connected with control circuit, and control chip IC the 8th pin is connected with power circuit.
9. earth leakage protective device according to claim 5, it is characterised in that：The power circuit also includes surge suction
Receive circuit and reduction voltage circuit；Surge absorbing circuit connects with power supply L1 phases, power supply L2 phases with power supply L3 respectively, and each phase voltage is entered
Row surge absoption is protected；The input of the output end of surge absorbing circuit and rectification circuit connects, the output end of rectification circuit with
The input connection of reduction voltage circuit, the voltage after rectification is depressured, and output end and the electric-leakage detection circuit of reduction voltage circuit connect
Connect, voltage after decompression is supplied to electric-leakage detection circuit.
10. earth leakage protective device according to claim 9, it is characterised in that：The surge absorbing circuit includes pressure-sensitive electricity
RV1, piezo-resistance RV2, piezo-resistance RV3 and piezo-resistance RV4 are hindered, piezo-resistance RV3 is connected in power supply L3 phases and electricity in parallel
Between the L1 phases of source, piezo-resistance RV2 is connected in parallel between power supply L2 phases and power supply L3 phases, and piezo-resistance RV1 is connected in parallel
Between power supply L1 phases and power supply L2 phases, piezo-resistance RV4 is connected in the both ends of rectification circuit and trip circuit in parallel, to through overvoltage
Quick resistance RV1, piezo-resistance RV2, the residual voltage that piezo-resistance RV3 absorbed carry out double absorption；The rectification circuit is
Full-wave rectification, including diode VD1, diode VD2, diode VD3, diode VD4, diode VD5 and diode VD6；Two
Pole pipe VD1 and diode VD2, diode VD3 and diode VD4, diode VD5 and diode VD6 be connected in series respectively after simultaneously
Connection is linked together, and one end after parallel connection is connected with trip circuit, diode VD1 and diode VD2 intermediate node and power supply
L1 is connected, and diode VD3 and diode VD4 intermediate node are connected with power supply L2, diode VD5 and diode VD6's
Intermediate node is connected with power supply L3；The reduction voltage circuit includes resistance R5 and resistance R6；After resistance R5 and resistance R6 series connection
One end and one end of rectification circuit are connected, and the other end is connected with electric-leakage detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720523939.5U CN206878443U (en) | 2017-05-11 | 2017-05-11 | Earth leakage protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720523939.5U CN206878443U (en) | 2017-05-11 | 2017-05-11 | Earth leakage protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206878443U true CN206878443U (en) | 2018-01-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201720523939.5U Active CN206878443U (en) | 2017-05-11 | 2017-05-11 | Earth leakage protective device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108418181A (en) * | 2018-05-18 | 2018-08-17 | 谭乔文 | A kind of time lagged type surge protector back-up protection device of no afterflow non-blind area error-free motion |
| CN110007175A (en) * | 2019-04-17 | 2019-07-12 | 北京电子工程总体研究所 | A kind of test device |
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2017
- 2017-05-11 CN CN201720523939.5U patent/CN206878443U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108418181A (en) * | 2018-05-18 | 2018-08-17 | 谭乔文 | A kind of time lagged type surge protector back-up protection device of no afterflow non-blind area error-free motion |
| CN110007175A (en) * | 2019-04-17 | 2019-07-12 | 北京电子工程总体研究所 | A kind of test device |
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