CN206992674U - A kind of ground line current locking-type control circuit of earth leakage - Google Patents
A kind of ground line current locking-type control circuit of earth leakage Download PDFInfo
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- CN206992674U CN206992674U CN201720362727.3U CN201720362727U CN206992674U CN 206992674 U CN206992674 U CN 206992674U CN 201720362727 U CN201720362727 U CN 201720362727U CN 206992674 U CN206992674 U CN 206992674U
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- earth leakage
- leakage protective
- ground wire
- electronic switch
- line current
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Abstract
It the utility model is related to earth leakage protective device field; especially a kind of ground line current locking-type control circuit of earth leakage, including measure loop, electronic switch I, electronic switch II, earth leakage protective chip U2, earth leakage protective chip U3, ground wire electrified detection module, ground wire voltage unlocked state, ground wire electrification indicating lamp module and temperature protection switch.The beneficial effects of the utility model：A kind of ground line current locking-type control circuit of earth leakage solves the problems, such as non-locking formula false tripping, reduces complete machine matching and needs to use supplementary costs caused by installation insulation using the extremely disconnected earth leakage protective device of non-locking formula three；This kind of control circuit is that the size of system automatic detection plug Ei Ni terminal voltages opens and closes ground line current defencive function automatically; solve the problems, such as that earth leakage protective device industry high-volume customer complaint and is incorporated into new field of intelligent control by market caused by power utilization environment, make earth leakage protective device safer more humane.
Description
Technical field
Earth leakage protective device field is the utility model is related to, especially a kind of ground line current locking-type earth leakage protective device control electricity
Road.
Background technology
Existing earth leakage protective device is divided into two extremely disconnected and three pole stopping pregnancy product, is protected wherein two pole stopping pregnancy product are suitable only for zero sequence electric leakage
Shield uses, because market power utilization environment cannot ensure that reliable ground causes two pole stopping pregnancy product potential safety hazard to be when in use present, and
Three pole stopping pregnancy product cause the ground line current of socket and consuming device to form closed loop in terminal reliable ground when there is reliable ground
Current loop, trigger three pole stopping pregnancy product Frequent trips, cause consuming device to be unable to normal use (such as gas heater).To understand
Certainly above mentioned problem, the utility model proposes when there is reliable ground, i.e., when being less than predeterminated voltage between power input Ei-Ni ends
(such as：＜ 50V), the size of ground line current will not participate in protection, solve Frequent trip phenomenon with this.Therefore, asked for above-mentioned
Topic is necessary to propose a kind of ground line current locking-type control circuit of earth leakage.
Utility model content
The purpose of the utility model is to overcome deficiency of the prior art, there is provided a kind of ground line current locking-type electric leakage is protected
Protect device control circuit, can identify the voltage between power input Ei-Ni and the voltage it is converted after can be turned on and off ground wire
The control function of electric current.
In order to solve the above-mentioned technical problem, the utility model is to be achieved through the following technical solutions：
A kind of ground line current locking-type control circuit of earth leakage, including measure loop, electronic switch I, electronic switch
II, earth leakage protective chip U2, earth leakage protective chip U3, ground wire electrified detection module, ground wire voltage unlocked state, ground wire electrification refer to
Show lamp module and temperature protection switch.It is defeated that the electronic switch I and electronic switch II are attempted by earth leakage protective chip detection of electrical leakage
Enter and hold COM, VH1, VH2.The ground wire electrified detection module is for detecting the terminal voltage between power input Ei-Ni.Institute
Stating measure loop string has the 3rd electric capacity C3, second resistance R2, optocoupler U1, protection diode D1, the second anti-interference capacitor C2, first
LED 1 and first resistor R1.The ground wire voltage unlocked state is for analyzing the output of ground wire electrified detection module
Whether voltage meets to solve lock control requirement, when reaching systemic presupposition voltage, ground wire voltage unlocked state control output driving electricity
Sub switch I, electronic switch II are realized and earth leakage protective chip are unlocked.The ground wire voltage unlocked state is connected to ground strip
Between electro-detection module and electronic switch I, electronic switch II.
Preferably, the earth leakage protective chip is one or two.
Preferably, the electronic switch I and electronic switch II are for being turned on and off earth leakage protective chip U2, and electric leakage is protected
Protect chip U3 ground wires leakage current and participate in earth leakage protective switching signal.
Preferably, the earth leakage protective chip U2, earth leakage protective chip U3 are for detecting zero sequence electric leakage or ground wire electric leakage
When driving protection chip.
Preferably, the ground wire electrification indicating lamp module is connected between power input Ei and Ni, is for warning ground
The too high safety instruction effect of line abnormal voltage.First LED 1 is serially connected in optocoupler U1 loops.First hair
Optical diode LED1 both ends and the first resistor R1 for being connected to brightness regulation, change first resistor R1 can adjust indicator lamp and open bright electricity
Pressure.
Preferably, the temperature protection switch is for detecting earth leakage protective device pin temperature, is set when pin temperature exceeds
When putting temperature, temperature switch closure, earth leakage protective device trip protection.Temperature switch is attempted by experiment button both ends.
Preferably, ground wire electrified detection module is provided between power input Ei-Ni, the module can export Ei- with direct ratio
Resistance value corresponding to voltage between Ni, when voltage is higher, output internal resistance is low, otherwise higher.Ground wire electrified detection module exports
The size of resistance value acts on ground wire voltage unlocked state input.When resistance value it is small to a certain extent when, electronic switch will close
Close, ground line current is opened defencive function, otherwise electronic switch is opened, ground line current positive closing defencive function, so as to solve
Three extremely disconnected earth leakage protective devices protection phenomenons by mistake when having a reliable ground.
The beneficial effects of the utility model：A kind of ground line current locking-type control circuit of earth leakage solves non-locking
Formula false tripping problem, reduce complete machine matching and needed to use using the extremely disconnected earth leakage protective device of non-locking formula three caused by installation insulation
Supplementary costs；This kind of control circuit is that the size of system automatic detection plug Ei-Ni terminal voltages opens and closes ground wire automatically
Current protecting function, instead of the function of market manual switching ground wire abnormal voltage type earth leakage protective device, be intelligently switch it is new
Type control mode, solve the problems, such as that earth leakage protective device industry high-volume customer complaint and is incorporated into newly by market caused by power utilization environment
Field of intelligent control, make earth leakage protective device safer more humane.
Design, concrete structure and caused technique effect of the present utility model are made furtherly below with reference to accompanying drawing
It is bright, to be fully understood from the purpose of this utility model, feature and effect.
Brief description of the drawings
Fig. 1 is control method frame principle figure of the present utility model；
Fig. 2 is control method circuit diagram of the present utility model；
Fig. 3 is the control method frame principle figure of second of embodiment of the utility model；
Fig. 4 is the control method circuit diagram of second of embodiment of the utility model；
Fig. 5 is the control method frame principle figure of the third embodiment of the utility model；
Fig. 6 is the control method circuit diagram of the third embodiment of the utility model；
Fig. 7 is the control method frame principle figure of the 4th kind of embodiment of the utility model；
Fig. 8 is the control method circuit diagram of the 4th kind of embodiment of the utility model.
Embodiment
Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing, but the utility model can be by right
It is required that the multitude of different ways for limiting and covering is implemented.
Such as Fig. 1 and with reference to shown in Fig. 2 to Fig. 8, a kind of ground line current locking-type control circuit of earth leakage, including detection
Loop, electronic switch I, electronic switch II, earth leakage protective chip U2, earth leakage protective chip U3, ground wire electrified detection module, ground wire
Voltage unlocked state, ground wire electrification indicating lamp module and temperature protection switch.The electronic switch I and electronic switch II are attempted by
Earth leakage protective chip detection of electrical leakage input COM, VH1, VH2.The ground wire electrified detection module is for detecting power input
Hold the terminal voltage between Ei-Ni.The measure loop string has the 3rd electric capacity C3, second resistance R2, optocoupler U1, protection diode
D1, the second anti-interference capacitor C2, the first LED 1 and first resistor R1.The ground wire voltage unlocked state be for
Whether analysis ground wire electrified detection module output voltage meets to solve lock control requirement, when reaching systemic presupposition voltage, ground wire electricity
Pressure unlocked state control output driving electronic switch I, electronic switch II are realized and earth leakage protective chip are unlocked.The ground wire
Voltage unlocked state is connected between ground wire electrified detection module and electronic switch I, electronic switch II.
Further, the earth leakage protective chip is one or two.
Further, the electronic switch I and electronic switch II are for being turned on and off earth leakage protective chip U2, leaking electricity
Chip U3 ground wires leakage current is protected to participate in earth leakage protective switching signal.
Further, the earth leakage protective chip U2, earth leakage protective chip U3 are for detecting zero sequence electric leakage or ground wire leakage
Driving protection chip when electric.
Further, the ground wire electrification indicating lamp module is connected between power input Ei and Ni, is for warning
The too high safety instruction effect of ground wire abnormal voltage.First LED 1 is serially connected in optocoupler U1 loops.First
The both ends of LED 1 and the first resistor R1 for being connected to brightness regulation, change first resistor R1 can adjust indicator lamp open it is bright
Voltage.
Further, the temperature protection switch is for detecting earth leakage protective device pin temperature, when pin temperature exceeds
When temperature is set, temperature switch closure, earth leakage protective device trip protection.Temperature switch is attempted by experiment button both ends.
Further, ground wire electrified detection module is provided between power input Ei-Ni, the module can be exported with direct ratio
Resistance value corresponding to voltage between Ei-Ni, when voltage is higher, output internal resistance is low, otherwise higher.Ground wire electrified detection module
The size of output resistance acts on ground wire voltage unlocked state input, when resistance value it is small to a certain extent when, electronic switch
It will close, and ground line current is opened defencive function, on the contrary electronic switch is opened, ground line current positive closing defencive function, so as to
Three extremely disconnected earth leakage protective devices protect phenomenon by mistake when having solved reliable ground.
Ground wire electrified detection：When the terminal voltage between Ei-Ni is raised to a certain degree (such as：50V), ground wire voltage Ei is passed through
C3, R2, U1, LED1 and Ni form loop, and now optocoupler U1 is turned on.When the terminal voltage between Ei-Ni is higher, U1 conductings are got over
Deep, output internal resistance is smaller；Otherwise output internal resistance is bigger.After LED1, U1, R2, C3 concatenation and between Ei-Ni.
Ground wire voltage solution lock control：As optocoupler U1 conducting degree is deepened, VCC voltages U1 (internal resistance), are added to Q1 simultaneously through R3
Saturation conduction, Q2 cut-offs, electronic switch Q3, Q4 cut-off.Q3, Q4 cut-off have also been switched on ground line current defencive function, realize
Ground wire voltage is unlocked control to ground line current.When U1, which is turned on, to be reduced, Q1 cut-offs, Q2, Q3, Q4 saturation conductions, force
Ground line current control earth leakage protective chip U2 or earth leakage protective chip U3 input is closed, makes ground line current be not involved in protecting
Control.Electronic switch Q3, Q4 are attempted by U2, on U3 COM, VH1 or VH2 pin.
The automatic locking control of ground line current (such as：＜ 50V between Ei-Ni)：When voltage is low between power input Ei-Ni
When predeterminated voltage (such as：50V), U1 is not enough to conducting therefore output high resistant, Q1 cut-offs, and Q2, Q3 saturation conductions cause U2_VH2
The direct shorted to earth of pin current detecting input signal, also do not cause current protection so as to cause ground wire high current to be present, solve
Ground line current trip protection phenomenon caused by low-voltage in safe range.
The utility model earth leakage protective chip 1 (U2), ground line current detection input pin (COM, VH2), wherein on controlled
Unlocking pin is：VH2.The earth leakage protective chip 2 (U2, U3) of second of embodiment, ground line current detection input pin U3 (COM,
VH1), wherein controlled upper unblock pin is U3_COM.The earth leakage protective chip 2 (U2, U3) of the third embodiment, ground line current
Input pin U3 (COM, VH1) is detected, wherein controlled upper unblock pin is U3_VH1.The earth leakage protective chip of 4th embodiment 2
(U2, U3), ground line current detection input pin U3 (COM, VH1), wherein controlled upper unblock pin is U3_COM, VH1.
A kind of ground line current locking-type control circuit of earth leakage of the utility model solves the problems, such as non-locking formula false tripping,
Reduce complete machine matching and need to use supplementary costs caused by installation insulation using the extremely disconnected earth leakage protective device of non-locking formula three；Should
Kind control circuit is that the size of system automatic detection plug Ei-Ni terminal voltages to open and close ground line current protection work(automatically
Can, the function of market manual switching ground wire abnormal voltage type earth leakage protective device is instead of, is the novel control mode intelligently switched,
Solve the problems, such as that earth leakage protective device industry high-volume customer complaint and is incorporated into new intelligent control by market caused by power utilization environment
Field, make earth leakage protective device safer more humane.
Preferred embodiment of the present utility model described in detail above.It should be appreciated that the ordinary skill people of this area
Member makes many modifications and variations without creative work can according to design of the present utility model.Therefore, all this technology necks
Technical staff passes through logic analysis, reasoning or limited reality on the basis of existing technology according to design of the present utility model in domain
Available technical scheme is tested, all should be in the protection domain being defined in the patent claims.
Claims (4)
- A kind of 1. ground line current locking-type control circuit of earth leakage, it is characterised in that：Including measure loop, electronic switch I, Electronic switch II, earth leakage protective chip U2, earth leakage protective chip U3, ground wire electrified detection module, ground wire voltage unlocked state, Tape electricity indicating lamp module and temperature protection switch, the electronic switch I and electronic switch II are attempted by the leakage of earth leakage protective chip Electro-detection input COM, VH1, VH2, the ground wire electrified detection module are for detecting the end between power input Ei-Ni Voltage, the measure loop string have the 3rd electric capacity C3, second resistance R2, optocoupler U1, protection diode D1, the second anti-interference capacitor C2, the first LED 1 and first resistor R1, the ground wire voltage unlocked state is for analyzing ground wire electrified detection Whether module output voltage meets that solving lock control requires, when reaching systemic presupposition voltage, the control of ground wire voltage unlocked state is defeated Go out to drive electronic switch I, electronic switch II to realize to be unlocked earth leakage protective chip, the ground wire voltage unlocked state connection Between ground wire electrified detection module and electronic switch I, electronic switch II.
- A kind of 2. ground line current locking-type control circuit of earth leakage according to claim 1, it is characterised in that：It is described Earth leakage protective chip is one or two.
- A kind of 3. ground line current locking-type control circuit of earth leakage according to claim 1, it is characterised in that：It is described Electronic switch I and electronic switch II is for being turned on and off earth leakage protective chip U2, earth leakage protective chip U3 ground wire leakage currents Participate in earth leakage protective switching signal.
- A kind of 4. ground line current locking-type control circuit of earth leakage according to claim 1, it is characterised in that：It is described Ground wire electrification indicating lamp module is connected between power input Ei and Ni, and first LED 1 is serially connected in optocoupler In U1 loops, the both ends of the first LED 1 and the first resistor R1 for being connected to brightness regulation, changing first resistor R1 can be with Regulation indicator lamp opens bright voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720362727.3U CN206992674U (en) | 2017-03-30 | 2017-03-30 | A kind of ground line current locking-type control circuit of earth leakage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720362727.3U CN206992674U (en) | 2017-03-30 | 2017-03-30 | A kind of ground line current locking-type control circuit of earth leakage |
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| Publication Number | Publication Date |
|---|---|
| CN206992674U true CN206992674U (en) | 2018-02-09 |
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| CN201720362727.3U Active CN206992674U (en) | 2017-03-30 | 2017-03-30 | A kind of ground line current locking-type control circuit of earth leakage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106981859A (en) * | 2017-03-30 | 2017-07-25 | 乐清市诚富电器科技有限公司 | A kind of ground line current locking-type earth leakage protective device control method |
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2017
- 2017-03-30 CN CN201720362727.3U patent/CN206992674U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106981859A (en) * | 2017-03-30 | 2017-07-25 | 乐清市诚富电器科技有限公司 | A kind of ground line current locking-type earth leakage protective device control method |
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