CN209709668U

CN209709668U - A kind of earth leakage protective device having ground wire missing protection

Info

Publication number: CN209709668U
Application number: CN201920210397.5U
Authority: CN
Inventors: 钱加灿
Original assignee: Yuyao Jiarong Electronic Appliance Co Ltd
Current assignee: Yuyao Jiarong Electronic Appliance Co Ltd
Priority date: 2019-02-19
Filing date: 2019-02-19
Publication date: 2019-11-29
Anticipated expiration: 2029-02-19

Abstract

The utility model discloses a kind of earth leakage protective devices for having ground wire missing protection, are related to earth leakage protective device field, including chip is protected in tripping module, zero sequence transformer, ground wire detection module and leakage；Tripping module is for disconnecting power supply；Zero sequence transformer is used to detect zero curve and whether firewire leaks electricity；Chip and zero sequence transformer communication connection are protected in leakage；When zero sequence transformer detects zero curve and firewire leaks electricity, leakage protects chip controls tripping module and disconnects power supply；For detecting whether ground wire opens a way, ground wire detection module is connect ground wire detection module with tripping module communication；When ground wire detection module detects ground wire open circuit, tripping module disconnects power supply；Compared with prior art, ground wire is detected by ground wire detection module and whether lacks perhaps ground connection not yet in effect and in ground wire missing or in the case where ground connection not yet in effect, actively disconnects power supply, the risk for having prevented mutual inductor caused by ground wire missing and control chip failure, improves safety in utilization.

Description

A kind of earth leakage protective device having ground wire missing protection

Technical field

The utility model relates to earth leakage protective device field more particularly to a kind of earth leakage protectives for having ground wire missing protection Device.

Background technique

With the improvement of living standards, the popularity rate of pot-type boiler is also higher and higher, because of installation or electric wire aging, So that ground wire missing or failure, the user's awareness of safety also having is not high, follows the line of least resistance, by the grounding insert-pin on water heater plug It cuts, so that water heater plug is inserted into the socket without ground wire jack；

When ground wire missing, the control chip of earth leakage protective device, the mutual inductor for detecting electric leakage has the risk of failure；

And in the case where ground wire missing, when zero firewire leaks electricity, it may appear that the case where passive type is protected, i.e. human body Earth leakage protective device just disconnects power supply after touched electrode is grown in short-term, although user is hardly dead because of current extremely short electric shock, Because the paralysis of electric shock, may fall down or pacemaker is made to fail, still there is security risk；

Have the earth leakage protective device of earth wire charged protecting, including each band as disclosed in Chinese invention CN103178492A The phase line L of switch, zero curve N, tri- pole ground wire E, across phase line L, the zero sequence current mutual inductor of zero curve N, hookup, buckle releaser, It is rectification circuit, power voltage step down, silicon-controlled, also set up a current detector and double input end amplifier, current detector just Grade coil one end is connect with ground wire E, with zero after the big resistance value current limliting reduction voltage circuit of the primary coil other end of current detector concatenation Line N connection, the secondary coil of current detector are connect with an input terminal of double input end amplifier, double input end amplifier Two output ends are connect with two silicon-controlled trigger electrodes respectively, the output end access double input end amplification of zero sequence current mutual inductor Another input terminal of device；Although the invention can detect simultaneously whether zero curve, firewire and ground wire leak electricity, which lacks ground wire Lose not any early warning and reply method.

Utility model content

One, technical problems to be solved

For drawbacks described above present in the prior art, safety in utilization of the earth leakage protective device when ground wire lacks is improved.

Two, technical solution

To solve the above problems, providing a kind of earth leakage protective device for having ground wire missing protection, earth leakage protective device includes Chip is protected in tripping module, zero sequence transformer, ground wire detection module and leakage；

Tripping module is for disconnecting power supply；

Zero sequence transformer is used to detect zero curve and whether firewire leaks electricity；

Chip and zero sequence transformer communication connection are protected in leakage；When zero sequence transformer detects zero curve and firewire leaks electricity, leakage is protected Chip controls tripping module disconnects power supply；

For detecting whether ground wire opens a way, ground wire detection module is connect ground wire detection module with tripping module communication；

When ground wire detection module detects ground wire open circuit, tripping module disconnects power supply.

Wherein, tripping module is also used to disconnect ground wire.

Wherein, earth leakage protective device further includes ground wire mutual inductor；

Ground wire mutual inductor is for detecting whether ground wire leaks electricity；

When ground wire mutual inductor detects ground wire electric leakage, leakage protects chip controls tripping module and disconnects power supply.

Wherein, ground wire detection module includes first capacitor, the second capacitor and optocoupler, one end of first capacitor respectively with optocoupler The first input pin and the second capacitor one end electrical connection, the other end of first capacitor is electrically connected with firewire, the second capacitor it is another One end is electrically connected with zero curve, the second input pin of optocoupler be electrically connected to ground；When ground wire open circuit, optocoupler cut-off.

Wherein, tripping module includes tripping coil, switch and active switching element, and leakage protects chip and passes through active switching element Whether control tripping coil is powered, and switch disconnects power supply when tripping coil is powered.

Wherein, active switching element is silicon-controlled.

Wherein, the first capacitor and second capacitor are safety capacitor.

Three, the beneficial effects of the utility model

Compared with prior art, whether the utility model detects ground wire by ground wire detection module and lacks or not yet in effect connect Ground, and in the case where ground wire missing or ground connection not yet in effect, power supply is actively disconnected, mutual inductance caused by ground wire missing has been prevented The risk of device and control chip failure has also prevented common earth leakage protective device passive type and has protected be may cause risk, improved Safety in utilization.

Detailed description of the invention

Fig. 1 is the module map of the embodiments of the present invention 1；

Fig. 2 is the schematic diagram of the embodiments of the present invention 1；

Fig. 3 is the schematic diagram of the embodiments of the present invention 2；

Fig. 4 is the module map of the embodiments of the present invention 3.

Specific embodiment

With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below Embodiment cannot be used to limit the scope of the utility model for illustrating the utility model.

Embodiment 1:

As shown in Figure 1, earth leakage protective device includes that chip is protected in tripping module, zero sequence transformer, ground wire detection module and leakage；

Tripping module is for disconnecting power supply；

As shown in Fig. 2, when zero sequence transformer ZCT1 detects that zero curve N or firewire L leak electricity, zero sequence transformer ZCT1 to Leakage protects chip U1 and issues an electric leakage signal, and after leakage guarantor chip U1 receives the signal, the port 7 that chip U1 is protected in leakage exports high electricity It is flat, be connected through diode D2 driving controllable silicon SCR 1 so that tripping coil L1 is powered so that switch S1 disconnect zero point N with Firewire L.

It is attempted by between zero curve N and firewire L after safety capacitor C2 and safety capacitor C3 series connection, 1 foot of optocoupler U2 is connected to Between safety capacitor C2 and safety capacitor C3,2 feet of optocoupler U2 are connect through resistance R12 with ground wire E, and 4 feet of optocoupler U2 are through resistance The base stage of the Q1 of R8 and triode connects, and the collector of triode Q1 is through the base stage of resistance R10 connecting triode Q2, triode Q2 Collector connect respectively with resistance R6 and diode D3, wherein diode D3 is also electrically connected with the triggering foot of controllable silicon SCR 1；

In ground wire E effective grounding:

When switch S1 closure powers on, optocoupler U2 conducting, 3 feet of optocoupler U2 and 4 foot internal resistances are reduced, so that triode Q1 conducting, triode Q1 causes triode Q2 to be also switched on, therefore controllable silicon SCR 1 does not turn on, and circuit being capable of normal work Make；

In the case where ground wire E ground connection not yet in effect or ground wire E lack:

When switch S1 closure powers on, because of ground wire E missing or ground connection not yet in effect, optocoupler U2 cut-off, into And causing triode Q1 and triode Q2 to end, therefore controllable silicon SCR 1 is connected, tripping coil L1 is powered, so that switch S1 Disconnect zero point N and firewire L.

By ground wire detection module detect ground wire whether lack perhaps ground connection not yet in effect and ground wire missing or it is not yet in effect In the case where ground connection, power supply is actively disconnected, has prevented the risk of mutual inductor caused by ground wire missing and control chip failure, also Prevent common earth leakage protective device passive type and protected be may cause risk, improves safety in utilization.

Embodiment 2:

As shown in figure 3, the switch S1 of the present embodiment also will disconnect ground wire E when disconnecting zero curve N and firewire L.

Embodiment 3:

As shown in figure 4, the present embodiment further includes ground wire mutual inductor, chip and ground wire mutual inductor communication connection are protected in leakage；It is local When line mutual inductor detects ground wire electric leakage, leakage protects chip controls tripping module and disconnects power supply.

Embodiment of above is merely to illustrate the utility model, and is not limitation of the utility model, related technology neck The those of ordinary skill in domain, in the case where not departing from the spirit and scope of the utility model, can also make a variety of changes and Modification, therefore all equivalent technical solutions also belong to the scope of the utility model, the scope of patent protection of the utility model is answered It is defined by the claims.

Claims

1. it is a kind of have ground wire missing protection earth leakage protective device, which is characterized in that the earth leakage protective device include tripping module, Chip is protected in zero sequence transformer, ground wire detection module and leakage；

The tripping module is for disconnecting power supply；

The zero sequence transformer is used to detect zero curve and whether firewire leaks electricity；

Chip and the zero sequence transformer communication connection are protected in the leakage；When the zero sequence transformer detects zero curve and firewire electric leakage When, the leakage protects tripping module described in chip controls and disconnects power supply；

For detecting whether ground wire opens a way, the ground wire detection module and the tripping module communication connect the ground wire detection module It connects；

When the ground wire detection module detects ground wire open circuit, the tripping module disconnects power supply.

2. a kind of earth leakage protective device for having ground wire missing protection as described in claim 1, which is characterized in that the tripping mould Block is also used to disconnect ground wire.

3. a kind of earth leakage protective device for having ground wire missing protection as described in claim 1, which is characterized in that the electric leakage is protected Protecting device further includes ground wire mutual inductor；

The ground wire mutual inductor is for detecting whether ground wire leaks electricity；

When the ground wire mutual inductor detects ground wire electric leakage, the leakage protects tripping module described in chip controls and disconnects power supply.

4. a kind of earth leakage protective device for having ground wire missing protection as described in claim 1, which is characterized in that the ground wire inspection Surveying module includes first capacitor, the second capacitor and optocoupler, and one end of the first capacitor is inputted with the first of the optocoupler respectively The electrical connection of one end of foot and the second capacitor, the other end of the first capacitor is electrically connected with firewire, second capacitor it is another End be electrically connected with zero curve, the second input pin of the optocoupler be electrically connected to ground；When the ground wire open circuit, the optocoupler is cut Only.

5. a kind of earth leakage protective device for having ground wire missing protection as described in claim 1, which is characterized in that the tripping mould Block includes tripping coil, switch and active switching element, and the leakage protects chip and controls described take off by the active switching element Whether fastening wire circle is powered, and the switch disconnects power supply when the tripping coil is powered.

6. a kind of earth leakage protective device for having ground wire missing protection as claimed in claim 5, which is characterized in that described active to open It is silicon-controlled for closing element.

7. a kind of earth leakage protective device for having ground wire missing protection as claimed in claim 4, which is characterized in that first electricity Hold and second capacitor is safety capacitor.