CN206180565U - Leakage protection circuit and charger - Google Patents
Leakage protection circuit and charger Download PDFInfo
- Publication number
- CN206180565U CN206180565U CN201620920991.XU CN201620920991U CN206180565U CN 206180565 U CN206180565 U CN 206180565U CN 201620920991 U CN201620920991 U CN 201620920991U CN 206180565 U CN206180565 U CN 206180565U
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- China
- Prior art keywords
- earth leakage
- leakage protective
- electric capacity
- connects
- protective chip
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- Expired - Fee Related
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- Emergency Protection Circuit Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model belongs to the technical field of the protection circuit, especially, relate to a leakage protection circuit and charger. The embodiment of the utility model provides an in, leakage protection circuit includes earth leakage protection detecting element and power on -off control unit, the earth leakage protection detecting element detection receives the protection circuit electric phenomena whether to appear leaking, if appear leaking electric phenomena, power on -off control unit control is broken off by the earth leakage protection 0 of protection circuit, can avoid human circuit because of contacting the electric leakage like this, and produce the phenomenon of electrocuteeing.
Description
Technical field
This utility model belongs to protection circuit technical field, more particularly to a kind of leakage protection circuit and charger.
Background technology
The charger major part of current mobile phone, flat board and data product uses Switching Power Supply.According to simultaneous to electromagnetism in GB
Hold the requirement of (EMC, EMI) and safety.The design of the to the effect that noise filter of EMI design.Filtered using Switching Power Supply
Device can effectively suppress the noise access arrangement (power supply) in electrical network, it is also possible to suppress the sound pollution electricity that equipment (power supply) is produced
Net.Noise has two kinds, and one kind is common-mode noise, and one kind is differential mode noise.Common-mode noise be flow into the earth electric current, differential mode noise
It is the electric current between line and line.In order to suppress these sound pollutions just to adopt filter circuit, in order to suppress work common mode disturbances
Two lines L in input are accomplished by, N lines are respectively and upper two electric capacity is to ground.Such as charger has extra grounding pin, then this portion
Divide interference signal to flow into the earth, reach the effect of filtering.Such as unearthed, people flows into human body if contact.Namely we are managed
The leaky of solution.(this portion voltage is exchange, generally up to 110V or so).Existing charger much uses Two-feet plug,
Namely there was only L (live wire) and N (zero line), not extra grounding pin, if in charging process, human contact is to filling
The outfan of electrical equipment, it is likely that electric shock can be caused.
Utility model content
The purpose of this utility model embodiment is to provide a kind of leakage protection circuit, it is intended to solve existing power device
There is leaky, be easily caused the problem of human electric shock.
This utility model embodiment is achieved in that a kind of leakage protection circuit, and the leakage protection circuit includes：
Whether detection protected circuit there is the earth leakage protective detector unit of leaky；And
It is connected with the earth leakage protective detector unit, if there is leaky, controls the power supply electricity of the protected circuit
The on/off control unit that road disconnects.
The another object of this utility model embodiment is to provide a kind of charger, including leakage protection circuit, the leakage
Electric protection circuit includes：
Whether detection charger there is the earth leakage protective detector unit of leaky；And
It is connected with the earth leakage protective detector unit, if there is leaky, the power circuit for controlling the charger breaks
The on/off control unit opened.
In this utility model embodiment, leakage protection circuit includes that earth leakage protective detector unit and on/off control are single
Whether unit, earth leakage protective detector unit detection protected circuit there is leaky, if there is leaky, on/off control
The power circuit of unit control protected circuit disconnects, and can so avoid human body because of the circuit of contact electric leakage, and produces electric shock
Phenomenon.
Description of the drawings
Fig. 1 is the function structure chart of the leakage protection circuit that this utility model embodiment is provided；
Fig. 2 is the structure chart of the leakage protection circuit that this utility model embodiment is provided.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to this utility model.It should be appreciated that specific embodiment described herein is only to explain
This utility model, is not used to limit this utility model.
Fig. 1 shows the modular structure of the leakage protection circuit that this utility model embodiment is provided, for convenience of description, only
Show the part related to this utility model embodiment.
A kind of leakage protection circuit, the leakage protection circuit includes：
Whether detection protected circuit there is the earth leakage protective detector unit 1 of leaky；And
It is connected with the earth leakage protective detector unit 1, if there is leaky, controls the power supply electricity of the protected circuit
The on/off control unit 2 that road disconnects.
Fig. 2 shows the structure of the leakage protection circuit that this utility model embodiment is provided, and for convenience of description, only illustrates
The part related to this utility model embodiment.
Used as the embodiment of this utility model one, the earth leakage protective detector unit 1 includes zero current transformer Z1, described zero
The iron core of current transformer Z1 is enclosed within the power circuit of the protected circuit, the Secondary Winding of the zero current transformer Z1
Connect the on/off control unit 2.
Used as the embodiment of this utility model one, the on/off control unit 2 includes：
Relay K1, rectifier bridge U1, earth leakage protective chip U2, IGCT SCR, resistance R1, resistance R4, resistance R5, electric capacity
C1, electric capacity C2, electric capacity C3, electric capacity C4 and electric capacity C5；
The switch of the relay K1 is connected on the power circuit of the protected circuit, and the one of the rectifier bridge U1 is defeated
Enter the power circuit that end connects the protected circuit by the coil of the relay K1, another input of the rectifier bridge U1
The power circuit of the protected circuit is directly connect, first outfan of the rectifier bridge U1 connects the leakage by the resistance R1
Ground terminal GND of the second output termination earth leakage protective chip U2 of the power end Vs of electric protection chip U2, the rectifier bridge U1,
The electric capacity C1 is connected between the power end Vs of the earth leakage protective chip U2 and ground terminal GND, the earth leakage protective chip U2
Reference voltage end VR connect the zero current transformer Z1 Secondary Winding first end, the detection of the earth leakage protective chip U2
Signal input part Input connects the second end of the Secondary Winding of the zero current transformer Z1, the resistance by the resistance R5
R4 is connected between the first end of the Secondary Winding of the zero current transformer Z1 and the second end, and the electric capacity C3 is connected to described
Between the first end and ground terminal GND of the Secondary Winding of zero current transformer Z1, the amplifier output of the earth leakage protective chip U2
Respectively by the electric capacity C4 earth terminal GND, the noise of the earth leakage protective chip U2 presses down end OD and latch circuit input SC
End NR processed connects the control end of the IGCT SCR, trigger output end OS of the earth leakage protective chip U2 by the electric capacity C2
The control end of the IGCT SCR is connect, the anode of the IGCT SCR connects first outfan of the rectifier bridge U1, the crystalline substance
The anode of brake tube SCR connects first outfan of the rectifier bridge U1, and the negative electrode of the IGCT SCR connects the earth leakage protective chip
Ground terminal GND of U2, the electric capacity C5 be connected to the control end of the IGCT SCR and earth leakage protective chip U2 ground terminal GND it
Between.
Used as the embodiment of this utility model one, the earth leakage protective chip U2 adopts UTC54123 model chips, certainly
Other model chips can be adopted, is no longer repeated one by one here.
Used as the embodiment of this utility model one, the leakage protection circuit also includes being connected on the sun of the IGCT SCR
Resistance R2 and electric capacity C6 between pole and negative electrode.Resistance R2 and electric capacity C6 is used to absorb self-induction when relay K1 disconnects on coil
Electromotive force.
Used as the embodiment of this utility model one, the relay K1 disconnects relay for normally closed, energization.
This utility model embodiment also provides a kind of charger, including leakage protection circuit, the leakage protection circuit bag
Include：
Whether detection charger there is the earth leakage protective detector unit 1 of leaky；And
It is connected with the earth leakage protective detector unit 1, if there is leaky, the power circuit for controlling the charger breaks
The on/off control unit 2 opened.
Used as the embodiment of this utility model one, the earth leakage protective detector unit 1 includes zero current transformer Z1, described zero
The iron core of current transformer Z1 is enclosed within the power circuit of the charger, and the Secondary Winding of the zero current transformer Z1 meets institute
State on/off control unit 2.
Used as the embodiment of this utility model one, the on/off control unit 2 includes：
Relay K1, rectifier bridge U1, earth leakage protective chip U2, IGCT SCR, resistance R1, resistance R4, resistance R5, electric capacity
C1, electric capacity C2, electric capacity C3, electric capacity C4 and electric capacity C5；
The switch of the relay K1 is connected on the power circuit of the charger, an input of the rectifier bridge U1
The power circuit of the charger is connect by the coil of the relay K1, another input of the rectifier bridge U1 directly meets institute
The power circuit of charger is stated, first outfan of the rectifier bridge U1 meets the earth leakage protective chip U2 by the resistance R1
Power end Vs, ground terminal GND of the second output termination earth leakage protective chip U2 of the rectifier bridge U1, the electric capacity C1 connects
It is connected between the power end Vs of the earth leakage protective chip U2 and ground terminal GND, the reference voltage end of the earth leakage protective chip U2
VR connects the first end of the Secondary Winding of the zero current transformer Z1, the detection signal input of the earth leakage protective chip U2
Input connects the second end of the Secondary Winding of the zero current transformer Z1 by the resistance R5, and the resistance R4 is connected to institute
State between first end and second end of the Secondary Winding of zero current transformer Z1, the electric capacity C3 is connected to the zero current mutual inductance
Between the first end and ground terminal GND of the Secondary Winding of device Z1, the amplifier out OD and breech lock of the earth leakage protective chip U2
Respectively by the electric capacity C4 earth terminal GND, the noise suppressed end NR of the earth leakage protective chip U2 passes through circuit input end SC
The electric capacity C2 connects the control end of the IGCT SCR, and trigger output end OS of the earth leakage protective chip U2 connects the brilliant lock
The control end of pipe SCR, the anode of the IGCT SCR connects first outfan of the rectifier bridge U1, the sun of the IGCT SCR
Pole connects first outfan of the rectifier bridge U1, and the negative electrode of the IGCT SCR connects the ground terminal of the earth leakage protective chip U2
GND, the electric capacity C5 is connected between ground terminal GND of the control end of the IGCT SCR and earth leakage protective chip U2.
Used as the embodiment of this utility model one, the leakage protection circuit also includes being connected on the sun of the IGCT SCR
Resistance R2 and electric capacity C6 between pole and negative electrode.Resistance R2 and electric capacity C6 is used to absorb self-induction when relay K1 disconnects on coil
Electromotive force.
Used as the embodiment of this utility model one, the relay K1 disconnects relay for normally closed, energization.
The operation principle of the leakage protection circuit is：
When circuit is normal, the coil of 220V alternating voltage Jing relay K1 delivers to rectifier bridge U1, the DC voltage after rectification,
Earth leakage protective chip U2 is sent to Jing after R1 blood pressure lowerings, C1 filtering, is that earth leakage protective chip U2 powers.Due to earth leakage protective chip U2's
Operating current very little (2mA or so), the also very little of the electromagnetic force produced by the coil of relay K1, it is impossible to make the switch of relay K1
Action, therefore, the switch of relay K1 is in closure state.
When leakage current occurs in protected circuit, faradic current is produced in the Secondary Winding of zero current transformer Z1,
The electric current is converted into voltage signal on load resistance R4 and Jing introduces the detection signal that resistance R5 delivers to earth leakage protective chip U2
Input Input.Signal after amplification is exported by latch circuit input SC, is sent into from noise suppressed end NR Jing after C2 filtering and is fastened with a bolt or latch
Lock circuit.When leakage current less (being less than action current), the signal after amplification is also little, the triggering output of earth leakage protective chip U2
End OS output low levels, IGCT SCR is still failure to actuate；When leakage current is relatively larger than action current, the signal after amplification is larger,
The trigger output end OS output high level of earth leakage protective chip U2 simultaneously charges to C2, while SCR is triggered, once SCR conductings, rectification
Bridge U1 outputs are turned on by SCR, and the coil of relay K1 can flow through larger current, and the alternating voltage of 220V is added to into relay K1's
The two ends of coil, the current surge in coil simultaneously produces sufficiently large electromagnetism the suction-combining force and makes switching off for relay K1, completes
Protection act.
In this utility model embodiment, leakage protection circuit includes that earth leakage protective detector unit and on/off control are single
Whether unit, earth leakage protective detector unit detection protected circuit there is leaky, if there is leaky, on/off control
The power circuit of unit control protected circuit disconnects, and can so avoid human body because of the circuit of contact electric leakage, and produces electric shock
Phenomenon.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit this utility model
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in this utility model
Protection domain within.
Claims (8)
1. a kind of leakage protection circuit, it is characterised in that the leakage protection circuit includes：
Whether detection protected circuit there is the earth leakage protective detector unit of leaky；And
It is connected with the earth leakage protective detector unit, if there is leaky, the power circuit for controlling the protected circuit breaks
The on/off control unit opened；
The earth leakage protective detector unit includes zero current transformer Z1, and the iron core of the zero current transformer Z1 is enclosed within described receiving
On the power circuit of protection circuit, the Secondary Winding of the zero current transformer Z1 connects the on/off control unit.
2. leakage protection circuit as claimed in claim 1, it is characterised in that the on/off control unit includes：
Relay K1, rectifier bridge U1, earth leakage protective chip U2, IGCT SCR, resistance R1, resistance R4, resistance R5, electric capacity C1, electricity
Hold C2, electric capacity C3, electric capacity C4 and electric capacity C5；
The switch of the relay K1 is connected on the power circuit of the protected circuit, an input of the rectifier bridge U1
The power circuit of the protected circuit is connect by the coil of the relay K1, another input of the rectifier bridge U1 is direct
The power circuit of the protected circuit is connect, first outfan of the rectifier bridge U1 connects the electric leakage and protects by the resistance R1
Ground terminal GND of the second output termination earth leakage protective chip U2 of the power end Vs of shield chip U2, the rectifier bridge U1, it is described
Electric capacity C1 is connected between the power end Vs of the earth leakage protective chip U2 and ground terminal GND, the ginseng of the earth leakage protective chip U2
Examine the first end that voltage end VR connects the Secondary Winding of the zero current transformer Z1, the detection signal of the earth leakage protective chip U2
Input Input connects the second end of the Secondary Winding of the zero current transformer Z1 by the resistance R5, and the resistance R4 connects
It is connected between the first end of the Secondary Winding of the zero current transformer Z1 and the second end, it is electric that the electric capacity C3 is connected to described zero
Between the first end and ground terminal GND of the Secondary Winding of current transformer Z1, the amplifier out OD of the earth leakage protective chip U2
With latch circuit input SC respectively by the electric capacity C4 earth terminal GND, the noise suppressed end of the earth leakage protective chip U2
NR connects the control end of the IGCT SCR by the electric capacity C2, and trigger output end OS of the earth leakage protective chip U2 meets institute
The control end of IGCT SCR is stated, the anode of the IGCT SCR connects first outfan of the rectifier bridge U1, the IGCT
The anode of SCR connects first outfan of the rectifier bridge U1, and the negative electrode of the IGCT SCR connects the earth leakage protective chip U2's
Ground terminal GND, the electric capacity C5 is connected between ground terminal GND of the control end of the IGCT SCR and earth leakage protective chip U2.
3. leakage protection circuit as claimed in claim 2, it is characterised in that the leakage protection circuit also includes being connected on institute
State the resistance R2 and electric capacity C6 between the anode and negative electrode of IGCT SCR.
4. leakage protection circuit as claimed in claim 3, it is characterised in that the relay K1 for it is normally closed, be powered disconnect after
Electrical equipment.
5. a kind of charger, it is characterised in that including leakage protection circuit, the leakage protection circuit includes：
Whether detection charger there is the earth leakage protective detector unit of leaky；And
It is connected with the earth leakage protective detector unit, if there is leaky, controls the power circuit disconnection of the charger
On/off control unit；
The earth leakage protective detector unit includes zero current transformer Z1, and the iron core of the zero current transformer Z1 is enclosed within described filling
On the power circuit of electrical equipment, the Secondary Winding of the zero current transformer Z1 connects the on/off control unit.
6. charger as claimed in claim 5, it is characterised in that the on/off control unit includes：
Relay K1, rectifier bridge U1, earth leakage protective chip U2, IGCT SCR, resistance R1, resistance R4, resistance R5, electric capacity C1, electricity
Hold C2, electric capacity C3, electric capacity C4 and electric capacity C5；
The switch of the relay K1 is connected on the power circuit of the charger, and an input of the rectifier bridge U1 passes through
The coil of the relay K1 connects the power circuit of the charger, and another input of the rectifier bridge U1 directly connects described filling
The power circuit of electrical equipment, first outfan of the rectifier bridge U1 connects the electricity of the earth leakage protective chip U2 by the resistance R1
Source Vs, ground terminal GND of the second output termination earth leakage protective chip U2 of the rectifier bridge U1, the electric capacity C1 is connected to
Between the power end Vs and ground terminal GND of the earth leakage protective chip U2, reference voltage end VR of the earth leakage protective chip U2 connects
The first end of the Secondary Winding of the zero current transformer Z1, the detection signal input Input of the earth leakage protective chip U2
The second end of the Secondary Winding of the zero current transformer Z1 is connect by the resistance R5, it is electric that the resistance R4 is connected to described zero
Between the first end of the Secondary Winding of current transformer Z1 and the second end, the electric capacity C3 is connected to the zero current transformer Z1
Secondary Winding first end and ground terminal GND between, the amplifier out OD and latch circuit of the earth leakage protective chip U2
, respectively by the electric capacity C4 earth terminal GND, the noise suppressed end NR of the earth leakage protective chip U2 is by described for input SC
Electric capacity C2 connects the control end of the IGCT SCR, and trigger output end OS of the earth leakage protective chip U2 meets the IGCT SCR
Control end, the anode of the IGCT SCR connects first outfan of the rectifier bridge U1, and the anode of the IGCT SCR connects
First outfan of the rectifier bridge U1, the negative electrode of the IGCT SCR meets ground terminal GND of the earth leakage protective chip U2, institute
State electric capacity C5 to be connected between ground terminal GND of the control end of the IGCT SCR and earth leakage protective chip U2.
7. charger as claimed in claim 6, it is characterised in that the leakage protection circuit also includes being connected on the brilliant lock
Resistance R2 and electric capacity C6 between the anode and negative electrode of pipe SCR.
8. charger as claimed in claim 7, it is characterised in that the relay K1 for it is normally closed, being powered disconnects relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620920991.XU CN206180565U (en) | 2016-08-23 | 2016-08-23 | Leakage protection circuit and charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620920991.XU CN206180565U (en) | 2016-08-23 | 2016-08-23 | Leakage protection circuit and charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206180565U true CN206180565U (en) | 2017-05-17 |
Family
ID=60240994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620920991.XU Expired - Fee Related CN206180565U (en) | 2016-08-23 | 2016-08-23 | Leakage protection circuit and charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206180565U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247366A (en) * | 2019-06-18 | 2019-09-17 | 德力西电气有限公司 | The leakage protection circuit of anti-coil burnout |
| CN110718895A (en) * | 2019-10-31 | 2020-01-21 | 谷原光电科技（上海）有限公司 | Non-isolated LED driving power supply leakage protection circuit |
-
2016
- 2016-08-23 CN CN201620920991.XU patent/CN206180565U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247366A (en) * | 2019-06-18 | 2019-09-17 | 德力西电气有限公司 | The leakage protection circuit of anti-coil burnout |
| CN110718895A (en) * | 2019-10-31 | 2020-01-21 | 谷原光电科技（上海）有限公司 | Non-isolated LED driving power supply leakage protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170517 Termination date: 20180823 |