CN206832916U - One kind input ground line detection circuit - Google Patents
One kind input ground line detection circuit Download PDFInfo
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- CN206832916U CN206832916U CN201720369773.6U CN201720369773U CN206832916U CN 206832916 U CN206832916 U CN 206832916U CN 201720369773 U CN201720369773 U CN 201720369773U CN 206832916 U CN206832916 U CN 206832916U
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Abstract
The utility model discloses one kind to input ground line detection circuit, including input detecting circuit, detection indicating circuit, current rectifying and wave filtering circuit, power switch circuit, high frequency transformer, flow equalizing circuit, output filter circuit, pwm control circuit and feedback circuit, the high frequency transformer includes the first primary coil, the second primary coil and secondary coil.The utility model passes through input detecting circuit and detection indicating circuit, automatically the terminals of input can be carried out detecting whether its live wire, ground wire and zero line connect normally, if there are abnormal conditions, then send corresponding lamplight pointing, user is prompted to check circuit, so as to greatly improve the security that electrical appliance uses.During the utility model can detect extensively using incoming line.
Description
Technical field
It the utility model is related to electronic circuit technology field, more particularly to a kind of input ground line detection circuit.
Background technology
At present, in general consumer has to the consciousness understanding deficiency of good earth to ground wire, and it is necessary often to ignore ground wire
There is the importance of good ground connection, arbitrarily tie up ground wire in tap pipe or the simple iron nail being connected on wall etc., some is even
It is clear-cut earth-free, or connect original ground wire but be invalid ground wire in fact, in this case, in the event of leaking electricity, leakage
Electric current just only forms loop by human body to ground, it is clear that this quite dangerous for user.
Utility model content
In order to solve the above-mentioned technical problem, the purpose of this utility model, which is to provide, a kind of can detect abnormal a kind of defeated of wiring
Enter ground line detection circuit.
Technical solution adopted in the utility model is：
One kind input ground line detection circuit, includes input detecting circuit, detection indicating circuit, current rectifying and wave filtering circuit, work(
Rate on-off circuit, high frequency transformer, flow equalizing circuit, output filter circuit, pwm control circuit and feedback circuit, the high frequency become
Depressor includes the first primary coil, the second primary coil and secondary coil, the first output end connection of the input detecting circuit
To the input of current rectifying and wave filtering circuit, the output end of the current rectifying and wave filtering circuit is respectively connecting to high frequency transformer the first primary side line
The first end of circle and the first input end of pwm control circuit, the secondary coil of the high frequency transformer are connected to flow equalizing circuit
Input, the first output end of the flow equalizing circuit are connected to the first input of feedback circuit by output filter circuit
End, the second output end of the flow equalizing circuit are connected to the second input of feedback circuit, and the output end of the feedback circuit connects
The second input of pwm control circuit is connected to, the output end of the pwm control circuit is connected to by power switch circuit
Second end of the first primary coil of high frequency transformer, the second output end of the input detecting circuit are connected to detection instruction electricity
The input on road, the power end of the pwm control circuit is connected to the first end of the second primary coil of high frequency transformer, described
Second end of the second primary coil of high frequency transformer is connected to ground.
As further improvement of the utility model, the current rectifying and wave filtering circuit includes the first common mode inductance, second common
Mould inductance and rectifier bridge, the output end of the input detecting circuit pass sequentially through the first common mode inductance and the second common mode inductance and then
It is connected with the input of rectifier bridge, the output end of the rectifier bridge is respectively connecting to the of the first primary coil of high frequency transformer
One end and the first input end of pwm control circuit.
As further improvement of the utility model, second common mode inductance is common mode magnetic field inductance coil.
As further improvement of the utility model, the input detecting circuit includes first resistor, second resistance, first
Electric capacity, thermistor, the first Y capacitance, the second Y capacitance and connector, the first resistor and second resistance series connection are connected across the
Between the first input end of one common mode inductance and the second input, the both ends of first electric capacity are connected to the first common mode inductance
Between first input end and the second input, the first input end of first common mode inductance is connected to the first of thermistor
End, the second end of the thermistor are connected to live wire, and the second end of the thermistor passes through the first Y capacitance and lightning protection
Ground is connected, and the second input of first common mode inductance is connected with lightning protection by the second Y capacitance, first common mode
Second input of inductance is connected with zero line, and the first end of the connector and the second end of thermistor connect, the connection
Second end of device is connected with lightning protection, and the 3rd end of the connector is connected with the second input of the first common mode inductance.
As further improvement of the utility model, the feedback circuit is connected with pwm control circuit by photoelectrical coupler
Connect.
As further improvement of the utility model, the pwm control circuit includes PWM controller, and the power is opened
Powered-down road includes N-channel enhancement mode FET, and the input of the PWM controllers and the output end of feedback circuit connect,
The feeder ear of the PWM controller and the output end of current rectifying and wave filtering circuit connect, and the control terminal of the PWM controller is connected to N
The grid of channel enhancement FET, the source ground of the N-channel enhancement mode FET, the enhanced field of N-channel
The drain electrode of effect pipe is connected to the second end of the first primary coil of high frequency transformer.
As further improvement of the utility model, the first end of the secondary coil of the high frequency transformer, which is connected to, to flow
The input of circuit, the second end of the secondary coil of the high frequency transformer is with being connected to lightning protection.
As further improvement of the utility model, the flow equalizing circuit includes 3rd resistor, the second electric capacity, the 3rd electricity
Appearance, the first diode and the second diode, the first end of the secondary coil of the high frequency transformer is by passing sequentially through the 3rd electricity
Resistance and the second electric capacity and then the positive terminal of the 3rd electric capacity is connected to, the positive terminal and the second diode of first diode are just
The first end of the extreme secondary coil for being connected to high frequency transformer, the negative pole end of first diode and the second diode
Negative pole end is connected to the first input end of feedback circuit, the positive terminal of the 3rd electric capacity negative pole with the first diode respectively
End connects with the input of output filter circuit, and the negative pole end of the 3rd electric capacity is with being connected to lightning protection.
As further improvement of the utility model, the positive terminal of the 3rd electric capacity and the input of output filter circuit
Between be also associated with the first inductance.
As further improvement of the utility model, the detection indicating circuit includes the first light emitting diode, the second hair
Optical diode, the 3rd light emitting diode, the 3rd diode, the 4th diode, the 5th diode, the 4th resistance, the 5th resistance and
6th resistance, the first end of the connector are respectively connecting to the positive terminal of the first light emitting diode and the negative pole of the 5th diode
End, the negative pole end of first light emitting diode are connected to the positive terminal of the 3rd diode, the connector by the 4th resistance
The second end be connected respectively with the negative pole end of the 3rd diode and the negative pole end of the 4th diode, the 3rd end of the connector
It is connected respectively with the positive terminal of the second light emitting diode and the positive terminal of the 3rd light emitting diode, second light emitting diode
Negative pole end the positive terminal of the 4th diode is connected to by the 5th resistance, the negative pole end of the 3rd light emitting diode passes through
Six resistance are connected to the positive terminal of the 5th diode.
The beneficial effects of the utility model are：
A kind of input ground line detection circuit of the utility model, can be automatically right by input detecting circuit and detection indicating circuit
The terminals of input carry out detecting whether its live wire, ground wire and zero line connect normally, if there are abnormal conditions, send corresponding
Lamplight pointing, user is prompted to check circuit, so as to greatly improve the security that electrical appliance uses.
Brief description of the drawings
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings：
Fig. 1 is a kind of functional-block diagram for inputting ground line detection circuit of the utility model；
Fig. 2 is a kind of circuit theory diagrams for inputting input detecting circuit in ground line detection circuit of the utility model；
Fig. 3 is a kind of circuit theory diagrams for inputting flow equalizing circuit in ground line detection circuit of the utility model；
Fig. 4, which is that the utility model is a kind of, inputs in ground line detection circuit the circuit theory diagrams for detecting indicating circuit.
Embodiment
With reference to 1~Fig. 4 of figure, a kind of input ground line detection circuit of the utility model, include input detecting circuit, detection refers to
Show circuit, current rectifying and wave filtering circuit, power switch circuit, high frequency transformer, flow equalizing circuit, output filter circuit, pwm control circuit
And feedback circuit, the high frequency transformer include the first primary coil, the second primary coil and secondary coil, the input detection
First output end of circuit is connected to the input of current rectifying and wave filtering circuit, and the output end of the current rectifying and wave filtering circuit is respectively connecting to
The first end of the primary coil of high frequency transformer first and the first input end of pwm control circuit, the secondary of the high frequency transformer
Coil is connected to the input of flow equalizing circuit, and the first output end of the flow equalizing circuit is connected to by output filter circuit
The first input end of feedback circuit, the second output end of the flow equalizing circuit is connected to the second input of feedback circuit, described
The output end of feedback circuit is connected to the second input of pwm control circuit, and the output end of the pwm control circuit passes through power
On-off circuit and then the second end for being connected to the first primary coil of high frequency transformer, the second output of the input detecting circuit
End is connected to the input of detection indicating circuit, and the power end of the pwm control circuit is connected to the second original of high frequency transformer
The first end of sideline circle, the second end of the second primary coil of the high frequency transformer is connected to ground.
Preferably, the output end of the current rectifying and wave filtering circuit is connected to the starting electricity of PWM controller U1 in pwm control circuit
Flow input VIN, signal that PWM controller U1 is inputted by VIN pins is powered after starting by power end VDD, supply voltage by
One end of second primary coil is provided by diode and resistance, while VDD pins also pass through capacity earth.
Preferred embodiment is further used as, the current rectifying and wave filtering circuit includes the first common mode inductance, the second common mode
Inductance and rectifier bridge, the output end of the input detecting circuit pass sequentially through the first common mode inductance and the second common mode inductance so that with
The input connection of rectifier bridge, the output end of the rectifier bridge are respectively connecting to the first of the first primary coil of high frequency transformer
End and the first input end of pwm control circuit.
The effect of the common mode inductance is EMI filtering, and common mode inductance is substantially a bidirectional filter：On the one hand to filter
Except suppression common mode electromagnetic interference on signal wire, on the other hand suppression does not send out electromagnetic interference in itself again, avoids influenceing same electricity
The normal work of other electronic equipments under magnetic environment.
Preferred embodiment is further used as, second common mode inductance is common mode magnetic field inductance coil.
It is further used as preferred embodiment, the input detecting circuit includes first resistor R1, second resistance R2, the
One electric capacity C1, thermistor RT, the first Y capacitance Y1, the second Y capacitance Y2 and connector P, the first resistor R1 and second resistance
R2 series connection is connected across between the first input end of the first common mode inductance and the second input, the both ends connection of the first electric capacity C1
Between the first input end and the second input of the first common mode inductance, the first input end of first common mode inductance is connected to
Thermistor RT first end, the second end of the thermistor RT are connected to live wire, and the second end of the thermistor RT leads to
Cross the first Y capacitance Y1 to be connected, the second input of first common mode inductance by the second Y capacitance Y2 and is prevented with lightning protection
Thunder protecting field is connected, and the second input of first common mode inductance is connected with zero line, the first end and temperature-sensitive of the connector P
Resistance RT the second end connection, the second end of the connector P is connected with lightning protection, the 3rd end of the connector P and
The second input connection of first common mode inductance.
Preferably, the thermistor RT is NTC thermistor RT, and when circuit incoming transport power supply, electric current is by moment
Increase, and resistance value is high when NTC thermistor RT characteristic is low temperature, therefore current surge can be avoided, subsequently held in circuit
Continuous operating room, NTC thermistor RT temperature rise, no longer produces inhibitory action to the electric current in circuit.
Preferred embodiment is further used as, the feedback circuit is connected with pwm control circuit by photoelectrical coupler.
Preferred embodiment is further used as, the pwm control circuit includes PWM controller, the power switch
Circuit includes N-channel enhancement mode FET, and the input of the PWM controllers and the output end of feedback circuit connect, institute
The output end of the feeder ear and current rectifying and wave filtering circuit of stating PWM controller connects, and the control terminal of the PWM controller is connected to N ditches
The grid of the enhanced FET in road, the source ground of the N-channel enhancement mode FET, the enhanced field effect of N-channel
Should pipe drain electrode be connected to high frequency transformer the first primary coil the second end.
Preferred embodiment is further used as, the first end of the secondary coil of the high frequency transformer is connected to stream electricity
The input on road, the second end of the secondary coil of the high frequency transformer is with being connected to lightning protection.
Preferred embodiment is further used as, the flow equalizing circuit includes 3rd resistor R3, the second electric capacity C2, the 3rd electricity
Hold C3, the first diode D1 and the second diode D2, the first end of the secondary coil of the high frequency transformer is by passing sequentially through
3rd resistor R3 and the second electric capacity C2 and then be connected to the 3rd electric capacity C3 positive terminal, the positive terminal of the first diode D1 and
Second diode D2 positive terminal is connected to the first end of the secondary coil of high frequency transformer, and the first diode D1's is negative
Extreme and the second diode D2 negative pole end is connected to the first input end of feedback circuit, the positive terminal of the 3rd electric capacity C3
It is connected respectively with the first diode D1 negative pole end and the input of output filter circuit, the negative pole end of the 3rd electric capacity C3 connects
With being connected to lightning protection.
It is further used as preferred embodiment, the positive terminal of the 3rd electric capacity C3 and the input of output filter circuit
Between be also associated with the first inductance.
Preferred embodiment is further used as, the detection indicating circuit includes the first LED 1, second
LED 2, the 3rd LED 3, the 3rd diode D3, the 4th diode D4, the 5th diode D5, the 4th
Resistance R4, the 5th resistance R5 and the 6th resistance R6, the first end of the connector P are respectively connecting to the first LED 1
Positive terminal and the 5th diode D5 negative pole end, the negative pole end of first LED 1 connected by the 4th resistance R4
It is connected to the 3rd diode D3 positive terminal, the second end of connector P negative pole end and the 4th with the 3rd diode D3 respectively
Diode D4 negative pole end is connected, the 3rd end of the connector P respectively with the positive terminal of the second LED 2 and
The positive terminal of 3rd LED 3 is connected, and the negative pole end of second LED 2 passes through the 5th resistance R5
The 4th diode D4 positive terminal is connected to, the negative pole end of the 3rd LED 3 is connected to by the 6th resistance R6
5th diode D5 positive terminal.
In the utility model embodiment, when the first LED 1 detected in indicating circuit extinguishes, second is luminous
Diode (LED) 2 lights, and when the 3rd LED 3 extinguishes, represents that terminals are correct；When detecting first in indicating circuit
LED 1 lights, and the second LED 2 lights, and when the 3rd LED 3 lights, represents live wire not
Connect；When the first LED 1 detected in indicating circuit extinguishes, the second LED 2 lights, and the 3rd luminous two
When pole pipe LED3 is lighted, represent that zero line does not connect；When the first LED 1 detected in indicating circuit extinguishes, second is luminous
Diode (LED) 2 extinguishes, and when the 3rd LED 3 lights, represents live wire and ground wire dislocation；When detecting in indicating circuit
First LED 1 lights, and the second LED 2 extinguishes, and when the 3rd LED 3 extinguishes, represents fire
Line and zero line dislocation；When the first LED 1 detected in indicating circuit lights, the second LED 2 lights,
When 3rd LED 3 extinguishes, represent that ground wire does not connect；When the first LED 1 detected in indicating circuit puts out
Go out, the second LED 2 extinguishes, and when the 3rd LED 3 extinguishes, represents live wire and ground wire dislocation and ground wire is not
Connect.
Above is preferably implement to be illustrated to of the present utility model, but the utility model is created and is not limited to institute
State embodiment, those skilled in the art can also make a variety of etc. on the premise of without prejudice to the utility model spirit
With deformation or replace, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (10)
1. one kind input ground line detection circuit, it is characterised in that：Include input detecting circuit, detection indicating circuit, rectification filter
Wave circuit, power switch circuit, high frequency transformer, flow equalizing circuit, output filter circuit, pwm control circuit and feedback circuit, institute
Stating high frequency transformer includes the first primary coil, the second primary coil and secondary coil, and the first of the input detecting circuit is defeated
Go out end and be connected to the input of current rectifying and wave filtering circuit, the output end of the current rectifying and wave filtering circuit is respectively connecting to high frequency transformer the
The first end of one primary coil and the first input end of pwm control circuit, the secondary coil of the high frequency transformer are connected to
The input of current circuit, the first output end of the flow equalizing circuit are connected to the of feedback circuit by output filter circuit
One input, the second output end of the flow equalizing circuit are connected to the second input of feedback circuit, the feedback circuit it is defeated
Go out end and be connected to the second input of pwm control circuit, the output end of the pwm control circuit by power switch circuit and then
The second end of the first primary coil of high frequency transformer is connected to, the second output end of the input detecting circuit is connected to detection
The input of indicating circuit, the power end of the pwm control circuit are connected to the first of the second primary coil of high frequency transformer
End, the second end of the second primary coil of the high frequency transformer is connected to ground.
A kind of 2. input ground line detection circuit according to claim 1, it is characterised in that：The current rectifying and wave filtering circuit includes
There are the first common mode inductance, the second common mode inductance and rectifier bridge, the output end of the input detecting circuit passes sequentially through the first common mode
Inductance and the second common mode inductance and then it is connected with the input of rectifier bridge, the output end of the rectifier bridge is respectively connecting to high frequency change
The first end of the first primary coil and the first input end of pwm control circuit of depressor.
A kind of 3. input ground line detection circuit according to claim 2, it is characterised in that：Second common mode inductance is common
Mould magnetic field inductance coil.
A kind of 4. input ground line detection circuit according to claim 2, it is characterised in that：The input detecting circuit includes
First resistor, second resistance, the first electric capacity, thermistor, the first Y capacitance, the second Y capacitance and connector, the first resistor
And second resistance series connection is connected across between the first input end of the first common mode inductance and the second input, the two of first electric capacity
End is connected between the first input end of the first common mode inductance and the second input, the first input end of first common mode inductance
The first end of thermistor is connected to, the second end of the thermistor is connected to live wire, and the second end of the thermistor leads to
Cross the first Y capacitance to be connected, the second input of first common mode inductance is protected by the second Y capacitance and lightning protection with lightning protection
The connection of shield ground, the second input of first common mode inductance are connected with zero line, the first end and thermistor of the connector
The connection of the second end, the second end of the connector is connected with lightning protection, the 3rd end of the connector and the first common mode
The second input connection of inductance.
A kind of 5. input ground line detection circuit according to claim 1, it is characterised in that：The feedback circuit is controlled with PWM
Circuit processed is connected by photoelectrical coupler.
A kind of 6. input ground line detection circuit according to claim 1, it is characterised in that：The pwm control circuit includes
Have a PWM controller, the power switch circuit includes N-channel enhancement mode FET, the input of the PWM controller with
The output end connection of feedback circuit, the feeder ear of the PWM controller and the output end of current rectifying and wave filtering circuit connect, the PWM
The control terminal of controller is connected to the grid of N-channel enhancement mode FET, and the source electrode of the N-channel enhancement mode FET connects
Ground, the drain electrode of the N-channel enhancement mode FET are connected to the second end of the first primary coil of high frequency transformer.
A kind of 7. input ground line detection circuit according to claim 1, it is characterised in that：The secondary of the high frequency transformer
The first end of coil is connected to the input of flow equalizing circuit, and the second end of the secondary coil of the high frequency transformer is connected to lightning protection
Protecting field.
A kind of 8. input ground line detection circuit according to claim 1, it is characterised in that：The flow equalizing circuit includes the 3rd
Resistance, the second electric capacity, the 3rd electric capacity, the first diode and the second diode, the first of the secondary coil of the high frequency transformer
End is connected to the positive terminal of the 3rd electric capacity by passing sequentially through 3rd resistor and the second electric capacity, and first diode is just
Extreme and the second diode positive terminal is connected to the first end of the secondary coil of high frequency transformer, first diode
The negative pole end of negative pole end and the second diode is connected to the first input end of feedback circuit, the positive terminal point of the 3rd electric capacity
It is not connected with the negative pole end of the first diode and the input of output filter circuit, the negative pole end of the 3rd electric capacity is connected to anti-
Thunder protecting field.
A kind of 9. input ground line detection circuit according to claim 8, it is characterised in that：The positive terminal of 3rd electric capacity
The first inductance is also associated between the input of output filter circuit.
A kind of 10. input ground line detection circuit according to claim 4, it is characterised in that：The detection indicating circuit bag
Include the first light emitting diode, the second light emitting diode, the 3rd light emitting diode, the 3rd diode, the 4th diode, the five or two pole
Pipe, the 4th resistance, the 5th resistance and the 6th resistance, the first end of the connector are being respectively connecting to the first light emitting diode just
Extreme and the 5th diode negative pole end, the negative pole end of first light emitting diode are connected to the three or two pole by the 4th resistance
The positive terminal of pipe, the second end of the connector are connected with the negative pole end of the 3rd diode and the negative pole end of the 4th diode respectively
Connect, the 3rd end of the connector is connected with the positive terminal of the second light emitting diode and the positive terminal of the 3rd light emitting diode respectively
Connect, the negative pole end of second light emitting diode is connected to the positive terminal of the 4th diode, the 3rd hair by the 5th resistance
The negative pole end of optical diode is connected to the positive terminal of the 5th diode by the 6th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720369773.6U CN206832916U (en) | 2017-04-10 | 2017-04-10 | One kind input ground line detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720369773.6U CN206832916U (en) | 2017-04-10 | 2017-04-10 | One kind input ground line detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206832916U true CN206832916U (en) | 2018-01-02 |
Family
ID=60767051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720369773.6U Active CN206832916U (en) | 2017-04-10 | 2017-04-10 | One kind input ground line detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206832916U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007185A (en) * | 2019-04-18 | 2019-07-12 | 君凯迪科技(深圳)有限公司 | A kind of detection circuit and method for single-phase zero curve and firewire and ground wire |
| CN111551842A (en) * | 2020-05-13 | 2020-08-18 | 宁波甬安安全科技有限公司 | Lightning protection ground wire monitoring system and method |
| CN112327210A (en) * | 2020-11-06 | 2021-02-05 | 深圳英飞源技术有限公司 | Low-voltage wire harness fault detection circuit and method for energy storage battery system |
-
2017
- 2017-04-10 CN CN201720369773.6U patent/CN206832916U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007185A (en) * | 2019-04-18 | 2019-07-12 | 君凯迪科技(深圳)有限公司 | A kind of detection circuit and method for single-phase zero curve and firewire and ground wire |
| CN111551842A (en) * | 2020-05-13 | 2020-08-18 | 宁波甬安安全科技有限公司 | Lightning protection ground wire monitoring system and method |
| CN112327210A (en) * | 2020-11-06 | 2021-02-05 | 深圳英飞源技术有限公司 | Low-voltage wire harness fault detection circuit and method for energy storage battery system |
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