CN208737332U - High voltage supply system for residual current detection - Google Patents
High voltage supply system for residual current detection Download PDFInfo
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- CN208737332U CN208737332U CN201821151119.9U CN201821151119U CN208737332U CN 208737332 U CN208737332 U CN 208737332U CN 201821151119 U CN201821151119 U CN 201821151119U CN 208737332 U CN208737332 U CN 208737332U
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Abstract
The utility model provides a kind of high voltage supply system for residual current detection, including rectification circuit, high-voltage starting circuit, detection circuit and driving circuit, rectification circuit input end accesses AC voltage and to AC voltage commutation, and rectification circuit output end connects high-voltage starting circuit；High-voltage starting circuit forms burning voltage to the high voltage stabilizing after rectifier circuit rectifies, and provides burning voltage to detection circuit and driving circuit.The utility model delicate structure, design are rationally and cost is relatively low；The utility model is applied widely, directly by high pressure is supplied to start-up circuit, and start-up circuit generation burning voltage greatly reduces system power dissipation；The utility model is directly powered by depletion type NMOSFET transistor M1, realizes the stable power-supplying to internal detection circuitry by LDO.
Description
Technical field
The utility model relates to circuit detection fields, and in particular, to the high voltage supply system for residual current detection.
Background technique
In the application of traditional residual current detecting, the power supply mode of detection circuit is usually AC voltage by all-wave or half
After wave rectifier bridge, by a high voltage startup resistance, filter capacitor and pressure stabilizing/clamp circuit constitute power supply system, to inspection
Slowdown monitoring circuit provides a stable power supply.But a main problem existing for traditional structure is, in different application AC
Voltage (virtual value) range is from 36V-300V, requirement with higher for the design of start-up resistor and voltage regulator circuit in this way: electricity
It hinders excessive, will lead to compared under low AC voltages, voltage regulator circuit can not provide enough voltage and cause detection circuit normal
Work；Resistance is too small, will lead under higher AC voltage, and start-up resistor can not only consume the power more crossed, while can also lead
Cause start-up resistor and the excessively high initiation integrity problem of voltage regulator circuit temperature.Voltage regulator circuit and start-up resistor usually require largely simultaneously
Resolution element causes system cost and volume to rise.
Utility model content
For the defects in the prior art, the purpose of the utility model is to provide a kind of high pressures for residual current detection
Power supply system.
According to a kind of high voltage supply system for residual current detection provided by the utility model, including rectification circuit,
High-voltage starting circuit, detection circuit and driving circuit, in which:
Rectification circuit input end accesses AC voltage and to AC voltage commutation, and rectification circuit output end connects high voltage startup electricity
Road；
High-voltage starting circuit forms burning voltage to the high voltage stabilizing after rectifier circuit rectifies, and provide burning voltage to
Detection circuit and driving circuit.
Preferably, the rectification circuit includes rectifier bridge.
Preferably, input is terminated with varistor between two of the rectifier bridge.
Preferably, the high-voltage starting circuit includes depletion type NMOSFET transistor M1, detection resistance R1, detection resistance
R2, control circuit and linear voltage regulator, in which:
Depletion type NMOSFET transistor M1 drain electrode access rectification circuit output end, depletion type NMOSFET transistor M1 grid
Control circuit output end is connected, the source electrode connecting detection one end resistance R1 transistor M1 depletion type NMOSFET and linear voltage regulator are defeated
Enter end；
The one end detection resistance R1 other end connecting detection resistance R2, detection resistance R2 other end ground connection；
Node between detection resistance R1 and detection resistance R2 connects control circuit input terminal.
Preferably, the control circuit includes amplifier.
Preferably, the detection circuit internal detection circuitry and outer detecting circuit, the external inspection of internal detection circuitry connection
Slowdown monitoring circuit, outer detecting circuit include residual current transformer, diode D6, diode D7, resistance RX, resistance RINAnd capacitor
CIN, in which:
AC circuit runs through residual current transformer；
Residual current transformer one end connects resistance RINOne end, resistance RXOne end, diode D6 cathode and diode D7
Anode；
The residual current transformer other end connects capacitor CINOne end, resistance RXThe other end, diode D6 anode and two poles
Pipe D7 cathode；
Capacitor CINThe other end connects resistance RINThe other end.
It preferably, further include silicon-controlled D5 and capacitor COS, in which:
Silicon-controlled D5 anode connects rectification circuit output end, and silicon-controlled D5 cathode ground connection, SCR control end connects capacitor
COSOne end and driving circuit, capacitor COSThe other end ground connection.
It preferably, further include tripping coil, the tripping coil is set between AC circuit and rectification circuit, tripping coil
For controlling the on-off of AC circuit.
Compared with prior art, the utility model have it is following the utility model has the advantages that
1, the utility model delicate structure, design are rationally and cost is relatively low；
2, the utility model is applied widely, directly by high pressure is supplied to start-up circuit, start-up circuit generate stablize it is electric
Pressure, greatly reduces system power dissipation；
3, the utility model is directly powered by depletion type NMOSFET transistor M1, is realized by LDO and is examined to inside
The stable power-supplying of slowdown monitoring circuit.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other spies of the utility model
Sign, objects and advantages will become more apparent upon:
Fig. 1 is traditional residual current detection circuit power supply system figure；
Fig. 2 is the circuit diagram of the high voltage supply system provided by the utility model for residual current detection；
Fig. 3 is the circuit of the start-up circuit of the high voltage supply system provided by the utility model for residual current detection
Figure；
Fig. 4 is the specific of the start-up circuit of the high voltage supply system provided by the utility model for residual current detection
Implementing circuit figure.
Specific embodiment
The utility model is described in detail combined with specific embodiments below.Following embodiment will be helpful to this field
Technical staff further understands the utility model, but does not limit the utility model in any form.It should be pointed out that ability
For the those of ordinary skill in domain, without departing from the concept of the premise utility, several changes and improvements can also be made.
These are all within the protection scope of the present invention.
In the application of traditional residual current detecting, the power supply mode of detection circuit is usually AC voltage by all-wave or half
After wave rectifier bridge, by a high voltage startup resistance, filter capacitor and pressure stabilizing/clamp circuit constitute power supply system, to inspection
Slowdown monitoring circuit provides a stable power supply, as shown in Figure 1.But a main problem existing for traditional structure is, different
Application AC voltage (virtual value) range in this way has the design of start-up resistor and voltage regulator circuit higher from 36V-300V
Requirement: resistance is excessive, will lead to compared under low AC voltages, voltage regulator circuit can not provide enough voltage and lead to detection circuit
Cisco unity malfunction；Resistance is too small, will lead under higher AC voltage, and start-up resistor can not only consume the power more crossed, together
When also result in start-up resistor and the excessively high initiation integrity problem of voltage regulator circuit temperature.Voltage regulator circuit and start-up resistor are usual simultaneously
A large amount of resolution elements are needed, system cost and volume is caused to rise.
Therefore, the utility model provides a kind of new high voltage supply system for residual current detection, such as Fig. 2 to figure
Shown in 4, remove the clamper/voltage regulator circuit and corresponding peripheral original part in conventional method.AC voltage directly mentions after over commutation
Supply is directly supplied to high-voltage starting circuit by high pressure IO, high-voltage starting circuit is by exhausting without any peripheral original part
Type NMOSFET transistor M1 generates a stable voltage and is supplied to internal detection circuitry and driving circuit, thus in maximum journey
System power dissipation and cost are reduced on degree.The specific structure of the high voltage supply system of the utility model is as follows:
The utility model includes rectification circuit, integrated chip and outer detecting circuit, and rectification circuit accesses integrated chip,
Integrated chip connects outer detecting circuit, and the integrated chip includes high-voltage starting circuit, driving circuit and internal detection electricity
Road, the high-voltage starting circuit input terminal connect rectification circuit, and high-voltage starting circuit output end connects driving circuit and internal inspection
Slowdown monitoring circuit, internal detection circuitry connect outer detecting circuit, and driving circuit is circumscribed with capacitor and diode, due to inside detection electricity
Road and driving circuit are this field custom circuit, and this patent is no longer specifically unfolded.
Further, the rectification circuit is rectifier bridge structure, and rectification as shown in Figure 2 is made up of diode D1-D4
Bridge, the input terminal of rectifier bridge access AC circuit, and the output end of rectifier bridge connects high-voltage starting circuit, more specifically, rectifier bridge
It is connected to varistor MOV between two input terminals, for protecting rectifier bridge, rectifier bridge controls its on-off by tripping coil L1.
In more detail, the high-voltage starting circuit includes depletion type NMOSFET transistor M1, detection resistance R1, detection
Resistance R2, control circuit and linear voltage regulator LDO, in which: detection resistance R1, detection resistance R2 are for monitoring output voltage
VDDH, and send testing result Vsense in control circuit, control circuit can be according to the Vsense voltage and reference monitored
Relationship between voltage Vref generates the grid voltage Vgate of control M1, in which: grid voltage Vgate and output voltage VDDH
Between pressure difference control the final burning voltage of Vsense be equal to reference voltage Vref；Depletion type NMOSFET transistor M1 drain electrode connects
Enter rectification circuit output end, depletion type NMOSFET transistor M1 grid connects control circuit output end, and depletion type NMOSFET is brilliant
Body source electrode connecting detection one end resistance R1 pipe M1 and linear voltage regulator LDO input terminal；Detection resistance R1 other end connecting detection electricity
Hinder the one end R2, detection resistance R2 other end ground connection；Node connection control circuit between detection resistance R1 and detection resistance R2 is defeated
Enter end, the control circuit includes amplifier.
Further, the outer detecting circuit includes residual current transformer ZCT, diode D6, diode D7, electricity
Hinder RX, resistance RINAnd capacitor CIN, in which: AC circuit runs through residual current transformer；The connection of the one end residual current transformer ZCT
Resistance RINOne end, resistance RXOne end, diode D6 cathode and diode D7 anode；The residual current transformer ZCT other end connects
Meet capacitor CINOne end, resistance RXThe other end, diode D6 anode and diode D7 cathode；Capacitor CINThe other end connects resistance
RINThe other end, resistance RINThe other end, resistance RXThe other end is respectively connected to internal detection circuitry.
It in more detail, further include silicon-controlled D5 and capacitor COS, silicon-controlled D5 anode connection rectification circuit output end, controllably
Silicon D5 cathode ground connection, SCR control end connect capacitor COSOne end and driving circuit, capacitor COSThe other end ground connection.
Specific embodiment according to the present utility model, as shown in figure 4, the depletion type NMOSFET transistor of the utility model
The pressure resistance of M1 is 700V, and the pressure resistance of triode M2 is 12V, and resistor network R3 and R4 close the border depletion type NMOSFET crystalline substance for setting
The threshold voltage of body pipe M1.It is directly connected to high pressure by the drain of depletion type NMOSFET transistor M1, is generated by control circuit
The grid of one voltage control depletion type MOS FET, generates a stable voltage 12V.Due to there is no capacitor after rectifier bridge, because
This will appear the case where rectified voltage is lower than 12V at the trough bottom M, will cause 12V and generates fluctuation at the lowest point, therefore is increasing
Add level-one LDO that 12V is transformed into 5V, this 5V voltage is stable work, and is supplied to internal detection circuitry power supply.In this way
A stable 5V voltage is provided to internal detection circuitry by two-stage LDO structure.
When Vsense is higher than Vref, VDDH is represented higher than setting value, the output of comparator is height, and triode M2 is opened
(the common NMOS that triode M2 is pressure resistance 12V), Vgate voltage is lower than the threshold voltage control of depletion type NMOSFET transistor M1
M1 processed is closed the border, and Vgate voltage is set by the ratio of R3 and R4.Conversely, when Vsense is lower than Vref, depletion type NMOSFET is brilliant
Body pipe M1 is opened.So final stable state when, VDDH is close to setting value.Wherein: VDDH are as follows:
The utility model is directly powered by depletion type NMOSFET transistor M1, is realized by LDO and is detected to inside
The stable power-supplying of circuit.It should be noted that 12V and 5V provided by the utility model are that data are embodied, in practical application
Including being not limited to specific voltage.
Specific embodiment of the utility model is described above.It is to be appreciated that the utility model not office
It is limited to above-mentioned particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims,
This has no effect on the substantive content of the utility model.In the absence of conflict, the spy in embodiments herein and embodiment
Sign can be arbitrarily combined with each other.
Claims (8)
1. a kind of high voltage supply system for residual current detection, which is characterized in that including rectification circuit, high voltage startup electricity
Road, detection circuit and driving circuit, in which:
Rectification circuit input end accesses AC voltage and to AC voltage commutation, and rectification circuit output end connects high-voltage starting circuit；
High-voltage starting circuit forms burning voltage to the high voltage stabilizing after rectifier circuit rectifies, and provides burning voltage to detection
Circuit and driving circuit.
2. the high voltage supply system according to claim 1 for residual current detection, which is characterized in that the rectified current
Road includes rectifier bridge.
3. the high voltage supply system according to claim 2 for residual current detection, which is characterized in that the rectifier bridge
Two between input be terminated with varistor.
4. the high voltage supply system according to claim 1 for residual current detection, which is characterized in that the high pressure opens
Dynamic circuit includes depletion type NMOSFET transistor M1, detection resistance R1, detection resistance R2, control circuit and linear voltage regulator,
Wherein:
Depletion type NMOSFET transistor M1 drain electrode access rectification circuit output end, the connection of depletion type NMOSFET transistor M1 grid
Control circuit output end, the source electrode connecting detection one end resistance R1 transistor M1 depletion type NMOSFET and linear voltage regulator input terminal；
The one end detection resistance R1 other end connecting detection resistance R2, detection resistance R2 other end ground connection；
Node between detection resistance R1 and detection resistance R2 connects control circuit input terminal.
5. the high voltage supply system according to claim 4 for residual current detection, which is characterized in that the control electricity
Road includes amplifier.
6. the high voltage supply system according to claim 1 for residual current detection, which is characterized in that the detection electricity
Road internal detection circuitry and outer detecting circuit, internal detection circuitry connect outer detecting circuit, and outer detecting circuit includes surplus
Aftercurrent mutual inductor, diode D6, diode D7, resistance RX, resistance RINAnd capacitor CIN, in which:
AC circuit runs through residual current transformer；
Residual current transformer one end connects resistance RINOne end, resistance RXOne end, diode D6 cathode and diode D7 anode；
The residual current transformer other end connects capacitor CINOne end, resistance RXThe other end, diode D6 anode and diode D7
Cathode；
Capacitor CINThe other end connects resistance RINThe other end.
7. the high voltage supply system according to claim 1 for residual current detection, which is characterized in that further include controllable
Silicon D5 and capacitor COS, in which:
Silicon-controlled D5 anode connects rectification circuit output end, and silicon-controlled D5 cathode ground connection, SCR control end connects capacitor COS's
One end and driving circuit, capacitor COSThe other end ground connection.
8. the high voltage supply system according to claim 1 for residual current detection, which is characterized in that further include tripping
Coil, the tripping coil are set between AC circuit and rectification circuit, and tripping coil is used to control the on-off of AC circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821151119.9U CN208737332U (en) | 2018-07-19 | 2018-07-19 | High voltage supply system for residual current detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821151119.9U CN208737332U (en) | 2018-07-19 | 2018-07-19 | High voltage supply system for residual current detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208737332U true CN208737332U (en) | 2019-04-12 |
Family
ID=66027716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821151119.9U Active CN208737332U (en) | 2018-07-19 | 2018-07-19 | High voltage supply system for residual current detection |
Country Status (1)
| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108803758A (en) * | 2018-07-19 | 2018-11-13 | 上海谷为电子科技有限公司 | High voltage supply system for residual current detection |
| CN110456232A (en) * | 2019-09-02 | 2019-11-15 | 北京智芯微电子科技有限公司 | The low-power current detection circuit of the independent powering mode of fault detector battery |
-
2018
- 2018-07-19 CN CN201821151119.9U patent/CN208737332U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108803758A (en) * | 2018-07-19 | 2018-11-13 | 上海谷为电子科技有限公司 | High voltage supply system for residual current detection |
| CN110456232A (en) * | 2019-09-02 | 2019-11-15 | 北京智芯微电子科技有限公司 | The low-power current detection circuit of the independent powering mode of fault detector battery |
| CN110456232B (en) * | 2019-09-02 | 2021-07-27 | 北京智芯微电子科技有限公司 | Low-power-consumption current detection circuit of fault indicator battery independent power supply mode |
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