CN106033879B - Breaking protection circuit - Google Patents
Breaking protection circuit Download PDFInfo
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- CN106033879B CN106033879B CN201510102957.1A CN201510102957A CN106033879B CN 106033879 B CN106033879 B CN 106033879B CN 201510102957 A CN201510102957 A CN 201510102957A CN 106033879 B CN106033879 B CN 106033879B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/33—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a kind of breaking protection circuits.Breaking protection circuit includes zero sequence current mutual inductor, leakage current detection circuit, peak detection circuit and microprocessor.Zero sequence current mutual inductor is to according to the leakage current generation induced current between load system and power-supply system.Induced current is converted to voltage signal by leakage current detection circuit to receive induced current.Peak detection circuit is detecting faradic peak value, and draws high voltage signal when peak value is more than saturation threshold.Microprocessor is to receiving voltage signal, and the supply path when voltage signal is more than voltage threshold between cut-out load system and power-supply system.
Description
Technical field
The present invention relates to a kind of breaking protection circuit, it is especially a kind of comprising peak detection circuit to compensate leakage current test
The breaking protection circuit of circuit.
Background technology
Breaking protection circuit often utilizes zero sequence current mutual inductor (zero current transformer, ZCT) to detect
Leakage current between load system and power-supply system, however the magnetic material due to zero sequence current mutual inductor, coil characteristics or its
His parameter has its limitation, therefore when causing the electromagnetic induction of zero sequence current mutual inductor to reach saturation when leakage current is larger, zero sequence
Induced current caused by current transformer can may rapidly decline, and can not linearly react the size of leakage current；Such as
This one, breaking protection circuit is that can not cut off circuit between load system and power-supply system in real time, and leakage current is caused to be held
The efficiency and safety of continuous influence system.
The breaking protection circuit of the prior art often utilizes the magnetic material or modification line replaced inside zero sequence current mutual inductor
The mode of the turn ratio attempts to improve the linear working range of zero sequence current mutual inductor, however such modification mode is too time-consuming,
It can not may also promptly coordinate the demand of various systems.In addition, the breaking protection circuit of the prior art may also utilize micro- place
The induced current that reason device compensation zero sequence current mutual inductor is exported, however such way needs a large amount of experiment suitable to research and develop
The algorithm of different system and microprocessor, and since breaking protection circuit needs the algorithm of high stability, may also can
A large amount of calculation resources of microprocessor are occupied, and increase the complexity of system.
Invention content
It is an object of the present invention to proposing a kind of breaking protection circuit, and it is negative not excessively to increase additional system
Load.Circuit protection circuit includes zero sequence current mutual inductor, leakage current detection circuit, peak detection circuit and microprocessor.Zero sequence
Current transformer is coupled to load system and power-supply system, to generate sense according to the leakage current between load system and power-supply system
Induced current.Leakage current detection circuit is coupled to zero sequence current mutual inductor, to receive induced current, and induced current is converted to
Voltage signal.Peak detection circuit is coupled to zero sequence current mutual inductor and leakage current detection circuit, faradic to detect
Peak value, and when peak value is more than saturation threshold, draw high voltage signal.Microprocessor is to receiving voltage signal, and works as voltage and believe
When number being more than voltage threshold, the supply path between load system and power-supply system is cut off.
Description of the drawings
Fig. 1 is the schematic diagram of the breaking protection circuit of one embodiment of the invention.
Fig. 2 is the leakage current detection circuit of one embodiment of the invention and the schematic diagram of peak detection circuit.
Wherein, the reference numerals are as follows：
100 breaking protection circuits
110 zero sequence current mutual inductors
112 iron rings
114 coils
120 leakage current detection circuits
122 sampling resistors
124 amplifier modules
130 peak detection circuits
132 Buffer output circuits
140 microprocessors
A load systems
B power-supply systems
I1Leakage current
I2Induced current
VgndGround voltage
VcurrentVoltage signal
R1-R9 resistance
T1-T6 transistors
D1 diodes
V1, V2 system voltage
Specific implementation mode
Fig. 1 is the schematic diagram of the breaking protection circuit 100 of one embodiment of the invention.Breaking protection circuit 100 includes zero sequence
Current transformer 110, leakage current detection circuit 120, peak detection circuit 130 and microprocessor 140.Zero sequence current mutual inductor
110 are coupled to load system A and power-supply system B, to generate sense according to the leakage current I1 between load system A and power-supply system B
Induced current I2.Leakage current detection circuit 120 is coupled to zero sequence current mutual inductor 110, to receive induced current I2, and will induction
Electric current I2 is converted to voltage signal Vcurrent., in an embodiment of the present invention, voltage signal Vcurrent can be AC signal
Or direct current signal.Peak detection circuit 130 is coupled to zero sequence current mutual inductor 110 and leakage current detection circuit 120, to detect
The peak value of induced current I2.When the peak value of induced current I2 is more than saturation threshold, peak detection circuit 130 can draw high voltage letter
Number Vcurrent.Microprocessor 140 can be used to receiving voltage signal Vcurrent, and when voltage signal Vcurrent is more than voltage
When threshold value, the supply path between load system A and power-supply system B is cut off.
In an embodiment of the present invention, zero sequence current mutual inductor 110 may include iron ring 112 and coil 114, and iron ring 112 can
The circuit flowed through around leakage current I1, and coil 114 can be then wound on iron ring 112, thus, when leakage current I1 is generated
Or when variation, the coil 114 of zero sequence current mutual inductor 110 will produce induced current I2, however the open circuit protection of the present invention is electric
Road is not limited with zero sequence current mutual inductor 110, and in other embodiments of the invention, zero sequence current mutual inductor also may include
Other assemblies or other constructions.In addition, in the embodiment in figure 1, leakage current detection circuit 120 may include sampling resistor 122 and
Amplifier module 124.Sampling resistor 122 has first end and second end, and it is mutual that the first end of sampling resistor 122 is coupled to zero-sequence current
Sensor 110, and the second end of sampling resistor 122 then can receive ground voltage Vgnd.When induced current I2 flows through sampling resistor 122,
The voltage difference between the first end and second end of sampling resistor 122, amplifier module 124 can be caused to can be used to amplify sampling resistor
Cross-pressure between 122 first end and second end is to generate voltage signal Vcurrent.The breaking protection circuit of the present invention is not
It is limited with the embodiment of Fig. 1, in other embodiments of the invention, leakage current detection circuit also may include other components with standard
Induced current really is converted into voltage signal.In the section Example of the present invention, leakage current detection circuit can be used to detect
The induced current that frequency is 50 hertz to 100000 hertz.
Fig. 2 is the leakage current detection circuit 120 of one embodiment of the invention and the schematic diagram of peak detection circuit 130.In Fig. 2
In, peak detection circuit 130 may include resistance R1-R4, transistor T1-T3 and Buffer output circuit 132.Resistance R1 has first
End and second end, the first end of resistance R1 are coupled to the first end of sampling resistor 122.Transistor T1 has first end, second end
And control terminal, the second end of transistor T1 receives ground voltage Vgnd, and the control terminal of transistor T1 is coupled to the second of resistance R1
End.There is transistor T2 first end, second end and control terminal, the first end of transistor T2 to be coupled to the second end of transistor T1,
And the control terminal of transistor T2 is coupled to the second end of resistance R1.Resistance R2 have first end and second end, the first of resistance R2
End receives system voltage V1, and the second end of resistance R2 is coupled to the first end of transistor T1.Resistance R3 has first end and the
Two ends, the first end of resistance R3 is coupled to the second end of transistor T2, and the second end of resistance R3 receives system voltage V2.Resistance
There is R4 first end and second end, the first end of resistance R4 to be coupled to the second end of resistance R2.Transistor T3 has first end, the
Two ends and control terminal, the first end of transistor T3 are coupled to the second end of resistance R4, and the second end of transistor T3 receives ground voltage
Vgnd, and the control terminal of transistor T3 is coupled to the first end of resistance R3.Buffer output circuit 132 is coupled to leakage current test electricity
The first end of road 120 and transistor T3, when the voltage of the first end of transistor T3 is ground voltage Vgnd, to draw high voltage letter
Number Vcurrent.In one embodiment of this invention, transistor T1 and transistor T3 can be NPN double carrier transistors, and crystal
Pipe T2 can be PNP bipolar transistor, and system voltage V1 can be higher than ground voltage Vgnd, and ground voltage Vgnd can be higher than system electricity
Press V2；In another embodiment of the invention, transistor T1 and transistor T3 also can be N-channel metal-oxide half field effect transistor, and
Transistor T2 can be P-channel metal-oxide half field effect transistor；However the present invention is not limited thereto, in the other embodiment of the present invention
In, breaking protection circuit also can be according to the transistor for needing to select appropriate type of system.
In the embodiment of fig. 2, Buffer output circuit 132 includes resistance R5-R9, transistor T4-T6 and diode D1.Electricity
Hindering R5, there is first end and second end, the first end of resistance R5 to be coupled to the first end of transistor T3.Diode D1 has anode
And cathode, the anode of diode D1 receives ground voltage Vgnd, and the cathode of diode D1 is coupled to the second end of resistance R5.Crystal
Pipe T4 has first end, second end and a control terminal, and the second end of transistor T4 receives ground voltage Vgnd, and the control of transistor T4
End is coupled to the second end of resistance R5.Diode D1 can avoid the control terminal of transistor T4 and second end is reversed electric current breakdown.
Transistor T5 has first end, second end and a control terminal, and the second end of transistor T5 receives ground voltage Vgnd, and transistor T5
Control terminal is coupled to the first end of transistor T4.There is resistance R6 first end and second end, the first end of resistance R6 to receive first
System voltage V1, and the second end of resistance R6 is coupled to the first end of transistor T4.Resistance R7 has first end and second end, electricity
The first end for hindering R7 receives the first system voltage V1, and the second end of resistance R7 is coupled to the first end of transistor T5.Resistance R8
With first end and second end, the first end of resistance R8 is coupled to the second end of resistance R7.Transistor T6 has first end, second
The first end of end and control terminal, transistor T6 receives the first system voltage V1, and the control terminal of transistor T6 is coupled to resistance R8
Second end.There is resistance R9 first end and second end, the first end of resistance R9 to be coupled to the second end and resistance of transistor T6
The second end of R9 is coupled to leakage current detection circuit 120.In one embodiment of this invention, transistor T4 and transistor T5 can be
NPN double carrier transistors, and transistor T6 can be PNP bipolar transistor, however the present invention is not limited thereto.
When induced current I2 is smaller, the cross-pressure between the first end and second end of sampling resistor 122 is also smaller, therefore brilliant
Body pipe T1 and T2 can be ended, and the control terminal of transistor T3 can receive system voltage V2 and be ended at this time, therefore transistor
T4 can be switched on so that transistor T5 and T6 are also ended, and peak detection circuit 130 will not be to leakage current detection circuit at this time
120 compensate.When induced current I2 is larger, the cross-pressure between the first end and second end of sampling resistor 122 can carry therewith
It rises.In one of present invention embodiment, when the peak value of induced current I2 be more than saturation threshold when, 122 both ends of sampling resistor across
Pressure will be lifted to the voltage for being enough to be connected transistor T1 or T2.For example, when induced current I2 is by the of sampling resistor 122
When one end flows to second end, promoted with the cross-pressure of sampling resistor 122, therefore transistor T1 may be connected.And work as induced electricity
When stream I2 flows to first end by the second end of sampling resistor 122, promoted with the cross-pressure of sampling resistor 122, transistor T2
It can therefore be connected.As long as any of transistor T1 or T2 are switched on, transistor T3 can be also switched on.Thus, crystal
Pipe T4 can be ended so that transistor T5 and T6 are all switched on, and the current potential of the second end of resistance R9 i.e. can by with drawing high, into
And voltage signal Vcurrent is drawn high, that is, peak detection circuit 130 can compensate leakage current detection circuit 120.
According to the characteristic of zero sequence current mutual inductor 110 and the demand of system, the adjustable sampling electricity of breaking protection circuit 100
122 resistance value is hindered to select the saturation threshold of induced current I2, that is, the resistance value of sampling resistor can be related to saturation threshold.Citing
For, if the range for the induced current I2 that zero sequence current mutual inductor 110 can be output is smaller, the larger sampling of resistance value may be selected
Resistance 122, thus, which transistor T1 and T2 can be easier the saturation threshold for being switched on, therefore reaching in induced current I2
When, make peak detection circuit 130 that can draw high voltage signal Vcurrent in real time, to reach compensation leakage current detection circuit 120
Purpose.
By peak detection circuit 130, saturation threshold that breaking protection circuit 100 can reach in the peak value of induced current I2
When value, voltage signal Vcurrent is drawn high, to achieve the purpose that compensate leakage current detection circuit 120.And it is directed to different systems
Demand, it is only necessary to which the resistance value for adjusting sampling resistor 122 can be adjusted the opportunity of compensation, and need not replace zero sequence current mutual inductor
110 material and the algorithm of complexity.
In conclusion disclosed herein a kind of breaking protection circuit, by the peak detection circuit of breaking protection circuit,
Breaking protection circuit proposed by the invention can the induced current caused by zero sequence current mutual inductor when reaching saturation value, in due course
The voltage signal that the current detection circuit of ground compensation breaking protection circuit is exported, and breaking protection circuit is enable to cut off in real time
Circuit between load system and power-supply system, and avoid leakage current long lasting effect system effectiveness and safety.Due to nothing of the present invention
The material of zero sequence current mutual inductor must be replaced, also without complicated algorithm, therefore the breaking protection circuit of the present invention can relatively previously
Technology is more simple and efficient.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of breaking protection circuit, it is characterised in that include：
Zero sequence current mutual inductor (110), is coupled to load system and power-supply system, to according to the load system and the power supply system
Leakage current between system generates induced current；
Leakage current detection circuit (120) is coupled to the zero sequence current mutual inductor (110), to receive the induced current, and should
Induced current is converted to voltage signal,
The leakage current detection circuit (120) includes：
There is sampling resistor (122) first end and second end, the first end of the sampling resistor (122) to be coupled to the zero-sequence current
The second end of mutual inductor (110) and the sampling resistor (122) receives ground voltage；And
Amplifier module (124), the cross-pressure between first end and second end to amplify the sampling resistor (122) is to generate the electricity
Press signal；
Peak detection circuit (130) is coupled to the zero sequence current mutual inductor (110) and the leakage current detection circuit (120), to
The faradic peak value is detected, and when the peak value is more than saturation threshold, draws high the voltage signal；And
Microprocessor (140) to receive the voltage signal, and when the voltage signal is more than voltage threshold, cuts off the load
Supply path between system and the power-supply system.
2. breaking protection circuit as described in claim 1, it is characterised in that the faradic frequency be 50 hertz extremely
100000 hertz.
3. breaking protection circuit as described in claim 1, it is characterised in that the peak detection circuit (130) includes：
There is first resistor first end and second end, the first end of the first resistor to be coupled to being somebody's turn to do for the sampling resistor (122)
First end；
There is the first transistor first end, second end and control terminal, the second end of the first transistor to receive the ground voltage,
And the control terminal of the first transistor is coupled to the second end of the first resistor；
There is second transistor first end, second end and control terminal, the first end of the second transistor to be coupled to first crystalline substance
The second end of body pipe and the control terminal of the second transistor are coupled to the second end of the first resistor；
Second resistance, has first end and a second end, the first end of the second resistance receive the first system voltage and this second
The second end of resistance is coupled to the first end of the first transistor；
3rd resistor, has first end and a second end, the first end of the 3rd resistor be coupled to the second transistor this
The second end of two ends and the 3rd resistor receives second system voltage；
4th resistance, has first end and a second end, the first end of the 4th resistance be coupled to the second resistance this second
End；
There is third transistor first end, second end and control terminal, the first end of the third transistor to be coupled to the 4th electricity
The second end of the second end of resistance, the third transistor receives the ground voltage and the control terminal coupling of the third transistor
In the first end of the 3rd resistor；And
Buffer output circuit (132) is coupled to the leakage current detection circuit (120) and the first end of the third transistor, uses
When the voltage of the first end of the third transistor is the ground voltage, to draw high the voltage signal.
4. breaking protection circuit as claimed in claim 3, it is characterised in that the resistance of the saturation threshold and the sampling resistor (122)
Value is related.
5. breaking protection circuit as claimed in claim 3, it is characterised in that the first transistor and the third transistor are NPN
Double carrier transistor, the second transistor are PNP bipolar transistor.
6. breaking protection circuit as claimed in claim 3, it is characterised in that the first transistor and the third transistor are N ditches
Road metal-oxide half field effect transistor, the second transistor are P-channel metal-oxide half field effect transistor.
7. breaking protection circuit as claimed in claim 3, it is characterised in that the first system voltage is higher than the ground voltage, the ground
Voltage is higher than the second system voltage.
8. breaking protection circuit as claimed in claim 3, it is characterised in that the Buffer output circuit (132) includes：
5th resistance, has first end and a second end, the first end of the 5th resistance be coupled to the third transistor this
One end；
There is diode anode and cathode, the anode of the diode to receive the ground voltage and the cathode coupling of the diode
In the second end of the 5th resistance；
There is 4th transistor first end, second end and control terminal, the second end of the 4th transistor to receive the ground voltage,
And the 4th the control terminal of transistor be coupled to the second end of the 5th resistance；
There is 5th transistor first end, second end and control terminal, the second end of the 5th transistor to receive the ground voltage,
And the 5th the control terminal of transistor be coupled to the first end of the 4th transistor；
6th resistance, has first end and a second end, the first end of the 6th resistance receive the first system voltage and this
The second end of six resistance is coupled to the first end of the 4th transistor；
7th resistance, has first end and a second end, the first end of the 7th resistance receive the first system voltage and this
The second end of seven resistance is coupled to the first end of the 5th transistor；
8th resistance, has first end and a second end, the first end of the 8th resistance be coupled to the 7th resistance this second
End；
There is 6th transistor first end, second end and control terminal, the first end of the 6th transistor to receive the first system
The control terminal of voltage and the 6th transistor is coupled to the second end of the 8th resistance；And
9th resistance, has first end and a second end, the first end of the 9th resistance be coupled to the 6th transistor this
The second end of two ends and the 9th resistance is coupled to the leakage current detection circuit (120).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510102957.1A CN106033879B (en) | 2015-03-09 | 2015-03-09 | Breaking protection circuit |
| DE102015222451.1A DE102015222451A1 (en) | 2015-03-09 | 2015-11-13 | Protection circuit with power interruption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510102957.1A CN106033879B (en) | 2015-03-09 | 2015-03-09 | Breaking protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106033879A CN106033879A (en) | 2016-10-19 |
| CN106033879B true CN106033879B (en) | 2018-10-16 |
Family
ID=56801036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510102957.1A Active CN106033879B (en) | 2015-03-09 | 2015-03-09 | Breaking protection circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106033879B (en) |
| DE (1) | DE102015222451A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810841A (en) * | 2011-05-30 | 2012-12-05 | 西门子公司 | Residual current protective device and circuit breaker |
| CN103364628A (en) * | 2013-07-15 | 2013-10-23 | 长城电器集团有限公司 | Residual current signal conditioning circuit |
| CN104067496A (en) * | 2012-01-27 | 2014-09-24 | 大金工业株式会社 | Power conversion circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2740012B2 (en) * | 1989-08-04 | 1998-04-15 | 株式会社東芝 | Error compensated current transformer |
| US8102629B2 (en) * | 2009-03-12 | 2012-01-24 | Xerox Corporation | Leakage current compensation for high voltage transformers |
-
2015
- 2015-03-09 CN CN201510102957.1A patent/CN106033879B/en active Active
- 2015-11-13 DE DE102015222451.1A patent/DE102015222451A1/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810841A (en) * | 2011-05-30 | 2012-12-05 | 西门子公司 | Residual current protective device and circuit breaker |
| CN104067496A (en) * | 2012-01-27 | 2014-09-24 | 大金工业株式会社 | Power conversion circuit |
| CN103364628A (en) * | 2013-07-15 | 2013-10-23 | 长城电器集团有限公司 | Residual current signal conditioning circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102015222451A1 (en) | 2016-09-15 |
| CN106033879A (en) | 2016-10-19 |
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