CN207096322U - Power supply sample circuit and its low-voltage circuit breaker based on single electric current transformer - Google Patents
Power supply sample circuit and its low-voltage circuit breaker based on single electric current transformer Download PDFInfo
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- CN207096322U CN207096322U CN201721148768.9U CN201721148768U CN207096322U CN 207096322 U CN207096322 U CN 207096322U CN 201721148768 U CN201721148768 U CN 201721148768U CN 207096322 U CN207096322 U CN 207096322U
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Abstract
The utility model discloses a kind of power supply sample circuit based on single electric current transformer, including current transformer, rectification circuit, the first sample circuit, mu balanced circuit, A/D convertor circuit, control circuit, auxiliary power circuit, switching on-off circuit and the second sample circuit all the way；Current transformer output end is powered by rectification circuit and mu balanced circuit, auxiliary power circuit power supply；First sampling circuit samples rectification circuit output signal uploads control circuit by A/D convertor circuit, and the second sampling circuit samples switching on-off circuit output signal simultaneously uploads control circuit by A/D convertor circuit；Control circuit samples auxiliary power circuit signal and obtains bus sampled value.The invention also discloses the low-voltage circuit breaker for including the power supply sample circuit based on single electric current transformer.The utility model small volume, cost are low and measurement accuracy is high, measure and power supply effect is good.
Description
Technical field
The utility model is specifically related to a kind of power supply sample circuit and its low-voltage circuit breaker based on single electric current transformer.
Background technology
With the development and the improvement of people's living standards of national economy technology, electric energy has become the daily production of people
With secondary energy sources essential in life, production and life to people bring endless facility.
Low-voltage circuit breaker be it is a kind of can not only connect with disjunction normal duty electric current and overload electric current, can also connect
With the device for switching of disjunction short circuit current, it plays huge effect in power system.In low-voltage circuit breaker, it is powered
Two ways is typically used using circuit：First way is to use double-current transformer, one of current transformer conduct
Electric current authigenic power supply is powered for controller, and another current transformer is then made exclusively for the current transformer of current sample；But
Due to needing to use two current transformers, hence in so that the volume of low-voltage circuit breaker is larger, cost increase, it is difficult to apply small
In the low-voltage circuit breaker of size.The second way is then to use single electric current transformer (as shown in Figure 1), and the current transformer is not only
Supplied as electric current authigenic power supply, while also carry the effect of current sample；But because current sampling circuit is placed on power supply
Circuit rear end, therefore current sample low precision, can only gather amplitude, can not acquisition phase.
Therefore, if low-voltage circuit breaker needs to carry out electric parameter metering, traditional single electric current transformer mode can only carry out electricity
Flow measurement, power and electricity etc. can not be measured and adopt parameter, and current measurement precision is poor；And according to the side of double-current transformer
Formula, although the requirement of high precision electro parameter measurement can be met, also there is the shortcomings that double-current transformer volume is big, and cost is high.
Utility model content
One of the purpose of this utility model is to provide that a kind of small volume, cost are low and measurement accuracy is high, measurement and power supply
The good power supply sample circuit based on single electric current transformer of effect.
The two of the purpose of this utility model are that providing a kind of power supply based on single electric current transformer including described in samples electricity
The low-voltage circuit breaker on road.
This power supply sample circuit based on single electric current transformer provided by the utility model, including Current Mutual Inductance all the way
Device, rectification circuit, the first sample circuit, mu balanced circuit, A/D convertor circuit and control circuit, in addition to auxiliary power circuit, cut
Change on-off circuit and the second sample circuit；The output end of current transformer exports power supply by rectification circuit and mu balanced circuit
Signal, auxiliary power circuit equally export power supply signal；The output end of rectification circuit connects the first sample circuit, and first adopts
The out-put supply signal of sample circuit sampling rectification circuit uploads control circuit, the output end of current transformer by A/D convertor circuit
The second sample circuit is connected by switching on-off circuit, the out-put supply signal of the second sampling circuit samples switching on-off circuit is simultaneously
Control circuit is uploaded by A/D convertor circuit；Control circuit samples the out-put supply signal of auxiliary power circuit, and is turned according to AD
The sampled signal for changing circuit upload obtains sampled value.
The first described sample circuit is resistance sampling circuit.
Described rectification circuit is rectifier circuit.
Described auxiliary power circuit is DC voltage-stabilizing module or AC/DC power supply circuits.
Described switching on-off circuit includes first switch pipe and second switch pipe, first switch pipe and second switch pipe
Control terminal is connected to the output end of control circuit, the output end of movable end one end connection current transformer of first switch pipe simultaneously
One end, the other end of the output end of movable end one end connection current transformer of second switch pipe, the movable end of first switch pipe
The other end and the other end of movable end of second switch pipe be all connected with the second sample circuit.
The second described sample circuit is resistance sampling circuit.
Described mu balanced circuit includes voltage comparator, protection diode and stabilized switch pipe；One end of stabilized switch pipe
Connect the output end of rectification circuit, other end ground connection；The output end of rectification circuit exports power supply by protection diode and believed
Number, power supply signal connects the input of voltage comparator with reference power source signal, and the output end connection of voltage comparator is steady
Compress switch the control terminal of pipe.
Described first switch pipe, second switch pipe and stabilized switch pipe is triode or FET.
The utility model additionally provides a kind of low pressure including the power supply sample circuit based on single electric current transformer and broken
Road device.
This power supply sample circuit based on single electric current transformer provided by the utility model, passes through current transformer all the way
With the power supply of accessory power supply, and the voltage stabilizing power supply of mu balanced circuit and turning on and off for switching on-off circuit, ensure that auxiliary
Accurate, reliable bus power data information can be collected by helping during power supply normal work, and in auxiliary electric power supply work
The power supply reliability of late-class circuit can be ensured when making abnormal, therefore circuit small volume of the present utility model, cost are low and measure
Precision is high, measurement and power supply effect are good；Using the low-voltage circuit breaker of circuit of the present utility model, equally also there is circuit volume
Small, cost is low and the advantages of measurement accuracy is high, measurement and power supply effect are good.
Brief description of the drawings
Fig. 1 is the schematic diagram of the power supply sample circuit of prior art.
Fig. 2 is the functional block diagram of power supply sample circuit of the present utility model.
Fig. 3 is the circuit theory diagrams of power supply sample circuit of the present utility model.
Embodiment
It is illustrated in figure 2 the functional block diagram of power supply sample circuit of the present utility model：It is provided by the utility model this
Power supply sample circuit based on single electric current transformer, including current transformer, rectification circuit, the first sample circuit, voltage stabilizing all the way
Circuit, A/D convertor circuit, control circuit, auxiliary power circuit, switching on-off circuit and the second sample circuit；Current transformer
Output end exports power supply signal by rectification circuit and mu balanced circuit, and auxiliary power circuit equally exports power supply letter
Number；The output end of rectification circuit connects the first sample circuit, and the out-put supply signal for sampling rectification circuit passes through A/D convertor circuit
Control circuit is uploaded, the output end of current transformer connects the second sample circuit, the second sample circuit by switching on-off circuit
The out-put supply signal of sampling switching on-off circuit simultaneously uploads control circuit by A/D convertor circuit；Control circuit sampling auxiliary electricity
The out-put supply signal of source circuit, and the sampled signal uploaded according to A/D convertor circuit obtains sampled value.
It is illustrated in figure 3 the circuit theory diagrams of power supply sample circuit of the present utility model：Rectification circuit has rectifier bridge D1 structures
Into；Switching on-off circuit is made up of first switch pipe V1 and second switch pipe V2, the control of first switch pipe and second switch pipe
End is connected to the output end of control circuit, the output end one of movable end one end connection current transformer of first switch pipe simultaneously
End, the other end of the output end of movable end one end connection current transformer of second switch pipe, the movable end of first switch pipe
The other end of the movable end of the other end and second switch pipe is all connected with the second sample circuit, and the first sample circuit is made up of resistance R1
Resistance sampling circuit, the second sample circuit form the second sample circuit by resistance R2, and mu balanced circuit includes voltage comparator U1, protected
Protect diode D2 and stabilized switch pipe V3；The output end of one end connection rectification circuit of stabilized switch pipe, other end ground connection；Rectification
The output end of circuit exports power supply signal by protection diode, and power supply signal connects voltage with reference power source signal
The input of comparator, the control terminal of the output end connection stabilized switch pipe of voltage comparator.
The operation principle of above-mentioned power supply sample circuit is as follows：
1) when the auxiliary power circuit normal work of outside, i.e., energy is provided by auxiliary power circuit for power supply；
Control circuit detects auxiliary power circuit normal work, now control circuit control switching on-off circuit conducting；Current Mutual Inductance
The second sample circuit for switching switch, being made up of sampling resistor R2 that the current signal of device forms via metal-oxide-semiconductor V1 and V2 is formed
Current loop, current signal is converted to voltage signal and is sent into A/D convertor circuit by the sampling resistor R2 of the second sample circuit, by controlling
Circuit control A/D convertor circuit processed carries out analog-to-digital conversion to this signal.
Due to switching the conducting of on-off circuit, the secondary current of current transformer is directly adopted through switching switch to secondary signal
Sample circuit, and rectifier bridge D1 is no longer pass through, therefore the mu balanced circuit after rectifier bridge no longer works, its whole system power supply is by auxiliary
Power supply is helped to provide；Now, Current Transformer Secondary load is the sampling resistor of the second sample circuit, and its load impedance is very steady
It is fixed, thus the current signal quite stable that the second sample circuit collects, the alternating voltage letter changed out through the second sample circuit
Number it is high-precision ac voltage signal, the basis that this signal can calculate as high-precision current measurement, power calculation, electricity
Data-signal source.
Now, the sampled signal voltage U of A/D convertor circuit detection is U=I*N1/N2*R2, and wherein I is primary current value,
N1 is the current transformer primary side number of turn, and N2 is the current transformer secondary number of turn, and R2 is that the sampling resistor R2 of the second sample circuit hinders
Value.
2) when auxiliary power circuit operation irregularity, now control circuit detects auxiliary power circuit operation irregularity (ratio
Such as accessory power supply failure, or output voltage deficiency etc.) after, the V1 and V2 that switch on-off circuit are disconnected；Now the second sampling
Circuit no longer works；
At this point it is possible to it is divided into the following two kinds situation：
If protection diode D2 output end voltage is more than VREF, the output end of voltage comparator is high level, now
V3 is open-minded, and now the rectified bridge D1 of the current signal of current transformer, the V3 of mu balanced circuit, the first signal acquisition circuit R1 are formed
Signal circuit；The sampled resistance R1 of current signal of first sample circuit collection is converted to voltage signal and is sent into A/D convertor circuit,
A/D convertor circuit is controlled to carry out analog-to-digital conversion to this signal by control circuit；Simultaneously as V3 is turned on so that protection diode D2
Input be pulled low as low level, therefore now D2 output end will be pulled down to intimate low level rapidly so that protection
Diode D2 output end voltage is less than VREF；
And when protection diode D2 output end voltage is less than VREF, then the output end of voltage comparator is low level, this
When V3 end, then the first sample circuit collection the sampled resistance R1 of current signal be converted to voltage signal be sent into AD conversion electricity
Road, A/D convertor circuit is controlled to carry out analog-to-digital conversion to this signal by control circuit；And because V3 ends, therefore rectification circuit is defeated
Go out terminal voltage will rapid uplift to normal level；
Therefore, as long as choosing normal power supply level of the reference voltage VREF required by power supply, then described voltage stabilizing
Circuit, in auxiliary power supply circuit abnormality, the level signal of power supply can be maintained at basically by above-mentioned process
The left and right a small range concussion of VREF level；
In the above situation, the sampled resistance R1 of current signal of the first signal acquisition circuit collection is converted to voltage signal and sent
Enter A/D convertor circuit.A/D convertor circuit is controlled to carry out analog-to-digital conversion to this signal by control unit.
Due to current transformer the rectified bridge of output secondary singal, mu balanced circuit, the first sample circuit when, due to voltage stabilizing
The dynamic adjustment of circuit, makes the secondary side load impedance of current transformer change within the specific limits, therefore its secondary current is believed
Number it can produce corresponding distortion；Simultaneously as after the rectified bridge rectification of signal, AC signal negative half period is changed into positive half cycle, because
This first sample circuit collection signal be steamed bun ripple, can only detected amplitude, phase can not be detected, only can be as breaker
The electric current basic data signal source used required for current protecting function.
Now, sampled signal the voltage U=I*N1/N2*R1, wherein I of A/D convertor circuit detection are primary current value, and N1 is
The current transformer primary side number of turn, N2 are the current transformer secondary number of turn, and R1 is the sampling resistor R1 resistances of the first sample circuit.
This power supply sample circuit based on single electric current transformer provided by the utility model, it is applicable not only to low pressure open circuit
Device, it can also be used to other any need are powered the electronic equipment of sampling, including all types of measuring instruments (such as electric energy
Table, water meter, gas meter, flow meter, calorimeter etc.), electric energy management terminal, distribution terminal, electric energy quality monitoring equipment, grid automation it is whole
End, acquisition terminal, concentrator, data acquisition unit, measuring instrument, write by hand device, fault detector etc..
Claims (8)
1. a kind of power supply sample circuit based on single electric current transformer, including current transformer, rectification circuit, the first sampling all the way
Circuit, mu balanced circuit, A/D convertor circuit and control circuit, it is characterised in that also including auxiliary power circuit, switching on-off circuit
With the second sample circuit；The output end of current transformer exports power supply signal, auxiliary by rectification circuit and mu balanced circuit
Power circuit equally exports power supply signal；The output end of rectification circuit connects the first sample circuit, and the first sample circuit is adopted
The out-put supply signal of sample rectification circuit uploads control circuit by A/D convertor circuit, and the output end of current transformer passes through switching
On-off circuit connects the second sample circuit, and the out-put supply signal of the second sampling circuit samples switching on-off circuit is simultaneously turned by AD
Change circuit and upload control circuit；Control circuit samples the out-put supply signal of auxiliary power circuit, and according on A/D convertor circuit
The sampled signal of biography obtains sampled value.
2. the power supply sample circuit according to claim 1 based on single electric current transformer, it is characterised in that described first
Sample circuit is resistance sampling circuit.
3. the power supply sample circuit according to claim 1 based on single electric current transformer, it is characterised in that described rectification
Circuit is rectifier circuit.
4. the power supply sample circuit according to claim 1 based on single electric current transformer, it is characterised in that described auxiliary
Power circuit is DC voltage-stabilizing module or AC/DC power supply circuits.
5. the power supply sample circuit based on single electric current transformer according to one of Claims 1 to 4, it is characterised in that described
Switching on-off circuit include first switch pipe and second switch pipe, the control terminal of first switch pipe and second switch pipe connects simultaneously
The output end of control circuit is connected to, output end one end of movable end one end connection current transformer of first switch pipe, second opens
Close the other end of the output end of movable end one end connection current transformer of pipe, the other end of the movable end of first switch pipe and the
The other end of the movable end of two switching tubes is all connected with the second sample circuit.
6. the power supply sample circuit based on single electric current transformer according to one of Claims 1 to 4, it is characterised in that described
The second sample circuit be resistance sampling circuit.
7. the power supply sample circuit based on single electric current transformer according to one of Claims 1 to 4, it is characterised in that described
Mu balanced circuit include voltage comparator, protection diode and stabilized switch pipe；One end connection rectification circuit of stabilized switch pipe
Output end, the other end ground connection；The output end of rectification circuit exports power supply signal, power supply letter by protection diode
The input of voltage comparator, the control of the output end connection stabilized switch pipe of voltage comparator number are connected with reference power source signal
End.
8. a kind of low-voltage circuit breaker, it is characterised in that including the confession based on single electric current transformer described in one of claim 1~7
Electric sample circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721148768.9U CN207096322U (en) | 2017-09-08 | 2017-09-08 | Power supply sample circuit and its low-voltage circuit breaker based on single electric current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721148768.9U CN207096322U (en) | 2017-09-08 | 2017-09-08 | Power supply sample circuit and its low-voltage circuit breaker based on single electric current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207096322U true CN207096322U (en) | 2018-03-13 |
Family
ID=61539494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721148768.9U Withdrawn - After Issue CN207096322U (en) | 2017-09-08 | 2017-09-08 | Power supply sample circuit and its low-voltage circuit breaker based on single electric current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207096322U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402324A (en) * | 2017-09-08 | 2017-11-28 | 威胜电气有限公司 | Power supply sample circuit, method and its low-voltage circuit breaker based on single electric current transformer |
| CN112951670A (en) * | 2019-12-10 | 2021-06-11 | 华为数字技术（苏州）有限公司 | Circuit breaker with current detection function and communication power supply |
-
2017
- 2017-09-08 CN CN201721148768.9U patent/CN207096322U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402324A (en) * | 2017-09-08 | 2017-11-28 | 威胜电气有限公司 | Power supply sample circuit, method and its low-voltage circuit breaker based on single electric current transformer |
| CN107402324B (en) * | 2017-09-08 | 2023-08-15 | 威胜能源技术股份有限公司 | Power supply sampling circuit and method based on single current transformer and low-voltage circuit breaker thereof |
| CN112951670A (en) * | 2019-12-10 | 2021-06-11 | 华为数字技术（苏州）有限公司 | Circuit breaker with current detection function and communication power supply |
| CN112951670B (en) * | 2019-12-10 | 2024-05-17 | 华为数字能源技术有限公司 | Circuit breaker with current detection function and communication power supply |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 411201 28 Bai Shi Road, Jing Kai District, Xiangtan, Hunan Patentee after: Weisheng Energy Technology Co.,Ltd. Address before: 411201 No. 28 Baishi Road, Economic Development Zone, Xiangtan City, Hunan Province Patentee before: WASION ELECTRIC Co.,Ltd. |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180313 Effective date of abandoning: 20230815 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180313 Effective date of abandoning: 20230815 |