CN107422179A - New power supply sample circuit, the power supply method of sampling and its low-voltage circuit breaker - Google Patents
New power supply sample circuit, the power supply method of sampling and its low-voltage circuit breaker Download PDFInfo
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- CN107422179A CN107422179A CN201710806564.8A CN201710806564A CN107422179A CN 107422179 A CN107422179 A CN 107422179A CN 201710806564 A CN201710806564 A CN 201710806564A CN 107422179 A CN107422179 A CN 107422179A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
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- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a kind of new power supply sample circuit, including current transformer, rectification circuit, A/D convertor circuit, control circuit, signal sample circuit, mu balanced circuit and auxiliary power circuit all the way；Current transformer exports power supply by rectification circuit and mu balanced circuit；Auxiliary power circuit exports power supply；Signal sample circuit samples rectification circuit signal and uploads control circuit by A/D convertor circuit；Control circuit obtains sampled value according to the sampled signal of upload, detects working condition and the output control signal control mu balanced circuit work of auxiliary power circuit.Present invention also offers the power supply method of sampling of the new power supply sample circuit.Present invention also offers the low-voltage circuit breaker including the new power supply sample circuit and the power supply method of sampling.Small volume of the present invention, cost is low, measurement accuracy is high and power supply and measurement are reliable.
Description
Technical field
Present invention relates particularly to a kind of new power supply sample circuit, the power supply method of sampling and its low-voltage circuit breaker.
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, and the current transformer serves not only as electric current certainly
Raw power supply supplies, while also carries the effect of current sample；But because current sampling circuit is placed on power supply circuit rear end, because
This 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.
The content of the invention
An object of the present invention is to provide that a kind of small volume, cost are low, measurement accuracy is high and power supply and measurement are reliable
New power supply sample circuit.
The second object of the present invention is to provide a kind of power supply method of sampling of the new power supply sample circuit.
The third object of the present invention is to provide a kind of including the new power supply sample circuit and the power supply method of sampling
Low-voltage circuit breaker.
This new power supply sample circuit provided by the invention, including current transformer, rectification circuit, AD conversion electricity all the way
Road and control circuit, in addition to signal sample circuit, mu balanced circuit and auxiliary power circuit；The output end of current transformer passes through
Rectification circuit DC power output, by exporting power supply after mu balanced circuit voltage stabilizing；The output end connection of auxiliary power circuit
The output end of mu balanced circuit simultaneously exports power supply；The output electric power signal of signal sample circuit sampling rectification circuit simultaneously passes through AD
Change-over circuit uploads control circuit；Control circuit is used to obtain sampled value according to the sampled signal of upload, is also used for detection auxiliary
Working condition and output control signal the control mu balanced circuit work of power circuit.
Described auxiliary power circuit is DC voltage-stabilizing module or AC/DC power supply circuits.
Described rectification circuit is rectifier bridge.
Described signal sample circuit includes two-way sampling resistor；First via sampling resistor is connected to a bridge of rectifier bridge
On arm, the second road sampling resistor is connected on another bridge arm of rectifier bridge；The signal sample circuit is used to sample rectified current
The power supply signal of the output end on road.
Described mu balanced circuit includes voltage comparator, protection diode, output diode and stabilized switch pipe；Voltage stabilizing is opened
Close the output end of one end connection rectification circuit of pipe, other end ground connection；The output end of rectification circuit is exported by protection diode
Power supply signal, power supply signal connect the input of voltage comparator with reference power source signal, voltage comparator it is defeated
Go out the control terminal of end connection stabilized switch pipe, the control signal of control circuit output connects power supply by output diode and believed
Number.
Described stabilized switch pipe is triode or FET.
Present invention also offers the power supply method of sampling of the new power supply sample circuit, comprise the following steps：
S1. system electrification and completion is initialized；
S2. current transformer passes through rectification circuit and mu balanced circuit output power supply according to bus current output current signal
Power supply signal, at the same on accessory power supply electricity and export power supply signal, both provide power supply signal for late-class circuit jointly；
S3. the out-put supply signal of control unit detection accessory power supply, and judge the working condition of accessory power supply；
S4. according to the working condition of the obtained accessory power supplys of step S3, sampled using following rule：
If accessory power supply is working properly, the control signal for connecting mu balanced circuit is set to high level by control unit；Simultaneously
Control unit obtains the sampled signal that signal sample circuit is uploaded by A/D convertor circuit and obtains corresponding sampled value, so as to complete
Into the collection of bus power supply signal；
If accessory power supply operation irregularity, the control signal for connecting mu balanced circuit is set to low level by control unit；Meanwhile
Control unit obtains the sampled signal that signal sample circuit is uploaded by A/D convertor circuit and obtains corresponding sampled value, and will
The sampled value arrived is only used as electric current basic data；
If S5. accessory power supply operation irregularity, mu balanced circuit is by the output signal voltage stabilizing of rectification circuit in reference power source electricity
It is flat, ensure the power supply supply of late-class circuit.
Present invention also offers the low-voltage circuit breaker including the new power supply sample circuit and the power supply method of sampling.
This new power supply sample circuit provided by the invention and the power supply method of sampling, control circuit pass through signal sampling electricity
The information of the out-put supply signal of road sampling current transformer, while controlled according to the working condition of detection auxiliary power circuit
The running status of mu balanced circuit finally also ensure that system supplies so as to judge the effect of the sample information of acquisition by mu balanced circuit
The reliability of power supply, therefore this new power supply sample circuit provided by the invention and the power supply method of sampling, only with all the way
Current transformer, small volume and cost is low；Measurement accuracy is high simultaneously, and powers and measure and be reliable.Meanwhile using the present invention
The new power supply sample circuit and the low-voltage circuit breaker of the power supply method of sampling provided, similarly with small volume, cost is low and pacifies
The advantages of complete reliable.
Brief description of the drawings
Fig. 1 is the functional block diagram of circuit of the present invention.
Fig. 2 is the circuit theory diagrams of circuit of the present invention.
Fig. 3 is the method flow diagram of the inventive method.
Embodiment
It is the functional block diagram of circuit of the present invention as shown in Figure 1：This new power supply sample circuit provided by the invention, bag
Include current transformer, rectification circuit, A/D convertor circuit, control circuit, signal sample circuit, mu balanced circuit and accessory power supply all the way
Circuit；The output end of current transformer is by rectification circuit DC power output, by exporting power supply electricity after mu balanced circuit voltage stabilizing
Source；The output end of the output end connection mu balanced circuit of auxiliary power circuit simultaneously exports power supply；Signal sample circuit sampling is whole
The output electric power signal of current circuit simultaneously uploads control circuit by A/D convertor circuit；Control circuit is used to be believed according to the sampling of upload
Number obtain sampled value, be also used for detect auxiliary power circuit working condition and output control signal control mu balanced circuit work.
It is illustrated in figure 2 the circuit theory diagrams of circuit of the present invention：Rectification circuit is the rectifier bridge being made up of D1~D4 in figure；
Signal sample circuit includes the first sampling resistor R1 and the second sampling resistor R2, and the one of the first sample circuit R1 connection rectifier bridges
Individual bridge arm, another bridge arm of the second sampling resistor R2 connection rectifier bridges；Signal (that is, rectifier bridge on rectifier bridge on bridge arm
Output signal) pass through signal sample circuit and A/D convertor circuit upload control circuit；Mu balanced circuit includes voltage comparator U1, protected
Protect diode D5, output diode D6 and stabilized switch pipe V1；The output end of one end connection rectification circuit of stabilized switch pipe, separately
One end is grounded；The output end of rectification circuit exports power supply signal, power supply signal and reference electricity by protection diode
Source signal connects the input of voltage comparator, the control terminal of the output end connection stabilized switch pipe of voltage comparator, control electricity
The control signal of road output connects power supply signal by output diode.
The operation principle of above-mentioned power supply sample circuit is as follows：
1) auxiliary power circuit normal work：Control circuit detects accessory power supply normal work, and now control circuit is defeated
The control signal gone out to mu balanced circuit is high level (ensuring that the level value of the high level is more than VREF), now in mu balanced circuit
Metal-oxide-semiconductor V1 is in the conduction state, and the output end of current transformer is directly grounded by metal-oxide-semiconductor V1, now on diode D5 almost
No current flows through, and now standing alone as subsequent conditioning circuit by auxiliary power circuit provides power supply；Meanwhile now due to Current Mutual Inductance
The output electric energy of device is only by rectification circuit and metal-oxide-semiconductor V1 ground connection (negative pole for returning to rectifier bridge), now current transformer
Load impedance is highly stable；So the current signal quite stable that signal sample circuit collects, its alternating voltage changed out
Signal is high-precision ac voltage signal, the base that this signal can calculate as high-precision current measurement, power calculation, electricity
Plinth data-signal source.
Risen with current transformer Same Name of Ends, it is the diode D1 of the rectified bridge of electric current, steady when AC signal is in positive half cycle
The metal-oxide-semiconductor V1 of volt circuit, the sampling resistor R2 of signal acquisition circuit, rectifier bridge diode D4 form loop.Now, adopted in signal
The positive half cycle waveform voltage signal of ac current signal is formed on the sampling resistor R2 of collector.
When AC signal is in negative half period, the diode D2 of the rectified bridge of electric current, the metal-oxide-semiconductor V1 of mu balanced circuit, signal
The sampling resistor R1 of Acquisition Circuit, rectifier bridge diode D3 form loop.Now, on the sampling resistor R1 of signal acquisition circuit
Form the negative half period waveform voltage signal of ac current signal.
The AD conversion chip of A/D convertor circuit is Differential Input form, therefore, when caused negative half period sampled signal on R1
With when caused positive half cycle sampled signal enters the AD conversion chip of Differential Input on R2, received by its a/d converter is one
Individual complete ac voltage signal waveform, its voltage magnitude U is U=I*N1/N2*R, and wherein I is primary current value, and N1 is electric current
The transformer primary side number of turn, N2 are the current transformer secondary number of turn, and R is sampling resistor R1, R2 resistance；To ensure that differential signal is consistent
Property, it is desirable to sampling resistor R1 and the R2 resistance of signal acquisition circuit is equal.
2) auxiliary power circuit operation irregularity：After now control circuit detects that accessory power supply is abnormal, control circuit is not
(i.e. corresponding control signal level is set to low level) is controlled to mu balanced circuit, now mu balanced circuit passes through U1 pairs of comparator
Step voltage and reference voltage REF are compared afterwards, then by controlling metal-oxide-semiconductor V1 turn-on and turn-off, output voltage stabilization is existed
In certain limit, and this voltage regulation signal feed system power supply is used.
At this point it is possible to it is divided into the following two kinds situation：
If protection diode D5 output end voltage is more than VREF, the output end of voltage comparator is high level, now
V1 is open-minded, and now the V1 of the rectified bridge of the current signal of current transformer and mu balanced circuit forms signal circuit；Signal sampling electricity
The sampled resistance of current signal of road collection is converted to voltage signal and is sent into A/D convertor circuit, and AD conversion electricity is controlled by control circuit
Road carries out analog-to-digital conversion to this signal；Simultaneously as V1 is turned on so that protection diode D5 input is pulled low as low electricity
It is flat, therefore now D5 output end will be pulled down to intimate low level rapidly so that protection diode D5 output end voltage
Less than VREF；
And when protection diode D5 output end voltage is less than VREF, then the output end of voltage comparator is low level, this
When V1 end；And because V1 ends, now current transformer still normal work, therefore the output end voltage of rectification circuit will
Rapid uplift is 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；
Now the sampling resistor R1 and R2 of signal sample circuit still can normal acquisition to current signal and be transferred to AD turn
Change circuit；But due to the dynamic corrective action of mu balanced circuit, the output load impedance of current transformer is set to be in certain limit
Dynamic change state under；Therefore, the signal can produce slight distortion, can not meet the requirement of high-acruracy survey and metering, but
Can be as the electric current basic data signal source used required for the current protecting function of breaker.
It is illustrated in figure 3 the method flow diagram of the inventive method：This new power supply sampling electricity provided by the invention
The power supply method of sampling on road, comprises the following steps：
S1. system electrification and completion is initialized；
S2. current transformer passes through rectification circuit and mu balanced circuit output power supply according to bus current output current signal
Power supply signal, at the same on accessory power supply electricity and export power supply signal, both provide power supply signal for late-class circuit jointly；
S3. the out-put supply signal of control unit detection accessory power supply, and judge the working condition of accessory power supply；
S4. according to the working condition of the obtained accessory power supplys of step S3, sampled using following rule：
If accessory power supply is working properly, the control signal for connecting mu balanced circuit is set to high level by control unit；Simultaneously
Control unit obtains the sampled signal that signal sample circuit is uploaded by A/D convertor circuit and obtains corresponding sampled value, so as to complete
Into the collection of bus power supply signal；
If accessory power supply operation irregularity, the control signal for connecting mu balanced circuit is set to low level by control unit；Meanwhile
Control unit obtains the sampled signal that signal sample circuit is uploaded by A/D convertor circuit and obtains corresponding sampled value, and will
The sampled value arrived is only used as electric current basic data；
If S5. accessory power supply operation irregularity, mu balanced circuit is by the output signal voltage stabilizing of rectification circuit in reference power source electricity
It is flat, ensure the power supply supply of late-class circuit.
This power supply sample circuit provided by the invention and the power supply method of sampling, are applicable not only to low-voltage circuit breaker, also may be used
Be powered the electronic equipment of sampling for other any need, including all types of measuring instruments (such as electric energy meter, water meter,
Gas meter, flow meter, calorimeter etc.), electric energy management terminal, distribution terminal, electric energy quality monitoring equipment, grid automation terminal, collection eventually
End, concentrator, data acquisition unit, measuring instrument, write by hand device, fault detector etc..
Claims (8)
1. a kind of new power supply sample circuit, including current transformer, rectification circuit, A/D convertor circuit and control circuit all the way,
Characterized by further comprising signal sample circuit, mu balanced circuit and auxiliary power circuit；The output end of current transformer passes through whole
Current circuit DC power output, by exporting power supply after mu balanced circuit voltage stabilizing；The output end connection of auxiliary power circuit is steady
The output end of volt circuit simultaneously exports power supply；The output electric power signal of signal sample circuit sampling rectification circuit is simultaneously turned by AD
Change circuit and upload control circuit；Control circuit is used to obtain sampled value according to the sampled signal of upload, is also used for detection auxiliary electricity
Working condition and output control signal the control mu balanced circuit work of source circuit.
2. new power supply sample circuit according to claim 1, it is characterised in that described auxiliary power circuit is direct current
Voltage stabilizing module or AC/DC power supply circuits.
3. new power supply sample circuit according to claim 1, it is characterised in that described rectification circuit is rectifier bridge.
4. new power supply sample circuit according to claim 3, it is characterised in that described signal sample circuit includes two
Road sampling resistor；First via sampling resistor is connected on a bridge arm of rectifier bridge, and the second road sampling resistor is connected to rectifier bridge
Another bridge arm on；The signal sample circuit is used for the power supply signal for sampling the output end of rectification circuit.
5. the new power supply sample circuit according to one of Claims 1 to 4, it is characterised in that described mu balanced circuit includes
Voltage comparator, protection diode, output diode and stabilized switch pipe；One end of stabilized switch pipe connects the defeated of rectification circuit
Go out end, other end ground connection；The output end of rectification circuit by protection diode export power supply signal, power supply signal and
Reference power source signal connects the input of voltage comparator, and the output end of voltage comparator connects the control terminal of stabilized switch pipe,
The control signal of control circuit output connects power supply signal by output diode.
6. new power supply sample circuit according to claim 5, it is characterised in that described stabilized switch pipe is triode
Or FET.
7. the power supply method of sampling of the new power supply sample circuit described in a kind of one of claim 1~6, comprises the following steps：
S1. system electrification and completion is initialized；
S2. current transformer exports power supply according to bus current output current signal by rectification circuit and mu balanced circuit
Signal, at the same on accessory power supply electricity and export power supply signal, both provide power supply signal for late-class circuit jointly；
S3. the out-put supply signal of control unit detection accessory power supply, and judge the working condition of accessory power supply；
S4. according to the working condition of the obtained accessory power supplys of step S3, sampled using following rule：
If accessory power supply is working properly, the control signal for connecting mu balanced circuit is set to high level by control unit；Control simultaneously
Unit obtains the sampled signal that signal sample circuit is uploaded by A/D convertor circuit and obtains corresponding sampled value, so as to complete mother
The collection of line power supply signal；
If accessory power supply operation irregularity, the control signal for connecting mu balanced circuit is set to low level by control unit；Meanwhile control
Unit obtains the sampled signal that is uploaded by A/D convertor circuit of signal sample circuit and obtains corresponding sampled value, and will obtain
Sampled value is only used as electric current basic data；
If S5. accessory power supply operation irregularity, mu balanced circuit is by the output signal voltage stabilizing of rectification circuit in reference power source level, guarantor
Demonstrate,prove the power supply supply of late-class circuit.
A kind of 8. low-voltage circuit breaker, it is characterised in that including the new power supply sample circuit described in one of claim 1~6, and
The power supply method of sampling described in claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710806564.8A CN107422179A (en) | 2017-09-08 | 2017-09-08 | New power supply sample circuit, the power supply method of sampling and its low-voltage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710806564.8A CN107422179A (en) | 2017-09-08 | 2017-09-08 | New power supply sample circuit, the power supply method of sampling and its low-voltage circuit breaker |
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| Publication Number | Publication Date |
|---|---|
| CN107422179A true CN107422179A (en) | 2017-12-01 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710806564.8A Pending CN107422179A (en) | 2017-09-08 | 2017-09-08 | New power supply sample circuit, the power supply method of sampling and its low-voltage circuit breaker |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108508322A (en) * | 2018-04-11 | 2018-09-07 | 威胜信息技术股份有限公司 | Power supply sample circuit, the power supply method of sampling and its manufactured fault detector |
| CN109581112A (en) * | 2018-12-10 | 2019-04-05 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of converter valve TCU unit testing platform and TCU energize loop fault measurement method |
| CN110187165A (en) * | 2019-07-08 | 2019-08-30 | 西安创特电气科技有限公司 | A kind of single current transformer takes can be with sample circuit and control method |
| CN110212787A (en) * | 2019-07-05 | 2019-09-06 | 北京惠信金科信息技术有限公司 | The power supply circuit and method of power measuring system based on current transformer |
| CN111158419A (en) * | 2020-01-13 | 2020-05-15 | 维沃移动通信有限公司 | Power supply circuit, current acquisition method and electronic equipment |
| CN113078812A (en) * | 2021-03-18 | 2021-07-06 | 浙江聚创智能科技有限公司 | Current transformer sampling power-taking self-switching circuit |
| CN113075607B (en) * | 2021-03-18 | 2022-04-22 | 浙江聚创智能科技有限公司 | Metering type mutual inductor self-power-taking type measuring circuit in electronic circuit breaker |
| CN109581112B (en) * | 2018-12-10 | 2024-05-31 | 中国南方电网有限责任公司超高压输电公司柳州局 | Converter valve TCU unit test platform and TCU energy supply loop fault measurement method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108508322A (en) * | 2018-04-11 | 2018-09-07 | 威胜信息技术股份有限公司 | Power supply sample circuit, the power supply method of sampling and its manufactured fault detector |
| CN108508322B (en) * | 2018-04-11 | 2024-02-27 | 威胜信息技术股份有限公司 | Power supply sampling circuit, power supply sampling method and fault indicator manufactured by same |
| CN109581112A (en) * | 2018-12-10 | 2019-04-05 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of converter valve TCU unit testing platform and TCU energize loop fault measurement method |
| CN109581112B (en) * | 2018-12-10 | 2024-05-31 | 中国南方电网有限责任公司超高压输电公司柳州局 | Converter valve TCU unit test platform and TCU energy supply loop fault measurement method |
| CN110212787A (en) * | 2019-07-05 | 2019-09-06 | 北京惠信金科信息技术有限公司 | The power supply circuit and method of power measuring system based on current transformer |
| CN110187165A (en) * | 2019-07-08 | 2019-08-30 | 西安创特电气科技有限公司 | A kind of single current transformer takes can be with sample circuit and control method |
| CN110187165B (en) * | 2019-07-08 | 2024-05-14 | 西安创特电气科技有限公司 | Energy taking and sampling circuit of single current transformer and control method |
| CN111158419A (en) * | 2020-01-13 | 2020-05-15 | 维沃移动通信有限公司 | Power supply circuit, current acquisition method and electronic equipment |
| CN111158419B (en) * | 2020-01-13 | 2022-02-01 | 维沃移动通信有限公司 | Power supply circuit, current acquisition method and electronic equipment |
| CN113078812A (en) * | 2021-03-18 | 2021-07-06 | 浙江聚创智能科技有限公司 | Current transformer sampling power-taking self-switching circuit |
| CN113075607B (en) * | 2021-03-18 | 2022-04-22 | 浙江聚创智能科技有限公司 | Metering type mutual inductor self-power-taking type measuring circuit in electronic circuit breaker |
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