CN108508322A - Power supply sample circuit, the power supply method of sampling and its manufactured fault detector - Google Patents
Power supply sample circuit, the power supply method of sampling and its manufactured fault detector Download PDFInfo
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- CN108508322A CN108508322A CN201810322717.6A CN201810322717A CN108508322A CN 108508322 A CN108508322 A CN 108508322A CN 201810322717 A CN201810322717 A CN 201810322717A CN 108508322 A CN108508322 A CN 108508322A
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- 238000005070 sampling Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 21
- 230000005611 electricity Effects 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 3
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- 238000001914 filtration Methods 0.000 description 2
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- 239000003381 stabilizer Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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
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Abstract
The invention discloses a kind of power supply sample circuits, including current transformer, rectification module, Voltage stabilizing module, sampling module, subtraction circuit module and supercircuit module；The input terminal of current transformer connects power grid, and output end exports sampled data by rectification module and Voltage stabilizing module output power supply electric energy, second road signal by being divided into two paths of signals, first via signal after sampling module by subtraction circuit module and supercircuit module.The invention also discloses the power supply method of samplings of the power supply sample circuit, including current transformer to obtain signal；To signal sampling and it is divided into two-way；First via signal externally provides power supply signal by rectifier bridge module and Voltage stabilizing module；Second road signal obtains final electric system electric energy sampling signal by subtraction circuit module and supercircuit module.The invention also discloses the fault detectors including the power supply sample circuit and the method for sampling of powering.The present invention is only with a current transformer, and of low cost, reliability is high.
Description
Technical field
Present invention relates particularly to a kind of power supply sample circuit, the power supply method of sampling and its manufactured fault detectors.
Background technology
With the development and the improvement of people's living standards of national economy technology, electric energy has become people's production and life
Essential secondary energy sources in work, endless facility is brought to the production and life of people.
In the power system, a large amount of equipment (such as fault detector etc.) be required to carry out taking simultaneously in power grid electricity and
Sampling：The purpose that electricity is taken in power grid is to obtain itself required electric energy, to ensure that the operation energy of equipment itself carries
For；And the purpose sampled to the electric power signal of power grid is then to obtain the real-time data signal of electric energy in power grid, to right
The power quality etc. of power grid is monitored.
Currently, equipment carries out taking in power grid the technical solution of electricity and sampling, it is generally adopted by double CT (Current Mutual Inductances
Device) sampling mode carry out：For one of CT for taking electricity from electric system and providing power supply supply, another CT is then used for electricity
The sampling of net electric power signal.But the mode of double CT samplings, Material Cost is not only increased, and also have to the design of structure
It is required that and take electric CT with load variation can to sample CT magnetic circuit have an impact, cause sampling distortion.
Invention content
One of the objects of the present invention is to provide a kind of of low cost and can be carried out only with a current transformer
Take the power supply sample circuit of electricity and sampling.
The second object of the present invention is to provide a kind of power supply method of sampling of the power supply sample circuit.
The third object of the present invention is to provide a kind of failure including the power supply sample circuit and the method for sampling of powering
Indicator.
This power supply sample circuit provided by the invention, including current transformer, rectification module, Voltage stabilizing module, sampling mould
Block, subtraction circuit module and supercircuit module；The input terminal of current transformer connects power grid, the output end of current transformer with
Sampling module, rectification module and Voltage stabilizing module are sequentially connected in series, at the same the output end of sampling module also with subtraction circuit module, be superimposed
Circuit module is sequentially connected in series；The output end of current transformer is divided into two paths of signals, first via signal after being sampled by sampling module
By rectification module and Voltage stabilizing module output power supply electric energy, second road signal is defeated by subtraction circuit module and supercircuit module
Go out the electric power signal sampled data of power grid.
It is serially connected with protection module between the rectification module and Voltage stabilizing module；Protection module is used to provide Voltage stabilizing module
Electric protection.
The sampling module is resistance sampling circuit.
The rectification module is full-bridge rectification module.
The full-bridge rectification module is the full-bridge rectification module being made of four diodes.
The output end of the current transformer is sequentially connected in series with sampling module, rectification module, specially current transformer
Output end one end export the first signal, the first signal after concatenated sampling resistor by exporting second signal；Current transformer
The 4th diode of output end other end connection full-bridge rectification module cathode, the plus earth of the 4th diode；Second signal
The cathode of the second diode of anode and full-bridge rectification module of the first diode of full-bridge rectification module is connected simultaneously；Full-bridge rectification mould
The plus earth of the second diode of block；The cathode of the first diode of full-bridge rectification module is the output end of full-bridge rectification module, together
When also connect the cathode of full-bridge rectification module third diode, the anode of full-bridge rectification module third diode connects full-bridge rectification
The cathode of the 4th diode of module.
The supercircuit module is the add circuit being made of operational amplifier.
The subtraction circuit module is the subtraction circuit being made of operational amplifier.
The present invention also provides the power supply method of samplings of the power supply sample circuit, include the following steps：
S1. current transformer incudes from electric system and obtains electric power signal；
S2. the obtained electric power signals of step S1 are sampled, and sampled signal is divided into two-way；
S3. the first via sampled signal that step S2 is obtained after rectifier bridge module rectification by obtaining direct current energy, then passes through
Voltage stabilizing module externally provides stable power supply signal；
S4. it after the second tunnel sampled signal that step S2 is obtained passes sequentially through subtraction circuit module and supercircuit module, obtains
To final electric system electric energy sampling signal, and device provides basic sampled signal in order to control.
The invention also discloses a kind of fault detector, the fault detector includes above-mentioned power supply sample circuit and confession
The electric method of sampling.
This power supply sample circuit provided by the invention and the power supply method of sampling, can be real only with a current transformer
Electricity and sampling now are taken to electric system, power supply supply can not only be provided for subsequent equipment, also can be subsequent equipment
The sampled data information on basis is provided, and the present invention, only with a current transformer, of low cost, reliability is high.
Description of the drawings
Fig. 1 is the functional block diagram of the power supply sample circuit of the present invention.
Fig. 2 is the circuit diagram of the power supply sample circuit of the present invention.
Fig. 3 is the method flow diagram of the power supply method of sampling of the present invention.
Specific implementation mode
It is as shown in Figure 1 the functional block diagram of the power supply sample circuit of the present invention：This power supply sampling provided by the invention
Circuit, including current transformer, rectification module, protection module, Voltage stabilizing module, sampling module, subtraction circuit module and superposition electricity
Road module；The input terminal of current transformer connects power grid, output end and sampling module, rectification module, the protection of current transformer
Module and Voltage stabilizing module are sequentially connected in series, at the same the output end of sampling module also with subtraction circuit module, supercircuit module successively
Series connection；The output end of current transformer is divided into two paths of signals after being sampled by sampling module, first via signal by rectification module,
Protection module and Voltage stabilizing module output power supply electric energy, second road signal export electricity by subtraction circuit module and supercircuit module
The electric power signal sampled data of net.
Wherein, current transformer is used to obtain required electric energy from electric system；Sampling module is used for Current Mutual Inductance
The electric energy that device obtains is sampled；Rectification module is used to carry out rectification to the electric energy after sampling, is then carried out by protection module
The voltage-stabilizing protection of output end, then be input to Voltage stabilizing module and export final stabilized power source signal supplying power for outside；And subtraction circuit is then
Signal for exporting sampling module carries out subtraction, then the signal after subtraction is being superimposed with reference voltage signal
Circuit module carries out additional calculation, final useful to obtain, the electric system that can be directly used by controller module
Basic sample information data.
It is illustrated in figure 2 the circuit diagram of the power supply sample circuit of the present invention：In figure, 1 foot of XS6 and 2 feet connection electricity
The output end both ends of current transformer；Wherein RV4 is the varistor with protective effect, and resistance R5 is that sampling module (adopt by resistance
Sample circuit), sig1 (the first signal) and sig2 (second signal) are the two paths of signals of sampling module output；Diode V25 is (complete
The first diode of bridge rectification module), diode V26 (the second diode of full-bridge rectification module), diode V19 (full-bridge rectification moulds
Block third diode) and diode V20 (the 4th diode of full-bridge rectification module) composition full-bridge rectification modules, zener diode V2
Protection circuit is constituted with V13；Chip U10 is LDO chips (Voltage stabilizing module)；Voltage chips on the basis of chip U9；Chip U26 is
The negative supply power supply circuit that is made of amplifier simultaneously provides negative power signal for amplifier U17；Amplifier U17, capacitance C54, resistance
R148, R121, R143 and R147 constitute subtraction circuit module；Amplifier U27, resistance R233, R149, R151 and R152 constitute addition
Device circuit.
Output end one end of current transformer exports the first signal sig1, and the first signal passes through concatenated sampling resistor R5
Output second signal sig2 afterwards；The moon of the 4th diode V20 of output end other end connection full-bridge rectification module of current transformer
Pole, the plus earth of the 4th diode V20；Second signal simultaneously connect the first diode of full-bridge rectification module V25 anode and
The cathode of the second diode of full-bridge rectification module V26；The plus earth of the second diode of full-bridge rectification module V26；Full-bridge rectification
The cathode of the first diode of module V25 is the output end of full-bridge rectification module, while also the three or two pole of connection full-bridge rectification module
The cathode of pipe V19, the moon of the 4th diode V20 of anode connection full-bridge rectification module of full-bridge rectification module third diode V19
Pole；
After first signal is divided by divider resistance R52 and R53, amplifier U17 is being inputted just by resistance R143
Pole, and after second signal is then divided by resistance R48 and R51, the cathode of amplifier U17, amplifier U17 are input to by resistance R121
Anode be also grounded by pull down resistor R147, and the cathode of amplifier U17 also connects the output end of itself by resistance R148；
Amplifier U17 also has negative signal input, therefore amplifier U17 also obtains negative supply letter by amplifier U26 due to there is positive signal input
Number；The anode of amplifier U26 connects the positive feeder ear of itself by capacitance C12, and the cathode feeder ear of amplifier U26 then connects
The power supply signal of LDO chips output, due to the input/output characteristic of amplifier, it is known that amplifier U26 is under the connection of this circuit
Its 1 foot of output end should be negative power signal；And the letter of the subtraction circuit module output of the compositions such as amplifier U17 and its attached resistance
It number is input to the cathode of amplifier U27 again, the anode of amplifier 27 is grounded by pull down resistor R152, and the cathode of amplifier U27 is simultaneously
Also by resistance R149 connection benchmark power supply signal VREF, while also passing through the output end of resistance R151 connection amplifiers U27；Amplifier
After the output end of U27 is filtered by π types filter circuit (resistance R150, capacitance C52 and C72), final basis is exported
Sampled data information.
The course of work of foregoing circuit is as follows：The signal of current transformer output, it is whole after resistance R5, then by full-bridge
After flow module rectification, you can the half-wave signa (VDD1 as shown in the figure) after output rectification, half-wave signa pass through capacitance C19 and C24
LDO chips (such as LDO chips of model XC6206P312MR) are inputted after filtering, you can export the power supply of final stabilization
Signal VMCU supplying power for outside；Capacitance C23 is also used for filtering；Diode D14 and D15 are then used to protect circuit, prevent LDO chips
Signal pours in down a chimney into front-end circuit；Wherein zener diode V2 and V13 is then used to carry out the signal VDD1 that rectification module exports
Protection, to prevent, the signal of input LDO chips is excessive and damages LDO chips.
The signal at the both ends sample circuit R5 is input to subtraction circuit module；Wherein, sig1 signals are in resistance R5 and two poles
The effect of pipe V26 forms the sinusoidal waveform that positive half-wave is more than negative half-wave, and sig2 due to voltage-stabiliser tube there are wave mode can quickly on
It is raised to the operation voltage of voltage-stabiliser tube, it is then slowly varying.No matter how line current direction changes, and current transformer induces
Electric current need all by resistance R5, it is possible to the pressure difference at the both ends resistance R5 is obtained by subtracter；Due to sig1 and
For the voltage of sig2 when power network line electric current is bigger, voltage value can be relatively high, so being divided (by resistance
R48 and R51 divides sig2, is divided to signal sig1 by resistance R52 and R53) after be sent to subtracter U17, due to sig1 and
There are negative voltages by sing2, so positive-negative power is needed to power；The circuit of amplifier U26 compositions is charge pump, is responsible for negative supply
It provides, subtraction process is done to signal sig1 and sig2 by U17, the sine wave of Symmetrical can be obtained in the output end of U17, so
Sine wave accesses 4 feet of U27 by resistance R133 afterwards, while accessing the base of 4 feet generated also by reference voltage chip U9
Quasi- voltage, two signals are overlapped by U27, to obtain centered on reference voltage, the sine wave that fluctuates up and down；And most
The sine wave obtained eventually, by obtaining final signal AD0 after filter circuit；The processor subsequently connected is to this AD0 signal
It is handled.
It is illustrated in figure 3 the method flow diagram of the method for the present invention：This power supply sample circuit provided by the invention
The power supply method of sampling, includes the following steps：
S1. current transformer incudes from electric system and obtains electric power signal；
S2. the obtained electric power signals of step S1 are sampled, and sampled signal is divided into two-way；
S3. the first via sampled signal that step S2 is obtained after rectifier bridge module rectification by obtaining direct current energy, then passes through
Voltage stabilizing module externally provides stable power supply signal；
S4. it after the second tunnel sampled signal that step S2 is obtained passes sequentially through subtraction circuit module and supercircuit module, obtains
To final electric system electric energy sampling signal, and device provides basic sampled signal in order to control.
This power supply sample circuit provided by the present application and the power supply method of sampling, can be used for other any need and are carried out at the same time
Power grid takes electricity to power and to the electronic equipment that power grid energy information is sampled, 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 collector, measuring instrument, write by hand device, fault detector etc..
Claims (10)
1. a kind of power supply sample circuit, it is characterised in that including current transformer, rectification module, Voltage stabilizing module, sampling module, subtract
Method circuit module and supercircuit module；The input terminal of current transformer connects power grid, the output end of current transformer and sampling
Module, rectification module and Voltage stabilizing module are sequentially connected in series, at the same the output end of sampling module also with subtraction circuit module, supercircuit
Module is sequentially connected in series；The output end of current transformer is divided into two paths of signals after being sampled by sampling module, first via signal passes through
Rectification module and Voltage stabilizing module output power supply electric energy, second road signal export electricity by subtraction circuit module and supercircuit module
The electric power signal sampled data of net.
2. power supply sample circuit according to claim 1, it is characterised in that between the rectification module and Voltage stabilizing module
It is serially connected with protection module；Protection module is used to provide electric protection to Voltage stabilizing module.
3. power supply sample circuit according to claim 1 or 2, it is characterised in that the sampling module is resistance sampling electricity
Road.
4. power supply sample circuit according to claim 1 or 2, it is characterised in that the rectification module is full-bridge rectification mould
Block.
5. power supply sample circuit according to claim 4, it is characterised in that the full-bridge rectification module is by four two
The full-bridge rectification module that pole pipe is constituted.
6. power supply sample circuit according to claim 5, it is characterised in that the output end of the current transformer with adopt
Egf block, rectification module are sequentially connected in series, and specially output end one end of current transformer exports the first signal, and the first signal passes through
Second signal is exported after concatenated sampling resistor；The four or two pole of output end other end connection full-bridge rectification module of current transformer
The cathode of pipe, the plus earth of the 4th diode；Second signal simultaneously connect the first diode of full-bridge rectification module anode and
The cathode of the second diode of full-bridge rectification module；The plus earth of the second diode of full-bridge rectification module；Full-bridge rectification module
The cathode of one diode is the output end of full-bridge rectification module, while also connecting the cathode of full-bridge rectification module third diode,
The cathode of the 4th diode of anode connection full-bridge rectification module of full-bridge rectification module third diode.
7. power supply sample circuit according to claim 6, it is characterised in that the supercircuit module is to be put by operation
The add circuit that big device is constituted.
8. power supply sample circuit according to claim 7, it is characterised in that the subtraction circuit module is to be put by operation
The subtraction circuit that big device is constituted.
9. the power supply method of sampling of the power supply sample circuit described in a kind of one of claim 1~8, it is characterised in that including as follows
Step：
S1. current transformer incudes from electric system and obtains electric power signal；
S2. the obtained electric power signals of step S1 are sampled, and sampled signal is divided into two-way；
S3. the first via sampled signal that step S2 is obtained after rectifier bridge module rectification by obtaining direct current energy, then passes through voltage stabilizing
Module externally provides stable power supply signal；
S4. it after the second tunnel sampled signal that step S2 is obtained passes sequentially through subtraction circuit module and supercircuit module, obtains most
Whole electric system electric energy sampling signal, and device provides basic sampled signal in order to control.
10. a kind of fault detector, it is characterised in that including the power supply sample circuit and right described in one of claim 1~8
It is required that the power supply method of sampling described in 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810322717.6A CN108508322B (en) | 2018-04-11 | 2018-04-11 | Power supply sampling circuit, power supply sampling method and fault indicator manufactured by same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810322717.6A CN108508322B (en) | 2018-04-11 | 2018-04-11 | Power supply sampling circuit, power supply sampling method and fault indicator manufactured by same |
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| CN108508322A true CN108508322A (en) | 2018-09-07 |
| CN108508322B CN108508322B (en) | 2024-02-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN110850143A (en) * | 2019-10-25 | 2020-02-28 | 天津航空机电有限公司 | Multi-voltage acquisition and fault detection circuit for eliminating floating voltage |
| 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 |
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| CN107422179A (en) * | 2017-09-08 | 2017-12-01 | 威胜电气有限公司 | New power supply sample circuit, the power supply method of sampling and its low-voltage circuit breaker |
| CN207965021U (en) * | 2018-04-11 | 2018-10-12 | 威胜信息技术股份有限公司 | Power supply sample circuit and its manufactured fault detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| CN110850143A (en) * | 2019-10-25 | 2020-02-28 | 天津航空机电有限公司 | Multi-voltage acquisition and fault detection circuit for eliminating floating voltage |
| 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 |
| CN113078812B (en) * | 2021-03-18 | 2022-09-09 | 浙江聚创智能科技股份有限公司 | Current transformer sampling power-taking self-switching circuit |
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| CN108508322B (en) | 2024-02-27 |
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