CN208076704U - Small signal source for examining and determine indirect access type direct current energy meter - Google Patents
Small signal source for examining and determine indirect access type direct current energy meter Download PDFInfo
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- CN208076704U CN208076704U CN201820600982.1U CN201820600982U CN208076704U CN 208076704 U CN208076704 U CN 208076704U CN 201820600982 U CN201820600982 U CN 201820600982U CN 208076704 U CN208076704 U CN 208076704U
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- 230000005611 electricity Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 2
- 238000012795 verification Methods 0.000 abstract description 2
- 230000003321 amplification Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
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Abstract
The utility model is related to electric energy metering verification technical fields, it is a kind of small signal source for examining and determine indirect access type direct current energy meter comprising division module, analog switch, voltage follow module, filter rectification module and the power amplifier module being sequentially electrically connected；Division module to the voltage of input divide and export the first voltage after partial pressure to analog switch；First voltage adjustment output is second voltage by adjusting duty ratio by analog switch；Voltage follow module carries out Buffer output tertiary voltage to second voltage；Filter rectification module is filtered the 4th voltage of output etc. to tertiary voltage.The utility model adjusts duty ratio by controlling the make-and-break time of analog switch, realization continuously adjusts and stablizes output to DC reference voltage, the output of voltage continuously smooth is realized by voltage follow module, filter rectification module, small signal is provided to be detected indirect access type direct current energy meter, ensures that tested indirect access type direct current energy meter calibrating is accurately normally carried out.
Description
Technical field
It is that one kind is used to examine and determine indirect access type direct current energy meter the utility model is related to electric energy metering verification technical field
Small signal source.
Background technology
Direct current energy meter is divided into direct access and indirectly access when measuring DC current according to the size for measuring electric current
Direct access may be used when testing low current, but usually all use and divide when testing high current for two kinds of measurement methods of formula
Flow the indirect access type of device.
Indirect access electric energy meter at work can external current divider, current divider is really a low resistance, according to electricity
The voltammetric characteristic measuring electric current of resistance generates pressure drop when there is D.C. high-current to pass through current divider, can export mV grades of voltage between
Connect access electric energy meter.When therefore examining and determine indirect access electric energy meter, it is desirable that calibrating installation can export the small signal of millivolt level
Voltage, the lower bound for adjusting output mV generally should be the 1/2 of tested indirect access electric energy meter starting current value, consider simultaneously
The possible preferred value of current divider also has the low voltage values such as 30mV and 15mV, therefore the lower bound of calibrating installation adjusting output mV should be less than
10 μ V are advisable.And the maximum difficult point of access electric energy meter calibrating installation is that the processing of the small signal of voltage indirectly, traditional is small
Big voltage is converted into small signal by signal voltage source generally use resitstance voltage divider or D/A converter, here traditional small letter
Number voltage source exist can only definite value output, be unable to the output of continuously smooth.
Invention content
The utility model provides a kind of small signal source for examining and determine indirect access type direct current energy meter, overcomes
The deficiency of the above-mentioned prior art, can effectively solve existing for existing small signal source can only definite value output small signal,
The problem of small signal of output cannot being continuously adjusted and stablize output.
The technical solution of the utility model is realized by following measures：One kind is for examining and determine indirect access type direct current
The small signal source of electric energy meter, including be sequentially electrically connected division module, analog switch, voltage follow module, filter rectification
Module and power amplifier module；The division module divides the voltage of input, and the first voltage after partial pressure is exported
To analog switch；First voltage adjustment output is second voltage by adjusting duty ratio by the analog switch；The voltage with
Buffer output tertiary voltage is carried out to second voltage with module；The filter rectification module is filtered output to tertiary voltage
Four voltages；The 4th voltage of the power amplifier module pair is filtered the 5th voltage of output.
Here is the further optimization and/or improvements to above-mentioned utility model technical solution：
Above-mentioned division module may include second resistance and concatenated first resistor and operational amplifier, one end of second resistance
It is electrically connected with operational amplifier in-phase input end, the other end of second resistance is electrically connected with operational amplifier output terminal, and operation is put
The reverse inter-input-ing ending grounding of big device, the output end of operational amplifier are electrically connected with the input terminal of analog switch.
Above-mentioned voltage follow module can be voltage follower, the output end of analog switch and the homophase input of voltage follower
End electrical connection, the reverse input end of voltage follower are electrically connected with the output end of voltage follower, the output end of voltage follower
It is electrically connected with filter rectification module input.
Above-mentioned filter rectification module may include 3rd resistor and the first capacitance, output end and the third electricity of voltage follow module
One end of resistance is electrically connected, and the input terminal of the other end of 3rd resistor respectively with one end of the first capacitance and power amplifier module is electrically connected
It connects, the other end ground connection of the first capacitance.
Above-mentioned power amplifier module can be power amplifier, the output end of filter rectification module and the same phase of power amplifier
Input terminal is electrically connected, and the reverse input end of power amplifier is electrically connected with the output end of power amplifier.
The utility model reasonable and compact in structure, easy to use, solving can only determine existing for existing small signal source
Value output small signal passes through control the problem of cannot be continuously adjusted to the small signal of output and stablize output
The make-and-break time of analog switch adjusts duty ratio, realizes continuously adjusting and stablize output to DC reference voltage, and pass through
Voltage follow module, filter rectification module and power amplifier module realize the output of voltage continuously smooth, to be tested indirect
Access type direct current energy meter provides small signal, ensure tested indirect access type direct current energy meter calibrating it is accurate normally into
Row.
Description of the drawings
Attached drawing 1 is the electrical block diagram of the best embodiment of the utility model.
Attached drawing 2 is the square-wave waveform figure generated when the analog switch work in attached drawing 1.
Coding in attached drawing is respectively：1 is division module, and 2 be voltage follow module, and 3 be filter rectification module, and 4 be work(
Rate amplification module, U0For the DC voltage of D/A converter output, U1For first voltage, K1For analog switch, U2For second voltage, U3
For tertiary voltage, U4For the 4th voltage, U5For the 5th voltage, R1For first resistor, R2For second resistance, A1For operational amplifier,
A2For voltage follower, R3For 3rd resistor, C1For the first capacitance, A3For power amplifier, T1For analog switch K1Closure when
It is long, T2For analog switch K1The duration of disconnection.
Specific implementation mode
The utility model is not limited by following embodiments, can technical solution according to the present utility model and actual conditions
Determine specific embodiment.
The utility model is further described with reference to embodiment and attached drawing：
As shown in attached drawing 1,2, this is used to examine and determine the small signal source of indirect access type direct current energy meter, including sequentially electric
The division module 1 of connection, analog switch K1, voltage follow module 2, filter rectification module 3 and power amplifier module 4；Described point
Die block 1 divides the voltage of input, and by the first voltage U after partial pressure1It exports to analog switch K1；The simulation is opened
Close K1By adjusting duty ratio by first voltage U1Adjustment output is second voltage U2；The voltage follow module 2 is to second voltage
U2Carry out Buffer output tertiary voltage U3；The filter rectification module 3 is to tertiary voltage U3It is filtered the 4th voltage U of output4；
The power amplifier module 4 is to the 4th voltage U4It is filtered the 5th voltage U of output5。
Above-mentioned analog switch K1By the difference of open and close time length, the size of control adjustment duty ratio provides
Different input energies exports square-wave voltage, that is, second voltage U2, to realize the big minor adjustment of output voltage, and keep voltage
The output of steady and continuous；Voltage follow module 2 is high with input impedance, and the feature that output impedance is low, can be to analog switch K1
The second voltage U of output2Into row buffering, ensure that rear stage circuit preferably works；Third electricity of the filter rectification module 3 to input
Press U3It is filtered, realizes the smooth output of voltage.
As shown in attached drawing 1,2, when work, DC voltage U that D/A converter is exported0Division module 1 is accessed, power is put
The output end of big module 4 is electrically connected with tested indirect access type direct current energy meter, if the DC voltage U of D/A converter output0For
2V exports the first voltage U of 200mV after the partial pressure of division module 11, first voltage U1It is input to analog switch K1, such as Fig. 2 institutes
Show, T1For analog switch K1The duration of closure, amplitude is high level U at this time1(first voltage), T2For analog switch K1Disconnection when
Long, amplitude is low level 0V at this time, then duty ratio a is shown below：
First voltage U1 obtains square-wave voltage i.e. second voltage U2 after analog switch K1 is adjusted, and second voltage U2 is through voltage
It following and obtains tertiary voltage U3 after module 2, the filtered rectification modules 3 of tertiary voltage U3 obtain the 4th voltage U4 after filtering, and the 4th
The average value of voltage U4 is shown below：
Here according to the 4th voltage U known to formula (1)4The continuous output within the scope of 10 μ V to 200mV, the 4th voltage can be achieved
U4The 5th voltage U is obtained after the amplification of power amplifier module 45, by the 5th voltage U5The tested indirect access type direct current energy of access
Table examines and determine tested indirect access type direct current energy meter.
Under normal circumstances, the DC voltage U exported in actual operation through D/A converter0It is 2V, and 2V is through direct current
Output DC reference voltage is generally 200mV after pressure division module 1 divides, and thus the utility model passes through analog switch K1It realizes
Continuous output within the scope of 10 μ V to 200mV can meet the needs of real work completely.
Therefore the utility model is simple in structure, and easy to use, solving can only definite value existing for existing small signal source
Small signal is exported, the problem of cannot be continuously adjusted to the small signal of output and stablize output, by controlling mould
Quasi- switch K1Make-and-break time adjust duty ratio, realize continuously adjusting and stablize output to DC reference voltage, and pass through
Voltage follow module 2, filter rectification module 3 and power amplifier module 4 realize the output of voltage continuously smooth, between being tested
Connect access type direct current energy meter and small signal be provided, ensure tested indirect access type direct current energy meter calibrating it is accurate normally into
Row.
The above-mentioned small signal source for examining and determine indirect access type direct current energy meter can be made into one according to actual needs
Step optimization or/and improvement：
As shown in attached drawing 1,2, the division module 1 includes second resistance R2With concatenated first resistor R1And operation amplifier
Device A1, second resistance R2One end and operational amplifier A1In-phase input end is electrically connected, second resistance R2The other end put with operation
Big device A1Output end is electrically connected, operational amplifier A1Reverse inter-input-ing ending grounding, operational amplifier A1Output end and analog switch
K1Input terminal electrical connection.
Here first resistor R1One end be electrically connected with D/A converter output end, i.e., D/A converter output DC voltage U0
Flow into first resistor R1, first resistor R1The other end and operational amplifier A1In-phase input end is electrically connected.
As shown in attached drawing 1,2, the voltage follow module 2 is voltage follower A2, analog switch K1Output end and voltage
Follower A2In-phase input end electrical connection, voltage follower A2Reverse input end and voltage follower A2Output end be electrically connected
It connects, voltage follower A2Output end be electrically connected with 3 input terminal of filter rectification module.
Here voltage follower A2For existing known technology, it is mainly used for analog switch K1The second voltage U of output2Into
Row buffering ensures that rear stage circuit preferably works.
As shown in attached drawing 1,2, the filter rectification module 3 includes 3rd resistor R3With the first capacitance C1, voltage follow module
2 output end and 3rd resistor R3One end electrical connection, 3rd resistor R3The other end respectively with the first capacitance C1One end and work(
The input terminal of rate amplification module 4 is electrically connected, the first capacitance C1The other end ground connection.
Here filter rectification module 3 is RC low-pass filter circuits, and RC low-pass filter circuits include 3rd resistor R3With first
Capacitance C1, it is mainly used for realizing the smooth output of voltage.
As shown in attached drawing 1,2, the power amplifier module 4 is power amplifier A3, the output end of filter rectification module 3 with
Power amplifier A3In-phase input end electrical connection, power amplifier A3Reverse input end and power amplifier A3Output end
Electrical connection.
Here power amplifier A3For existing known technology, it is mainly used for the 4th voltage U to input4It is amplified.
The above technical characteristic constitutes the most preferred embodiment of the utility model, with stronger adaptability and best implementation
Effect can increase and decrease non-essential technical characteristic, to meet the needs of different situations according to actual needs.
Claims (9)
1. a kind of small signal source for examining and determine indirect access type direct current energy meter, it is characterised in that including being sequentially electrically connected
Division module, analog switch, voltage follow module, filter rectification module and power amplifier module；The division module is to defeated
The voltage entered is divided, and the first voltage after partial pressure is exported to analog switch；The analog switch is by adjusting duty
Than being second voltage by first voltage adjustment output；The voltage follow module carries out Buffer output third electricity to second voltage
Pressure；The filter rectification module is filtered the 4th voltage of output to tertiary voltage；The 4th voltage of the power amplifier module pair
It is filtered the 5th voltage of output.
2. the small signal source according to claim 1 for examining and determine indirect access type direct current energy meter, feature exists
Include second resistance and concatenated first resistor and operational amplifier in the division module, one end and the operation of second resistance are put
Big device in-phase input end electrical connection, the other end of second resistance are electrically connected with operational amplifier output terminal, operational amplifier it is anti-
Phase input end grounding, the output end of operational amplifier are electrically connected with the input terminal of analog switch.
3. the small signal source according to claim 1 or 2 for examining and determine indirect access type direct current energy meter, feature
It is that the voltage follow module is voltage follower, the output end of analog switch and the in-phase input end of voltage follower are electrically connected
It connects, the reverse input end of voltage follower is electrically connected with the output end of voltage follower, the output end of voltage follower and filtering
Rectification module input terminal is electrically connected.
4. the small signal source according to claim 1 or 2 for examining and determine indirect access type direct current energy meter, feature
It is that the filter rectification module includes 3rd resistor and the first capacitance, the output end of voltage follow module and the one of 3rd resistor
End electrical connection, the other end of 3rd resistor are electrically connected with the input terminal of one end of the first capacitance and power amplifier module respectively, the
The other end of one capacitance is grounded.
5. the small signal source according to claim 3 for examining and determine indirect access type direct current energy meter, feature exists
In the filter rectification module include 3rd resistor and the first capacitance, the output end of voltage follow module and one end of 3rd resistor
Electrical connection, the other end of 3rd resistor are electrically connected with the input terminal of one end of the first capacitance and power amplifier module respectively, and first
The other end of capacitance is grounded.
6. the small signal source according to claim 1 or 2 for examining and determine indirect access type direct current energy meter, feature
It is that the power amplifier module is power amplifier, the output end of filter rectification module and the in-phase input end of power amplifier
Electrical connection, the reverse input end of power amplifier are electrically connected with the output end of power amplifier.
7. the small signal source according to claim 3 for examining and determine indirect access type direct current energy meter, feature exists
It is power amplifier in the power amplifier module, the output end of filter rectification module and the in-phase input end of power amplifier are electric
Connection, the reverse input end of power amplifier are electrically connected with the output end of power amplifier.
8. the small signal source according to claim 4 for examining and determine indirect access type direct current energy meter, feature exists
It is power amplifier in the power amplifier module, the output end of filter rectification module and the in-phase input end of power amplifier are electric
Connection, the reverse input end of power amplifier are electrically connected with the output end of power amplifier.
9. the small signal source according to claim 5 for examining and determine indirect access type direct current energy meter, feature exists
It is power amplifier in the power amplifier module, the output end of filter rectification module and the in-phase input end of power amplifier are electric
Connection, the reverse input end of power amplifier are electrically connected with the output end of power amplifier.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820600982.1U CN208076704U (en) | 2018-04-25 | 2018-04-25 | Small signal source for examining and determine indirect access type direct current energy meter |
| DE202018105618.2U DE202018105618U1 (en) | 2018-04-25 | 2018-09-28 | Small signal voltage source for verifying indirect access type DC meters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820600982.1U CN208076704U (en) | 2018-04-25 | 2018-04-25 | Small signal source for examining and determine indirect access type direct current energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208076704U true CN208076704U (en) | 2018-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820600982.1U Active CN208076704U (en) | 2018-04-25 | 2018-04-25 | Small signal source for examining and determine indirect access type direct current energy meter |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN208076704U (en) |
| DE (1) | DE202018105618U1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089245A (en) * | 2021-11-22 | 2022-02-25 | 广东电网有限责任公司广州供电局 | Meter checking instrument |
| CN118074518A (en) * | 2024-04-22 | 2024-05-24 | 深圳市力生美半导体股份有限公司 | Peak voltage regulating circuit and DC-DC converter circuit |
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2018
- 2018-04-25 CN CN201820600982.1U patent/CN208076704U/en active Active
- 2018-09-28 DE DE202018105618.2U patent/DE202018105618U1/en active Active
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| Publication number | Publication date |
|---|---|
| DE202018105618U1 (en) | 2018-12-07 |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210416 Address after: No. 200, Hengda street, Changchun middle road, high tech Zone (new urban district), Urumqi, Xinjiang Uygur Autonomous Region Patentee after: Marketing service center of State Grid Xinjiang Electric Power Co., Ltd. (capital intensive center, metering center) Patentee after: State Grid Corporation of China Address before: 830011 New District of Urumqi, the Xinjiang Uygur Autonomous Region (high tech Zone) 200 Hengda street, Changchun road. Patentee before: STATE GRID XINJIANG ELECTRIC POWER CO., LTD., ELECTRIC POWER Research Institute Patentee before: State Grid Corporation of China |