CN201314924Y - Alternating current precision testing power supply - Google Patents
Alternating current precision testing power supply Download PDFInfo
- Publication number
- CN201314924Y CN201314924Y CNU2008202205966U CN200820220596U CN201314924Y CN 201314924 Y CN201314924 Y CN 201314924Y CN U2008202205966 U CNU2008202205966 U CN U2008202205966U CN 200820220596 U CN200820220596 U CN 200820220596U CN 201314924 Y CN201314924 Y CN 201314924Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- input end
- output terminal
- power supply
- negative feedback
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses an alternating current precision testing power supply comprising a waveform synthesis control circuit, a negative feedback amplifying circuit, a power amplifying circuit, an output transformer and a voltage gear switching circuit. The output end of the waveform synthesis control circuit is connected with the input end of the negative feedback amplifying circuit, the output end of the negative feedback amplifying circuit is connected with the input end of the power amplifying circuit, the output end of the power amplifying circuit is connected with the input end of the output transformer, and the output end of the output transformer is connected with the input end of the voltage gear switching circuit. The alternating current precision testing power supply is characterized in that the negative feedback amplifying circuit is the front direct current negative feedback amplifying circuit. The alternating current precision testing power supply adopts the front direct current feedback amplifying circuit, so that the self-excited phase shift problem is avoided and can work normally with the loads of any nature, and the range of applications is wide.
Description
Technical field
The utility model relates to a kind of supply unit, especially a kind of device that exchanges the precision measurement power supply.
Background technology
The power amplification of testing power supply all will be adopted negative-feedback technology, purpose is for output voltage can not changed because of the size of load, present precision measurement power supply adopts and exchanges negative-feedback technology, but exchange the tested instrument that negative-feedback technology is not suitable for capacitive, as multifunctional electric energy meter, when the big tested instrument of these capacitives of testing power supply band, can produce phase shift to voltage, adopt the interchange negative-feedback technology can make the Voltage Feedback of phase shift behind input end, form positive feedback, cause self-excitation, damage testing power supply and tested instrument.
The utility model content
The purpose of this utility model provides a kind of interchange precision measurement power supply, can be with the load of any character, and applied widely.
For achieving the above object, the utility model adopts following technical scheme: a kind of interchange precision measurement power supply, comprise the waveform synthetic control circuit, negative feedback amplifier circuit, power amplification circuit, output transformer, voltage gear commutation circuit, the output terminal of waveform synthetic control circuit is connected with the input end of negative feedback amplifier circuit, the output terminal of negative feedback amplifier circuit is connected with the input end of power amplification circuit, the output terminal of power amplification circuit is connected with the input end of output transformer, the output terminal of output transformer is connected with the input end of voltage gear commutation circuit, it is characterized in that: described negative feedback amplifier circuit is preposition direct current negative feedback amplifier circuit.
Described preposition direct current negative feedback amplifier circuit comprises the input signal rectification circuit, the input signal filtering circuit, the feedback signal rectification circuit, the feedback signal filtering circuit, comparator circuit, multiplier, the voltage amplifier stage circuit, the input end of input signal rectification circuit is connected with the output terminal of waveform synthetic control circuit, the output terminal of input signal rectification circuit is connected with the input end of input signal filtering circuit, the output terminal of input signal filtering circuit is connected with the input end of comparator circuit, the input end of feedback signal rectification circuit is connected with the output terminal of output transformer, the output terminal of feedback signal rectification circuit is connected with the input end of feedback signal filtering circuit, the output terminal of feedback signal filtering circuit is connected with another input end of comparator circuit, the output terminal of comparator circuit is connected with the first input end of multiplier, the output terminal of waveform synthetic control circuit is connected with second input end of multiplier, and the output terminal of multiplier is connected with the input end of voltage amplifier stage circuit.
Between second input end of the output terminal of described waveform synthetic control circuit and multiplier, between the input end of the output terminal of waveform synthetic control circuit and input signal rectification circuit, between the input end of the output terminal of output transformer and feedback signal rectification circuit, all be connected with discharge circuit between the input end of the output terminal of multiplier and voltage amplifier stage circuit.
The output terminal of the discharge circuit that is connected between the input end of the output terminal of described output transformer and feedback signal rectification circuit also is connected with triode and expands current circuit.
Also be connected with 2 between the output terminal of described comparator circuit and the first input end of multiplier and select 1 analog switching circuit.
Also be connected with warning circuit in the described preposition direct current negative feedback amplifier circuit, the input end of warning circuit is connected with the output terminal of comparator circuit.
Also be connected with current feedback circuit in the described preposition direct current negative feedback amplifier circuit, the input end of current feedback circuit is connected with the input end of output transformer.
The utility model exchanges the precision measurement power supply and adopts preposition amplification direct current negative-feedback circuit, feedback signal compares with input signal behind rectifying and wave-filtering, the problem that the phase place phase shift causes self-excitation can not appear, can operate as normal with the load of any character, and applied widely.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present utility model;
Fig. 2 is the theory diagram of preposition amplification direct current negative-feedback circuit;
Fig. 3 is a preposition amplification direct current negative-feedback circuit schematic diagram of the present utility model;
Embodiment
As shown in Figure 1, the utility model exchanges the precision measurement power supply and comprises waveform synthetic control circuit, preposition direct current negative feedback amplifier circuit, power amplification circuit, output transformer and voltage gear commutation circuit, the output terminal of waveform synthetic control circuit is connected with the input end of preposition direct current negative feedback amplifier circuit, the output terminal of preposition direct current negative feedback amplifier circuit is connected with the input end of power amplification circuit, the output terminal of power amplification circuit is connected with the input end of output transformer, and the output terminal of output transformer is connected with the input end of voltage gear commutation circuit.
As shown in Figure 1, waveform synthetic control circuit output AC voltage sine wave signal Ui, Ui imports preposition direct current negative feedback amplification module, the feedback signal U that the output transformer output terminal is got also imports preposition direct current negative feedback amplifier circuit, after the processing of preposition direct current negative feedback amplifier circuit, the voltage signal Uout power input amplifying circuit of output, the voltage signal of power amplification circuit output is input to output transformer, export the required voltage of user via voltage gear commutation circuit again, in order to make the good stability of circuit, the current feedback signal that the input end of output transformer is got also is input to preposition direct current negative-feedback circuit.
As shown in Figures 2 and 3, after the output terminal Ui of waveform synthetic control circuit connects resistance R 4, the reverse input end that connects amplifier U2, the used device of amplifier U2 is OP-O7, the output terminal of amplifier U2 is connected with the reverse input end of input signal rectification circuit, the input signal rectification circuit is made of amplifier U4B and U4A and peripheral circuit thereof, the used device of amplifier U4 is LM324, after the output terminal of input signal rectification circuit connects resistance R 11, be connected with the input end of input signal filtering circuit, the input signal filtering circuit is made of resistance R 12 and capacitor C 3, the output terminal of input signal filtering circuit connects resistance R 13 backs and is connected with the positive input of the amplifier U5 of comparator circuit, comparator circuit is made up of amplifier U5 and peripheral circuit thereof, and the used device of amplifier U5 is OP-O7; The output terminal U of output transformer connects the reverse input end of amplifier U3, the used device of amplifier U3 is OP-O7, after the output terminal of amplifier U3 connects two complementary triodes expansion current circuits, be connected with the input end of feedback signal rectification circuit, the feedback signal rectification circuit is made of amplifier U4C and U4D and peripheral circuit thereof, after the output terminal of feedback signal rectification circuit connects R24, be connected with the input end of feedback signal filtering circuit, the feedback signal filtering circuit is made of resistance R 25 and C5, and the output terminal of feedback signal filtering circuit connects resistance R 26 backs and is connected with the reverse input end of amplifier U5 in the comparator circuit; The output terminal of comparator circuit connects and connects the 2 input end X1 that select 1 analog switching circuit after the diode VD7,2 select 1 analog switching circuit to select 1 analog switch UA and its peripheral circuit to form by 2,2 to select the used device of 1 analog switch UA be 4053,2 select the input end Y1 of the output terminal connection multiplier U6 of 1 analog switching circuit, and the used device of multiplier U6 is AD633; After the output terminal Ui of waveform synthetic control circuit connects resistance R 1, connect the reverse input end of amplifier U1, the used device of amplifier U1 is OP-O7, after the output terminal serial connection capacitor C 1 of amplifier U1, the resistance R 3, connects the input end X1 of multiplier U6; After the output terminal W of multiplier U6 connects capacitor C 8, resistance R 34, the reverse input end that connects amplifier U7 again, the used device of amplifier U7 is OP-O7, it is that the base stage of triode VT3 is connected that the output terminal of amplifier U7 connects after capacitor C 11, the resistance R 39 with the input end of voltage amplifier stage circuit, and the voltage amplifier stage circuit is that its peripheral components circuit constitutes by triode VT3, VT4, VT5, VT6, VTA, VTB.Also be provided with warning circuit in this preposition direct current negative feedback amplifier circuit, the input end of warning circuit is connected behind diode VD7 with the output terminal of comparator circuit, 2 select the input end X1 of 1 analog switch to connect stabilivolt VW2, series resistor R52 again, connect the base stage of triode VT7, the collector connection trigger U10B of triode VT7 afterwards, through diode VD12, resistance R 58, connect the base stage of triode VT9 afterwards, serial connection capacitor C 17 between the collector and emitter of triode VT9.Also be provided with current feedback circuit in this preposition direct current negative feedback amplifier circuit, the input end of current feedback circuit is connected with a resistance of the input end of output transformer, the current feedback circuit input end is connected in series two resistance R 59, R60, insert the inverting input of amplifier U7 afterwards, the common port of resistance R 59, R60 connects capacitor C 18, capacitor C 18 ground connection.
The principle of work of preposition amplification direct current negative feedback amplifier circuit as shown in Figure 3, the input voltage Ui of this circuit is an AC signal, input voltage signal Ui divide two-way, one road signal is after the elementary amplification of amplifier U1, through capacitor C 1, resistance R 3, stopping direct current is imported multiplier U6 input end X1 afterwards again; Another road signal is after after the elementary amplification of amplifier U2, behind the precision rectifying of input signal rectification circuit, through the filtering of input signal filtering circuit, import comparator circuit more again; The feedback signal U that is got from the output transformer output terminal is through the elementary amplification of amplifier U3, expand the expansion stream of current circuit again through complementary triode, precision rectifying through the feedback signal rectification circuit becomes direct current signal afterwards, and then through the filtering of feedback signal filtering circuit, the input comparator circuit, another input signal of this input signal and comparator circuit is through the comparison of comparator circuit, from comparator circuit output terminal output quantity F, the output signal of comparator circuit selects 1 analog switching circuit to import the input end Y1 of multiplier U6 through 2, the signal of the input end X1 of control multiplier U6, through the amplification of the synthesized output signal of multiplier U6 through amplifier U7, input to the voltage amplifier stage circuit, through the amplification quantity K of voltage amplifier stage circuit, from the stable voltage signal Uout of voltage amplifier stage circuit output, Uout=K * F * Ui.The warning circuit that is provided with in this circuit, when load voltage was excessive, when the voltage of stabilivolt VW2 surpassed 10V, through software control, waveform control circuit CPU received alerting signal and reports to the police then.Insert current feedback signal UIF in this circuit, stabilization signal waveform mid point makes the good stability of circuit.
Claims (7)
1. one kind exchanges the precision measurement power supply, comprise the waveform synthetic control circuit, negative feedback amplifier circuit, power amplification circuit, output transformer, voltage gear commutation circuit, the output terminal of waveform synthetic control circuit is connected with the input end of negative feedback amplifier circuit, the output terminal of negative feedback amplifier circuit is connected with the input end of power amplification circuit, the output terminal of power amplification circuit is connected with the input end of output transformer, the output terminal of output transformer is connected with the input end of voltage gear commutation circuit, it is characterized in that: described negative feedback amplifier circuit is preposition direct current negative feedback amplifier circuit.
2. interchange precision measurement power supply according to claim 1, it is characterized in that: described preposition direct current negative feedback amplifier circuit comprises the input signal rectification circuit, the input signal filtering circuit, the feedback signal rectification circuit, the feedback signal filtering circuit, comparator circuit, multiplier, the voltage amplifier stage circuit, the input end of input signal rectification circuit is connected with the output terminal of waveform synthetic control circuit, the output terminal of input signal rectification circuit is connected with the input end of input signal filtering circuit, the output terminal of input signal filtering circuit is connected with the input end of comparator circuit, the input end of feedback signal rectification circuit is connected with the output terminal of output transformer, the output terminal of feedback signal rectification circuit is connected with the input end of feedback signal filtering circuit, the output terminal of feedback signal filtering circuit is connected with another input end of comparator circuit, the output terminal of comparator circuit is connected with the first input end of multiplier, the output terminal of waveform synthetic control circuit is connected with second input end of multiplier, and the output terminal of multiplier is connected with the input end of voltage amplifier stage circuit.
3. interchange precision measurement power supply according to claim 2 is characterized in that: between second input end of the output terminal of described waveform synthetic control circuit and multiplier, between the input end of the output terminal of waveform synthetic control circuit and input signal rectification circuit, between the input end of the output terminal of output transformer and feedback signal rectification circuit, all be connected with discharge circuit between the input end of the output terminal of multiplier and voltage amplifier stage circuit.
4. interchange precision measurement power supply according to claim 3 is characterized in that: the output terminal of the discharge circuit that is connected between the input end of the output terminal of described output transformer and feedback signal rectification circuit also is connected with triode and expands current circuit.
5. interchange precision measurement power supply according to claim 4 is characterized in that: also be connected with 2 between the output terminal of described comparator circuit and the first input end of multiplier and select 1 analog switching circuit.
6. according to arbitrary described interchange precision measurement power supply in the claim 1 to 5, it is characterized in that: also be connected with warning circuit in the described preposition direct current negative feedback amplifier circuit, the input end of warning circuit is connected with the output terminal of comparator circuit.
7. interchange precision measurement power supply according to claim 6 is characterized in that: also be connected with current feedback circuit in the described preposition direct current negative feedback amplifier circuit, the input end of current feedback circuit is connected with the input end of output transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202205966U CN201314924Y (en) | 2008-11-03 | 2008-11-03 | Alternating current precision testing power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202205966U CN201314924Y (en) | 2008-11-03 | 2008-11-03 | Alternating current precision testing power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201314924Y true CN201314924Y (en) | 2009-09-23 |
Family
ID=41126723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202205966U Expired - Fee Related CN201314924Y (en) | 2008-11-03 | 2008-11-03 | Alternating current precision testing power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201314924Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253258A (en) * | 2011-04-27 | 2011-11-23 | 云南省计量测试技术研究院 | Alternating/direct current calibration source |
| CN102540013A (en) * | 2011-12-27 | 2012-07-04 | 广东电网公司韶关供电局 | Transformer substation grounding network frequency response test device |
| CN102841227A (en) * | 2012-08-15 | 2012-12-26 | 广东电网公司电力科学研究院 | High precision large alternating current output device |
| CN104122422A (en) * | 2014-07-08 | 2014-10-29 | 国家电网公司 | Constant current power supply generation circuit |
-
2008
- 2008-11-03 CN CNU2008202205966U patent/CN201314924Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253258A (en) * | 2011-04-27 | 2011-11-23 | 云南省计量测试技术研究院 | Alternating/direct current calibration source |
| CN102540013A (en) * | 2011-12-27 | 2012-07-04 | 广东电网公司韶关供电局 | Transformer substation grounding network frequency response test device |
| CN102841227A (en) * | 2012-08-15 | 2012-12-26 | 广东电网公司电力科学研究院 | High precision large alternating current output device |
| CN102841227B (en) * | 2012-08-15 | 2015-02-11 | 广东电网公司电力科学研究院 | High precision large alternating current output device |
| CN104122422A (en) * | 2014-07-08 | 2014-10-29 | 国家电网公司 | Constant current power supply generation circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201314924Y (en) | Alternating current precision testing power supply | |
| CN102156263A (en) | Excitation system simulation test device for synchronous generator | |
| CN204945867U (en) | A kind of maximal power tracing controlling apparatus being applied to photovoltaic generating system | |
| CN201392382Y (en) | Generating energy testing instrument of solar cell component | |
| CN2773698Y (en) | Insulating resistance tester of 30 loop thin-membrane capacitor | |
| CN105116956A (en) | Maximum power tracing controller applied to photovoltaic power generation system | |
| CN203396801U (en) | Device for achieving current harmonic and detection and testing device for error influence quantity of watt-hour meter | |
| CN204142782U (en) | The high precision numerical control power supply that a kind of output waveform is controlled | |
| CN206058028U (en) | DDS signal generator based on FPGA | |
| CN203759106U (en) | Commercial power zero cross detection circuit | |
| CN202486205U (en) | Voltage zero-crossing detection circuit and device | |
| CN203745579U (en) | Frequency characteristic test instrument based on waveform superposition | |
| CN202735404U (en) | A power detection circuit and an electric fan using the power detection circuit | |
| CN207098975U (en) | A kind of counter electromotive force absorbing circuit | |
| CN205317849U (en) | Commercial power electric power parameter detecting system | |
| CN101452015A (en) | Low power consumption isolation detection circuit for detecting high-pressure AC and detecting method thereof | |
| CN204967269U (en) | Control of power quality device is synthesized to hybrid | |
| CN2524430Y (en) | Voltage/current conversion circuit | |
| CN208337526U (en) | A kind of precision synchronous function generating circuit | |
| CN220171457U (en) | High-precision programmable current source generating device | |
| CN204131421U (en) | A kind of voltage output control circuit | |
| CN205212818U (en) | Frequency to voltage (F -V) converting circuit | |
| CN204578419U (en) | A kind of drive circuit of water conservancy generator | |
| CN204613300U (en) | A kind of power acquirer | |
| CN207339656U (en) | A kind of step-up switching power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090923 Termination date: 20171103 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |