CN201726324U - Precision voltage-current conversion circuit - Google Patents
Precision voltage-current conversion circuit Download PDFInfo
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- CN201726324U CN201726324U CN2010202887464U CN201020288746U CN201726324U CN 201726324 U CN201726324 U CN 201726324U CN 2010202887464 U CN2010202887464 U CN 2010202887464U CN 201020288746 U CN201020288746 U CN 201020288746U CN 201726324 U CN201726324 U CN 201726324U
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Abstract
A precision voltage-current conversion circuit in the technical field of voltage-current conversion comprises a differential bleeder circuit, a precision rectifer circuit and a precision current mirror circuit, wherein an input end of the differential bleeder circuit is connected with a single-phase alternating current power supply, a differential signal output end of the differential bleeder circuit is connected with a signal input end of the precision rectifier circuit, a signal output end of the precision rectifier circuit is connected with the precision current mirror circuit, and the precision current mirror circuit outputs voltage or current signals. The precision voltage-current conversion circuit can directly convert alternating current voltage into high-precision sine half-wave direct current or voltage.
Description
Technical field
The utility model relates to the device in a kind of electric current and voltage switch technology field, specifically is a kind of accurate voltage current converter circuit.
Background technology
Along with power electronic technology develops rapidly, many converters all need the detection of grid voltage signal, are used for control, as the single-phase power factor correcting device.In the single-phase power factor correcting device, some simulation controls or digital control need detect single phase alternating current (A.C.) voltage signal without distortion, and the method for employing is varied.
Find through retrieval network voltage detection technology in the single-phase power factor correcting device, G.Comandatore and U.Moriconi.Designing a high power factor switching preregulator with the L4981 continuousmode.AN 628 ST Company, pp.1-23.Put down in writing the input voltage waveform detection method that adopts the current mirror principle behind a kind of rectifier bridge, its deficiency is: there is the intermodulation distortion phenomenon in diode, the resistance drop that detects electric current causes that level shifts and introduces and disturb, and can bring the inaccurate problem that detects, and heavy duty is particularly like this down.
Further retrieval is found, Philip C.Todd, UC3854 Controlled Power Factor Correction CircuitDesign.Unitrode Application Note, pp.40-44, no1, Jan.2002. put down in writing the input voltage waveform detection method that adopts the electric resistance partial pressure principle behind a kind of rectifier bridge, its deficiency is the same.
Above-mentioned technology mostly adopts the detection mode of voltage dividing potential drop behind the rectifier bridge or current mirror in traditional single-phase power factor correcting device.Its deficiency is: influenced by rectifier bridge, accuracy of detection is low, and the scope of application is narrower.Need testing circuit is improved for this reason.
The utility model content
The utility model provides a kind of accurate voltage current converter circuit at the prior art above shortcomings, can directly alternating voltage be converted into high-precision half-sinusoid direct current or voltage.
The utility model is achieved through the following technical solutions, the utility model comprises: differential bleeder circuit, precise rectification circuit and precision current mirror circuit, wherein: the input of differential bleeder circuit is connected with single phase alternating current power supply, the output of the differential wave of differential bleeder circuit links to each other with the signal input part of precise rectification circuit, the signal output part of precise rectification circuit connects precision current mirror circuit, precision current mirror circuit output voltage or current signal.
Described differential bleeder circuit comprises: four resistance, wherein: an end of first resistance links to each other with the single phase poaer supply zero line, the other end of first resistance links to each other with precise rectification circuit with an end of second resistance respectively, one end of the 3rd resistance links to each other with the live wire of single phase poaer supply, the other end of the 3rd resistance links to each other with an end of the 4th resistance and an end of the 6th resistance respectively, ground connection after the other end of second resistance links to each other with the other end of the 4th resistance.
Described precise rectification circuit comprises: two diodes, two power amplifiers and eight resistance, wherein: the negative electrode of first diode respectively with the other end of the 5th resistance, one end of the 8th resistance and the reverse input end of first power amplifier link to each other, the anode of first diode links to each other with the negative electrode of second diode and the output of first power amplifier respectively, second diode anode links to each other with the other end of the 8th resistance and an end of the 9th resistance respectively, the 3rd resistance in one end of the 6th resistance and the differential bleeder circuit and the common port of the 4th resistance link to each other, after linking to each other with an end of the 7th resistance, the other end of the 6th resistance links to each other with the non-inverting input of first power amplifier, the other end ground connection of the 7th resistance, the other end of the 9th resistance successively with the other end of the tenth resistance, one end of the 11 resistance and the reverse input end of second power amplifier are in series, the other end of the 11 resistance is in series and ground connection with the output of second power amplifier and an end of the 13 resistance in the precision current mirror circuit successively, one end of the 12 resistance links to each other with the non-inverting input of second power amplifier, its other end ground connection.
Described precision current mirror circuit comprises: three NPN triodes and four resistance, wherein: the base stage of a NPN triode respectively with the emitter of the 2nd NPN triode, the base stage of the 3rd NPN triode and an end of the 15 resistance link to each other, the collector electrode of the one NPN triode links to each other with the base stage of the 2nd NPN triode, the one NPN triode emitter link to each other with an end of the 14 resistance, the collector electrode of the 2nd NPN triode links to each other with the other end of the 13 resistance, the emitter of the 3rd NPN triode links to each other the other end of the 14 resistance with an end of the 16 resistance, ground connection after the other end of the 15 resistance and the other end of the 16 resistance link to each other.
Differential bleeder circuit in the utility model is responsible for dividing potential drop, other sinusoidal voltage waveform of picked up signal level; Precise rectification circuit is responsible for single-phase sinusoidal voltage rectification is become half-sinusoid voltage; It is the direct voltage of high amplitude, low ripple that the precision current mirror is responsible for the half-sinusoid boost in voltage.The differential voltage of utilizing the utility model detects, the precise rectification circuit and the precision current mirror circuit of maturation, any input voltage waveform high Precision Detection can be used for control, is not subjected to the influence of rectifier bridge.Has novel, accuracy of detection advantages of higher.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
Below embodiment of the present utility model is elaborated; present embodiment is being to implement under the prerequisite with technical solutions of the utility model; provided detailed execution mode and concrete operating process, but protection range of the present utility model is not limited to following embodiment.
As shown in Figure 1, present embodiment comprises: differential bleeder circuit 1, precise rectification circuit 2 and precision current mirror circuit 3, wherein: the input of differential bleeder circuit 1 is connected with zero line with the live wire of single phase poaer supply, its output is connected with the AC signal input of precise rectification circuit 2, the direct current signal output of precise rectification circuit 2 is connected with the input of precision current mirror circuit 3, and the output of precision current mirror circuit 3 connects external circuits.
Described differential bleeder circuit comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4, wherein: an end of first resistance R 1 links to each other with the single phase poaer supply zero line, and an end of the tenth resistance R 10 links to each other in an end of its other end and second resistance R 2, an end of the 5th resistance R 5, the precise rectification circuit.One end of the 3rd resistance R 3 links to each other with the live wire of single phase poaer supply, and its other end links to each other with an end of the 4th resistance R 4, an end of the 6th resistance R 6.Ground connection after the other end of second resistance R 2 links to each other with the other end of the 4th resistance R 4.
Described precise rectification circuit comprises: the first diode D1 and the second diode D2, the first power amplifier A1, the second power amplifier A2, the 5th resistance R 5～the 12 resistance R 12, wherein: the negative electrode of the first diode D1 links to each other with the other end of the 5th resistance R 5, an end of the 8th resistance R 8, the reverse input end of the first power amplifier A1, and its anode links to each other with the negative electrode of the second diode D2, the output of the first power amplifier A1.The second diode anode D2 links to each other with the other end of the 8th resistance R 8, an end of the 9th resistance R 9.The 3rd resistance R 3 in one end of the 6th resistance R 6 and the differential bleeder circuit and the common port of the 4th resistance R 4 link to each other, and its other end back that links to each other with an end of the 7th resistance R 7 links to each other with the non-inverting input of the first power amplifier A1.The other end ground connection of the 7th resistance R 7.After the other end of the other end of the 9th resistance R 9 and the tenth resistance R 10, an end of the 11 resistance R 11 link to each other, link to each other with the reverse input end of the second power amplifier A2.The other end of the 11 resistance R 11 links to each other with the output of the second power amplifier A2 afterwards and an end ground connection of the 13 resistance R 13 in the precision current mirror circuit.One end of the 12 resistance R 12 links to each other with the non-inverting input of the second power amplifier A2, its other end ground connection.
Described precision current mirror circuit comprises: a NPN triode T1, the 2nd NPN triode T2, the 3rd NPN triode T3 and the 13 resistance R 13～the 16 resistance R 16, wherein: the base stage of a NPN triode T1 links to each other with the emitter of the 2nd NPN triode T2, the base stage of the 3rd NPN triode T3, an end of the 15 resistance R 15, its collector electrode links to each other with the base stage of the 2nd NPN triode T2, and its emitter links to each other with an end of the 14 resistance R 14.The collector electrode of the 2nd NPN triode T2 links to each other with the other end of the 13 resistance R 13.The collector electrode of the 3rd NPN triode T3 links to each other with the outside, and its emitter links to each other with an end of the 16 resistance R 16.Ground connection after the other end of the 14 resistance R 14, the other end of the 15 resistance R 15 link to each other with the other end of the 16 resistance R 16.
In this example: the single phase alternating current (A.C.) input voltage is 220VAC, output half-sinusoid current amplitude 1mA.All components and parts all adopt high accuracy.Resistance R 1, R3 are 220k Ω, and resistance R 2, R4 are 1k Ω, and resistance R 57, R6 are 5.1k Ω, and resistance R 9, R10, R11 are 5.1k Ω, and resistance R 7, R12 are 5.1k Ω resistance, and R8 is 10k Ω, and diode D1, D2 are 1N4148.R15 can open a way, can be non-vanishing, and in order to increase the multiplication factor of T2.R13 equates with R14, and Current Negative Three-Point Capacitance resistance can be non-vanishing.Power amplifier A1～A2 is full amplitude, dual power supply.Triode T1～T3 is a NPN triode of the same type.
The differential voltage of utilizing the utility model detects, the precise rectification circuit and the precision current mirror circuit of maturation, any input voltage waveform high Precision Detection can be used for control, is not subjected to the influence of rectifier bridge.Has novel, accuracy of detection advantages of higher.
Claims (4)
1. accurate voltage current converter circuit, comprise: differential bleeder circuit, precise rectification circuit and precision current mirror circuit, it is characterized in that: the input of differential bleeder circuit is connected with single phase alternating current power supply, the output of the differential wave of differential bleeder circuit links to each other with the signal input part of precise rectification circuit, the signal output part of precise rectification circuit connects precision current mirror circuit, precision current mirror circuit output voltage or current signal.
2. accurate voltage current converter circuit according to claim 1, it is characterized in that, described differential bleeder circuit comprises: four resistance, wherein: an end of first resistance links to each other with the single phase poaer supply zero line, the other end of first resistance links to each other with precise rectification circuit with an end of second resistance respectively, one end of the 3rd resistance links to each other with the live wire of single phase poaer supply, the other end of the 3rd resistance links to each other with an end of the 4th resistance and an end of the 6th resistance respectively, ground connection after the other end of second resistance links to each other with the other end of the 4th resistance.
3. accurate voltage current converter circuit according to claim 1, it is characterized in that, described precise rectification circuit comprises: two diodes, two power amplifiers and eight resistance, wherein: the negative electrode of first diode respectively with the other end of the 5th resistance, one end of the 8th resistance and the reverse input end of first power amplifier link to each other, the anode of first diode links to each other with the negative electrode of second diode and the output of first power amplifier respectively, second diode anode links to each other with the other end of the 8th resistance and an end of the 9th resistance respectively, the 3rd resistance in one end of the 6th resistance and the differential bleeder circuit and the common port of the 4th resistance link to each other, after linking to each other with an end of the 7th resistance, the other end of the 6th resistance links to each other with the non-inverting input of first power amplifier, the other end ground connection of the 7th resistance, the other end of the 9th resistance successively with the other end of the tenth resistance, one end of the 11 resistance and the reverse input end of second power amplifier are in series, the other end of the 11 resistance is in series and ground connection with the output of second power amplifier and an end of the 13 resistance in the precision current mirror circuit successively, one end of the 12 resistance links to each other with the non-inverting input of second power amplifier, its other end ground connection.
4. accurate voltage current converter circuit according to claim 1, it is characterized in that, described precision current mirror circuit comprises: three NPN triodes and four resistance, wherein: the base stage of a NPN triode respectively with the emitter of the 2nd NPN triode, the base stage of the 3rd NPN triode and an end of the 15 resistance link to each other, the collector electrode of the one NPN triode links to each other with the base stage of the 2nd NPN triode, the one NPN triode emitter link to each other with an end of the 14 resistance, the collector electrode of the 2nd NPN triode links to each other with the other end of the 13 resistance, the emitter of the 3rd NPN triode links to each other the other end of the 14 resistance with an end of the 16 resistance, ground connection after the other end of the 15 resistance and the other end of the 16 resistance link to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202887464U CN201726324U (en) | 2010-08-11 | 2010-08-11 | Precision voltage-current conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202887464U CN201726324U (en) | 2010-08-11 | 2010-08-11 | Precision voltage-current conversion circuit |
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| CN201726324U true CN201726324U (en) | 2011-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010202887464U Expired - Fee Related CN201726324U (en) | 2010-08-11 | 2010-08-11 | Precision voltage-current conversion circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291022A (en) * | 2011-08-10 | 2011-12-21 | 深圳市核达中远通电源技术有限公司 | Synchronous rectifying circuit |
| CN108365759A (en) * | 2018-03-30 | 2018-08-03 | 佛山科学技术学院 | A kind of current/voltage converter circuit |
-
2010
- 2010-08-11 CN CN2010202887464U patent/CN201726324U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291022A (en) * | 2011-08-10 | 2011-12-21 | 深圳市核达中远通电源技术有限公司 | Synchronous rectifying circuit |
| CN102291022B (en) * | 2011-08-10 | 2016-08-17 | 深圳市核达中远通电源技术有限公司 | A kind of circuit of synchronous rectification |
| CN108365759A (en) * | 2018-03-30 | 2018-08-03 | 佛山科学技术学院 | A kind of current/voltage converter circuit |
| CN108365759B (en) * | 2018-03-30 | 2024-05-03 | 佛山科学技术学院 | Current/voltage conversion circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110126 Termination date: 20110811 |