CN202513836U - Novel circuit for converting alternating current into direct current - Google Patents
Novel circuit for converting alternating current into direct current Download PDFInfo
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- CN202513836U CN202513836U CN2012201807781U CN201220180778U CN202513836U CN 202513836 U CN202513836 U CN 202513836U CN 2012201807781 U CN2012201807781 U CN 2012201807781U CN 201220180778 U CN201220180778 U CN 201220180778U CN 202513836 U CN202513836 U CN 202513836U
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Abstract
The utility model relates to a novel circuit for converting alternating current into direct current. An alternating current signal is input to a differential amplifying circuit which consists of a thirteen resistor, a first resistor, a first operational amplifier, a fourteenth resistor and a fifteenth resistor, and is divided into two channels to be transmitted; the first channel of signal is transmitted through a reverse phase amplifying circuit which consists of a first rail-to-rail operational amplifier and a third resistor; after being transmitted through a reverse phase amplifying circuit which consists of a second operational amplifier and a sixth resistor, the second channel of signal is transmitted through a reverse phase amplifying circuit which consists of a second rail-to-rail operational amplifier and an eighth resistor; and the signals transmitted in the two channels are composed by an adding circuit which consists of a third operational amplifier, a tenth resistor and a first capacitor to output a direct current signal. A diode is not used in the circuit, and the applicable frequency range of the circuit is wider than that of the conventional precise rectifying circuit; resistance ratios between the resistors in the circuit are not required to be fixed, so that the circuit is easy to debug; and all the operational amplifiers in the circuit adopt the reverse phase amplifying circuits, so that the circuit is high in interference resistance.
Description
Technical field
The utility model relates to the AC-to DC change-over circuit.
Background technology
Fig. 1 is AC-to DC change-over circuit commonly used; Resistance other resistances except that R4 ' require consistent among the figure; And the resistance of R4 ' must be for other resistances half the; The positive-negative half-cycle of the AC signal that only in this way could guarantee to import amplitude after rectification equates, therefore to the debugging of sort circuit trouble.Also there is following shortcoming in foregoing circuit: first; Operational amplifier A 1 ' feedback loop used two semiconductor diode D1, D2 with non-linear characteristics; Its output has voltage jump for the initial conducting voltage that overcomes D2; This will cause electromagnetic interference, therefore needs supporting relative measures to solve electromagnetic interference problem; The second, the parasitic capacitance of D1 and D2 has bigger influence to the high frequency characteristics of circuit, so this circuit is only applicable to low frequency operation.
The utility model content
To the defective of above-mentioned technical problem, it is a kind of applicable to high frequency, the simple and stronger AC-to DC change-over circuit of anti-interference of debugging that the utility model provides.
The technical scheme that the utility model solves the problems of the technologies described above employing is: the differential amplifier circuit that the AC signal input is made up of first operational amplifier, the 14 resistance and the 15 resistance of the 13 resistance, first resistance, dual power supply, and signal is divided into the two-way transmission thereafter; The first via is passed to the see-saw circuit of being made up of the first rail-to-rail operational amplifier and the 3rd resistance of single power supply through second resistance; The second the tunnel be passed to the see-saw circuit of forming by second operational amplifier and the 6th resistance of dual power supply through the 4th resistance after, be passed to the see-saw circuit of forming by the second rail-to-rail operational amplifier and the 8th resistance of single power supply through the 7th resistance again; First via signal, the second road signal are passed to the synthetic back output ripple of the add circuit direct current signal of being made up of the 3rd operational amplifier, the tenth resistance and first electric capacity of dual power supply through the 5th resistance, the 9th resistance respectively after above-mentioned two-way transmission.
As the another kind of mode of the utility model, said pulsating direct current signal is passed to output smoothing direct current signal behind the anti-phase integrating amplification circuit of being made up of four-operational amplifier, the 12 resistance and second electric capacity of dual power supply through the 11 resistance.
Can know that from above technical scheme this circuit does not only use diode, its frequency range that can be suitable for is wider than precise rectification circuit commonly used; Also need not to make in the circuit resistance value ratio between each resistance to keep fixing, so its debugging is simpler; And the operational amplifier in the utility model all adopts see-saw circuit, and it does not receive external interference, and circuit working is stable, can suppress the interference of common-mode voltage, has the better resisting interference performance.
Description of drawings
Fig. 1 is the circuit structure diagram of prior art;
Fig. 2 is the circuit structure diagram of the utility model.
Embodiment
Below in conjunction with Fig. 2 the utility model is done to specify further:
All operational amplifiers all adopt inverting amplifier in the utility model.At first; The differential amplifier circuit that AC signal input is made up of the first operational amplifier 1A, the 14 resistance R 14 and the 15 resistance R 15 of the 13 resistance R 13, first resistance R 1, dual power supply; This differential amplifier circuit can adapt to dissimilar input signals, like voltage or current transformer, shunt resistance signal etc.; Thereafter, signal is divided into two-way and transmits backward; First via signal is passed to the see-saw circuit of being made up of the first rail-to-rail operational amplifier 2A and the 3rd resistance R 3 of single power supply through second resistance R 2; Because of the first rail-to-rail operational amplifier adopts single power supply; It only exports signal at the positive half cycle of input signal Vi, and negative half period is output as zero; After the second road signal is passed to the see-saw circuit of being made up of the second operational amplifier 1B and the 6th resistance R 6 of dual power supply through the 4th resistance R 4; Be passed to the see-saw circuit of forming R8 by the second rail-to-rail operational amplifier 2B and the 8th resistance of single power supply through the 7th resistance R 7 again; The effect of the said second rail-to-rail operational amplifier is the same with the effect of the first rail-to-rail operational amplifier; Because the second road signal has second operational amplifier to the input signal anti-phase; Then the second rail-to-rail operational amplifier is only just exported signal when input signal Vi is former negative half period, and positive half cycle is output as zero; First via signal, the second road signal are passed to the synthetic back output ripple of the add circuit direct current signal of being made up of the 3rd operational amplifier 1C of dual power supply, the tenth resistance R 10 and first capacitor C 1 through the 5th resistance R 5, the 9th resistance R 9 respectively after above-mentioned two-way transmission, this synthetic pulsating direct current signal is the unidirectional pulsating direct current signal of a complete positive-negative half-cycle that comprises input signal.
Another kind of mode as the utility model; Export after can unidirectional pulsating direct current signal being passed to the anti-phase integrating amplification circuit of being made up of four-operational amplifier 1D, the 12 resistance R 12 and second capacitor C 2 of dual power supply through the 11 resistance R 11, it can be the smooth direct current signal with said pulsating direct current conversion of signals.
The utility model utilizes that the input range of rail-to-rail operational amplifier of single power supply is wide can be low to moderate zero characteristics with output voltage swing, only to the voltage amplification of particular polarity, and the voltage of opposite polarity is output as zero.The utility model with the combination of circuits of two rail-to-rail operational amplifiers together; One of them is only amplified the positive half cycle of signal; Another positive half cycle to the input signal after anti-phase amplifies; Just the former negative half period of signal amplifies, output again behind the synthetic complete direct current signal of signal after then this two-way being amplified.This circuit does not only use diode, and suitable frequency range is wider than precise rectification circuit commonly used; Also need not to make in the circuit resistance value ratio between each resistance to keep fixing, so its debugging is simpler.In addition, in the amplification process of whole signal, all operational amplifiers all adopt inverting amplifier, and it does not receive external interference, and circuit working is stable; And the stable performance of inverting amplifier; Input impedance is by gain and feedback resistance decision, so input impedance can be regulated, output impedance is approximately zero; And the input two ends of inverting amplifier are that virtual earth connects method; Virtual earth connects the interference that method can suppress common-mode voltage, and therefore, this circuit has the better resisting interference performance than custom circuit.
Above-mentioned execution mode only supplies to explain the usefulness of the utility model; And be not to be the restriction to the utility model; The those of ordinary skill in relevant technologies field; Under the situation that does not break away from the utility model spirit and scope, can also make various variations and modification, so all technical schemes that are equal to also should belong to the category of the utility model.
Claims (2)
1. novel AC-to DC change-over circuit; It is characterized in that: the differential amplifier circuit that the AC signal input is made up of first operational amplifier, the 14 resistance and the 15 resistance of the 13 resistance, first resistance, dual power supply, signal is divided into the two-way transmission thereafter; The first via is passed to the see-saw circuit of being made up of the first rail-to-rail operational amplifier and the 3rd resistance of single power supply through second resistance; The second the tunnel be passed to the see-saw circuit of forming by second operational amplifier and the 6th resistance of dual power supply through the 4th resistance after, be passed to the see-saw circuit of forming by the second rail-to-rail operational amplifier and the 8th resistance of single power supply through the 7th resistance again; First via signal, the second road signal are passed to the synthetic back output ripple of the add circuit direct current signal of being made up of the 3rd operational amplifier, the tenth resistance and first electric capacity of dual power supply through the 5th resistance, the 9th resistance respectively after above-mentioned two-way transmission.
2. a kind of novel AC-to DC change-over circuit according to claim 1 is characterized in that: said pulsating direct current signal is passed to output smoothing direct current signal behind the anti-phase integrating amplification circuit of being made up of four-operational amplifier, the 12 resistance and second electric capacity of dual power supply through the 11 resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201807781U CN202513836U (en) | 2012-04-25 | 2012-04-25 | Novel circuit for converting alternating current into direct current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201807781U CN202513836U (en) | 2012-04-25 | 2012-04-25 | Novel circuit for converting alternating current into direct current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202513836U true CN202513836U (en) | 2012-10-31 |
Family
ID=47066291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201807781U Withdrawn - After Issue CN202513836U (en) | 2012-04-25 | 2012-04-25 | Novel circuit for converting alternating current into direct current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202513836U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624250A (en) * | 2012-04-25 | 2012-08-01 | 湖南固迅节能科技有限公司 | Novel alternating current-direct current conversion circuit |
| CN103438908A (en) * | 2013-09-11 | 2013-12-11 | 哈尔滨工业大学 | Secondary signal processing circuit of differential transformer sensor |
-
2012
- 2012-04-25 CN CN2012201807781U patent/CN202513836U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624250A (en) * | 2012-04-25 | 2012-08-01 | 湖南固迅节能科技有限公司 | Novel alternating current-direct current conversion circuit |
| CN102624250B (en) * | 2012-04-25 | 2014-09-03 | 湖南固迅节能科技有限公司 | Novel alternating current-direct current conversion circuit |
| CN103438908A (en) * | 2013-09-11 | 2013-12-11 | 哈尔滨工业大学 | Secondary signal processing circuit of differential transformer sensor |
| CN103438908B (en) * | 2013-09-11 | 2015-07-22 | 哈尔滨工业大学 | Secondary signal processing circuit of differential transformer sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121031 Effective date of abandoning: 20140903 |
|
| RGAV | Abandon patent right to avoid regrant |