CN210578285U - High-precision half-wave rectifying circuit - Google Patents
High-precision half-wave rectifying circuit Download PDFInfo
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- CN210578285U CN210578285U CN201921604013.4U CN201921604013U CN210578285U CN 210578285 U CN210578285 U CN 210578285U CN 201921604013 U CN201921604013 U CN 201921604013U CN 210578285 U CN210578285 U CN 210578285U
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Abstract
The utility model discloses a high-accuracy half-wave rectifier circuit, include: the signal input end, the first operational amplifier, the rectification module and the signal output end are connected in sequence; the rectifying module comprises a first diode and a second diode, wherein the anode of the first diode and the cathode of the second diode are connected with the output end of the first operational amplifier, and the cathode of the first diode and the anode of the second diode are connected with the signal output end; and a second operational amplifier is also connected in series between the first operational amplifier and the signal input end, the inverting input end of the second operational amplifier is connected with the signal input end, and the output end of the second operational amplifier is connected with the non-inverting input end of the first operational amplifier. The utility model has reasonable and ingenious structural design and simple structure, and realizes half-wave rectification; the distortion can be reduced by increasing the frequency of the input signal, so that the precision of signal rectification is improved; and the method is suitable for high-frequency signals, and the application range is improved.
Description
Technical Field
The utility model relates to an electronic communication field, concretely relates to high-accuracy half-wave rectifier circuit.
Background
Generally, rectification is generally performed by using a diode, and includes half-wave rectification and full-wave rectification; the half-wave rectification utilizes the unidirectional conductivity of a diode to rectify, and the alternating current is usually converted into direct current; however, because the forward conduction resistance of the diode is large at low voltage, obvious distortion occurs during low-voltage rectification;
the direct current component of the full-wave rectification output voltage is increased relatively to a half wave, the pulsation degree is reduced, but a transformer needs a center tap, and the transformer is troublesome to manufacture.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model discloses a high-accuracy half-wave rectifier circuit.
The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is:
a high-precision half-wave rectifier circuit comprising: the signal input end, the first operational amplifier, the rectification module and the signal output end are connected in sequence; the rectifying module comprises a first diode and a second diode, wherein the anode of the first diode and the cathode of the second diode are connected with the output end of the first operational amplifier, and the cathode of the first diode and the anode of the second diode are both connected with the signal output end; a second operational amplifier is also connected in series between the first operational amplifier and the signal input end, the inverting input end of the second operational amplifier is connected with the signal input end, and the output end of the second operational amplifier is connected with the non-inverting input end of the first operational amplifier.
The signal output end is also connected with a first feedback resistor, and the other end of the first feedback resistor is connected with the inverting input end of the first operational amplifier.
The inverting input terminal of the second operational amplifier is connected to the inverting input terminal of the first operational amplifier.
The second operational amplifier is connected with a first driving power supply, and the first operational amplifier is connected with a second driving power supply.
And the output end of the second operational amplifier and the non-inverting input end of the first operational amplifier are connected in series with a self-excitation prevention resistor.
The same-direction input ends of the first operational amplifier and the second operational amplifier are respectively connected with a first balancing resistor and a second balancing resistor; and the first balance resistor and the second balance resistor are grounded.
The anode of the second diode is connected with a second feedback resistor, and the other end of the second feedback resistor is connected with the inverting input end of the second operational amplifier.
The first diode and the second diode are Schottky barrier diodes.
And the inverting input end of the second operational amplifier is connected with an offset compensation resistor with the same resistance value as the first balance resistor.
The resistance values of the first balance resistor, the offset compensation resistor, the first feedback resistor and the second feedback resistor are all 30 ohms.
The utility model has the advantages that: the utility model has reasonable and ingenious structural design and simple structure, and realizes half-wave rectification through the cooperation of the first operational amplifier, the second operational amplifier, the first diode and the second diode; the distortion can be reduced by increasing the frequency of the input signal, so that the precision of signal rectification is improved; the method is suitable for high-frequency signals, and the application range is improved; through the arrangement of the first feedback resistor, the first operational amplifier can perform feedback regulation to ensure that the voltage is continuously and stably output, and the output stability and the signal rectification precision are improved; in addition, the self-excitation preventing resistor is arranged and connected in series with the non-inverting input end of the first operational amplifier to destroy the self-excitation condition of the first operational amplifier, and further improve the stability.
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
Drawings
Fig. 1 is a schematic diagram of a high-precision half-wave rectifier circuit in an embodiment of the present invention.
Detailed Description
Embodiment, referring to fig. 1, the present embodiment provides a high-precision half-wave rectifier circuit, including: the signal input end, the first operational amplifier, the rectification module and the signal output end are connected in sequence; the rectifying module comprises a first diode and a second diode, wherein the anode of the first diode and the cathode of the second diode are connected with the output end of the first operational amplifier, and the cathode of the first diode and the anode of the second diode are both connected with the signal output end; a second operational amplifier is also connected in series between the first operational amplifier and the signal input end, the inverting input end of the second operational amplifier is connected with the signal input end, and the output end of the second operational amplifier is connected with the non-inverting input end of the first operational amplifier.
Specifically, when Ui input by the signal input end is a positive half cycle of a positive sine wave, the second diode is turned on, the first diode is turned off, and because a signal cannot pass through the second diode, Uo output by the signal output end is 0; when the Ui input by the signal input end is the negative half cycle of the positive sine wave, the first diode is conducted, the second diode is cut off, and because the signal normally passes through the first diode, the Ui input by the signal input end is equal to the Uo output by the signal output end, so that half-wave rectification is realized;
in addition, a second operational amplifier is also connected in series between the first operational amplifier and the signal input end, so that the first operational amplifier U1 and the second operational amplifier U2 are connected in series, so that the output voltage Uo1 of the first operational amplifier U1 is a ═ Uid1dt, and Uid1 is b ═ Uid2dt, wherein Uid2 is the input differential voltage of the second operational amplifier U2, i.e., the voltage between the non-inverting input end and the inverting input end of the second operational amplifier U2, and thus, by the series connection of the first operational amplifier and the second operational amplifier, the amplitude of the Uo 2 at certain times (same amplitude and same frequency) of the Uo1 is far smaller than that at the time of using a single operational amplifier, so that the precision and the frequency of signal rectification are improved, and the frequency of the signal input can be improved; even if the forward on resistance is large, the distortion can be reduced by increasing the frequency of the input signal, so that the precision of signal rectification is improved.
Therefore, the utility model discloses can be applicable to the high frequency signal, and improve the precision of signal rectification, improve the utility model discloses an application scope.
Further, the model of the first operational amplifier is LMH6609 MF/NOPB; the second operational amplifier is model OPA355 NA/3K.
The signal output end is also connected with a first feedback resistor, and the other end of the first feedback resistor is connected with the inverting input end of the first operational amplifier.
Specifically, two ends of the first feedback resistor are respectively connected with the signal output end and the inverting input end of the first operational amplifier, and are actually connected in parallel, so that voltage signals of the section are sampled, and feedback signals are obtained and input into the first operational amplifier;
when the Ui of signal input part input is the negative half cycle of positive mysterious wave, first diode switches on, and the second diode ends, and its output size is adjusted according to this feedback signal to first operational amplifier to guarantee can continuously stabilize output voltage, then improve the utility model discloses an output is stable, then has improved the precision of signal rectification.
The inverting input terminal of the second operational amplifier is connected to the inverting input terminal of the first operational amplifier.
The second operational amplifier is connected with a first driving power supply, and the first operational amplifier is connected with a second driving power supply.
And the output end of the second operational amplifier and the non-inverting input end of the first operational amplifier are connected in series with a self-excitation prevention resistor.
Specifically, since the operational amplifier is capable of self-oscillation in the circuit, the phase and the like of the signal passing therethrough vary; therefore, the self-excitation preventing resistor is arranged and connected in series with the non-inverting input end of the first operational amplifier so as to destroy the self-excitation condition of the first operational amplifier and improve the use stability.
The same-direction input ends of the first operational amplifier and the second operational amplifier are respectively connected with a first balancing resistor and a second balancing resistor; and the first balance resistor and the second balance resistor are grounded.
Specifically, the first and second balance resistors are arranged to keep the first and second operational amplifiers in a balanced state as much as possible, so as to improve the common mode rejection ratio and improve the stability.
The anode of the second diode is connected with a second feedback resistor, and the other end of the second feedback resistor is connected with the inverting input end of the second operational amplifier.
Specifically, like the first feedback resistor, when the Ui input by the signal input terminal is the positive half cycle of the positive ripple, the second diode is turned on, the first diode is turned off, and the second operational amplifier adjusts the output size of the second diode according to the feedback signal, so that the second diode is prevented from being broken down, the service stability is increased, and the service life is prolonged.
The first diode and the second diode are Schottky barrier diodes.
And the inverting input end of the second operational amplifier is connected with an offset compensation resistor with the same resistance value as the first balance resistor. The offset compensation resistor is used for input offset compensation, so that new offset voltage cannot be caused when bias currents of a non-inverting input end and an inverting input end of the second operational amplifier, and the use stability is improved.
The resistance values of the first balance resistor, the offset compensation resistor, the first feedback resistor and the second feedback resistor are all 30 ohms.
When the signal processing device is used, a signal Ui is input to the signal input end, when the Ui input by the signal input end is the positive half cycle of a positive sine wave, the second diode is conducted, the first diode is cut off, and because the signal cannot pass through the second diode, the Uo output by the signal output end is 0; when the Ui input by the signal input end is the negative half cycle of the positive sine wave, the first diode is conducted, the second diode is cut off, and the Ui input by the signal input end is equal to the Uo output by the signal output end because the signal normally passes through the first diode, so that half-wave rectification is completed.
The utility model has reasonable and ingenious structural design and simple structure, and realizes half-wave rectification through the cooperation of the first operational amplifier, the second operational amplifier, the first diode and the second diode; the distortion can be reduced by increasing the frequency of the input signal, so that the precision of signal rectification is improved; the method is suitable for high-frequency signals, and the application range is improved; through the arrangement of the first feedback resistor, the first operational amplifier can perform feedback regulation to ensure that the voltage is continuously and stably output, and the output stability and the signal rectification precision are improved; in addition, the self-excitation preventing resistor is arranged and connected in series with the non-inverting input end of the first operational amplifier to destroy the self-excitation condition of the first operational amplifier, and further improve the stability.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, using the technical means and contents disclosed above, without departing from the scope of the technical solution of the present invention. Therefore, the equivalent changes made according to the shape, structure and principle of the present invention should be covered in the protection scope of the present invention.
Claims (10)
1. A high-precision half-wave rectifier circuit, comprising: the signal input end, the first operational amplifier, the rectification module and the signal output end are connected in sequence;
the rectifying module comprises a first diode and a second diode, wherein the anode of the first diode and the cathode of the second diode are connected with the output end of the first operational amplifier, and the cathode of the first diode and the anode of the second diode are both connected with the signal output end;
a second operational amplifier is also connected in series between the first operational amplifier and the signal input end, the inverting input end of the second operational amplifier is connected with the signal input end, and the output end of the second operational amplifier is connected with the non-inverting input end of the first operational amplifier.
2. The high-precision half-wave rectifier circuit according to claim 1, wherein said signal output terminal is further connected to a first feedback resistor, and the other end of said first feedback resistor is connected to the inverting input terminal of said first operational amplifier.
3. The high-precision half-wave rectifier circuit according to claim 1, wherein an inverting input terminal of said second operational amplifier is connected to an inverting input terminal of said first operational amplifier.
4. The high-precision half-wave rectifier circuit according to claim 3, wherein said second operational amplifier is connected to a first drive power supply, and said first operational amplifier is connected to a second drive power supply.
5. The high-precision half-wave rectifier circuit according to claim 3, wherein the output terminal of said second operational amplifier is connected in series with the non-inverting input terminal of the first operational amplifier with a self-excitation preventing resistor.
6. The high-precision half-wave rectifier circuit according to claim 5, wherein the first and second operational amplifiers have their inputs in the same direction connected to first and second balance resistors, respectively;
and the first balance resistor and the second balance resistor are grounded.
7. The high-precision half-wave rectifier circuit according to claim 2, wherein a second feedback resistor is connected to an anode of said second diode, and the other end of said second feedback resistor is connected to an inverting input terminal of said second operational amplifier.
8. The high-precision half-wave rectifier circuit according to claim 1, wherein said first diode and said second diode are schottky barrier diodes.
9. The half-wave rectifier circuit of claim 6, wherein the inverting input terminal of said second operational amplifier is connected to an offset compensation resistor having the same resistance as said first balancing resistor.
10. The half-wave rectifier circuit of claim 9, wherein the first balance resistor, the offset compensation resistor, the first feedback resistor, and the second feedback resistor have a resistance of 30 ohms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921604013.4U CN210578285U (en) | 2019-09-25 | 2019-09-25 | High-precision half-wave rectifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921604013.4U CN210578285U (en) | 2019-09-25 | 2019-09-25 | High-precision half-wave rectifying circuit |
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| Publication Number | Publication Date |
|---|---|
| CN210578285U true CN210578285U (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921604013.4U Active CN210578285U (en) | 2019-09-25 | 2019-09-25 | High-precision half-wave rectifying circuit |
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|---|---|
| CN (1) | CN210578285U (en) |
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2019
- 2019-09-25 CN CN201921604013.4U patent/CN210578285U/en active Active
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