CN220305409U - High-precision voltage conversion circuit - Google Patents
High-precision voltage conversion circuit Download PDFInfo
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- CN220305409U CN220305409U CN202321769933.8U CN202321769933U CN220305409U CN 220305409 U CN220305409 U CN 220305409U CN 202321769933 U CN202321769933 U CN 202321769933U CN 220305409 U CN220305409 U CN 220305409U
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- operational amplifier
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- diode
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 24
- 238000005259 measurement Methods 0.000 abstract description 14
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model provides a high-precision voltage conversion circuit, which forms voltage feedback with a diode through the arrangement of operational amplifiers U1 and U2, so that dead zone of the diode is eliminated, the measurement is accurate no matter a large signal effective value or a small signal effective value, the error is small, the temperature characteristic is greatly improved, the measurement precision is improved, the measurement error is reduced, the measurement signal can be infinitely small, no dead zone voltage exists, and the measured direct current voltage value is more stable.
Description
Technical Field
The utility model relates to the technical field of circuit design, in particular to a high-precision voltage conversion circuit.
Background
The circuit for converting the effective value into the direct current value changes the sine wave alternating current voltage signal into the direct current voltage signal, a plurality of electronic measuring devices need to use the circuit for converting the effective value into the direct current value, most of the current circuits for converting the effective value into the direct current value have larger measuring errors, lower precision and poor temperature characteristics, and particularly when the detected effective value signal is smaller, the common circuit for converting the effective value into the direct current value can not recognize the effective value signal at all, because the diode has a junction voltage drop, the junction voltage drop is about 0.7V, the diode can not be conducted when the signal is smaller than 0.7V, namely the diode enters a dead zone, and the small signal effective value can not be converted into the direct current value.
Disclosure of Invention
In view of this, the technical problems to be solved by the present utility model are: how to provide a high-precision voltage conversion circuit to improve the measurement precision and reduce the measurement error so that the measured direct-current voltage value is more stable.
In order to achieve the above object, the present utility model provides a high-precision voltage conversion circuit including:
the left side of the circuit is input with an alternating voltage signal, namely an effective value signal, and the effective value signal directly enters into the 3 pins and the 5 pins of the two non-inverting input ends of the two calculation amplifiers U1;
the pin 2 of the operational amplifier U1 is connected with the anode of the diode D2 and one end of the resistor R2, the pin 2 of the inverting input end of the operational amplifier U2,
the 6 pin of the operational amplifier U1 is connected with the cathode of the diode D1 and one end of the resistor R1, the non-inverting input terminal 3 pin of the operational amplifier U2,
one end of an 8-pin connection capacitor C1 of the operational amplifier U1 is connected to a positive power supply, and the other end of the capacitor C1 is grounded;
one end of a pin 4 of the operational amplifier U1 is connected with a capacitor C2 and is connected with a negative power supply, and the other end of the capacitor C2 is grounded;
an output end 7 pin of the operational amplifier U1 is connected with the anode of the diode D1;
the other output end 1 pin of the operational amplifier U1 is connected with the cathode of the diode D2;
the other ends of the pull-down resistors R1 and R2 are grounded;
one end of a pin 7 of the operational amplifier U2 is connected with a capacitor C3 and is connected to a positive power supply, and the other end of the capacitor C3 is grounded;
one end of a pin 4 of the operational amplifier U2 is connected with a capacitor C4 and is connected with a negative power supply, and the other end of the capacitor C4 is grounded;
the 1 pin and the 8 pin of the operational amplifier U2 are respectively connected with two ends of the gain resistor RG;
the 5 pin of the operational amplifier U2 is grounded;
the 6 pin of the operational amplifier U2 is a DC value output terminal.
Further, the gain resistor RG is an adjustable gain resistor.
Further, the operational amplifier U2 is an instrumentation amplifier AD620.
Further, the operational amplifier U1 is an AD822.
Compared with the related art, the high-precision voltage conversion circuit provided by the utility model has the beneficial effects that: through the arrangement of the operational amplifiers U1 and U2, the voltage feedback is formed with the diode, so that the dead zone of the diode is eliminated, the measurement can be accurate no matter the effective value of a large signal or the effective value of a small signal, the error is small, the temperature characteristic is greatly improved, the measurement precision can be improved, the measurement error is reduced, the measurement signal can be infinitely small, no dead zone voltage exists, and the measured direct current voltage value is more stable.
Drawings
Fig. 1 is a schematic diagram of a high-precision voltage conversion circuit according to an embodiment of the utility model.
Detailed Description
The utility model is described in further detail below with reference to the drawings and the detailed description.
Referring to fig. 1, the present utility model provides a high-precision voltage conversion circuit, which includes:
the left side of the circuit is input with alternating voltage signals, namely input with effective value signals, and the effective value signals directly enter the 3 pins and the 5 pins of the two non-inverting input ends of the two calculation amplifiers U1.
The 2 pin of the operational amplifier U1 is connected with the anode of the diode D2 and one end of the resistor R2, and the 2 pin of the inverting input end of the operational amplifier U2.
The 6 pin of the operational amplifier U1 is connected with the cathode of the diode D1 and one end of the resistor R1, and the non-inverting input terminal 3 pin of the operational amplifier U2.
One end of the 8-pin connection capacitor C1 of the operational amplifier U1 is connected to a positive power supply, and the other end of the capacitor C1 is grounded.
One end of a 4-pin connection capacitor C2 of the operational amplifier U1 is connected to a negative power supply, and the other end of the capacitor C2 is grounded.
An output terminal 7 of the operational amplifier U1 is connected to the anode of the diode D1.
The other output terminal 1 pin of the operational amplifier U1 is connected with the cathode of the diode D2.
The other ends of the pull-down resistors R1 and R2 are grounded, so that the non-inverting input end and the inverting input end of the operational amplifier U2 are prevented from being in a suspended state in the working process.
One end of a pin 7 of the operational amplifier U2 is connected with a capacitor C3 and is connected to a positive power supply, and the other end of the capacitor C3 is grounded.
One end of a 4-pin connection capacitor C4 of the operational amplifier U2 is connected to a negative power supply, and the other end of the capacitor C4 is grounded.
The 1 pin and the 8 pin of the operational amplifier U2 are respectively connected with two ends of the gain resistor RG.
The 5 pin of the operational amplifier U2 is grounded.
The 6 pin of the operational amplifier U2 is a DC value output terminal.
Further, the gain resistor RG is an adjustable gain resistor.
Further, the operational amplifier U2 is an instrumentation amplifier AD620.
Further, the operational amplifier U1 is AD822.
Through the arrangement of the operational amplifiers U1 and U2, the voltage feedback is formed with the diode, so that the dead zone of the diode is eliminated, the measurement can be accurate no matter the effective value of a large signal or the effective value of a small signal, the error is small, the temperature characteristic is greatly improved, the measurement precision can be improved, the measurement error is reduced, the measurement signal can be infinitely small, no dead zone voltage exists, and the measured direct current voltage value is more stable.
Finally, it should be noted that: the above embodiments are intended to illustrate the technical solution of the present utility model, but not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (4)
1. A high precision voltage conversion circuit, comprising:
the left side of the circuit is input with an alternating voltage signal, namely an effective value signal, and the effective value signal directly enters into the 3 pins and the 5 pins of the two non-inverting input ends of the two calculation amplifiers U1;
the pin 2 of the operational amplifier U1 is connected with the anode of the diode D2 and one end of the resistor R2, the pin 2 of the inverting input end of the operational amplifier U2,
the 6 pin of the operational amplifier U1 is connected with the cathode of the diode D1 and one end of the resistor R1, the non-inverting input terminal 3 pin of the operational amplifier U2,
one end of an 8-pin connection capacitor C1 of the operational amplifier U1 is connected to a positive power supply, and the other end of the capacitor C1 is grounded;
one end of a pin 4 of the operational amplifier U1 is connected with a capacitor C2 and is connected with a negative power supply, and the other end of the capacitor C2 is grounded;
an output end 7 pin of the operational amplifier U1 is connected with the anode of the diode D1;
the other output end 1 pin of the operational amplifier U1 is connected with the cathode of the diode D2;
the other ends of the pull-down resistors R1 and R2 are grounded;
one end of a pin 7 of the operational amplifier U2 is connected with a capacitor C3 and is connected to a positive power supply, and the other end of the capacitor C3 is grounded;
one end of a pin 4 of the operational amplifier U2 is connected with a capacitor C4 and is connected with a negative power supply, and the other end of the capacitor C4 is grounded;
the 1 pin and the 8 pin of the operational amplifier U2 are respectively connected with two ends of the gain resistor RG;
the 5 pin of the operational amplifier U2 is grounded;
the 6 pin of the operational amplifier U2 is a DC value output terminal.
2. The high-precision voltage converting circuit according to claim 1, wherein the gain resistor RG is an adjustable gain resistor.
3. The high-precision voltage converting circuit according to claim 1, wherein the operational amplifier U2 is an instrumentation amplifier AD620.
4. The high precision voltage converting circuit according to claim 1, wherein the operational amplifier U1 is an AD822.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321769933.8U CN220305409U (en) | 2023-07-07 | 2023-07-07 | High-precision voltage conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321769933.8U CN220305409U (en) | 2023-07-07 | 2023-07-07 | High-precision voltage conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220305409U true CN220305409U (en) | 2024-01-05 |
Family
ID=89372121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321769933.8U Active CN220305409U (en) | 2023-07-07 | 2023-07-07 | High-precision voltage conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220305409U (en) |
-
2023
- 2023-07-07 CN CN202321769933.8U patent/CN220305409U/en active Active
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