CN220798221U - Effective value conversion circuit based on operational amplifier - Google Patents
Effective value conversion circuit based on operational amplifier Download PDFInfo
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- CN220798221U CN220798221U CN202322448433.0U CN202322448433U CN220798221U CN 220798221 U CN220798221 U CN 220798221U CN 202322448433 U CN202322448433 U CN 202322448433U CN 220798221 U CN220798221 U CN 220798221U
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- operational amplifier
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model belongs to the design technology of aero-generator controllers, and relates to an effective value conversion circuit based on an operational amplifier; the circuit comprises an inverse input proportional amplifying circuit (1), an adder circuit (2) and a filter circuit (3); compared with a common rectifying circuit, the effective value conversion circuit based on the operational amplifier utilizes the high gain characteristic and the deep negative feedback function of the operational amplifier to improve the nonlinearity of a diode and the signal distortion caused by starting voltage, and connects the rectifying diode in a feedback loop of the operational amplifier, so that the diode can be conducted or cut off as long as the signal is slightly changed, the loss of the signal on the voltage drop of the rectifying diode is much smaller than that of the common rectifying circuit, and the reliability of the circuit is improved.
Description
Technical Field
The utility model belongs to the design technology of aero-generator controllers, and relates to an effective value conversion circuit based on an operational amplifier.
Background
At present, the effective value is measured mostly by utilizing unidirectional conductivity of a diode to form a rectifying circuit, for example, a bridge rectifying circuit rectifies an alternating current signal into a direct current signal, and because of the inherent influence of starting voltage of the diode, larger errors can be generated when the input voltage is lower, and the reliability of the circuit is affected.
The effective value conversion circuit based on the operational amplifier is a high-precision rectifier, compared with a general rectifying circuit, the high-gain characteristic and the deep negative feedback function of the operational amplifier are utilized to improve the nonlinearity of a diode and the signal distortion caused by the starting voltage, the rectifying diode is connected in a feedback loop of the operational amplifier, and the diode can be turned on or turned off as long as the signal is slightly changed, so that the loss of the signal on the voltage drop of the rectifying diode is much smaller than that of the general rectifying circuit, and the reliability of the circuit is improved.
Disclosure of Invention
The purpose of the utility model is that:
the utility model provides an effective value conversion circuit based on an operational amplifier, aiming at the defect that a rectifier circuit is formed by utilizing unidirectional conductivity of a diode.
The technical scheme of the utility model is as follows:
an operational amplifier-based effective value conversion circuit, characterized in that: the circuit comprises an inverse input proportion amplifying circuit 1, an adder circuit 2 and a filter circuit 3;
the reverse input proportional amplifying circuit 1 comprises an alternating input voltage Vin, an operational amplifier U1, a rectifier diode D2, an input side resistor R1 and a feedback resistor R3; the alternating current input voltage Vin is connected to the negative input end of the operational amplifier U1 through a resistor R1; the positive input end of the operational amplifier U1 is grounded; the output end of the operational amplifier U1 is respectively connected with the anode of the diode D1 and the cathode of the diode D2; the cathode of the diode D1 is connected to the negative input end of the operational amplifier; the anode of the diode D2 is connected to the negative input end of the operational amplifier U1 through a resistor R3;
the adder circuit 2 comprises a direct-current voltage input Vout1, an alternating-current voltage input Vin, an operational amplifier U2, an input resistor R4 and a feedback resistor R5; the alternating current input voltage Vin is connected to the negative input end of the operational amplifier through an input resistor R2; the direct current input voltage Vout1 is connected to the negative input end of the amplifier through an input resistor R4; the positive input end of the operational amplifier U2 is grounded; the output end of the operational amplifier U2 is connected to the negative input end of the operational amplifier U2 through a feedback resistor R5;
the filter circuit 3 comprises an operational amplifier U3, an input resistor R6, a filter capacitor C1 and a resistor R7; the direct current input voltage Vout2 is connected to the positive input end of the operational amplifier U3 through an input resistor R6; a filter capacitor C1 is connected between the input voltage Vout2 and the output voltage Vout; one end of the resistor R7 is connected to the negative input end of the operational amplifier U3, and the other end is connected to the output end, and the output voltage Vout of the output end is an effective value of the alternating current input voltage Vin.
The resistors R1, R2, R3, R4, R5, R6 and R7 are high-stability precise resistors.
The operational amplifier U3 supplies power for +/-15V power supply.
The operational amplifier U3 is a low-power-consumption four-path operational amplifier.
The rectifying diodes D1 and D2 are selected according to the magnitude of the input voltage Vin.
The filter circuit 3 is a first order low pass filter circuit with a frequency selection function.
The utility model has the advantages that:
the utility model provides an effective value conversion circuit based on an operational amplifier. Compared with a common rectifying circuit, the effective value conversion circuit based on the operational amplifier utilizes the high gain characteristic and the deep negative feedback function of the operational amplifier to improve the nonlinearity of a diode and the signal distortion caused by starting voltage, and the rectifying diode is connected in a feedback loop of the operational amplifier, so that the diode can be conducted or cut off as long as the signal is slightly changed, the loss of the signal on the voltage drop of the rectifying diode is much smaller than that of the common rectifying circuit, and the reliability of the circuit is improved.
Drawings
Fig. 1 is a schematic circuit diagram of the present utility model.
Detailed Description
The present utility model will be described in further detail below. Referring to fig. 1, the proposed operational amplifier based effective value conversion circuit is characterized in that: the circuit comprises a 1 reverse input proportional amplifying circuit, a 2 adder circuit and a 3 filtering circuit;
the reverse input proportional amplifying circuit 1 comprises an alternating input voltage Vin; an operational amplifier U1; rectifier diodes D1, D2; input side resistor R1 and feedback resistor R3. The alternating current input voltage Vin is connected to the negative input end of the operational amplifier U1 through a resistor R1; the positive input end of the operational amplifier U1 is grounded; the output end of the operational amplifier U1 is respectively connected with the anode of the diode D1 and the cathode of the diode V2; the cathode of the diode D1 is connected to the negative input end of the operational amplifier; the anode of diode D2 is connected to the negative input of op amp U1 through resistor R3.
The adder circuit 2 includes a dc voltage input Vout1; an ac voltage input Vin; an operational amplifier U2; input resistors R2, R4; and a feedback resistor R5. The alternating current input voltage Vin is connected to the negative input end of the operational amplifier through an input resistor R2; the direct current input voltage Vout1 is connected to the negative input end of the amplifier through an input resistor R4; the positive input end of the operational amplifier U2 is grounded; the output of the operational amplifier U2 is connected to the negative input of the operational amplifier U2 through a feedback resistor R5.
The filter circuit 3 comprises an operational amplifier U3; an input resistor R6; a filter capacitor C1 and a resistor R7. The direct current input voltage Vout2 is connected to the positive input end of the operational amplifier U3 through an input resistor R6; the operational amplifier supplies power for a + -15V power supply; a filter capacitor C1 is connected between the input voltage Vout2 and the output voltage Vout; one end of the resistor R7 is connected to the negative input end of the operational amplifier U3, one end is connected to the output end, and the output end Vout is an effective value of the alternating current input voltage Vin.
The working principle of the utility model is as follows:
when the ac input voltage Vin signal is positive, the output voltage V1 of U1 is negative, the diode D1 is reverse biased, D2 is forward biased, and an inverting amplifier is formed through the feedback loop, so v2= -Vin. The operational amplifier U2 adds V2 with-2 times gain and Vin with-1 times gain as input signals to obtain a Vin signal (v3= -2×v2+ -1×vin=2 Vin-vin=vin) with a net gain of 1 times, and generates a positive output signal.
When the ac input voltage Vin signal is negative, the output voltage V1 of U1 is positive, the diode D1 is forward biased, and the diode D2 is reverse biased, and at this time, the diode D2 is not turned on, and the operational amplifier U2 uses Vin multiplied by-1 times the gain as the input signal, so as to obtain a Vin signal (v3= -1×vin= -Vin) with a net gain of 1 times, and generate a positive output signal.
The filter circuit 3 is a first-order low-pass filter circuit with a frequency selection function, which is composed of an RC element and an operational amplifier, and is used for filtering out unwanted frequency components in the signal. The operational amplifier has the characteristics of high open loop gain, high input resistance and low output resistance, so that the filter can provide a certain gain and play a role of buffering.
One embodiment of the utility model: the input AC power voltage is 100.4ACV, the input resistor R1 is 10KΩ, R2 is 20KΩ, R4 is 10KΩ, the feedback resistor R3 is 10KΩ, and R5 is 20KΩ. The effective value of the circuit output is 2.487V through calculation and theoretical effective value is 2.486V.
After the circuit is adopted, the voltage of the effective value can be accurately measured through test verification.
Claims (6)
1. An operational amplifier-based effective value conversion circuit, characterized in that: the circuit comprises an inverse input proportional amplifying circuit (1), an adder circuit (2) and a filter circuit (3);
the reverse input proportional amplifying circuit (1) comprises an alternating input voltage Vin, an operational amplifier U1, a rectifier diode D2, an input side resistor R1 and a feedback resistor R3; the alternating current input voltage Vin is connected to the negative input end of the operational amplifier U1 through a resistor R1; the positive input end of the operational amplifier U1 is grounded; the output end of the operational amplifier U1 is respectively connected with the anode of the diode D1 and the cathode of the diode D2; the cathode of the diode D1 is connected to the negative input end of the operational amplifier; the anode of the diode D2 is connected to the negative input end of the operational amplifier U1 through a resistor R3;
the adder circuit (2) comprises a direct-current voltage input Vout1, an alternating-current voltage input Vin, an operational amplifier U2, an input resistor R4 and a feedback resistor R5; the alternating current input voltage Vin is connected to the negative input end of the operational amplifier through an input resistor R2; the direct current input voltage Vout1 is connected to the negative input end of the amplifier through an input resistor R4; the positive input end of the operational amplifier U2 is grounded; the output end of the operational amplifier U2 is connected to the negative input end of the operational amplifier U2 through a feedback resistor R5;
the filter circuit (3) comprises an operational amplifier U3, an input resistor R6, a filter capacitor C1 and a resistor R7; the direct current input voltage Vout2 is connected to the positive input end of the operational amplifier U3 through an input resistor R6; a filter capacitor C1 is connected between the input voltage Vout2 and the output voltage Vout; one end of the resistor R7 is connected to the negative input end of the operational amplifier U3, and the other end is connected to the output end, and the output voltage Vout of the output end is an effective value of the alternating current input voltage Vin.
2. The operational amplifier-based effective value conversion circuit according to claim 1, wherein: the resistors R1, R2, R3, R4, R5, R6 and R7 are high-stability precise resistors.
3. The operational amplifier-based effective value conversion circuit according to claim 1, wherein: the operational amplifier U3 supplies power for +/-15V power supply.
4. The operational amplifier-based effective value conversion circuit according to claim 1, wherein: the operational amplifier U3 is a low-power-consumption four-path operational amplifier.
5. The operational amplifier-based effective value conversion circuit according to claim 1, wherein: the rectifying diodes D1 and D2 are selected according to the magnitude of the input voltage Vin.
6. The operational amplifier-based effective value conversion circuit according to claim 1, wherein: the filter circuit (3) is a first order low pass filter circuit with a frequency selection function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322448433.0U CN220798221U (en) | 2023-09-08 | 2023-09-08 | Effective value conversion circuit based on operational amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322448433.0U CN220798221U (en) | 2023-09-08 | 2023-09-08 | Effective value conversion circuit based on operational amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220798221U true CN220798221U (en) | 2024-04-16 |
Family
ID=90633253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322448433.0U Active CN220798221U (en) | 2023-09-08 | 2023-09-08 | Effective value conversion circuit based on operational amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220798221U (en) |
-
2023
- 2023-09-08 CN CN202322448433.0U patent/CN220798221U/en active Active
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