CN219627678U - Voltage-controlled AC circuit with feedback - Google Patents
Voltage-controlled AC circuit with feedback Download PDFInfo
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- CN219627678U CN219627678U CN202321029353.5U CN202321029353U CN219627678U CN 219627678 U CN219627678 U CN 219627678U CN 202321029353 U CN202321029353 U CN 202321029353U CN 219627678 U CN219627678 U CN 219627678U
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- feedback
- operational amplifier
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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 discloses a voltage-controlled AC circuit with feedback, which comprises a power supply module, a voltage-controlled amplifying module, an amplifying circuit, an operational amplifier control loop and an operational amplifier feedback loop. The DC voltage control is adopted, the control is convenient and accurate, finer control can be realized, and the precision and reliability of output signals are further improved. The operational amplifier comparison and amplification circuit, the voltage-controlled operational amplifier adjustment circuit and other hardware circuits are adopted, and the operational amplifier has the advantages of simple structure, convenience in use, strong adaptability in all aspects and the like.
Description
Technical Field
The utility model relates to an amplifying circuit, in particular to a voltage-controlled AC circuit with feedback.
Background
The amplifying circuit in the prior art adopts a voltage-controlled gain amplifier chip or a four-quadrant multiplication circuit to be commonly used in a signal processing and control circuit, and can realize the functions of amplifying and modulating signals and the like. This scheme is deficient mainly in terms of linearity and output signal affected by the subsequent stage circuits. First, the linearity of these circuits is relatively poor, i.e. the gain of the output signal changes when the input signal changes. This is because the gain of these circuits is achieved by adjusting the ratio between the input signal and the output signal, which is affected by the parameter variation of the circuit elements and environmental factors such as temperature, resulting in unstable gain variation. Second, the output signals of these circuits are susceptible to various aspects of the subsequent circuits, resulting in undesirable output signals. For example, when an output signal is transmitted to a next stage circuit, if the next stage circuit is affected by temperature or other aspects, etc., stability and quality of the output signal are affected. Therefore, when high precision and high stability of the output signal is required, the use of a voltage controlled gain amplifier chip or a four-quadrant multiplication circuit may not be ideal, and a more stable and accurate signal processing circuit is required.
Disclosure of Invention
The utility model aims to provide a voltage-controlled AC circuit with feedback.
In order to achieve the above purpose, the utility model is implemented according to the following technical scheme:
the utility model comprises a power supply module, a voltage-controlled amplifying module, an amplifying circuit, an operational amplifier control loop and an operational amplifier feedback loop, wherein the power supply output end of the power supply module is respectively connected with the power supply input ends of the operational amplifier control loop, the operational amplifier feedback loop, the voltage-controlled amplifying module and the amplifying circuit, the signal input end of the operational amplifier control loop is connected with a direct-current (DC) voltage-controlled signal, the DC feedback signal output end of the operational amplifier control loop is connected with the feedback signal input end of the voltage-controlled amplifying module, the signal input end of the voltage-controlled amplifying module is connected with an alternating-current (AC) waveform reference signal, the control signal output end of the voltage-controlled amplifying module is connected with the amplifying circuit, the signal output end of the amplifying circuit is connected with the feedback signal input end of the operational amplifier control loop through the operational amplifier feedback loop.
The operational amplifier feedback loop comprises resistors R1, R2, R3, R6, R9, diodes D1 and D3, and feedback chips U3.1 and U3.2, wherein one end of the resistor R6 is connected with an AC feedback signal output end of a signal output interface, the other end of the resistor R6 is simultaneously connected with a second pin of the feedback chip U3.1, a first end of the resistor R1 and a first end of the resistor R9, the first pin of the feedback chip U3.1 is simultaneously connected with a negative electrode of the diode D1 and a positive electrode of the diode D3, the second end of the resistor R1 is simultaneously connected with a first end of the resistor R2 and a positive electrode of the diode D1, the second end of the resistor R9 is simultaneously connected with a negative electrode of the diode D3 and a 5 th pin of the feedback chip U3.2, a 6 th pin of the feedback chip U3.2 is simultaneously connected with a second end of the resistor R2 and a first end of the resistor R3, and the second end of the resistor R3 is simultaneously connected with a first end of the feedback chip U3.2, and the second end of the resistor R3 is simultaneously connected with a first end of the feedback chip U3.7.
The operational amplifier control loop comprises resistors R4, R5, R7, R8, diodes D2 and D4, operational amplifier chips U2.1 and capacitors C1 and C2, wherein the first end of the resistor R4 is connected with the 7 th pin of the U3.2 of the feedback chip, the first end of the resistor R7 is connected with a direct-current DC voltage-controlled signal, the second end of the resistor R4 is simultaneously connected with the 2 nd pin of the operational amplifier chips U2.1 and the first end of the capacitor C1, the second end of the resistor R7 is simultaneously connected with the first end of the capacitor C2 and the 3 rd pin of the operational amplifier chips U2.1, the second end of the capacitor C2 is simultaneously connected with the anode of the diode D2, the first end of the resistor R5 is connected with the voltage-controlled amplification module, the 1 st pin of the operational amplifier chips U2.1 is connected with the first end of the resistor R8, the second end of the resistor R8 is simultaneously connected with the anode of the diode D2 and the cathode of the diode D4, and the anode of the diode D4 is connected with the anode of the diode D4.
The voltage-controlled amplifying module comprises a voltage-controlled chip U1, resistors R10, R11, R12, R13, R14, R15 and an amplifying chip U4.1, wherein pins 3 and 6 of the voltage-controlled chip U1 are connected with an Alternating Current (AC) waveform reference signal, pin 2 of the voltage-controlled chip U1 is connected with a first end of a resistor R5, pins 4 and 5 of the voltage-controlled chip U1 are connected with two ends of a resistor R10, pins 1 and 14 of the voltage-controlled chip U1 are connected with a positive electrode of a power supply, pins 7 and 8 of the voltage-controlled chip U1 are connected with a negative electrode of the power supply, pin 12 of the voltage-controlled chip U1 is connected with a first end of a resistor R11, pin 10 of the voltage-controlled chip U1 is simultaneously connected with a second end of a resistor R11 and a first end of a resistor R13, pin 11 of the voltage-controlled chip U1 is simultaneously connected with a second end of a resistor R12, a first end of a resistor R14 and a negative electrode of the power supply, a second end of a resistor R13 is connected with a second end of the voltage-controlled chip U1, and a first end of a resistor R14 is simultaneously connected with a first end of a resistor R1 and a first end of a resistor R15, and a first end of a circuit of the amplifier U1 is simultaneously connected with a second end of the resistor R1 and a first end of the resistor 1.
The digital adjustable hardware feedback type voltage-controlled AC circuit adopts an analog physical feedback principle, specifically, an AC voltage output end is directly fed back to a feedback loop, a stable DC voltage signal generated by a DAC (digital-to-analog converter) or a DAC chip is output to a control loop, and then the AC voltage signal is regulated and output in real time by hardware circuits such as an operational amplifier, a voltage-controlled element and the like in the feedback loop.
Specifically, the output signal of the operational amplifier is directly fed back to a rectifying circuit formed by the operational amplifier through an output end, and is connected with the feedback end of the operational amplifier. The signal amplified by the AC reference signal is controlled by the voltage-controlled element and the operational amplifier adjusting circuit, so that the output voltage can be effectively adjusted. Through the output end feedback, the output voltage can be accurately regulated, so that high-precision cable testing is realized.
Meanwhile, the control part of the utility model adopts a singlechip DAC or DAC chip to provide a stable DC voltage signal to output to the control loop, and the waveform of the output alternating current AC is generated by the positive-brown wave resonant circuit and output to the positive and negative input ends of the voltage-controlled operational amplifier, thereby ensuring the integrity of the waveform of the output positive-brown AC voltage. Meanwhile, the output voltage can be quickly and accurately adjusted, and the testing precision and reliability are improved.
The beneficial effects of the utility model are as follows:
compared with the prior art, the utility model adopts hardware feedback, has high system stability, can effectively inhibit the influence of external environment and various factors on the circuit, and is suitable for circuits taking various alternating currents as signal sources. The DC voltage control is adopted, the control is convenient and accurate, finer control can be realized, and the precision and reliability of output signals are further improved. The operational amplifier comparison and amplification circuit, the voltage-controlled operational amplifier adjustment circuit and other hardware circuits are adopted, and the operational amplifier has the advantages of simple structure, convenience in use, strong adaptability in all aspects and the like.
Drawings
FIG. 1 is a schematic block diagram of the circuit architecture of the present utility model;
FIG. 2 is a circuit diagram of an operational amplifier feedback loop of the present utility model;
FIG. 3 is a circuit diagram of an operational amplifier control loop of the present utility model;
fig. 4 is a circuit diagram of a voltage controlled amplification module of the present utility model.
Description of the embodiments
The utility model will be further described with reference to the accompanying drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the utility model are for purposes of illustration, but are not intended to be limiting.
As shown in fig. 1: the utility model comprises a power supply module, a voltage-controlled amplifying module, an amplifying circuit, an operational amplifier control loop and an operational amplifier feedback loop, wherein the power supply output end of the power supply module is respectively connected with the power supply input ends of the operational amplifier control loop, the operational amplifier feedback loop, the voltage-controlled amplifying module and the amplifying circuit, the signal input end of the operational amplifier control loop is connected with a direct-current (DC) voltage-controlled signal, the DC feedback signal output end of the operational amplifier control loop is connected with the feedback signal input end of the voltage-controlled amplifying module, the signal input end of the voltage-controlled amplifying module is connected with an alternating-current (AC) waveform reference signal, the control signal output end of the voltage-controlled amplifying module is connected with the amplifying circuit, the signal output end of the amplifying circuit is connected with the feedback signal input end of the operational amplifier control loop through the operational amplifier feedback loop.
The main function of the power supply module is to provide electric energy for all the partial circuits and ensure the normal operation of the system. In the present utility model, 2 voltage types are used as follows:
the positive and negative DC15V power supply mainly provides operational amplifiers of all parts as input;
the positive and negative DC5V power supplies mainly provide voltage-controlled operational amplifier power supply;
the operational amplifier feedback loop is used for directly feeding back and sampling (or sampling in other modes such as resistor-array voltage division feedback, transformer feedback and the like) by an output end, and active full-wave rectification is based on the operational amplifier. The operational amplifier control loop is mainly realized by positive and negative feedback comparison formed by operational amplifiers. The voltage-controlled amplifying module is mainly composed of a high-speed voltage control device (low cost), or a four-quadrant multiplier can be used. The amplifying circuit mainly provides gain for the load. Through the four parts, the system works and is in a closed-loop control state, and stable and accurate AC output is finally realized.
As shown in fig. 2: the operational amplifier feedback loop comprises resistors R1, R2, R3, R6, R9, diodes D1 and D3, and feedback chips U3.1 and U3.2, wherein one end of the resistor R6 is connected with an AC feedback signal output end of a signal output interface, the other end of the resistor R6 is simultaneously connected with a second pin of the feedback chip U3.1, a first end of the resistor R1 and a first end of the resistor R9, the first pin of the feedback chip U3.1 is simultaneously connected with a negative electrode of the diode D1 and a positive electrode of the diode D3, the second end of the resistor R1 is simultaneously connected with a first end of the resistor R2 and a positive electrode of the diode D1, the second end of the resistor R9 is simultaneously connected with a negative electrode of the diode D3 and a 5 th pin of the feedback chip U3.2, a 6 th pin of the feedback chip U3.2 is simultaneously connected with a second end of the resistor R2 and a first end of the resistor R3, and the second end of the resistor R3 is simultaneously connected with a first end of the feedback chip U3.2, and the second end of the resistor R3 is simultaneously connected with a first end of the feedback chip U3.7.
An operational amplifier is a high gain, differential input, single ended output electronic amplifier. In the utility model, the operational amplifier is used for processing the feedback signal to realize the stability and adjustability of the voltage output, and in the utility model, in order to ensure the voltage adjustment precision and the corresponding speed, a high-speed zero drift operational amplifier MAX44248 is adopted.
As shown in fig. 3: the operational amplifier control loop comprises resistors R4, R5, R7, R8, diodes D2 and D4, operational amplifier chips U2.1 and capacitors C1 and C2, wherein the first end of the resistor R4 is connected with the 7 th pin of the U3.2 of the feedback chip, the first end of the resistor R7 is connected with a direct-current DC voltage-controlled signal, the second end of the resistor R4 is simultaneously connected with the 2 nd pin of the operational amplifier chips U2.1 and the first end of the capacitor C1, the second end of the resistor R7 is simultaneously connected with the first end of the capacitor C2 and the 3 rd pin of the operational amplifier chips U2.1, the second end of the capacitor C2 is simultaneously connected with the anode of the diode D2, the first end of the resistor R5 is connected with the voltage-controlled amplification module, the 1 st pin of the operational amplifier chips U2.1 is connected with the first end of the resistor R8, the second end of the resistor R8 is simultaneously connected with the anode of the diode D2 and the cathode of the diode D4, and the anode of the diode D4 is connected with the anode of the diode D4.
As shown in fig. 4: the voltage-controlled amplifying module comprises a voltage-controlled chip U1, resistors R10, R11, R12, R13, R14, R15 and an amplifying chip U4.1, wherein pins 3 and 6 of the voltage-controlled chip U1 are connected with an Alternating Current (AC) waveform reference signal, pin 2 of the voltage-controlled chip U1 is connected with a first end of a resistor R5, pins 4 and 5 of the voltage-controlled chip U1 are connected with two ends of a resistor R10, pins 1 and 14 of the voltage-controlled chip U1 are connected with a positive electrode of a power supply, pins 7 and 8 of the voltage-controlled chip U1 are connected with a negative electrode of the power supply, pin 12 of the voltage-controlled chip U1 is connected with a first end of a resistor R11, pin 10 of the voltage-controlled chip U1 is simultaneously connected with a second end of a resistor R11 and a first end of a resistor R13, pin 11 of the voltage-controlled chip U1 is simultaneously connected with a second end of a resistor R12, a first end of a resistor R14 and a negative electrode of the power supply, a second end of a resistor R13 is connected with a second end of the voltage-controlled chip U1, and a first end of a resistor R14 is simultaneously connected with a first end of a resistor R1 and a first end of a resistor R15, and a first end of a circuit of the amplifier U1 is simultaneously connected with a second end of the resistor R1 and a first end of the resistor 1.
The voltage-controlled amplifying module is a component for controlling the gain of the operational amplifier through DC voltage, and the gain of the operational amplifier input to the output can be controlled through changing the voltage. In the utility model, the voltage-controlled amplifying module selects a VCA821 as a chip for controlling the output size and stability of the high-voltage alternating voltage, and can be replaced by a four-quadrant multiplier in practical use.
The technical scheme of the utility model is not limited to the specific embodiment, and all technical modifications made according to the technical scheme of the utility model fall within the protection scope of the utility model.
Claims (4)
1. A voltage controlled AC circuit with feedback, characterized by: the power supply output end of the power supply module is respectively connected with the power supply input ends of the operational amplifier control loop, the operational amplifier feedback loop, the voltage-controlled amplifier module and the amplifying circuit, the signal input end of the operational amplifier control loop is connected with a direct-current (DC) voltage-controlled signal, the DC feedback signal output end of the operational amplifier control loop is connected with the feedback signal input end of the voltage-controlled amplifier module, the signal input end of the voltage-controlled amplifier module is connected with an alternating-current (AC) waveform reference signal, the control signal output end of the voltage-controlled amplifier module is connected with the amplifying circuit, the signal output end of the amplifying circuit is connected with a signal output interface, and the AC feedback signal output end of the signal output interface is connected with the feedback signal input end of the operational amplifier control loop through the operational amplifier feedback loop.
2. The voltage controlled AC circuit with feedback of claim 1 wherein: the operational amplifier feedback loop comprises resistors R1, R2, R3, R6, R9, diodes D1 and D3, and feedback chips U3.1 and U3.2, wherein one end of the resistor R6 is connected with an AC feedback signal output end of a signal output interface, the other end of the resistor R6 is simultaneously connected with a second pin of the feedback chip U3.1, a first end of the resistor R1 and a first end of the resistor R9, the first pin of the feedback chip U3.1 is simultaneously connected with a negative electrode of the diode D1 and a positive electrode of the diode D3, the second end of the resistor R1 is simultaneously connected with a first end of the resistor R2 and a positive electrode of the diode D1, the second end of the resistor R9 is simultaneously connected with a negative electrode of the diode D3 and a 5 th pin of the feedback chip U3.2, a 6 th pin of the feedback chip U3.2 is simultaneously connected with a second end of the resistor R2 and a first end of the resistor R3, and the second end of the resistor R3 is simultaneously connected with a first end of the feedback chip U3.2, and the second end of the resistor R3 is simultaneously connected with a first end of the feedback chip U3.7.
3. The voltage controlled AC circuit with feedback of claim 2 wherein: the operational amplifier control loop comprises resistors R4, R5, R7, R8, diodes D2 and D4, operational amplifier chips U2.1 and capacitors C1 and C2, wherein the first end of the resistor R4 is connected with the 7 th pin of the U3.2 of the feedback chip, the first end of the resistor R7 is connected with a direct-current DC voltage-controlled signal, the second end of the resistor R4 is simultaneously connected with the 2 nd pin of the operational amplifier chips U2.1 and the first end of the capacitor C1, the second end of the resistor R7 is simultaneously connected with the first end of the capacitor C2 and the 3 rd pin of the operational amplifier chips U2.1, the second end of the capacitor C2 is simultaneously connected with the anode of the diode D2, the first end of the resistor R5 is connected with the voltage-controlled amplification module, the 1 st pin of the operational amplifier chips U2.1 is connected with the first end of the resistor R8, the second end of the resistor R8 is simultaneously connected with the anode of the diode D2 and the cathode of the diode D4, and the anode of the diode D4 is connected with the anode of the diode D4.
4. The voltage controlled AC circuit with feedback of claim 3 wherein: the voltage-controlled amplifying module comprises a voltage-controlled chip U1, resistors R10, R11, R12, R13, R14, R15 and an amplifying chip U4.1, wherein pins 3 and 6 of the voltage-controlled chip U1 are connected with an Alternating Current (AC) waveform reference signal, pin 2 of the voltage-controlled chip U1 is connected with a first end of a resistor R5, pins 4 and 5 of the voltage-controlled chip U1 are connected with two ends of a resistor R10, pins 1 and 14 of the voltage-controlled chip U1 are connected with a positive electrode of a power supply, pins 7 and 8 of the voltage-controlled chip U1 are connected with a negative electrode of the power supply, pin 12 of the voltage-controlled chip U1 is connected with a first end of a resistor R11, pin 10 of the voltage-controlled chip U1 is simultaneously connected with a second end of a resistor R11 and a first end of a resistor R13, pin 11 of the voltage-controlled chip U1 is simultaneously connected with a second end of a resistor R12, a first end of a resistor R14 and a negative electrode of the power supply, a second end of a resistor R13 is connected with a second end of the voltage-controlled chip U1, and a first end of a resistor R14 is simultaneously connected with a first end of a resistor R1 and a first end of a resistor R15, and a first end of a circuit of the amplifier U1 is simultaneously connected with a second end of the resistor R1 and a first end of the resistor 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321029353.5U CN219627678U (en) | 2023-05-04 | 2023-05-04 | Voltage-controlled AC circuit with feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321029353.5U CN219627678U (en) | 2023-05-04 | 2023-05-04 | Voltage-controlled AC circuit with feedback |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219627678U true CN219627678U (en) | 2023-09-01 |
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ID=87775037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321029353.5U Active CN219627678U (en) | 2023-05-04 | 2023-05-04 | Voltage-controlled AC circuit with feedback |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219627678U (en) |
-
2023
- 2023-05-04 CN CN202321029353.5U patent/CN219627678U/en active Active
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