A Solution to Self-excited Oscillation of AC Signal Processing Circuit

A technology for processing circuits and AC signals, applied in testing circuits, testing dielectric strength, etc., can solve problems such as the quality impact of DC analog quantities, and achieve the effects of completeness and safety guarantees, low manufacturability requirements, and easy implementation

Active Publication Date: 2020-06-09
XIAN FLIGHT SELF CONTROL INST OF AVIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the present invention: to propose an analog input function board under the specific condition that the diode in the voltage limiting circuit conducts, and the self-excited oscillation of the follower in the level conversion circuit has an impact on the quality of the DC analog output of the AC demodulation circuit the solution

Method used

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  • A Solution to Self-excited Oscillation of AC Signal Processing Circuit
  • A Solution to Self-excited Oscillation of AC Signal Processing Circuit
  • A Solution to Self-excited Oscillation of AC Signal Processing Circuit

Examples

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Embodiment 1

[0028] An AC signal processing circuit is composed of three parts: an AC demodulation circuit, a level conversion circuit and a voltage limiting circuit. The AC demodulation circuit inputs the AC high-end signal with an effective value of 7V and a frequency of 2400KHz, and the AC low-end signal with an effective value of 1V and a frequency of 2400KHz. The circuit needs to perform impedance matching, demodulation, gain conversion and filtering on AC high-end signals, AC low-end signals, and AC mid-pumped signals. Processing requirements: gain 2.0, filtering meets After AC demodulation, output a DC analog quantity, the value is (7-1) × 2 = 12V; the power supply of the AC demodulation circuit is 15V, and the level converter used for the level conversion circuit is the REF01 type level converter, REF01 The model level converter converts the power supply of the AC demodulation circuit from 15V to 10V, and outputs it through the follower. The operational amplifier in the follower i...

Embodiment 2

[0030] An AC signal processing circuit is composed of three parts: an AC demodulation circuit, a level conversion circuit and a voltage limiting circuit. AC demodulation circuit input AC high-end signal RMS 6V, frequency 1800KHz, AC low-end signal RMS 2V, frequency 1800KHz. The circuit needs to perform impedance matching, demodulation, gain conversion and filtering on AC high-end signals, AC low-end signals, and AC mid-pumped signals. Processing requirements: gain 3.0, filtering meets After AC demodulation, output a DC analog quantity, the value is (6-2) × 3 = 12V; the power supply of the AC demodulation circuit is 15V, and the level converter used for the level conversion circuit is REF01 signal level converter, REF01 The signal level converter converts the 15V power supply of the AC demodulation circuit to 10V, and outputs it through the follower. The operational amplifier in the follower is OP400, and the resistance one (3) and the second resistance (4) are RJK52- 0.05W-2...

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Abstract

The invention discloses a solution for the self-oscillation of an alternate current signal processing circuit, provides a solution for the occurrence of self-excitation to a follower composed of an operational amplifier, and belongs to the application field of an analog circuit. In the invention, the constitution form of a follower circuit to which self-excitation occurs in an alternate current signal processing circuit is optimized, the optimization and change scheme takes the minimum change of an analog input function board as the reference, the optimized and changed circuit feedback coefficient |F| changes, so that the self-oscillation formula |AF|> / =1 of the operational amplifier does not hold, and thus the self-oscillation of the operational amplifier in the follower is destructed. According to the optimized circuit of the invention, the ripple generated by the self-oscillation is not superimposed on the alternate current demodulation circuit output direct current analog, and the consistency, stability and reliability of the output signal of the analog input function board are improved.

Description

technical field [0001] The invention relates to a solution to the self-excited oscillation of an AC signal processing circuit, in particular to a solution to the self-excited oscillation of a follower composed of an operational amplifier, and belongs to the application field of analog circuits. Background technique [0002] The analog input function board is widely used in the flight control system to process and collect sensor instructions. In the analog input function board, the AC analog signal in the sensor instruction is processed by the AC demodulation circuit. The input of the AC demodulation circuit is Three AC analog quantities from sensors, in the AC demodulation circuit, these three AC analog quantities are output as one DC analog quantity after impedance matching, demodulation, gain conversion and filtering. The DC analog quantity is output to the AD acquisition through the voltage limiting circuit and uploaded to the bus, and finally represented as the rudder at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/14
CPCG01R31/14
Inventor 陈虹张朝阳李小民彭宏业李军史杰韩骥宇
Owner XIAN FLIGHT SELF CONTROL INST OF AVIC
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