Rotating transformer exciting circuit based on sinusoidal pulse width modulation (SPWM)

Abstract

The invention discloses a rotating transformer exciting circuit based on sinusoidal pulse width modulation (SPWM), which comprises a microprocessor, an analog demodulation circuit and a power amplification circuit, wherein the microprocessor adopts DSP to perform digital modulation so as to load a required sinusoidal fundamental wave signal to a high-frequency square wave carrier signal to form an SPWM wave signal, and output SPWM waves to the analog demodulation circuit in a differential mode. The analog demodulation circuit adopts a two-circuit duplicate-supply operational amplifier TL082, and one path of the operational amplifier forms a differential proportion calculator, while the other path forms a filter. The power amplification circuit adopts a two-circuit duplicate-supply linear power amplifier PA60 and a resistor to form a two-circuit reversed phase proportioner, and blocks the input sinusoidal fundamental wave signal and amplifies the power to generate an exciting signal and simultaneously drive a two-circuit rotating transformer to work. The rotating transformer exciting circuit has the advantages of simple circuit, safety and reliability, small temperature drift and direct current component, good stability of output signals, and low degree of distortion of output waveforms.

Description

technical field [0001] The invention relates to the technical field of transformer magnetic variable generation, in particular to an excitation circuit for generating an excitation signal of a resolver by using a sinusoidal pulse width modulation (SPWM) technique, which can be used to drive various types of resolver. Background technique [0002] As a precision angle measuring element, the resolver is widely used in military industry, shipbuilding, aerospace, smelting, mining and other industries due to its excellent anti-vibration, impact resistance and adaptability in various harsh environments. [0003] The resolver is a passive component, and it must be driven by a specific sinusoidal signal at its excitation end when in use. For an angle measuring system with a resolver as a sensor, the excitation signal is like its heart. It is the engine for the normal operation of the whole system, and the quality of the signal index will directly affect the angle measurement perfor...

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Problems solved by technology

[0007] The purpose of the present invention is to develop a stable and reliable SPWM based on sinusoidal pulse width modulation for the main defects such as the poor stability of the excitation signal of the above-mentioned rotary transformer, the large degree of waveform distortion, the large influence of the ambient temperature, and the low signal frequency. The rotary transformer excitation circuit, the structure of the circuit should be simple and effective, the output waveform should have high frequency, small temperature drift, low waveform distortion, and good waveform stability

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