Digital converter conversion program of synchro / rotary transformer

Abstract

The invention discloses a digital converter conversion program of a synchro / rotary transformer. A voltage signal outputted by a synchro / rotary transformer digital converter is isolated and amplified through an isolation amplifier, and is simultaneously sampled by an A / D converters; after the A / D converter completes analog to digital conversion, the microcontroller reads three digital signals outputted by the A / D converter; and through multiplication and division, a look-up table, summation and other operations, a digital angle is outputted. The program of the invention uses software to realize various functions, and has the advantages of simple circuit, high precision, low power consumption, high reliability and low cost.

Description

technical field [0001] The invention relates to a scheme for digitally processing the shaft angle signal of the synchro / revolving transformer and converting the signal of the synchro / revolving transformer into a digital signal required by a computer. Background technique [0002] The synchro is used as a displacement sensor to measure the angle in the servo system. It can also be used to realize the long-distance transmission, transformation, reception and indication of the angle signal. It is widely used in the tracking control of navigation, aviation and aerospace systems. It can also be used in In equipment such as CNC machine tools and robots. [0003] The resolver is a precision angle, position, and speed detection device, which is suitable for all occasions where the rotary encoder is used, especially the occasions where the rotary encoder cannot work normally such as high temperature, severe cold, humidity, high speed, and high vibration. It is widely used in Angle a...

AI Technical Summary

Problems solved by technology

[0007] Some use high-voltage integrated circuits based on high-voltage BiMOS technology. For example, in the Chinese patent application number 201010126443.7 titled "Single-chip auto-alignment machine / resolver-digital conversion scheme", the adjustable solid-state control transformer circuit, AC Composed of error amplification circuit, high-pass filter circuit, phase-sensitive demodulation circuit, second-order integral circuit, voltage-controlled oscillation circuit, counting circuit and level conversion circuit, there are the following problems: the circuit structure is too complicated; using multi-stage amplifiers in series, each The first-stage amplifiers have zero drift and temperature drift. After being connected in series, the drift is gradually amplified; using a second-order RC high-pass filter, the capacitor will cause a phase shift, and the auto-synchronizer / resolver outputs multiple signals at the same time. When the signals are processed at the same time, it is difficult to achieve the same capacitance parameters of each channel, and the capacitance is not adjusted, the capacitance error is large, which increases the measurement error of the angle; there is no isolation amplifier in the circuit, and the circuit is affected by the long-distance transmission. Interference, may generate instantaneous high voltage, easy to damage the circuit

[0008] Some use low-voltage integrated circuits based on CMOS technology, such as the application number 200810013440.3, in the Chinese patent titled "High-precision CMOS Integrated Angle Adjuster / Resolver-Digital Conversion Technology", the voltage is only ±5V, and the input signal The range is small, the conversion accuracy is low, because it contains multiple parts, the electrical connection structure is complicated, the stability is poor, and the output data function is single. The solid-state control transformer circuit adopts switched capacitor technology, which has switching noise.

[0009] Some adopt a split structure, which often has defects such as large volume, low integration, and poor reliability. It cannot be applied in occasions requiring high precision such as real-time tracking systems, which is not conducive to the promotion and use in the field of angle measurement and control.

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