Delta-Sigma modulation principle based digital switching device and method for rotary transformer

A resolver and digital conversion technology, applied in the direction of analog-to-digital converters, can solve the problem of high cost, achieve the effect of reducing system cost, improving angle accuracy and system stability

Inactive Publication Date: 2012-10-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem of high cost of using a dedicated chip for digital conversion of the analog signal output by the resolver, and provides a resolver digital conversion device and method based on the ΔΣ modulation principle

Method used

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  • Delta-Sigma modulation principle based digital switching device and method for rotary transformer
  • Delta-Sigma modulation principle based digital switching device and method for rotary transformer
  • Delta-Sigma modulation principle based digital switching device and method for rotary transformer

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specific Embodiment approach 1

[0031] Specific implementation mode one: the following combination Figure 1 to Figure 9 Describe this embodiment, this embodiment is a further description of Embodiment 1, the rotary transformer digital conversion device based on the ΔΣ modulation principle described in this embodiment, it includes a rotary transformer 1, it also includes a low-pass filter 2, a carrier generation 3, ΔΣ modulator 4, sine channel unit 5, cosine channel unit 6 and closed-loop angle tracker 7,

[0032] The sinusoidal carrier signal output end of the carrier generator 3 is connected to the sinusoidal carrier signal input end of the low-pass filter 2, and the low-pass filter signal output end of the low-pass filter 2 is connected to the excitation signal input end of the resolver 1,

[0033] The sine analog signal output end of the resolver 1 is connected to the sine analog signal input end of the ΔΣ modulator 4, the cosine analog signal output end of the resolver 1 is connected to the cosine analo...

specific Embodiment approach 2

[0036] Specific implementation mode two: the following combination figure 2 , Figure 7 and Figure 8 This embodiment is described. This embodiment is a further improvement on Embodiment 1. The composition of the sine channel unit 5 and the cosine channel unit 6 in this embodiment is the same. The following uses the sine channel unit 5 as an example for illustration. The sine channel unit 5 The composition is as follows:

[0037] The sinusoidal channel unit 5 is made up of correction delay counter 5-1, sampling filter 5-2, multiplier 5-3 and integrator 5-4,

[0038] The carrier signal input end of the correction delay counter 5-1 is the carrier signal input end of the sinusoidal channel unit 5, and the sinusoidal digital signal input end of the sinusoidal channel unit 5 is the sinusoidal digital signal input end of the sampling filter 5-2. The clock signal input end of channel unit 5 is the clock signal input end of sampling filter 5-2,

[0039] The filter signal output e...

specific Embodiment approach 3

[0042] Specific implementation mode three: the following combination Figure 1 to Figure 9 Describe this embodiment, the resolver digital conversion method based on the ΔΣ modulation principle based on the device described in Embodiment 1 in this embodiment,

[0043] The carrier wave generator 3 generates a sinusoidal excitation carrier signal in the form of PWM, which is filtered by the low-pass filter 2 and then applied to the primary excitation winding of the resolver 1. The two-phase quadrature secondary induction windings of the resolver 1 output amplitudes with Sine and cosine regularly changing analog signals, the two analog signals are input to the ΔΣ modulator 4 after voltage bias, and the ΔΣ modulator 4 outputs two 1-bit digital streams, and the two digital streams are respectively input to the sine channel unit 5 and the cosine channel unit 6, the sine channel unit 5 and the cosine channel unit 6 sample and filter the input one-bit digital stream and eliminate the c...

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Abstract

The invention provides a Delta-Sigma modulation principle based digital switching device and method for a rotary transformer, which belongs to the technical field of digital switching of a rotary transformer output signal, and solves the current problems of digitally converting an analog signal outputted by the rotary transformer by means of calculation with a specialized chip and the high cost. The device comprises a rotary transformer, and also includes a low pass filter, a carrier wave generator, a Delta-Sigma modulator, a sine channel unit, a cosine channel unit and a closed loop angle tracker. The method includes the steps of converting the analog signal returned by the rotary transformer to a digital signal based on the Delta-Sigma A/D converter with an oversampling principle, wherein the digital signal has a delay correcting function, multiplying the digital signal being sampled and filtered with a delay marking signal to compensate the whole system, calculating the inputted signal by the closed loop angle tracker, and obtaining an angle signal and an angular speed signal of the motor measured by the rotary transformer. The device and the method provided by the invention are suitable for the digital conversion of the signals outputted by the rotary transformer.

Description

technical field [0001] The invention relates to a rotary transformer digital conversion device and method based on the ΔΣ modulation principle, belonging to the technical field of digital conversion of rotary transformer output signals. Background technique [0002] Due to its outstanding advantages such as high temperature resistance, humidity resistance, reliable structure, and strong anti-interference ability, the resolver is suitable for occasions with harsh environments and has been more and more widely used in motor control systems. However, the output of the resolver is two analog signals whose amplitude varies with the position, which needs to be converted into digital signals by a dedicated digital converter (RDC) before they can be used by the digital controller. [0003] At present, there are mainly two methods for digital conversion of the output analog signal of the resolver: the first is to use a dedicated digital conversion chip on the market, such as the AD2S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
Inventor 杨贵杰周长攀苏健勇刘剑邢念伟
Owner HARBIN INST OF TECH
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