Signal-digit converter of low-temperature drift rotary transformer

A resolver and digital converter technology, which is applied in the direction of using electric/magnetic devices to transmit sensing components, can solve problems such as difficult mass production, high cost, and large volume, and achieve high precision, high speed, low power consumption, The effect of good robust performance

Active Publication Date: 2010-07-28
连云港杰瑞电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few types of axis-angle-to-digital converters independently developed in China. For a lon

Method used

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  • Signal-digit converter of low-temperature drift rotary transformer
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  • Signal-digit converter of low-temperature drift rotary transformer

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1. refer to Figure 1-2 . A low-temperature drift resolver signal-to-digital converter, which consists of a sine-cosine multiplier, an error amplifier, a phase-sensitive demodulator and a phase detector, a voltage-controlled oscillator, a 12-bit reversible counter, a latch, and an incremental codec and serial interface;

[0030] It adopts linear compatible CMOS process;

[0031] It uses a temperature-compensated bootstrap mirror current reference source to achieve a reference current output that has nothing to do with the power supply voltage and has a temperature drift close to zero near 300K;

[0032]The input resolver analog signal θ is compared with the digital signal φ of the 12-bit reversible counter through the sine-cosine multiplier, and converted into the error voltage signal Verror; the error voltage signal Verror is amplified by the error amplifier and then input to the phase-sensitive demodulator and phase detector , the external reference voltag...

Embodiment 2

[0033] Example 2. refer to Figure 1-5 . In the low-temperature drift resolver signal-to-digital converter described in Embodiment 1, the sine-cosine multiplier is composed of a high five-bit coarse-precision segment selection circuit, a low seven-bit high-precision linear segment circuit, a switch control and a decoder composition;

[0034] The high five-bit coarse-precision segment selection circuit adopts a switch-linear combination circuit to decompose the angle change from 0°-360° to 0°-11.25°; the low seven-bit high-precision linear segment circuit adopts R-2R type D / A converter;

[0035] The resolver analog signal θ outputs two-way comparison signals Vo1 and Vo2 through the high five-bit coarse-precision segment selection circuit, and then generates an error voltage signal Verror through the low seven-bit high-precision linear segment circuit and outputs it to the error amplifier; switch control and decoder The input digital signal φ is converted into a switch signa...

Embodiment 3

[0036] Example 3. refer to Figure 1-5 . In the low-temperature drift resolver signal-to-digital converter described in embodiment 1 or 2, the phase-sensitive demodulator and phase detector are made up of phase-sensitive demodulator, phase detector and feedback circuit; The demodulator is composed of a Schmitt trigger and an integrating circuit to realize the dynamic delay sampling of the external reference voltage signal REF and the error voltage signal Verror at different frequencies; the phase detector is composed of a CMOS switch and a high-precision BiCMOS operational amplifier .

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Abstract

The invention discloses a signal-digit converter of a low-temperature drift rotary transformer. The signal-digit converter is characterized by consisting of a sine and cosine multiplier, an error amplifier, a phase-sensitivity demodulating and phase discriminating device, a voltage-controlled oscillator, a 12-bit reversible counter, a latch, an incremental codec and a serial interface. In the invention, a linear compatible CMOS (Complementary Metal-Oxide-Semiconductor Transistor) process is used; and by adopting a temperature self-compensated bootstrap mirror image current reference source, the invention realizes the output of reference current which is irrelative with mains voltage and near-zero temperature drift near 300K. The sampling precision can be improved by adopting a CMOS switch capacitance technology. All peripheral assemblies are integrated inside an integrated circuit and the most tidy pin definition is formed, so that track conversion from the angle to digital quantity can be realized without extra assemblies. The low-temperature drift can be realized by adopting a zero temperature drift reference source. The wide work frequencies of an input signal and a reference signal can be realized by adopting a dynamic time-delay technology. The high track speed can be realized by adopting a technology of high performance operational amplifier, switch and linear combination and high-speed dynamic parameter design.

Description

technical field [0001] The invention belongs to the field of special integrated circuit design, and in particular provides a low-temperature drift resolver signal-to-digital converter. Background technique [0002] Resolver signal-to-digital converter is the core device in modern shaft-angle electronic conversion technology, which can convert shaft-angle analog signals into digital angle signals in real time, and is widely used in aerospace, aviation, radar, fire control and industrial automation fields. At present, there are few types of axis-angle-to-digital converters independently developed in China, and they have been assembled with discrete components for a long time. The cost is high, the volume is large, and it is difficult to mass-produce. The development of various technologies of integrated circuits requires the development of integrated circuits with low power consumption, high performance and large quantities. Existing shaft-angle integrated circuits tend to be...

Claims

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Application Information

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IPC IPC(8): G01D5/244
Inventor 陈大科罗佳亮韩彬
Owner 连云港杰瑞电子有限公司
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