基于FPGA的雙通道旋轉(zhuǎn)變壓器測(cè)角系統(tǒng)

摘 要:提出了一種基于FPGA的雙通道旋轉(zhuǎn)變壓器測(cè)角電路設(shè)計(jì)方案，通過FPGA來控制AD2S82A、AD2S80A的解碼和同步問題。同時(shí)用FPGA對(duì)轉(zhuǎn)換后數(shù)據(jù)進(jìn)行誤差補(bǔ)償和組合，以及二進(jìn)制角度值的轉(zhuǎn)換，提高了整個(gè)系統(tǒng)的集成度和可靠度。整個(gè)電路在Altium Designer 9.0設(shè)計(jì)環(huán)境下設(shè)計(jì)實(shí)現(xiàn)。采用Altera公司的EP2C35F484C6型FPGA芯片進(jìn)行FPGA部分的仿真，實(shí)驗(yàn)和仿真的結(jié)果很好地實(shí)現(xiàn)了該方案的設(shè)計(jì)功能，并滿足高精度、高速度轉(zhuǎn)換的設(shè)計(jì)要求。

關(guān)鍵詞:雙通道旋轉(zhuǎn)變壓器; FPGA; AD2S80A; AD2S82A; 測(cè)角

中圖分類號(hào):TN710; TP29文獻(xiàn)標(biāo)識(shí)碼:A

文章編號(hào):1004-373X(2010)15-0141-03

Angle Measurement System for Two-speed Resolver Based on FPGA

JIANG Bo1，2， LIANG Yan-bing1， WANG Chen1，2

(1. Xi’an Institute of Optics and Precision Mechanics， Chinese Academy of Sciences， Xi’an 710119， China;

2. Graduate School， Chinese Academy of Sciences， Beijing 100039， China)

Abstract: A design scheme of angle measurement circuit for two-speed resolver based on FPGA is introduced， which controls the decoding and synchronization of AD2S82A and AD2S80A through FPGA. The error compensation and combination of the converted data and the conversion of binary angle value were carried on by FPGA， in order to improve the integration and reliability of the whole system. The whole circuit was designed in Altium Designer 9.0 design environment. The simulation of FPGA part is based on the chip EP2C35F484C6 of Altera Company， the test and simulation results achieve the design functions of the scheme commendably， and meet the requirement about high-precision， high-speed conversion of the design.

Keywords: two-speed resolver; FPGA; AD2S80A; AD2S82A; angle measurement

0 引 言

旋轉(zhuǎn)變壓器是一種電磁感應(yīng)式傳感器，用來測(cè)量旋轉(zhuǎn)物體的轉(zhuǎn)軸角位移和角速度，它由定子和轉(zhuǎn)子組成。其中定子繞組作為變壓器的原邊，接受勵(lì)磁電壓，轉(zhuǎn)子繞組作為變壓器的副邊，通過電磁耦合得到感應(yīng)電壓。為了提高測(cè)量精度，采用雙通道旋轉(zhuǎn)變壓器。雙通道旋轉(zhuǎn)變壓器采用單相定子激磁、兩相定子感應(yīng)輸出。在激磁繞組加上激磁電壓Uref后，在粗軸的定子繞組中感應(yīng)出正余弦電壓Uc_sin，Uc_cos，在精軸的定子繞組中也感應(yīng)出正余弦電壓Uf_sin，Uf_cos[1]。

AD2S82A和AD2S80A是美國(guó)模擬器件公司(Analog Devices Inc)生產(chǎn)的分解器數(shù)字轉(zhuǎn)換器(簡(jiǎn)稱RDC)。AD2S8X系列RDC可將轉(zhuǎn)角轉(zhuǎn)換成與轉(zhuǎn)角成比例的數(shù)字量，它實(shí)質(zhì)上是一種特殊的模數(shù)轉(zhuǎn)換器。AD2S82A和AD2S80A都屬于AD2S8X系列中的產(chǎn)品，是一種單片式、分辨率可變RDC。在制造過程中它采用BiMOS工藝，使用雙極性高精度線性電路，因此具有精度高、性能穩(wěn)定及可靠性高等特點(diǎn)[2-3]。

FPGA是可編程邏輯器件(PLD)的第四代產(chǎn)品，內(nèi)部具有獨(dú)立的I/O接口和邏輯單元CLB。……