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本刊今年第5期介绍了一种提高光电编码器分辩率的位置细分电路,其分辩率最大为光电编码器分辩率的4倍。为满足更高精度的测量,本文介绍一种由CMOS锁相环和方向鉴别器组成的位置细分电路。其原理框图如图1所示。图中f_A、f_B分别表示A相和B相脉冲,A相脉冲为计数脉冲,B相脉冲为辨向脉冲。设A相脉冲在前作加法计数,否则,作减法计数。图1虚线框I部分,是由一块CMOS锁相环电路CD4046和一块双BCD加法计数器CD4518组成的最大为100倍的倍频电路,其电路图如图2所示。图中双BCD加法计数器CD4518组成20分频器。工
This issue No. 5 of this year introduces a position resolution circuit to improve the resolution of the photoelectric encoder, the resolution of up to 4 times the resolution of the photoelectric encoder. In order to meet the need of more accurate measurement, this paper introduces a position subdivision circuit composed of CMOS phase-locked loop and direction discriminator. The block diagram shown in Figure 1. The figure f_A, f_B, respectively, A phase and B phase pulse, A phase pulse count pulse, B phase pulse for the directional pulse. Let A-phase pulse add count before, otherwise, subtract count. I part of the dashed box in Figure 1, is a CMOS phase-locked loop circuit CD4046 and a double BCD summing counter CD4518 composed of up to 100 times the frequency multiplier circuit, the circuit shown in Figure 2. The figure double BCD summing counter CD4518 composed of 20 divider. work