编码器换向误码输出原因探讨及鉴相电路改进

Discussion about reasons for export errors with encoder alternating direction and phase discriminator amelioration

从编码器的结构特点出发,探讨了编码器频繁换向时输出信号中存在误码脉冲的原因。根据编码器输出信号不能同时跳变的特点,设计了一种更简单有效的双向触发鉴相电路。该电路通过标记两相输出信号跳变时刻的状态,经过一定的逻辑与运算,有效地滤除了输出信号中存在的误码脉冲。经实验室应用证明,该电路具有较好的误码滤除效果,为编码器内部电路的改进及其输出信号的数字处理提供了一种新思路。

Based on the structure of a photoelectric encoder, the reason for errors appearing in export pulses was discussed when the encoder frequently alternates direction. A simpler and more useful phase discriminator was designed because the export pulses can not change at the same time. This circuit marks the state of export pulses when one instantaneously changes, to effectively filter the errors in export pulses by some logical calculation, The laboratory application of the filtercircuit testifies that this circuit has preferable effect on filtering errors. And a new method is offered in order to improve the inside circuit of encoder and deal with the pulses of encoder export in digital signal processing（DSP） chip.