Two-phase zero-crossing signal detection circuit and optical fiber signal transmission system

Abstract

The invention discloses a double-phase zero-crossing signal detection circuit required by a bidirectional spark ignition circuit, and an optical fiber signal transmission system. The detection circuitcomprises an input RC filter circuit, a positive and negative half-cycle zero-crossing signal detection and pulse driving circuit, and a positive and negative half-cycle zero-crossing detection pulsefiber transmitter and receiver. One end of the positive and negative half-cycle zero-crossing signal detection and pulse driving circuit is connected with a power frequency alternating current through the input RC filter circuit, and the other end is connected with the positive and negative half-cycle zero-crossing detection pulse fiber transmitter. The positive and negative half-cycle zero-crossing detection pulse fiber transmitter transmits a zero-crossing detection pulse to the positive and negative half-cycle zero-crossing detection pulse fiber receiver, and finally transmits the zero-crossing detection pulse to a single-chip microcomputer. The circuit can simultaneously meet the requirements of the AC zero-crossing signal detection, the AC electrode polarity detection and the high-speed fiber pulse signal transmission, is simple in circuit principle, and is easy to manufacture and debug.

Description

technical field [0001] The invention relates to the technical field of AC spark spectrum analysis, in particular to a dual-phase zero-crossing signal detection circuit and an optical fiber signal transmission system. Background technique [0002] A high repetition rate spark light source requires a bidirectional excitation circuit, which needs to detect the zero crossing of the alternating current and the polarity of the alternating current. The traditional method either has a large power consumption, or needs to occupy a large volume, which increases the complexity of the system. [0003] In order to solve the electromagnetic compatibility problem of the above circuit, it is necessary to separate the pulse generation circuit from the pulse excitation circuit. The reliable method of transmitting pulse signals to the high voltage excitation circuit is optical fiber transmission, and the high-speed optical fiber transmission system requires a large drive current, which further...

AI Technical Summary

Problems solved by technology

The traditional method either has a large power consumption, or needs to occupy a large volume, increasing the complexity of the system

[0003] In order to solve the electromagnetic compatibility problem of the above circuit, it is necessary to separate the pulse generation circuit from the pulse excitation circuit. The reliable method of transmitting pulse signals to the high voltage excitation circuit is optical fiber transmission, and the high-speed optical fiber transmission system requires a large drive current, which further increases The difficulty of designing such circuits

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