Cross-board isolation circuit

Abstract

The present invention provides a cross-board isolation circuit. The cross-board isolation circuit includes: a first circuit, a second circuit, and a third circuit that are mutually independent in terms of hardware. The first circuit is provided with a first isolation unit. A second isolation unit is provided on the third circuit, and the first isolation unit is connected to the second isolation unit through the second circuit. The cross-board isolation circuit of the present invention improves the anti-interference ability of long-distance cross-board analog signal transmission, has the function of signal isolation between boards, and improves the reliability and stability of the system. The adoption of the LVDS interface in the present invention has a significant effect on improving the stability of digital signal transmission between boards and the anti-interference ability.

Description

technical field [0001] The invention belongs to the field of electronics, in particular to a cross-board isolation circuit. Background technique [0002] Existing power amplifiers can use several types of class A, class B, class AB and class D. Among them, when the class D digital power amplifier is working, the output stage MOS tube is in the state of being completely turned on or completely turned off, and its switching frequency is usually between 200KHz~1MHz, which is much higher than the frequency of the input signal, which reduces the linear amplification work of the MOS tube. The problem of low conversion efficiency of the power amplifier occurs due to the time zone. Compared with mature audio power amplifiers such as Class A, Class B, and Class AB, Class D power amplifiers have the characteristics of higher conversion efficiency, greater output power, and lower distortion rate. Class D digital power amplifiers The amplifier is mainly composed of modules such as pul...

AI Technical Summary

Problems solved by technology

[0003] The existing digital power amplification system in the field of industrial control is usually divided into two circuit boards to produce the signal generation circuit and the power amplification circuit (or power amplifier) ​​that generate the analog input signal due to the limitations of the system architecture. The two boards are then transmitted through the signal. The interface circuit board performs signal transmission, and the analog input signal of the digital power amplification system is easily distorted by external electromagnetic interference during long-distance transmission between the signal generation circuit and the power amplifier.

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