Digital signal isolator

Abstract

The invention provides a digital signal isolator comprising a sending terminal and a receiving terminal. The sending terminal comprises a filtering circuit, a refresh circuit, a delay circuit, a refresh and pulse combination circuit, a differential signal conversion circuit, a first isolation gate capacitor and a second isolation gate capacitor; the receiving terminal comprises a third isolation gate capacitor, a fourth isolation gate capacitor, a hysteresis comparator, a watchdog circuit, a filtering circuit and an or gate. The digital signal isolator disclosed in the invention is capable ofkeeping an electric level unchanged for a long time even when low speed signals are transmitted, the digital signal isolator can be prevented from interference from a common mode electric level, and problems of false triggering can be effectively prevented.

Description

technical field [0001] The invention relates to the technical field of digital signal transmission, in particular to a digital signal isolator based on double isolation barrier capacitance. Background technique [0002] Isolation is a hot topic today, and it is of great significance to study isolation and isolated devices. There are multiple sets of ground wires in many current systems, and the ground wire loop will have a large current passing through it, so it will bring a lot of noise, and it will affect the system performance and may burn the system components. In order to prevent the occurrence of the above-mentioned problems, an isolation method is generally adopted in the prior art to solve them. Secondly, the manual operation control interface sometimes wants to be isolated from the system execution end. On the one hand, there may be a high-voltage dangerous environment at the system execution end, and on the other hand, it is also to reduce circuit instability caus...

AI Technical Summary

Problems solved by technology

However, because it uses high-frequency pulses to send low-frequency data when transmitting data, it has large power consumption and high cost, and there are certain limitations.

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