Isolated communication circuit

Abstract

The present application relates to an isolated communication circuit, comprising a circuit board and an isolated communication device disposed on the circuit board; the isolated communication device comprises a primary port, an isolation chip, and a secondary port that are sequentially connected; the primary port is used for connecting a primary device; the secondary port is used for connecting asecondary device, wherein the region between a primary pin and a secondary pin of the isolation chip on the circuit board is a prohibited wiring region; the isolation chip is coated with an insulatingprotective layer; and the insulating protective layer is used for making the creepage distance of the isolation chip greater than or equal to a required creepage distance of the secondary device. Theisolated communication circuit of the present application reduces the possibility that the overvoltage is transmitted to the secondary device along the surface of the isolation chip and the circuit board, thereby realizing voltage isolation of the primary device and the secondary device; the isolation requirement for the secondary device in a high altitude environment can be met, and high-speed,low-power, and wall-to-wall communication between the primary and secondary devices is achieved.

Description

technical field [0001] The present application relates to the technical field of electronic communication equipment, in particular to an isolated communication circuit. Background technique [0002] Due to communication requirements, primary equipment such as computer equipment using mains power as a power supply and secondary equipment such as medical equipment powered independently usually need to be connected by a communication circuit; generally, one end of the communication circuit is connected to the computer through a USB (Universal Serial Bus) port. The device is connected, and the other end is connected to the medical device through a serial port such as UART (Universal Asynchronous Receiver / Transmitter). The communication circuit also includes a USB-to-UART chip for signal conversion between the USB port and the UART port. Realize high-speed, low-power consumption, long-distance, wall-penetrating wired communication. Although the voltage of the USB is 5V, which is...

AI Technical Summary

Problems solved by technology

[0004] However, when in a harsh environment such as a plateau, there are stricter requirements for voltage isolation performance due to the characteristics of thin air and thunderstorms on the plateau. Traditional isolated communication lines cannot meet the further requirements for voltage isolation performance in harsh environments such as plateaus.

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