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4 -20mA回路供电故障保护

资料介绍
摘要:该电路提供了一个4-20mA电流环路灵活的故障保护。此外,它包括为恢复环路上施加的数字信号(如HART协议)的电路。

Maxim/Dallas > App Notes > CIRCUIT PROTECTION INTERFACE CIRCUITS

Keywords: 4-20mA current loop, fault protection, current limiting, current-sense amplifiers Apr 22, 2004

APPLICATION NOTE 3195
Add Fault Protection to 4-20mA Loop Supply

This circuit provides flexible fault protection for a 4-20mA current loop. In addition, it includes circuitry for
recovering digital signals (such as the HART protocol) imposed on the loop.


4-20mA current loops consist of a power source and current-measuring device at the control end, and a field
transmitter that senses process-variable information (like temperature or pressure) and converts it to a current
(Figure 1). Most 4-20mA industrial loops are powered by 24VDC, but that voltage can range from 12V to 36V.
The loop voltage in o……
4 -20mA回路供电故障保护
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