Multi-channel switching value input circuit system with novel structure

Abstract

The invention discloses a multi-channel switching value input circuit system with a novel structure, and relates to the technical field of switching value output channels, the multi-channel switching value input circuit system comprises an optical coupler, a light emitting diode, a control power supply and a driving power supply, the optical coupler is composed of a light emitting part, a light receiving part and a signal amplification part; the input end of the optical coupler belongs to a low-resistance element working in a current mode, so that the optical coupler has very strong common-mode rejection capability; therefore, the signal-to-noise ratio can be greatly improved when the antenna is used as a terminal isolation element in long-line information transmission; an interface device is used for signal isolation in computer digital communication and real-time control, so that the working reliability of the computer can be greatly improved; and an optocoupler feedback circuit formed by a linear optical coupler is utilized, the duty ratio is changed by adjusting the current of a control end, the purpose of precise voltage stabilization is achieved, a high-voltage power supply can be fundamentally prevented from being connected into DCS and PLC clamping pieces in series, and the protection performance and reliability of the DCS and the PLC are improved.

Description

technical field [0001] The invention relates to the technical field of switching value output channels, in particular to a multi-channel switching value input circuit system with a new structure. Background technique [0002] The switch output channel refers to an isolated channel in order to prevent the interference of the external circuit, that is, there is no direct electrical connection between the DO channel and the host. Since DO is generally used to directly drive or drive electrical equipment through relays, it is important to understand its drive capability. The DO channel of some digital regulators is directly drawn from the optical isolation or low-power switching circuit, and its driving capacity is not greater than 20mA. At this time, to drive an electrical device (such as an AC contactor of a motor, a single-phase motor of an electric valve, an electric heater, etc.), an intermediate relay must be passed. The DO channel of some on-site industrial computers ha...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem in the prior art that high-voltage power supply is connected in series with DCS and PLC cards during work, so that the protection performance and reliability of DCS and PLC are greatly reduced, causing unnecessary troubles. A New Structure Multi-channel Digital Input Circuit System Proposed

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