binary input circuit

Abstract

The invention relates to a binary input circuit. The binary input circuit comprises multiple binary input ends and a common end, and the binary input ends are connected to the common end via the same circuit node. The binary input circuit further comprises a threshold selection circuit, the threshold section circuit is connected between the circuit node and the common end, and comprises a voltage stabilizer and a switch device, and the voltage stabilizer is connected with the switching device in parallel. When the switching device is in the first state, the circuit node is connected with the common end via the voltage stabilizer; and when the switching device is in the second state, the circuit node is connected with the common end via the switching device. According to the binary input circuit in the invention, only the threshold selection circuit is arranged between the circuit node and the common end, so that wiring of the circuit is simpler and more flexible, the amount of devices in the circuit is greatly reduced, the circuit is easier to realize, and the circuit cost is reduced.

Description

technical field [0001] The invention relates to a binary input circuit, in particular to a binary input circuit applicable to various threshold voltages. Background technique [0002] A binary input circuit is a commonly used electronic circuit, which is widely used in protection and monitoring devices, such as protective relays, remote terminal units for power distribution automation, power monitoring devices, and the like. Binary input circuits in these devices are usually used to obtain the status of circuit breakers, switches, etc., and can also be used to obtain switch position information, switch pressure signals, communication status, protection operation signals, terminal abnormal signals, switch energy storage status, etc. [0003] figure 1 A typical binary input circuit 10 is shown. Such as figure 1 As shown, the binary input circuit 10 is used to convert the input voltage Vi provided to the binary input circuit 10 into a level signal (high level or low level) r...

AI Technical Summary

Problems solved by technology

and figure 1 The binary input circuit 10 shown is the same, and the branch of each input terminal of the binary input circuit 20 generally includes a protection circuit 11, a threshold selection circuit 12 and an isolation circuit 13, so as to protect the branch of each input terminal from Will be damaged by overcurrent or overvoltage, the input voltage of each input terminal is converted into a level signal recognizable by the processor 14, and the input voltage of each input terminal is electrically isolated from the processor 14, which makes the binary The circuit implementation complexity and cost of the input circuit 20 will increase accordingly

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