Alternating-current direct-current adaptive switching value collecting circuit and method

Abstract

The invention provides an alternating-current direct-current adaptive switching value collecting circuit and method, relating to the technical field of electric power automation and used for facilitating software maintenance and reducing hardware cost. The circuit comprises a CPU (Central Processing Unit), a CPU side power supply, an auxiliary power supply, an auxiliary power supply signal input loop and a switching value signal input loop; the switching value signal input loop comprises a switching value isolating opto-coupler, a switching value limit resistor, a switching value voltage-regulator tube and a switching value output switch arranged in a collecting field, the switching value signal input loop is used for collecting switching value signals output by the switching value output switch; the auxiliary power supply signal input loop comprises an auxiliary signal isolating opto-coupler, an auxiliary signal limit resistor and an auxiliary signal voltage-regulator tube and is used for collecting auxiliary signals output by the auxiliary power supply, wherein the resistance value of the auxiliary signal limit resistor is larger than that of the switch limit resistor. The collecting circuit and method provided by the invention have the advantage of low hardware cost and convenience for software maintenance.

Description

technical field [0001] The invention relates to electric power automation technology, in particular to an AC / DC self-adaptive switching value acquisition circuit and its acquisition method. Background technique [0002] In electric power automation devices, the application of switching value acquisition is very common. The state acquisition of the switching value's opening and closing must rely on the auxiliary power supply, which is usually directly taken from the power supply in the electric automation device. Since the power supply in the electric automation device is divided into DC and AC, the auxiliary power source used for switch value collection is also divided into DC and AC. Constant high level, when the auxiliary power supply is an AC power supply, the switching signal collected in the state of switch closing is a pulse signal. [0003] In order to adapt to two different switching signals, the electric automation device usually adopts the following two coping me...

AI Technical Summary

Problems solved by technology

[0003] In order to adapt to two different switching signals, the electric automation device usually adopts the following two coping methods: 1) Set up two sets of software processing schemes, one set corresponds to the switching signal of the auxiliary power supply as DC power supply, and the other set corresponds to the auxiliary power supply as Switching signal of AC power supply, this method needs to maintain two sets of programs at the same time, which brings trouble to software maintenance; 2) Add rectifier bridge and filter capacitor in the switching signal acquisition circuit of each auxiliary power supply of AC power supply (see image 3 ), the collected pulse signal is rectified and filtered into a DC signal and then collected by the CPU. This method will lead to complex hardware loops, increased circuit board area, and increased hardware costs.

Images