Digital Acquisition Circuits and Systems

Abstract

The invention provides a digital acquisition circuit and a system. The circuit comprises a voltage input port, a voltage output port, an optical coupler, a triode, a pull-up resistor, and four voltage dividing resistors. The voltage input port is connected with the first voltage dividing resistor and a second voltage dividing resistor respectively; the voltage output port is connected with the output end of the optical coupler and the pull-up resistor respectively. The triode is connected with the first voltage dividing resistor, the second voltage dividing resistor and the fourth voltage dividing resistor respectively; the input end of the optical coupler is connected with the third voltage dividing resistor and the fourth voltage dividing resistor respectively and the output end is connected with the pull-up resistor. The pull-up resistor is used to connect a voltage source. The voltage input port is used to input external voltage, and if the external voltage is below a preset voltage, the voltage output port outputs a first voltage and indicates that the external voltage is an invalid voltage; if the external voltage is above the preset voltage, the voltage output port outputs a second voltage and indicates that the external voltage is a valid voltage. As a triode is integrated, the internal current of the digital acquisition circuit is increased considerably, therefore, increasing the anti-interference performance of the circuit.

Description

technical field [0001] The embodiments of the present invention relate to the field of circuit technology, and in particular to a digital acquisition circuit and system. Background technique [0002] Digital acquisition is the basic and most important part of the control system, and it is the part in direct contact between the system and the control terminal. The stability and reliability of the digital acquisition circuit will directly determine the stability and reliability of the whole system. The current digital acquisition circuit is composed of resistors and optocouplers. The internal current of the digital acquisition circuit formed in this way is relatively small, so the anti-interference ability of the digital acquisition circuit is poor. Contents of the invention [0003] Embodiments of the present invention provide a digital acquisition circuit and system, which are used to increase the internal current of the digital acquisition circuit, thereby enhancing the ...

AI Technical Summary

Problems solved by technology

The current digital acquisition circuit is composed of resistors and optocouplers, the internal current of the digital acquisition circuit formed in this way is small, so the anti-interference ability of the digital acquisition circuit is poor

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