Voltage adaptive circuit and PLC

Abstract

The invention discloses a voltage self-adaptive circuit and a PLC (Programmable Logic Controller). The voltage adaptive circuit comprises a voltage comparison module and a voltage adjustment module. The voltage comparison module is used for detecting the input voltage of the power interface and outputting a voltage adjustment signal of a corresponding gear. The voltage adjusting module is used for performing corresponding gear adjustment on the input voltage of the power interface according to the voltage adjusting signal so as to convert the voltage input by the interface into a preset working voltage, and the preset working voltage is equal to the working voltage of the PLC. According to the invention, the input voltage of the power interface of the PLC is automatically adjusted through the voltage self-adaptive circuit, the stability of the input voltage is ensured, the PLC can be connected with the power voltage in a larger range, and the PLC is protected at the same time.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a voltage adaptive circuit and a PLC controller. Background technique [0002] PLC (Programmable Logic Controller) is the core equipment of industrial control, and its stable operation is very important for normal production. In the industrial field, due to the complex working environment and conditions of the PLC controller, wrong line connection, grounding or short circuit of the signal line, lightning strikes on electrical equipment, etc., will cause the voltage of the input / output interface of the PLC controller to be unstable. [0003] The normal operation of the PLC controller requires a reliable and stable voltage. If the input and output (I / O) port voltage is too high or too low, it will affect the normal operation of the PLC controller, resulting in false commands, unstable signals, and even damage to the PLC controller. Moreover, since the PLC controller has a fixed wo...

AI Technical Summary

Problems solved by technology

In the industrial field, due to the complex working environment and conditions of the PLC controller, wrong line connection, grounding or short circuit of the signal line, lightning strikes of electrical equipment, etc., will cause the voltage of the input / output interface of the PLC controller to be unstable.

[0003] The normal operation of the PLC controller requires a reliable and stable voltage. If the input and output (I / O) port voltage is too high or too low, it will affect the normal operation of the PLC controller, resulting in false commands, unstable signals, and even damage to the PLC controller.

Moreover, since the PLC controller has a fixed working voltage, it needs to be connected to devices with the same working voltage. PLC controllers with different working voltages need to be configured with different devices, which limits the scope of application of the PLC controller and increases the cost.

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