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Voltage isolation sampling method and circuit

A voltage isolation and sampling circuit technology, applied in the direction of logic circuit connection/interface layout, logic circuit coupling/interface using field effect transistors, etc., can solve the problems of high price and sampling circuit cost, improve control accuracy, reduce circuit cost effect

Pending Publication Date: 2021-02-09
SHANGHAI HUGONG ELECTRIC WELDING MACHINE MFG
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  • Abstract
  • Description
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Problems solved by technology

Although this scheme can achieve better isolated sampling, but this scheme uses a linear optocoupler with feedback function, which is expensive, which in turn leads to a higher cost of the entire sampling circuit

Method used

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  • Voltage isolation sampling method and circuit
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  • Voltage isolation sampling method and circuit

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Embodiment Construction

[0058]The following is attachedFigure 1-10Give further details on this application.

[0059]The embodiment of the application discloses a voltage isolation sampling method. Referencefigure 1 , A voltage isolation sampling method mainly includes the following steps:

[0060]Step S100, obtaining a voltage input signal;

[0061]Specifically, the voltage input signal is provided by a voltage generating circuit. The voltage generating circuit can be composed of a potentiometer or a single-chip microcomputer, and the voltage value output by the voltage generating circuit can be changed according to the situation. For example: when using a potentiometer to output a voltage input signal, move the brush along the resistor body to obtain a voltage that has a certain relationship with the displacement; when a single-chip microcomputer is used to provide a voltage input signal, the voltage input can be controlled by outputting high and low levels Signal output.

[0062]Step S200, performing error amplifica...

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Abstract

The invention relates to the technical field of circuit control, in particular to a voltage isolation sampling method and circuit, and the method comprises the steps: obtaining a voltage input signal;performing error amplification processing on the voltage input signal, and outputting a characteristic voltage signal; and the arc voltage output by the welding machine is controlled according to thecharacteristic voltage signal, and the characteristic voltage signal and the arc voltage are in a proportional relation. The voltage isolation sampling circuit has the effect of realizing voltage isolation sampling with low cost and a simple circuit.

Description

Technical field[0001]This application relates to the field of circuit control technology, in particular to a voltage isolation sampling method and circuit.Background technique[0002]In the application of electric welding machines, there are many welding process parameters. Among them, the arc voltage is a key parameter in the welding specification, which refers to the voltage from the torch contact tip to the workpiece, which has the greatest impact on whether the arc is stable or not. The magnitude of the arc voltage is determined by the length of the arc and the transition form of the droplet, which has a great influence on the stability of the welding process, weld formation, spatter, welding defects and the mechanical properties of the weld. Therefore, in order to achieve corresponding control of the welding process, real-time sampling of the arc voltage is required.[0003]At present, most of the linear optocoupler isolation feedback methods are used to sample the arc voltage of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0185
CPCH03K19/0185
Inventor 不公告发明人
Owner SHANGHAI HUGONG ELECTRIC WELDING MACHINE MFG
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