Low-cost DC voltage isolation collection circuit

A photoelectric isolation circuit and DC voltage technology, which is applied in voltage/current isolation, current/voltage measurement, and voltage-only measurement, can solve the problems of high cost and complicated circuit, and achieve the effect of low cost and simple circuit

Pending Publication Date: 2018-02-02
ZHUHAI TITANS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two kinds of DC voltage isolation acquisition circuits are widely used at present. The former adopts linear optocoupler plus isolated power supply, and the latter uses ADC dedicated chip, signal and isolated power supply. Both of them have the defects of high cost and complicated circuit.

Method used

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  • Low-cost DC voltage isolation collection circuit

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Embodiment Construction

[0010] Such as figure 1 As shown, the present invention includes a low-cost DC voltage isolation acquisition circuit, which includes a DC voltage input part 1, a resistive step-down part 2, an isolated voltage DC output part 5, and it also includes an isolated output feedback circuit 3, an operational amplifier The differential input circuit 4, the DC voltage input part 1, the resistive step-down part 2, the isolated output feedback circuit 3, the operational amplifier differential input circuit 4, and the isolated voltage DC output part 5 are electrically connected in sequence, and the DC voltage input part 1 The input terminal of the DC voltage input part 1 is connected to the DC voltage of different levels, and the output terminal of the DC voltage input part 1 is connected to the resistance mode step-down part 2, and the resistance mode step-down part 2 is connected to the output voltage of the DC voltage input part 1. Input the input end of the isolated output feedback ci...

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Abstract

The invention discloses and provides a low-cost direct current voltage isolation acquisition circuit, which includes a direct current voltage input part, a resistive step-down part, an isolated output feedback circuit, an operational amplifier differential input circuit, an isolated voltage direct current output part, and a resistive step-down Part of the output voltage of the DC voltage input part is step-down and limited, and then input to the input of the isolated output feedback circuit. The output of the isolated output feedback circuit is divided into two parts: the isolated output and the feedback signal, and the differential input circuit of the operational amplifier and the isolated voltage. The DC output parts are connected, and the DC isolation voltage is output from the DC output part of the isolation voltage. Due to the use of ordinary dual photoelectric isolation circuits and operational amplifier circuits, the corresponding feedback circuit is introduced to realize the DC voltage isolation and acquisition functions, one way is used as input, the other way is used as feedback, and the corresponding isolated DC voltage is output. Therefore, it has the advantages of low cost and simple circuit.

Description

technical field [0001] The invention relates to a DC voltage acquisition circuit, in particular to a low-cost DC voltage isolation acquisition circuit. Background technique [0002] At present, there are mainly two types of DC voltage isolation acquisition circuits: (1) Linear optocoupler plus isolated DC-DC power supply. This solution is to isolate and transmit analog signals through linear optocoupler, and the isolated DC-DC provides power isolation for linear optocoupler. ; (2) DC-DC power supply composed of ADC dedicated chip, signal, and power isolation. This solution is to collect analog signals through a dedicated ADC chip, and output the corresponding analog voltage value through a digital isolation chip and power supply. The two kinds of DC voltage isolation acquisition circuits widely used at present, the former adopts linear optocoupler plus isolated power supply, and the latter adopts ADC dedicated chip, signal, and isolated power supply. Both of them have the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/22G01R15/06G01R19/00
CPCG01R15/22G01R15/06G01R19/0084
Inventor 吴华利潘慕军周凌户金涛
Owner ZHUHAI TITANS TECH
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