Direct-current positive/negative signal isolation and conversion method and circuit thereof

A bipolar signal, isolated conversion technology, applied in the direction of converting DC power input to DC power output, output power conversion devices, electrical components, etc., to solve signal drift, improve conversion accuracy and linearity, and low prices.

Inactive Publication Date: 2010-06-30
MORNSUN GUANGZHOU SCI & TECH
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  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for isolation and conversion of DC positive and negative bipolar signals, which greatly improves the accuracy of signal conversion and reduces the temperature drift coefficient, solves the problem of signal drift, and at the same time reduces product cost and product volume

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  • Direct-current positive/negative signal isolation and conversion method and circuit thereof
  • Direct-current positive/negative signal isolation and conversion method and circuit thereof
  • Direct-current positive/negative signal isolation and conversion method and circuit thereof

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Embodiment Construction

[0021] The present invention can be realized by the following preferred specific implementation circuit: as Figure 4 As shown, it includes an input signal processing unit, a MOSFET modulation unit including MOS transistors Q1 and Q2, a MOSFET demodulation unit including MOS transistors Q3 and Q4, an output signal processing unit, an isolated drive unit, and an isolated coupled The main signal transformer T1, the signal transformer T1 is a main signal isolation coupling transformer with the same number of turns on the primary side and the secondary side, to realize the isolated transmission of the DC positive and negative bipolar current signals after chopping and inverting.

[0022] The input signal processing unit above is mainly composed of an operational amplifier U1A and a resistor R1 to realize the voltage-current conversion of the input DC positive and negative bipolar signals. The DC positive and negative bipolar voltage signal Vin is input to the non-inverting input t...

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Abstract

The invention discloses a direct-current positive/negative signal isolation and conversion method and a circuit thereof. A MOSFET regulation circuit is arranged in a direct-current positive/negative signal input loop connected with the primary winding of a signal transformer, and a MOSFET regulation circuit is arranged in a direct-current positive/negative signal output loop connected with the secondary winding of the signal transformer; the synchronous drive signals outputted by the primary and the secondary windings of a drive transformer respectively control the synchronous switching of switching transistors in the MOSFET regulation circuits in order to chop and invert direct-current positive and negative signals, the chopped and inverted signals are isolated and coupled out by the signal transformer, and thereby the isolation and conversion of the direct-current positive and negative signals are fulfilled. The method greatly increases the precision of signal conversion and reduces the temperature drift coefficient, thus solving the problem of signal drift, meanwhile, the product cost is reduced, and the product size is reduced.

Description

technical field [0001] The invention relates to a signal processing method and a circuit thereof, in particular to a method for isolating and converting DC positive and negative bipolar signals and a circuit thereof. Background technique [0002] In the field of industrial control, it is common to use DC positive and negative bipolar signals as voltage drive signals, such as PLC, transmitter, motor control, etc. In practical applications, in order to effectively suppress the common mode noise and common ground interference between the control equipment and the execution equipment, and realize the signal matching and impedance matching between the control equipment interface and the execution equipment interface, the DC positive and negative bipolar signals are usually effectively Isolate and convert to achieve the above. [0003] In the prior art, the implementation method of isolation and conversion of DC positive and negative bipolar signals is usually as follows: figure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
Inventor 陈超扬陶小丽
Owner MORNSUN GUANGZHOU SCI & TECH
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