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A digital isolator and its common-mode interference suppression circuit

A technology of digital isolator and suppression circuit, which is applied in the direction of instruments, regulating electric variables, control/regulation systems, etc., can solve problems such as communication failure and limited common-mode range of differential structures

Active Publication Date: 2022-03-18
SUZHOU NOVOSENSE MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limited common-mode range of the differential structure adopted by the digital isolator, when the common-mode voltage exceeds the common-mode range, it will cause communication failure

Method used

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  • A digital isolator and its common-mode interference suppression circuit
  • A digital isolator and its common-mode interference suppression circuit
  • A digital isolator and its common-mode interference suppression circuit

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Embodiment Construction

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0042]The core of the invention is to provide a digital isolator and its common-mode interference suppression circuit. When the digital isolator is subjected to common-mode interference, the common-mode interference suppression circuit acts to compensate the common-mode current input by the signal demodulation circuit in the digital isolation, and limits the common-mode voltage to a small fluctuation range to ensure normal signal transmission, ...

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Abstract

The invention discloses a digital isolator and its common-mode interference suppression circuit, wherein the circuit includes a differential circuit and a common-mode current compensation circuit. The differential circuit includes a first resistor and a second resistor, and free ends of the first resistor and the second resistor are respectively connected to differential signal input terminals. The common-mode current compensation circuit includes at least one current mirror, the current mirror includes a first switch tube and a second switch tube, the control terminals of the first switch tube and the second switch tube are connected to each other as the control terminal of the current mirror, and connected to the first resistor Connect to the common end of the second resistor. When the digital isolator is subjected to common-mode interference and the voltage at the control terminal of the current mirror does not reach the turn-on voltage, the differential circuit works to reduce the common-mode interference. When the voltage at the control terminal of the current mirror reaches the turn-on voltage of the current mirror, the current mirror turns on to compensate the input common-mode current, avoiding the common-mode voltage exceeding the common-mode range of the differential structure, resulting in communication failure, and enhancing the digital isolator anti-interference ability.

Description

technical field [0001] The invention relates to the field of digital isolators, in particular to a digital isolator and a common-mode interference suppression circuit thereof. Background technique [0002] Digital isolators can be divided into optocoupler isolation, capacitive isolation, magnetic coupling isolation and giant magnetoresistance isolation according to different technical methods. In a complex application environment, a comprehensive electronic system has many subsystems, and the data of each subsystem Crosstalk will occur during transmission, and digital isolators can isolate any subsystem from other systems and protect it from noise and high voltage. With the intelligentization of industrial and communication equipment, the market demand for digital isolators is increasing day by day, and its performance requirements are also getting higher and higher. One of the first problems to be solved when designing and inventing a digital isolator is common-mode transi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/26
CPCG05F3/262
Inventor 林涛罗頔诸弘超盛云
Owner SUZHOU NOVOSENSE MICROELECTRONICS CO LTD