Digital separation method for noise in magnetic coupling digital isolator
A technology of digital isolator and separation method, which is applied in the direction of logic circuit using optoelectronic equipment and logic circuit using specific components, etc. It can solve the problem that the circuit design and anti-noise performance cannot be well balanced, and achieve low power consumption, Fast, robust effects
Active Publication Date: 2021-07-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0004] Aiming at the problem that the current noise suppression method based on the magnetic coupling digital isolator cannot balance well between the circuit design and the anti-noise performance, the present invention proposes a digital separation method of noise in the magnetic coupling digital isolator, which can take into account the magnetic Circuit Design Ease and Practical Noise Immunity Performance of Coupled Digital Isolators
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[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but 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.
[0022] The present invention is applicable to magnetically coupled digital isolators, such as figure 1 As shown, the magnetic coupling digital isolator includes an encoding module, an isolation transformer, a decoding module and a load, and the isolation transformer includes a primary coil and a secondary coil.
[0023] The encoder (Encoder) module in the primary coil drive circuit of the isolation transformer is used to encode the input signal of ...
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A digital separation method for noise in a magnetic coupling digital isolator is disclosed, a coding module in the magnetic coupling digital isolator is used for generating two continuous pulse signals at each rising edge and each falling edge of an input signal of the magnetic coupling digital isolator and inputting the two continuous pulse signals into a primary coil of an isolation transformer; so that a secondary coil of the isolation transformer induces and generates a secondary coil output signal; change of the load end of the magnetic coupling digital isolator can generate a noise signal, and the noise signal and the output signal of the secondary coil are jointly used as an input signal of a decoding module; the decoding module is used for detecting the input signal of the decoding module, judging whether the input signal of the decoding module is a noise signal or a secondary coil output voltage when a rising edge appears after a set time, keeping the output signal of the decoding module unchanged if the input signal is the noise signal, and overturning the output signal of the decoding module if the input signal is the secondary coil output voltage. Thus, the load driving signal and the input signal of the magnetic coupling digital isolator are synchronized.
Description
technical field [0001] The invention belongs to the technical field of integrated circuits and relates to a digital separation method for common mode noise of a magnetic coupling digital isolator. Background technique [0002] In large motor applications, when the motor control switching circuit produces a step change in the bridge voltage, common-mode voltage changes across the isolation barrier can generate noise. Magnetically coupled digital isolators are particularly sensitive to this noise. There are currently several effective noise suppression methods: based on the amplitude-frequency characteristics of the signal noise of the isolator, the use of high-pass filters and voltage thresholds to improve CMR (common-mode noise rejection ability); introduce two secondary coils, through the crossover configuration of the secondary coils, double the useful differential mode signal and cancel the useless common mode noise signal, thereby suppressing the noise of the isolator; a...
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IPC IPC(8): H03K19/14
CPCH03K19/14
Inventor 卜宁方健
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA