A receiving circuit of an isolated driving circuit

Abstract

The application provides a receiving circuit for an isolated drive circuit, including: a differential pair input module, used to receive a common-mode input voltage signal, and suppress noise of the common-mode input voltage signal; a current generation and mirror circuit, used to receive the first Enable signal, and when the first enable signal is turned on, four current biases are generated; the input and output ends of the common mode feedback circuit are connected to the current generation and the two current biases of the mirror circuit, which are used to improve the loop common mode Gain, stabilize the common-mode signal output by the differential pair input module; the two input terminals of the pre-amplification circuit are connected to two current biases, which are used to amplify the common-mode signal output by the differential pair input module to improve the bandwidth of the circuit; comparison circuit The two input ends of the pre-amplification circuit are respectively connected to the two output ends of the pre-amplification circuit, which are used to receive the differential mode signal output by the pre-amplification circuit, and output the comparison result after comparison; the low-pass filter circuit is used to receive the comparison result and perform low-pass After filtering, it is output as the received signal.

Description

technical field [0001] The invention relates to the design field of a SiC high-voltage isolation drive integrated circuit for a new energy vehicle, in particular to a receiving circuit of an isolation drive circuit. Background technique [0002] SiC is the core power device of the third-generation semiconductor of new energy vehicles. In order to reasonably control the on and off of SiC devices, detect and protect SiC devices, driving and protection circuits are essential. [0003] With the development of the third-generation semiconductor SiC in terms of high-voltage and high-speed device characteristics, in terms of handling high-voltage and high-power, the high-voltage and low-on-resistance characteristics of SiC have more and more advantages compared with traditional silicon-based power devices, but Every high-voltage SiC device needs a corresponding drive circuit to realize the control from the MCU to the high-voltage switch SiC, and the voltage at the MCU end is only 1...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a receiving circuit suitable for an isolated drive circuit to solve the problems of poor signal quality and low transmission reliability caused by severe high-speed common-mode interference at the receiving end of the isolated drive transceiver circuit in the prior art

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