Interface circuit compatible with multi-level input

Abstract

The invention relates to an interface circuit compatible with multi-level input and belongs to the integrated circuit technological field. The interface circuit includes a reference pre-voltage stabilization module, a reference core module, a hysteresis comparison module and a threshold value control module; the reference pre-voltage stabilization module is used for converting a power source voltage into a stable low-power source voltage provided for the reference core circuit; the reference core module is used for generating a first reference voltage and a second reference voltage; and the hysteresis comparison module obtains the first reference voltage or the second reference voltage under the control of the threshold value control module so as to compare the first reference voltage or the second reference voltage with input signals. The interface circuit compatible with the multi-level input of the invention can be adopted as the interface circuit of an IPM. The interface circuit compatible with the multi-level input has the advantages of compatibility with a plurality of different input levels, wide range of power supply voltages, stable anti-noise capacity under different working voltages and temperatures, small area and low cost.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits and relates to an interface circuit, in particular to an interface circuit compatible with multi-level input, which can be applied to an IPM module. Background technique [0002] IPM (Intelligent Power Module, intelligent power module) packs the drive circuit, IGBT chip, freewheeling diode and various protection circuits in the same module, which reduces the module volume, greatly improves the integration level, and is also more intelligent . Compared with a single IGBT module, the IPM integrates drive and protection circuits, logic control, protection and detection in one, with complete functions and higher reliability. The interface circuit is responsible for the identification of external input control signals, and is the entrance for the IPM module to interact with external signals. The ability of the interface circuit to recognize the external input control signal directly deter...

AI Technical Summary

Problems solved by technology

[0011] In view of the lack of level compatibility of the interface circuit realized by the above-mentioned traditional Schmitt trigger, and the shortcomings of the interface circuit realized by the traditional hysteresis comparator, which occupies a large area and has high cost, the present invention proposes an interface compatible with multi-level input circuit, compatible with various input levels, has the characteristics of stable anti-noise ability, small area and low manufacturing cost

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