A high-reliability edge pulse generation circuit for intelligent power modules

Abstract

The invention relates to a high-reliability edge pulse generation circuit for an intelligent power module, which is based on a brand-new circuit design architecture and can be applied to high-side control signals with any pulse width, no matter whether the input signal is a normal pulse width, a narrow pulse, or even a super pulse width. The narrow pulse can ensure the normal output of the reset RESET pulse signal, which fundamentally solves the problem that the high-side output signal cannot be reset caused by the narrow pulse input signal, reduces the reliability risk of high-side and low-side MOSFET straight-through, and effectively guarantees all Apply the stability of the work of each module in the intelligent power module; not only that, the high-reliability edge pulse generation circuit designed by the present invention has a simple structure, which solves the limitation of the traditional edge pulse generation circuit on the input pulse width, thereby saving signal transmission. The multi-stage noise filter circuit in the path reduces the transmission delay of the signal and improves the working switching frequency.

Description

technical field [0001] The invention relates to a high-reliability edge pulse generating circuit for an intelligent power module, belonging to the field of driving circuit design of an intelligent power module. Background technique [0002] With the continuous advancement of electronic power technology, many power semiconductor devices continue to develop in the direction of high frequency, high power, intelligence and modularization, and end customers have more and more requirements for device performance, volume and reliability. high. The intelligent power module integrates the power switching device (IGBT or MOSFET) and the gate drive circuit (HVIC), and also integrates various protection functions. How to meet higher reliability requirements while improving integration is a major challenge for smart power modules. [0003] Such as figure 1 As shown, a commonly used three-phase intelligent power module includes U, V, W three-phase drive circuits. Each phase drive circ...

AI Technical Summary

Problems solved by technology

Since there is no reset RESET pulse signal, the RS latch cannot be reset normally, resulting in the high-side output signal HO output is always high, if the low-side control signal LIND input changes from low to high at this time, the low-side output signal LO output changes simultaneously High, the high-side MOSFET and the low-side MOSFET are turned on at the same time, the instantaneous through current will cause fatal damage to the MOSFET and the system, and affect the reliability of the system

In order to solve the above problems, the existing method is to add a noise filter circuit or an RC filter at the input end of the circuit, but simply adding a filter cannot fundamentally solve the problem

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