High-reliability edge pulse generating circuit of intelligent power module

Abstract

The invention relates to a high-reliability edge pulse generating circuit of an intelligent power module. The high-reliability edge pulse generating circuit is designed based on a brand-new circuit design framework, and could be applied to high-side control signals with any pulse width. The high-reliability edge pulse generating circuit could ensure the normal output of a RESET pulse signal no matter the input signal has normal pulse width, or is a narrow pulse, even a super-narrow pulse so as to fundamentally solve the problem that a high-side output signal could not reset because of a narrow pulse input signal and reduce risk of straightway reliability of the MOSFET at the high side and the low side to effectively ensure the work stability of each module in the applied intelligent power module. And not only that, the high-reliability edge pulse generating circuit designed by the invention is simple in structure and overcomes the limitation of a traditional edge pulse generating circuit to input pulse width so as to save multi-level noise filter circuit in a signal transmission path, reduce the transmission delay of the signal and promote frequency of an operating switch.

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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