Complementary MOSFET Gate Driver for Fast Low-Power Switching
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Solution Overview
Problem
Existing gate driver circuits for semiconductor power switches face challenges in achieving fast switching speed with low power consumption, particularly in translating logic level signals and managing turn-on and turn-off output resistances effectively.
Innovation Solution
A driver circuit comprising complementary P-channel and N-channel metal-oxide-semiconductor field-effect transistors (MOSFETs) with a half-bridge pre-driver configuration and voltage limiter, along with a pull-up resistor, is used to drive semiconductor power switches, enabling fast switching with low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a simple resistor and P-channel MOSFET inverter is used as a pre-driver, then power consumption is low, but switching speed is slow
Solution Approach 1:
The patent combines a P-channel MOSFET and an N-channel MOSFET into a complementary pre-driver stage, merging the advantages of both transistor types to achieve fast switching with low power consumption
Solution Approach 2:
The pre-driver circuit dynamically switches between different transistor configurations during turn-on and turn-off cycles, using the N-channel MOSFET for fast turn-on and the P-channel MOSFET for controlled turn-off, optimizing both speed and power consumption at different phases
2Speed
If the pre-driver is designed for fast switching, then switching speed is high, but power consumption is high
Solution Approach 1:
The patent applies different transistor types with complementary characteristics to different parts of the switching cycle - using N-channel MOSFET for the turn-on phase where high current is needed and P-channel MOSFET for the turn-off phase where controlled discharge is needed, optimizing local performance for each phase
Solution Approach 2:
The complementary pre-driver operates in periodic cycles, alternating between the N-channel MOSFET dominating during turn-on and the P-channel MOSFET dominating during turn-off, achieving fast switching only when needed while consuming minimal power during steady states
3Device complexity
If bipolar gate driver is used, then circuit simplicity is maintained, but voltage utilization is poor and speed is limited
Solution Approach 1:
The patent changes the fundamental parameters of the gate driver by transitioning from bipolar transistors to complementary MOSFETs, enabling higher voltage utilization, faster switching speeds, and the ability to apply different output resistances for turn-on and turn-off while maintaining reasonable circuit complexity
Data Source
Figure 1
AI summary
A driver circuit (10) for controlling a semiconductor power switch (Q7) comprises a first power driver transistor (QS) and a second power driver transistor (Q5) complementary to the first power driver transistor (08). Both power driver transistors (Q5, Q6) have an output terminal connected to an input terminal (34) of the semiconductor power switch (Q7). An input terminal of the second power driver transistor (Q5) is connected to a half bridge circuit comprising a; first pre-driver transistor (Q3) and a second pre-driver transistor (04) complementary to the first pre-driver transistor CLEMENTS, Neal, D. (4410 9th Avenue South, Apt. 303Fargo, ND, 58103, US) US2012/025803 08/30/2012 02/20/2012 Click for automatic bibliography generation DEERE & COMPANY (One John Deere Place, Moline, IL, 61265, US) CLEMENTS, Neal, D. (4410 9th Avenue South, Apt. 303Fargo, ND, 58103, US) G05F3/16 Download PDF WO/2012/115900A3 PDF help BARTHOLOMEW, Darin, E. (Deere & Company, Global Intellectual Property ServicesOne John Deere Plac, Moline IL, 61265, US)