Flextronics Ap, LLC

Flextronics Automotive, Inc.

Hyeong Han

A gate driver circuit which may include an input; high-side and low-side outputs; a signal conversion circuit configured to generate a high-side drive signal at the high-side output such that a delay time separates a transition of the high-side drive signal and a transition of a low-side drive signal at the low-side output; and a monitoring circuit configured to monitor a voltage at an output of a half-bridge and to pull the low-side output to a level for turning off a low-side switching device of the half-bridge on a condition that the voltage exceeds a voltage threshold. The monitoring circuit may control the low-side drive signal such that the delay time is a minimum delay necessary to prevent shoot-through of the half-bridge. The signal conversion circuit may generate the high-side drive signal such that the delay time is a minimum delay necessary to prevent shoot-through of the half-bridge.

Gate driver circuit for half bridge MOSFET switches providing protection of the switch devices

In one embodiment, a system for reducing component noise in a motor in a automobile includes a first gate driver and a second gate driver, a high side FET; a low side FET; a charge pump circuit; a high frequency reduction component; and a timing signal source. The timing source signal interconnected to the charge pump, the first gate driver, and the second gate driver, the first gate driver interconnected with the charge pump, the first gate driver interconnected with the high side FET, the high side FET and the low side FET interconnected with the high frequency reduction component, the timing signal source providing timing signals to the signals to the first gate driver, the second gate driver, and the charge pump circuit such that the PWM slope is dull enough to prevent RE EMC, wherein the timing signal source provides three timing signals.

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Markham, Canada

Hyeong Han