Infineon Technologies Austria Ag

Martina Arosio

Karl Norling

Sergio Morini

Christian Locatelli

Eslam Ramadan Mohamed Alfawy

Weidong Chu

A gate driver circuit includes a high-side region that operates in a first voltage domain; a low-side region that operates in a second voltage domain lower than the first voltage domain; a gate driver configured to drive a power switch between an on-state and an off-state with an adaptive dead time; a capacitor cross-coupled to the high-side region and the low-side region; a logic circuit configured to use the capacitor to detect a voltage transient of the power switch based on a first crossing of a threshold, and detect an end of the voltage transient based on a second crossing of the threshold; and an active-passive discrimination circuit configured to indicate whether the voltage transient is active or passive. The logic circuit is configured to regulate the adaptive dead time based on the second crossing of the threshold and based on the voltage transient being passive.

Gate driver with self-adjusted adaptive dead time

A gate driver has a supply voltage terminal, a bootstrap terminal connected to the supply voltage terminal, a driver having a power input terminal connected to the bootstrap terminal and an output connected to a gate control signal output terminal and configured to generate a gate drive signal at the gate control signal output terminal based on a voltage on the power input terminal, a clamp driver connected to the bootstrap terminal, a clamp transistor connected between a clamp signal input terminal and a reference voltage terminal and having a gate connected to the clamp driver, and an energy harvesting circuit connected between the clamp signal input terminal and the gate of the clamp transistor.

Gate driver

A gate driver circuit includes a gate driver and a sensing circuit. The gate driver is configured to generate an on-current during a plurality of turn-on switching events to drive a transistor, where a voltage across the transistor changes from a first value to a second value with a slope during the plurality of turn-on switching events, where the slope is of either an active type dependent on an amplitude of the on-current or a passive type. The sensing circuit determines whether the slope during a first turn-on switching event is the active type or the passive type, and regulates the amplitude of the on-current during a second turn-on switching event that is subsequent to the first turn-on switching event if the slope is the active type and to maintain the amplitude of the on-current as unchanged during the second turn-on switching event if the slope is the passive type.

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Pavia, Italy

Martina Arosio