Importance

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Abstract

A power converter including transistors, a converter controller, and a functional safety controller that outputs a gate drive allowing signal. Further, there is shutoff circuitry that outputs a result of a logical conjunction using the gate pulse and the gate drive allowing signal as a drive signal, gate drive circuitry that outputs a gate signal on the basis of the drive signal, and a current detector that detects current flowing through a phase including the transistors and outputs a current value. After confirming on the basis of the current value and the gate signal that the gate signal changes to an on state during a period of no current flow through the transistor, the functional safety controller puts the gate drive allowing signal into a temporarily off state while the gate pulse is on and determines whether or not the gate signal changes to an off state.

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First Claim