| CPC H02H 7/1213 (2013.01) [H02M 1/088 (2013.01); H02M 3/158 (2013.01)] | 4 Claims |
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1. A power converter comprising:
a pair of transistors connected in series to be used in power conversion;
a converter controller configured to output a gate pulse specific to each of the transistors in performing on and off control of the transistors;
a functional safety controller configured to output a gate drive allowing signal specific to each of the transistors in an on state when not determining integrity of a gate shutoff function for the transistors;
a pair of shutoff circuitries, corresponding to the pair of transistors respectively, each configured to output a result of a logical conjunction that uses the gate pulse and the gate drive allowing signal;
a pair of gate drive circuitries corresponding to the pair of transistors respectively, each configured to output a gate signal to drive the transistor on a basis of the drive signal to the transistor and the functional safety controller; and
a current detector configured to detect current flowing through a phase including the pair of transistors and configured to output a detection result as a current value to the functional safety controller, wherein
for each of the transistors, after confirming on a 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 is configured to:
put the gate drive allowing signal into a temporarily off state while the gate pulse is on; and
determine whether or not the gate signal changes to an off state.
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