CPC H02M 1/08 (2013.01) [H02M 1/0006 (2021.05); H02M 1/32 (2013.01)] | 11 Claims |
1. A voltage generation circuit configured to generate a control power supply voltage for a high-side drive circuit for operating the high-side drive circuit that controls a state of a high-side switching element, the high-side switching element and a low-side switching element connected in series with each other, the voltage generation circuit comprising:
a bootstrap circuit including a diode having a cathode connected to a high potential side of the high-side drive circuit to which the control power supply voltage for the high-side drive circuit is applied, and a current limiting resistor connected in series to the diode; and
a step-down circuit connected to a high potential side of the high-side switching element and an input side of the bootstrap circuit, and configured to output a compensated power supply voltage to the bootstrap circuit, the compensated power supply voltage being generated by stepping down a power supply voltage which is applied to the high potential side of the high-side switching element, and being a voltage for generating the control power supply voltage for the high-side drive circuit via the bootstrap circuit, wherein
the step-down circuit generates the compensated power supply voltage obtained by adding a compensation voltage corresponding to a voltage drop due to the diode and the current limiting resistor to a control power supply voltage for a low-side drive circuit for operating the low-side drive circuit that controls a state of the low-side switching element.
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