Patent ID: 9083257
Filing Date: 2015-07-14
Classification: H02M,Y02B

Abstract:
1. A power conversion circuit comprising: a normally-off, high-side transistor and a normally-on, low-side transistor that are series-coupled to each other to form a half-bridge circuit; a first drive circuit which drives a gate of the high-side transistor; and a second drive circuit which drives a gate of the low-side transistor, wherein the first drive circuit controls switching of the high-side transistor in accordance with an input pulse width modulation (PWM) signal when a first power supply voltage for the second drive circuit is lower than a first reference voltage, and the first drive circuit turns off the high-side transistor when the first power supply voltage for the second drive circuit is higher than the first reference voltage, and wherein the second drive circuit outputs a drive signal to the gate of the low-side transistor in accordance with the first power supply voltage, which is supplied as a low-potential power supply voltage.