Patent ID: 8514598

Claim:
Power converter designed to control an electrical load, comprising: a DC power supply bus to which a rectified voltage is applied and comprising a positive power supply line and a negative power supply line, an inverter module connected upstream to the DC power supply bus and downstream to several output phases, a bus capacitor, connected to the positive power supply line and to the negative power supply line of the DC power supply bus, a limiting resistor connected in series with the negative power supply line of the DC power supply bus, upstream of the bus capacitor, and designed to limit the charging current of the bus capacitor, the inverter module comprising several switching arms connected between the positive power supply line and the negative power supply line of the DC power supply bus, each switching arm comprising an upper transistor and a lower transistor in series and a centre connection point situated between the upper transistor and the lower transistor and connected to the electrical load, the upper and lower transistors being of the normally ON field-effect type, several Grid control devices each allowing a Grid voltage to be applied to the upper transistors and lower transistors for controlling them so as to close or to open, wherein, the Grid control devices for the lower transistors are each connected to the negative power supply line of the DC power supply bus, and in that the converter comprises a start-up source connected in parallel with the limiting resistor and to each Grid control device for the lower transistors and configured for charging with a negative voltage when the power converter starts up.