Gate control circuit for MOS transistor

A gate control circuit for a power component with a capacitive input such as a power MOS transistor exhibiting an input capacitance, wherein a gate of said power component is in series with an inductance, comprising:

• an auxiliary capacitor;
• means for precharging said auxiliary capacitor;
• first means comprising a first switch in series with a diode of a first polarity for transferring energy stored in the auxiliary capacitor through said inductance to the input capacitance during a switching on condition of said power component;
• and
• second means comprising a second switch in series with a diode of a second polarity for transferring back to the auxiliary capacitor through the inductance energy stored in the input capacitance during a switching off condition of said power component.

A gate control circuit for a power component with a capacitive input such as a power MOS transistor exhibiting an input capacitance, wherein a gate of said power component is in series with an inductance, said inductance being precharged, comprising:

• first means for transferring energy stored in the inductance to the input capacitance during a switching on condition of said power component;
• and
• second means for transferring back to the inductance energy stored in the input capacitance during a switching off condition of said power component;
• wherein said first and second transferring means are formed by four switches with anti-parallel diodes to form a bridge, a first diagonal of said bridge being connected across a supply source having a capacitor in parallel therewith and a second diagonal of said bridge being connected across said inductance, one of the terminals of said inductance being connected to the gate of the power MOS transistor.

A gate control circuit for a power component with a capacitive input such as a power MOS transistor exhibiting an input capacitance, wherein a gate of said power component is in series with one end of an inductance, comprising:

• means for precharging said input capacitance;
• first means connected to the other end of said inductance for transferring energy stored in the input capacitance through said inductance during a switching on condition of said power component;
• and
• second means connected to the other end of said inductance for transferring back energy stored in the input capacitance through said inductance during a switching off condition of said power component;
• wherein said means for precharging said input capacitance are connected between said inductance and the gate of the MOS transistor, the first transferring means comprise a switch in series with a diode of a first polarity and the second transferring means comprise a switch and a diode having an opposite polarity.