Abstract: An apparatus includes a power converter configured to provide a constant current charge to a capacitor coupled to a high voltage bus through a mechanical contact, an isolation interface configured to receive a pre-charge signal on a primary side of the isolation interface, and convert the pre-charge signal into a bias voltage signal and a control command signal on a secondary side of the isolation interface, and based on the bias voltage signal and the control command signal, a constant current control unit configured to generate a gate drive signal for the power converter.

Abstract: A trench gate power MOSFET, including: a substrate provided with a hexagonal wide bandgap semiconductor of a first conductivity type; an epitaxial layer grown on the substrate and of the first conductivity type; a body region formed on the epitaxial layer and of a second conductivity type; a trench formed in the body region by etching, where a length direction of the trench is parallel to a projection, on the surface of a wafer, of the C axis; a second conductivity-type pillar formed by implanting first ions into a bottom region of the trench along the C axis of the hexagonal wide bandgap semiconductor material, where the bottom region of the trench is located below the trench, and is connected to the bottom of the trench, and the longitudinal depth of the second conductivity-type pillar is at least not less than 50% of the thickness of the epitaxial layer located in the bottom region of the trench; and a trench gate formed by filling the trench with a filler.

Abstract: The present disclosure relates to a totem pole bridgeless power factor correction device and a power supply system. The device includes a power factor correction module. The power factor correction module includes a first transistor, a second transistor, a third transistor, a fourth transistor, an inductor and a control module for generating a zeroth control signal in the first time period to control the third transistor and the fourth transistor to be in an off state, performing a zero-crossing detection on an AC voltage in the first time period, generating a first control signal to control a conduction state of the first transistor and the second transistor before the AC voltage crosses zero, and generating a second control signal to control the conduction state of the first transistor and the second transistor after the AC voltage crosses zero.

Abstract: An apparatus includes a capacitor coupled to a gate of a power switch, and a negative voltage adjustment device connected to a common node of the capacitor and the gate of the power switch, wherein the negative voltage adjustment device is configured such that after a turn-off signal is applied to the gate of the power switch, a voltage across the capacitor is maintained at a predetermined voltage level through a negative current provided by the negative voltage adjustment device.

Abstract: An apparatus includes a capacitor coupled to a power switch, wherein the capacitor is configured to provide a negative gate voltage to the power switch when a turn-off signal is applied to a gate of the power switch, and a sink and source power supply coupled to the capacitor, wherein the sink and source power supply has a first current limit for controlling a sink current flowing from the capacitor to the sink and source power supply, and a second current limit for controlling a source current flowing from the sink and source power supply to the capacitor.

Abstract: The invention relates to the field of power semiconductor devices. This invention discloses a drive circuit and device of a power switch. The input terminal of the drive circuit receives a pulse signal; the output terminal of the drive circuit is connected to a capacitor circuit. The capacitor circuit is used to provide a negative voltage for a first electrode of the power switch to turn off the power switch when the pulse signal is a turn-off signal; the drive circuit includes a capacitance adjustment unit. The capacitance adjustment unit includes a negative voltage adjustment element that can charge a capacitor whose voltage is lower than a predetermined voltage when the pulse signal is the turn-off signal.