Power supply unit with re-rush current limiting

A power supply unit comprising:

• a rectifying module to rectify an alternating current (AC) voltage;
• a first bulk capacitor to receive the rectified AC voltage from the rectifying module;
• a first transistor coupled in series with the first bulk capacitor;
• an AC input monitoring circuit coupled to the first transistor, the AC input monitoring circuit to hold the first transistor in an OFF state when the AC voltage is in a dropout state;
• a current source coupled to the first transistor, the current source to adopt an adaptive gate voltage to control the first transistor in response to a detection of the AC voltage being re-applied, wherein the adaptive gate voltage includes diversion of a gate current when the first transistor reaches a plateau region to limit a re-rush current;
• and
• a virtual miller capacitance circuit coupled to the first transistor, the virtual miller capacitance circuit to set the re-rush current through the first transistor at a constant value.

A power supply unit comprising:

• a first bulk capacitor to receive a rectified alternating current (AC) voltage from a rectifying module;
• a first transistor coupled in series with the first bulk capacitor;
• an AC input monitoring circuit coupled to the first transistor, the AC input monitoring circuit to hold the first transistor in an OFF state in response to a detection of an AC voltage dropout;
• a current source coupled to the first transistor, the current source to adopt an adaptive gate voltage to control the first transistor in response to a detection of the AC voltage being re-applied, and to turn on the first transistor based on the adaptive gate voltage to limit a re-rush current within the power supply unit after the AC voltage is re-applied;
• and
• a virtual miller capacitance circuit coupled to the first transistor, the virtual miller capacitance circuit to set the re-rush current through the first transistor at a constant value.