Extending hold-up time of a power supply unit

A power supply unit (PSU), comprising:

• a primary side, including:
• a buck capacitor;
• a primary digital signal processor (DSP) in electrical communication with the buck capacitor, the primary DSP determining a first state of charge (SOC) of the buck capacitor;
• a power form controller (PFC) in electrical communication with the buck capacitor;
• a secondary side, including:
• a super capacitor;
• a secondary digital signal processor (DSP) in electrical communication with the super capacitor, the secondary DSP determining the second state of charge (SOC) of the super capacitor;
• a switch in electrical communication with the secondary DSP and the super capacitor;
• a converter in electrical communication with an output of the primary side and in electrical communication with the super capacitor,
• wherein in a first state, the PFC receives energy from a source of energy, and in response:
• provides the energy to i) charge the buck capacitor based on the first SOC of the buck capacitor, ii) charge the super capacitor based on the second SOC of the super capacitor;
• and iii) an information handling system coupled to the PSU, and
• wherein in a second state, the PFC ceases to receive energy from the source of energy and in response:
• the buck capacitor discharges to provide energy to the information handling system;
• and
• after the buck capacitor is completely discharged, the super capacitor discharges to provide energy to the information handling system.

A method for extending hold-up time of a power supply unit (PSU), comprising:

• determining, at a first time, that the PSU is receiving energy from a source of energy, and in response:
• providing energy to i) charge a buck capacitor of a primary side of the PSU based on a first state of charge (SOC) of the buck capacitor, ii) charge a super capacitor of a secondary side of the PSU based on a second state of charge (SOC) of the super capacitor, and iii) an information handling system coupled to the PSU;
• and
• determining, at a second time, that the PSU ceases to receive the energy from the source of energy, and in response:
• discharging the buck capacitor to provide energy to the information handling system;
• and
• after the buck capacitor is completely discharged, discharging the super capacitor to provide energy to the information handling system.