Power supply device including voltage boosting circuit

A power supply device, comprising:

• an electrical power interface configured to receive electrical power from a power source;
• a power factor correction circuit electrically connected to the electrical power interface and configured to increase a voltage of the electrical power from an input voltage to a first converter voltage and increase a power factor of the power supply device;
• an LLC resonant converter including a positive input node and a negative input node electrically connected to the power factor correction circuit and configured to regulate an output voltage based at least on a delivered converter voltage and a system load;
• a voltage boosting circuit electrically intermediate the electrical power interface and the LLC resonant converter, wherein the voltage boosting circuit is configured to increase an input voltage of the electrical power to a second converter voltage, and wherein the voltage boosting circuit includes a first capacitor and a second capacitor electrically connected in series between the positive input node and the negative input node of the LLC resonant converter, and a switch electrically connected to an intermediate node between the first capacitor and the second capacitor;
• and
• a detector configured to:
• responsive to one or more of the input voltage being greater than a threshold voltage and the system load being greater than a threshold load, turn the power factor correction circuit on and the switch off to deliver the first converter voltage from the power factor correction circuit to the LLC resonant converter supplemented by charge accumulated at the first capacitor and the second capacitor as the delivered converter voltage, and
• responsive to one or more of the input voltage being less than the threshold voltage and the system load being less than the threshold load, turn the power factor correction circuit off and the switch on to deliver the second converter voltage as the delivered converter voltage from the voltage boosting circuit to the LLC resonant converter via charge accumulated at the first capacitor and the second capacitor.

A power supply device, comprising:

• an electrical power interface configured to receive alternating current (AC) electrical power from an AC power source;
• an electromagnetic interference filter electrically connected to the electrical power interface and configured to filter out electromagnetic noise in the AC electrical power received by the electrical power interface to output filtered AC electrical power;
• a bridge rectifier electrically connected to the electromagnetic interference filter and configured to rectify the filtered AC electrical power to output rectified electrical power;
• a power factor correction circuit electrically connected to the bridge rectifier and configured to increase a voltage of the rectified electrical power from an input voltage to a first converter voltage and increase a power factor of the power supply device;
• an LLC resonant converter including a positive input node and a negative input node electrically connected to the power factor correction circuit and configured to regulate an output voltage based at least on a delivered converter voltage and a system load;
• a voltage boosting circuit electrically intermediate the electrical power interface and the LLC resonant converter, wherein the voltage boosting circuit is configured to increase the voltage of the rectified electrical power to a second converter voltage, and wherein the voltage boosting circuit includes a first capacitor and a second capacitor electrically connected in series between the positive input node and the negative input node of the LLC resonant converter, and a switch electrically connected to an intermediate node between the first capacitor and the second capacitor;
• and
• a detector configured to:
• responsive to a first operating condition of the power supply device, turn the power factor correction circuit on and the switch off to deliver the first converter voltage from the power factor correction circuit to the LLC resonant converter supplemented by charge accumulated at the first capacitor and the second capacitor as the delivered converter voltage, and
• responsive to a second operating condition of the power supply device, turn the power factor correction circuit off and the switch on to deliver the second converter voltage as the delivered converter voltage from the voltage boosting circuit to the LLC resonant converter via charge accumulated at the first capacitor and the second capacitor.