Power supply apparatus with auxiliary boost circuit

A power supply apparatus applied to an alternating current power supply apparatus and a load apparatus, the power supply apparatus comprising:

• a rectification circuit electrically connected to the alternating current power supply apparatus;
• a power factor correction circuit electrically connected to the rectification circuit;
• an auxiliary boost circuit electrically connected to the power factor correction circuit;
• and
• a direct current to direct current conversion circuit electrically connected to the auxiliary boost circuit and the load apparatus,
• wherein the auxiliary boost circuit comprises:
• an input contact electrically connected to the power factor correction circuit;
• an output contact electrically connected to the direct current to direct current conversion circuit;
• a voltage detection unit electrically connected to the input contact;
• a control unit electrically connected to the voltage detection unit and the power factor correction circuit;
• a boost unit electrically connected to the input contact, the output contact and the control unit;
• and
• a boost bypass unit electrically connected to the input contact, the output contact, the control unit and the direct current to direct current conversion circuit,
• wherein the alternating current power supply apparatus sends an alternating current power to the rectification circuit;
• the rectification circuit rectifies the alternating current power to obtain a direct current power;
• the rectification circuit sends the direct current power to the power factor correction circuit;
• the power factor correction circuit processes the direct current power to obtain a power factor correction power;
• the power factor correction circuit sends the power factor correction power to the input contact;
• wherein the voltage detection unit detects the power factor correction power and then informs the control unit the power factor correction power;
• wherein when a voltage value of the power factor correction power is greater than a predetermined voltage value, the control unit is configured to turn on the boost bypass unit and turn off the boost unit, so that the power factor correction power is sent to the direct current to direct current conversion circuit through the boost bypass unit and the output contact;
• wherein when the voltage value of the power factor correction power is not greater than the predetermined voltage value, the control unit is configured to turn off the boost bypass unit and turn on the boost unit, so that the boost unit boosts the power factor correction power and then the power factor correction power is sent to the direct current to direct current conversion circuit through the boost unit and the output contact.