POWER SUPPLY APPARATUS

• US 20150092463A1
• Filed: 10/01/2014
• Published: 04/02/2015
• Est. Priority Date: 10/01/2013
• Status: Active Grant

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group), Solum Co., Ltd.
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: JEONG, Yeon Ho, LEE, Jeong Nam
• Granted Patent: US 9,263,953 B2
• Time in Patent Office: Days
• US Class Current: 363/89
• CPC Class Codes: H02M 1/0006 Arrangements for supplying an adequate voltage to the control circuit of converters
• CPC Class Codes: H02M 1/007 Plural converter units in cascade push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826
• CPC Class Codes: H02M 1/4225 using a non-isolated boost converter
• CPC Class Codes: H02M 3/335 using semiconductor devices only
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

Embodiments of the invention provide a power supply apparatus, including an AC/DC rectifying unit converting an AC voltage into a DC voltage, a power factor correction unit correcting a power factor of the DC voltage, and a DC/DC conversion unit converting the DC voltage having the corrected power factor into a DC voltage having a different magnitude therefrom. According to various embodiments, the power supply apparatus further includes an auxiliary winding connected to a primary side winding of a transformer of the DC/DC conversion unit and generating the DC voltage having a predetermined magnitude, and an internal power generation unit connected to an output terminal of the power factor correction unit and the auxiliary winding and using a voltage of the output terminal of the power factor correction unit and a voltage generated by the auxiliary winding to generate temporary Vcc power and supply the generated temporary Vcc power as internal power of the power factor correction unit.

Claims

1. A power supply apparatus, comprising:

an AC/DC rectifying unit converting an AC voltage into a DC voltage;

a power factor correction unit correcting a power factor of the DC voltage converted by the AC/DC rectifying unit;

a DC/DC conversion unit converting the DC voltage having the power factor corrected by the power factor correction unit into a DC voltage having a different magnitude therefrom;

an auxiliary winding connected to a primary side winding of a transformer of the DC/DC conversion unit and generating a DC voltage having a predetermined magnitude; and

an internal power generation unit connected to an output terminal of the power factor correction unit and the auxiliary winding and using a voltage of the output terminal of the power factor correction unit and a voltage generated by the auxiliary winding to generate temporary Vcc power and supply the generated temporary Vcc power as internal power of the power factor correction unit.

2. The power supply apparatus according to claim 1, wherein the internal power generation unit comprises:

a Vcc power circuit unit generating the temporary Yee power by dividing an output voltage of the power factor correction unit using a plurality of resistors;

a Vcc_DC/DC connection unit connecting the voltage generated by the auxiliary winding to the temporary Vcc power; and

a Vcc voltage change unit changing a magnitude of the voltage generated by the Vcc power circuit unit.

3. The power supply apparatus according to claim 2, wherein the Vcc power circuit unit is configured as a serial connection circuit of a first resistor and a second resistor which divide the output voltage of the power factor correction unit to generate the temporary Vcc power.

4. The power supply apparatus according to claim 3, wherein resistance values of the first resistor and the second resistor are set based on minimum input power of the power supply apparatus and a voltage value of the internal power to be set.

5. The power supply apparatus according to claim 3, wherein the Vcc_DC/DC connection unit is configured to include a diode of which a cathode is connected to a common connection node of the first resistor and the second resistor of the Vcc power circuit unit.

6. The power supply apparatus according to claim 3, wherein the Vcc voltage change unit is configured to include a third resistor having one terminal connected to a common connection node of the first resistor and the second resistor of the Vcc power circuit unit and a switch device having a drain connected to the other terminal of the third resistor, a source connected to a ground, and a gate applied with the voltage generated by the auxiliary winding.

7. The power supply apparatus according to claim 6, wherein the switch device is an NMOS.

8. The power supply apparatus according to claim 3, wherein the Vcc voltage change unit is configured to include a third resistor having one terminal connected to a common connection node of the first resistor and the second resistor of the Vcc power circuit unit, a switch device having a drain connected to the other terminal of the third resistor and a source connected to a ground, and an operating amplifier having an output terminal connected to a gate of the switch device and amplifying and outputting the output voltage of the power factor correction unit input through an input terminal when the output voltage is larger than a preset voltage.

9. The power supply apparatus according to claim 8, wherein the switch device is an NMOS.