POWER SUPPLY APPARATUS WITH AUXILIARY BOOST CIRCUIT

• US 20160079880A1
• Filed: 09/15/2014
• Published: 03/17/2016
• Est. Priority Date: 09/15/2014
• Status: Active Grant

• Current Assignee: Chicony Power Technology Co. Ltd. (Chicony Electronics Company Limited)
• Original Assignee: Chicony Power Technology Co. Ltd. (Chicony Electronics Company Limited)
• Inventors: Wang, Tzu-Hung, Chang, Che-Hao, LU, Zhi-Hong, WU, Chiuan-Shing, YANG, Meng-Chi
• Granted Patent: US 9,397,556 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02M 1/4225 using a non-isolated boost converter
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators
• 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
• CPC Class Codes: Y02P 80/10 Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Abstract

A power supply apparatus includes a rectification circuit, a power factor correction circuit, an auxiliary boost circuit and a direct current to direct current conversion circuit. The auxiliary boost circuit includes an input contact, an output contact, a voltage detection unit, a control unit, a boost unit and a boost bypass unit. When a voltage value of a power factor correction power is not greater than a 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.

Claims

1. 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.

2. The power supply apparatus in claim 1, further comprising:

a feedback unit electrically connected to the control unit and the output contact.

3. The power supply apparatus in claim 2, wherein the boost bypass unit comprises:

a first resistor electrically connected to the control unit;

a first transistor electrically connected to the first resistor;

an optical coupler electrically connected to the first transistor, the direct current to direct current conversion circuit and the input contact; and

a second resistor electrically connected to the optical coupler and the direct current to direct current conversion circuit.

4. The power supply apparatus in claim 3, wherein the boost bypass unit further comprises:

a zener diode electrically connected to the direct current to direct current conversion circuit and the input contact; and

a third resistor electrically connected to the direct current to direct current conversion circuit and the input contact.

5. The power supply apparatus in claim 4, wherein the boost bypass unit further comprises:

a second transistor electrically connected to the direct current to direct current conversion circuit, the input contact and the output contact;

a third transistor electrically connected to the direct current to direct current conversion circuit, the input contact and the output contact; and

a first capacitor electrically connected to the output contact.

6. The power supply apparatus in claim 5, wherein the boost unit comprises:

a fourth transistor electrically connected to the control unit;

a first inductor electrically connected to the fourth transistor and the input contact; and

a first diode electrically connected to the fourth transistor, the first inductor and the output contact.

7. The power supply apparatus in claim 6, wherein the boost unit further comprises:

a fourth resistor electrically connected to the fourth transistor and the control unit; and

a fifth resistor electrically connected to the fourth transistor and the fourth resistor.

8. The power supply apparatus in claim 7, wherein the feedback unit comprises:

a sixth resistor electrically connected to the output contact.

9. The power supply apparatus in claim 8, wherein the feedback unit further comprises:

a seventh resistor electrically connected to the sixth resistor; and

an eighth resistor electrically connected to the seventh resistor and the control unit.

10. The power supply apparatus in claim 9, wherein the voltage detection unit comprises:

a ninth resistor electrically connected to the input contact;

a tenth resistor electrically connected to the ninth resistor; and

an eleventh resistor electrically connected to the tenth resistor and the control unit.