Power delivery device and control method thereof

Patent metadata

Field	Value
Publication number	US-10044275-B2
Application number	US-201615373485-A
Country	US
Kind code	B2
Filing date	Dec 9, 2016
Priority date	Jun 21, 2016
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A power delivery device and a control method are shown. The power delivery device includes a power conversion circuit, a power factor correction circuit, and an output voltage control circuit. The power conversion circuit includes a primary side and a secondary side, and is configured to receive an input voltage and convert the input voltage to an output voltage. The power factor correction circuit is electrically coupled to the primary side and configured to increase the power factor of the power delivery device. The output voltage control circuit is electrically coupled to the secondary side and configured to control the voltage level of the output voltage. When the voltage level of the output voltage is lower than a predetermined level, the power factor correction circuit is deactivated.

First claim

What is claimed is:

1. A power delivery device, comprising:
a power conversion circuit comprising a primary side and a secondary side, wherein the power conversion circuit is configured to receive an input voltage and convert the input voltage to an output voltage;
a power factor correction circuit, electrically coupled to the primary side and configured to increase a power factor of the power delivery device; and
an output voltage control circuit, electrically coupled to the secondary side and configured to control a voltage level of the output voltage, and detect an output current of the power delivery device;
wherein when the voltage level of the output voltage is lower than a predetermined level and the output current is larger than a predetermined current value, the power factor correction circuit is deactivated,
when the output current is smaller than the predetermined current value, an operation of the power factor correction circuit is uninterrupted by the output voltage control circuit.

2. The power delivery device of claim 1 , wherein the output voltage control circuit is further configured to output a corresponding control signal according to the voltage level of the output voltage, to selectively turn on or turn off the power factor correction circuit.

3. The power delivery device of claim 2 , further comprising a driving circuit, and the driving circuit is electrically coupled to the power factor correction circuit and configured to receive the control signal and output a driving signal to the power factor correction circuit correspondingly, and the power factor correction circuit is turned on or turned off according to the driving signal.

4. The power delivery device of claim 3 , further comprising:
an isolating circuit, electrically coupled between the output voltage control circuit and the driving circuit;
wherein the output voltage control circuit is configured to output the control signal to the driving circuit via the isolating circuit.

5. The power delivery device of claim 3 , wherein the driving circuit comprises:
a switching unit, wherein a first terminal of the switching unit is configured to receive a disable level, a second terminal of the switching unit is configured to output the driving signal to the power factor correction circuit, and a control terminal of the switching unit is configured to receive the control signal such that the switching unit is turned on or off according to the control signal selectively.

6. The power delivery device of claim 1 , wherein when the output current is larger than the predetermined current value, the output voltage control circuit outputs a corresponding control signal according to the voltage level of the output voltage, to turn on or turn off the power factor correction circuit selectively.

7. The power delivery device of claim 6 , wherein the output voltage control circuit is further configured to detect the output current in a detecting period, and stop detecting the output current in a sleeping period.

8. A power delivery device, comprising:
an output voltage control circuit, configured to control an output voltage of the power delivery device, to selectively switch the output voltage at one of a plurality of voltage levels, and configured to detect an output current of the power delivery device; and
a power factor correction circuit, configured to increase a power factor of the power delivery device;
wherein when a voltage level of the output voltage is smaller than a predetermined level and the output current is larger than a predetermined current value, the output voltage control circuit outputs a first disable signal to turn off the power factor correction circuit;
when the output current is smaller than the predetermined current value, an operation of the power factor correction circuit is uninterrupted by the output voltage control circuit.

9. The power delivery device of claim 8 , further comprising:
an isolating circuit, electrically coupled to the output voltage control circuit; and
a driving circuit, electrically coupled to the power factor correction circuit and the isolating circuit, and the driving circuit is configured to receive the first disable signal from the output voltage control circuit via the isolating circuit, and output a second disable signal correspondingly to the power factor correction circuit to turn off the power factor correction circuit.

10. The power delivery device of claim 9 , wherein the isolating circuit comprises an optical coupler, and a first input terminal of the optical coupler is configured to receive the first disable signal, and an output terminal of the optical coupler is electrically coupled to the driving circuit.

11. The power delivery device of claim 10 , wherein the isolating circuit further comprises a first resistor, and a first terminal of the first resistor is configured to receive the output voltage, and a second terminal of the first resistor is electrically coupled to a second input terminal of the optical coupler.

12. The power delivery device of claim 9 , wherein the driving circuit comprises a switching unit, and a first terminal of the switching unit is configured to receive a disable level, a second terminal of the switching unit is electrically coupled to the power factor correction circuit, and a control terminal of the switching unit is electrically coupled to the isolating circuit.

13. The power delivery device of claim 12 , wherein when the control terminal of the switching unit receives the first disable signal, the switching unit is turned on correspondingly such that the second terminal of the switching unit outputs the second disable signal to the power factor correction circuit.

14. The power delivery device of claim 12 , wherein the driving circuit further comprises a second resistor and a third resistor, and the second terminal of the switching unit is electrically coupled to the power factor correction circuit via the second resistor, and the control terminal of the switching unit is electrically coupled to the isolating circuit via the third resistor.

15. The power delivery device of claim 8 , wherein when the output current is larger than the predetermined current value, the output voltage control circuit outputs the first disable signal correspondingly according to the voltage level of the output voltage to turn off the power factor correction circuit.

16. The power delivery device of claim 15 , wherein the output voltage control circuit is configured to detect the output current in a detecting period, and stop detecting the output current in a sleeping period.

17. A control method, comprising:
controlling, by an output voltage control circuit, an output voltage of a power delivery device selectively at one of a plurality of voltage levels;
detecting, by the output voltage control circuit, an output current of the power delivery device;
increasing, by a power factor correction circuit, a power factor of the power delivery device;
turning off the power factor correction circuit when a voltage level is controlled to be smaller than a predetermined level by the output voltage control circuit and the output current is larger than a predetermined current value; and
remaining an operation of the power factor correction circuit being uninterrupted when the output current is smaller than the predetermined current value.

18. The control method of claim 17 , wherein the power delivery device further comprises an isolating circuit and a driving circuit, and turning off the power factor correction circuit com

Assignees

• Delta Electronics Inc

Inventors

• Lin Kun-Chi
• Cheng Chung-Chieh
• Kuo Kun-Jang
• Chen Tien-He
• Lin Shou-Chieh

Classifications

• H02M3/33523

  with galvanic isolation between input and output of both the power stage and the feedback loop · CPC title

• H02M1/4208 Primary

  Arrangements for improving power factor of AC input · CPC title

• H02M3/33507 Primary

  with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence) · CPC title

• H02M1/42

  Circuits or arrangements for compensating for or adjusting power factor in converters or inverters · CPC title

• H02M2001/0009

  Electricity · mapped topic