Feedback voltage stabilizing apparatus, method, and power conversion system

• US 8,278,891 B2
• Filed: 04/01/2010
• Issued: 10/02/2012
• Est. Priority Date: 04/01/2010
• Status: Active Grant

• Current Assignee: Lien Chang Electronic Enterprise Co Ltd
• Original Assignee: Lien Chang Electronic Enterprise Co Ltd
• Inventors: Chan, Chun-Kong, Yu, Po-Yuan
• Primary Examiner(s): Laxton, Gary L
• Application Number:
  US12/752,764
• Publication Number:
  US 20110241638A1
• Time in Patent Office: 915 Days
• Field of Search: 363/39, 363/50, 323/265, 323/268, 323/271, 323/299, 323/349, 323/350, 323/351, 361/18, 361/86, 307/113, 307/130, 307/132.M, 307/141.8
• US Class Current: 323/271
• CPC Class Codes: H02M 1/14 Arrangements for reducing ripples from dc input or output
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters

Abstract

Feedback voltage stabilizing apparatus, method, and power conversion system are disclosed. The apparatus includes a first switching unit, a second switching unit, and a conduction control unit. In which, the first switching unit is coupled to a feedback circuit for controlling whether a feedback signal is transmitted from a first end to a second end. The second switching unit is for avoiding voltage vibrations which caused by the feedback signal occurring at the second end. By capturing a detection signal, the conduction control unit can determine whether to simultaneously turn on the first switching unit and the second switching unit, in order to eliminate the voltage vibrations, or not.

Claims

1. A feedback voltage stabilizing apparatus associating with a feedback circuit which has a first end and a second end, comprising:

a first switching unit coupled to the feedback circuit, for controlling whether a feedback signal is transmitted from the first end to the second end;

a second switching unit coupled to the feedback circuit; and

a conduction control unit coupled to the feedback circuit, the first switching unit, and the second switching unit, for capturing a detection signal from the feedback circuit, and for simultaneously turning on the first switching unit and the second switching unit according to the detection unit, in order to avoid a voltage vibration occurring at the second end.

2. The feedback voltage stabilizing apparatus as in claim 1, wherein the first switching unit has a first resistor, and the second switching unit has a second resistor, in which the first resistor and second resistor are for dividing a voltage of the feedback signal according to a feedback ratio.

3. The feedback voltage stabilizing apparatus as in claim 1, wherein the detection signal is a feedback voltage at the first end of the feedback circuit.

4. The feedback voltage stabilizing apparatus as in claim 3, wherein the conduction control unit determines whether the feedback voltage is larger than a reference value or not, if the feedback voltage is larger than the reference value, the conduction control unit then simultaneously turns on the first switching unit and the second switching unit.

5. The feedback voltage stabilizing apparatus as in claim 1, wherein the conduction control unit includes a zener diode.

6. A power conversion system, comprising:

a power conversion unit having a feedback circuit, which includes a first end and a second end;

a feedback voltage stabilizing apparatus coupled to the power conversion unit, for avoiding a voltage vibration occurring at the second end, in which the feedback voltage stabilizing apparatus includes;

a first switching unit coupled to the feedback circuit, for controlling whether a feedback signal is transmitted from the first end to the second end;

a second switching unit coupled to the feedback circuit; and

a conduction control unit coupled to the feedback circuit, the first switching unit, and the second switching unit, for capturing a detection signal from the feedback circuit, and for simultaneously turning on the first switching unit and the second switching unit according to the detection unit.

7. The power conversion system as in claim 6, wherein the first switching unit has a first resistor, and the second switching unit has a second resistor, in which the first resistor and second resistor are for dividing a voltage of the feedback signal according to a feedback ratio.

8. The power conversion system as in claim 6, wherein the detection signal is a feedback voltage at the first end of the feedback circuit.

9. The power conversion system as in claim 8, wherein the conduction control unit determines whether the feedback voltage is larger than a reference value or not, if the feedback voltage is larger than the reference value, the conduction control unit then simultaneously turns on the first switching unit and the second switching unit.

10. The power conversion system as in claim 6, wherein the conduction control unit includes a zener diode.

11. A feedback voltage stabilizing method associating with a feedback circuit which is for transmitting a feedback signal from a first end to a second end, comprising:

providing a first switching unit and a second switching unit to the feedback circuit;

capturing a detection signal from the feedback circuit; and

controlling the first switching unit and the second switching unit according to the detection signal, in order to avoid a voltage vibration occurring at the second end.

12. The feedback voltage stabilizing method as in claim 11, wherein the detection signal is a feedback voltage at the first end of the feedback circuit.

13. The feedback voltage stabilizing method as in claim 12, wherein the step of controlling the first switching unit and the second switching unit according to the detection signal includes determining whether the feedback voltage is larger than a reference value, if the feedback voltage is larger than the reference value, then simultaneously turning on the first switching unit and the second switching unit.