CONTROL APPARATUS OF POWER CONVERTER CIRCUIT

• US 20100277956A1
• Filed: 10/31/2008
• Published: 11/04/2010
• Est. Priority Date: 11/06/2007
• Status: Active Grant

• Current Assignee: Nagasaki University
• Original Assignee: Nagasaki University
• Inventors: Kurokawa, Fujio
• Granted Patent: US 8,451,631 B2
• Time in Patent Office: Days
• US Class Current: 363/21.04
• CPC Class Codes: H02M 3/33507 with automatic control of the output voltage or current, e.g. flyback converters H02M3/33561, H02M3/33569 take precedence

Abstract

To detect a peak time of an exciting current of a transformer, a primary current corresponding to the peak time, or a variation time of the primary voltage, and to switch a switch after expiration of a predetermined period from the peak time, after the peak time occurs. A control apparatus 1 is applied to a power conversion circuit 2 which includes a switch circuit 23 including one switch or a plurality of switches and a transformer 21. The control apparatus includes: an output voltage detector 11 detecting a value of an output voltage of the power conversion circuit; an exciting current peak time generator 12 detecting a peak time of an exciting current of the transformer; a timing generator 13 generating a switching timing of the one switch or the plurality of switches. The timing generator 13 generates the switching timing of the one switch or the plurality of switches on the basis of the output voltage and the peak time.

Claims

1. A control apparatus applied to a power conversion circuit which includes a transformer and a switch circuit including one switch or a plurality of switches, the control apparatus comprising:

an output voltage detector detecting a value of an output voltage of the power conversion circuit;

an exciting current peak time generator detecting a peak time of an exciting current of the transformer; and

a timing generator generating a switching timing of the one switch or the plurality of switches,

wherein the timing generator generates the switching timing of the one switch or the plurality of switches on the basis of the output voltage and the peak time.

2. The control apparatus according to claim 1, wherein the power conversion circuit is of a current resonance type.

3. The control apparatus according to claim 1, wherein the timing generator counts a time corresponding to a deviation between the output voltage and a reference voltage from the peak time to generate the switching timing.

4. The control apparatus according to claim 1, wherein the exciting current peak time generator detects the peak time on the basis of a variation in a primary current or the primary voltage of the transformer.

5. The control apparatus according to claim 1, wherein the switch circuit includes one switch or a plurality of switches forming a bridge arm.

6. The control apparatus according claim 1, wherein all of the output voltage detector, the exciting current peak value detector, and the timing generator are configured by an analog circuit or a digital circuit, or some thereof are configured by an analog circuit and the other thereof are configured by a digital circuit.

7. The control apparatus according to claim 2, wherein the timing generator counts a time corresponding to a deviation between the output voltage and a reference voltage from the peak time to generate the switching timing.

8. The control apparatus according to claim 2, wherein the exciting current peak time generator detects the peak time on the basis of a variation in a primary current or the primary voltage of the transformer.

9. The control apparatus according to claim 3, wherein the exciting current peak time generator detects the peak time on the basis of a variation in a primary current or the primary voltage of the transformer.

10. The control apparatus according to claim 2, wherein the switch circuit includes one switch or a plurality of switches forming a bridge arm.

11. The control apparatus according to claim 3, wherein the switch circuit includes one switch or a plurality of switches forming a bridge arm.

12. The control apparatus according to claim 4, wherein the switch circuit includes one switch or a plurality of switches forming a bridge arm.

13. The control apparatus according to claim 2, wherein all of the output voltage detector, the exciting current peak value detector, and the timing generator are configured by an analog circuit or a digital circuit, or some thereof are configured by an analog circuit and the other thereof are configured by a digital circuit.

14. The control apparatus according to claim 3, wherein all of the output voltage detector, the exciting current peak value detector, and the timing generator are configured by an analog circuit or a digital circuit, or some thereof are configured by an analog circuit and the other thereof are configured by a digital circuit.

15. The control apparatus according to claim 4, wherein all of the output voltage detector, the exciting current peak value detector, and the timing generator are configured by an analog circuit or a digital circuit, or some thereof are configured by an analog circuit and the other thereof are configured by a digital circuit.

16. The control apparatus according to claim 5, wherein all of the output voltage detector, the exciting current peak value detector, and the timing generator are configured by an analog circuit or a digital circuit, or some thereof are configured by an analog circuit and the other thereof are configured by a digital circuit.