QUASI-RESONANT SYSTEMS AND METHODS WITH MULTI-MODE CONTROL

• US 20100219802A1
• Filed: 03/23/2009
• Published: 09/02/2010
• Est. Priority Date: 03/02/2009
• Status: Active Grant

• Current Assignee: On-Bright Electronics (Shanghai) Co., Ltd. (Orthosie Investment Holdings Ltd.)
• Original Assignee: On-Bright Electronics (Shanghai) Co., Ltd. (Orthosie Investment Holdings Ltd.)
• Inventors: Ye, Jun, Lin, Yuan, Fang, Lieyi
• Granted Patent: US 8,085,027 B2
• Time in Patent Office: Days
• US Class Current: 323/284
• CPC Class Codes: H02M 1/0022 the disturbance parameters being input voltage fluctuations
• 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
• 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

Switch-mode power conversion system and method thereof. The switch-mode power conversion system includes a primary winding configured to receive an input voltage, and a secondary winding coupled to the primary winding and configured to, with one or more other components, generate an output signal. Additionally, the switch-mode power conversion system includes a feedback component configured to receive the output signal and generate a feedback signal based on at least information associated with the output signal, and a voltage detector configured to receive the input voltage and output a detection signal. Moreover, the switch-mode power conversion system includes a mode controller configured to receive the detection signal and the feedback signal and generate a switch signal based on at least information associated with the detection signal and the feedback signal, and a switch configured to receive the switch signal and affect a first current flowing through the primary winding.

Claims

1. A switch-mode power conversion system, the system comprising:

a primary winding configured to receive an input voltage;

a secondary winding coupled to the primary winding and configured to, with one or more other components, generate an output signal;

a feedback component configured to receive the output signal and generate a feedback signal based on at least information associated with the output signal;

a voltage detector configured to receive the input voltage and output a detection signal;

a mode controller configured to receive the detection signal and the feedback signal and generate a switch signal based on at least information associated with the detection signal and the feedback signal;

a switch configured to receive the switch signal and affect a first current flowing through the primary winding;

wherein the mode controller is further configured to;

process information associated with the detection signal and a first threshold;

determine whether the detection signal and the first threshold satisfy a first predetermined criterion;

process information associated with the feedback signal and a second threshold;

determine whether the feedback signal and the second threshold satisfy a second predetermined criterion;

determine whether an operation mode for the switch-mode power conversion system is a quasi-resonant mode based on at least whether the first predetermined criterion is determined to be satisfied and whether the second predetermined criterion is determined to be satisfied;

wherein the switch signal corresponds to the operation mode for the switch-mode power conversion system.

2. The switch-mode power conversion system of claim 1 wherein the first predetermined criterion is that the detection signal is larger than the first threshold in magnitude.

3. The switch-mode power conversion system of claim 1 wherein the second predetermined criterion is that the feedback signal is larger than the second threshold in magnitude.

4. The switch-mode power conversion system of claim 1 wherein the mode controller is further configured to determine whether the operation mode is a fixed frequency mode based on at least whether the first predetermined criterion is determined to be satisfied and whether the second predetermined criterion is determined to be satisfied.

5. The switch-mode power conversion system of claim 4 wherein the fixed frequency mode is a continuous current mode.

6. The switch-mode power conversion system of claim 4 wherein the first predetermined criterion is that the detection signal is larger than the first threshold in magnitude.

7. The switch-mode power conversion system of claim 6 wherein the second predetermined criterion is that the feedback signal is larger than the second threshold in magnitude.

8. The switch-mode power conversion system of claim 4 wherein the mode controller is further configured to:

process information associated with the feedback signal, the second threshold, and a third threshold;

determine whether the feedback signal, the second threshold, and the third threshold satisfy a third predetermined criterion;

determine whether the operation mode is a quasi-resonant foldback mode based on at least whether the third predetermined criterion is determined to be satisfied, the quasi-resonant foldback mode being different from the quasi-resonant mode.

9. The switch-mode power conversion system of claim 8 wherein the third predetermined criterion is that the feedback signal is smaller than the second threshold and larger than the third threshold in magnitude.

10. The switch-mode power conversion system of claim 8 wherein the mode controller is further configured to:

determine whether the feedback signal and the third threshold satisfy a fourth predetermined criterion;

determine whether the operation mode is a burst mode based on at least whether the fourth predetermined criterion is determined to be satisfied.

11. The switch-mode power conversion system of claim 10 wherein the fourth predetermined criterion is that the feedback signal is smaller than the third threshold in magnitude.

12. The switch-mode power conversion system of claim 1 wherein the switch-mode power conversion system is a pulse-width-modulated power conversion system.

13. The switch-mode power conversion system of claim 1 wherein:

the voltage detector includes a first resistor and a second resistor, the first resistor and the second resistor being connected to each other in series;

the detection signal is a voltage signal.

14. The switch-mode power conversion system of claim 1 wherein:

the voltage detector includes at least one resistor, the resistor being connected to a diode voltage clamp;

the detection signal is a current signal.

15. The switch-mode power conversion system of claim 1 wherein the input voltage is a rectified line input voltage.

16. The switch-mode power conversion system of claim 1 wherein the output signal is an output voltage.

17. The switch-mode power conversion system of claim 1 wherein the one or more other components include at least one selected from a group consisting of a diode and a capacitor.

18. A switch-mode power conversion system, the system comprising:

a primary winding configured to receive an input voltage;

a secondary winding coupled to the primary winding and configured to, with one or more other components, generate an output signal;

a feedback component configured to receive the output signal and generate a feedback signal based on at least information associated with the output signal;

a voltage detector configured to receive the input voltage and output a detection signal;

a first mode controller configured to receive the detection signal and the feedback signal and generate a switch signal based on at least information associated with the detection signal and the feedback signal;

a switch configured to receive the switch signal and affect a first current flowing through the primary winding;

wherein;

the first mode controller includes at least a mode selection component and a quasi-resonant mode controller;

the mode selection component is configured to;

process information associated with the detection signal and a first threshold;

determine whether the detection signal and the first threshold satisfy a first predetermined criterion;

process information associated with the feedback signal and a second threshold;

determine whether the feedback signal and the second threshold satisfy a second predetermined criterion;

determine whether an operation mode for the switch-mode power conversion system is a quasi-resonant mode based on at least whether the first predetermined criterion is determined to be satisfied and whether the second predetermined criterion is determined to be satisfied;

if the operation mode is determined to be the quasi-resonant mode, send a mode selection signal to the quasi-resonant mode controller to generate the switch signal corresponding to the quasi-resonant mode.

19. The switch-mode power conversion system of claim 18 wherein the first predetermined criterion is that the detection signal is larger than the first threshold in magnitude.

20. The switch-mode power conversion system of claim 19 wherein the second predetermined criterion is that the feedback signal is larger than the second threshold in magnitude.

21. The switch-mode power conversion system of claim 18 wherein:

the first mode controller further includes at least a fixed frequency mode controller;

the mode selection component is further configured to;

determine whether the operation mode is a fixed frequency mode based on at least whether the first predetermined criterion is determined to be satisfied and whether the second predetermined criterion is determined to be satisfied;

if the operation mode is determined to be the fixed frequency mode, send the mode selection signal to the fixed frequency mode controller to generate the switch signal corresponding to the fixed frequency mode.

22. The switch-mode power conversion system of claim 21 wherein the fixed frequency mode is a continuous current mode.

23. The switch-mode power conversion system of claim 21 wherein:

the first mode controller further includes at least a quasi-resonant foldback mode controller;

the first mode controller is further configured to;

process information associated with the feedback signal, the second threshold, and a third threshold;

determine whether the feedback signal, the second threshold, and the third threshold satisfy a third predetermined criterion;

determine whether the operation mode is a quasi-resonant foldback mode based on at least whether the third predetermined criterion is determined to be satisfied, the quasi-resonant foldback mode being different from the quasi-resonant mode;

if the operation mode is determined to be the quasi-resonant foldback mode, send the mode selection signal to the quasi-resonant foldback mode controller to generate the switch signal corresponding to the quasi-resonant foldback mode.

24. The switch-mode power conversion system of claim 23 wherein the third predetermined criterion is that the feedback signal is smaller than the second threshold and larger than the third threshold in magnitude.

25. The switch-mode power conversion system of claim 23 wherein:

the first mode controller further includes at least a burst mode controller;

the first mode controller is further configured to;

determine whether the feedback signal and the third threshold satisfy a fourth predetermined criterion;

determine whether the operation mode is a burst mode based on at least whether the fourth predetermined criterion is determined to be satisfied;

if the operation mode is determined to be the burst mode, send the mode selection signal to the burst mode controller to generate the switch signal corresponding to the burst mode.

26. The switch-mode power conversion system of claim 25 wherein the fourth predetermined criterion is that the feedback signal is smaller than the third threshold in magnitude.

27. A method for determining an operation mode for a switch-mode power conversion system, the method comprising:

receiving an input voltage by a primary winding and a voltage detector;

generating a detection signal by the voltage detector based on at least information associated with the input voltage;

generating an output signal based on at least information associated with the input voltage;

receiving the output signal by a feedback component;

generating a feedback signal based on at least information associated with the output signal;

receiving the detection signal and the feedback signal by a mode controller;

generating a switch signal based on at least information associated with the detection signal and the feedback signal;

affecting a first current flowing through the primary winding based on at least information associated with the switch signal;

wherein the process for generating a switch signal based on at least information associated with the detection signal and the feedback signal includes;

processing information associated with the detection signal and a first threshold;

determining whether the detection signal and the first threshold satisfy a first predetermined criterion;

processing information associated with the feedback signal and a second threshold;

determining whether the feedback signal and the second threshold satisfy a second predetermined criterion;

determining whether an operation mode for the switch-mode power conversion system is a quasi-resonant mode based on at least whether the first predetermined criterion is determined to be satisfied and whether the second predetermined criterion is determined to be satisfied;

wherein the switch signal corresponds to the operation mode for the switch-mode power conversion system.

28. The method of claim 27 wherein the first predetermined criterion is that the detection signal is larger than the first threshold in magnitude.

29. The method of claim 27 wherein the second predetermined criterion is that the feedback signal is larger than the second threshold in magnitude.

30. The method of claim 27 wherein the process for generating a switch signal based on at least information associated with the detection signal and the feedback signal includes determining whether the operation mode is a fixed frequency mode based on at least whether the first predetermined criterion is determined to be satisfied and whether the second predetermined criterion is determined to be satisfied.

31. The method of claim 30 wherein the fixed frequency mode is a continuous current mode.

32. The method of claim 30 wherein the first predetermined criterion is that the detection signal is larger than the first threshold in magnitude.

33. The method of claim 32 wherein the second predetermined criterion is that the feedback signal is larger than the second threshold in magnitude.

34. The method of claim 30 wherein the process for generating a switch signal based on at least information associated with the detection signal and the feedback signal further includes:

processing information associated with the feedback signal, the second threshold, and a third threshold;

determining whether the feedback signal, the second threshold, and the third threshold satisfy a third predetermined criterion;

determining whether the operation mode is a quasi-resonant foldback mode based on at least whether the third predetermined criterion is determined to be satisfied, the quasi-resonant foldback mode being different from the quasi-resonant mode.

35. The method of claim 34 wherein the third predetermined criterion is that the feedback signal is smaller than the second threshold and larger than the third threshold in magnitude.

36. The method of claim 34 wherein the process for generating a switch signal based on at least information associated with the detection signal and the feedback signal further includes:

determining whether the feedback signal and the third threshold satisfy a fourth predetermined criterion;

determining whether the operation mode is a burst mode based on at least whether the fourth predetermined criterion is determined to be satisfied.

37. The method of claim 36 wherein the fourth predetermined criterion is that the feedback signal is smaller than the third threshold in magnitude.