IP Library › Granted Patent US 11,581,815

Granted Patent B2

US 11,581,815 · App. 16/787,869 · Granted Feb 14, 2023

Systems and methods for regulating power conversion systems with output detection and synchronized rectifying mechanisms

Inventors: Yaming Cao (Shanghai, CN); Qiang Luo (Shanghai, CN); Yuan Lin (Shanghai, CN); Lieyi Fang (Shanghai, CN)

Assignee: On-Bright Electronics (Shanghai) Co., Ltd.

H02M3/33515 H02M1/08 H02M3/33507 H02M3/33592 H02M1/0009 H02M1/0032 H02M1/0048 H02M3/33523 H02M3/33576 Y02B70/10

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Quick Facts

Patent No.: US 11,581,815
App. No.: 16/787,869
Granted: Feb 14, 2023
Kind: B2

External Links

USPTO Patent Center↗ Full Patent PDF↗

Abstract

System controller and method for regulating a power converter. For example, the system controller includes a first controller terminal and a second controller terminal. The system controller is configured to receive an input signal at the first controller terminal and generate a drive signal at the second controller terminal based at least in part on the input signal to turn on or off a transistor in order to affect a current associated with a secondary winding of the power converter. Additionally, the system controller is further configured to determine whether the input signal remains larger than a first threshold for a first time period that is equal to or longer than a first predetermined duration.

Claims (182)

1. A system controller for regulating a power converter, the system controller comprising:

a first controller terminal; and

a second controller terminal;

wherein the system controller is configured to:

receive an input signal at the first controller terminal; and

generate a drive signal at the second controller terminal based at least in part on the input signal;

wherein the system controller is further configured to:

determine whether the input signal remains larger than a first threshold for a first time period that is equal to or longer than a first predetermined duration; and

determine whether the input signal remains larger than a second threshold for a second time period that is equal to or longer than a second predetermined duration, the second threshold being smaller than the first threshold, the second predetermined duration being longer than the first predetermined duration;

wherein the system controller is further configured to:

in response to the input signal not being determined to remain larger than the first threshold for the first time period that is equal to or longer than the first predetermined duration and the input signal not being determined to remain larger than the second threshold for the second time period that is equal to or longer than the second predetermined duration, operate with a first mechanism; and

in response to the input signal being determined to remain larger than the first threshold for the first time period that is equal to or longer than the first predetermined duration or the input signal being determined to remain larger than the second threshold for the second time period that is equal to or longer than the second predetermined duration, operate with a second mechanism;

wherein, operating with the first mechanism, the system controller is further configured to:

determine whether the input signal remains smaller than a third threshold for a third time period that is equal to or longer than a third predetermined duration; and

in response to the input signal being determined to remain smaller than the third threshold for the third time period that is equal to or longer than the third predetermined duration, change the drive signal at the second controller terminal from a first logic level to a second logic level;

wherein the second mechanism is different from the first mechanism.

2. The system controller of claim 1 wherein:

operating with the second mechanism, the system controller is further configured to:

determine whether the input signal becomes smaller than the third threshold; and

in response to the input signal being determined to become smaller than the third threshold, change the drive signal at the second controller terminal.

3. The system controller of claim 1 wherein the system controller is further configured to, in response to the input signal being determined to remain larger than the first threshold for the first time period that is equal to or longer than the first predetermined duration and the input signal being determined to remain larger than the second threshold for the second time period that is equal to or longer than the second predetermined duration, operate with the second mechanism.

4. The system controller of claim 1 wherein the system controller is further configured to, after the drive signal is changed from the first logic level to the second logic level, in response to the input signal being determined to become smaller than the third threshold regardless of whether the input signal remains smaller than the third threshold for the third time period that is equal to or longer Ian the third predetermined duration, operate with the first mechanism.

5. The system controller of claim 1 wherein:

the first mechanism is a slow turn-on mechanism; and

the second mechanism is a fast turn-on mechanism.

6. The system controller of claim 1 wherein:

the first logic level is a logic low level; and

the second logic level is a logic high level.

7. The system controller of claim 1 wherein the system controller is further configured to, in response to changing the drive signal from the first logic level to the second logic level, turn on a transistor.

8. The system controller of claim 1 wherein:

the third threshold is smaller than the first threshold; and

the third threshold is smaller than the second threshold.

9. The system controller of claim 1 wherein the system controller is further configured to:

determine whether the input signal becomes smaller than the third threshold; and

in response to the input signal being determined to become smaller than the third threshold,

if the system controller operates with the first mechanism, after a delay, change the drive signal at the second controller terminal; and

if the system controller operates with the second mechanism, without a delay, change the drive signal at the second controller terminal.

10. A system controller for regulating a power converter, the system controller comprising:

a first controller terminal; and

a second controller terminal;

wherein the system controller is configured to:

receive an input signal at the first controller terminal; and

generate a drive signal at the second controller terminal based at least in part on the input signal;

wherein the system controller is further configured to:

determine whether the input signal remains larger than a first threshold for a first time period that is equal to or longer than a first predetermined duration; and

determine whether the input signal remains larger than a second threshold for a second time period that is equal to or longer than a second predetermined duration;

wherein the system controller is further configured to:

wherein:

the second mechanism is different from the first mechanism;

the second threshold is smaller than the first threshold; and

the second predetermined duration is longer than the first predetermined duration;

wherein:

the first threshold changes with the input signal in magnitude; and

the second threshold changes with the input signal in magnitude.

11. The system controller of claim 10 wherein:

the first threshold increases with the input signal in magnitude; and

the second threshold increases with the input signal in magnitude.

12. The system controller of claim 11 wherein:

the first threshold increases linearly with the input signal in magnitude; and

the second threshold increases linearly with the input signal in magnitude.

13. The system controller of claim 10 wherein:

the system controller is further configured to:

in response to the input signal being determined to remain larger than the second threshold for the second time period that is equal to or longer than the second predetermined duration, operate with the second mechanism;

wherein, operating with the second mechanism, the system controller is further configured to:

determine whether the input signal becomes smaller than a third threshold; and

in response to the input signal being determined to become smaller than the third threshold, change the drive signal at the second controller terminal.

14. The system controller of claim 13 wherein:

operating with the first mechanism, the system controller is further configured to:

determine whether the input signal remains smaller than the third threshold for a third time period that is equal to or longer than a third predetermined duration; and

15. The system controller of claim 14 wherein:

the first logic level is a logic low level; and

the second logic level is a logic high level.

16. The system controller of claim 14 wherein the system controller is further configured to, in response to changing the drive signal from the first logic level to the second logic level, turn on a transistor.

17. The system controller of claim 13 wherein:

the third threshold is smaller than the first threshold; and

the third threshold is smaller than the second threshold.

18. The system controller of claim 10 wherein:

the first mechanism is a slow turn-on mechanism; and

the second mechanism is a fast turn-on mechanism.

19. The system controller of claim 10 wherein the system controller is further configured to:

determine whether the input signal becomes smaller than a third threshold; and

in response to the input signal being determined to become smaller than the third threshold,

if the system controller operates with the first mechanism, after a delay, change the drive signal at the second controller terminal; and

if the system controller operates with the second mechanism, without a delay, change the drive signal at the second controller terminal.

20. A system controller for regulating a power converter, the system controller comprising:

a first controller terminal; and

a second controller terminal;

wherein the system controller is configured to:

receive an input signal at the first controller terminal; and

generate a drive signal at the second controller terminal based at least in part on the input signal;

wherein the system controller is further configured to:

determine whether the input signal remains larger than a first threshold for a first time period that is equal to or longer than a first predetermined duration; and

determine whether the input signal remains larger than a second threshold for a second time period that is equal to or longer than a second predetermined duration;

wherein the system controller is further configured to:

wherein:

the second mechanism is different from the first mechanism;

the second threshold is smaller than the first threshold; and

the second predetermined duration is longer than the first predetermined duration;

wherein:

the first predetermined duration changes with the input signal in magnitude; and

the second predetermined duration changes with the input signal in magnitude.

21. The system controller of claim 20 wherein:

the first predetermined duration increases with the input signal in magnitude; and

the second predetermined duration increases with the input signal in magnitude.

22. The system controller of claim 21 wherein:

the first predetermined duration increases linearly with the input signal in magnitude; and

the second predetermined duration increases linearly with the input signal in magnitude.

23. The system controller of claim 20 wherein:

the system controller is further configured to:

wherein, operating with the second mechanism, the system controller is further configured to:

determine whether the input signal becomes smaller than a third threshold; and

in response to the input signal being determined to become smaller than the third threshold, change the drive signal at the second controller terminal.

24. The system controller of claim 23 wherein:

operating with the first mechanism, the system controller is further configured to:

determine whether the input signal remains smaller than the third threshold for a third time period that is equal to or longer than a third predetermined duration; and

in response to the input signal being determined to remain smaller than the third threshold for the third time period that is equal to or longer than the third predetei mined duration, change the drive signal at the second controller terminal from a first logic level to a second logic level.

25. The system controller of claim 24 wherein:

the first logic level is a logic low level; and

the second logic level is a logic high level.

26. The system controller of claim 24 wherein the system controller is further configured to, in response to changing the drive signal from the first logic level to the second logic level, turn on a transistor.

27. The system controller of claim 23 wherein:

the third threshold is smaller than the first threshold; and

the third threshold is smaller than the second threshold.

28. The system controller of claim 20 wherein:

the first mechanism is a slow turn-on mechanism; and

the second mechanism is a fast turn-on mechanism.

29. The system controller of claim 20 wherein the system controller is further configured to:

determine whether the input signal becomes smaller than a third threshold; and

in response to the input signal being determined to become smaller than the third threshold,

if the system controller operates with the first mechanism, after a delay, change the drive signal at the second controller terminal; and

if the system controller operates with the second mechanism, without a delay, change the drive signal at the second controller terminal.

30. A method for regulating a power converter, the method comprising:

receiving an input signal;

processing information associated with the input signal; and

generating a drive signal based at least in part on the input signal;

wherein the processing information associated with the input signal includes:

determining whether the input signal remains larger than a first threshold for a first time period that is equal to or longer than a first predetermined duration;

determining whether the input signal remains larger than a second threshold for a second time period that is equal to or longer than a second predetermined duration, the second threshold being smaller than the first threshold, the second predetermined duration being longer than the first predetermined duration;

wherein the generating a drive signal based at least in part on the input signal includes, in response to operating with the first mechanism,

determining whether the input signal remains smaller than a third threshold for a third time period that is equal to or longer than a third predetermined duration; and

in response to the input signal being determined to remain smaller than the third threshold for the third time period that is equal to or longer than the third predetermined duration, changing the drive signal from a first logic level to a second logic level;

wherein the second mechanism is different from the first mechanism.

31. A method for regulating a power converter, the method comprising:

receiving an input signal;

processing information associated with the input signal; and

generating a drive signal based at least in part on the input signal;

wherein the processing information associated with the input signal includes:

determining whether the input signal remains larger than a first threshold for a first time period that is equal to or longer than a first predetermined duration;

determining whether the input signal remains larger than a second threshold for a second time period that is equal to or longer than a second predetermined duration;

wherein:

the second mechanism is different from the first mechanism;

the second threshold is smaller than the first threshold; and

the second predetermined duration is longer than the first predetermined duration;

wherein:

the first threshold changes with the input signal in magnitude; and

the second threshold changes with the input signal in magnitude.

32. A method for regulating a power converter, the method comprising:

receiving an input signal;

processing information associated with the input signal; and

generating a drive signal based at least in part on the input signal;

wherein the processing information associated with the input signal includes:

determining whether the input signal remains larger than a first threshold for a first time period that is equal to or longer than a first predetermined duration;

determining whether the input signal remains larger than a second threshold for a second time period that is equal to or longer than a second predetermined duration;

wherein:

the second mechanism is different from the first mechanism;

the second threshold is smaller than the first threshold; and

the second predetermined duration is longer than the first predetermined duration;

wherein:

the first predetermined duration changes with the input signal in magnitude; and

the second predetermined duration changes with the input signal in magnitude.

Assignments (1)

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 18, 2020

From: CAO, YAMING; LUO, QIANG; LIN, YUAN; FANG, LIEYI

To: ON-BRIGHT ELECTRONICS (SHANGHAI) CO., LTD.

Reel/Frame 052157/0767 →

Priority Claims (3)

CN 201210118202.7 · Apr 12, 2012 · national

CN 201410729533.3 · Dec 4, 2014 · national

CN 201710534527.6 · Jul 3, 2017 · national

Continuity (6)

Continuation 15719283 · Sep 28, 2017

Continuation 15665264 · Jul 31, 2017

Continuation In Part 15204324 · Jul 7, 2016

Continuation 14602944 · Jan 22, 2015

Continuation In Part 13466808 · May 8, 2012

Related Publication 20200280260A1 · Sep 3, 2020

Cited By (4)

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