Systems and methods for regulating output currents of power conversion systems

• US 10,044,254 B2
• Filed: 12/06/2016
• Issued: 08/07/2018
• Est. Priority Date: 04/18/2014
• 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: Zhai, Xiangkun, Zhang, Yunchao, Zhou, Jun, Fang, Lieyi
• Primary Examiner(s): Mehari, Yemane
• Application Number:
  US15/371,058
• Publication Number:
  US 20170179808A1
• Time in Patent Office: 609 Days
• Field of Search: 363 2101- 2118
• CPC Class Codes: H02M 1/0006 Arrangements for supplying an adequate voltage to the control circuit of converters
• CPC Class Codes: H02M 1/0009 Devices or circuits for detecting current in a converter
• CPC Class Codes: H02M 1/08 Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• CPC Class Codes: H02M 1/36 Means for starting or stopping converters
• 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: H02M 3/33523 with galvanic isolation between input and output of both the power stage and the feedback loop
• CPC Class Codes: H02M 3/33546 with automatic control of the output voltage or current H02M3/33561 takes precedence
• CPC Class Codes: H03K 17/16 Modifications for eliminating interference voltages or currents
• CPC Class Codes: H03K 17/56 by the use, as active elements, of semiconductor devices using diodes H03K17/74
• CPC Class Codes: H03K 17/723 using transformer coupling
• CPC Class Codes: H03K 3/012 Modifications of generator to improve response time or to decrease power consumption
• CPC Class Codes: H03K 7/08 Duration or width modulation ; Duty cycle modulation
• CPC Class Codes: H05B 45/305 Frequency-control circuits
• CPC Class Codes: H05B 45/345 Current stabilisation; Maintaining constant current
• CPC Class Codes: H05B 45/3725 Switched mode power supply [SMPS]
• CPC Class Codes: H05B 45/382 with galvanic isolation between input and output
• CPC Class Codes: H05B 45/397 Current mirror circuits
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

Systems and methods are provided for regulating a power conversion system. An example system controller includes a first controller terminal and a second controller terminal. The first controller terminal is configured to receive a first signal associated with an input signal for a primary winding of a power conversation system. The second controller terminal is configured to output a drive signal to a switch to affect a first current flowing through the primary winding of the power conversion system, the drive signal being associated with an on-time period, the switch being closed during the on-time period. The system controller is configured to adjust a duration of the on-time period based on at least information associated with the first signal.

Claims

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

a first controller terminal configured to receive a first signal associated with an input signal for a primary winding of a power conversation system; and

a second controller terminal configured to output a drive signal to a switch to affect a first current flowing through the primary winding of the power conversion system, the drive signal being associated with an on-time period, the switch being closed during the on-time period;

wherein the system controller is configured to adjust a duration of the on-time period based on at least information associated with the first signal.

2. The system controller of claim 1 wherein the input signal corresponds to an input voltage.

3. The system controller of claim 1, further comprising a first conversion component configured to generate a second current based on at least information associated with the first signal.

4. The system controller of claim 1, further comprising:

a demagnetization detector configured to receive a feedback signal associated with an output signal of the power conversion system and generates a trigger signal based on at least information associated with the feedback signal; and

a logic controller configured to receive the trigger signal and output a second signal based on at least information associated with the trigger signal to affect the drive signal.

5. The system controller of claim 1 wherein:

the first controller terminal is coupled to a first resistor terminal of a first resistor;

a second resistor terminal of the first resistor is configured to receive the input signal; and

the first resistor terminal of the first resistor is configured to provide the first signal.

6. The system controller of claim 1 wherein the first signal corresponds to a feedback current related to a first voltage associated with an auxiliary winding of the power conversion system.

7. The system controller of claim 1 wherein:

the first controller terminal is a first pin; and

the second controller terminal is a second pin.

8. The system controller of claim 1 wherein the system controller operates in a voltage mode.

9. The system controller of claim 1 wherein the power conversion system operates in a quasi-resonant mode.

10. A method for regulating a power conversion system, the method comprising:

receiving a first signal from a first controller terminal, the first signal being associated with an input signal for a primary winding of a power conversation system;

adjusting a duration of an on-time period related to a drive signal based on at least information associated with the first signal; and

outputting the drive signal from a second controller terminal to a switch to affect a first current flowing through the primary winding of the power conversion system, the switch being closed during the on-time period.