System and method for controlling output signal of power converter

Patent metadata

Field	Value
Publication number	US-2019252984-A1
Application number	US-201916392153-A
Country	US
Kind code	A1
Filing date	Apr 23, 2019
Priority date	Jun 2, 2016
Publication date	Aug 15, 2019
Grant date	—

Abstract

A method includes generating a gain transition signal in response to any one of an average value of a feedback signal, a slope of the feedback signal, a slope of an input signal of the power converter, a maximum value of the input signal, and a minimum value of the input signal, and generating a first gain control signal and a second gain control signal in response to the gain transition signal. A gain transition controller includes a transition signal generator generating the gain transition signal and a gain control signal generator generating the first gain control signal and the second gain control signal in response to the gain transition signal.

First claim

What is claimed is:

1 . A method for controlling a power converter, the method comprising:
generating a gain transition signal in response to any one of an average value of a feedback signal, a slope of the feedback signal, a slope of an input signal of the power converter, a maximum value of the input signal, and a minimum value of the input signal, the gain transition signal indicating a transition of the power converter from a first gain mode to a second gain mode; and generating a first gain control signal and a second gain control signal in response to the gain transition signal.

2 . The method of claim 1 , further comprising generating a reference feedback signal indicative of an average value of the feedback signal over a given time period.

3 . The method of claim 1 , wherein generating the gain transition signal comprises asserting the gain transition signal to have a specific logic value when the slope of the feedback signal is equal to or less than a given value.

4 . The method of claim 1 , wherein generating the gain transition signal comprises asserting the gain transition signal to have a specific logic value when the slope of the input signal is equal to or less than a given value.

5 . The method of claim 1 , further comprising synchronizing the gain transition signal with the input signal of the power converter.

6 . The method of claim 5 , wherein synchronizing the gain transition signal comprises:
asserting an output signal at a first time when the input signal has a given value; and delaying the output signal by a given delay amount to assert the gain transition signal at a second time, the feedback signal having a minimum value at the second time.

7 . The method of claim 1 , wherein a time interval in the first gain mode includes a transient period and a steady state period, the method further comprising generating the feedback signal in response to the first gain control signal and the second gain control signal, the power converter increasing a value of an output signal during the transient period of the first gain mode in response to the feedback signal.

8 . The method of claim 1 , wherein the first gain mode is a proportional gain mode and the second gain mode is an integral gain mode.

9 . The method of claim 1 , wherein a time interval in the first gain mode including a transient period and a steady state period, the method further comprising keeping a value of the feedback signal at a maximum value during the transient period of the first gain mode.

10 . The method of claim 1 , further comprising:
reducing one or both of an on-time duration and a switching frequency of a modulation signal when a value of the feedback signal is decreased; and increasing one or both of the on-time duration and the switching frequency of the modulation signal when the value of the feedback signal is increased.

11 . A gain transition controller circuit for controlling a power converter comprising:
a transition signal generator configured to generate a gain transition signal in response to any one of an average value of a feedback signal, a slope of the feedback signal, a slope of an input signal of the power converter, a maximum value of the input signal, and a minimum value of the input signal, the gain transition signal indicating a transition of the power converter from a first gain mode to a second gain mode; and a gain control signal generator configured to generate a first gain control signal and a second gain control signal in response to the gain transition signal.

12 . The controller of claim 11 , wherein the transition signal generator includes a reference feedback signal generator generating a reference feedback signal indicative of an average value of the feedback signal over a given time period.

13 . The controller of claim 11 , wherein the transition signal generator includes a slope detector generating the gain transition signal having a specific logic value when the slope of the feedback signal is equal to or less than a given value.

14 . The controller of claim 11 , wherein the transition signal generator includes a slope detector generating the gain transition signal having a specific logic value when the slope of the input signal is equal to or less than a given value.

15 . The controller of claim 11 , wherein the transition signal generator includes:
a synchronizing circuit asserting an output signal at a first time when the input signal has a given value; and a delay circuit delaying the output signal of the synchronizing circuit by a given delay amount to assert the gain transition signal at a second time, the feedback signal having a minimum value at the second time.

16 . The controller of claim 11 , wherein a time interval in the first gain mode includes a transient period and a steady state period, the controller further comprising a gain control circuit generating the feedback signal in response to the first gain control signal and the second gain control signal, the power converter increasing a value of an output signal during the transient period of the first gain mode in response to the feedback signal.

17 . The controller of claim 16 , wherein the gain control circuit includes:
an amplifier generating the feedback signal in response to a tracking signal and a reference signal, the tracking signal indicating the output signal of the power converter; an output node outputting the feedback signal; a first switching device operating in response to the first gain control signal; a first resistor having a first end connected to the first switching device and a second end connected to a ground; and a second resistor having a first end connected to the output node and a second end connected to a first end of a capacitor.

18 . The circuit of claim 17 , wherein the gain control circuit further includes a second switching device operating in response to the second gain control signal and being coupled to the second resistor in parallel, and
wherein a second end of the capacitor is connected to the ground.

19 . A power converter comprising:
a gain transition controller configured to generate a first gain control signal and a second gain control signal in response to a gain transition signal, the gain transition signal indicating a transition of the power converter from a proportional gain mode to an integral gain mode, a time interval in the proportional gain mode including a transient period and a steady state period; a gain control circuit configured to generate a feedback signal in response to the first gain control signal and the second gain control signal, the power converter increasing a value of an output signal during the transient period of the proportional gain mode in response to the feedback signal; and a modulation controller configured to generate a modulation signal in response to the feedback signal.

20 . The circuit of claim 19 , wherein the modulation controller reduces one or both of an on-time duration and a switching frequency of the modulation signal when a value of the feedback signal is decreased, and
wherein the modulation controller increases one or both of the on-time duration and the switching frequency of the modulation signal when the value of the feedback signal is increased.

Assignees

• Semiconductor Components Ind Llc

Inventors

• Eum Hyun-Chul
• Kim Tae-Sung
• Yang Young-Mo
• Yun Sung-Won
• Jin Woo-Kang

Classifications

• H05B45/48

  having LEDs organised in strings and incorporating parallel shunting devices · CPC title

• H05B45/44

  with an active control inside an LED matrix · CPC title

• H05B45/37

  Converter circuits · CPC title

• H02M1/08

  Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters · CPC title

• H02M1/36

  Means for starting or stopping converters · CPC title