Power conversion device and method for correcting decision threshold level thereof

Patent metadata

Field	Value
Publication number	US-9948189-B2
Application number	US-201615162096-A
Country	US
Kind code	B2
Filing date	May 23, 2016
Priority date	May 23, 2016
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A power conversion device and a method for correcting decision threshold level thereof are disclosure. The method for correcting awaking-voltage of a power conversion device is provided. The method includes: fixing an output current of the power conversion module; monitoring a real decision threshold level of the power conversion module when the power conversion module departs from a burst mode; adjusting a preset decision threshold level based on the comparison between the real decision threshold level and the preset decision threshold level to make the preset voltage be equal to the real decision threshold level.

First claim

What is claimed is:

1. A method for correcting decision threshold level of a power conversion device comprising:
a) fixing an output current of the power conversion device;
b) monitoring a real decision threshold level of the power conversion device, wherein the real decision threshold level of the power conversion device is a voltage which the power conversion device departs from a burst mode;
c) providing a variable resistor, wherein the variable resistor is electrically connecting to the power conversion device; and
d) adjusting a preset decision threshold level by varying a resistance of the variable resistor based on a comparison between the real decision threshold level and the preset decision threshold level to make the preset decision threshold level be equal to the real decision threshold level.

2. The method of claim 1 , wherein the resistance of the variable resistor is varied according to a voltage comparison between the real decision threshold level and the preset decision threshold level.

3. The method of claim 1 , where step a, b, d is performed by a control unit.

4. The method of claim 1 , wherein in the step for fixing the output current of the power conversion device, the fixed output current is equal to a current that makes the power conversion module exit the burst mode.

5. A power conversion device comprising:
a power conversion module;
a control unit electrically connected to the power conversion module, wherein the control unit providing a preset decision threshold level, and the preset decision threshold level is a voltage which the power conversion module exits from a burst mode; and
a variable resistor connected to an operation mode selecting pin of the control unit for setting the preset decision threshold level,
wherein when a real decision threshold level of the power conversion module is different from the preset decision threshold level, the control unit varies the resistance of the variable resistor based on a comparison between the real decision threshold level and the preset decision threshold level to make the preset decision threshold level be equal to the real decision threshold level.

6. The power conversion device of claim 5 , wherein the control unit automatically varies the resistance of the variable resistor to make the preset decision threshold level be equal to the real preset-voltage.

7. The power conversion device of claim 5 , wherein the power conversion module is LLC resonant power conversion module.

Assignees

• Chicony Power Tech Co Ltd

Inventors

• Chen Ti-Te
• Huang chao-yi
• Chen Kuo-Cheng

Classifications

• H02M3/33507 Primary

  with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence) · CPC title

• H02M1/08

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

• H02M3/33571 Primary

  Half-bridge at primary side of an isolation transformer · CPC title

• H02M3/01

  Resonant DC/DC converters · CPC title

• H02M1/0025

  Arrangements for modifying reference values, feedback values or error values in the control loop of a converter · CPC title