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Method for frequency reduction of quasi-resonant qr converter and controller for quasi-resonant qr converter

A converter, quasi-resonant technology, applied in the field of quasi-resonant power converters, can solve problems such as large switching loss

Active Publication Date: 2021-09-07
SEMICON COMPONENTS IND LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Higher frequency switching is not desirable as it causes large switching losses

Method used

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  • Method for frequency reduction of quasi-resonant qr converter and controller for quasi-resonant qr converter
  • Method for frequency reduction of quasi-resonant qr converter and controller for quasi-resonant qr converter
  • Method for frequency reduction of quasi-resonant qr converter and controller for quasi-resonant qr converter

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Experimental program
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Embodiment Construction

[0022] Quasi-resonant power converters suffer from audible noise and low efficiency when providing wide input and output ranges. Specifically, a converter capable of driving high loads will increase the pulse width modulation (PWM) frequency at light loads, resulting in inefficient operation. Additionally, compliance with Energy Star and other "power-saving" regulations has driven the use of the Burst Mode feature, which can also generate audible noise under certain load conditions.

[0023] figure 1 An embodiment of a QR converter 10 is shown that includes a controller configured to base on the sensed current (Vcs) from the primary side, the secondary (output) voltage Vs inferred from the auxiliary winding, and the optocoupler to the output The feedback signal (FB) of the primary side (eg, low side) switches the gate.

[0024] The QR converter 10 receives a voltage at an input terminal 12 referenced to a ground terminal 14 and generates an output voltage (Vo) between a posi...

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PUM

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Abstract

The present application relates to a method for frequency reduction of a quasi-resonant QR converter and a controller for a quasi-resonant QR converter. The present invention discloses a method for frequency reduction of a quasi-resonant QR converter, the method comprising detecting a valley point of a resonant waveform of a QR converter by detecting that the voltage level of the resonant waveform drops below a first threshold voltage. Forms the blanking time from the start of the QR transition cycle to the trough point. The blanking time is extended in response to the first decrease in the output load of the QR converter while maintaining the primary current of the QR converter at the first current level. The primary current is reduced to a second current level that is less than the first current level in response to the second decrease in output load while maintaining the blanking time at the maximum blanking time.

Description

[0001] Cross References to Related Applications [0002] This application is a joint pending application for the title "ADVANCED FREQUENCY REDUCTION WITH QUASI-RESONANT CONTROL FOR WIDE INPUT AND OUTPUT CONDITIONS" (Advanced Frequency Reduction Using Quasi-Resonant Control for Wide Input and Output Conditions), filed March 10, 2017. Priority utility application to pending U.S. Provisional Application No. 62 / 469,873, which is hereby incorporated by reference in its entirety. technical field [0003] The present disclosure relates generally to quasi-resonant power converters, and more particularly to reducing the switching frequency of a power converter while improving audible noise reduction during burst mode operation. Background technique [0004] A quasi-resonant (QR) power converter transfers packets of energy from the primary side of the transformer to the secondary side of the transformer. This energy transfer is controlled by switching transistors on the primary side ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M7/48
CPCH02M3/33523H02M7/48H02M7/4815H02M1/0035H02M1/0058Y02B70/10H02M3/33507
Inventor 徐乾尊林立朴英培
Owner SEMICON COMPONENTS IND LLC