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Apparatus For Improving Stability And Dynamic Response Of Half-Bridge Converter

Summary

Typically, In A Half-Bridge Converter A Dc Blocking Capacitor And Inductance On The Primary Side Combines With The Inductor And Capacitor On The Secondary Side To Produce Complicated Converter Dynamic Characteristics That Make Converter Stabilization Difficult. The Disclosed System And Methods Enable Converter Stabilization By Modulating, As A Function Of The Voltage Across The Dc Blocking Capacitor, The Feedback Output Error Signal Or The Ramp Signal For The Pwm Controller Of The Converter. The Modulation Removes The Effect Of The Resonant Circuit Formed By The Primary Inductance And The Dc Blocking Capacitor In The Output Voltage Regulation Loop. Further Adjustment Of The Duty Cycle Of The Power Switches Enables Keeping The Output Voltage Undisturbed By Voltage Variation Across The Dc Blocking Capacitor. Since, This Inner Compensation Loop Results In The Voltage Regulation Feedback Loop Respond To Only The Output Inductor-Capacitor Filter, The Transfer Function Of This Loop Displays Second Order Characteristics From The Fourth Order. Hence, Stability Issues Are Simplified To Conventional Second Order Compensation Network Whereby The Converter Can Be Optimized For Fast Transient Response.

Supplementary Information

Patent Number: US6396716B1
Application Number: US2001960435A
Inventor: Liu, Chui Pong Joe | Poon, Ngai Kit Franki | Pong, Man Hay Bryan
Priority Date: 20 Sep 2001
Priority Number: US6396716B1
Application Date: 20 Sep 2001
Publication Date: 28 May 2002
IPC Current: H02M0003335 | H02M0003337
US Class: 363017 | 363132
Assignee Applicant: The University of Hong Kong
Title: Apparatus for improving stability and dynamic response of half-bridge converter
Usefulness: Apparatus for improving stability and dynamic response of half-bridge converter
Summary: For DC to DC voltage conversion.
Novelty: Power converter for DC to DC voltage conversion modulates the feedback output error signal or ramp signal for the pulse width modulation controller as a function of the blocking capacitor voltage

Industry

Electronics

Sub Category

Circuit Design

Application No.

US2001960435A

Country/Region

Hong Kong