Title:
ADAPTIVE DEAD-TIME CONTROL OF A SYNCHRONOUS BUCK CONVERTER
Document Type and Number:
WIPO Patent Application WO/2023/159657
Kind Code:
A1
Abstract:
A start-up routine for a Switched-Mode Power Supply (SMPS) gradually increases the duty cycle while reducing an initial dead time to a final optimal dead time for normal operation. Reliability is improved by the larger initial dead time that reduces ringing in switching transistors during low-voltage conditions early in the start-up sequence. Efficiency is improved by reducing the optimal dead time as voltages approach operating levels. The initial dead time is pre-calculated as a function of the input voltage and initial duty cycle. Optimal dead times are pre-calculated as a function of output voltage and output current. The optimal dead time is adjusted for each iteration of a second loop that also increases duty cycle until the target operating output voltage is reached. Pre-calculated dead times are based on the time required to fully charge and discharge parasitic drain-to-source capacitances in the switching transistors in the SMPS circuit.
Inventors:
SHUM TAK LOK (CN)
HU XIAOYONG (CN)
CHENG YUXIE (CN)
HU XIAOYONG (CN)
CHENG YUXIE (CN)
Application Number:
PCT/CN2022/078707
Publication Date:
August 31, 2023
Filing Date:
March 02, 2022
Export Citation:
Assignee:
HONG KONG APPLIED SCIENCE & TECH RESEARCH INST CO LTD (CN)
International Classes:
H02M1/36; H02M1/38; H02M3/158
Foreign References:
| JP2005210820A | 2005-08-04 | |||
| CN109004830A | 2018-12-14 | |||
| CN108377094A | 2018-08-07 | |||
| US10951207B1 | 2021-03-16 | |||
| US20170187284A1 | 2017-06-29 |
Other References:
EKHTIARI MARZIEH; ANDERSEN THOMAS; ANDERSEN MICHAEL A. E.; ZHANG ZHE: "Dynamic Optimum Dead Time in Piezoelectric Transformer-Based Switch-Mode Power Supplies", IEEE TRANSACTIONS ON POWER ELECTRONICS, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, USA, vol. 32, no. 1, 1 January 2017 (2017-01-01), USA , pages 783 - 793, XP011623407, ISSN: 0885-8993, DOI: 10.1109/TPEL.2016.2533632
Attorney, Agent or Firm:
CHINA TRUER IP (CN)
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