A 10MHz, 40V-to-5V clock-synchronized AOT hysteretic converter with programmable soft start technique for automotive USB chargers

Xugang Ke, Kang Wei, D. Brian Ma

Research output: ResearchConference contribution

Abstract

Adaptive on-time (AOT) hysteretic control has gained increasing popularity in automotive electronics, because of its superior line regulation and fast load transient response. However, it faces serious switching frequency deviation and soft start issues from the conventional implementations. To mitigate these, this paper proposes a clock-synchronized AOT hysteretic control which adaptively synchronizes the switching converter to a desirable reference frequency without degrading its line regulation and load transient response. Meanwhile, a programmable soft start modulator is proposed to allow reliable start-up in heavy load condition and prevent large inrush current from damaging the power devices. Designed on a high voltage (HV) 0.35μm BCD process, the integrated converter achieves a single-stage 40V to 5V voltage conversion with a full load of 15W and a peak efficiency of 90.5%. With the proposed clock-synchronized Ton timer, the switching frequency is maintained at a fixed 10MHz, over the full input, output and load ranges. The programmable soft start modulator achieves 100μs to 6ms soft start time, which greatly suppresses startup inrush current.

LanguageEnglish (US)
Title of host publication2017 IEEE Applied Power Electronics Conference and Exposition, APEC 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2146-2149
Number of pages4
ISBN (Electronic)9781509053667
DOIs
StatePublished - May 17 2017
Event32nd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2017 - Tampa, United States
Duration: Mar 26 2017Mar 30 2017

Other

Other32nd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2017
CountryUnited States
CityTampa
Period3/26/173/30/17

Fingerprint

Switching frequency
Transient analysis
Modulators
Clocks
Electric potential
Automobile electronic equipment

Keywords

  • Adaptive On-Time (AOT)
  • Automotive USB Charger
  • Clock-Synchronization (CS)
  • Programmable Soft Start Technique

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Ke, X., Wei, K., & Ma, D. B. (2017). A 10MHz, 40V-to-5V clock-synchronized AOT hysteretic converter with programmable soft start technique for automotive USB chargers. In 2017 IEEE Applied Power Electronics Conference and Exposition, APEC 2017 (pp. 2146-2149). [7930996] Institute of Electrical and Electronics Engineers Inc.. DOI: 10.1109/APEC.2017.7930996

A 10MHz, 40V-to-5V clock-synchronized AOT hysteretic converter with programmable soft start technique for automotive USB chargers. / Ke, Xugang; Wei, Kang; Ma, D. Brian.

2017 IEEE Applied Power Electronics Conference and Exposition, APEC 2017. Institute of Electrical and Electronics Engineers Inc., 2017. p. 2146-2149 7930996.

Research output: ResearchConference contribution

Ke, X, Wei, K & Ma, DB 2017, A 10MHz, 40V-to-5V clock-synchronized AOT hysteretic converter with programmable soft start technique for automotive USB chargers. in 2017 IEEE Applied Power Electronics Conference and Exposition, APEC 2017., 7930996, Institute of Electrical and Electronics Engineers Inc., pp. 2146-2149, 32nd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2017, Tampa, United States, 3/26/17. DOI: 10.1109/APEC.2017.7930996
Ke X, Wei K, Ma DB. A 10MHz, 40V-to-5V clock-synchronized AOT hysteretic converter with programmable soft start technique for automotive USB chargers. In 2017 IEEE Applied Power Electronics Conference and Exposition, APEC 2017. Institute of Electrical and Electronics Engineers Inc.2017. p. 2146-2149. 7930996. Available from, DOI: 10.1109/APEC.2017.7930996
Ke, Xugang ; Wei, Kang ; Ma, D. Brian. / A 10MHz, 40V-to-5V clock-synchronized AOT hysteretic converter with programmable soft start technique for automotive USB chargers. 2017 IEEE Applied Power Electronics Conference and Exposition, APEC 2017. Institute of Electrical and Electronics Engineers Inc., 2017. pp. 2146-2149
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