A High-Conversion-Ratio and 97.4% Peak-Efficiency 3-Switch Boost Converter with Duty-Dependent Charge Topology for 1.2A High Driving Current and 20% Reduction of Inductor DC Current in MiniLED Applications

Yen An Lin, Si Yi Li, Zheng Lun Huang, Chong Sin Huang, Chin Hsiang Liang, Kai Syun Chang, Kai Cheng Chung, Ke Horng Chen, Ying Hsi Lin, Shian Ru Lin, Tsung Yen Tsai

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Today's miniLED displays can be divided into multiple arrays. Each miniLED array with 900 pixels can have 60 channels where each channel has 15 LEDs connected in series. To drive multi-channel miniLEDs in parallel from a low input voltage \mathrm{V}_{\mathrm{I}\mathrm{N}}(=6V), a boost converter with high output voltage (up to 30V) and high output current (up to 1. 2A for 2000 nits) is required where the conversion ratio (CR =\mathrm{V}_{0\cup \mathrm{T}}/\mathrm{V}_{\mathrm{I}\mathrm{N}}) is 5. Since the inductor current I_{L}=I_{LOAD}/(1-D) of the conventional 2-switch (2S) boost converter is high, where \mathrm{I}_{\mathrm{L}0\mathrm{A}\mathrm{D}} is the load current and D is the duty cycle, 2S boost converters have low efficiency and high output voltage ripple. AIthough the boost converter assisted by a series flying capacitor \mathrm{C}_{\mathrm{F}} can reduce the inductor current level to improve efficiency [1] -[5], \mathrm{C}_{\mathrm{F}} lacks energy under high CR and high loading conditions. At the top of Fig. 17.9.1, both techniques in [1] and [2] charge the \mathrm{C}_{\mathrm{F}} during \varphi 2. ln case of high CR, the duration of \varphi 2 becomes small to seriously affect the charging time. Hence, due to insufficient charge stored in \mathrm{C}_{\mathrm{F}}, the driving capability will decrease. At no load (left of Fig. 17.9.2), [1] fails to regulate and D is 0.87 in [2] to haveCR=5. lnterestingly, both [1] and [2] fail to have CR=5 at load current =1.2A. AIthough additional dual channel-interleaved three-level buck-boost (DTLBB) structure in [1] can alternatively charge two flying capacitors, the hardware overhead is double and the quiescent current becomes high.

Original languageEnglish
Title of host publication2021 IEEE International Solid-State Circuits Conference, ISSCC 2021 - Digest of Technical Papers
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages272-274
Number of pages3
ISBN (Electronic)9781728195490
DOIs
StatePublished - 13 Feb 2021
Event2021 IEEE International Solid-State Circuits Conference, ISSCC 2021 - San Francisco, United States
Duration: 13 Feb 202122 Feb 2021

Publication series

NameDigest of Technical Papers - IEEE International Solid-State Circuits Conference
Volume64
ISSN (Print)0193-6530

Conference

Conference2021 IEEE International Solid-State Circuits Conference, ISSCC 2021
CountryUnited States
CitySan Francisco
Period13/02/2122/02/21

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