Name
Title | ||
|---|---|---|
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 |
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. |
Year | DOI | Venue |
|---|---|---|
2021 | 10.1109/ISSCC42613.2021.9365797 | 2021 IEEE INTERNATIONAL SOLID-STATE CIRCUITS CONFERENCE (ISSCC) |
DocType | Volume | ISSN |
Conference | 64 | 0193-6530 |
Citations | PageRank | References |
0 | 0.34 | 0 |
Authors | ||
11 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Yen-An Lin | 1 | 4 | 1.51 |
| Si-Yi Li | 2 | 0 | 0.34 |
| Zheng-Lun Huang | 3 | 0 | 0.34 |
| Chong-Sin Huang | 4 | 0 | 0.34 |
| Chin-Hsiang Liang | 5 | 0 | 0.68 |
| Kai-Syun Chang | 6 | 0 | 0.68 |
| Chung-Kai Cheng | 7 | 1 | 1.39 |
| Ke-Horng Chen | 8 | 379 | 90.04 |
| Ying-Hsi Lin | 9 | 112 | 30.84 |
| Shian-Ru Lin | 10 | 13 | 8.38 |
| Tsung-Yen Tsai | 11 | 37 | 20.41 |