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首页> 外文会议>IEEE International Solid- State Circuits Conference >17.9 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
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17.9 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

机译：17.9高转换比率和97.4％的峰值效率3-Switch升压转换器，具有占空比的电荷拓扑，用于1.2A高驱动电流和MiniLate应用中的电感器DC电流的20％降低

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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 $=mathrm{V}_{mathrm{OUT}}/mathrm{V}_{mathrm{I}mathrm{N}}$) is 5. Since the inductor current $I_{L}=I_{LOAD}/(1-D)$ of the conventional 2-switch (2S) boost converter is high, where $mathrm{I}_{mathrm{LO}mathrm{A}mathrm{D}}$ is the load current and D is the duty cycle, 2S boost converters have low efficiency and high output voltage ripple. Although 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 $arphi$ 2. ln case of high CR, the duration of $arphi$ 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$$ [1] and [2] fail to have CR=5 at load current =1.2A. Although additional dual channel-interleaved three-level buck-boost (DTLBB) structure in [1] can alternatively charge two flying capacitors, the hardware overhead is double and the quiescent current becomes high.
机译：今天的MINILED显示器可以分为多个阵列。每个具有900像素的阵列都有60个通道，其中每个通道具有15个LED串联连接。从低输入电压$ mathrm {v} _ { mathrm {i} mathrm {n} $（= 6V），驱动多通道致力于，升压转换器，高输出电压（最多30V）需要高输出电流（最多1.2A，2000个nITs），其中转换比（CR $ = mathrm {v} _ { mathrm {out}} / mathrm {v} _ { mathrm {i} mathrm {n}} $）是5.由于传统的2-switch（2s）升压转换器的电感器电流$ i_ {l} = i_ {load} /（1-d）$。$ mathrm {i} _ { mathrm {lo} mathrm {a} mathrm {d mathrm {d}} $是负载电流和d是占空比，2s升压转换器具有低效率和高输出电压纹波。虽然升压转换器由串联飞行电容器$ mathrm {c} _ { mathrm {f}} $可以降低电感器电流级别以提高效率[1] - [5]，$ mathrm {c} _ { Mathrm {f}} $缺乏高CR和高负载条件下的能量。在图17.9.1的顶部，[1]和[2]中的两种技术充电$ mathrm {c} _ { mathrm {f}} $期间$ varphi $ 2. ln的高cr案例， $ varphi $ 2的持续时间变小，以严重影响充电时间。因此，由于$ mathrm {c} _ { mathrm {f}} $中存储的电荷不足，驱动能力将减小。在没有负载（图17.9.2的左侧），[1]未能调节，D为0.87在[2]到HAVECR = 5。 LNTERESTICLY，在负载电流= 1.2a时，$$ [1]和[2]都不能具有CR = 5。虽然[1]中的附加双通道交错的三级降压 - 升压（DTLBB）结构可以替代地为两个飞行电容器充电，但硬件开销是双倍，静态电流变高。

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