基于双模式调制的低纹波Buck型发光二极管驱动电源

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摘要针对大功率发光二极管（LED）驱动电源全负载范围内难以兼顾高效率与低电流纹波的矛盾,本文提出基于脉冲宽度调制（PWM）/脉冲频率调制（PFM）双模式切换的数字控制方法。该方法通过工况自适应切换与纹波理论优化相结合以提升性能：重载时采用PWM配合同步整流,以降低导通损耗;轻载时自动切换至恒定导通时间（COT）PFM模式,通过降低开关频率减少开关损耗。为实现轻载下效率与纹波的协同优化,本文建立反映纹波与效率耦合关系的峰值电流优化模型,揭示纹波幅值与开关频率的内在权衡关系,并据此提出以满足纹波约束为目标的最优峰值电流参数设计步骤。70 W样机实验表明,输入电压24 V、负载电流100 mA~4.8 A全范围内,输出电流纹波始终不超过15 mA,轻载开关频率最低降至23 kHz,效率较传统单一PWM模式提升20个百分点以上且电流纹波不超过2 mA,有效实现了高效率与低纹波协同优化,验证了所提方法的有效性。

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	刘宇桐
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关键词 ：大功率发光二极管（LED）驱动电源, Buck变换器, 脉冲宽度调制（PWM）/脉冲频率调制（PFM）双模式切换, 纹波优化

Abstract：Aiming at the contradiction in high-power light-emitting diode (LED) driving power supplies: it is hard to balance high efficiency and low current ripple over the full load range. This paper proposes a digital control method based on pulse width modulation (PWM)/pulse frequency modulation (PFM) dual-mode switching. It also establishes a peak current optimization model that considers the ripple-efficiency coupling relationship. This model suppresses light-load current ripple. Under heavy-load conditions, the research adopts PWM combined with synchronous rectification. This measure reduces conduction losses. Under light-load conditions, the system switches to constant on-time (COT) PFM mode. It reduces switching frequency to lower switching losses, thereby improving light-load efficiency. In terms of ripple optimization, the study establishes a mathematical model of voltage ripple and inductor peak current under light-load conditions. The model reveals the coupling mechanism between ripple amplitude and switching frequency. It also derives the optimal peak current that meets ripple constraints. Experiments are conducted on a 70 W prototype. The results show that with an input voltage of 24 V and a load current range of 100 mA to 4.8 A, the output current ripple is always on more than 15 mA. Under light loads, the switching frequency drops to a minimum of 23 kHz. Efficiency increases by more than 20 percentage points compared with the traditional PWM, and the current ripple is on more than 2 mA. The proposed method effectively achieves the coordinated optimization of high efficiency and low ripple, which verifies its effectiveness.

Key words： high-power light-emitting diode (LED) driving power supply Buck converter pulse width modulation (PWM)/pulse frequency modulation (PFM) dual-mode switching ripple optimization

收稿日期: 2026-01-23

作者简介: 刘宇桐（1995—）,男,硕士,研究实习员,主要研究方向为电力电子技术、信号处理等。

引用本文:

刘宇桐, 隋延林, 王鹏程, 张亮亮. 基于双模式调制的低纹波Buck型发光二极管驱动电源[J]. 电气技术, 2026, 27(7): 9-16. LIU Yutong, SUI Yanlin, WANG Pengcheng, ZHANG Liangliang. Low-ripple Buck light-emitting diode driving power supply based on dual-mode modulation. Electrical Engineering, 2026, 27(7): 9-16.

链接本文:

https://dqjs.cesmedia.cn/CN/Y2026/V27/I7/9

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