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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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

Received: 23 January 2026

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	Articles by authors
	LIU Yutong
	SUI Yanlin
	WANG Pengcheng
	ZHANG Liangliang

Cite this article:

LIU Yutong,SUI Yanlin,WANG Pengcheng等. Low-ripple Buck light-emitting diode driving power supply based on dual-mode modulation[J]. Electrical Engineering, 2026, 27(7): 9-16.

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

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