恒定导通时间控制Buck变换器的间隔周期斜率补偿方案

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Abstract A novel adaptive ramp compensation scheme is proposed to improve stability for Buck converters with ripple-based constant on-time control. Compared with traditional compensation approaches, the new method eliminates sub-harmonic oscillation more effectively by using digital control approach to generate "every other cycle" ramp compensation signal. Furthermore, the slope of ramp compensation is adaptively adjusted according to the off-time difference between two consecutive cycles. These features minimize the required ramp amplitude at steady state and effectively avoid over-compensation, and thus, reduce the impact on transient response performance of constant on-time control. Theoretical analysis and experimental results are provided to verify the proposed scheme.

Key words： Constant on-time control digital control Buck converters sub-harmonic oscillation adaptive ramp compensation

Received: 16 May 2016 Published: 01 March 2017

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TM46

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	Xu Yang
	Qian Ting

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Xu Yang,Qian Ting. Every Other Cycle Ramp Compensation for Buck Converters with Constant On-Time Control[J]. Transactions of China Electrotechnical Society, 2017, 32(4): 58-65.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I4/58

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