考虑运算放大器带宽限制包络线跟踪电源的前馈控制策略

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Abstract In order to improve the power supply efficiency to power amplifier in 3G communication system, an envelope tracking power supply, consists of a multilevel converter in series connected with a linear power supply, is proposed. This scheme can operate the switches in same frequency with the reference signal, so as to gain better tracking bandwidth compared to existing general schemes. In basic control method for envelop tracking power supply, the closed loop can not suppress the disturbance effectively. To address the problem, the feed-forwarding the step-wave voltage control strategy is proposed. For practical implementation, the thesis proposes the frequency compensation scheme of cascaded operational amplifiers to extend the equivalent bandwidth; and the high-frequency spike suppression scheme to match the transfer functions of the two branches between step-wave voltage and output port, so as to eliminate the disturbance effect to the output voltage. A prototype for 300kHz sine wave tracking, with 10～32V output voltage and 50W peak output power is built. The experimental results validate the schemes proposed.

Key words： 3G communication power amplifier envelope tracking high bandwidth frequency compensation

Received: 23 August 2012 Published: 27 June 2014

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TM46

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	Xi Huan
	Jin Qian
	Ruan Xinbo

Cite this article:

Xi Huan,Jin Qian,Ruan Xinbo. Feed-Forward Control Strategy for Envelope Tracking Power Supply Considering Bandwidth Limitation of Operational Amplifiers[J]. Transactions of China Electrotechnical Society, 2014, 29(4): 142-151.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I4/142

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