一种开关线性复合包络线跟踪电源的控制策略

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Abstract In the third generation (3G) mobile telecommunication system, the input signal to the radio frequency power amplifier (RFPA) characterizes of non-constant envelope with high bandwidth. Under this condition, constant amplitude power supply to the RFPA will lead to significant power loss. To improve the efficiency of the systems, one of the most promising methods is the envelope tracking technique, which is based on using a high efficiency power supply to provide a varying voltage to the RFPA that tracks the envelope of the transmitted signal. Thus, the RFPA can operate near its theoretical maximum efficiency. For this purpose, this paper adopts a linear amplifier and a switched-mode converter connected in parallel at the output to construct the envelope tracking power supply. The linear amplifier stage features of wide bandwidth and it makes the output voltage follow the envelope of the transmitted signal, and the switched-mode converter features of high efficiency and it provides most of the load current. A PWM current control strategy with constant switching frequency is proposed for the switched-mode converter, and it is further improved by feed-forwarding the output voltage to reduce the current of the linear amplifier, leading to a higher efficiency. The effectiveness of the proposed structure and control strategies are verified by the experimental results from a prototype tracking 100kHz sinusoidal signal.

Key words： 3G communication system envelope tracking technique AB-type linear amplifier synchronous Buck converter control strategy

Received: 04 January 2010 Published: 20 March 2014

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TM464

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	Xiong Xiaoling
	Xi Huan
	Ruan Xinbo

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Xiong Xiaoling,Xi Huan,Ruan Xinbo. A Control Strategy for Switch-Linear Hybrid Envelope Tracking Power Supply[J]. Transactions of China Electrotechnical Society, 2012, 27(8): 101-107.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2012/V27/I8/101

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