Novel tracking power supply for linear power amplifiers

被引：40

作者：

Gong, Guanghai ^{[1
]}

Ertl, Hans ^{[2
]}

Kolar, Johann W. ^{[1
]}

机构：

[1] ETH, Power Elect Syst Lab, CH-8092 Zurich, Switzerland

[2] Vienna Univ Technol, Power Elect Sect, A-1040 Vienna, Austria

来源：

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS | 2008年 / 55卷 / 02期

关键词：

linear power amplifier (LPA); supply voltage conditioning; testing power supply; tracking power supply (TPS); PWM RECTIFIER; DESIGN;

D O I：

10.1109/TIE.2007.896152

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

Conventional linear power amplifiers (LPAs) show a high output voltage quality but are characterized by high power losses and/or low power density. Therefore, there is a growing interest in increasing the efficiency of LPAs, e.g., for the realization of high power testing voltage sources. In this paper, a high-frequency isolated boost-type tracking power supply (TPS) system is proposed for the conditioning of the input voltage of an LPA. The output voltage of the TPS is varied according to the voltage to be formed by the LPA so that the voltage drop across the power amplifier output transistors is reduced to low values. This results in a significant increase of the total system efficiency. The operating principle of the proposed,system is described. A design method for the output filter using the power supply rejection ratio of the LPA is proposed. This method ensures that the amplifier output voltage has minimal switching frequency components. Furthermore, a control system design method, is presented that ensures good performance in the control of the constant inductor current of the switch-mode tracking stage. Finally,. the theoretical considerations are verified by measurements on a 1-kW laboratory prototype.

引用

页码：684 / 698

页数：15

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