Buck or boost tracking power converter

IEEE Power Electronics Letters Pub Date : 2004-12-27 DOI:10.1109/LPEL.2004.840739

P. Midya;K. Haddad;M. Miller

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引用次数: 84

Abstract

A cascade of buck and boost converter is presented here. The control operates in a manner that the converter is either in buck or boost (BOB) mode on a cycle by cycle basis. It transitions between the modes seamlessly to provide a tracking power conversion function for modulating the power supply of a variable envelope radio frequency (RF) power amplifier. The control algorithm and its implementation using switched capacitor circuits is described. Simulation and measured experimental results including converter efficiency, tracking accuracy, and spectrum at the output of the RF power amplifier are provided. This control technique allows seamless transition between the buck and boost modes while tracking RF envelopes with bandwidth greater than 100 kHz, and maintaining extreme accuracy and extremely low ripple. The efficiency of this converter operating at 1.68 MHz is close to 90% over a wide range of conversion ratios. The area of the power converter is extremely small allowing this to be integrated into a cellular telephone. The controller was integrated as part of a larger power management IC as well as a discrete IC.

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降压或升压跟踪功率转换器

本文介绍了一种降压升压级联变换器。控制以转换器在逐周期的基础上处于降压或升压（BOB）模式的方式操作。它在模式之间无缝转换，以提供跟踪功率转换功能，用于调制可变包络射频（RF）功率放大器的电源。介绍了开关电容电路的控制算法及其实现。提供了模拟和测量的实验结果，包括转换器效率、跟踪精度和RF功率放大器输出处的频谱。这种控制技术允许在降压和升压模式之间无缝转换，同时跟踪带宽大于100kHz的RF包络，并保持极高的精度和极低的纹波。该转换器在1.68MHz下工作的效率在宽范围的转换比上接近90%。功率转换器的面积非常小，可以将其集成到蜂窝电话中。控制器被集成为更大的电源管理IC以及分立IC的一部分。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IEEE Power Electronics Letters

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