Current control of a PWM power amplifier by an approximate 2-degree-of-freedom digital controller |
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Authors: | Keisuke Fujita Kohji Higuchi Kazushi Nakano Koji Matsushita Tatsuyoshi Kajikawa Fumiho Chino |
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Affiliation: | 1. Department of Electronic Engineering, University of Electro-Communications, 1-5-1 Chofu-ga-oka, Chofu, Tokyo, 182-8585, Japan 2. NF Corporation, Yokohama, Japan
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Abstract: | There is a need for robust current control of a pulse width modulation (PWM) power amplifier whose transient response characteristics
do not deteriorate with extensive load changes and/or direct-current power supply voltage changes. In this article, we propose
a digital robust controller with bumpless mode switching to control the current of a PWM power amplifier to satisfy the demands
and extend the range of an inductive load width. It is necessary to measure the value of the load in order to implement this
bumpless mode switching automatically depending on the load range. Therefore, a method of estimating the inductive load is
shown. The bumpless mode switching is automatically performed by estimating an inductive value without specifying the value
of the inductive load beforehand. That is, the value of the inductive load is estimated during the DDC execution, and the
control mode is automatically switched bumplessly according to this estimated value. A digital controller equipped with inductance
estimation and bumpless mode switching is realized by a DSP. Some experiments show that the digital controller with the proposed
bumpless mode switching can satisfy larger specifications. |
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