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A SINGLE-CHIP MICROCOMPUTER-BASED ADAPTIVE CURRENT CONTROLLER FOR A THREE-PHASE BRIDGE
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| Author(s) |
Geza Joos; Louis Dessaint; Jude Levasseur; Hoang Le-Huy |
| Abstract |
This paper describes the realisation of a current controller for a phase-controlled converter with special provision for the discontinuous current mode. It has been previously demonstrated that in the discontinuous current mode, the equivalent commutating resistance of the converter increases and becomes more and more important as the conduction angle becomes smaller [1]. This means that the electric time constant decreases as well as the converter voltage gain. In order to maintain the same time response of the current regulator, the integral term of the PI compensator is made variable in tbe discontinuous current mode. The proposed controller with adaptive adjustement of the integral gain bas been implemented on a single-chip microcomputer. The microcontroller is well suited for this application specially because of its on-board 16 bit timer used for the measurement of the conduction angle. The look-up table containing tbe values of the adaptive gain is conveniently stored in the on-package EPROM memory. With this scheme identical time response can be obtained in both continuous and discontinuous mode. |
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| Filesize: | 2.032 MB |
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| Type |
Members Only |
| Date |
Last modified 2021-02-04 by System |
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