Digital Design of 12-Phase Cycloconverter Based on DSP with CPLD

Recently, analog control is replaced by digital control in cycloconverter-fed adjustable speed drives. However, cycloconverter has many thyristors and control signals. Multi-CPU has to be adopted for its complexity. In this paper, main circuit is redesigned due to multi-phase. An interstar winding m...

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Bibliographic Details
Main Authors: He Bi, Zhang Xiaofeng, Lin Hua, Zhou Yunbin, Ma Lei
Format: Conference Proceeding
Language:English
Subjects:
Circuits
Digital control
Digital signal processing
Power supplies
Power transformer insulation
Pulse generation
Pulse transformers
Signal design
Thyristors
Variable speed drives
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Summary:Recently, analog control is replaced by digital control in cycloconverter-fed adjustable speed drives. However, cycloconverter has many thyristors and control signals. Multi-CPU has to be adopted for its complexity. In this paper, main circuit is redesigned due to multi-phase. An interstar winding method is used in insulating transformers to supply 12-phase power. A 12-phase cycloconverter based on DSP with CPLD is proposed. The inner structure of CPLD is designed especially to generate heavy firing pulses composed of control signal distributor, counting time delay and pulses widening, and pulses distribution parts. Simulation and experiment results denote that a digital cycloconverter based on DSP with CPLD has the convenience of design and debugging, and has preferable control performance and high reliability
DOI:10.1109/ICIEA.2006.257092