Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1994-10-26
1996-03-12
Wong, Peter S.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 97, 363131, 323283, H05B 668
Patent
active
054991773
ABSTRACT:
An inverter device with a circuit for generating pulse width modulation (PWM) signal is formed of an inverter section and a circuit. The circuit includes an U/D counter 4 for regulating a control cycle of a PWM waveform, a register 1C for storing on-timing information of the PWM waveform, and a register 1D for storing off-timing information of the PWM waveform. The circuit is actuated by one of first and second modes. In the first mode, the PWM waveform is outputted by comparing an output of the counter 4 with the respective outputs of the registers 1C, 1D. In the second mode, the counter 4 counts down a signal, and after reaching zero, the counter counts up again, which is made within one cycle and is compared with only the output of the register 1C to output the PWM waveform. In the second mode, the reset level is not calculated, so that load to CPU is relieved, and the carrier cycle is shortened.
REFERENCES:
patent: 4931609 (1990-06-01), Aoki
patent: 4994950 (1991-02-01), Gritter
patent: 5404089 (1995-04-01), Flanagan et al.
Fuji Electric & Co., Ltd.
Krishnan Aditya
Wong Peter S.
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