Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1998-02-12
1999-12-28
Nguyen, Matthew
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
H02M 744
Patent
active
060090073
ABSTRACT:
Apparatus for controlling pulse density is disclosed herein. The aforementioned apparatus including the following devices: A comparator that is used to compare an input reference voltage and a feedback voltage signal. A math processing device that is used to add the difference between the feedback voltage signal and an analog duty command signal to the analog duty command signal. A shift register that is used to generate a shift timing signal. A weighted averaging device that is used to carry out the operation of the weighted averaging of the feedback voltage signal according to the shift timing signal. A sequential switching device that is used to generate a switch-timing control signal by decoding the feedback voltage signal. A rectifying device that is used to output power with zero-current-switching. The rectifying means is driven by the switch-timing control signal.
REFERENCES:
patent: 4236213 (1980-11-01), Richardson
patent: 4700285 (1987-10-01), Szepsi
patent: 5329439 (1994-07-01), Porojevic et al.
patent: 5442540 (1995-08-01), Hua et al.
"Pulse-Density-Modulated Power Control of a 4 kW, 450 kHz Voltage-Source Inverter for Induction Melting Applications", H. Fujita et al., IEEE Transactions on Industry Applications, vol. 32, No. 2, Mar./Apr. 1996.
Industrial Technology Research Institute
Nguyen Matthew
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