Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1987-10-19
1988-08-16
Wong, Peter S.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
219216, 346 76PH, G01D 1510, H02P 1324
Patent
active
047648589
ABSTRACT:
A circuit for delivering a predetermined amount of energy to a load without regulating the voltage across the load is described. An a.c. or rectified sine wave is controlled. There is no capacitive smoothing of the applied voltage. A time counter is activated at the beginning of each half cycle of the sine wave. At a predetermined point in time, a switch is closed and power is delivered to the load. At another predetermined time in the same half cycle, the actual applied voltage is measured. The detected voltage value and corresponding time of measurement comprise a unique signature enabling identification of the specific sine function for that half cycle. The sine function signature permits calculation of either the amount of total energy delivered or the RMS voltage level as a function of progressing time, and thus, determination of the time period for which the line switch must remain closed in order to deliver the predetermined amount of total energy, or to maintain a predetermined RMS voltage. When the time counter reaches the computed necessary time period, the switch opens and power delivery is stopped.
REFERENCES:
patent: 3979661 (1976-09-01), Matz
patent: 4119907 (1978-10-01), Quinn
patent: 4594501 (1986-06-01), Culley et al.
patent: 4684959 (1987-08-01), Mori et al.
patent: 4704618 (1987-11-01), Gotoh et al.
Gulton Industries Inc.
Wong Peter S.
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