H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/29
H02M 3/335 (2006.01) H02M 3/337 (2006.01)
Patent
CA 1094635
MASTER-SLAVE VOLTAGE REGULATOR EMPLOYING PULSE WIDTH MODULATION Abstract of the Disclosure A pulse width modulation (PWM) converter circuit for transforming a first DC voltage into a second voltage (AC or DC), wherein the magnitude of the second voltage is regulated by the converter circuit. The converter circuit comprises a clock circuit, a master pulse width modulator (PWM) circuit and n slave pulse width modulator (PWM) circuits. The clock circuit provides a symmetrical train of rectangular pulses on each of n+l conductors, wherein only one pulse occurs on any one of the conductors at one time. The master PWM means is responsive both to the train of pulses on one of the n+l conductors and to a feedback signal indicative of the magnitude of the second voltage; the master PWM means controls the flow of current, due to the first DC voltage, through a portion of a transformer primary winding. Each of the slave PWM circuits is responsive both to the train of pulses on n of the n+l conductors, in a one-to-one relationship, and to an output control signal based both upon the feedback signal, indicative of the magnitude of the second voltage, and upon the difference in the magnitude of the charge passed by the master PWM circuit and the charge passed by the respective slave PWM circuits, each of the slave PWM circuits controls the flow of current, due to the first DC voltage, through a portion of the transformer primary winding. - i -
295097
Hogeboom Robert C.
Northern Telecom Limited
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