H - Electricity – 02 – M
Patent
H - Electricity
02
M
330/19, 321/27,
H02M 3/335 (2006.01) H02M 3/00 (2006.01) H02M 3/04 (2006.01) H03F 3/217 (2006.01) H03K 17/60 (2006.01)
Patent
CA 1141000
ABSTRACT Disclosed is a switching power amplifier of high efficiency, small size and weight and excellent dynamic performance, together with reduced pulsating for both input and output currents. Switching ripple is completely eliminated, unlike in conventional designs. The amplifier is provided by a pair of converters with feedback control of the pulse width of applied switching pulses. Each converter has two inductances, one in series with a DC power source and one in series with the load, storage capacitance, and switching means for alternately connecting the junction between the first inductance and the storage capacitance to ground return for the source, and connecting the junction between the storage capacitance and the second inductance to ground return for the load. When the input inductances of the two converters are made equal, the ripple input currents to the two converters result in zero-ripple source current. The switching means for one of the two converters is driven with the complement of the pulse- width modulated control signal applied to the other. In each converter, the input and output inductors are coupled by providing the inductors as windings of a transformer designed for the condition n = k, where n is equal to the square root of the ratio of the self-inductances of the input and output windings, and k is the coupling coefficient between the windings for zero output current ripple.
326865
California Institute Of Technology
Smart & Biggar
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