H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/29, 321/97
H02M 7/527 (2006.01) H02M 3/158 (2006.01) H02M 3/315 (2006.01) H02M 7/797 (2006.01)
Patent
CA 2025364
ELECTRICAL POWER CONVERSION CIRCUIT ABSTRACT OF THE DISCLOSURE An electrical power conversion circuit having a readily varied conversion ratio and accommodating bidirectional energy flows is disclosed. The converter employs a series connected and a shunt connected semiconductor switch which may be either unidirectional or bidirectional (depending upon whether AC/DC or DC only operation is sought) and an inductor. The switches are insulated gate voltage controlled devices with charge storing capacity present at the gate. The switches are operated from a variable duty cycle rect- angular pulse which is differentiated at the leading and trailing edges to form two pairs of oppositely sensed short duration pulses. The two pairs of short duration pulses are then coupled by a transformer having two matched but oppositely sensed secondaries to the gate circuits of the two semiconductor switches. A Zener diode in each gate circuit preserves the charge stored at each gate resulting from the first positive pulse of the pair, and allows the semiconductor gate capacity to discharge as the following negative pulse appears. The circuit thus reconstitutes the original rectangular waveform in two mutually inverted forms at the gates of the two semiconductor switches to achieve the required alternate switching states with high accuracy and with a minimum of components. The AC/DC or DC only circuit is reduced in size and weight by a factor of 10 from that of a conventional AC only adjustable autotransformer.
Company General Electric
Craig Wilson And Company
Peterson William A.
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