H - Electricity – 02 – M
Patent
H - Electricity
02
M
H02M 5/458 (2006.01) H02J 7/14 (2006.01) H02P 9/30 (2006.01)
Patent
CA 2066427
A three phase alternator (10) is driven by a variable speed prime mover (16), and its rectified out- put VQ is pulse width modulated by a gate controlled H- bridge power switch circuit (60). Predetermined pairs of power switches (Q1, Q2, Q3, Q4) are gated on and off according to programmed duration and timing instructions contained in a read only memory (78). A sine wave out- put is produced by successive pulse trains (A, B). The first pulse train (A) has alternating positive and nega- tive constant amplitude pulses, with the widths of posi- tive pulses varying sinusoidally and the widths of negative pulses being constant. The second pulse train (B) has alternating positive and negative pulses of con- stant amplitude, with the pulse widths of the negative pulse components varying sinusoidally, and the pulse widths of the positive components being constant. The components of the first and second pulse trains have an energy distribution which corresponds to one cycle of a sine wave having a fixed frequency.
Davis Donald Edgar
Moffat & Co.
LandOfFree
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