| 摘要 |
In a switching type DC to AC power converter a plurality (A-D, FIG. 6) of pairs of switchers (S1 and S2) are connected through inductors (LA-LD) to a load. Each set of switchers is switched to produce a square wave shaped output voltage (FIGS. 5A-5D) at a switch frequency (fS) and at a modulation percentage to produce an output voltage (EO) to a load, at a selected frequency. The sets are switched at phased delays, so that the ripple currents through them, when summed up, result in a ripple current IT at a frequency fC, where fC=nxfS, n being the number of pairs of switchers. In another aspect of the invention, means are incorporated to prevent the flow of currents between parallel connected amplifiers, characterized by zero output impedances.
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