The Direct Electric Power Converter (D-EPC), a semiconductor switching circuit, controls power distribution among multiple DC power sources without using a DC-DC converter. During every pulse-width-modulation (PWM) cycle, the DEPC alternately activates one of the multiple inverter circuits, which are connected to the power sources. The converter has been proven experimentally to conduct charging operations and distribute power between two DC power sources having different voltages.
The D-EPC has common lower arms connected to both negative terminals of the power sources (fuel cell stack and battery, for example), as well as two positive terminals connected to each power source. The lower arm consists of a switch and a diode as a conventional inverter, while the upper arms are built with bi-directional switches to prevent any short circuit from occurring.
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