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| Electric vehicles may have more than one source of DC power to deliver to the motor as AC. This is true of fuel-cell and battery-equipped machines, hybrid (engine + battery), or other forms of power storage that may be devised in the future. The Direct Electric Power Converter (D-EPC) is a semiconductor switching circuit that can add multiple DC-input voltages. It is similar to a matrix converter, except for replacing an AC input with multiple DC inputs. During every pulse-width-modulation (PWM) cycle, the D-EPC alternately activates one of the multiple inverter circuits, which are connected to the power sources. The D-EPC has been proven experimentally to distribute power between two DC power sources having different voltages; further, it has been shown to conduct charging operations between two power sources. Typically, when multiple power sources have different DC voltages, a DC-DC converter is used; however, the typical configuration causes power conversion losses. The D-EPC controls power distribution among multiple DC power sources without using a DC-DC converter. The technology includes a method of power distribution on the basis of an output voltage allotment rule, as well as a method for generating the modulation factor to achieve voltage command values and a PWM pulse generation technique to operate switches.Generally fuel cell vehicles (FCVs) stack generator battery charge regenerated power Typically DC-DC converter control charging/discharging combine two sources voltages |
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