| 摘要 |
A method and structure for electric power management that economically satisfies peak power demand and immediately satisfies a sudden substantial increase in power demand. An electric power management system comprises a first circuit element in parallel with a second circuit element, and a load in parallel with the first circuit element. The first circuit element includes a first direct current (DC) energy source in series with a first diode that prevents current backflow into the first energy source. The first energy source may comprise a conventional energy source such as fossil fuel, natural gas, hydroelectric power, etc. Alternatively, the first energy source may comprise an alternative energy source such as, inter alia, fuel cells, solar cells, wind power, and biomass power. The second circuit element includes a second DC energy source in series with a second diode that prevents current backflow into the second energy source, wherein said current backflow could be high enough to damage the second energy source. The second energy source, such as a battery, can respond instantaneously to a sudden demand in power. When the open circuit voltage (V20) of the second energy source is less than the terminal voltage (V1) of the first energy source, the first energy source alone supplies power to the load. When V20>=V1, the first energy source and the second energy source collectively supply power to the load. The preceding relationships between V20 and V1 hold during both steady state and transient operation of the electric power management system.
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