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A method and apparatus for load leveling of a battery in an electrical power system includes a power regulator coupled to transfer power between a load and a DC link, a battery coupled to the DC link through a first DC-to-DC converter and an auxiliary passive energy storage device coupled to the DC

A method and apparatus for load leveling of a battery in an electrical power system includes a power regulator coupled to transfer power between a load and a DC link, a battery coupled to the DC link through a first DC-to-DC converter and an auxiliary passive energy storage device coupled to the DC link through a second DC-to-DC converter. The battery is coupled to the passive energy storage device through a unidirectional conducting device whereby the battery can supply power to the DC link through each of the first and second converters when battery voltage exceeds voltage on the passive storage device. When the load comprises a motor capable of operating in a regenerative mode, the converters are adapted for transferring power to the battery and passive storage device. In this form, resistance can be coupled in circuit with the second DC-to-DC converter to dissipate excess regenerative power.

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[ What is claimed is:] [1.] A battery load leveling arrangement for an electrically powered system in which battery loading is subject to intermittent high current loading, the system including a battery coupled to supply electric power to a DC link, a load, and a system controller coupled in circui

[ What is claimed is:] [1.] A battery load leveling arrangement for an electrically powered system in which battery loading is subject to intermittent high current loading, the system including a battery coupled to supply electric power to a DC link, a load, and a system controller coupled in circuit between the DC link and load for controlling application of power to the load, said battery load leveling arrangement comprising:a passive energy storage device;a first bidirectional converter coupled in circuit with the passive energy storage device and the DC link for transferring electrical power between the DC link and the energy storage device;a second bidirectional converter coupled in circuit between the battery and the DC link for transferring electrical power between the battery and DC link; andunidirectional conducting means coupling the battery to the energy storage device and poled to conduct conventional current from the battery to the energy storage device whereby battery current can be coupled to the DC link through each of the first and second converters when battery terminal voltage is greater than voltage on said passive energy storage device by an amount at least equal to a voltage drop across said unidirectional conducting means.