Energy Storage for Power Factor Correction in Battery Charger for Electric-Powered Vehicles

摘要

Switches of a switching circuit used to control operation of an electric motor such as in an electrically powered vehicle connect respective windings of the electric motor as a single phase inductor during battery charging. The inductor can then store inherent low frequency, second order ripple power and return that power to a load presented by a battery during battery charging to deliver substantially constant current. Storage of ripple power in the inductor allows the capacitance value, size, weight and cost of a filter capacitor of a power factor correction circuit providing input power to a battery charger to be reduced by an order of magnitude or more. Direction of current flow through the inductor is periodically reversed to avoid magnetizing the motor.

主权项

1. A method of supplying power to a device, wherein said device includes an inductor, said method comprising steps of:
supplying power to a power factor correction circuit, connecting an output of said power factor correction circuit to a power converter, connecting an output of said power converter to a load, and storing ripple power of said output of said power factor correction circuit in said inductor of said device.