Patent ID: 6700802
Filing Date: 2004-03-02
Classification: H02J,H02M

Abstract:
A system comprising:a bi-directional circuit coupled between a first source in the form of a DC power storage source and a second source in the form of a power bus, said circuit capable of transitioning between a first direction wherein electrical power flows from the first source to the second source and a second direction wherein electrical power flows from the second source to the first source; and a control subsystem coupled to said bi-directional circuit to generate control signals to selectively activate switching elements of said circuit to control the direction and the amount of electrical power flowing through said circuit between said first and second sources, wherein the control subsystem is capable of controlling the direction and the amount of electrical power flowing through the bi-directional circuit such that, when the bi-directional circuit transitions from one direction to the other direction, electrical power flowing in one direction between the first and second sources will drop until electrical power flow reaches zero and then electrical power will start to flow in the other direction and increase until desired electrical power flow has been reached, the control subsystem including a processor to determine pulse width and timing of control signals to be applied to the switching elements of said circuit to maintain a voltage level of the power bus within a desired range, and a signal generator coupled to said processor to generate control signals according to the pulse width and timing parameters determined by said processor, wherein said processor uses a feed forward component to estimate pulse widths of control signals to maintain the voltage level of the power bus within the desired range.