Abstract: A modular arrangement of DC to DC Power conversion units which permits variation of power handling capability without changing the power control system. The conversion units of the stagger-mode type including two pulse width modulated converter sub-units are separated into two individually powered and controlled units. First units of all converters are connected in one series string across a power source and similarly the second units of all converters are connected in a second series string across the power source. Each unit has a capacitor connected across its power input terminals so that the source voltage is evenly divided between converters. With this configuration only one converter need have its current monitored in order to balance the current between the two strings of converter units. The system includes current and voltage protection features appropriate to a high current and high voltage environment.

Abstract: The DC to DC voltage converter consists of two single ended pulse width modulated converters with a single voltage control loop, a power balancing control loop and overload protection circuitry. The converters which share the same input and output filters are staggered in time so as to reduce the pulse current in the input filter capacitor and the ripple current in the output filter capacitor thereby permitting a reduction in the size of the input and output filters.