Paralleling Interface for power supply

摘要

An interface to connect in parallel two or more digitally controlled AC power supplies. The paralleling interface is based on a master-slave scheme, and includes up to 10 electrical signals. Each signal contributes to achieve transparent operation of the paralleled units, making it perform as if it was a single unit with increased power/current capability.

主权项

1. An electronic mixed-signal interface to connect two or more three phase AC power supplies in parallel with one of them acting as a master and one or more acting as slaves comprising:
a. three digital serial buses, one per phase, used by a master unit to send real-time data from a control loop to a plurality of slave units; b. three analog signal buses where all units add a small-signal current proportional to their output current, used by all real-time control loops as feedback, feedforward and/or monitoring; c. a digital serial communication interface, used for non-real-time data transmission such as configuration or monitoring; d. the master generating one synchronization signal that is used by a plurality of nodes to synchronize digital control sampling time and/or power stage switching; e. any node capable of generating a global fault logic signal in case of a fault in the power stage, and which causes an immediate shut down of all other power stages; and f. all units sharing a daisy chain signal which automatically detects the position of the unit in the system, enables bus termination resistors, and determines which unit is the default master.