Capacitive boost circuit for extending hold up time

摘要

A circuit for extending the operation of an electrical load after interruption of its power source. The circuit includes bulk capacitors charged by the power source and regulated to a predetermined voltage near their peak-voltage rating. The bulk capacitors are isolated from the power source capacitors during normal power source operation. When the power source is interrupted, the bulk capacitors are used to hold-up the load. The circuit obtains maximum hold-up time for a given physical bulk capacitor size, while also providing a consistent hold-up time over a range of power source voltages.