Patent ID: 9024609
Filing Date: 2015-05-05
Classification: H02J,H02M

Abstract:
1. A power conversion system comprising: a first power converter having an input side coupled across first and second input voltage terminals to receive an input voltage thereby, the first power converter effective during a normal operating condition when said input voltage is less than a first threshold voltage to step up the input voltage to a first output voltage of at least the first threshold voltage and provide said first output voltage across first and second output terminals; a second power converter coupled to the first and second output terminals and having an input voltage range comprising a maximum input voltage greater than the first output voltage and a minimum input voltage less than the first threshold voltage; an auxiliary circuit coupled to the first and second output terminals in parallel with the first power converter, the auxiliary circuit comprising an energy storage device, an auxiliary energy source, and a voltage clamping circuit coupled between the auxiliary energy source and the energy storage device, the auxiliary circuit effective to regulate the amount of energy from the auxiliary source charged in the energy storage device to a second threshold voltage less than the maximum input voltage of the second power converter; wherein a discharge time of the energy storage device from the second threshold voltage to the minimum input voltage of the second power converter exceeds a predetermined hold-up time; and the auxiliary circuit is effective during a hold-up time operating condition wherein the input voltage to the first power converter is removed to discharge from the energy storage device to the second power converter a second output voltage greater than the minimum operating voltage of the second power converter for at least the predetermined hold up time.