Patent ID: 9112375
Filing Date: 2015-08-18
Classification: H02J

Abstract:
1. A power supply system for supplying back-up power to a load, where the load is powered by power from an alternating current (AC) power source, the power supply system comprising: a flywheel system comprising a flywheel and an AC motor/generator electrically coupled to a direct current (DC) bus, the flywheel system configured to store, as kinetic energy, power received from the power source and, when power to the load from the power source decreases below a specified threshold, to provide the stored power to the load as electrical power through the DC bus for a first duration; and a battery system electrically coupled concurrently with the flywheel system and without a switching circuit to the DC bus during the first duration and a second duration, the battery system to receive power from the power source through the DC bus, the battery system configured to store the power received from the power source and to provide power to the load through the DC bus for the second duration after the first duration, the sum of the first duration and the second duration is less than five minutes.