Patent ID: 9099887
Filing Date: 2015-08-04
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; a battery system electrically coupled concurrently with the flywheel system and without a switching circuit to the DC bus, the battery system to receive power from the power source and the battery system configured to remain electrically coupled to the DC bus while the flywheel system is providing power to the load, to store power received from the power source and to provide power to the load through the DC bus; and a controller coupled to the flywheel system and the battery system, the controller configured to monitor the flywheel system and the battery system.