Hybrid energy storage system

摘要

A hybrid energy storage system for supplying power to an application with a fluctuating load profile, such as, for example, electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, wind energy harvesting equipment and solar energy harvesting equipment. The hybrid energy storage system includes an ultra-capacitor electrically connected to a DC bus and a power source electrically connected to the DC bus via a controlled switch. The hybrid energy storage system further including a DC/DC converter connected between the power source and the ultra-capacitor, the DC/DC converter boosting a voltage of the power source to charge the ultra-capacitor. The DC/DC converter is preferably controlled to maintain a voltage of the ultra-capacitor at a higher value than the voltage of the power source.

主权项

1. A hybrid energy storage system for powering an application comprising:
an application connector for connecting to the application; an ultra-capacitor directly electrically connected to the application connector; a power source electrically connected to the application connector through a first path and a second path, wherein the first path passes through a bi-directional DC/DC converter and the second path passes through a switch and does not include the bi-directional DC/DC converter of the first path; wherein the hybrid energy storage system operates in a plurality of modes of operation including a low-power mode, a high-power mode; wherein during the low-power mode the bi-directional DC/DC converter is able to supply a power demand of application, the switch of the second path is off and the power source provides power to the application through the bi-directional DC/DC converter of the first path; and wherein during the high-power mode the bi-directional DC/DC converter is unable to supply the power demand of application, the switch of the second path is on allowing the power source to provide power to the application through the second path and the power source provides power to the application through the bi-directional DC/DC converter of the first path.