1. Field of Invention
The present invention relates to a fan system, and more particularly to a fan system capable of storing energy by itself for re-usage.
2. Related Art
Accompanying to the development of technology, the functionality of electronic system is upgraded and the integration of electronic devices is also raised. Electronic system is generally disposed at least one fan for heat dissipation to keep electronic system being normally operated.
In order to enhance the effect of heat dissipation, a plurality of fans are connected with each other in series to raise the pressure and volume of airflow. As shown in FIG. 1, a conventional fan system 1 includes a first fan 11 and a second fan 12. An external voltage source P is connected with the first fan 11 and the second fan 12 when the first fan 11 and the second fan 12 are connected in series. However, the second fan 12 is rotated by the first fan 11 and needs not to be driven by the voltage source P when the first fan 11 is driven to rotate by the voltage source P. In addition, the second fan 12 is driven by the voltage source P when the first fan 11 is out of order. The first fan 11 is thus driven to rotate by the second fan 12. Under such construction, the first fan 11 or the second fan 12 is driven by the other fan, and the energy generated by the driven fan is wasted and not recycled for re-usage. The heat dissipation of the electronic system will be affected if the voltage source P is out of order.
It is thus imperative to provide a fan system capable of storing energy by itself for re-usage.