In the age of wireless communication and portable music players the demand for powering those devices wirelessly is ever prevalent. The advantages of portability and wireless communication are greatly hindered by the fact that the devices themselves must be plugged into the walls to charge. The next generation in portable devices is a device that receives power wirelessly. The first step in wireless power is providing power to a computer charging pad wirelessly. The market for this device would be businesses with large conference rooms.
The device would allow users to plug their phones and computers into the conference room table without large power bricks and cords running everywhere. The pads can conveniently be placed under the table and inside the ceiling so there are no visible wires that could ruin the aesthetic feel of the room. The ease of installation and convenience of this device would make the marketability of this product quite large and if finished could be seen in thousands of conference rooms. If the efficiency of coupling could be increased slightly further, wireless power transmission could become a standard means for charging a mobile device.
The overall goal of this project is to design and successfully implement a wireless power transmission system to be used in a conference room. The system will work by using resonant coils to transmit power from an AC line in the ceiling to a pad on the table. The pad will output DC voltages in order to charge computers and cell phones.
There are several benefits for the use of such a system:
- Elimination of cords on the ground that make tripping hazards.
- Allows no wire installation and mobility on table.
- A necessary step towards consumer wireless power.
The entire interface has the following features:
- Feedback control for driving frequency to maximize efficiency.
- DC power output for computers and cell phone charging that allows for elimination of large power bricks.
- Slight mobility offered for different table heights and positions.
Table 1: Design Specifications
|Transmission Efficiency||>30 %|
|Overall Efficiency||>25 %|
|Output Voltage||18 VDC ± 1.8 V
5 VDC ± .5 V
|Frequency||Within 10 kHz of optimal|
|Power Abilities||Laptop and cell phone|