The WiT-2000 Kit enables users to evaluate and demonstrate potential applications for WiTricity's patented (US 7,825,543 & US 7,741,734) and patent pending technology for wireless energy transfer. The modules can be configured by the user to provide wireless charging and battery free direct powering of devices when used within the range of the WiTricity energy source. Included with the kit are resonating repeater pads which allow energy "hopping" and further increase the range of wireless energy transfer. The kit also demonstrates WiTricity's unmatched ability to transfer energy without requiring precise alignment or close proximity, thereby providing great application flexibility to the developer.
The WiT-2000 Kit provides a complete set of energy source and capture modules that can be integrated with a wide variety of user supplied electronic devices. These modules are provided in enclosures, to facilitate rapid prototyping and demonstration. Note that additional board level and packaged modules are available for purchase from WiTricity.
- WiTricity wireless energy source, including integrated WiTric™ power amplifier and WiTricity High-Q Source Resonator pad
- Two WiTricity energy capture modules, including WiTric™ power converter and WiTricity High-Q Capture Resonator
- WiTricity wirelessly powered LED light (with integrated WiTricity energy capture module)
- Two WiTricity High-Q Resonant Repeaters
- DC power supply
- Instruction manual
- Online Application Support
Energy transfer over distance and through many materials
The WiT-2000 Kit components are designed to transfer energy over distances ranging from less than a centimeter (directly on the surface of the charging pad) to distances totaling several tens of cm. The WiT-2000 technology is based on fixed-tuned source architecture. This means that the charging pad is optimized to transfer energy at maximum efficiency at a pre-determined distance. The charging pad is optimized for transferring energy over a distance of from 15-30 cm directly to the LED light or over even longer distances via a resonant repeater (see below), and it can also transfer energy to devices placed directly on the pad. The ability to transfer energy over distance means that the pad can be hidden from view behind a wall, or under a table top, and still provide useful levels of power to devices placed on or near the work surface. The system can efficiently transfer energy through non-conductive materials, such as wood, plastic, glass, concrete, fabric, wall board, water, oil, and even human or animal tissue.
WiTricity technology transfers energy by harnessing the power of highly resonant magnetic coupling. The WiTricity wireless energy source converts a DC input voltage to a 250 kHz AC signal. The high frequency AC signal is used to energize the WiTricity High Q resonator, which creates a 250 kHz oscillating magnetic field around the resonator. When a WiTricity High Q capture resonator is brought within range of the source, the resonators couple and the oscillating source magnetic field induces electrical current to flow in the capture resonator. This alternating current is rectified (converted to DC), regulated to a specific DC voltage, and output to an external load. "High Q" refers to the Quality Factor of the resonators, WiTricity technology that is essential for efficient energy transfer over distance.
Energy "hopping" to increase distance range
The distance over which energy can transferred can be extended through the use of WiTricity High-Q resonant repeaters. A High-Q resonating repeater is a tuned resonant coil that can be packaged as a very thin and flexible substrate. It is not connected by wire to an energy source; instead, it enables the magnetic field created by the WiTricity source resonator to "hop" over a large distance from the source to a capture device. This patented technology is an extremely effective method of extending the distance range of a wireless energy transfer system. Such resonant repeaters have been deployed in single unit configurations, placed on or integrated into a piece of furniture, and in multiple unit configurations, deployed in building materials such as carpeting, floor tiles, or wall panels—to extend energy transfer distance range over an entire room.
The WiT-2000 is provided with two High Q resonant repeaters, one measuring 300 mm x 300 mm (12" x 12") and one measuring 160 mm x 160 mm (6" x 6"). These can be used individually or in combination.
Simplified charging pad architecture
The WiTricity source resonator is constructed using a single large High Q coil wound near the perimeter of the pad. A single power amplifier inside the source is used to excite the source resonator. Multiple High Q capture devices can couple to this single source resonator, enabling multi-device charging at minimum cost. In contrast, first generation inductive charging solutions require precise alignment of the source and capture devices, often relying on permanent magnets or other mechanical methods to fixture the capture device in place. The WiTricity architecture therefore has compelling cost and performance advantages over multi device charging pads built using traditional inductive coupling. It avoids the cost and complexity of moving parts and redundant coils and amplifier circuits, resulting in a more reliable and lower cost design.
Please contact us to discuss possible applications.