Transmitter Hardware

🟦 Controller

The microcontroller is in charge of both controlling and monitoring the flow of power and data through the transmitter, as well as handling errors and enforcing protections. Our custom firmware lives here and is what enables our high efficiency, flexibility and ease of integration.

🟥 Power Stage

The power stage handles the flow of power through the resonant circuit. This can be either a half-bridge or full-bridge design. In this case we have implemented a half-bridge design.

🟨 Configuration Port

The USB-C configuration port enables you to configure the operating parameters of the transmitter by connecting to a computer and using our web configuration tool.

🟪 Resonant Circuit

Together, the coil and capacitors form the resonant circuit which defines how much power you can deliver, and at what frequencies you should operate. The formula for calculating your resonant frequency is: $f_{resonant}=\frac{1}{2\pi\sqrt{LC}}$, where L is the coil inductance value and C is the selected resonant capacitor value.

Coil

The coil (connected through the screw terminal) acts as the antenna for wireless power transmission. Three coil sizes have been included in your kit so you can choose the size most suitable to your application. Connect to the board using the screw terminal highlighted above.

Resonant Capacitors

The five resonant capacitors are connected in parallel using solder jumpers, so bridging multiple solder jumpers results in the capacitor values adding up. Generally, the resonant capacitors define how much current is able to flow through the system. You can increase the max current by selecting a larger capacitor value, or decrease it by selecting a smaller capacitor value. The larger gray capacitors have a value of 100nF each, and the small white capacitor is 47nF.

🟧 Power Input

Power is connected using the power input screw terminal highlighted above. Most basic setups will use an input voltage of 12-24V.

🟩 LEDs

The four status LEDs are used to indicate the current mode of operation. The modes are outlined in detail in Modes of Operation