A Synchronous FET Class E Rectifier for >30 W Highly Resonant Wireless Power Receivers Speaker: Michael de Rooij, Ph.D., VP of Applications, Efficient Power Conversion
6.78 MHz highly resonant wireless power receivers based on the AirFuel standard experience high rectifier losses when using Schottky diodes and fail to meet the thermal limit requirements for many products such as laptops. This proposal uses a synchronous switch GaN FET in a class E topology as an alternative for a 30 W or higher receiver. Initial results show that a full bridge Schottky diode solution reaches a temperature of 70°C with 83.4% system end to end efficiency when delivering 30 W, while the GaN FET used in a class E rectifier reaches only 53°C and 86.1% efficiency
Kilowatt Laser Driver with 120 A, sub-10 nanosecond pulses in < 3 cm2 using an GaN FET Speaker: John Glaser, Ph.D., Director of Applications, Efficient Power Conversion
Lidar time-of-flight distance measurement has become the primary means of high-speed, accurate mapping of 3-D space. A primary application for lidar is for navigation and obstacle avoidance in real-time Advanced Driver Assistance System (ADAS) and autonomous vehicle navigation. The lidar pulsed laser transmitter is a key lidar subsystem. The transmitter must generate high power optical pulses of short duration of less than 10 ns. For a 10 s vehicle sense and response time, a range of 300 m is required, which in turn requires high peak laser power. This work describes a laser driver using a single commercial GaN FET to achieve current pulses into a laser diode of >120 A peak for a peak laser input power of > 4 kW, with a duration < 10 ns. The area occupied by the driver and laser is < 3 cm2.