Go Yamada

Operation analysis of high efficiency grid connected bi-directional power conversion system for various storage battery systems with bi-directional switch circuit topology

In recent years, there is an increasing demand for various types of storage battery systems, such as home battery systems, V2H(Vehicle-to-Home)/V2G(Vehicle-to-Grid) systems, and UPS systems. Performance requirements for the power conversion system within these storage battery systems are small size, light weight and high efficiency. We propose a new power conversion system so called the GAP-D3 converter that is a bi-directional power control system, comprising of a bi-directional switch circuit topology with natural commutation switching mode. This paper describes the features of GAP-D3 converter including this new current compensation control with simulation and experimental results.

A compact GaN Bi-directional switching diode with a GaN Bi-directional power switch and an Isolated gate driver

A compact and fast GaN bi-directional switching diode is described, which is integrated with a GaN/Si bi-directional power switch and a Drive-by-Microwave (DBM) isolated gate driver using a microwave wireless power transfer. The fabricated 600V 15A GaN bi-directional switching diode exhibits its low Ron of 160 mΩ under 85 °C ambient temperature without an external heat sink. The compact 12mm × 25.5mm × 3mm module also has a cooling pad to directly release heat from the GaN bi-directional power switch. By the fabricated module, the 1.0 MHz fast current direction switching was successfully realized with constant low power consumption of 0.8W thank to a gate power sharing technic by the DBM gate driver.