The highest power density of a DC/DC converter is demonstrated

     In any EV or HEV, a DC/DC converter is essential for connecting a high-voltage battery to a low-voltage auxiliary circuit. This includes 12V power headlights, interior lights, wiper and window motors, fans, 48V, pumps, steering drivers, lighting systems, electric heaters and air conditioning compressors. In addition, DC/DC converters are also important for the development of more economical and fuel-efficient vehicles with an increasing number of low-voltage features.

     Gallium nitride, in particular, plays a crucial role here, as it can be used to improve the power density of DCDC converters and OBCs. Therefore, Vitesco Technologies chose GaN to improve the power efficiency of its Gen5+ GaN Air DC/DC converters. Infineon's CoolGaN transistor 650V significantly improves overall system performance while minimizing system costs and improving ease of use. That's why VESCO has created a new generation of DC/DC converters that set new standards for power density (over 96% efficiency) and sustainability for the grid, power supply and obc.

     The advantages of GAN-based transistors in high-frequency switching applications are significant, but more important is the high switching speed, which has been increased from 100kHz to more than 250kHz. This allows for low switching losses, even in hard switching half-bridges, with minimal heat losses and overall system losses. In addition, the company's CoolGaN transistors feature high switching speeds and are installed in top-cooled TOLT packages. They are air-cooled, eliminating the need for liquid cooling and reducing overall system costs. The 650V device also improves power efficiency and density, bringing the output power up to 800V. In addition, their on-resistance (R _DS(on)) is 50mOhm, the transient drain-source voltage is 850V, I _DS,max 30A, I _{DSmax, and the pulse} is 60A.

     Johannes Schoiswohl, Senior Vice President and General Manager of Infineon and Head of the GaN Systems Business Line, said: "We are delighted to see an industry leader like Viesco Technologies using our GaN devices and innovating in their applications. "When gallium nitride changes modes, as in this example from a liquid-cooled system to an air-cooled system, its ultimate value is demonstrated."

     With GaN transistors, Vitesco Technologies can design Gen5+ GaN Air DC/DC converters with passive cooling, thereby reducing the overall cost of the system. GaN devices also offer simplified converter design and mechanical integration. As a result, the converter can be flexibly positioned in the vehicle, reducing the workload of the manufacturer. The use of GaN also allows the power of the converter to be extended to 3.6kW and the power density to be increased to more than 4.2kW/l. Compared to the 5th generation liquid cooled converter, the converter is more than 96% efficient and has improved thermal performance.

     They provide a 248A two-phase output at 14.5V continuous voltage. Phases can be combined to achieve maximum output power. Nevertheless, it is possible to cut off a phase under partial load conditions and interlace switching frequencies between the two phases. In addition, by switching two-phase inputs in series, CoolGaN power transistor-based 650V converters can achieve 800V architectures without exceeding the device's maximum blocking voltage. The converter also has an isolated half-bridge topology consisting of a GAN-based half-bridge, a fully isolated transformer, and an active rectifier unit for each phase.