TDK and Robert Bosch GMBH have unveiled a new ultra-low loss diode, the active rectifier diode, for light vehicle generators. It can improve the efficiency of generators by 8% compared with traditional power conversion methods and help generators to qualify for eco-innovation under EU regulations. Deploying the new diodes could reduce the car's CO2 emissions by 1.8 g/km. Because it can replace standard devices one-to-one, active rectifier diodes can be easily applied even to mass-produced generators and cars.
"TDK is known for its tremendous efforts in supporting electric vehicles. At the same time, we realize that it remains critical for automakers to reduce CO 2 emissions from conventional vehicles, "said Finn Felsberg, Vice President and General manager of Power integration and Supply for Infineon Automotive. "Given that the number of internal combustion engine vehicles is still very high, our new diodes represent a quick and cost-effective step for Oems to meet stringent fleet emissions targets." "This innovative product fits perfectly into Bosch's 'invented for life' range of rugged and high-quality automotive parts," said Mark Jackman, Vice President, Automotive Electronics, Bosch Oceania.
In conventional cars, electricity generated by generators is used to charge batteries and power a growing number of safety and comfort features, such as driver assistance systems, air conditioning and infotainment systems. The new diode allows the generator to achieve more than 80% power conversion efficiency. At present, they typically reach only 72 per cent.
The active rectifier diode is based on a new chip technology from Infineon that integrates MOSFETs, capacitors and control logic on a single chip, thus avoiding the complex installation of separate chips. Bosch then presses the Infineon chip into the main body of the diode. This new diode is unique due to its extremely low diode forward voltage of 0.1V at 100A IRMS (root mean square current) and lowest leakage current. In addition, it is characterized by a simple assembly process, robust machinery, as well as high reliability and electromagnetic compatibility.
The supply position
Active rectifier diodes are being manufactured by Bosch and are being marketed to generator manufacturers worldwide. Vehicles using the new technology will be on the market from the second half of 2020.