As Tesla, an American electric vehicle manufacturer, began to break through the electric vehicle market, the global electric vehicle market also began to permeate a fairly optimistic atmosphere. However, in spite of this, electric vehicles still bear the environmental mission of energy saving and carbon reduction. How to make energy more efficient has become a major test in system design, plus the safety of human life must also be placed in the first place as a consideration Although the prospect of electric vehicles is optimistic, there are still many challenges to be faced at the system level.
Drawing: In order to minimize the system risk, if problems occur during wafer inspection, it is also necessary to give up the entire wafer. Source: investors.nxp.com
Lin Zhisheng, deputy director of the technical department of ROHM (Rom Semiconductor) Taiwan Design Center, said that, broadly speaking, the power management of electric vehicles can not only look at the inverter, motor control and battery management systems, all systems of electric vehicles will have All aspects of the processor, microcontroller, system interface, and car imaging require power supply, and the efficiency of power management in this area is actually what the industry needs to pay attention to. In fact, excluding the inverter and the motor drive system, most systems of electric vehicles are driven by direct current, so the performance of DC / DC components or LDO (low dropout regulator; low dropout linear regulator), It becomes the key to the overall power consumption of the system.
In terms of DC power supply design, due to the continuous improvement of process technology in recent years, the overall performance of DC / DC components has been quite excellent, so the visibility of LDO is not so high. However, Lin Zhisheng also said that taking ROHM itself as an example, the quiescent current of LDO in standby mode is much lower than that of DC / DC components. If the car body is stationary, if it intends to minimize the overall power consumption, LDO is an absolutely indispensable component. Such as keyless start function, clock, car navigation data backup and anti-theft system, etc., will be the space where LDO can play. But relatively, when the system enters the operating state, the efficiency performance of DC / DC will be much higher than that of LDO, so depending on the actual application environment, both DC / DC and LDO have their market needs.
Returning to the market of electric vehicles and hybrid vehicles, the types of components required in accordance with power requirements will also have different differences. In terms of the positioning of Infineon's component products, the range below 3kW (inclusive) will take the main role of MOSFET, and the IGBT will be responsible for the range below 6kW (inclusive), and the power module will be from 6kW to 100kW. Responsible, and according to the different power levels, Infineon also has corresponding power modules to respond.
Chen Tianbao, chief engineer and director of Infineon Technologies Asia Pacific, said that although Infineon ’s solutions for automotive power components are quite complete, there is a large gap between automotive and industrial component requirements. He bluntly said that Infineon will conduct wafer inspection before the wafer has entered the dicing stage. As long as there is a problem with a certain die, the entire wafer will be discarded for use. At first glance, although it seems It's a pity, but in order to be able to meet the specifications of the car and consider personal safety, such disposal does have its necessity. In addition, the lead time (Lead TIme) will also be extended to six months, and there is no small gap between the three months of the industrial field. Lin Zhisheng also added that AEC-Q100 is indeed a very important specification in the field of automotive electronics, but depending on the actual demand and demand, not all systems need to meet this specification, as long as the customer has the demand, provide a compatible car Regulatory components are not a problem.
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