英飞凌汽车灯光控制解决方案

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Within automotive comfort electronics, the Central Body Controller with the Light Control is the key application in terms of functionality and silicon content. The central body control includes the switching of all the lights in the car, but also other functions like gate way and control of relays for heavy loads.

Today, the functionality of light control is increased dramatically. Besides the pure switching of the light, a complete protection and diagnosis is also required. Infineon?s smart power devices protect the application and themselfs, so there is no need for fuses anymore. This leads to a massive system cost reduction. By using smart semiconductors all kind of failures like short to ground, open load or broken wire can be detected. The use of devices the current sense feature enable the use of standard bulbs or LEDs with the same hardware.
From LEDs up to 65W highbeam or HIDL-Xenon lights, Infineon offers the right power driver. The board net voltage of a car can go up to 16V, but the bulbs have only a rating for 13.5V and overvoltage is dramatically reducing the lifetime. So the control and maintaining of the voltage at the bulb is done using a PWM frequency ( pulse width modulation ) of 100Hz and the duty cycle is depending on the board net voltage. Infineon Smart Power Switches are specially designed for PWM control including an active edge shaping for lowest EMC emissions.
Infineon offers a complete range of products for this application, covering all necessary functions such as Highside-Switches, Lowside-Switches, Relay and LED driver, communication, supply, sensors and microcontrollers. Standard stand-alone products as well as Application Specific Standard Products(ASSPs)are available.

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