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We use Infineon high-end switches for smart car light control systems. The following describes its application experience in actual products in detail.
New functions of Infineon chip
The intelligent lamp control system is powered by the 12V low-voltage high-current system in the car, and the Infineon intelligent power switch is controlled by the MCU to achieve all the above functions. In this light control system developed for the ROVER platform, Infineon's new-generation chips are used: BTS6142D and BTS5434G.
Among them step-by-step current limit is a very practical new function. In the case of overload and short circuit, the chip will automatically reduce the current limit according to the increase of the tube voltage drop, so that when the frequent overload or short circuit occurs and the MCU fails to operate, the chip can be well protected from the Damaged, greatly increased the life of the chip under harsh conditions (as shown in Figure 1). 
Figure 1 Relationship between step-by-step current limit control and MOS tube turn-on voltage drop
In addition, Infineon's new generation chips have extremely low standby power consumption, and the standby power consumption of BTS5434G is only 5μA. In this way, the overall power consumption of the entire light control system is quite low.
Application design experience in actual products
In the design of the actual product, the establishment delay time of the BTS6142D current sensing signal is 650 μs, so the output feedback can avoid the large inrush current when starting the high beam lamp, etc., but in the cold monitoring state, there is only a detection period of 1ms Therefore, it is necessary to properly delay and ensure the speed of the AD detection link of the MCU. In addition, the BTS6142D input control requires the circuit shown in Figure 2 to be controlled by the I / O output signal of the MCU. 
Figure 2 BTS6142D control circuit diagram
The inrush current when the high beam lamp is started is shown in Figure 3. 
Figure 3 The inrush current diagram when the high beam lamp is started
In the design, changing the feedback signal output detection resistance value (R42) can adjust the level of the MCU input AD sampling signal to control the sampling accuracy in the full current range. 
However, in actual situations, the relationship between the actual load current and the detection current is different. The actual detection is shown in the following formula: 
The value is different according to different chips. In practical applications, it is recommended to connect the protection series resistance before entering the I / O: 
This can improve the sampling accuracy. As shown in Figure 4, R30 Plastic Industrial Network, R32. 
Figure 4 BTS5434G control circuit diagram
BTS5434G can use its current sense enable (Sense Enable) function to use multiple "BTS5434G" current sense output signals in "wire AND" mode, and finally processed by the two AD ports of the MCU, which can effectively save MCU resources And save the multi-channel detection resistance. As shown in Figure 4, in actual application, a one-way switch is also used to disconnect all the pull-up resistors used to automatically detect the open load in the standby state, which further reduces standby power consumption.
In the design, the MCU enables the current sensing enable function, sequentially turns on the feedback signals of each channel of the chip, and samples and detects separately, which can realize time-shared diagnosis in turn, which can save many I / O resources and reduce the cost of MCU.
The advantages and development prospects of intelligent diagnosis technology can be realized by using Infineon's new generation of chips. By processing the AD sampling signal through the MCU, the current value and open circuit state of each light-controlled load can be accurately obtained. In the thermal monitoring state, the MCU can easily start the switch and light up the specified lamp to replace the function of the fault lamp. By adjusting the frequency of the I / O output signal, the brightness of the specified lamp can be easily controlled. Hanyang Technology can extend the life of the lamp when the power supply voltage fluctuates, and lower standby power consumption will soon become a standard requirement in the automotive industry. It is difficult to obtain continuous and accurate current digital feedback signals using traditional technologies such as relays and early chips, and peripheral circuits are also extremely susceptible to interference and increase standby power consumption. In addition, the traditional technology transmits light control information to the instrument and the driving computer through the CAN bus to be much less than the intelligent diagnosis technology.
As the automobile market matures, the perfect intelligent light control system is no longer a patent for high-end cars, and it has become the standard configuration for mid-level cars, and it has become an important module that can reflect the technical content and configuration level of cars.
Application of Infineon chip in intelligent car light control system
This article introduces the application experience of power chips in smart car light control system. The trend of MCU and power electronics technology in smart car light control system today is to replace traditional relays and fuses with smart power ICs to effectively realize the Protection and diagnosis of overheating, overvoltage, short circuit and other faults; MCU uses PWM modulation to control the voltage across the lamp in order to limit the lamp current and extend the service life, and can easily achieve the failure of the lamp Automatically replace and greatly reduce standby power consumption.