Smart Light Control System Overview
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This paper introduces the application experience of power chip in the intelligent car light control system, compares it with the traditional technology, and analyzes the technical advantages and development prospects of the intelligent diagnostic technology realized in the actual product application.
Today's MCU and power electronics technology in the development of smart lights control system is to replace the traditional relays and fuses with intelligent power ICs, effectively achieve protection and diagnosis of overheating, overvoltage, short circuit and other faults of the lamp; PWM for MCU Modulation to achieve control of the voltage across the lamp to achieve the purpose of limiting the lamp current, extending the life, and can easily achieve automatic replacement of the lamp failure and greatly reduce standby power consumption.
We use Infineon high-end switches for smart light control systems. The following is a detailed introduction to its application experience in actual products.
Infineon chip new features
The intelligent headlight control system is powered by a 12V low-voltage, high-current system in the car, and the Infineon intelligent power switch is controlled by the MCU to achieve all of the above functions. Infineon's next-generation chips are used in the lighting control system developed for the ROVER platform: BTS6142D and BTS5434G.
The step-by-step current limit is a very useful new function. In the case of overload and short circuit, the chip will automatically reduce the flow limit according to the increase of the tube pressure drop, so that in the event of frequent overload or short circuit and the MCU fails to operate, the chip can be well protected. Damaged, greatly improving the life of the chip under harsh conditions (as shown in Figure 1).
Fig.1 Relationship between stepped current limit control and MOS tube conduction voltage drop
In addition, Infineon's next-generation chips have extremely low standby power consumption, and the BTS5434G has a standby power consumption of only 5μA. In this way, the overall power consumption of the entire lighting control system is quite low.
Application design experience in actual products
In the actual product design, the BTS6142D current sensing signal has a setup delay time of 650μs. The output feedback can thus avoid the large inrush current when the high beam is started, but in the cold monitoring state, there is only 1ms detection period. Therefore, the MCU's AD detection link should be properly delayed and guaranteed. In addition, the BTS6142D input control needs to use the circuit shown in Figure 2 to be controlled by the MCU's I/O output signal.
Figure 2 Control circuit diagram of BTS6142D
The inrush current when the high beam is started is shown in Figure 3.
Figure 3 Inrush current diagram when the high beam is turned on
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 detected current is different, and the actual detection is as shown in the following formula:
According to different chip values. In practical applications, it is recommended to access the protection series resistor before entering I/O:
This can improve the sampling accuracy. As shown in Figure 4, R30 Plastic Industrial Network, R32.
Figure 4 Control circuit diagram of BTS5434G
The BTS5434G can use its current sensing enable function to multi-channel the current sensing output signals of multiple BTS5434Gs in a “wire-and-wire†manner, which is finally processed by the two AD ports of the MCU, which can effectively save MCU resources. And save multiple detection resistors. As shown in FIG. 4, in the practical application, all the switches are used to disconnect all the pull-up resistors for automatically detecting the load open circuit in the standby state, thereby further reducing the standby power consumption.
In the design, the function of the current sensing enable is activated by the MCU, and the feedback signals of each channel of the chip are sequentially turned on, and the sampling and detection are respectively performed, which can realize the time-sharing polling diagnosis, which can save many I/O resources and reduce the cost of the MCU.
Advantages and development prospects of intelligent diagnostic technology
With the new generation of Infineon chips, intelligent diagnostics can be implemented. By processing the AD sampling signal through the MCU, the current value and the open circuit state of each lamp control load can be accurately obtained. In the thermal monitoring state, the MCU can conveniently activate the switch to illuminate the designated lamp to replace the function of the fault light. By adjusting the frequency of the I/O output signal, it is easy to control the brightness of the specified lamp. Hanyang Technology can extend the life of the lamp when the power supply voltage fluctuates, and the lower standby power consumption will become the standard requirement of the automotive industry. It is difficult to obtain continuous and accurate current digital feedback signals using conventional technologies such as relays and early chips, and peripheral circuits are also highly susceptible to interference and increase standby power consumption. In addition, the traditional technology to transmit information to the instrument and the traveling computer through the CAN bus is much less than the intelligent diagnostic technology.
With the maturity of the automobile market, the perfect smart car light control system is no longer a patent for high-class cars. It has become the standard for mid-size cars and has become an important module that can reflect the technical content and configuration of cars.
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