Automobile taillight lighting- led ceiling light-joel led light
 
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Automobile taillight lighting- led ceiling light
add persion:admin add time:2010-2-12 12:03:15 read:6064times

Automobile taillight lighting- led ceiling light

Automobile taillight lighting and control systems raises several interesting issues that will also appear in the control devices and controlled devices are very far from each other the other systems. LED is essentially a current device. Electron-hole pairs of compounds in the presence of luminescence compound, and fired at the compound when the photon. Current increase will be a corresponding increase in the speed and flux composite output. The efficiency of this process is not 100% (almost less than 100%) of the current increase in power consumption will also increase by 1-h the device self-heating. Unless the poor working conditions, otherwise the LED is generally not as catastrophic as the incandescent light failure, but tend to darken due to aging. Designers put a lot of devices is defined as the termination of the life of LED light output down to 50% of initial value time. Over-current and over-temperature conditions will accelerate the LED end of life, so the majority of OEM device manufacturers recommend a careful control of LED energy.
 
    These features suggest that in order to achieve the led ceiling light in the car CHMSL or component life expectancy of 11 years, car body control module should be based on a constant current to operate the various devices. However, as AnalogDevices automotive market experts BillReidel said, the constant-current design allows the body control module and the lamp wiring between components of the complex, and the drive power control IC designers to control the module removed from the body, put it into the lamp housing. Constant-voltage driver IC can control the reserves need to control the IC fault detection state information of the control module, but also in the same design to reduce external components (ie, fuse) the number and control module and wiring between the number of lamp housing.

AnalogDevices's AD8240LED driver / monitor is a concrete manifestation of this approach. The device operating current is 300mA, power supply voltage range of 9V ~ 27V. PWM input controls the lamp brightness, in order to achieve in line with the provisions of cars during the day and night different minimum brightness levels. Over-current detection circuit consists of an external high side shunt resistor and an on-chip comparator formed. If the shunt resistor across the voltage drop exceeds the reference voltage (typically 5V), over-current detection circuit to lock the output drive signals. Latch on each PWM cycle will then reset.

Automobile taillight lighting- led ceiling light

 
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