The led headlight bulb has a great influence on our production and life and brings us a lot of conveniences. So what is the design of the led headlight bulb? Let's take a look together next.
Here is that the content list:
Drive design
Conditions that the design needs to meet
Drive design
The driving mode of the led headlight bulb can adopt 3 types of resistance current limiting, linear regulator, and switching converter. The resistance current limiting scheme is suitable for applications with low efficiency, so this method is not used in automotive lighting with extremely high-efficiency requirements and a wide input voltage range; linear regulators are suitable for low current or LED forward voltage drop slightly lower than the power supply. In the case of high voltage, the dual-beam led headlight bulb efficiency and small input voltage range also exist; the switching converter has the characteristics of flexible circuit topology, high efficiency, and wide input voltage. Therefore, after comprehensively considering factors such as led headlight bulb work efficiency, installation size, quiescent current, operating voltage, noise, and output adjustment, switching converters are mostly used in the drive circuit.
Because the input voltage range of the storage battery will be very different from the normal range, the drive circuit generally needs to meet the voltage requirements of the LED array. The DC gain of this circuit topology is related to the duty cycle. When the battery voltage is lower than the voltage required by the led headlight bulb, adjust > 0.5 to make the circuit in a boost state; when the battery voltage is higher than the voltage required by the LED, adjust <0.5 to make the circuit in a step-down state. LED is a current-controlled element, whose brightness is proportional to the current flowing. If the dual-beam led headlight bulb is not driven by a constant current, the brightness of the LED will change even if the voltage is constant when the current passing through it fluctuates. To ensure stable and reliable brightness, LEDs need constant current to drive, but also need to be able to control the ripple current to an acceptable level under any circumstances. Therefore, the output of the LED drive circuit must be a constant current output rather than a constant voltage output.
Conditions that the design needs to meet
(1) The led headlight bulb has a buck-boost function. When the input voltage or the voltage drop of the LED itself fluctuates, adjust the output voltage to meet the requirement of constant output current and ensure the stable and reliable light emission of the led headlight bulb.
(2) High Power led headlight bulb high power conversion efficiency. To reduce drive loss, save costs while reducing the number of battery charging, extend battery life.
(3) Brightness adjustment function. When the surrounding environment is very dark, the signal lamp often does not need to be driven by the maximum current. At this time, the driving current can be controlled to change the brightness of the LED, thereby reducing the power consumption of the LED. The commonly used method of adjusting the drive current of the High Power led headlight bulb is PWM signal control.
(4) The led headlight bulb has a complete protection circuit. Various protective measures should be set up to protect themselves and the reliable operation of the LED. For example, low voltage latch, overvoltage protection, overheat protection, output open circuit or short circuit protection, etc.
(5) High Power led headlight bulb has good heat dissipation function. According to the thermal characteristics of LEDs, the temperature is one of the important factors affecting the operation of LEDs. When driving at night, the LED is lit for a long time. Therefore, it must have a good heat dissipation function to ensure the life and reliability of the LED.
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