At present, more and more automotive electronics system lighting designers are using LED lighting for practical and aesthetic purposes. LEDs are well known for use in a variety of automotive lighting components such as headlights, daytime running lights, fog lights, turn signals, interior lighting, infotainment backlighting, and combined taillights (RCL) and high level brake lights (CHMSL).
There are two main DC/DC power supply categories to consider when building an LED-powered electronic drive solution: linear regulators and switching regulators. Linear regulators have the advantage of reducing component count and reducing electromagnetic interference (EMI), but have serious drawbacks in terms of efficiency and heat dissipation. Therefore, switching regulators are the first choice for many designers' drive solutions. The DC power supply and the number and type of LEDs required determine the topology choice of the LED driver. If the supply voltage exceeds the total LED voltage, a buck converter is required. If the voltage of the LED group exceeds the supply voltage, a boost converter is required. Finally, depending on the specific conditions, the LED voltage may be higher or lower than the supply voltage, so power supply topologies such as buck/boost or single-ended primary inductor converter (SEPIC) should be used.
In the design of lighting systems, in addition to LED power supply, there are many factors to consider. Another major consideration in LED circuit design is thermal management. One way to improve thermal performance of an LED driver integrated circuit is by controlling the LED forward current as a function of temperature. This can be achieved by using an external current to sense the temperature and control the current supply to the LED, but a more efficient solution is to utilize an integrated circuit with the necessary built-in functionality.
National's products include a wide range of switching regulator ICs that enable multiple topologies. In addition, National Semiconductor has developed a range of integrated circuits for LED applications, many of which have features for automotive electronics applications. This article will explore several application examples of automotive electronics system headlight drivers.
Example of a headlight using a boost regulator
LEDs are increasingly being used in automotive headlights and other front-view lighting systems. Typical headlight applications may use 10 white LEDs arranged in a variety of ways. For the case where each LED has a maximum VF of 4V, if the designer wishes to use a topology in which all LEDs are connected in series in one lamp group, a DC/DC stage will need to be set to drive the LEDs. In this case, a single boost switching power stage can be used for the nominal 12V~14VDC power bus.
This Lead Acid Battery Bank is a kind of mobile power bank and supply, it is also called Mobile Power Bank,Portable Power Bank and Battery Charge Pal. This battery energy power storage is used for DC consumer electronics products and other DC electronic machines. This rechargeable Lead acid battery bank is convenient, portable, long-lived and multifunctional. USB interface, solar charging input / DC input interface and automobile emergency startup interface are integrated on the surface of battery bank.
This Battery Energy Storage Power,Mobile Power bank and Battery Charge Pal is 280WH with Short-Circuit and Over-discharge Protection, Cut-off voltage is 10.5V (Besides 12V 300A output interface)
Application in DC Fan, Mobile Phone, DV, DVD, IPAD, Notebook PC, Computer, Nail Painting Machine, Inflator Pump, Washing Machine, Car Starter (Urgently), Lighting, Router, Monitor, DVR, MP3/MP4/GPS/, Radio, DC TV, DC Projector, Audio and other DC electric products.
This Multifunctional power charge pal now is wildly applied in Africa, America, Europe and Asia, When you encounter a shortage of electricity, you have it, so you don't have to worry about your working electricity, traveling power supply, or domestic family daily power, etc.
USB Output:2PCS 5V2A
DC Output:4PCS 12V5A
DC Output:1PCS 19V4.7A
DC Output : 1PCS 12V300A
Solar Power Input:1PCS 18V50W
DC Input:1PCS 12V3A
1)Car starting less than 5 sec. and input current less than 3A
2)Please recharge this battery every 2-3 months without any using
3)Do not short connecting 12V 300A interface
4)Battery charge current less than 4A, Do not use charger its charging current higher than 4A which damage your battery
Lead Acid Battery Bank
Lead Acid Battery Bank,Portable Battery Charge Pal
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