The drive technology requirements of automotive LED lights

by Ente G. LED lighting for sale

Due to the brightness of the LED light being proportional to the flow of electric current, so I need a constant current source to drive the LEDs.In any case, to maintain a constant current through the LED light, to ensure the consistency of the LED brightness. You also need to in no case can ripple current control at an acceptable level. So the LED driver design belongs to the power conversion circuit design, characterized by a constant current output rather than the constant voltage output.

In the LED light driver design, it is necessary to increase the blocking circuit, to provide protection against power supply reverse operation. We will encounter another challenge to ensure that the LED light can work in the case of automotive cold start or load power failure. Under normal operating conditions, the car's battery supply voltage is between 9V and 16V (12V system bus, for example), and a large truck's battery supply voltage is between 18V and 32V (24V system bus, for example). In the case of power failure or a cold start of the load when the battery input voltage range of the normal range will differ widely.

During the period of a generator running, if the battery power supply is suddenly cut off the electricity opportunities continue to power generation, the use of generators electrical components such as the capacitance-voltage will appear the phenomenon of increased suddenly, if do not take protective measures, will be damaged by electrical appliances. If the LED light driver is not a constant current driver, the LED current can change, change of the brightness of the LED, which is why the current car lights flicker phenomenon exists. The following is a power load test of a definition, used to imitate the load sudden break some of the situations. Different manufacturers use different standards, so the definition of the power load tests is also each is not identical.

Although the load dump will cause the load voltage increases, the most advanced alternator is equipped with a central-controlled load power clamp. 12V bus system reference level will be limited to between 35V to 42V, and 24V bus system reference level is clamped between 50V to 60V. led explosion proof lighting https://www.eneltec-led.com/products/led-explosion-proof-lights

In cold weather, starting the device will make the battery supply voltage drop, since the input terminal of the LED light driver power supply battery is connected to inputs, so as such involve driving safety brake lights car lights must be independent of the load off and cold start effects, and even in this case it must be able to continue to operate normally. In a typical case, a 12V input bus system range from 6V to 42V, 24V input voltage range of 12V bus systems to 60V. best led headlights http://bestledheadlight.com/