Nowadays, most are conversant in lightweight emitting diodes or unremarkably referred to as LEDs. These lightweight sources area unit unremarkably related to longer life spans and energy potency. Considering that these low-tension lightweight sources area unit here to remain, understanding their drivers becomes a necessary a part of its perform.
Why Use LED Driver?
Think of LED driver as integrated power regulator specifically designed to supply constant voltage (current) with adjustable current (voltage). for top power lighting systems, you’ll integrate associate LED driver to regulate the LED power output as a part of your regulation strategy. The upstream regulator stages convert a high input voltage (typically AC mains or high DC voltage) all the way down to a lower DC level.
By adjusting the ability output from the LED driver, you’ll change the brightness of your LEDs. High power LED drivers area unit typically out there as surface mount elements with associate exposed pad for warmth dissipation into your substrate.
So, what’s associate LED driver? it’s associate device that delivers power to a string of LEDs in a very regulated manner. the motive force additionally prevents the LEDs from having a premature failure by dominant thermal runaway, that may be a development whereby with a rise within the temperature of associate operational LED, the forward voltage VF (i.e. the voltage the LED needs to conduct electricity and lightweight up) decreases thereby increasing this. Simply put, with time associate LED gets a lot of and a lot of hot and keeps drawing a lot of and a lot of current so eventually burning out early due a premature failure. Its effectivity is at its best, once its output ohmic resistance matches the input ohmic resistance of the LEDs.
The maximum variety of LEDs that one will run from a driver is found by dividing the most output voltage of the motive force by the forward voltage of the LEDs. currently the configuration of LED strings whether or not they are connected nonparallel or in parallel or part nonparallel and part in parallel is set by the configuration and application of the fixture. The decay part i.e. the lifetime of the electrical condenser within the LC filter circuit of the output aspect of the motive force truly defines the lifetime of the motive force and thence the total LED system. thence it’s necessary to decide on electrical condenser with a awfully smart life.
Designing associate LED driver – we want to think about some major factors before planning associate LED driver – like whether or not one wants a continuing current or a continuing voltage driver. alternative factors to think about area unit the kind of LED to be used, its soap luminous flux unit eighty current, its junction temperature, the appliance of the fixture, the house constraint among the fixture (if any), the business viability, whether or not dimming is needed etc. for many of the applications, low voltage DC input LED drivers (5-36 V DC) and high-voltage AC input (90-300 V) area unit counseled primarily as a result of their responsibility and stability.
Even the thought of DOB – driver on board is slowly gaining quality, that is essentially a chip that acts sort of a driver. Since it’s a solid-state device, it doesn’t have any decay part. Thus, its life is meant to be nearly the same as that of LEDs. once connected in bicycle with the LED strings, this terribly closely follows the voltage pattern so giving a type issue of virtually one. sadly, such a technology incorporates a little issue. It’s not a continuing current driver, therefore with the amendment in voltage, this changes, thereby dynamic the brightness of the LEDs. Technologists area unit still performing on ways that to repair this issue.
Applications of LED Drivers :-
Applications will vary from industrial, commercial, residential lighting to use in every day product, which has, automotive business, electronic gadgets – tv, smartphones, sensible refrigerators, music players, athletic facility instrumentality, etc. because of the ultra-low running value, usage and application of LED Drivers area unit increasing day-by-day.