Texas Instruments, a leader in DC-based LED driver IC technology, recently introduced integrated circuit technology that simplifies the design of AC-driven solid-state lighting products.
So-called AC-LED technology has long been the focus of research for companies such as Seoul Semiconductor and LynkLabs UK, which sell lighting engines, because lighting engines need to incorporate LED and AC drive technology, but developers of solid-state lighting products are using integrated circuits The form of direct contact with this technology. Texas Instruments expanded its business to include LED drivers and introduced the TPS92411MOSFET converter designed to simplify the design of AC-based lighting engines.
The advantage of an AC driver is that it is much simpler than the AC-DC switched power supply used in traditional LED drivers. John Perry, a product marketing engineer at Texas Instruments, said the new IC driver bill of materials will be 20-50% cheaper than a DC-based driver and the board will be simpler. No inductive components are required for filtering.
We predict that AC-LED technology will evolve into another driver of the same level as integrated circuit technology in the future. Seoul Semiconductor announced that it will sell sell an Acrich IC, although customers have to buy the company's LED to buy IC, DMB Technologies Inc. announced the launch of AC drive IC. In addition, there are many new companies dedicated to AC driver IC research.
The Texas Instruments Approach Like many of the companies in this industry, the AC input lines rise in voltage every half-cycle, breaking down LED stacks and turning more LEDs on. This line is the first full-wave rectifier line, which means the LED is switched at 120Hz.
Texas Instruments method is not very different but significant. Another approach proposed at the conference was to strategically place multiple taps in a series of LED stacks. As the AC line input goes up, the supply voltage is output from a higher tap in the stack, so more LEDs will be lit. However, Texas Instruments uses an active switch to electrically isolate every part of the LED in the stack. The TPS92411 is essentially a floating switch relative to the ground. According to the nearby diagram, multiple switches used in the design use relatively simple discrete components.
The advantage of this approach is that across each LED subdivision cell, a small capacitor is placed to store energy. Even if the AC line voltage is too low to power the entire LED stack, the capacitor can take over the role of voltage, keeping the LED glowing and improving LED utilization.
Perry of Texas Instruments said the design will reduce flicker. And close to the pure resistive load, so the intrinsic high power factor above 0.95. The entire harmonic distortion less than 15%.
The company also released a development board to facilitate developers of solid-state lighting products to immediately experience this technology. TPS92411 lighting engine evaluation module priced at 75 dollars, Texas Instruments online shop has sales.
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