Texas Instruments, a leader in DC-based LED driver IC technology, has introduced integrated circuit technology that has made AC-driven solid-state lighting products easier to design.
For companies selling lighting engines such as Seoul Semiconductor and LynkLabs, the so-called AC-LED technology has always been their research focus, because lighting engines need to combine LED and AC drive technology, but solid-state lighting products developers use integrated circuits. The form is in direct contact with this technology. Texas Instruments has expanded its business to include LED drivers and introduced the TPS92411 MOSFET converter to simplify the design of AC-based lighting engines.
The advantage of AC drives is that they are much easier to supply than AC-DC switched power supplies used in traditional LED drivers. John Perry, product promotion engineer at Texas Instruments, said the new integrated circuit driver's bill of materials will be 20-50% cheaper than DC-based drives, and the board will be simpler. Inductive components are not required for filtering.
We predict that AC-LED technology will develop into another driver of the same level as integrated circuit technology in the future. Seoul Semiconductor announced that it will sell sellitsAcrichIC. Although customers must purchase the company's LEDs to purchase ICs, DMB Technologies has announced the launch of AC driver ICs. In addition, there are many new companies working on AC driver IC research.
The Texas company's approach is the same as that used by many companies in the industry. The voltage on the AC input line rises every half cycle, subdividing the LED stacks, allowing more LEDs to be powered. This line is the first full-wave rectification line, meaning that the LEDs are converted at 120Hz.
Texas Instruments' approach is small but significant. Other implementations presented at the conference were to strategically place multiple taps in a series of LED stacks. As the AC line input rises, the supply voltage is output from a higher tap in the stack, so more LEDs will be illuminated. However, Texas Instruments uses active switches to electrically isolate each part of the LEDs in the stack. The TPS92411 is essentially a switch that floats relative to the ground. According to the nearby diagram, the multiple switches used in the design use relatively simple discrete components.
The advantage of this method is that a small capacitor is placed to store energy across each LED subdivision unit. Even if the AC line voltage is too low to power the entire LED stack, the capacitor can take over the role of voltage and keep the LEDs lit, thereby increasing LED utilization.
Perry of Texas Instruments said the design would reduce flicker. And close to the pure resistive load, so the inherent high power factor is above 0.95. The overall harmonic distortion is less than 15%.
The company also released a development board to allow developers of solid-state lighting products to experience the technology immediately. The TPS92411 Lighting Engine Evaluation Module is priced at $75 and is available at Texas Instruments online stores.
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