The Fraunhofer Institute for Applied Solid State Physics (Fraunhofer IAF) in Fraunhofer, Germany has announced that it has succeeded in bringing the existing brightness to 1000 lm by using gallium nitride (GaN) in the LED control circuit. LED light bulbs have been transformed into 2090lm high-brightness LED bulbs, and the luminous efficiency of LED bulbs has also increased by several percentage points.
Fraunhofer IAF retrofits part of the control circuit to increase the luminous flux of LED bulbs from 1000lm to 2090lm
The role of the LED control circuit is to maintain the output current of the AC to DC converter at a constant level. According to Fraunhofer IAF, LED chips are very susceptible to current fluctuations, and the reliability of the control circuit has a great influence on the life of the chip. In general, the transistors of the control circuit use silicon semiconductors.
This time, the Fraunhofer IAF used GaN transistors instead of silicon transistors to make control circuits. It has also been confirmed that even if the current, temperature and voltage are larger than those of the silicon transistors, the GaN transistors can operate with very high reliability. The operating efficiency of the control circuit is also relatively high, which is 86%, which is 1 to 4 percentage points higher than that of the silicon transistor.
In addition, a control circuit using a GaN transistor can operate at a high frequency of 10 times or more compared to when a silicon transistor is used. This means that the size of devices such as inductors and capacitors can be reduced. If the size of the device can be reduced, it will contribute to the further miniaturization of the LED bulb and the reduction of the manufacturing cost.
The Fraunhofer IAF stated that for a commercially available lamp with a brightness of approximately 1000lm, replacing its control circuit with the above control circuit using GaN transistors, the luminous flux can be increased to 2090lm. (Author: wild Zezhe students, the Nikkei online technology feeds!)
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