At present, whether it is household electricity, industrial and commercial electricity or public electricity, almost all of them are powered by alternating current. When traditional DC-LEDs are used for lighting, etc., AC-DC converters must be used to convert AC power into DC power. The advantage of this power supply mode is that the DC power is stable and the LED can continuously emit light.
However, in the actual application process, the use of the AC-DC converter also brings many other problems, such as: 1. In the process of AC-DC conversion, 15 to 30% of the power consumption is lost, resulting in unnecessary power waste. Contrary to the high-efficiency and energy-saving features of LED; 2. The cost of AC-DC converter is high, which invisibly increases the cost of the user; 3. The electronic components in the AC-DC converter have a short life span and cannot be as long as 10 with the LED. The life span of several years is matched; 4. The LED is in an uninterrupted working state during DC driving, which generates a large amount of thermal energy, which causes severe light decay of the device.
In view of the shortcomings of the above traditional power supply methods, many companies hope to solve the above problems by AC-LED. The AC-LED uses the principle of a rectifying circuit to enable the LED to operate directly under AC power. However, since the alternating current is periodically changed, the LED may be strobed when it emits light.
There are two main solutions available. Firstly, the series circuit is used to improve the waveform, which can effectively improve the power factor, but also reduces the efficiency. Secondly, the parallel circuit filter capacitor can alleviate the stroboscopic light, but at the same time brings the life limit. And reduce the power factor.
Recently, Sichuan Xinli Light Source Co., Ltd. (hereinafter referred to as Xinli Light Source) has effectively solved the problem of AC-LED by using the newly developed phosphor. When the current period changes, the delay variation of the brightness of the phosphor can be used to effectively compensate for the stroboscopic flash. technical challenge. Recently, Gaogong LED reporter interviewed Mr. Zhao Kun, Director of Xinli Light Source R&D Center for AC-LED related issues:
Gaogong LED Reporter : In view of the many problems that traditional DC-LEDs have in practical applications, many companies are now investing their eyes in the AC-LED field. Excuse me, what advantages do AC-LEDs have over DC-LEDs?
Zhao Kun: Traditional DC-LEDs need to convert AC power to DC power, which needs to be realized by AC-DC converter. Due to the high cost, low light conversion efficiency and short life of this kind of power supply, it is contrary to the original intention of LED energy-saving. Therefore, the development of AC-LED lighting products that can be directly used in the AC grid is the future development direction of the LED lighting industry. Compared with the traditional DC-LED, AC-LED has the following advantages: 1. The driving power supply in the traditional DC-LED lighting product is removed, which effectively solves the heat dissipation problem caused by the driving power source, and shortens the product life while also reducing the life. The product volume; 2, AC-LED uses AC power, can abandon the cost of the drive power, significantly reduce production costs, improve product cost performance; 3, no need to use AC-DC converter, eliminating power conversion energy consumption, more Energy efficient.
Gaogong LED reporter: Please tell us a little about the working principle of AC-LED? Zhao Kun: Compared with the traditional DC-LED power supply mode, AC-LED does not need to be AC/DC converted, and can be directly plugged into 220V (or 110V) AC. The key technology of AC-LED light source is the special arrangement and combination technology of LED in chip design or packaging. At the same time, the diode characteristics of LED PN junction are used as rectification, and multiple light-emitting units are integrated on one chip through semiconductor manufacturing process, that is, high power. The single-chip LED technology and the interleaved matrix arrangement process form a bridge circuit, so that the AC current can be double-conducted, thereby achieving the purpose of illumination. As shown in Fig. 1, the left figure is a schematic diagram of the conduction light emission of the upper half of the AC-LED, and the right small figure is the schematic diagram of the conduction light of the lower half of the AC-LED. The LED chip emits light after being connected to the AC, so it only needs two leads to be connected to the AC power source to be able to emit light.
Figure 1
Gaogong LED Reporter: At present, the biggest problem with AC-LED is that AC-LED is prone to stroboscopic due to the periodic variation of AC voltage. Excuse me, how does Xinli Light Source solve the stroboscopic problem?
Zhao Kun: The AC-LED flashing frequency is 50HZ. It is impossible to observe the "stroboscopic" by the naked eye. The reason why the AC-LED stroboscopic problem should be solved is because the long-term work under such high-frequency flicker will cause fatigue in the human eye. , causing damage to vision.
The reason for the stroboscopic LED is that the LED has a corresponding turn-on voltage. Only when the voltage reaches its turn-on voltage will it emit light. The AC voltage is periodically changed. When the LED is connected to the AC power, a stroboscopic phenomenon occurs, as shown in Figure 2. Show.
Figure 2: Luminous characteristics of AC LEDs
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