First, the emergence of LED has broken the design method and ideas of traditional light sources. At present, there are two latest design concepts. 1. Scenario lighting: It is the scene lighting proposed by Philips in 2008. The lighting is designed according to the needs of the environment. The scene lighting is based on the place, aiming to create a beautiful and beautiful lighting environment to set off the scene effect and make people feel. There is a scene atmosphere. 2. Emotional lighting: It is the mood lighting proposed by Kaisio in 2009, and the lighting is designed according to people's needs. Emotional lighting is based on human emotions, creating a mood-like lighting environment from a human perspective. The mood lighting is different from the scene lighting. The mood lighting is dynamic, the lighting method can meet the people's spiritual needs, making people feel the mood; and the scene lighting is static, it can only emphasize the needs of the scene lighting, but can not express Human emotions, in a sense, mood lighting covers scene lighting. Emotional lighting consists of four aspects: one is environmental protection and energy conservation, the other is health, the third is intelligent, and the fourth is humanization. Second, in order to do a good job in LED lighting design, we must work hard in the following aspects. 1. Do not use bipolar power devices. Doug Bailey pointed out that since bipolar power devices are cheaper than MOSFETs, they are generally about 2 cents, so some designers use bipolar power devices to reduce the cost of LED driving. Affect the reliability of the circuit, because as the temperature of the LED driver board increases, the effective working range of the bipolar device will shrink rapidly, which will cause the device to malfunction when the temperature rises, thus affecting the reliability of the LED lamp. The correct approach is To use MOSFET devices, MOSFET devices have a much longer lifetime than bipolar devices. 2, do not use 600V MOSFET withstand voltage 600V MOSFET is relatively cheap, many think that the input voltage of led lamps is generally 220V, so the withstand voltage 600V is enough, but often the circuit voltage will reach 340V, when there is a surge 600V MOSFET is easily broken down, which affects the life of LED luminaires. In fact, using 600V MOSFETs may save some cost but pay the price of the whole board. Therefore, "Do not use 600V MOSFETs. It is best to use a MOSFET with a withstand voltage of over 700V," he stressed. 3. Try not to use electrolytic capacitors. Do you want to use electrolytic capacitors in the LED driver circuit? At present, there are supporters and opponents. Supporters believe that if the temperature of the board can be controlled well, the purpose of extending the life of the electrolytic capacitor can be achieved in turn. For example, a high-temperature electrolytic capacitor with a life of 105 degrees and a lifetime of 8000 hours is selected, according to the estimated life expectancy of the electrolytic capacitor. “Every time the temperature is lowered by 10 degrees, the life is doubledâ€, then it has a working life of 16,000 hours in a 95 degree environment, a working life of 32,000 hours in a 85 degree environment, and a working life of 64,000 hours in a 75 degree environment, if Lower operating temperature, longer life! From this point of view, as long as the choice of high-quality electrolytic capacitors has no effect on the life of the drive power! Other proponents believe that the low-frequency flicker caused by the high ripple current caused by electroless capacitors will cause physiological discomfort to some people's eyes. The large amplitude of low-frequency ripple will also cause some digital camera equipment to appear poor. A brightly lit grid of flickering lights. Therefore, high-quality light source lamps still need electrolytic capacitors. However, opponents believe that electrolytic capacitors will naturally age. In addition, the temperature of LED lamps is extremely difficult to control, so the life of electrolytic capacitors will inevitably decrease, thus affecting the life of LED lamps. In this regard, the industry's well-known people explained that in the LED driver circuit input part can be considered without electrolytic capacitors, in fact, using PI LinkSwitch-PH can save electrolytic capacitors, PI's single-stage PFC / constant current design can let designers save Large-capacity capacitors, in the output circuit, high-voltage ceramic capacitors can be used instead of electrolytic capacitors to improve reliability. Some people design a two-stage circuit, using a 400V electrolytic capacitor at the output, which will seriously affect For the reliability of the circuit, it is recommended to use a ceramic capacitor for a single-stage circuit. For industrial applications that do not pay much attention to dimming functions, high temperature environments, and high reliability, electrolytic capacitors are not recommended for design. 4. Try to use integrated MOSFETs. If the LED luminaires are not designed to be very powerful, it is recommended to use LED driver products with integrated MOSFETs because the benefit of this is that the integrated MOSFETs have less on-resistance and generate less heat than discrete ones. The integrated MOSFET is a controller and FET together. Generally, it has a thermal shutdown function. When the MOSFET overheats, it will automatically turn off the circuit to protect the LED luminaire. This is very important for LED luminaires, because LED luminaires are generally small. And it is difficult to dissipate heat from the air. 5, try to use a single-stage architecture circuit If the efficiency of the PFC is 95%, and the efficiency of the DC / DC part is 88%, the efficiency of the entire circuit will be reduced to 83.6%! PI's LinkSwitch-PH device combines a PFC/CC controller, a 725V MOSFET, and a MOSFET driver into a single package, increasing drive circuit efficiency to 87%. However, such devices greatly simplify board layout design, up to It eliminates the need for 25 components used in traditional isolated flyback designs. The components that are omitted include high voltage bulk electrolytic capacitors and optocouplers. The LED two-stage architecture is suitable for older drivers that must use a second constant current drive circuit to allow the PFC to drive the LEDs at constant current. These designs are outdated and no longer cost effective, so in most cases it is best to use a single stage design.
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