What is drive power

　　The LED driver horizontal adapter is a voltage converter that converts the power adapter supply into a specific voltage and current to drive the LED to emit light. Under normal circumstances: the input of the LED driver power adapter includes high-voltage power frequency AC (ie city power), low-voltage DC, and high-voltage DC, low-voltage and high-frequency AC (such as the output of an electronic transformer), etc. The output of the LED drive power adapter is mostly a constant current source that can change the voltage with the change in the forward voltage drop of the LED. The following will provide some knowledge about LED drive power adapters for those who are new to the industry.

　　1. What is the LED drive power adapter

　　The LED drive power adapter converts the power adapter supply into a specific voltage and current to drive the LED to emit light. Under normal circumstances: the input of the LED drive power adapter includes high-voltage power frequency AC (ie mains), low-voltage DC, high-voltage DC, Low-voltage and high-frequency AC (such as the output of an electronic transformer), etc. The output of the LED drive power adapter is mostly a constant current source that can change the voltage with the change in the forward voltage drop of the LED. The core components of the LED power adapter include switching controllers, inductors, switching components (MOSfet), feedback resistors, input filter components, output filter components, and so on. According to the requirements of different occasions, there are also input over-voltage protection circuits, input under-voltage protection circuits, LED open-circuit protection, over-current protection and other circuits.

　　2. Features of LED drive power adapter

　　(1) High reliability

　　Especially like the driving power adapter of LED street lamp, it is inconvenient to maintain and expensive to maintain when installed at high altitude.

　　(2) High efficiency

　　LED is an energy-saving product, and the efficiency of driving the power adapter should be high. It is very important for the heat dissipation of the junction of the power adapter installed in the luminaire. The efficiency of the power adapter is high, its power consumption is small, and the heat generated in the lamp is small, which reduces the temperature rise of the lamp. It is beneficial to delay the light decay of LED.

　　(3) High power factor

　　The power factor is the requirement of the power grid on the load. Generally, there are no mandatory indicators for electrical appliances below 70 watts. Although the power factor of a single consumer with low power is lower, it has little effect on the power grid, but the large amount of lighting used at night and too concentrated similar loads will cause serious pollution to the power grid. For LED drive power adapters of 30 watts to 40 watts, it is said that in the near future, there may be certain index requirements for power factors.

　　(4) Drive mode

　　Currently, there are two types: one constant voltage source for multiple constant current sources, and each constant current source individually supplies power to each LED. In this way, the combination is flexible, and the failure of one LED will not affect the work of other LEDs, but the cost will be slightly higher. The other is direct constant current power supply, which is the driving method adopted by "Zhongke Huibao", LED series or parallel operation. Its advantage is that the cost is a little lower, but the flexibility is poor, and it must solve the problem of one LED failure without affecting the operation of other LEDs. These two forms coexist for a period of time. Multi-channel constant current output power supply mode will be better in terms of cost and performance. Maybe it will be the mainstream direction in the future.

　　(5) Surge protection

　　The ability of LED to resist surge is relatively poor, especially the ability to resist reverse voltage. It is also important to strengthen protection in this area. Some LED lights are installed outdoors, such as LED street lights. Due to the initiation of the grid load and the induction of lightning strikes, various surges will be invaded from the grid system, and some surges will cause damage to the LED. Therefore, it is analyzed that the wall-mounted charger of "Zhongke Huibao" should have certain deficiencies in surge protection. As for the frequent replacement of power adapters and lamps, the LED drive power adapter must suppress the intrusion of surges and protect the LED from being damaged. The ability to damage.

　　(6) Protection function

　　In addition to the conventional protection functions of the power adapter, it is best to add negative feedback of the LED temperature to the constant current output to prevent the LED temperature from being too high; it must meet the requirements of safety regulations and electromagnetic compatibility.

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