With the optimization and popularization of insulating and heat dissipating materials, non-isolated driving solutions are the trend of the times. The practical significance of higher efficiency, in addition to reducing energy consumption, has increased the use of LED lamp beads , reduced costs, and provided power to consumers. At present, China's LED standard has not yet been established. Because of the fierce competition in the market, the current 3W isolation drive solution can reach very low cost, but there are some problems.
Introduction to the current mainstream 3W drive power supply
3W LED bulb is one of the largest consumer demand markets. The current mainstream solution is 3×1W, each lamp is 3.3V/300mA, and the load is formed by three lamp bead series. The output load is 10V/300mA. . Since the grid voltage is rectified and the output load voltage is quite different, the most suitable way is to drive the buck through the flyback isolation. However, the isolation circuit has a complicated structure, many devices, high cost, low efficiency, low reliability, and is not suitable for mass production. In contrast to the isolated circuit, the non-isolated circuit has a simple circuit, uses fewer devices, is small in size, has lower cost, and is more efficient. As the market demands cost and efficiency, non-isolated circuits are on the stage in the field of low-power LED drivers.
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