Abstract:

In order to apply LED lighting in photovoltaic power generation, other new energy generation, grid power supply, and multi-energy joint power supply scenarios, an active clamping inhibit leakage voltage spike snubber multi-port bidirectional driver structure is proposed, which can realize the grid-side power supply and photovoltaic power and other multi-energy power supply to adapt to a variety of lighting scenarios. The operating principle and operating process of the proposed circuit are analyzed in detail.The steady-state operating characteristics of the proposed circuit in various operating modes are analyzed.The key parameters of the circuit are designed. Finally,the computer simulation are carried out with an AC grid input voltage range of 185~265 VAC, an output current of 2 A and an output power of 96 W is set up. In the AC grid power supply operating mode, the power factor is obtained to be 0.998, the THD is obtained to be 4.7%, and the efficiency of the proposed circuit is obtained to be up to 87.2% at full load. The computer simulation results and experimental results have been obtained to verify the effectiveness of the proposed circuit and its active clamping method.

Key words: LED lighting, power factor correction, bidirectional bridgeless flyback circuit, active clamping, stress