Switch mode power supply is a high-frequency electrical energy conversion apparatus that is widely used in many home appliances, industrial products, and military applications. In this study, a Flyback converter with LED as the load is modeled. To verify the system stability, a pulse-width modulated switching control circuit is evolved into a small-signal model with linear characteristics based on state-space averaging. Through MATLAB simulation results, it is shown that the current-control mode is superior to the voltage-control mode. A DC 46 V LED power output closed-loop feedback control switching power supply is fabricated, and the experimental and simulation results verify the superiority of the design. From this study, the current control mode is suitable for the use in flyback LED switching power supplies because the current mode method shows more stable characteristics with GM = 11.975 dB and PM = 46.073°.
Switch mode power supply is a high-frequency electrical energy conversion apparatus that is widely used in many home appliances, industrial products, and military applications. In this study, a Flyback converter with LED as the load is modeled. To verify the system stability, a pulse-width modulated switching control circuit is evolved into a small-signal model with linear characteristics based on state-space averaging. Through MATLAB simulation results, it is shown that the current-control mode is superior to the voltage-control mode. A DC 46 V LED power output closed-loop feedback control switching power supply is fabricated, and the experimental and simulation results verify the superiority of the design. From this study, the current control mode is suitable for the use in flyback LED switching power supplies because the current mode method shows more stable characteristics with GM = 11.975 dB and PM = 46.073°.
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