A novel step-up DC-DC converter with a three-winding-coupled-inductor which integrates\na coupled-inductor and voltage-boost techniques for a distributed generation system is proposed\nin this paper. The two windings of the dotted terminal connection are charged by the input source;\nthe proposed converter utilized smaller turn ratios, and can achieve higher gain when the active\nswitch is turned on. The passive lossless clamped circuits not only can absorb the leakage energy,\nbut also lower the switch voltage stresses; additionally, the reverse-recovery problem of diodes can\nbe reduced to improve the system efficiency. Furthermore, the voltage stress of the output capacitor\nis reduced. The operating principle and corresponding theoretical analyses are discussed in detail.\nFinally, an experimental prototype with 50 kHz switching frequency, 40 V input voltage, 380 V output\nvoltage and 400W output power is set up to verify the validity of the proposed converter.
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