A family of transformer-less single-switch dual inductor high voltage gain boost converters is proposed in this Project. The proposed configurations can realize high voltage gain with low voltage and current stresses. The voltage gain of the proposed converters is analogous to the switched inductor boost converter; therefore, the proposed boost converters are suitable for high gain applications. The proposed family of converters has low component counts and reduced voltage stress on devices compared to three typical transformer-less single switch high voltage gain converters including switched inductor boost converter, quadratic boost converter and quasi-Z-source boost converter. Moreover, the current stress of the front-end diode and the rear-end inductor is also relatively low. Therefore, the conversion efficiency is enhanced while keeping the cost low. The operation principles and steady-state characteristics analysis of the proposed converters under the inductor current continuous conduction mode (CCM) and continuous bidirectional conduction mode (CBCM) are discussed in detail. A prototype of 300V, 250W/100kHz is developed to verify the performance of the proposed converter.