6.78-MHz Soft-Switching Single-Ended DC-DC Converter With Extreme Step-Up Voltage Gain

This article introduces a novel industrial, scientific, and medical band frequency dc-dc converter with an exceptional voltage gain of more than 100. The proposed converter combines a coreless planar tapped inductor with a Dickson charge pump, resulting in a design that offers significant advantages. Key contributions include achieving a 100-times voltage gain, enabling the direct elevation of a single lithium-ion cell voltage to dc-link levels. Additionally, the design minimizes switch voltage stress, maximizes energy density, and produces an extremely compact tapped inductor due to its 6.78 MHz frequency operation. Furthermore, this design offers the advantage of a common ground, making it adaptable for various applications. This article provides comprehensive mathematical analysis and detailed design guidelines, along with the hardware results demonstrating the converter's capability to convert a 4 V input to a 400 V output for output power of 32 W.