Non-isolated Inductor-less Soft-Switching Bus Converter with Self-Driven

Description:

This invention proposes a simple topology for the first stage of non-isolated two-stage applications. The output inductor is eliminated. The magnetizing current is used to achieve ZVS for all switches. By choosing leakage inductance and output capacitance carefully, the turn-off current for the primary switch is very small and ZCS is achieved. Most importantly, the body diode loss is eliminated. A prototype is built to verify the theoretical analysis. Its efficiency is as high as 96% at 1MHz switching frequency. Compared with conventional PWM Buck, it can increase power density by 2.5 times.

Patent Information:

Title	App Type	Country	Serial No.	Patent No.	File Date	Issued Date	Expire Date	Patent Status
Power Converters Having Output Capacitor Resonant with Autotransformer Leakage Inductance	US Continuation-in-Part	*United States	11/094,434	7,254,047	3/31/2005	8/7/2007	3/26/2028	Issued