# 2 MOSFET DC to AC Inverter Design (Wireless Charging)

For one of my projects, I am trying to create a wireless charging station for a LiPo battery. For my input, I'm taking the standard 120 Vrms, 60 Hz voltage source I get from a outlet. From initial testing, I deduced that my battery requires around 20V, 1A DC to charge safely. I know a LiPo battery is a constant current, variable voltage load, but I just wanted to just accomplish the goal of outputting the specified DC wave.

I've broken up my project into multiple parts: standard 120 Vrms to DC rectification using a bridge rectifier and low pass filter (from simulation 500 uF seemed to be sufficient), a DC to AC inverter generating a frequency of 1800 Hz, homemade induction coils to act as the transformer across an air gap (due to flux losses, a 1:1 turn ratio seemed to show 4:1 voltage relation testing with 12 volts input), and another AC to DC rectification on the secondary side. I'm using a frequency of 1800 Hz because I've empirically measured that to be the resonant frequency of the induction coils, and provides the best flux linkage.

So the problem is the inverter. I'm very inexperienced with power electronics and a little lost on how to design such an inverter. My initial design was to use 2 power MOSFETs using a gate signal from an Arduino Uno microprocessor, in order to chop up the DC voltage coming out of the rectifier into an AC wave. Then, I can low pass filter it with a 500 uF capacitor to output a sine wave to the transformer. However, all designs I've tried simulating doesn't seem to be compatible with my design. Can someone point me to a design of a simple 2 MOSFET DC to AC inverter using a variable frequency gate input?

• Welcome to EE.SE. Could you supply us with a block diagram at least. You have AC available but want to build a DC inverter to get AC? These are dangerous voltages and you need to show us some skills, else we are helping you to injure yourself. – Sparky256 Nov 14 at 1:17