The drains of the MOSFET transistors are connected to the +12V and -12V sides of mains transformer T1. I found that the MOSFETs need to be low Rds types such as the IRF540 MOSFET transistor or IRLZ44 MOSFET transistor. The MOSFET transistors are switched on and off by the square wave generated by the 555 timer. It can be set to 50Hz or 60Hz.Ī half-bridge MOSFET circuit is connected to the output of the 555 timer. The frequency is controlled by potentiometer R5. ![]() Transistor Q1 is an inverting transistor to give a 180º phase shift. The 50Hz oscillator is provided by the 555 timer. The circuit is outlined in the block diagram below. We are going to build a power inverter that takes its input power from a 12V battery, and outputs a 110V/230V AC current. Failure to do so could result in fire, injury, or even death. This project should only be built if you are trained to work with high voltage electronics. As an example, if the power inverter’s output were rated at 100VA and 110V, the output current would be 100VA / 110V = 0.9A.Ī WORD OF CAUTION: This project will involve working with high voltages. To do this, find the power inverter’s VA rating and voltage rating. Otherwise the power inverter might not be able to supply enough current to power your devices. It’s important to calculate the current that can be supplied by a power inverter. ![]() Power inverters range from simple DIY circuits using a few transistors and a transformer, to expensive commercial units using microcontrollers to generate PWM sine waves. Power inverters are also an important part of un-interrupted power supplies. They are also used in systems where the mains power is supplied by solar panels or wind generators. Power inverters are typically used to create a mains power backup from a set of 12V batteries in the event of a power outage.
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