Homemade high-power and high-efficiency inverter module circuit

This circuit is characterized by small size, high efficiency, small temperature rise within the rated power range, and a maximum output power of 500W. If you want to increase the power, just add parallel power field effect tubes, and you can use an external potentiometer to perform pulse width modulation. Component selection: The drive circuit is a dedicated pulse width modulation oscillator SG3524. Because it has few peripheral components and is simple to make, all components can be welded to the periphery using the most compact lap welding method, which can reduce the size. The key to the success of this circuit is the selection of the power field effect tube, and its parameters are preferably 50V

For 50A and above, IRF1010, 50V can be selected.

The 75A, 7, 8 feet of the resistor and capacitor determine the oscillation frequency. The frequency of this circuit is 250Hz, which is five times higher than the power frequency of 50HZ, so the size of the output transformer and the number of windings can be reduced accordingly. If you want to work at a power frequency of 50HZ, you can increase C appropriately.

The value of R can be matched with a standard power frequency control transformer, which makes charging easier. Since there is a blocking diode inside the power tube, as long as K is disconnected, 220V mains electricity can be directly input at the output end. The entire circuit can be glued on a 50X60X1 aluminum plate with AB glue. This module can be expanded into a UPS uninterruptible power supply. The voltage comparison circuit is connected to the second pin, and the voltage can be stabilized.