The design showing below depicts a simple yet very effective 4 MOSFET n channel full bridge IC 555 inverter circuit. The 12 V DC from the battery is first converted into 310 V DC through a ready made DC to AC converter module. This 310 VDC is applied to the MOSFET full bridge driver for converting it into a 220 V AC output.
The 4 N channel MOSFETs are appropriately bootstrapped using individual dide, capacitor and BC547 network.
The switching of the full bridge section is executed by the IC 555 oscillator stage. The frequency is around 50 Hz set by the 50 k preset at pin#7 of the IC 555.
Working Details
This circuit is simple direct system. First part is a 12V battery connected to a ready-made electronic box on top. That top box is a high frequency converter module bought from eBay. It takes 12V DC from battery and converts it into high voltage 310V DC running at 50 kHz.
From that top converter module, the high voltage 310V DC wire goes down to a big filter capacitor and feeds the main switching bridge below. That big capacitor of 100uF 400V stores the high voltage safely.
Now look at the left side. You will see is one 555 timer IC setup making 50 Hz pulses. This 555 IC acts like the main brain or oscillator for timing. The signal comes out from pin 3 of the 555 chip.
That 50 Hz signal goes into two different transistor channels to push the power transistors. On both sides there are IRF430 or IRF740 power MOSFETs arranged in bridge style.
Small BC547 transistors are used as phase splitters or inverters to control the gate signals properly so that top and bottom MOSFETs switch alternately without shorting the high voltage supply.
When these MOSFETs switch ON and OFF according to the 555 timer timing, they chop the 310V DC into an alternating AC shape. Then that AC output goes through a bridge rectifier made of 1N5408 diodes or directly out as 220V AC output lines to run appliances without using any heavy iron transformer in the main low frequency section.
Parts List
| Component | Description / Value JPG |
| Battery | 12V Battery |
| DC-DC Converter | Readymade 12V to 310V DC 50 kHz Converter Module (from eBay) |
| IC1 | NE555 Timer IC (50 Hz Oscillator) |
| Resistors (Timing) | 18k resistor, 50K potentiometer, 10k resistor |
| Capacitor (Timing) | 1nF capacitor |
| Resistors (General) | 1k resistors (multiple locations), 10k resistors |
| Diodes (Signal) | 1N4148 switching diodes |
| Capacitors (Filter/Decoupling) | 10uF 50V capacitors, 100uF 400V bulk filter capacitor |
| Transistors (Drivers) | BC547 NPN transistors |
| Transistors (Power Switches) | IRF740 N/P-channel power MOSFETs |
| Bridge Rectifier Diodes | 1N5408 power diodes |
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