This is a single phase to 3 Phase Variable Frequency Drive (VFD) / Inverter Without using any Microcontroller.
It has two tasks:
1-Converting single phase power source into 3 phase source
2-Adjust the output frequency to control the speed of the induction motors
Input voltage range = 30V to 240V AC or 40V to 340V DC
Maximum Load = Depends on the Mosfets and size of the heatsink, it could be 1KW or less.
Output Waveform = Modified Sine Wave
Output Frequency range = 30Hz to 100Hz
*You can get wider frequency range (such as 1Hz to 1000Hz or more) by changing the timing resistors / capacitor of IC NE555, but i don't recommend you to do that because the motors could get damage at very low or very high frequencies.
You can connect this circuit to DC source such as solar panels or high voltage battery instead of AC source (mains voltage), but you need to use a DC fuse instead of AC fuse.
Parts list:
IC 4017 (2pcs)
IC IR2110 (3pcs)
IC NE555
IC 7805
Optocoupler PC817 (8pcs)
5mm LED (3pcs) different colors
Switching Power supply 12V 3W Hi-link HLK-PM12
Glass fuse 20mm 250V 5A (with holder)
Potentiometer 20K WH-148
Knob for the Potentiometer
Diode 1N4148 (30pcs)
Diode SF16 (3pcs) or any other high voltage fast diode
Bridge rectifier D35SB100
Resistor 1K 0.25 Watt (17pcs)
Resistor 4.7K 0.25 Watt
Resistor 10K 0.25 Watt (10pcs)
Resistor 27ohm 0.25 Watt (6pcs)
Capacitor 150uF 450V
Capacitor 100nF 400V (3pcs)
Capacitor 1000uF 16V (2pcs)
Capacitor 47uF 50V (3pcs)
Ceramic capacitor 100nF (7pcs)
Varistor 471K 10D (3pcs)
Mosfet 20N60M (6pcs) or any other high voltage n-channel mosfet
Heatsink for the Mosfets 100mm x 40mm (for very small loads not necessary! )
Terminal Connector HB-825 2P
IC Socket 8 dip
IC Socket 14 dip (3pcs)
IC Socket 16 dip (2pcs)
Power cord 250V 5A
Single phase and 3Phase circuit breaker (Optional)
Circuit:
You can download the Gerber file of this PCB from here:
https://drive.google.com/file/d/1bMOkg6V4iL3NSeCOGpPKsyzlTCvkOfbP/view?usp=sharing
Watch this video for more details: