How to Invert 12V to 220V

In my previous post, I share to you guys about the 12V to 220V inverter schematic. This time I would like to share again about inverter, but this time it’s how to make 12V to 220V inverter. The main component of this small voltage converter to transform 12VDC to 220VAC is the CMOS 4047. We will used this CMOS 4047 to stable the multi-vibrator, at pins 10 and 11 will have a symmetrical rectangular signal (square wave) which is amplified by 2 Darlington transistors and finally reach the secondary coil of mains transformer (2x10V/60W).

Below are the videos presentations of the comparison between without load and with load.

Video Presentation 1 – without load

Video Presentation 2 – with load (light bulb)

With the help of P1 the output frequency can be adjusted between 50Hz to 400Hz. Although this is not part of any professional dc ac converter it can be used quite effective on some home appliances. Be aware that the output signal is square and not sine wave. So you cannot use it for powering TV, Laptops, monitors. Use it only for lighting, power tools and other non-expensive equipment.

Below is the circuit schematic of the converter in 60 Watts  from DC to AC.

Offline UPS (Uninterruptable Power Supply)

Creating your own offline ups circuit diagram is a good idea to secure your backup files is a really a wise idea. With the increasing daily support on networked data systems, the need for goofproof backup of power supply systems is now crucial.

UPS applications require a high-speed control MCU with multiple on-chip inverter and converter PWM control functions thus making the RL78/I1A an ideal choice for continuous commercial power supplies. Renesas delivers optimal solutions for UPS applications by providing a variety of semiconductor devices in addition to MCUs.

Below are the recommended products that you can use to your offline ups circuit diagram.

Recommended Products

Block	Semiconductor device	Recommended products	Features, etc.
Controller	MCU	RL78/I1A	Optimal for standby(offline) power systems. Timers, 5V operation, small package.
		R8C Family	Optimal for standby(offline) power systems. Timers, 5V operation, small package.
	EEPROM	R1EX24xxx Series	I2C bus interface. Optimal for power failure recording *1
		R1EX25xxx Series	SPI bus interface. Optimal for power failure recording *2
Step-down circuit	MOSFET	RJK60xxDPK	Low on-resistance, high-speed switching
Step-up circuit	MOSFET	RJK1003DPN	Low on-resistance, high-speed switching
Inverter	MOSFET	RJK40/50/60xxDPK	Low on-resistance, high-speed switching
	IGBT	RJH60DxDPP/DPK, RSH60FxDPK	low VCE(sat), FRD on-chip
PFC power supply	IGBT	RJH60DxDPP/DPK	low VCE(sat), FRD on-chip
	PFC IC	R2A20115, R2A20112, R2A20117, R2A20118A, R2A20104
Power supply, etc.	Photocoupler (standard)	PS23xx Series PS27xx Series PS28xx Series	High isolation voltage (5kVr.m.s.), 4p-LSOP, Ta=115°C High isolation voltage (3.75kVr.m.s.), 4p-SOP, Ta=110°C High isolation voltage (2.5kVr.m.s.), 4p-SSOP, Ta=110°C
	Photocoupler (IGBT drive)	PS93xx Series (6/8p-SDIP) PS94xx Series (16p-SOP) PS95xx Series (8p-DIP) PS99xx Series (8p-LSDIP)	High isolation voltage (5kV～7.5kVr.m.s.) 0.6～2.5A output High CMR (CMR≧50kV/μs)
	Op-amp	HA1630xxx series, μPC358
MCU peripheral	Reset IC	RNA519xx Series	Variable detection voltage

*1 I²C : Inter-Integrated Circuit
*2 SPI : Serial Peripheral Interface

12v to 220v Inverter Schematic

I would like to learn on how to invert 12V DC to 220V AC for 100 watts that’s why I’m doing my research about this because I’m not an Electronic or even an Electrical Engineer.  So I need more info on how to do it right to avoid accident. By doing the research I found some techniques and tutorials on how to do it easy without deep understanding on it.

In this 12v inverter circuit diagram I used the IC 4047 – IRF540 instead of transistor 2N3055 because it is a good idea power output for 100W from the transformer 2-3A. For the information for those who did not know yet that AC can’t be stored for future use but DC can be stored for future use in a battery. The stored DC can be converted back to AC by using power inverters. Below is the schematic diagram of the inverter that I made.

I also created a circuit diagram inverting 12V DC to 220V AC for 500 Watts.