1kW Pure Sine Wave Inverter

In this project, I will show you how to make a full sinusoidal inverter using EGS002 SPWM driver board, which can convert the 12V DC to 220V AC with 50/60Hz pure sine wave. You can use this inverter to power household appliances up to 1000 watts during emergency situations when electricity is not available. It can also be highly useful for camping and outdoor work where electricity is unavailable, and you need to operate tools like drills, grinders, soldering equipment, and more.

Let's make it!

Components List for 1kW Pure Sine Wave Inverter

The following components are required to make this powerful inverter:

Name	Value	Qty.
P1: Inverter Driver Module	EGS002 SPWM	1
Q1 to Q12: N-Channel MOSFET	IRF3205	12
Q13: NPN Transistor	TIP31	1
D1 to D4: Diode	1N4148	4
BR1: Bridge Rectifire	1N4007	4
R1 to R4: Resistor	10Ω, 1/4W	4
R5 to R8: Resistor	10kΩ, 1/4W	4
R9: Shunt Resistor	0.01Ω	1
R10, R11: Resistor	100kΩ, 1/4W	2
R12: Resistor	2.2kΩ, 1/4W	1
S1: NTC Temprature Sensor	10kΩ	1
POT1: Resistor	10kΩ	1
C1: Capacitor	100uF, 25V	1
C2: Capacitor	10uF, 25V	1
C3: Capacitor	470nF	1
C4: Capacitor	2.2uF, 350V	1
C5: Capacitor	2.2uF, 25V	1
T1: UPS Transformer	7V /220V, 500-1000W	1
U1: Voltage Regulator	IC 7805	1
F1: DC Fan	12V, 25mA	1
Heat Sink	Aliminium	1
Insulation Pads with Plastic Washers	Rubber/Plastic	6
Washers	Plastic	6
17 Header Pin	Female	1

1kW Pure Sine Wave Inverter Circuit Diagram

Schematic of the 1kw pure sine wave inverter circuit using egs002 spwm driver board is shown below.

The working principle of the EGS002 SPWM based inverter circuit is simple. The inverter circuit includes voltage, current, and temperature protection mechanisms, LED warning indicators, and fan control.

The main component of this inverter circuit is the EGS002 driver board, specifically designed for a single-phase sinusoidal inverter. It utilizes the ASIC EG8010 as the control chip and the IR2110S as the MOSFET driver chip.

This intregrated circuit board serves as a DC-DC-AC two-stage power converter system or a DC-AC single-stage low-power frequency transformer system. Its purpose is to boost the input voltage and generate a 50Hz (default) pure sine wave output with high accuracy and minimal harmonic distortion. This is achieved with the assistance of an external 12MHz crystal oscillator. The output voltage of the inverter circuit can be adjusted to 220V AC using the trimmer (POT1).

The driver board continuously measures the output load current through IFB pin for overcurrent protection detection. If, for any reason, the current exceeds the inverter's rated current, the module will shut down all power MOSFETs to reduce the voltage to zero. This function primarily serves to protect both the power MOSFETs and the connected load.

The NTC temperature sensor operates as a simple voltage divider circuit. Voltage varies in response to changes in NTC resistance, allowing us to obtain the corresponding temperature.

On the driver board, the overtemperature voltage threshold for the TFB pin is set at 4.3V. If the set voltage exceeds, it will trigger a shutdown of all power MOSFETs, reducing the voltage to zero. Once the overtemperature protection is activated, the driver module will re-evaluate the environmental temperature. If the voltage at pin TFB falls below 4.0V, the overtemperature protection will be turned off, and the inverter will operate normally. [If overtemperature protection is not required, this pin should be grounded.]

1kW Pure Sine Wave Inverter PCB Design

As you can see from the inverter schematic, it's evident that this is a complex circuit. Constructing it on a veroboard would be time-consuming, risk of shorts and unprofessional.

Therefore, I'm sharing a custom-designed 1kW pure sine wave inverter PCB Gerber file. You can download it and order it at very affordable price from PCBWay.

This is the Parts Placement Diagram for the Inverter PCB.

Important: Use Heatsink Insulation Pads with Plastic Washers for the Transistors (Q4,Q5,Q6), and (Q10, Q11, Q12).

I ordered the custom-designed PCB and the Musical Tesla Coil from www.PCBWay.com, and after a few days of waiting, I received the high-quality PCBs and the device.