🛠️ Make a 150W IPS at Home | DIY Mini IPS Inverter | EST Ex

In this blog post, we will guide you step by step to build a 150W inverter using the SG3525 PWM controller and IRF3205 MOSFETs. This inverter can efficiently convert 12V DC from a battery into 220V AC, which can be used to power household appliances like lights and small fans.

👉 What You’ll Learn in This Video:✔️ How to design a 150W IPS circuit✔️ Choosing the right battery & transformer✔️ Step-by-step assembly & wiring✔️ How to test and troubleshoot your IPS

🏆 W hy Build This DIY IPS?

✅ Portable & lightweight for home & outdoor use✅ Affordable & easy-to-build with common components✅ Rechargeable battery system for long-lasting backup

📌 Required Components:

🔹 SG3525 PWM Controller IC🔹 IRF3205 MOSFETs (x2)🔹 Step-up Transformer (12V-0-12V to 220V, 150W)🔹 18650 Li-ion Battery Pack (12V, 10Ah recommended)🔹 Electrolytic Capacitors (2200µF, 16V, and 100µF, 50V)🔹 Resistors (1KΩ, 10KΩ, 100Ω, 220Ω)🔹 Diodes (1N4007, FR107)🔹 Heat Sink for MOSFETs🔹 Wires and Connectors🔹 PCB or Breadboard for testing

⚡ Power Output: 150W🔌 Voltage: 12V DC to 220V AC

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🛠️ Step-by-Step Guide to Build the Inverter

Step 1: Design the PWM Control Circuit

Connect the SG3525 IC with timing resistors and capacitors to set the frequency (~50Hz).

• Connect the SG3525 IC with timing resistors and capacitors to set the frequency (~50Hz).

Use a 1KΩ resistor to limit the gate current of IRF3205 MOSFETs.

• Use a 1KΩ resistor to limit the gate current of IRF3205 MOSFETs.

Connect a 100Ω resistor at the output for stability.

• Connect a 100Ω resistor at the output for stability.

Step 2: Connect the MOSFETs

Place the IRF3205 MOSFETs in parallel for higher current handling.

• Place the IRF3205 MOSFETs in parallel for higher current handling.

Attach a heat sink to prevent overheating.

• Attach a heat sink to prevent overheating.

Ensure proper gate drive signals from SG3525.

• Ensure proper gate drive signals from SG3525.

Step 3: Step-up Transformer Wiring

Use a center-tapped transformer (12V-0-12V to 220V AC).

• Use a center-tapped transformer (12V-0-12V to 220V AC).

Connect MOSFET drains to the primary winding.

• Connect MOSFET drains to the primary winding.

The secondary winding will output 220V AC.

• The secondary winding will output 220V AC.

Step 4: Connect the Battery Pack

Use a 12V, 10Ah Li-ion battery pack.

• Use a 12V, 10Ah Li-ion battery pack.

Add a fuse (10A) and a switch for safety.

• Add a fuse (10A) and a switch for safety.

Step 5: Testing & Output Measurement

Connect a multimeter to check voltage levels.

• Connect a multimeter to check voltage levels.

Attach a 100W bulb as a test load.

• Attach a 100W bulb as a test load.

Observe proper AC output (220V, 50Hz).

• Observe proper AC output (220V, 50Hz).

🏆 Final Testing & Performance

✔ Test the inverter with small loads first (10W-50W).✔ Check the AC waveform using an oscilloscope.✔ Ensure the heat sink is adequate for MOSFETs.✔ Avoid overloading beyond 150W to protect the components.

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📌 Applications of This Inverter

🔹 Emergency Power Backup for small devices.🔹 Powering LED bulbs and small appliances.🔹 DIY Projects and Learning Purposes.🔹 Portable power supply for outdoor use.

⚠️ Safety Precautions

⚠ Ensure proper insulation to avoid short circuits.⚠ Do not touch high-voltage AC output while running.⚠ Use a fuse (10A) for safety.⚠ Ensure MOSFETs are properly heat-sinked.

🎬 Watch the Full Video Tutorial

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📢 Conclusion

This 150W inverter using SG3525 and IRF3205 MOSFETs is a great DIY project for learning about DC to AC conversion. With proper design and testing, it can provide a stable 220V AC output for powering small appliances. Try building it and let us know your results!