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DIY 150W IPS Making At Home with Auto Changeover System | Mini IPS 2025

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Are you looking for a reliable and efficient way to create an Automatic 150W IPS (Instant Power Supply) at home? In this guide, we will walk you through the step-by-step process of building a 150W IPS using two essential circuit modules.

Components Required:

1. Transformer (12V-0-12V, 10A)
2. Relay Module (12V, 10A)
3. Inverter Module (150W Square Wave)
4. Battery Pack (18650 Lithium Cells, 3.7V, 10A)
5. Diodes:

1. 6A10 (for rectifier bridge)

2. 1N4007 (for protection circuits)

3. Capacitors:

   1. 1000uF 25V (DC filtering)

   2. 880nF (for stability)

4. Resistors:

   1. 1KΩ (for LED power indicators)

5. MOSFETs:

   1. IRFZ44N (used in inverter circuit)

6. LEDs (for Power Indication)

7. Heat Sink (for MOSFET cooling)

8. Connectors & Wiring

Circuit Schematic

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This schematic illustrates the connection of components such as the rectifier bridge, capacitor filtering, relay switching, and battery backup system. The relay controls the automatic switching between AC mains and battery power, ensuring an uninterrupted power supply.

Step-by-Step Instructions:

Step 1: Understanding the Circuit Modules

1. The first module converts AC to DC and provides filtered DC voltage.

2. The second module, the inverter module, converts DC back to AC to power appliances.

3. A relay module is used for automatic switching between AC mains and battery.

Step 2: Assembling the Power Circuit

1. Connect the primary side of the transformer to the AC mains input.

2. The secondary side connects to a rectifier bridge made of 6A10 diodes, which converts AC to DC.

3. A 1000uF capacitor is used to filter the DC output.

4. An LED and 1KΩ resistor indicate power availability.

Step 3: Connecting the Relay Module

1. The relay module detects when AC power is available and switches accordingly.

2. When AC mains is present, the relay allows AC power to pass through.

3. When AC mains fails, the relay switches to battery backup.

Step 4: Connecting the Inverter Module

1. The inverter module receives DC voltage from the battery pack.

2. It converts DC to AC and powers the connected load.

3. Use IRFZ44N MOSFETs with a heat sink for better performance.

Step 5: Safety Precautions

1. Ensure proper heat dissipation for MOSFETs to prevent overheating.

2. Use thick copper wires for high-current connections.

3. Secure all connections with soldering to prevent loose contacts.

Practical Implementation

Below is an actual implementation image of the 150W IPS in action:

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Conclusion

This Automatic 150W IPS system is an effective backup power solution for small household appliances. It ensures that power remains available even during outages, making it a useful project for DIY enthusiasts.

If you found this guide helpful, don’t forget to share it, and let us know your thoughts in the comments!