No Need Adapter 🤔 WiFi Router UPS Making with Transformer
No Need Adapter 🤔 WiFi Router UPS Making with Transformer | Full Circuit Diagram & Connection
Do you want to make your own WiFi Router UPS that runs even when there is no electricity? In this post, I will show you how to build a Transformer-Based WiFi Router UPS. The best part is – you don’t need any extra adapter.
With this DIY UPS, your WiFi Router or ONU will keep working during power cuts, giving you uninterrupted internet. Let’s go step by step.
🔋 Why a WiFi Router UPS is Important?
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Prevents sudden internet disconnection during load-shedding.
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Protects router/ONU from voltage drops.
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Very cheap and easy to build at home.
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Works with most routers (5V / 9V / 12V).
⚡ Working Principle
The system works with Automatic Changeover:
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When AC mains is available → Router runs from the transformer power + battery charges.
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When mains goes off → Battery power automatically takes over.
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Output voltage is regulated by LM2596 & XL6009 modules for stable DC output.
This ensures zero delay switching, so your internet never disconnects.
🛠 Components List (Serially)
To build this UPS, you’ll need:
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Transformer (Step Down, 220V AC to 12V AC)
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4x Diodes (6A10) – for bridge rectifier
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Electrolytic Capacitors:
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1000µF / 25V
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220µF (multiple)
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470µH inductor filter
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Schottky Diodes (1N5822) – fast switching
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MOSFET IRF9540 – auto changeover
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Voltage Regulators:
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LM2596T-ADJ (Buck Converter)
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XL6009 (Boost Converter)
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Resistors – 10kΩ, 330Ω, 220Ω, 1kΩ
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Switches (SW1, SW2, SW3)
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LED Indicator – power status
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Battery Connector – 12V Lead Acid / Li-ion Pack / LiFePO4
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Output Connector – for WiFi Router
📐 Circuit Diagram (Detailed Explanation)
🔹 1. Transformer & Rectifier Section
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Transformer converts 220V AC → 12V AC.
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4x 6A10 Diodes create a bridge rectifier.
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1000µF capacitor smooths the DC voltage.
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LED + Resistor (R1 = 1kΩ) indicates power ON.
🔹 2. Battery & Auto Changeover Section
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Battery is connected via Connector BATTERY.
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IRF9540 MOSFET + Diodes (1N5822) handle automatic switching.
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When mains ON → Router runs from transformer + battery charges.
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When mains OFF → MOSFET switches and battery powers router.
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No manual switch needed, it’s automatic.
🔹 3. Voltage Regulation Section
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LM2596T Buck Converter (U10) regulates stable 5V / 9V output for router.
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XL6009 Boost Converter (U14) ensures correct voltage if battery discharges.
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Capacitors (C2, C3, C4, C5) filter the output to prevent ripple.
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Inductors (470µH) improve efficiency.
🔹 4. Output & Switching
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SW1, SW2, SW3 used as optional ON/OFF and mode selection.
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Final output is connected to Router Power Port.
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You can adjust LM2596 / XL6009 to get exact voltage (5V, 9V, or 12V) as required by your WiFi Router.
🔌 Connection Guide (Step by Step)
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AC Input → Connect transformer primary to 220V AC mains.
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DC Output from Rectifier → Goes to MOSFET + Battery Charger.
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Battery → Connect to BATTERY terminal (12V).
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LM2596 & XL6009 → Adjust to your router’s voltage.
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Router Output → Connect router DC jack to UPS output.
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LED → Indicates UPS working mode.
🖥 Testing & Output
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Step 1: Power ON the circuit → Router should run, battery charging.
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Step 2: Switch OFF AC mains → Router continues running on battery instantly.
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Step 3: Measure output voltage → Ensure it matches router requirement.
✅ Advantages of This Design
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Works without adapter (direct from transformer).
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Automatic changeover (no manual switching).
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Provides stable DC output (no fluctuations).
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Low cost DIY project with easily available parts.
✅Video Reference:
$5 10pcs 1-2 layer PCB Order from PCBWay: https://www.pcbway.com/?from=technology4power🎯 Conclusion
This Transformer-Based WiFi Router UPS is the perfect DIY project if you want uninterrupted internet during power cuts. It’s simple, reliable, and works without any adapter. Just connect it to your router, and enjoy zero downtime internet.
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