Here is where the schematic becomes a troubleshooting tool.
Transformer Secondary (Center-tapped)
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+---[Schottky Diode 1 (Anode)]---(Cathode)---+
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[Center Tap]---(GND) +---[+12V Output]
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+---[Schottky Diode 2 (Anode)]---(Cathode)---+
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[LC Filter: 2x 1000uF/25V caps + 3.3uH inductor]
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[+12V @ 10A max]
Based on repairing dozens of generic 101v0-style units, here’s what fails without needing a diagram:
| Component | Value | Role | |-----------|-------|------| | F1 | T3.15A 250V (slow-blow) | Input protection | | BD1 | GBU806 (8A 600V) | Bridge rectifier | | C5, C6 | 220µF 200V (x2) | Bulk storage | | Q1, Q2 | MJE13007 (or 13009) | Switching transistors | | C14, C15 | 330nF 250V (x2) | Half-bridge capacitors | | T1 | EI33 or EE35 core | Main transformer | | D9, D10 | MBR20100CT (20A 100V) | Output Schottky | | U1 | TL494CN | PWM controller | | U2 | PC817C | Optocoupler | | U3 | TL431 | Voltage reference | | L1 | 3.3µH (yellow-white toroid) | Output filter inductor |
Use these steps:
The Wannien 101V0 employs an offline flyback converter topology. This topology was selected due to its cost-effectiveness, ability to provide galvanic isolation between the AC mains and the DC output, and its suitability for power ranges typically between 15W and 60W.
The schematic is divided into four distinct functional blocks:
Is the schematic "Good"?
Common Failure Points to Look For:
Summary: A functional but bare-bones schematic. It prioritizes BOM (Bill of Materials) cost reduction over safety and longevity. Use it for repairs, but do not use it as a reference design for new products.
This is a detailed technical post regarding the Wannien 101V0 power supply. This unit is commonly found in LED drivers, CCTV cameras, 3D printers (as a drop-in replacement for smaller Mean Well units), and industrial control boxes. wannien 101v0 power supply schematic
Because the Wannien 101V0 is a generic, mass-produced Chinese switching power supply, an official manufacturer schematic is nearly impossible to find. However, based on reverse engineering of the PCB (which uses the TL494 or KA7500B PWM controller), I have reconstructed a detailed reference schematic and analysis.
If you cannot find the original factory schematic, you must reconstruct it. Based on disassembled units, here is the block-level schematic breakdown.