The 101V0 board generally operates through four primary stages to convert high-voltage AC into usable low-voltage DC: WEHO Electronics Input & Rectification: The circuit starts at the AC input terminals (Line and Neutral), protected by a and often a (Metal Oxide Varistor) for surge protection. A bridge rectifier converts the AC input into a high-voltage pulsating DC. Filtering: electrolytic capacitor
| 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 | wannien 101v0 power supply schematic
Over-Voltage (OVP), Over-Current (OCP), and Short-Circuit Protection (SCP) Troubleshooting Common Power Supply Failures The 101V0 board generally operates through four primary
: High-value resistors (usually 100kΩ to 470kΩ) that provide the initial "kick" to the PWM controller can drift out of spec, causing a "no start" condition. 3. Sourcing Documents 3. Sourcing Documents