Wannien 101v0 Power Supply Schematic <WORKING - 2024>

TECHNICAL REPORT: Analysis of the Wannien 101V0 Power Supply Schematic

Document Reference: WNN-101V0-SCH-REV[X] Subject: Switch-Mode Power Supply (SMPS) Topology and Component Analysis Analyst: [Your Name/Title] Date: October 24, 2023 wannien 101v0 power supply schematic

4. If you’re troubleshooting without a schematic

Use these steps:

• Check: fuse, bridge diode, main cap voltage (~310–340V DC)
• Measure VCC on the PWM controller (~12–18V during operation)
• Test optocoupler (PC817) and TL431 on secondary side
• Look for burnt resistors, cracked transformer, or shorted output diode

Measurement and testing workflow (practical)

1. Document nominal output(s) and current rating printed on the module.
2. Inspect and perform continuity/isolation checks.
3. Connect to an isolation transformer or use a bench supply for DC variants.
4. Power with current limiting; monitor inrush and idle current.
5. Measure DC outputs under no load, light load (10–20% rated), and full load if safe to do so.
6. Record ripple (scope) and transient response to load steps.
7. Thermal run: operate at expected load for 1–2 hours and observe temperatures.
8. Perform EMI spot checks (if required) and validate against system sensitivity.

Stage 1: Input EMI Filtering and Rectification

• Components: Fuse (F1), NTC Thermistor, X/Y capacitors, Common mode choke (L1), Bridge rectifier (D1-D4 or a single GBU package).
• Function: AC mains enters, is filtered for electromagnetic interference, then converted to high-voltage DC (~300V DC).