Fuses for overcurrent, NTC for inrush current limit, MOV for overvoltage. 13009, 2SC3320, 2SC4106
Two large electrolytic capacitors (typically 200V 680µF) smooth the DC. A 115V/230V selector switch determines if these capacitors act in series or as a voltage doubler. 2. The PWM Controller (The Brain)
: Standard silicon diodes are too slow for high-frequency switching. The schematic maps out high-current Schottky barrier rectifiers (such as the MBR30100CT or equivalent) to instantly reconstruct the stepped-down pulses into a 12V DC signal. 5. Output Filtering, Feedback Loop, and Voltage Adjustment s36012 power supply circuit diagram
This is the "heart" of the switching power supply. The high-voltage DC bus is connected to a , which acts as a fast, electronic switch. This MOSFET is turned on and off at a high frequency, typically around 25 kHz for the S-360 series. The switching action is controlled by a dedicated PWM (Pulse Width Modulation) controller IC on the primary side.
A large ferrite core transformer that steps the high-voltage AC down to low-voltage AC. Because the frequency is so high, this transformer can be much smaller than a traditional 60Hz transformer. 4. Output Rectification & Filtering Fuses for overcurrent, NTC for inrush current limit,
Are you looking to a specific fault in your unit, or are you planning to modify the voltage output for a different application?
Unlike modern units that use a dedicated auxiliary chip, the S-360-12 often utilizes a self-oscillating starting design Startup Mechanism Because the frequency is so high
The TL494 controller IC monitors the 12V output and adjusts the pulse width (duty cycle) of the switching transistors to maintain a stable output voltage under varying loads. 3. Repairing and Troubleshooting the S-360-12