High-power drop resistors draw a small current directly from the high-voltage DC bus to initialize the PWM chip.
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.
Switching power supplies contain high-voltage capacitors that can hold a lethal charge
| Feature | Basic S36012 | Advanced S36012 (CC/CV) | | :--- | :--- | :--- | | | XL4016 only | XL4016 + LM358 op-amp | | Current sense | None (or simple fuse) | 0.01Ω shunt + amplifier | | Display | No | LED volt/ammeter | | Output adjustment | Single 10k pot | Two pots (Voltage + Current) | | Thermal protection | None | NTC thermistor to IC | s36012 power supply circuit diagram
After filtering, the AC voltage is fed into a full-bridge rectifier, typically composed of four discrete diodes or an integrated bridge rectifier package. This component converts the AC voltage into a pulsating DC voltage. This pulsating DC is then smoothed by a large, high-voltage "bulk" electrolytic capacitor (typically rated for 400V or higher). The result is a relatively smooth, high-voltage DC "bus" of approximately 155V when on 115V mains, or 310V when on 230V mains. This DC bus now serves as the input power source for the switching stage.
is a 47µH toroidal inductor (wound with 1.2mm wire to handle 12A). Saturation current must exceed 15A; otherwise, the inductor heats up and output ripple skyrockets.
The S36012 power supply circuit diagram consists of several key components: High-power drop resistors draw a small current directly
Understanding the S-360-12 Power Supply Circuit Diagram: A 12V 30A SMPS Deep Dive
Chopping the DC bus voltage into high-frequency pulses allows the power supply to utilize a incredibly small, lightweight ferrite-core transformer rather than a massive, heavy iron-core transformer found in conventional linear power supplies. 5. Isolation, Secondary Rectification, and Smoothing service manual - s-360-12 12v 30a power supply sch
: An adjustable reference zener diode checks the output line against a fixed internal value. This MOSFET is turned on and off at
The S36012 is a high-performance power supply unit designed to provide a stable and efficient power source for various electronic devices. The power supply circuit diagram is a visual representation of the internal components and their connections, which helps in understanding the working principle and troubleshooting the system.
This is a comprehensive feature article on the . This model is a ubiquitous, open-frame switching power supply commonly found in LED lighting, 3D printers, CNC routers, CCTV systems, and audio amplifiers.