Switching Power Supply Circuit Diagram. Buck converter operation as shown in fig. The diagram below shows a partial schematic of a 450 watt atx power supply.
Note that most schematics circulating on the internet depict old style psu with bipolar transistors and without pfc. Its construction is typical for a modern computer psu with mosfet switches and active power factor correction pfc. On the portrayed power supply the circuit used was a stps30l30ct supporting up to 30 a.
The schematic of my switching power supply you can see below.
Switching mode power supply. On the portrayed power supply the circuit used was a stps30l30ct supporting up to 30 a. The above dc is applied to an oscillator configuration comprising a high voltage transistor or a mosfet rigged to a well dimensioned small ferrite transformer primary winding. Transformer design edit any switched mode power supply that gets its power from an ac power line called an off line converter 33 requires a transformer for galvanic isolation.
