![]() BR1 is a bridge rectifier and C3 reduces the ripple of the rectified voltage. T1 is a common-mode choke for high-frequency noise suppression and waveform distortion prevention. C2 is a 100nF X2 capacitor to reduce the noise. R2 is a 10D561 varistor to provide high-voltage clamping and surge protection. F1 is a 500mA fuse to protect the board, PCB tracks, and wiring against unpredicted malfunction or short-circuit. Schematic diagram of the switching power supply (Altium) I used Altium designer to draw the schematic. As it is clear, the heart of the circuit is IC1, DK124. Order a fully assembled PCB board, without the transformer (FREE shipping).įigure 1 shows the schematic diagram of the 220V to 12V switching power supply. To test the power supply, I used Siglent an SDL1020X-E DC Load, an SDM3045X Multimeter, and an SDS1104X-E/SDS2102X Plus oscilloscope.ĭownload the Gerber or order 10Pcs high-quality boards here To get high-quality fabricated boards, I sent the Gerber files to PCBWay. The fast component search engine (octopart) allowed me to quickly consider components’ information and also generate the BOM. To design the schematic and PCB, I used Altium Designer 22. The PCB board is single-layer and all components are through-hole. The 220V Mains input has been protected using a MOV, an NTC, and a Fuse. The DK124 chip does not need any auxiliary winding or even an external startup resistor. I calculated the transformer to handle 12V at the output which can be easily modified to reach other output voltages as well. In this article/video, I designed a cheap AC-to-DC flyback converter using a DK124 IC that can deliver up to 18W continuously. In general, a Flyback converter is suitable for low-power applications, mostly below 100W. ![]() Flyback circuit is cheap and relatively easy to manufacture, therefore nowadays the majority of home or industrial appliances are powered using AC to DC Flyback converters. Flyback is the most common circuit topology to build galvanically isolated AC to DC or DC to DC converters.
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