Switching Power Supply by IC UC3843 + IRF740

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This is a Somewhat Experimental Circuit and I Especially designed this circuit for those persons that want to Dabble in Switching Power Supply Designs.

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This Circuit is based on a UC3843 Integrated Circuit. It does Not allow for Feedback control of the output voltage. The output voltage is totally determined by the “Turns Ratio” in Transformer “T1″. The Useable, Continuous Power Output is approximatey 25 watts or so. It could be used as a small Power Supply or a Battery Charger. In the proto I made, T1 has a Primary Inductance of about 1 mH. This requires 33 turns of 26 or 28 AWG Wire wound on the Bobbin First. (About One Layer if you use the 28 AWG, or a Bit over one layer if you use the 26 AWG) To get this 1 mH inductance using this core, also requires this ferrite to have a total gap of 0.005 inches. Or 0.0025 gap on each leg of the core. ** I can Pre-Gap this for you if you buy the core and bobbin from me. The Supply voltage is 117 Volts AC. When Rectified it produces a DC Supply of about 165 Volts. The Output Voltage is basically determined by the Turns ratio to the primary winding and to that 165 volts. To Get out 12 Volts, you will require about 2.4 Turns on the Secondary. I used 3 Turns, just to make it easier. This Winding is Wound Over top of the Primary, Using a Good Insulation layer between it and the Primary. …

Please read more :: http://www3.telus.net/chemelec/Projects/
Switching-Power-Supply/Switching-Supply.htm

This entry was posted on Tuesday, June 26th, 2007 at 3:51 pm and is filed under Power supply, switching power supply. You can follow any responses to this entry through the RSS 2.0 feed.