Lecture_13 - DC power supplies Notes from Teach Yourself...

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1 DC power supplies CHM6158C - Lecture 13 Mar 1 Notes from Teach Yourself Electricity and Electronics , by Stan Gibilisco
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2 Converting AC to DC On what principle does a transformer operate?
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3 Inductance P S P S N N V V = No. of coils What about the power? P = IV Unit: Henry s C s J s C s C J A s V H Ω = = = = 2 2 / / Many ways to express this unit 1 H = rate of change of current in a circuit is one Ampere per second, then the resulting electromotive force is one volt (Self-)Inductance = property in an electrical circuit, where a change in the electrical current through the circuit induces an electromotive force that opposes the change in current Due to creation of magnetic field
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4 Rectifier circuits More efficient, since current goes through same secondary circuit. Disadvantage: 4 diodes, which increases ………. “Center-tap” “Full-wave bridge”
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5 Voltage doubler circuit Notice number of winds Large capacitors and low resistors are used To build up high DC voltage To prevent diodes from burning out Concern that diodes cannot handle high currents
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Filters Remember RC circuit to filter voltage? What would the
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This note was uploaded on 07/30/2011 for the course CHM 6158 taught by Professor Polfer during the Spring '11 term at University of Florida.

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Lecture_13 - DC power supplies Notes from Teach Yourself...

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