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Power Supplies for LED Driving by Steve Winder

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CHAPTER 9 Fly-Back Converters

A traditional fly-back converter uses an inductor with at least two windings (really, this is a transformer). Consider two windings; one is the primary, which is connected to the input power supply and a switch to ground; the other is the secondary, which is connected to the load. The circuit is arranged so that magnetic energy is stored in the inductor during the time that the switch is on, when current increases in the primary winding. When the switch is off, the magnetic energy is released by current flowing out of the secondary winding. This is shown in Figure 9.1.

The energy release is the ‘fly-back’, so called because in early television sets with a cathode ray tube, a transformer winding was used to deflect ...

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