Expedite Transformer Calculations for Flybacks

by Kirby Creel, Senior Design Engineer, Datatronics, Romoland, Calif. , Power Electronics Technology, Jan 01 2008

Focus:
Flyback converters can generate the high-voltage required to charge capacitors used in defibrillators, photoflashes, strobes, and ignition circuits. This article describes a step-by-step procedure for designing a flyback transformer that will charge a capacitor in a specified time period based on parameters such as frequency, voltage, pulse width, peak current, load capacitance, and efficiency. Equations given in this procedure provide insight into the influence of different variables. The article discusses the pros and cons of flyback converters and role of pulse in charging defribrillator and photoflash capacitors. With that as background, the procedure is described for designing a flyback transformer for a defibrillator capacitor. A test circuit for testing the transformer is also presented along with the charging waveform for this circuit.

What you’ll learn:

• How to design the flyback transformer for charging defibrillator capacitors and photoflash capacitors
• How to design high-voltage capacitor charging circuits

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