Voltage Doubler
- Practical Electron Microscopy and Database -
- An Online Book -
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This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
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A voltage doubler is an electronic circuit that produces twice the input voltage by charging a capacitor from the input voltage. Figure 3256 shows one of the simplest circuits, composed of a transformer, a capacitor, and a diode. We assume that with AC input the capacitor is always charged at +10 V due to the diode. When A (green) is at +10 V, then B (red) is at +20 V because the transformer and capacitor are in series, while B is at 0 V when A is at -10 V. Therefore, the output voltage at B is twice the voltage at A. Note that the voltage at B is still an AC voltage.

Figure 3256. (a) One of the simplest voltage doublers, and (b) The ideal output voltage (B in red) as a function of input voltage (A in green) with the voltage doubler in (a).

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