WSEAS Transactions on Circuits and Systems
Print ISSN: 1109-2734, E-ISSN: 2224-266X
Volume 24, 2025
Tapped Inductor Charge Pumps
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Abstract: Charge pumps are used to produce a high output voltage from a low input voltage for supplying loads that need very low power, such as sensors or ionization of the air. A second application is charging a capacitor out of a battery and discharging it for supplying a flashlight, an electro shocker or similar applications. Three charge pumps with a tapped inductor are treated. All three circuits consist of a tapped inductor (two magnetically coupled windings), an electronic switch, a diode, and a capacitor. The first is based on the Buck-Boost converter and produces a high negative voltage. When a high positive voltage is necessary, the position of the components has to be changed. The advantages of these converters are that the voltage stress of the electronic switch is reduced and the control is very simple. No inrush occurs when the charge pump (types I and III) is connected to a stable input source. The operation of the three charge pumps is explained in detail by calculations and the u-Zi diagram. The considerations are proved by LTSpice simulations.
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Pages: 176-183
DOI: 10.37394/23201.2025.24.20