charge pump

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charge pump

An electronic circuit that uses capacitors in series to increase the DC source voltage when needed. For example, in EEPROM and flash memory chips, charge pumps create a higher voltage to erase the floating gates before rewriting them. See voltage multiplier.


A Voltage Doubler Pump
These circuit diagrams show how switches S1 and S2 flip the voltage to the positive side of capacitor C1 to charge it to 5v and then to the negative side to multiply the voltage to 10v. The charge at C2 is available to another circuit (Vout) or to a resistance load (RL). If more voltage were required, the output of C2 would go to a third capacitor and so on. The switches are actually transistors, but the circuit symbols for the transistors are simplified in this diagram.
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References in periodicals archive ?
The "flying capacitor" used to transfer charge in a charge pump, as well as the input and output capacitors, need to deal with DC voltage biasing and are therefore also susceptible to this phenomenon.
Double Flying Capacitor Multicell Converter Based on Modified Phase-Shifted Pulsewidth Modulation.
There are three conventional multilevel inverter categories: (1) Diode-Clamped (Neutral Point Clamped) Multilevel Inverter (DCMLI) [5], (2) Capacitor Clamped (Flying Capacitor) Multilevel Inverter (CCMLI) [6], and (3) Cascaded Multilevel Inverter (CMLI) [7].
Typically, there are three classical topologies of the multilevel inverters such as the flying capacitor (FC) topology, cascade H-bridge topology, and neutral point clamped (NPC) topology [15-18].
[4], flying capacitor (FC) proposed by Meynard and Foch [5], and cascaded H bridge (CHB) proposed by Peng and Lai [6].
After an introduction and a discussion of multilevel topologies, they cover diode-clamped, flying capacitor, and cascade asymmetric multilevel converters.
The topologies which have been extensively studied and are available for multilevel voltage output are neutral point clamped (NPC), cascaded H-bridge (CHB) and flying capacitor (FC) converters[3-6].Diode-clamped inverter may be observed that using extra diodes in series becomes impractical when the number of levels n increases, requiring (n-1)(n-2) diodes per phase if all the diodes have equal blocking
STHD minimization, eleven-level flying capacitor inverter is employed in the simulations.
There are three fundamental Multi Level Inverter configurations namelyNeutralpoint clamped MLIs, Flying capacitor MLIs, and Cascaded H-bridge MLIs (CHB-MLI).
"Flying capacitor multilevel inverters with novel PWM method," Procedia Earth and Planetary Science, 1 (1): 1554-1560.
"Dynamic voltage restorer based on flying capacitor multilevel converters operated by repetitive control," IEEE Trans.