Contents
What kind of circuit is a charge pump?
PLL -Phase Lock Loop circuits. Thus, Charge Pumps are one of the applications in low power electronics, which generates high output voltage from a low input voltage. It is also named as flying capacitor converter. A single-stage charge pump circuit consists of a capacitor, a switch, or a diode connected to a voltage source.
What makes up a 3 stage charge pump?
A 3-stage charge pump consists of 3 charge pump stages which are cascaded one after the other along with a 555 IC timer. This construction increases the output voltage. A 555 IC consist of 8 pins, GND, Trigger, Output, Reset, Power Supply, Discharge Capacitor, Threshold, Control Voltage as shown below.
Which is an application for a charge pump?
The applications of the charge pump include the following. They are used in RS-232 level shifters, which drive both positive (+10V) and negative voltage (-10V) from 5V or 3V power supply rail. PLL -Phase Lock Loop circuits.
How is the output of a charge pump smoothed?
The pulsing nature of the higher voltage switched output is often smoothed by the use of an output capacitor. An external or secondary circuit drives the switching, typically at tens of kilo hertz up to several megahertz.
Can a charge pump invert the output voltage?
A charge pump not only produces high output voltage but can invert the output voltage. The circuit diagram is similar to a voltage doubler where the diode in the circuit is connected in reverse as shown below,
Can a charge pump be used in a voltage doubler?
Charge-pumped circuits similar to the voltage doubler can be built to provide higher voltages, usually integer-multiples of the input voltage (that is, 2×, 3×, etc.). There are also many integrated circuit solutions available for implementing this circuit.
How does a two stage charge pump work?
The below circuit shows the construction of a two-stage charge pump where the output of the first stage is given as input to the second stage and the output from the second stage is cascaded with the output load stage. This construction allows the pump to generate a high output voltage from the lower input voltage.
https://www.youtube.com/watch?v=LYKGuc6ibe0