Circuit Diagram
Schematic Diagram for a Voltage Doubling Circuit (capacitor values are
in microF)
This is a
circuit that outputs a voltage Vout that is approximately twice the level of
the Vcc voltage.
The circuit
uses a 555
timer IC configured as an
astable multivibrator, i.e., it
generates a continuous square wave signal of a set frequency as long as its reset
pin (pin 4) is held high. This means that the 555 output toggles
between '1' and '0' continuously at the set frequency.
When the
circuit is powered up and the 555 output (pin 3) goes to logic '1' for
the very first time, its near-Vcc voltage level causes C3 to charge up
through D2 and also reach near-Vcc level. When the output goes to logic '0',
C2 charges from Vcc through D1, also to a near-Vcc level. When the
555 output goes back to logic '1' again, C3 may still have some (if not
most) of its charge left, and will allow to charge up to a higher level
since it is now effectively in parallel with the series circuit of the
555 level '1' output and the charged C2.
After several
cycles of C2 and C3 alternately charging, C3 will subsequently build up
a voltage level equal to almost twice the Vcc level. This C3 voltage
comes from the charge pumped in by the sum of the C2 voltage (near-Vcc)
and the 555 output voltage when it is at logic '1' (also near-Vcc). At
this point, the output Vout of the circuit will already be almost twice
the Vcc level.
Source http://www.ecelab.com/circuit-doubler.htm
Source http://www.ecelab.com/circuit-doubler.htm
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