| Author | Message | | | eric | | Posted: Sun Sep 10, 2006 9:25 am Post subject: Voltage boosting with inverters | | | | Site Admin Joined: 01 Jan 1970 Posts: 311 | G. Kleine
A ‘tree’ of inverters is highly suitable for boosting a voltage. That
in the diagram provides voltages that are whole multiples of the
input voltage by clock-driven charging of capacitors. The voltage
across the capacitors is added stage by stage to the input voltage.
Here, integrated circuits, IC2–IC7, each containing six inverters
are used. In each IC, except IC2, one of the inverters is connected
in series with the parallel combination of the other five.
Circuit IC1 is configured as a 50 Hz oscillator that controls
inverting driver IC2. A 10 μF capacitor interlinks the outputs of
IC2 and IC3. The bidirectional properties of the MOSFET output
of IC3 ensure that the voltage across supply terminals 7 and 14 is
identical to the input voltage. The increased voltage, equal to 2VIN,
is filtered by a 100 μF capacitor.
The outputs of IC3 and IC4
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