Quote:
Originally posted by charliebrown
If the motors won't last too long with that current, imagine what will happen to the PCB 
Chuckster...
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Part of that design is that the charge pump only supplies the extra voltage to the motor ONLY, the PCB is ISOLATED from that extra voltage and runs off of its regulator and maintains standard voltage.
Using the same theory, does the person using an arc welder also have current flowing through them? Does the TV have to take the full flyback voltage through the entire circuit board? Does the person using the ESD shocker get shocked too? Its all about multiple grounds, current blocking, and isolation.
Look up some flyback and charge pump circuits and see how they work and find out for yourself.
Its a sound idea, a simple circuit, and is used everyday in your TV, your car ignition, even in the computer you are reading this on.