Voltage regulation for capacitors
Look at something called a "shunt" regulator. These are regulators that go in parallel to your load to clamp voltage to a maximum level. Zener diodes are a good example (although crude, and gennerally not the best in terms of regulation). For this reason shunt regulators are sometimes represented with a zener diode, even though they may be more complex. 







simulate this circuit &ndash; Schematic created using CircuitLab