Abstract: The autonomous power supply for observation device with capacitive-effect electrooptical cells includes a low-voltage power source, clock or synchronization circuits, switches and circuits processing the clock signals or synchronization to control circuit creating intermittent high voltage.

Abstract: A controlled supply device for a capacitive load with high voltage signals includes a circuit that produces an alternate low voltage control signal, an input capacitor which displays a capacitance which is much lower than that of the capacitive load, a non-linear high voltage element comprising an active tripole with a control dipole, where one of the poles of the control dipole is connected to the input capacitor while the other pole of the control dipole is connected to the output capacitive load, and a quick low leak, low capacitance diode which is connected between the two poles of said control dipole so as to comprise a closed circuit with the latter which accepts a current that flows in only one direction under normal operating conditions. The device enables real time control of the high voltage signal that is applied to the capacitive load.