Autonomous power supply for observation device, in particular with stereoscopic effect

An autonomous power supply for a steroscopic observation device including first and second capacitive-effect electro-optical cells, each cell containing an electro-optical material and each cell being controlled by a system of control electrodes which receive high-amplitude electrical signals, and including a clock system for generating clock signals to control periodic application of electrical control signals to said control electrodes, said power supply comprising:

• a low-voltage power source;
• circuit means for generating intermittent high voltage from said low-voltage power source, including an inductance coil having first and second coil terminals, said first coil terminal being connected to a first terminal of said low-voltage power source, and said second coil terminal being connected to a second terminal of said low-voltage power source through a controllable switching component, and a capacitor in connected parallel with said switching component;
• a set of switches connected between said circuit means for generating intermittent high voltage, and said system of control electrodes of said electro-optical cells;
• means for processing said clock signals, including means for processing said synchronization signals received by said means for receiving, and for controlling said switching components and said set of switches;
• means for receiving a carrier wave modulated by synchronization signals to control synchronized periodic application of said high-amplitude electric control signals to the electrode systems of said first and second electro-optical cells;
• and
• said set of switches comprising first and second controllable switches, each having first terminals connected intermediate said inductance coil and switching component and each having second terminals connected to respective electrodes of said first and second electro-optical cells, and third and fourth switches, each having first terminals connected to said first terminal of said inductance coil and each having second terminals respectively connected to said second terminals of said first and second switches, said first and fourth switches being controlled by said means for processing said clock signals to periodically close substantially simultaneously with the opening of said switching component every odd period of the control signal applied to the switching component, and said second and third switches being controlled to periodically close substantially simultaneously with the opening of said switching component during each even period of the control signal of the switching component, said first, second, third and fourth switches being closed for a time less than the time the switching component is open.