Device providing a regulated alternating voltage source for a power supply from a mains alternating current source

1. A device for producing from an alternative current network source a direct current voltage source with regulation to provide a power supply for discharge tubes without returning spurious signals to the voltage source and without significant voltage loss, such device comprising means for providing a sinusoidal voltage in a circuit comprising said direct current voltage source (2, 2c, 2d), a switch (7) with its control (7, 7b) for chopping such voltage, at least one resonating circuit (winding 4a-capacitor 5) associated with at least one impedance (winding 6), such switch (7), such resonating circuit (4a, 5) and such impedance (6) being connected in series to the terminals of said direct current voltage source and at least one reactive element (winding 4b) connected to the control (7b) of switch (7) and responsive to the operational variations caused by the use of such device adapted to interfere on at least one regulation means (14, 15, 16), the device being characterized in that, in order to regulate and stabilize the discharge and absorb phenomena resulting from brutal overloads or short-circuits, said circuit feeds a load connected in series with at least one self-inductance (25), itself connected in series with at least one winding (4a or 4d) of said circuit. L'invention consite à disposer d'une source de tension continue, à découper cette tension par un interrupteur (7), à la mettre en forme sinusoïdale au moyen d'un ensemble d'impédances (4a, 5, 6), à détecter et à s'opposer à des variations de fonctionnement par action de moyens combinés (4c, 14, 15, 16) sur le découpage. Application aux alimentations de puissance et notamment à l'alimentation haute tension des tubes à décharge à cathode froide.