Abstract: The present invention relates to a full bridge class-D amplifier where one of the output terminals (27) is grounded, and which is arranged to be supplied by a floating power supply (1). Each amplifier switching leg (7, 15) is connected to the corresponding load terminal (25, 27) via a low-pass filter (29, 31), at least one of which comprises a capacitor (C1, C2, C3 or C4), connected between the load terminal and the positive or negative output terminal (3, 5) of the floating power supply.

Abstract: A digital switched-mode power amplifier including a dc power source (1) and two dc-to-dc converters arranged in a parallel configuration and arranged to operate in a switched-mode operation is disclosed. Each converter comprises a primary side (2a, 2b) with first switching means and a secondary side (5a, 5b) with second switching means. The primary sides (2a, 2b) are connected to said dc power source (1) and the secondary sides (5a, 5b) are connected to opposite ends of a load (6). Furthermore, each converter is provided with a transformer to obtain dc-isolation between said primary side (2a, 2b) and said secondary side (5a, 5b). The transformer comprises a primary winding (3a, 3b) arranged at the primary side (2a, 2b) and a secondary winding (4a, 4b) arranged on the secondary side (5a, 5b).

Abstract: An amplification device is disclosed providing a way of integrating a switch mode power supply and a class D amplifier (switch mode amplifier). This results in the usage of basically one magnetic component (1), one major energy storage element (4) and switches (20, 30) that are controlled in such a way that both the power supply function and the amplification function are achieved. In this way a cheap, small and highly efficient current configuration is achieved. This amplification device is especially useful in audio products.

Abstract: A digital switched-mode power amplifier including a dc power source (1) and two dc-to-dc converters arranged in a parallel configuration and arranged to operate in a switched-mode operation is disclosed. Each converter comprises a primary side (2a, 2b) with first switching means and a secondary side (5a, 5b) with second switching means. The primary sides (2a, 2b) are connected to said dc power source (1) and the secondary sides (5a, 5b) are connected to opposite ends of a load (6). Furthermore, each converter is provided with a transformer to obtain dc-isolation between said primary side (2a, 2b) and said secondary side (5a, 5b). The transformer comprises a primary winding (3a, 3b) arranged at the primary side (2a, 2b) and a secondary winding (4a, 4b) arranged on the secondary side (5a, 5b).

Abstract: An amplification device is disclosed providing a way of integrating a switch mode power supply and a class D amplifier (switch mode amplifier). This results in the usage of basically one magnetic component (1), one major energy storage element (4) and switches (20, 30) that are controlled in such a way that both the power supply function and the amplification function are achieved. In this way a cheap, small and highly efficient current configuration is achieved. This amplification device is especially useful in audio products.

Abstract: A high voltage transformer (Tr) includes a primary winding (Lp), secondary windings (Ls1, Ls2, Ls3), and diodes (Di) coupled between successive secondary windings. The polarity of the diodes and the secondary windings is selected such that the flyback voltages across each of the secondary windings are summed via conductive diodes during at least a part of a flyback period (Tf) for generating a high voltage. A damp-circuit (1) comprises a rectifier element, a load (L), and a further winding (Ls4) of the high voltage transformer. These elements are arranged with respect to one of the secondary windings such that the further winding and the one of the secondary windings form a capacitance (Cd) across the load. The diode (D) is non-conductive during the flyback period. In this way, electrical oscillations of the high voltage transformer are damped.

Abstract: The invention relates to an X-ray imaging system, comprising an X-ray image intensifier tube in which the electron-optical system can be adjusted to a number of different image formats. By making the image format increase or decrease visibly on the exit screen in the event of a change of image format, annoying visual adjustment effects are avoided and a patient can be continuously observed also in the event of a change of format. Because of the gradual high-voltage variation of the power supply for the electron-optical system, associated with a visible variation of the image format, the output resistance of the power supply circuit may be high. Furthermore, due to the gradual change of the mean intensity on the exit screen of the X-ray image intensifier tube, the control behavior of the automatic exposure control and the automatic gain control of the X-ray imaging system are influenced in a positive sense.