Abstract: A communication network power supply method and apparatus. The method comprises: before supplying power to an electric load, at least two paths of input voltages being connected in series; and according to the rated power of the electric load, performing isolation transformation processing on the input voltages connected in series, so as to obtain a voltage required by the electric load.

Abstract: Polyphase alternating current power or direct current power rectified from polyphase alternating current power is used to drive a commonly-driven luminous body, or to separately drive adjacently installed individual electric-driven luminous bodies, so as to reduce pulsation of the light output.

Abstract: A control circuit of a light-emitting element comprises a rectifying unit (30), a switching element (38), a transformer (48) having a first winding (L1) which generates a magnetic field using a current controlled by switching of the switching element (38), a second winding (L2) which is magnetically coupled to the first winding (L1) and which generates a current flowing to an LED (102), and a third winding (L3) which is magnetically coupled to the first winding (L1) and which generates a voltage (Sfbk), and an averaging capacitor (32) which averages a voltage derived by superposing a voltage (Srec) rectified by the rectifying unit (30) and the voltage (Sfbk), and a voltage averaged by the averaging capacitor (32) is applied to the first winding (L1), so that light is emitted from the LED (102).

Abstract: The invention relates to a circuit arrangement with a piezoelectric transformer having two electrodes arranged on the primary side of the transformer and such a piezoelectric transformer itself. Piezoelectric transformers of this type are used, for example, for the power supply or control of lamps or electron tubes. For controlling such a piezoelectric transformer directly on the primary side by a most frequently available DC voltage, instead of an AC voltage as is customary, according to the invention a DC voltage source is connected to the electrodes and a switching device is provided for interrupting the supply of voltage to at least one electrode, the positions of the switching device being dependent on the state of expansion of the primary side of the transformer. The switching device is thus periodically closed and opened, the applied DC voltage is thus interrupted periodically.

Abstract: An AC operated glow lamp having a cathode electrode and a pair of anode electrodes driven from a capacitively ballasted autotransformer that provides phase inversion so as to enable a full wave rectification of the discharge current thus operating in a DC regime from an AC line. The double anode lamp and ballast circuitry provides for rapid lamp starting as well as continuous cathode heating during lamp operation.

Abstract: A push-pull generator with a driver stage and a push-pull output stage. A parallel connection of a resistor (R3, R4) with a control transistor (T3, T4) is provided in the base line of each output stage transistor. In the push-pull output stage, resistors (R1, R2) are provided at which a voltage drop is caused by the output stage current. Depending on the magnitude of the voltage drop the control transistors (T3, T4) located parallel to the resistors in the base lines are either activated or blocked.