Abstract: A diode-split high voltage transformer for a television receiver includes a coil form having a plurality of axially aligned cells. The cells are arranged in groups and are separated by fins. Partial windings are individually arranged in the cells. A plurality of diodes is arranged about the edge of each fin and and substantially normal to the of the form. The partial windings and the diodes are alternately connected in series. Each of the fins includs a ramp-shaped recess tangentially extending from the fin edge to the bottom of the cell adjacent to the fin to provide space allowing the winding wires to stay clear of the partial windings.

Abstract: A television receiver has a switched mode power supply for regulating an output voltage, including a power transformer having a primary winding coupled to an unregulated voltage via a power transistor. The power transistor is controlled by pulses from the output of a controller. In order to sweep the base-emitter charge from the power transistor in order to end collector-emitter conduction, the base of the power transistor is coupled to the output of the pulse generating controller via a capacitor in parallel with at least one diode. During a pulse from the controller, the capacitor is charged to a voltage equal to the forward biased drop across the diode(s). At the end of a pulse at the output of the controller, the voltage across the capacitor provides a negative voltage at the base of the transistor, thus sweeping out the base-emitter charge and sharply turning the transistor off.