Abstract: A control circuit for controlling a brushless motor for a washing machine comprises AC main voltage, a phase-trimming circuit for trimming the AC main voltage and supplying the trimmed AC main voltage to the stator windings of the brushless motor, depending on a control voltage derived from a rotor position sensor of the brushless motor. The phase-trimming circuit changes the polarity of the trimmed AC main voltage so that a first polarity is supplied to a first stator winding and a second polarity is supplied to a second stator winding of the brushless motor.

Abstract: A circuit arrangement for controlling a brushless electric motor in which a control voltage derived from the rotor position is used to control the supply of line voltage to the stator winding of the motor. A control circuit which provides the control voltage is actuated several times over the areas intervals during one period of the line voltage, so that current pulses are applied to the stator winding for generating magnetic poles of opposite polarity to produce a rotating field with a frequency that is greater than the frequency of the line voltage.

Abstract: DC-converter with a switch-mode power supply, in particular for continuously operating magnetrons of the type generally used in microwave ovens. By a special tuning of an oscillating circuit (16,18) forming the control voltage for the switching transistor (9) it is achieved that the switching transistor off-time as well as its duty cycle can be varied within large ranges.

Abstract: A direct-voltage converter for supplying an appliance with an inductive component, in which two transistors are connected in series between direct-current voltage terminals and are made alternatively conductive in a push-pull mode by the first of two windings of a transformer. Two free-running diodes are connected in parallel to the transistors, and a junction between the two diodes supplies their output voltage. This junction is connected to a further junction between the transistors, through a third winding on the transformer. An electronic switch is connected in parallel with a fourth winding of the transformer, and is periodically made conductive by the output voltage through a pulse shaper with a switching pulse. The pulse shaper has two direct current circuit points which determine the peak value and relationship of currents flowing through the two transistors. An amplitude-comparison stage in the pulse shaper has inputs connected to the two circuit points.

Abstract: A DC-AC converter generates alternating current from direct current voltage for energizing a load with an inductive component. Two transistors connected in series are disposed in a so-called half bridge construction. Two free wheeling diodes are connected in parallel with the transistors and carry the current during the rest time of the transistors. The diodes are connected to the connection point of the two transistors through a control winding of a transformer. The control winding of the transformer controls the transistors. Therefore no additional driver circuit and no outside energy source are necessary for the control and commuting of the transistors of the DC-AC converter circuit.

Abstract: A high voltage transformer is provided for the voltage employed in the line deflection of an electron beam in a television receiver. The secondary high voltage winding is inserted into a case via an opening running parallel to the axis of the primary and secondary winding and is disposed in the case separate from the primary winding and is surrounded by a cast plastic resin. Preferably, the secondary winding body snaps into elastically supported protrusions disposed at the case. The plastic resin is filled into position through said opening. The high voltage connection is immersed into the plastic resin and is then led outwardly.

Abstract: The current which passes through the vertical deflector of a transistorized color television receiver is produced by a circuit comprising an active switch controlled and modulated at the line frequency and supplied by line retrace pulses delivered by the secondary winding of a line transformer. The voltage at the terminals of an assembly compring a capacitor in series with the vertical deflector has a constant sign which is independent of the current passing through the deflector. The same secondary winding of the line transformer supplies both the vertical scanning circuit and a rectifier circuit for producing a d.c. voltage, in particular for the supply of video amplifiers.

Abstract: Step-up switching regulator power supply device comprising, connected between the poles of a rectifier circuit supplied by an isolating voltage step-down transformer and loaded by a first filter capacitor, and inductance and the collector-emitter path of a first switching transistor of NPN type, a first diode whose anode is connected to the junction of the inductance and to the collector of said transistor and whose cathode is connected to a second filter and storage capacitor supplying a voltage at its output which supplies a horizontal deflection circuit of a television receiver.This horizontal deflection circuit which comprises in cascade a horizontal oscillator, a driver stage and an output stage, forms an integral part of the circuit controlling said first transistor and determines the repetition period of the switching, because it is started under an initial voltage slightly less than the unregulated input voltage of the device.

Abstract: Wave-chopping is performed by means of an active switch, said switch being unidirectional in voltage and bidirectional in current and connected in series with a secondary winding of the horizontal-scanning transformer. The secondary winding is connected in series with an inductance coil which is not coupled to the transformer and with a polarized capacitor, the output voltage being collected at the terminals of the capacitor.The power supply circuit is employed in video-frequency receivers having low dissipation.

Abstract: The switched-mode field-scanning circuit makes use of a load constituted by a vertical deflector, a measuring resistor and a connecting capacitor. The load is connected to the output of a circuit which generates a sawtooth signal by means of the line-scanning retrace signal and has a single unidirectional-voltage, bi-directional-current channel.The switched-mode field-scanning circuit is intended for use in transistorized video-frequency receivers.

Abstract: This circuit comprises a saw-tooth signal generating circuit having a single active switch monodirectional in voltage and bidirectional in current, controlled by a cyclic ratio control circuit connected, on the one hand, to a static servo-control circuit so as to ensure optimum operation of the active-switch circuit and, on the other hand, to a dynamic servo-control circuit so as to ensure conformity of the law of variation of the current in the deflector with respect to an S-corrected frame saw-tooth law.Such a circuit is used in transistorized videofrequency receivers.

Abstract: A regulated power supply device, in particular for a line sweep circuit in a television receiver, containing a chopper circuit (10) which contains in series an inductor (16) and a bidirectional switch (15), which is controlled and mounted in parallel with a capacitor (13), forming a resonant circuit with the inductor (16) when the chopper switch (15) opens. The inductor (16) contains a winding (21), called the power supply winding, of a transformer (20), called the line transformer, in which another winding (22), mounted in series with a reservoir capacitor (33), is connected in parallel with another bidirectional switch (35 and 36), which equips the line sweep output stage (30). The transfer of energy between the chopper circuit (10) and the output stage (30) is done through the windings (21 and 22) of the transformer (20) and its effect is to charge the reservoir capacitor (33) which feeds, apart from the output stage (30), the preceding stages of the sweep circuit (which are not shown).