Programmable device for setting a receiver for entertainment electronics

Free oscillating blocking converter - has circuit for voltage control and current limiting with switches and transformer

A d.c. voltage source, a first resistor, the switching transistor switching path and a transformer winding, are connected in series while the transformer feed-back winding is in the transistor control circuit; the switching path of a thyristor is in parallel with the first resistor in series with the switching transistor control path, and the thyrisotr ignition electrode is connected to the collector of a comparator transistor which ignites the thyristor, and thurs blocks the switching transistor when the converter output voltage exceeds a specified value; voltage drop across the first resistor generated by the switching transistor current affects the ignition instant.

Circuit arrangement for a regulated flyback converter power supply.

COPYING INSTRUCTIONS AND COUPLING WITHOUT SPA STABILIZATION

Power supply units

Video recorder

A video recorder is made compatible for one of the previously used systems, for example a VHS system, and a qualitatively higher-grade digital system by providing on the usually existing head wheel (3) instead of a single video head which scans the entire video track at least two video heads (1a, 1b and 2a, 2b respectively), each of which scans only part of the video track, and by using these two video heads in digital operation to write in or read out in each case part of the data stream. The invention is suitable for home video recorders. <IMAGE>

Circuit arrangement for a regulated flyback switching power supply

Modern flyback-converters contain an integrated driving module (IS) which drives a switching transistor (7) on the primary side in a pulse-width modulated manner, controls the output voltage and furthermore also carries out some protective functions. In order to reduce both the external and internal circuit cost and, in particular, also to keep the number of pins in the drive module (IS) within limits, it is proposed to provide the control loop with an "active rectifier" (aGL). This rectifier receives a signal (URK), which is proportional to the secondary winding voltage (USW), via a control winding (13) on the primary side and produces control information therefrom during a flyback phase. For this purpose, it charges and discharges an external capacitor (17) when its input voltage (URK) is respectively less than or greater than a nominal value. The magnitude of the capacitor voltage (USt) determines the width of the driving pulses for the switching transistor (7). In one preferred embodiment, the charging and discharging rates of the capacitor (17) and the nominal value for the input voltage (URK) are independent of their pulse widths. …<IMAGE>…

Circuit arrangement for a freely oscillating flyback converter

Switching power supply featuring an output voltage protection

Consumer electronics receiver with programmable masking of broadcasts

Ein Empfänger der Unterhaltungselektronik mit Stationstasten, insbesondere ein Rundfunk- bzw. Fernseh-Empfänger, enthält für die programmierbare Ausblendung von Sendungen einen als Schaltuhr arbeitenden Mikroprozessor, der vom Benutzer bezüglich Ein- und Ausschaltzeit programmiert werden kann. A consumer electronics receiver with station buttons, in particular a radio or television receiver, contains a microprocessor that works as a timer for the programmable masking of broadcasts and which can be programmed by the user with regard to switch-on and switch-off times.

Circuit configuration for a controlled blocking oscillator converter switching power supply

A circuit configuration for a controlled blocking oscillator converter switching power supply includes an electric switch having a duty cycle. A transformer has a primary winding connected in series with the electric switch in the loop of a direct voltage source for alternatingly turning on the switch in a first operating phase and turning off the switch in a second operating phase, and a secondary winding outputting an alternating voltage from which a direct voltage is obtained. An integratable trigger circuit is connected to the switch for pulse width modulated switching of the switch. The integratable trigger circuit has a controller for receiving an input voltage being at least approximately proportional to the alternating voltage, for comparing the input voltage with a set-point voltage, and for deriving a further voltage in the form of the voltage of a capacitor from the difference between the two voltages. The controller includes a controlling rectifier for charging the capacitor when the input voltage is less than the set-point voltage and discharging the capacitor when the input voltage is greater than the set-point voltage in the second operating phase. A pulse width modulator is connected between the controlling rectifier and the capacitor for determining the duty cycle of the switch as a function of the further voltage.

Circuit arrangement for a free-running flyback converter switching power supply.

The invention relates to a circuit arrangement for a freely oscillating isolating transformer switched-mode power supply having a control device (IC) for the pulse-width-modulated triggering of an electrical switching element (T1). As control information, this control device (IC) receives, inter alia, on an input terminal (8) a zero passage detector signal (Uzero) and, on a further input terminal (1), a control voltage (UR), which is dependent on the output voltage (UA) of the switched-mode power supply. In order to ensure reliable operation of the circuit arrangement, even in the event of low power consumption and especially in the standby mode with only a few watts no-load power, it is proposed to provide, in addition to a capacitive coupling of the two input terminals (1, 8), a detector device (DE) with whose aid an internal reference voltage (Uref) of the control device (IC) can be reduced in the standby mode. By this means, the increase in the output voltage, which is undesired in the standby mode and is increased even further by the capacitive coupling, can effectively be avoided. <IMAGE>

CIRCUIT DEVICE FOR THE FREE SWING LOCKING CONVERTER POWER SUPPLY SUPPLY.

The invention relates to a circuit arrangement for a freely oscillating isolating transformer switched-mode power supply having a control device (IC) for the pulse-width-modulated triggering of an electrical switching element (T1). As control information, this control device (IC) receives, inter alia, on an input terminal (8) a zero passage detector signal (Uzero) and, on a further input terminal (1), a control voltage (UR), which is dependent on the output voltage (UA) of the switched-mode power supply. In order to ensure reliable operation of the circuit arrangement, even in the event of low power consumption and especially in the standby mode with only a few watts no-load power, it is proposed to provide, in addition to a capacitive coupling of the two input terminals (1, 8), a detector device (DE) with whose aid an internal reference voltage (Uref) of the control device (IC) can be reduced in the standby mode. By this means, the increase in the output voltage, which is undesired in the standby mode and is increased even further by the capacitive coupling, can effectively be avoided. <IMAGE>

Remote control for a consumer electronics receiver

CONNECTION DEVICE FOR CURRENT LIMITATION AND VOLTAGE STABILIZATION

Colour television receiver with automatic adjustment system

Switching power supply with protection for limiting of output voltage

In the event of disturbance, the output voltage of switched-mode power supplies in television receivers can increase so far that the permissible high voltage to the picture tube is exceeded. In this case, the X-ray limiting values are dangerously exceeded. In order to prevent this, it is proposed to provide an avalanche-resistant MOS transistor as a switching transistor in the switched-mode power supply. The switched-mode power supply is dimensioned such that a voltage safety of 10% to 20% is provided between the safe continuous operation of the switched-mode power supply and the destruction limit of the MOS transistor. <IMAGE>

Fernsteuerbare schaltungsanordnung

Disposicion de circuitos con mando a distancia.

LA DISPOSICION DE CIRCUITO CONTROLABLE A DISTANCIA ES UTILIZADA PARA CONEXION Y DESCONEXION AL MENOS DE UN CONSUMIDOR ELECTRICO CONECTADO A UNA FUENTE DE SUMINISTRO DE CORRIENTE A TRAVES AL MENOS DE UN INTERRUPTOR SEPARADO CONTROLABLE, QUE ES CONTROLABLE MEDIANTE UNA UNIDAD DE CONTROL REMOTO DEPENDIENDO DE LA ENTRADA DE INSTRUCCIONES DE CONTROL POR MEDIO DE UN GENERADOR DE CONTROL REMOTO PARA CONECTAR EL CONSUMIDOR DESDE UN MODO CARACTERISTICO DE OPERACION A UN MODO EN STANDBY. CUANDO EL MISMO U OTRO ELEMENTO DE AJUSTE ES ACTUADO DE NUEVO O SE ACTUA DURANTE UN TIEMPO MAS LARGO, UN ELEMENTO DE AJUSTE DISPARA UNA INSTRUCCION DE CONEXION QUE DESCONECTA COMPLETAMENTE EL CONSUMIDOR DE LA FUENTE DE SUMINISTRO DE CORRIENTE.

Fernseh-empfaenger mit infrarot-fernbedienung

Baugruppe in der Hochspannungsversorgung eines Farbfernsehempfängers

Vertikal-Ablenk-Baustein

Adapter fuer eine zeichenanzeigende kathodenglimmentladungsroehre

Halbleiter-Gleichrichter fuer Wechselstroeme hoher Spannung und Frequenz

Leuchtschild in wechselnden glitzernden farben.

Schaltungsanordnung für ein spannungsstabilisiertes Netzteil mit einem Sperrwandler

Adapter für eine zeichenanzeigende Katodenglimmentladungsröhre

Anzeigebaustein mit einer Ziffernanzeigeroehre und mit einer Ansteuerschaltung

Abgeschirmter Hochspannungs-Stabgleichrichter,insbesondere fuer Fernsehgeraete

Schaltungsanordnung zum Beseitigen von Verzeichnungen auf dem Bildschirm einer Farbfernsehbildröhre, insbesondere zur Konvergenz korrektur der Farbstrahlen in den Bildschirmecken

Digital styreenhed til en farvefjernsynsmodtager

Faergtelevisionsmottagare med automatiskt styrsystem

Fjernsynmottager med automatisk trimmesystem

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Fjernsynsmottager med automatisk trimmesystem samt fremgangsmaate til trimming av den

Faergtelevisionsmottagare med automatiskt styrsystem

Anordnung zur Gleichrichtung von Wechselstromen hoher Spannung und hoher Frequenz

Baugruppe in der Hochspannungsversorgung eines Farbfernsehempfängers

Anordnung zur Gleichrichtung von Wechselstroemen hoher Spannung und hoher Frequenz

Anordnung zur gleichrichtung von wechselstroemen hoher spannung und hoher frequenz

Halbleiter-Gleichrichteranordnung zur Gleichrichtung der Strahl-Beschleunigungsspannung einer Elektronenstrahl-Bildroehre, insbesondere Fernseh-Bildroehre

Schaltungsanordnung zum anlaufen eines schaltnetzteils mit strombegrenzung und spannungsstabilisierung