Source voltage control switching circuit

H - Electricity – 04 – N

Patent

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Details

H04N 5/63 (2006.01) H02M 3/335 (2006.01) H04N 7/20 (2006.01)

Patent

CA 2073700

In a BS (direct broadcast by satellite) timer recording mode, a constant voltage diode for controlling 18 V is directly inserted in a power circuit. Alternatively, a delay circuit is inserted at the input of a switching circuit for switching the constant voltage diode, thus absorbing the switching time difference between 140-V control and 18-V control. Therefore, the secondary side output voltages can be prevented from being increased, and the output voltages can be stabilized both in the BS timer recording mode (light load powering) and in the television mode (maximum load powering).

Dans un mode d'enregistrement programmé d'émissions diffusées par satellite, une diode à tension constante servant à commander une tension de 18 V est insérée directement dans le circuit d'alimentation. Autre possibilité, un circuit de retardement peut être inséré à l'entrée d'un circuit de commutation pour commuter la diode à tension constante et absorber ainsi la différence de temps de commutation entre la commande de la tension de 140 V et celle de 18 V. On peut ainsi empêcher les augmentations des tensions de sortie secondaires et les tensions de sortie peuvent être stabilisées dans un mode d'enregistrement programmé d'émissions transmises par satellite (faible charge) et dans le mode de télévision (charge maximale).

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