Television apparatus having kinescope spot burn protection...

H - Electricity – 04 – N

Patent

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Details

H04N 5/63 (2006.01) H04N 3/20 (2006.01)

Patent

CA 2061166

A source of switched supply voltage is applied to a potential divider and coupled to an output terminal via a capacitor. An output tap of the potential divider is coupled to the output terminal via the conduction path of a grounded base transistor. In operation the transistor (1) operates in an inverted mode for initially charging the capacitor, (2) operates in either a normal or an inverted mode for regulating a grid bias voltage at said output terminal for grid current flow of either direction relative to the output terminal and (3) operates in an isolation mode upon removal of the switched supply voltage whereby the capacitor applies a negative grid cut-off bias to the output terminal, said transistor in said isolation mode preventing discharge of the capacitor thereby providing a grid cut-off bias at said output terminal having an extended cut-off time constant due to the lack of any discharge path for the capacitor other than leakage.

Source de tension d'alimentation commutée qui est transmise à un diviseur de tension et couplée à une borne de sortie au moyen d'un condensateur. Une prise au secondaire du diviseur de tension est couplée à la borne de sortie grâce à une voie de conduction d'un transistor monté en base commune. Le transistor (1) fonctionne en mode inversé pour charger initialement le condensateur. Il (2) fonctionne en mode normal ou inversé pour régler la tension de polarisation de la grille, à la borne de sortie, pour la circulation du courant de grille dans un sens ou l'autre, en lien avec la borne de sortie. Il (3) fonctionne enfin en mode d'isolement à l'enlèvement de la tension d'alimentation commutée. Le condensateur exerce une tension de blocage de grille négative sur la borne de sortie, et le transistor en mode d'isolement empêche la décharge du condensateur. La tension de blocage de grille ainsi obtenue à la borne de sortie a un temps de blocage étalé qui est constant en raison du manque de voie de décharge pour le condensateur, autre que les fuites.

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