Holding circuit

H - Electricity – 04 – N

Patent

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Details

H04N 9/64 (2006.01) G11C 27/02 (2006.01)

Patent

CA 2055858

A holding circuit used in a pedestal level clamp circuit of a color television receiver. By using base current of a transistor as charging current of a capacitor, a large time constant is obtained. Also, in case the voltage lower than the reference voltage is held, base current of the transistor is used as discharging current to discharge slowly. Furthermore, though a charging transistor of the capacitor must be a PNP type and a discharging transistor must be an NPN type, it is designed not to be influenced by the difference in current amplification factors of the two types. 19

Circuit bloqueur utilisé dans un caleur de décollement du noir d'un téléviseur couleur. En utilisant le courant de base d'un transistor comme courant de charge d'un condensateur, on obtient une constante de temps de valeur élevée. En outre, lorsque la tension inférieure à la tension de référence est maintenue, le courant de base du transistor est utilisé comme courant de décharge pour assurer une décharge lente. En outre, bien qu'un transistor de charge doive être de type PNP, et un transistor de décharge de type NPN, le circuit est conçu pour ne pas être influencé par la différence des facteurs d'amplification de courant des deux types.

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