TH21738EX - AKB machines using hot-start flashover protection. - Google Patents

Abstract

The receiver consists of a kinoscope (22), a driver amplifier circuit (24), and an integrated automatic bias circuit (AKB) (42). A soft start circuit (72) consists of a timer capacitor (84 ) Externally connected to the integrated circuit And a detector (46) in an integrated circuit, which limits the AKB current adjustment range while power-on, where the time is determined by an external capacitor. The capacitor (84) is separated from the integrated circuit to prevent its discharge by Protection diodes of the IC, where the time constant of all AKB circuits is the same in both conditions Hot start And cold start conditions Therefore, unwanted values that are visible are avoided. While the power is on, such as black level and the shift in contrast during the warm-up of the kinoscope. Either a cold start or a hot start

Claims (1)

1.The AKB used with the kinoscope driver amplifier consists of an AKB control band arranged in an integrated circuit. And including the first leg in the connection With a current-sensing resistor in an amplifier circuit that drives the kinoscope It has a second pin for supplying AKB rectifier current to the kinescope driver amplifier. And has a third leg used to connect the collector The charge of an external circuit integrates into such an integrated circuit. The range control switch AKB is arranged in such an integrated circuit and is connected to the Point in the control circle To control the maximum value of the cardboard: