TH17653B - 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 turned on, such as black level and the contrast shift during the warm-up of the kinoscope Either a cold start or a hot start

Claims (4)

1.The AKB used with the kinoscope driver amplifier consists of: 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 In order to control the peak value of the aforementioned AKB rectification current, the switching threshold is arranged in the integrated circuit For control Range control switch, such a detector With the input side connected to the fourth pin of the aforementioned integrated circuit and The soft-start scheduling circuit is connected to the aforementioned fourth pin and is connected internally. Outside with the aforementioned integrated circuits And including RC networks and diodes for joint connection Go to the fourth leg of the said IC 2. The AKB as described in claim 1, where the said RC circuit is assembled. With a common connection that is connected to the first source of potential Through a resistor and connected with The second source of potential Through capacitors and where diodes are Is welded together at the anode of It went to the fourth leg. Of the IC and at its cathode to the said common point of the RC network. 3. AKB, as stated in claim 1, where the soft-start timer network circuit Such clay consists of Circuit joint A resistor is shared between the junction of the circuit and the first source of potential.The capacitor is co-connected between the junction of the circuit and the second source of the potential, and where the diode is shared between the fourth pin. As mentioned in the aforementioned circuit And the connection of such a circuit The diodes are polarized to prevent the discharge of the body. Such capacitors Go to the fourth pin of the aforementioned IC on the supply-to-pin voltage junction. The source of such an integrated circuit 4. AKB apparatus as stated in claim 3, where the diode is co-welded to the anode. Of it to the fourth leg of the said IC. And at its cathode to the said circuit joint Of such a soft start timing circuit