CRT vertical scanning circuit with a low power standby

Details CRT vertical scanning circuit with a low power standby CRT vertical scanning circuit with a low power standby

2006-04-04

2006-04-04

Philogene, Haissa (Department: 2828)

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

C315S408000, C315S411000, C315S399000, C348S805000

Reexamination Certificate

active

07023149

ABSTRACT:
The invention concerns a scanning circuit, comprising a power supply providing a negative voltage on a first terminal (Tdown), an intermediate voltage on a second terminal (Gnd) and a positive voltage on a terminal of a switch (S), the other terminal of the switch being connected to a third terminal (Tup), a control circuit (6) supplied by connections to the second and third terminals, a differential amplifier receiving a positive and a negative input signal provided by the control circuit, a power amplifier controlled by the differential amplifier, both amplifiers being supplied by connections to the first and third terminals, a deflection coil (Ly) connected between the output of the power amplifier and the second terminal, biasing means setting, when the switch is open, the output of the differential amplifier so that the possible current paths through the power amplifier between the deflection coil and the first terminal are cut.

REFERENCES:
patent: 3628083 (1971-12-01), Holmes et al.
patent: 3816792 (1974-06-01), Spencer, Jr.
patent: 4617591 (1986-10-01), Inoue et al.
patent: 5170132 (1992-12-01), Lucas et al.
patent: 6239561 (2001-05-01), Allender

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