H - Electricity – 02 – H
Patent
H - Electricity
02
H
350/109
H02H 3/20 (2006.01) H02H 9/04 (2006.01) H04N 3/20 (2006.01)
Patent
CA 1104249
12/6 HIGH VOLTAGE PROTECTION CIRCUIT ABSTRACT OF THE DISCLOSURE A horizontal fly-back transformer having a high voltage winding for generating high voltage pulses fed to the anode of a cathode ray tube is provided with a tertiary winding which in turn is connected to a rectifying-smoothing circuit, and a DC voltage in pro- portion to the anode high voltage is obtained from the rectifying-smoothing circuit. The DC voltage is divided by a resistor divider circuit and a division of the DC voltage is fed to the gate of a thyristor via a Zener diode which is turned on when the anode high voltage exceeds a critical voltage. A thyristor gate current flow concurrent with conduction of the Zener diode causes the thyristor to turn on so that the operating voltage of a horizontal oscillator circuit may be reduced until the horizontal oscillator circuit stops oscillating, thereby preventing generation of the anode high voltage. In addition to the aforementioned high voltage preven- tion circuit, a beam current detector circuit is connected in series with the high voltage winding and when the amount of beam current is below a predetermined value, detecting current dependent on the beam current is passed through a part of a resistor circuit. DC voltage for turning on the Zener diode and accordingly, the anode high voltage in proportion thereto depends on the beam current below the predetermined value so that an anode high voltage level at which the high voltage prevention circuit is operated is varied with the amount of the beam current.
301248
Gowling Lafleur Henderson Llp
Hitachi Ltd.
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