H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/105
H04N 3/18 (2006.01) H04N 3/20 (2006.01)
Patent
CA 1074437
MALFUNCTION DETECTING APPARATUS FOR USE IN A CRT DEFLECTION CIRCUIT ABSTRACT OF THE DISCLOSURE Apparatus is provided for preventing the generation of an excessively high voltage by the high voltage circuit of a CRT device, such as a television receiver, thereby avoiding the danger of producing injurious X-ray radiation and further minimizing the potential fire hazard attributed to such an excessively high voltage. A flyback transformer is connected to a resonant capacitor and is driven by a switching device synchronized with horizontal scanning pulses so that flyback pulses are produced during the normal retrace intervals in the horizontal-deflection. A relatively low voltage power supply is coupled to the switching device to apply an operating voltage thereto. A first detecting circuit is coupled to the flyback transformer for detecting a high frequency component included in the flyback pulses in the event of a malfunction of the resonant capacitor, such as a disconnection of that capacitor, which high frequency component causes an excessively high voltage to be produced by the high voltage circuit. A second detecting circuit is coupled to the flyback transformer for detecting a high flyback pulse level that is produced when the operating voltage applied by the low voltage power supply exceeds a pre- determined level. In the event that the first detecting circuit detects the presence of a high frequency component or the second detecting circuit detects a high flyback pulse level, a switch is actuated to control the CRT deflection circuit, thereby reduc- ing the level of the flybacks pulses, and thus the level of the high voltage produced by the high voltage circuit. -i-
263701
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