Television power supply turn-on protection circuit

Claim 1

A television supply source with a fault protection comprising: a power supply that selectively operates in a power-up mode and in a shut-down mode, for generating in said power-up mode a normal operating level of a first supply voltage, wherein when said power supply is in said shut-down mode the level of said first supply voltage is lower than in said power-up mode, said power supply being responsive to power-up and shutdown control signals, respectively, for assuming said power-up and shut-down modes when said power-up and shutdown control signals are asserted, respectively; means for asserting said power-up control signal; a delay unit responsive to said power-up control signal for delaying said power-up control signal by a first interval having a predetermined length immediately following the time in which said power-up control signal is asserted to assert at the end of said first interval, a delayed power-up control signal that, in normal operation sequence, occurs after said first supply voltage is inside a predetermined normal operation voltage range; a detector responsive to said first supply voltage for generating an output signal when the level of said first supply voltage is outside said predetermined normal operation voltage range; and means responsive to both the delayed power-up control signal from said delay unit and said detector output signal for generating at an output terminal said shutdown control signal to cause said power supply to assume said shut-down mode when, at the end of said first interval, said first supply voltage is outside said predetermined normal operation voltage range, such that prior to the end time of said first interval, the signal at said output terminal is prevented from affecting said first supply voltage.