As shown in the figure, the picture tube filament protection circuit, the resistance of the TV picture tube filament in the cold state is much smaller than that in the hot state, so when the power is turned on, the filament instantaneous inrush current is large, and the filament will suddenly light up, thus Affect the life of the picture tube. In addition, the TV regulated power supply generally does not have a protection circuit. When the adjustment tube breakdown or the base voltage regulator is disconnected, the DC voltage of the rectified output is all added to the picture tube filament, which increases the filament burn-off. Danger.
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