Patent ID: 7839376

Claim:
A time control circuit for a backlight inverter comprising: a first current source connected between a connecting pin and a power terminal, for supplying a pre-set first current; a second current source for selectively supplying a pre-set second current to the connecting pin; a capacitor connected between the connecting pin and a ground, wherein the capacitor is configured to be charged by either: the first current source, or the first current source and the second current source; a first comparator element for comparing a voltage of the capacitor at the connecting pin and a pre-set first reference voltage to control an initial startup time; a second comparator element for comparing the voltage of the capacitor at the connecting pin and a pre-set second reference voltage to control a soft start time; a current bypass controller including a current bypass path formed between the connecting pin and the ground, for connecting the current bypass path after the soft start time and blocking the current bypass path at an input of a protective signal; and a third comparator element for comparing the voltage of the capacitor at the connecting pin and a pre-set third reference voltage to control a shutdown time; wherein the first comparator element and the second comparator element are configured to output a high voltage level at power-on, a first period, during which the output of the first comparator element is transited from the high level to a low level, corresponds to the initial startup time, and a second period, during which the output of the second comparator element is transited from the high level to the low level, corresponds to the soft start time.