LIMITED CURRENT CIRCUIT OF DIGITAL INVERTER FOR LIQUID CRYSTAL DISPLAY BACKLIGHT

摘要

PROBLEM TO BE SOLVED: To provide an LCC (Limited Current Circuit) of a digital inverter performing a shutdown processing within a standard time by inducing striking lower than a limited voltage set in the standard by using an MCU (micro controller unit) capable of controlling a voltage/current applied upon striking of the digital inverter applied to an LCD backlight. SOLUTION: The LCC of a digital inverter for an LCD backlight comprises: a transformer which raises an AC power supplied from the inverter to an AC voltage of a high voltage for lighting a lamp; a voltage/current detection unit for detecting at least one of the current and voltage supplied to the lamp from the transformer; an A/D converter for converting the detected voltage/current value of analog to a digital value; and an MCU which induces an LCC check point after the start of a striking process, compares at least one of the output current value and voltage value from the transformer with a preset reference value on the basis of an output signal of the A/D converter and then shuts down the inverter when the output current value or voltage value is determined to be abnormal. COPYRIGHT: (C)2008,JPO&INPIT