高压条（High tension bar）.docVIP

高压条（High tension bar） Working principle of high tension bar The low voltage direct current (generally more than ten V or 5V) on the motherboard is changed into high-frequency alternating current by switching chopping, and then the voltage is raised by a high frequency transformer to reach the voltage of the lamp tube. The power and signal of the high voltage board comes from the main board. Generally there are several lines connected with the main board: the power V+, the power supply G, the switch signal S, the brightness signal F (some of them are not). Application of high tension bar All equipment that relies on CCFL tube lighting, such as industrial control, LCD display, flat light display, Portable LCD terminal, POS, mobile DVD, digital photo frame, super book advertising box, display cabinet, industrial control equipment, etc. Action of high tension bar The function of the high tension bar is to produce alternating current high voltage (usually more than 1000 V), lighting the CCFL tube, and providing stable alternating current (2-8mA) to maintain the normal operation of the lamp. Status and Prospect of high pressure strip The backlight is mainly used in the LCD driver, LCD backlight mode in large size, is still dominant, but in recent years due to the introduction of the LED backlight, CCFL backlight has gradually disappeared in the traditional small size display market, along with the rapid development of LED backlight, after a few years, we have for having heard it many times high pressure will gradually withdraw from the stage of history. Common trouble of high tension bar 1, instant light immediately black screen The problem is mainly for the high pressure feedback circuit plays the role of lead, such as: high voltage feedback circuit protection, lead to problems resulting in no feedback voltage, the feedback current is too large, loose tube PIN and IC output is too high will lead to the problem, in principle, as long as the IC output, self-excited oscilla