FIELD: electronics.
SUBSTANCE: invention relates to an overvoltage protection circuit, scheme of excitation of LED backlighting, including the circuit of protection against overvoltage, and to a liquid crystal display (LCD) with an LED lighting circuit. Result is achieved by fact that the overvoltage protection circuit includes a voltage boost circuit for boosting an input voltage into an output voltage in need and providing the output voltage to a load, voltage control module for controlling the voltage boost circuit to boost an input voltage into an output voltage in need and for providing the output voltage to the load, overvoltage protection module for monitoring a voltage of a positive terminal of the load to enable or disable the voltage control module, and an overvoltage adjusting module for monitoring an operation voltage of the load to adjust the overvoltage to regulate overvoltage.
EFFECT: technical result is an increase in the effectiveness of counteracting the occurrence of an abnormal situation during operation due to excessive actual operating voltage and preventing damage to parts due to delayed protection.
9 cl, 7 dwg
