LED DRIVING APPARATUS AND DRIVING METHOD THEREOF

摘要

An LED driving apparatus and a driving method thereof, comprising a rectifier bridge (110), at least one LED lamp string (121), at least one LED lamp group (122), at least one P-type switch module (130), at least one N-type driving module (140) and a logic controller (150). The LED lamp string (121) is connected to the LED lamp group (122) in series. An anode of the LED lamp string (121) is connected to a positive output end of the rectifier bridge (110), and a negative output end of the rectifier bridge (110) is grounded. A cathode of the LED lamp string (121) is connected to an anode of the LED lamp group (122). The logic controller (150) is connected to the anode and the cathode of the LED lamp string (121) through the P-type switch module (130). The logic controller (150) is connected to a cathode of the LED lamp group (122) through the N-type driving module (140). The logic controller (150) is also connected to a negative input end of the rectifier bridge (110). The logic controller (150) controls the N-type driving module (140) and the P-type switch module (130), so that when the voltage value of an input signal is increasing after rectification through the rectifier bridge (110), the number of LED lamps that are turned on in a long LED lamp string increases accordingly; when the voltage value is decreasing, the number of LED lamps that are turned on in the long LED lamp string decreases accordingly, improving efficiency of the driving apparatus and making integration in a chip easy.