LED backlight redundant backup circuit and control method thereof

The invention discloses an LED backlight redundant backup circuit and a control method of the LED backlight redundant backup circuit. An FPGA controller is connected with a first path linear constant current source and a second path linear constant current source, the first path linear constant current source is connected with a first path LED lamp array and a first path backlight working state feedback circuit, the second path linear constant current source is connected with a second path LED lamp array and a second path backlight working state feedback circuit, the FPGA controller is connected with the first path backlight working state feedback circuit and the second path backlight working state feedback circuit, and the FPGA controller is further connected with an upper computer through serial communication. The invention further discloses the corresponding control method. The two paths of backlight circuits alternatively work, and only one path backlight circuit works at one time; the backlight working state feedback circuits detect the working state, and therefore the backlight redundant backup function is achieved; feedback is increased, so that controllability of the redundant circuit is improved, and the redundant circuit is simple and reliable.