Patent ID: 9750101
Date: 2017-08-29
CPC Classifications: G02F,G09G,H05B,Y02B

Claim:
1. A voltage boost driving circuit for LED backlight, comprising: a first power input port; a second power input port; a LED light bar; a positive boost circuit configured for providing a positive voltage to a positive pole of the LED light bar; a negative boost circuit configured for providing a negative voltage to a negative pole of the LED light bar; and a luminance controlling circuit configured for controlling the luminance of the LED light bar, wherein: the first power input port and the second power input port are respectively connected to the positive pole and negative pole of an external power supply; the positive boost circuit is connected between the first power input port and the positive pole of the LED light bar; the second power input port is connected to the ground; the negative boost circuit is connected to the positive boost circuit via the luminance controlling circuit, an output port of the negative boost circuit is connected to the negative pole of the LED light bar; wherein the positive boost circuit comprises a first coupling inductor; the negative boost circuit comprises a second coupling inductor; wherein the first coupling inductor and the second coupling inductor are respectively a primary coil and a secondary coil of a transformer, a first end of the first coupling inductor corresponds to a synonym end of the primary coil, a second end of the first coupling inductor corresponds to a homonym end of the primary coil, a first end of the second coupling inductor corresponds to a homonym end of the secondary coil, and a second end of the second coupling inductor corresponds to a synonym end of the secondary coil.