Isolated Boost Circuit, Backlight Module and Liquid Crystal Display Device Thereof

A backlight module, comprising a isolated boost circuit which comprises a voltage input terminal, a driving signal unit, a transformer, and a controllable reverse isolation circuit;

• wherein, the transformer comprising a primary coil and a secondary coil, the voltage input terminal connected to the dotted terminal of the primary coil, the opposite terminal of the primary coil connected to a 01 terminal of the controllable reverse isolation circuit, the dotted terminal of the secondary coil connected to a 02 terminal of the controllable reverse isolation circuit, and a 03 terminal of the controllable reverse isolation circuit connected to the driving signal unit;
• wherein, the controllable reverse isolation circuit comprising a second MOS transistor, inside which a first diode and a second capacitor are provided;
• one end of the second capacitor connected to the positive electrode of the first diode and the source of the second MOS transistor, which forms the 01 terminal of the controllable reverse isolation circuit;
• the other end of the second capacitor connected to the negative electrode of the first diode and the drain of the second MOS transistor, which forms the 02 terminal of the controllable reverse isolation circuit;
• and the gate of the second MOS transistor provided as the 03 terminal of the controllable reverse isolation circuit.

A liquid crystal display device, comprising a liquid crystal panel and a backlight module which provides a light source to the liquid crystal panel;

• the backlight module comprising a isolated boost circuit which comprises a voltage input terminal, a driving signal unit, a transformer, and a controllable reverse isolation circuit;
• wherein, the transformer comprising a primary coil and a secondary coil, the voltage input terminal connected to the dotted terminal of the primary coil, the opposite terminal of the primary coil connected to a 01 terminal of the controllable reverse isolation circuit, the dotted terminal of the secondary coil connected to a 02 terminal of the controllable reverse isolation circuit, and a 03 terminal of the controllable reverse isolation circuit connected to the driving signal unit;
• wherein, the controllable reverse isolation circuit comprising a second MOS transistor, inside which a first diode and a second capacitor are provided;
• one end of the second capacitor connected to the positive electrode of the first diode and the source of the second MOS transistor, which forms the 01 terminal of the controllable reverse isolation circuit;
• the other end of the second capacitor connected to the negative electrode of the first diode and the drain of the second MOS transistor, which forms the 02 terminal of the controllable reverse isolation circuit;
• and the gate of the second MOS transistor provided as the 03 terminal of the controllable reverse isolation circuit.