Fsp Technology Inc.

Fsp-powerland Technology Inc.

Shaobin Zhang

Ming Xu

Xiang Li

Juanjuan Sun

An LED backlight driving circuit including a boost circuit and a transformer current balance circuit is provided. The boost circuit provides a total current for n LED strings, and the transformer current balance circuit is coupled to the LED strings and includes n&#x2212;1 transformers. A first LED current-balance-circuit (CBC) includes a switching-transistor connected to a secondary-winding of a first-transformer, and an nLED CBC includes a switching-transistor connected to a primary-winding of an (n&#x2212;1)transformer. An i(1&#x3c;i&#x3c;n, n&#x3e;2) LED CBC includes a switching-transistor sequentially connected to a primary-winding of an (i&#x2212;1)transformer and a secondary-winding of an itransformer. The passive-transformers are applied in the LED driving circuit to implement current balance/equalization, such that the LED backlight driving circuit is suitable for a system with any odd or even number (greater than 1) of the LED strings connected in parallel, so as to reduce the cost of the system.

Light emitting diode backlight driving circuit

An LED power supply device is provided. In the invention, a digital control device and a programmable interface are used to set an output specification of the LED power supply device, such that one smart LED power supply device can be used to supply power to the LED lamps of different specifications. In this way, it is unnecessary to specifically design and test the power supply devices for the LED lamps of different specifications, so that a design and production cycle of the LED power supply devices and costs thereof are greatly reduced. On the other hand, usage of the digital control device avails monitoring and controlling a state of the LED lamp, for example, implementing temperature control, time control, color and luminance control, etc., by which a service life, efficiency and flexibility of the LED lamp are enhanced.

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Province, China

Shaobin Zhang