Driving device and driving voltage regulation method

Abstract

The invention relates to a driving device. The driving device is used for driving a plurality of loads to work and comprises a voltage regulation unit and a plurality of sensing units, wherein the voltage regulation unit is used for receiving direct current (DC) voltage to be electrified to work so as to output a driving voltage to the plurality of loads; the plurality of sensing units are used for sensing the total forward voltage of the plurality of corresponding loads respectively to generate a plurality of corresponding sensing voltages and comparing the plurality of sensing voltages with a preset first reference voltage respectively, and the corresponding sensing unit generates a first feedback signal when one sensing voltage is lower than the first reference voltage; and the voltage regulation unit increases the driving voltage based on the first feedback signal.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a driving device and a driving voltage regulation method. Background technique [0002] Light Emitting Diode (LED, Light Emitting Diode) is widely used in the lighting field due to its low power supply voltage, low power consumption, safe and reliable use, and environmental protection. For example, light-emitting diodes are applied to backlight modules of liquid crystal displays. LEDs are generally driven by a constant current source that outputs a constant current to them, so that the luminance of the LEDs remains consistent. [0003] However, due to uneven manufacturing and temperature changes during use, and the conductive material on the circuit board is also different due to uneven manufacturing, the equivalent resistance is different, often resulting in different LED strings when driving LEDs. The difference in the total forward voltage (VF, Forward Voltage) drop betw...

AI Technical Summary

Problems solved by technology

[0003] However, due to uneven manufacturing and temperature changes during use, and the conductive material on the circuit board is also different due to uneven manufacturing, the equivalent resistance is different, often resulting in different LED strings when driving LEDs. The difference in the total forward voltage (VF, Forward Voltage) drop between the LED strings causes problems in the driving between the LED strings

If the LED driving voltage is too low, some LED strings will not be able to light up, but if it is too high, there will be too much voltage loss on the driving MOS tube of the constant current source.

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