LED illumination driving current linear adjustment and dimming control circuit

Abstract

The invention provides an LED illumination driving current linear adjustment and dimming control circuit. The LED illumination driving current linear adjustment and dimming control circuit comprises an AC power supply module, an LED module, a driving IC, a dimming control module and a linear current adjustment module. When an input voltage is increased, the linear current adjustment module can control a current flowing through the LED module to be reduced, so that the balance of the input power is achieved, and the linear adjustment rate of the LED module is further improved. The dimming control module can change the change of the internal reference voltage of the driving IC through the change of an external input voltage, thereby realizing the change of the current of the LED module, maintaining the current driving part in a matched manner, and switching on / off a maintaining current path. Therefore, the circuit can be suitable for the silicon controlled dimming application, and meanwhile, the structure can be compatible with 0-10V and a pulse width modulation (PWM) driving mode, so that the applicability can be improved.

Description

technical field [0001] The invention relates to a linear adjustment and dimming control circuit of LED lighting driving current. Background technique [0002] Generally, when driving linear LED lighting, the industry basically only pays attention to the control of the lamp bead current. When they are combined with a thyristor dimmer, an additional dimming control IC is needed, which not only becomes complicated in structure, but also increases the cost. In addition, when the external power supply voltage fluctuates and rises, its LED lamp beads and driver IC will withstand high-voltage shocks, which will cause device damage and reduce circuit reliability. Contents of the invention [0003] The present invention aims at solving one of the above technical problems at least to a certain extent or at least providing a useful commercial choice. For this reason, the object of the present invention is to propose a LED lighting drive current linear adjustment and dimming control...

AI Technical Summary

Problems solved by technology

[0002] Generally, when driving linear LED lighting, the industry basically only pays attention to the control of the lamp bead current. When they are combined with a thyristor dimmer, an additional dimming control IC is needed, which not only becomes complicated in structure, but also increases the cost

In addition, when the external power supply voltage fluctuates and rises, its LED lamp beads and driver IC will withstand high voltage impact, which will cause device damage and reduce circuit reliability

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