Control System for Feedback Controlled LED Driving Circuit

Abstract

A control system for a feedback controlled LED driving circuit, which includes a valley detect regulator unit and a control and feedback unit. The valley detect regulator unit detects a sine-like DC voltage input by a rectification unit, and stores the electric energy in the storage capacitor when the input voltage is lower than a preset valley voltage. The stored electric energy converted into the system required voltage by a system power supply unit. The control and feedback unit electrically connect to the feedback controlled LED driving circuit, providing PFC, step dimming or color temperature adjustment for driving the LED light-emitting element and detecting a feedback signal of the LED driver circuit for controlling an output current of the LED driver circuit or providing protective measures.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of Taiwan Patent Application No. 103105561, filed on Feb. 19, 2014, in the Taiwan Intellectual Property Office, the disclosure of which is incorporated herein its entirety by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to the field of a control system for the light emitting diode (LED) driving circuit, in particular with respect to a control system for the feedback controlled LED driving circuit.[0004]2. Description of the Related Art[0005]Recently, as the unceasing improvement in DC conversion driver technique used in light emitting diode (LED), such as various designs of linear electric power driver and switching power driver, and switching power driver comprises isolated, non-isolated and various derivatives of topology configurations of which aims at providing acceptable technical solutions to consumers in the fields of power factor, efficie...

AI Technical Summary

Benefits of technology

This patent is about a control system for driving LED lights that reduces energy consumption by using a lower voltage threshold. The system also uses a PFC unit to improve conversion efficiency by adjusting the LED driver circuit. Overall, this technology aims to save energy and improve the performance of LED lighting systems.

Problems solved by technology

In terms of conventional LED driver circuit, the main problem of power supply controller lies in that it is self-powered which leads to that a transformer has to coil additional wires, slower start speed and false start resulted from current leakage of power switch may be also included.

And the means of non-self-powered uses line voltage to directly reduce voltage for supplying power which wastes more electric power as well as degrades the entire conversion efficiency.

In addition, regarding the conventional power factor correction (PFC), it mostly uses the waveform of AC voltage derived from analog conversion to correct the reference voltage, but the means is incapable of optimizing the power factor and current harmonics based on the adjusted current waveform adapted by various driving methods, and it also has to add extra pin to detect waveform and therefore raises the cost of controller.

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