US 2026/0271154 A1 · High-Efficiency LED Lighting Control System and Constant Current Control Circuit Therefor

Abstract

This application discloses a high-efficiency LED lighting control system and a constant current control scheme therefor. The anode of an LED load is connected to an output terminal of a rectifier circuit. A first switch and two parallel capacitor paths are connected between a cathode of the LED load and ground. Each of the two parallel capacitor paths includes a first diode, an electrolytic capacitor, and a second switch connected in series. The two parallel capacitor paths are connected through a third switch such that when the third switch is turned on, the electrolytic capacitors in the two parallel capacitor paths form a series discharge path. A rectified half-wave voltage at a power frequency is used as an input voltage. Within different voltage ranges of the input voltage, different current paths are controlled to conduct, thereby increasing system input current width of the and improving system efficiency.

Claims20

Dependent claims

An LED lighting control system for controlling an LED load, comprising:

a rectifier circuit, configured to rectify an alternating current to obtain an input voltage, the input voltage being a half-wave voltage at a power frequency, and an anode of the LED load being connected to an output terminal of the rectifier circuit;
a first switch, connected between a cathode of the LED load and ground;
two parallel capacitor paths, connected between the cathode of the LED load and the ground, each capacitor path of the two parallel capacitor paths including a first unidirectional conducting element, a first electrolytic capacitor, and a second switch, and the first unidirectional conducting element being connected to the cathode of the LED load;
and
a third switch, connecting the two parallel capacitor paths such that when the third switch is turned on, two first electrolytic capacitors in the two parallel capacitor paths form a series discharge path.

2 more elements

A constant current control circuit for an LED lighting control system, the LED lighting control system comprising a rectifier circuit and a plurality of LED current paths, wherein an anode of an LED load is configured to receive an input voltage of a half-wave at a power frequency that is output from the rectifier circuit, and the plurality of LED current paths are connected between a cathode of the LED load and ground;

wherein the plurality of LED current paths include a first switching current path and at least two parallel capacitor current paths;
and
wherein the constant current control circuit is connected to a current sampling terminal of the plurality of LED current paths and a current control terminal of the plurality of LED current paths;
and
the constant current control circuit comprises:
a signal control circuit, configured to receive feedback current sampling information from the plurality of LED current paths, and amplify an error between the feedback current sampling information and a reference value to generate a plurality of reference signals;
and
a plurality of operational amplifiers, configured to amplify errors between the feedback current sampling information of the plurality of LED current paths and the plurality reference signals, to control one or more operating currents of the plurality of LED current paths based on error amplification results, thereby realizing constant current control of the LED load.

5 more elements

Dependencies are inferred from the claim text.

High-Efficiency LED Lighting Control System and Constant Current Control Circuit Therefor

Life of this patent

High-Efficiency LED Lighting Control System and Constant Current Control Circuit Therefor

Life of this patent

Abstract

Claims20