US Patent No. 10,143,072

MULTI-CHANNEL DUAL-MODE DIGITAL CONTROL LED DRIVING CIRCUIT AND LED LAMP


Patent No. 10,143,072
Issue Date November 27, 2018
Title Multi-channel Dual-mode Digital Control Led Driving Circuit And Led Lamp
Inventorship Tianqi Sun, Shenzhen (CN)
Assignee SHENZHEN SKYWORTH-RGB ELECTRONIC CO., LTD, Shenzhen (CN) SHENZHEN SKYWORTH...

Claim of US Patent No. 10,143,072

1. A multi-channel dual-mode digital control light emitting diode (LED) driving circuit comprising: a current sampling module, a comparison and detection module, a digital control module and a constant current control module;the current sampling module converts a current signal of a load into a sampling voltage signal, before outputting to the comparison and detection module and the constant current control module; the comparison and detection module compares the sampling voltage to a fixed voltage, before generating a high/low voltage signal according to a comparison result, and outputting to the digital control module, while at a same time, a dynamically changing voltage signal is generated and output to the constant current control module; the digital control module outputs a corresponding step-up or step-down output signal to an external voltage boost control module and a drive module sequentially, according to the high/low voltage signal output from the comparison and detection module, thus a feedback adjustment to the load is achieved; the constant current control module compares to a fixed frequency sawtooth signal according to the sampling voltage, and generates a switching signal with a changing duty cycle in a real time, before controlling a switch state of an inner constant current drive tube according to the duty cycle change of the switching signal, followed by feeding back an adjustment current for the load in a real time.