US Patent No. 10,973,101

DRIVER FOR LED DEVICE AND LED SYSTEM


Patent No. 10,973,101
Issue Date April 06, 2021
Title Driver For Led Device And Led System
Inventorship Zhu Mao, ShangHai (CN)
Min Fang, ShangHai (CN)
Zhangji Zhou, ShangHai (CN)
Shuyi Qin, ShangHai (CN)
Fanbin Wang, ShangHai (CN)
Assignee CURRENT LIGHTING SOLUTIONS, LLC, East Cleveland, OH (US)

Claim of US Patent No. 10,973,101

1. A single-stage driver for an LED device, configured to be coupled between a power supply and the LED device, the driver comprising:a rectifier, configured to be coupled to the power supply and convert an alternating voltage from the power supply into a first direct voltage;
a DC-to-DC converter, coupled between the rectifier and the LED device and configured to receive the first direct voltage and provide a constant current to the LED device, the DC-to-DC converter comprising at least two switches, wherein the at least two switches comprises a first switch, a second switch and a third switch, wherein the DC-to-DC converter further comprises an inductor, a first diode, a second diode, a third diode and a first capacitor; the power supply is configured to charge the inductor via the first, second and third switches when the first, second and third switches are on; the inductor is configured to discharge via the first diode, the first capacitor, the third diode and the second diode when the first, second and third switches are off;
a resistor, configured to be coupled in series with the LED device; and
a controller, coupled between the resistor and the at least two switches and configured to keep the current through the LED device stable around a predetermined current value by controlling the at least two switches based on a voltage across the resistor, wherein the at least two switches are turned on or off synchronously.