Systems and methods for providing power supply to current controllers associated with LED lighting

Patent metadata

Field	Value
Publication number	US-12464620-B2
Application number	US-202318500903-A
Country	US
Kind code	B2
Filing date	Nov 2, 2023
Priority date	Dec 19, 2019
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

System and method for controlling one or more light emitting diodes. For example, the system includes: a power supply controller configured to receive a cathode voltage from a cathode of a diode, the diode including an anode configured to receive a rectified voltage generated by a rectifying bridge, the power supply controller being further configured to generate a first signal based at least in part on the cathode voltage; and a driver configured to receive the first signal and generate a second signal based at least in part on the first signal, the driver being further configured to output the second signal to a gate terminal of a transistor, the transistor including a source terminal coupled to the driver and a first resistor, the transistor further including a drain terminal coupled to the one or more light emitting diodes and an output capacitor connected to the cathode of the diode.

First claim

What is claimed is:

1 . A system comprising:
a power supply controller configured to receive a voltage to generate a first signal based at least in part on the voltage; wherein the power supply controller is further configured to:
if the voltage has not remained higher than a predetermined voltage threshold for a time duration that is equal to or longer than a predetermined time threshold, generate the first signal at a first level to keep a transistor turned on, the predetermined time threshold being larger than zero in magnitude; and
if the voltage has remained higher than the predetermined voltage threshold for the time duration that is equal to or longer than the predetermined time threshold, generate the first signal at a second level to allow the transistor to be turned on and to be turned off, the second level being different from the first level.

2 . The system of claim 1 wherein the predetermined time threshold is longer than at least one cycle of the voltage in duration.

3 . The system of claim 1 wherein the power supply controller is further configured to, if the voltage has not remained higher than the predetermined voltage threshold for the time duration that is equal to or longer than the predetermined time threshold, keep the transistor turned on to charge an output capacitor.

4 . The system of claim 1 wherein the power supply controller includes:
a voltage generator configured to receive the voltage;
an operation controller coupled to the voltage generator and configured to generate the first signal;
a voltage detector configured to receive the voltage, determine whether the voltage is higher than the predetermined voltage threshold, and generate a second signal indicating whether the voltage is higher than the predetermined voltage threshold; and
a timer configured to receive the second signal and generate a timer signal, the timer signal indicating whether the voltage has remained higher than the predetermined voltage threshold for the time duration that is equal to or longer than the predetermined time threshold.

5 . The system of claim 4 wherein the operation controller is further configured to receive the timer signal and generate the first signal based at least in part on the timer signal.

6 . The system of claim 5 wherein the operation controller is further configured to:
if the timer signal indicates that the voltage has not remained higher than the predetermined voltage threshold for the time duration that is equal to or longer than the predetermined time threshold, generate the first signal at the first level to keep the transistor turned on; and
if the timer signal indicates that the voltage has remained higher than the predetermined voltage threshold for the time duration that is equal to or longer than the predetermined time threshold, generate the first signal at the second level to allow the transistor to be turned on and to be turned off.

7 . The system of claim 6 further comprising a driver, wherein the driver is further configured to:
if the first signal is at the first level, generate a third signal at a third level to turn on the transistor; and
if the first signal is at the second level, change the third signal from the third level to a fourth level to turn off the transistor or from the fourth level to the third level to turn on the transistor.

8 . The system of claim 7 wherein:
the transistor is an NMOS transistor;
the third level corresponds to a high voltage level; and
the fourth level corresponds to a low voltage level, the low voltage level being lower than the high voltage level.

9 . The system of claim 7 wherein the driver is further configured to:
receive a feedback signal from a resistor; and
if the first signal is at the second level, change, based at least in part on the feedback signal, the first signal from the third level to the fourth level to turn off the transistor or from the fourth level to the third level to turn on the transistor.

10 . The system of claim 9 wherein the driver is further configured to:
if the first signal is at the second level, change the third signal, based at least in part on the feedback signal, from the third level to the fourth level to turn off the transistor or from the fourth level to the third level to turn on the transistor, to regulate at a predetermined current magnitude a current that flows through one or more light emitting diodes.

11 . The system of claim 4 wherein the voltage generator includes at least one selected from a group consisting of a junction field-effect transistor and a low dropout regulator.

12 . The system of claim 1 wherein:
the first level corresponds to a logic high level; and
the second level corresponds to a logic low level.

13 . A method comprising:
receiving a voltage; generating a first signal based at least in part on the voltage; and receiving the first signal; wherein the generating a first signal based at least in part on the voltage includes:
if the voltage has not remained higher than a predetermined voltage threshold for a time duration that is equal to or longer than a predetermined time threshold, generating the first signal at a first level to keep a transistor turned on, the predetermined time threshold being larger than zero in magnitude; and
if the voltage has remained higher than the predetermined voltage threshold for the time duration that is equal to or longer than the predetermined time threshold, generating the first signal at a second level to allow the transistor to be turned on and to be turned off, the second level being different from the first level.

14 . The method of claim 13 wherein the predetermined time threshold is longer than at least one cycle of the voltage in duration.

15 . The method of claim 13 further comprising:
generating a second signal based at least in part on the first signal; and
outputting the second signal to a gate terminal of the transistor;
wherein the outputting the second signal to a gate terminal of the transistor includes:
if the voltage has not remained higher than the predetermined voltage threshold for the time duration that is equal to or longer than the predetermined time threshold, keep the transistor turned on to charge an output capacitor.

16 . The method of claim 13 wherein the generating a first signal based at least in part on the voltage further includes:
determining whether the voltage is higher than the predetermined voltage threshold;
generating a second signal indicating whether the voltage is higher than the predetermined voltage threshold;
receiving the second signal; and
generating a timer signal indicating whether the voltage has remained higher than the predetermined voltage threshold for the time duration that is equal to or longer than the predetermined time threshold.

17 . The method of claim 16 wherein the generating a first signal based at least in part on the voltage further includes:
receiving the timer signal; and
generating the first signal based at least in part on the timer signal.

18 . The method of claim 17 wherein the generating the first signal based at least in part on the timer signal includes:
if the timer signal indicates that the voltage has not remained higher than the predetermined voltage threshold for the time duration that is equal to or longer than the predetermined time threshold, generating the first signal at the first level to keep the transistor turned on; and
if the timer signal indicates that the voltage has remained higher than

Assignees

• On Bright Electronics Shanghai Co Ltd

Inventors

• Li Zhuoyan
• Li Ke
• Zhu Liqiang

Classifications

• H05B45/14

  using electrical feedback from LEDs or from LED modules · CPC title

• Y02B20/30

  Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED] · CPC title

• H05B45/31

  Phase-control circuits · CPC title

• H05B45/395

  Linear regulators · CPC title

• H05B45/44 Primary

  with an active control inside an LED matrix · CPC title