Granted Patent B2

US 12,438,534 · App. 18/238,990 · Granted Oct 7, 2025

Inventors: Liqiang Zhu (Shanghai, CN); Jun Zhou (Shanghai, CN)

Assignee: On-Bright Electronics (Shanghai) Co., Ltd.

H03K5/24H05B45/10H05B45/3575H05B45/395G01R19/16538Y02B20/30

Abstract

Claims (63)

1. A system for controlling one or more light emitting diodes, the system comprising:

a bleeder configured to receive a rectified voltage generated by a rectifying bridge; and

a controller configured to:

receive a sensing voltage indicating a magnitude of a first current flowing through the one or more light emitting diodes;

receive an input voltage generated by a voltage divider, the voltage divider being configured to receive a dimmer output voltage generated by a TRIAC dimmer, the input voltage indicating a magnitude of the dimmer output voltage; and

output a control signal to the bleeder;

wherein the controller is further configured to:

generate the control signal to turn off the bleeder if the sensing voltage and the input voltage satisfy a first condition so that the bleeder does not generate a second current, the second current being larger than zero in magnitude; and

generate the control signal to turn on the bleeder if the sensing voltage and the input voltage satisfy a second condition so that the bleeder generates the second current;

wherein the second condition is different from the first condition;

wherein the controller is further configured to:

generate the control signal at a first logic level from a first time to a second time, during which the sensing voltage is smaller than a first reference voltage in magnitude and the input voltage is smaller than a second reference voltage in magnitude;

generate the control signal at a second logic level from the second time to a third time, during which the sensing voltage is larger than the first reference voltage in magnitude and the input voltage is larger than the second reference voltage in magnitude;

generate the control signal at the second logic level from the third time to a fourth time, during which the sensing voltage is smaller than the first reference voltage in magnitude and the input voltage is larger than the second reference voltage in magnitude; and

generate the control signal at the first logic level from the fourth time to a fifth time, during which the sensing voltage is smaller than the first reference voltage in magnitude and the input voltage is smaller than the second reference voltage in magnitude;

wherein the first logic level and the second logic level are different.

2. The system of claim 1 wherein:

the control signal at the first logic level is configured to turn on the bleeder so that the bleeder generates the second current; and

the control signal at the second logic level is configured to turn off the bleeder so that the bleeder does not generate the second current.

3. The system of claim 1 wherein the rectifying bridge is coupled to the TRIAC dimmer through a fuse.

4. A system for controlling one or more light emitting diodes, the system comprising:

a bleeder configured to receive a rectified voltage generated by a rectifying bridge; and

a controller configured to:

receive a sensing voltage indicating a magnitude of a first current flowing through one or more light emitting diodes;

receive an input voltage generated by a voltage divider, the voltage divider being configured to receive a dimmer output voltage generated by a TRIAC dimmer, the input voltage indicating a magnitude of the dimmer output voltage; and

output a control signal to the bleeder;

wherein the controller is further configured to:

generate the control signal to turn off the bleeder if the input voltage satisfies a first condition so that the bleeder does not generate a second current, the second current being larger than zero in magnitude; and

generate the control signal to turn on the bleeder if the input voltage satisfies a second condition so that the bleeder generates the second current;

wherein the second condition is different from the first condition.

5. The system of claim 4 wherein the controller is further configured to:

generate the control signal at a first logic level from a first time to a second time, during which the input voltage is smaller than a reference voltage in magnitude;

generate the control signal at a second logic level from the second time to a third time, during which the input voltage is larger than the reference voltage in magnitude; and

generate the control signal at the first logic level from the third time to a fourth time, during which the input voltage is smaller than the reference voltage in magnitude;

wherein the first logic level and the second logic level are different.

6. The system of claim 5 wherein:

the control signal at the first logic level is configured to turn on the bleeder so that the bleeder generates the second current; and

the control signal at the second logic level is configured to turn off the bleeder so that the bleeder does not generate the second current.

7. The system of claim 4 wherein the rectifying bridge is coupled to the TRIAC dimmer through a fuse.

8. A method for controlling one or more light emitting diodes, the method comprising:

receiving by a bleeder, a rectified voltage generated by a rectifying bridge;

receiving a sensing voltage, the sensing voltage indicating a magnitude of a first current flowing through one or more light emitting diodes;

receiving an input voltage generated by a voltage divider, the voltage divider being configured to receive a dimmer output voltage generated by a TRIAC dimmer, the input voltage indicating a magnitude of the dimmer output voltage; and

outputting a control signal to the bleeder;

wherein the outputting a control signal to the bleeder includes:

generating the control signal to turn off the bleeder if the sensing voltage and the input voltage satisfy a first condition so that the bleeder does not generate a second current, the second current being larger than zero in magnitude; and

generating the control signal to turn on the bleeder if the sensing voltage and the input voltage satisfy a second condition so that the bleeder generates the second current;

wherein the second condition is different from the first condition;

wherein the outputting a control signal to the bleeder further includes:

generating the control signal at a first logic level from a first time to a second time, during which the sensing voltage is smaller than a first reference voltage in magnitude and the input voltage is smaller than a second reference voltage in magnitude;

generating the control signal at a second logic level from the second time to a third time, during which the sensing voltage is larger than the first reference voltage in magnitude and the input voltage is larger than the second reference voltage in magnitude;

generating the control signal at the second logic level from the third time to a fourth time, during which the sensing voltage is smaller than the first reference voltage in magnitude and the input voltage is larger than the second reference voltage in magnitude; and

generating the control signal at the first logic level from the fourth time to a fifth time, during which the sensing voltage is smaller than the first reference voltage in magnitude and the input voltage is smaller than the second reference voltage in magnitude;

wherein the first logic level and the second logic level are different.

9. A method for controlling one or more light emitting diodes, the method comprising:

receiving, by a bleeder, a rectified voltage generated by a rectifying bridge;

receiving a sensing voltage, the sensing voltage indicating a magnitude of a first current flowing through one or more light emitting diodes;

receiving an input voltage generated by a voltage divider, the voltage divider being configured to receive a dimmer output voltage generated by a TRIAC dimmer, the input voltage indicating a magnitude of the dimmer output voltage; and

outputting a control signal to the bleeder;

wherein the outputting a control signal to the bleeder includes:

generating the control signal to turn off the bleeder if the input voltage satisfies a first condition so that the bleeder does not generate a second current, the second current being larger than zero in magnitude; and

generating the control signal to turn on the bleeder if the input voltage satisfies a second condition so that the bleeder generates the second current;

wherein the second condition is different from the first condition.

Assignments (1)

Priority Claims (1)

Continuity (4)

References Cited (400)

Cited By (1)

US 12,720,651