LED LAMP CIRCUIT

• US 20200137854A1
• Filed: 05/21/2018
• Published: 04/30/2020
• Est. Priority Date: 05/25/2017
• Status: Active Grant

• Current Assignee: Current Lighting Solutions, LLC (f/k/a GE Lighting Solutions, LLC) (American Industrial Partners)
• Original Assignee: Current Lighting Solutions, LLC (f/k/a GE Lighting Solutions, LLC) (American Industrial Partners)
• Inventors: Mao, Zhu, Long, Qi, Fang, Min, Qin, Shuyi, Zhang, Bo, Wang, Fanbin
• Granted Patent: US 11,317,496 B2
• Time in Patent Office: Days
• CPC Class Codes: H01C 7/02 having positive temperature coefficient ceramics C04B
• CPC Class Codes: H01C 7/04 having negative temperature coefficient thermometers using resistive elements G01K7/16
• CPC Class Codes: H05B 45/18 using temperature feedback
• CPC Class Codes: H05B 45/56 involving measures to prevent abnormal temperature of the LEDs
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

Provided is an LED lamp circuit, comprising an LED luminous component circuit, a rectifier circuit, and an output control circuit coupled between the LED luminous component circuit and the rectifier circuit. The LED luminous component circuit comprises at least one light-emitting diode. The rectifier circuit is configured to output a rectified voltage to the LED luminous component circuit. The output control circuit comprises a voltage regulator circuit and a control switch circuit. The voltage regulator circuit comprises a thermosensitive device and a voltage divider connected in series. The thermosensitive device can regulate the control voltage at both ends of the control switch circuit. To protect the LED lamp, the control switch circuit disconnects when the control voltage is less than the threshold voltage of the control switch circuit.

Claims

1. A LED lamp circuit comprising:

an LED luminous component circuit comprising at least one LED;

a rectifying circuit configured to produce a rectified voltage output to the LED luminous component circuit;

an output control circuit coupled between the LED luminous component circuit and the rectifying circuit, the output control circuit comprising a voltage regulation circuit and a control switch, the voltage regulation circuit comprising a thermosensitive component and a voltage dividing component connected in series, the thermosensitive component configured to regulate a control voltage of the control switch, and the control switch disconnects when the control voltage is lower than a threshold voltage of the control switch.

2. The LED lamp circuit of claim 1, wherein the voltage regulation circuit and the rectifying circuit are connected in parallel, and the control switch is coupled between the voltage regulation circuit and the LED luminous component circuit.

3. The LED lamp circuit of claim 1, wherein the thermosensitive component comprises a thermistor.

4. The LED lamp circuit of claim 1, wherein the voltage dividing component comprises a voltage dividing resistor.

5. The LED lamp circuit of claim 1, wherein the voltage dividing component comprises a voltage regulation tube.

6. The LED lamp circuit of claim 1, wherein the control switch comprises a field-effect transistor, the field-effect transistor comprises a gate, a source and a drain, and the gate of the field-effect transistor is coupled between the thermosensitive component and the voltage dividing component.

7. The LED lamp circuit of claim 6, wherein the thermosensitive component comprises at least one negative temperature coefficient thermistor, the source of the field-effect transistor is coupled to one end of the at least one negative temperature coefficient thermistor, the gate of the field-effect transistor is coupled between the at least one negative temperature coefficient thermistor and the voltage dividing component, the drain of the field-effect transistor is coupled to the LED luminous component circuit.

8. The LED lamp circuit of claim 7, wherein the at least one negative temperature coefficient thermistor comprises four negative temperature coefficient thermistors connected in parallel.

9. The LED lamp circuit of claim 6, wherein the thermosensitive component comprises at least one positive temperature coefficient thermistor, the source of the field-effect transistor is coupled to one end of the voltage dividing component, the gate of the field-effect transistor is coupled between the voltage dividing component and the at least one positive temperature coefficient thermistor, the drain of the field-effect transistor is coupled to the LED luminous component circuit.

10. The LED lamp circuit of claim 9, wherein the at least one positive temperature coefficient thermistor comprises four positive temperature coefficient thermistors connected in series.