LED string

• US 7,986,100 B2
• Filed: 09/08/2008
• Issued: 07/26/2011
• Est. Priority Date: 11/23/2007
• Status: Expired due to Fees

• Current Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Inventors: Li, Zhi-Guo, Ke, Jui-Lin, Yin, Hui, Hsieh, Kuan-Hong, Chung, Shin-Hong, Wang, Han-Che
• Primary Examiner(s): Owens; Douglas W
• Assistant Examiner(s): PHAM, THAI N
• Application Number:
  US12/205,924
• Publication Number:
  US 20090134810A1
• Time in Patent Office: 1,051 Days
• Field of Search: 315/185, 315/185.S, 315/187, 315/200.A, 315312-326, 362/85, 362/86, 362/95, 362/249.06, 362/249.14, 362/231, 362/545
• US Class Current: 315/187
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/395 Linear regulators
• CPC Class Codes: H05B 45/40 Details of LED load circuits
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A light-emitting diode (LED) string is provided. The LED string includes a power plug configured for connecting with a power source to power the LED string; one or more LED sockets configured for electrically connecting with the power plug; one or more LEDs configured for being installed on and electrically connecting with the LED sockets; and a control module configured for being electrically connected with anyone of the LED sockets. The control module includes a control circuit, an input terminal and an output terminal, the control circuit electrically connects with one of the LED sockets via the input terminal and the output terminal and controls a current flowing through the LED string to change from a first value to a second value, thereby controlling the LED string to light.

Claims

1. An LED string comprising:

a power plug configured for connecting with a power source to power the LED string;

one or more LED sockets configured for electrically connecting with the power plug;

one or more LEDs configured for being installed on and electrically connecting with the one or more LED sockets; and

a control module configured for being electrically connected with one of the one or more LED sockets;

wherein the control module includes a control circuit, an input terminal, an output terminal, the control circuit electrically connects with one of the one or more LED sockets via the input terminal and the output terminal and controls a current flowing through the LED string to change from a first value to a second value, thereby controlling the LED string to light;

wherein the control circuit comprises an oscillating circuit, a resistance component and capacitance component network (RC) circuit, and a field effect transistor, the oscillating circuit outputs a square wave signal, the RC circuit converts the square signal to a triangle wave signal which is used to control the field effect transistor to turn on and off, the field effect transistor comprises a drain electrode and a source electrode and a gate electrode, the drain electrode and the source electrode are correspondingly connected with the input terminal and the output terminal of the control module, and the gate electrode is connected with the RC circuit.

2. The LED string as claimed in claim 1, wherein the oscillating circuit comprises a diode, a first resistance component, a second resistance component, a first capacitance, a second capacitance, and a not gate, the not gate comprises a power supply terminal, a ground, an input terminal, and an output terminal;

the diode, the first resistance component and the first capacitance component are connected in series between the input terminal and the output terminal of the control module, the power supply terminal is connected with the node provided between the first resistance component and the first capacitance component, the ground of the not gate is connected with the output terminal of the control module, the input terminal is connected with output terminal of the control module through the second capacitance component, the output terminal of the not gate is feedback to the input terminal of the not gate through the second resistance.

3. The LED string as claimed in claim 2, wherein the second resistance component has a variable resistance.

4. The LED string as claimed in claim 2, wherein the second capacitance component has a variable capacitance.

5. An LED string comprising:

a power plug configured for connecting with a power source to power the LED string;

one or more LED sockets configured for electrically connecting with the power plug;

one or more LEDs configured for being installed on and electrically connecting with the one or more LED sockets; and

a control module configured for being electrically connected with one of the one or more LED sockets;

wherein when the control module and one of the one or more LEDs are both installed into one of the one or more LED sockets, the control module is connected in parallel to the one LED and only controls the blinking frequency and brightness of the one LED, and when the one LED is removed from the one LED socket and the control module is left remaining in the one LED socket, the control module is electrically connected in series with all the other LEDs and controls the blinking frequency and brightness of the other LEDs; and

the control module configured for being electrically connected with one of the one or more LED sockets;

wherein the control module includes a control circuit comprises an oscillating circuit, a resistance component and capacitance component network (RC) circuit, and a field effect transistor, the oscillating circuit outputs a square wave signal, the RC circuit converts the square signal to a triangle wave signal which is used to control the field effect transistor to turn on and off, the field effect transistor comprises a drain electrode and a source electrode and a gate electrode, the drain electrode and the source electrode are correspondingly connected with the input terminal and the output terminal of the control module, and the gate electrode is connected with the RC circuit.

6. The LED string as claimed in claim 5, wherein each of the one or more LED sockets comprise a positive electrode and a negative electrode, each of the one or more LEDs comprising a positive electrode and a negative electrode configured for connecting with the positive electrode and the negative electrode of each LED socket correspondingly.

7. The LED string as claimed in claim 6, wherein the positive electrode and the negative of each LED socket are further configured for connecting with an input terminal and an output terminal of the control module correspondingly.

8. The LED string as claimed in claim 5, wherein the control module comprises an oscillating circuit, a resistance component and capacitance component network (RC) circuit, and a field effect transistor, the oscillating circuit outputs a square wave signal, the RC circuit converts the square signal to a triangle wave signal which is used to control the field effect transistor to turn on and off, the field effect transistor comprises a drain electrode and a source electrode and a gate electrode, the drain electrode and the source electrode are correspondingly connected with an input terminal and an output terminal of the control module, and the gate electrode is connected with the RC circuit.

9. The LED string as claimed in claim 8, wherein the oscillating circuit comprises a diode, a first resistance component, a second resistance component, a first capacitance, a second capacitance, and a not gate, the not gate comprises a power supply terminal, a ground, an input terminal, and an output terminal;

the diode, the first resistance component and the first capacitance component are connected in series between the input terminal and the output terminal of the control module, the power supply terminal is connected with the node provided between the first resistance component and the first capacitance component, the ground of the not gate is connected with the output terminal of the control module, the input terminal is connected with output terminal of the control module through the second capacitance component, the output terminal of the not gate is feedback to the input terminal of the not gate through the second resistance.

10. The LED string as claimed in claim 9, wherein the second resistance component has a variable resistance.

11. The LED string as claimed in claim 9, wherein the second capacitance component has a variable capacitance.