CONSTANT-CURRENT-DRIVE LED MODULE DEVICE

• US 20120206056A1
• Filed: 11/06/2009
• Published: 08/16/2012
• Est. Priority Date: 10/26/2009
• Status: Active Grant

• Current Assignee: Airtec System Co., Ltd.
• Original Assignee: Airtec System Co., Ltd.
• Inventors: Jung, Hye Man, Ha, Seok Jin, Park, In Ki, Koo, Sang Shin, Kim, Jong Hyun
• Granted Patent: US 8,872,434 B2
• Time in Patent Office: Days
• US Class Current: 315/200.R
• CPC Class Codes: H05B 45/37 Converter circuits
• CPC Class Codes: H05B 45/395 Linear regulators
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A constant-current-drive LED module device includes a rectifier configured to receive and rectify an alternating current power source; a unidirectional LED module unit configured to connect to one end of the rectifier; and a constant current unit configured to connect between the unidirectional LED module unit and the other end of the rectifier to control constant current.

Claims

1. A constant-current-drive LED module device, comprising:

a rectifier configured to receive and rectify an alternating current power source;

a unidirectional LED module unit configured to connect to one end of the rectifier; and

a constant current unit configured to connect between the unidirectional LED module unit and the other end of the rectifier to control constant current.

2. The constant-current-drive LED module device of claim 1, wherein the constant current includes:

a switching unit configured to connect between the LED module unit and the other end of the rectifier and to be switched using pulsating current output from the rectifier;

a control voltage output unit configured to detect load current flowing in the unidirectional LED module unit and convert switching voltage output from the switching unit into driving voltage of first or second level according to a magnitude in the detected load current; and

a constant current driver configured to be controlled by the driving voltage of the first or second level to provide constant current.

3. The constant-current-drive LED module device of claim 1, wherein the constant-current-drive unit includes:

a control voltage output unit configured to detect the load current flowing in the unidirectional LED module unit and convert the voltage between the LED module unit and the other end of the rectifier into the driving voltage of the first and second levels according to the magnitude in the detected load current; and

a constant current driver configured to be controlled by the driving voltage of the first and second levels to provide the constant current.

4. The constant-current-drive LED module device of claim 2, further comprising:

a charging and discharging unit including a resistor-capacitor connected to an upper diode and/or a lower diode of the rectifier in parallel.

5. The constant-current-drive LED module device of claim 4, wherein the constant current driver is any one of a field effect transistor (FET), a bipolar junction transistor (BJT), and an insulated gate bipolar transistor (IGBT).

11. The constant-current-drive LED module device of claim 4, wherein the control voltage output unit includes:

a detection resistor configured to detect load current flowing in the unidirectional LED module unit; and

a three terminal zener diode configured to output zener voltage that is the driving voltage of the first level when control voltage applied to the detection resistor is a predetermined value or less and output the driving voltage of the second level maintaining a short state between an anode and a cathode when the control voltage exceeds the predetermined value.

13. The constant-current-drive LED module device of claim 4, wherein when the input voltage of the AC power source is fluctuated within a range of 10% of rated voltage, the load current flowing in the unidirectional LED module unit is fluctuated within a range of 5 to 20%.

15. The constant-current-drive LED module device of claim 4, wherein when the input voltage of the AC power source is fluctuated within a range of 10%, luminous quantity of the unidirectional LED module unit is fluctuated within a range of 5 to 20%.

17. The constant-current-drive LED module device of claim 3, further comprising:

a charging and discharging unit including a resistor-capacitor connected to an upper diode and/or a lower diode of the rectifier in parallel.

6. A constant-current-drive LED module device, comprising:

a rectifier configured to receive and rectify an alternating current power source;

a constant current unit configured to connect to a lead leg and a lag leg of the rectifying unit to provide constant current; and

a bidirectional LED module unit connected between the other end of the rectifier and the other end of the alternating current power source.

7. The constant-current-drive LED module device of claim 6, wherein the constant current unit includes:

a switching unit configured to be connected between the lead leg and the lag leg of the rectifying unit and to be switched using pulsating current output from the rectifier;

a control voltage output unit configured to detect load current flowing in the unidirectional LED module unit and convert switching voltage output from the switching unit according to a magnitude in the detected load current into driving voltage of first and second levels; and

a constant current driver configured to be controlled by the driving voltage of the first or second level to provide constant current.

8. The constant-current-drive LED module device of claim 6, wherein the constant-current-drive unit includes:

a control voltage output unit configured to detect the load current flowing in the bidirectional LED module unit and convert the voltage between the lead leg and the lag leg of the rectifier into the driving voltage of the first and second levels according to the magnitude in the detected load current; and

a constant current driver configured to be controlled by the driving voltage of the first and second levels to provide the constant current.

9. The constant-current-drive LED module device of claim 7, further comprising:

a charging and discharging unit including a resistor-capacitor connected to the bidirectional LED module unit in parallel.

10. The constant-current-drive LED module device of claim 9, wherein the constant current driver is any one of a field effect transistor (FET), a bipolar junction transistor (BJT), and an insulated gate bipolar transistor (IGBT).

12. The constant-current-drive LED module device of claim 9, wherein the control voltage output unit includes:

a detection resistor configured to detect load current flowing in the bidirectional LED module unit; and

a three terminal zener diode configured to output zener voltage that is the driving voltage of the first level when control voltage applied to the detection resistor is a predetermined value or less and output the driving voltage of the second level maintaining a short state between an anode and a cathode when the control voltage exceeds the predetermined value.

14. The constant-current-drive LED module device of claim 9, wherein when the input voltage of the AC power source is fluctuated within a range of 10% of the rated voltage, the load current flowing in the unidirectional LED module unit is fluctuated within a range of 5 to 20%.

16. The constant-current-drive LED module device of claim 9, wherein when the input voltage of the AC power source is fluctuated within a range of 10%, luminous quantity of the bidirectional LED module unit is fluctuated within a range of 9 to 20%.

18. The constant-current-drive LED module device of claim 8, further comprising:

a charging and discharging unit including a resistor-capacitor connected to the bidirectional LED module unit in parallel.