Modular LED lighting system having emergency light function

• US 10,143,064 B2
• Filed: 04/11/2011
• Issued: 11/27/2018
• Est. Priority Date: 04/09/2010
• Status: Active Grant

• Current Assignee: Tridonic AG (Zumtobel Group AG), Tridonic UK, Ltd. (Zumtobel Group AG)
• Original Assignee: Tridonic AG (Zumtobel Group AG), Tridonic UK, Ltd. (Zumtobel Group AG)
• Inventors: Zimmermann, Michael, Keller, Ueli, Wilson, Ian
• Primary Examiner(s): Amrany, Adi
• Application Number:
  US13/639,881
• Publication Number:
  US 20130147269A1
• Time in Patent Office: 2,787 Days
• Field of Search: 307 64, 307 66
• CPC Class Codes: H02J 9/02 in which an auxiliary distribution system and its associated lamps are brought into service
• CPC Class Codes: H02J 9/061 for DC powered loads
• CPC Class Codes: H05B 45/327 Burst dimming
• CPC Class Codes: H05B 45/3725 Switched mode power supply [SMPS]
• CPC Class Codes: H05B 45/382 with galvanic isolation between input and output
• CPC Class Codes: H05B 45/39 Circuits containing inverter bridges
• CPC Class Codes: H05B 45/46 having LEDs disposed in parallel lines
• CPC Class Codes: H05B 47/10 Controlling the light source
• CPC Class Codes: H05B 47/18 via data-bus transmission
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The invention relates to a modular LED lighting unit, comprising a first module (1) to which an AC supply voltage (9) can be supplied and which comprises: a second sub-module (B), at the output of which a DC supply voltage (5) is provided which is galvanically isolated from the AC supply voltage (9), and a control unit (G), further comprising a second module (2) which comprises a further sub-module (C) supplied with the DC supply voltage (5) of the first module (1), in particular a pulsed constant current source, which is controlled by a control unit (E) of the second module (2), an LED module (F) which has at least one LED range (8) and is supplied by the further sub-module (C), inn particular a constant current source, and an emergency light operating circuit which is connected to a rechargeable energy store (ES); and takes over powering the modular LED lighting unit in the event of failure of the AC supply voltage (9).

Claims

1. A modular LED lighting having a first module (1) and a second module (2), an emergency light operating circuit, a rechargeable energy store (ES), an LED module (F), and a communication interface (6),

wherein the first module (1) is configured to be supplied with a first AC supply voltage (9) and wherein the first module (1) comprises:

a first submodule (A), a second submodule (B) and a control unit (G), wherein the first submodule (A) is configured for being supplied with the AC supply voltage (9) and for providing DC voltage to a second submodule (B),

wherein the second submodule (B) comprises

a half bridge inverter comprising a series connection of a first switch (S1) with a second switch (S2), wherein the half bridge inverter is configured and arranged to receive the first DC voltage from the first submodule (A),

a storage capacitance (23) connected to a first rectifier (22) and a third submodule (C) of the second module (2),

a transformer (19) having a primary winding and a first secondary winding inductively coupled to the primary winding,

the first rectifier (22) being configured to convert a second AC voltage applied at the first secondary winding into a second DC voltage and being connected to the storage capacitance (23) and the first secondary winding of the transformer (19),

a measuring resistor (24),

a resonant circuit (15) comprising a series connection of a first inductance (16) with a coupling capacitor (17), wherein the first inductance (16) is connected to a point between the first and second switch and connected to the coupling capacitor (17), and the coupling capacitor (17) is further connect to a first end of the primary winding, wherein a second end of the primary winding is connected to ground as well as to the measuring resistor (24),

wherein the measuring resistor (24) is arranged in a series connection with the first and second switch and at the same time connected to ground as well as to the second end of the primary winding;

wherein the control unit (G) is configured and arranged to generate drive signals for clocking the first and second switch based on a voltage drop at the measuring resistor (24),

wherein the second module (2) comprises;

a control unit (E),

the third submodule (C), wherein, during a normal operation, the third submodule (C) is configured and arranged for being supplied with the second DC voltage that is output by the second submodule (B) of the first module (1) and that is supplied to the third submodule (C) from the second submodule (B) of the first module (1) to the third submodule (C), thereby providing a power supply (5) from the second submodule (B) of the first module (1) to the third submodule (C),

wherein the LED module (F), which has at least one LED path (8), is configured and arranged for being supplied by the third submodule (C), wherein the control unit (E) is configured and arranged to control the supply based on feedback values supplied from the LED module (F) to the control unit (E),

wherein the first module (1) and the second module (2) are configured and arranged to communicate via the communication interface (6),

wherein a charging circuit of the emergency light operating circuit comprises a second secondary winding (83) inductively coupled to the first secondary winding of the transformer (19) and a second rectifier (84) connected to the first secondary winding and connected to the rechargeable energy store (ES), wherein the second rectifier (84) is configured to convert a third AC voltage applied at the first secondary winding into a third DC voltage by means of which the rechargeable energy store (ES) is recharged in the normal operation;

wherein a discharge circuit (81) of the emergency light operating circuit is configured and arranged to use the rechargeable energy store (ES) to take over a feeding of the LED module (F) in an event of failure of the first AC supply voltage (9), wherein the discharge circuit (81) is coupled to the second submodule (B) of the first module (1) and, in the event of failure of the first AC supply voltage (9), is configured to feed the second module (2) via said power supply (5) from the second submodule (B) of the first module (1) to the further submodule (C) used during the normal operation, and

wherein, in the event of failure of the first AC supply voltage (9), the first module (1) is configured to transmit a control command via the communication interface (6) and the second module (2) is configured to adapt its operation in response to the transmission of the control command.

2. The LED lighting as claimed in claim 1, wherein an external communication unit (10) is connected to the first module (1) and wherein, in the event of failure of the AC supply voltage (9), the external communication (10) is maintained.

3. The LED lighting as claimed in claim 2, wherein the external communication (10) is maintained in accordance with the DALI standard.

4. The LED lighting as claimed in claim 1, wherein, in the event of failure of the AC supply voltage (9), the internal communication between the first module (1) and the second module (2) is still maintained.

5. The LED lighting as claimed in claim 1, wherein the emergency light operating circuit, in the event of failure of the AC supply voltage (9), supplies the second module (2) with a voltage level deviating from the normal DC supply voltage (5) of the first module (1), wherein the second module (2) identifies this deviation and alters the operation of the LED module (F).

6. The LED lighting as claimed in claim 5, wherein the second module (2) switches over to an emergency light brightness value and/or to an emergency light color, in particular if the second module (2) receives no control signals from the first module (1).

7. The LED lighting as claimed in claim 1, wherein the rechargeable energy store (ES) has a capacitor.

8. The LED lighting as claimed in claim 7, wherein the capacitor is a “

Gold-Cap”

.

9. The LED lighting as claimed in claim 1, wherein the LED lighting is operable for dimming and a color change in the event of failure of the AC-supply voltage (9).

10. The LED lighting as claimed in claim 1, wherein in the second module (2) is a lamp management module.

11. The LED lighting as claimed in claim 1, wherein the further sub-module (C) is a clocked constant-current source.

12. The LED lighting as claimed in claim 1, wherein the emergency light operating circuit also provides a second voltage supply (Vccs) to the control unit (E) of the second module (2).

13. The LED lighting as claimed in claim 1, wherein the internal data communication is standardized, or is independent of an external communication (11) connecting the first module (1) to a bus (10).

14. The LED lighting as claimed in claim 1, wherein the discharge circuit (81) has a buck-boost converter.