Analog-to-analog lighting apparatus and methods

• US 7,994,955 B2
• Filed: 06/12/2009
• Issued: 08/09/2011
• Est. Priority Date: 05/02/2007
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Light-Based Technologies Incorporated
• Inventors: Jackson, Verne S., Jackson, Jeanette E.
• Primary Examiner(s): LAUTURE, JOSEPH J
• Application Number:
  US12/484,030
• Publication Number:
  US 20090251074A1
• Time in Patent Office: 788 Days
• Field of Search: 341/133, 341/110, 345/204, 327/12, 315/294, 315/295, 315/297, 315/312, 315/362
• US Class Current: 341/133
• CPC Class Codes: H04J 7/00 Multiplex systems in which the amplitudes or durations of the signals in individual channels are characteristic of those channels
• CPC Class Codes: H04L 25/0264 Arrangements for coupling to transmission lines duplexing arrangements H04L5/14; line equalisers, line build-out devices H04L25/03878
• CPC Class Codes: H04L 25/0272 Arrangements for coupling to multiple lines, e.g. for differential transmission
• CPC Class Codes: H04L 25/49 using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems spectral shaping H04L25/03828
• CPC Class Codes: H04L 25/4902 Pulse width modulation; Pulse position modulation
• CPC Class Codes: H04L 5/16 Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission

Abstract

The invention provides a system of generation of multi-channel analog output signals, from a single analog input signal, and the controlled activation of peripheral devices responsive to the multi-channel analog output signals. A single-channel to multi-channel analog-to-analog converter is provided to convert the single analog input signal to multiple output channels. Uni-directional coupling is used for coupling and mixing the multi-channel outputs and transferring the mixed outputs to a data bus. Signals on the data bus are used to drive the multiple peripheral devices.

Claims

1. Lighting apparatus comprising:

an analog input;

a plurality of analog outputs;

a control circuit configured to provide analog output signals at each of the analog outputs, the control circuit embodying mappings corresponding to each of the analog outputs, the mappings relating values of an analog input signal presented at the analog input to corresponding values of the analog output signals,

wherein, the mappings are such that increasing the value of the analog input signal from a minimum value to a maximum value causes each of the analog output signals to vary according to a corresponding waveform; and

wherein the waveforms each include a ramp portion wherein the corresponding analog output signal ramps up to a peak value and holds at the peak value for a sub-range of values of the analog input signal.

2. Lighting apparatus according to claim 1 wherein, in the ramp portion, the waveforms provide linear relations between the values of the corresponding analog output signal and the values of the analog input signal.

3. Lighting apparatus according to claim 2 wherein one or more of the waveforms comprises a decay region wherein an increase in the value of the analog input signal provides a corresponding decrease in the value of the corresponding analog output signal.

4. Lighting apparatus according to claim 2 wherein one or more of the waveforms is trapezoidal in form.

5. Lighting apparatus according to claim 1 wherein each of the waveforms has at least one energized portion wherein the value of the corresponding output signal is non-zero and wherein the energized portions of at least two of the waveforms overlap.

6. Lighting apparatus according to claim 1 comprising a plurality of drive circuits, a different one of the drive circuits associated with each of the outputs, wherein each drive circuit is connected to apply the output signal to the associated output.

7. Lighting apparatus according to claim 1 comprising three outputs, a first output connected to drive a red light-emitting diode (LED), a second output connected to drive a green light-emitting diode and a third output connected to drive a blue light-emitting diode.

8. Lighting apparatus according to claim 7 wherein the waveforms provide analog output signals for the first, second and third outputs having a ratio of 30:

59;

11 for at least some values of the input signal.

9. Lighting apparatus according to claim 1 comprising a plurality of bus lines, the plurality of bus lines each connected to drive one or more light-emitting diodes, wherein each of the plurality of outputs is coupled to drive at least one of the bus lines.

10. Lighting apparatus according to claim 9 wherein one or more of the plurality of outputs is coupled to drive two or more of the bus lines.

11. Lighting apparatus according to claim 10 wherein:

the bus lines comprise at least first second and third bus lines,

a first one of the outputs is connected to drive the first bus line,

a second one of the outputs is connected to drive the first and second bus lines, and,

a third one of the outputs is connected to drive the first, second and third bus lines.

12. Lighting apparatus according to claim 11 wherein the one or more light-emitting diodes connected to the first bus line emit red light when driven, the one or more light-emitting diodes connected to the second bus line emit green light when driven;

and the one or more light-emitting diodes connected to the third bus line emit blue light when driven.

13. Lighting apparatus according to claim 11 wherein the bus lines comprise a fourth bus line connected to drive a white light-emitting diode and red, green and blue light emitting diodes are each connected to be driven by one of the first, second and third bus lines.

14. Lighting apparatus according to claim 9 comprising a uni-directional coupler connected between the outputs and the bus lines.

15. Lighting apparatus according to claim 9 wherein the bus lines are connected to the light-emitting diodes by way of a gate/interface component, the gate/interface component comprising a gate operative to simultaneously enable or disable all of the light-emitting diodes.

16. Lighting apparatus according to claim 1 wherein, for at least some values of the analog input signal, all of the analog output signals are off.

17. Lighting apparatus according to claim 1 wherein the waveforms are configured such that each of the outputs is off unless the value of the input signal is within a sub-range corresponding to the output.

18. Lighting apparatus according to claim 17 wherein two or more of the waveforms overlap completely.