Stochastic signal density modulation for optical transducer control

• US 10,334,672 B2
• Filed: 07/27/2017
• Issued: 06/25/2019
• Est. Priority Date: 11/13/2006
• Status: Active Grant

• Current Assignee: Cypress Semiconductor Corporation (Infineon Technologies AG)
• Original Assignee: Cypress Semiconductor Corporation (Infineon Technologies AG)
• Inventors: Van Ess, David, Prendergast, Patrick N
• Primary Examiner(s): A, Minh D
• Application Number:
  US15/661,795
• Publication Number:
  US 20180098397A1
• Time in Patent Office: 698 Days
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/18 using temperature feedback
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/30 Driver circuits
• CPC Class Codes: H05B 45/46 having LEDs disposed in parallel lines

Abstract

A controller for optical transducers uses stochastic signal density modulation to reduce electromagnetic interference.

Claims

1. A lighting controller comprising:

a plurality of outputs, each of the plurality of outputs coupled to a lighting element; and

a plurality of density modulation circuits coupled to the plurality of outputs, wherein an output of each of the density modulation circuits corresponds to a brightness of a corresponding lighting element.

2. A The lighting controller of claim 1, wherein the plurality of outputs includes:

a first output corresponding to a red lighting element;

a second output corresponding to a blue lighting element; and

a third output corresponding to a green lighting element.

3. A The lighting controller of claim 1, wherein the plurality of density modulation circuits are implemented by a configurable circuit comprising a plurality of programmable digital blocks.

4. A method for generating a lighting output comprising:

driving a first lighting element with a first density signal;

driving a second lighting element with a second density signal; and

driving a third lighting element with a third density signal,

wherein the first, second, and third density signals are controllable to produce a desired combined wavelength for the lighting output.

5. The method for generating a lighting output of claim 4, wherein the first, second, and third density signals are determined by a controller circuit in response to a wavelength input and based on a determined combination of density signals corresponding to the wavelength input.