Steve Jobs


“Scattering Cold Illuminating Light Source (SCILS)”, 1999.
“LED Illumination Control System (ICS)”, 2001.
“Illumination Control System for Light Emitters”, 2003.
“Improvements to Lighting Control Systems”, 2003.
“Collimated Illumination System using an Extended Apparent Source Size" 2008.
"Power-Configurable, High Reliability Hybrid Control System" 2011.
"Power control system for an illumination system", 2012

“Illumination Control System”, 2001.

Granted UK, GB 2 369 730 and 1 433 363 (E); Granted Australia No: 2002321596; Granted Czech Republic No: 1 433 363 (E); Granted Denmark No: 1 433 363 (E); Granted France No: 1 433 363 (E); Granted Germany No: 602 31 418.6; Granted Ireland No: 1 433 363 (E); Granted Italy No: 1 433 363 (E); Granted Luxembourg No: 1 433 363 (E); Granted Monaco No: 1 433 363 (E); Granted Netherlands No: 1 433 363 (E); Granted Sweden No: 1 433 363 (E); Granted Switzerland No: 1 433 363 (E); Granted USA No US 6 963 175.

Filed: 30th August, 2001; expires 28th August, 2022

The Illumination control system (ICS) IPR provides a means for controlling an LED light fixture with one or more coloured LED channels and incorporates a microprocessor to provide closed-loop control along with a means to control intensity and colour through the use of a communication module.

click image to enlarge

Patent areas covered:

  • Pulse Amplitude Modulation current control.
  • Closed-Loop feedback
  • LED Lighting Fixture design
  • The use of a microprocessor
  • Temperature & Current Feedback
  • Colour mixing
  • Variable Maximum Forward Current User setting
  • Communication including DMX
  • External synchronisation 
  • Variable Frequency and Duty Cycle

Claim 1: An illumination control system for driving
one or more light sources which comprises a
microprocessor controlling pulse amplitude
modulated (PAM) voltage controlled current circuit.

The illumination control system offers the following benefits:

  • This patent enables both pulse frequency and duty cycle to be varied as well as the current amplitude.

  • A Pulse Amplitude Modulated signal becomes DC/CCR when the duty cycle of the signal becomes 100% thus enabling the patent to cover DC driving.

  • May use the duty cycle of the PAM signal as a means to compensate for LED junction temperature to add LED fixture protection.

  • The maximum forward current may be programmed easily which enable drivers to be very flexible in terms of what LED system they can work with.

  • Improved colour mixing as all LED channels are energised at the same time

  • Greater colour point stability e.g.; CCT, Red, Green, Blue, Amber as they are dimmed.

  • LEDs can be made to appear up to twice as bright if they are pulsed (Link to “pulse driven LEDs have higher apparent brightness” in LEDs magazine article in May 2008)

click image to enlarge

Figure from the US Patent which
shows one configuration of the
control system (right)

click image to enlarge

Figure detailing a schematic of one
particular implementation of the
Illumination Control System Patent
showing an SSL fixture unit
including casing, heat sink and
optical lens. (right)