US 2012/0074863 A1 · Method And Apparatus For Driving A Pulse Modulated Output Circuit

Abstract

Light Emitting Diodes (LEDs) are increasingly used in illumination applications. To control multiple Light Emitting Diodes (LEDs), or any other controllable light source, this document introduces a single-wire multiple-LED power and control system. Specifically, individually controlled LED units are arranged in a series configuration that is driven by a control unit located at the head of the series. Each of the individually controlled LED units may comprise more than one LED that is also individually controllable. The head-end control unit provides both electrical power and control signals down a single wire to drive all of the LED units in the series in a manner that allows each LED unit to be controlled individually or in assigned groups.

Claims17

Dependent claims

A electronic circuit for driving a pulse modulated output circuit, said electronic circuit node comprising:

a pulse modulation circuit for generating a series of pulses to said pulse modulated output circuit;
a turn-on delay value, said turn-on delay value corresponding to an amount of energy lost due to said pulses generated by said pulse modulation circuit being imperfect;
a pulse accumulator, said turn-on delay value added to said pulse accumulator each time a pulse is generated by said pulse modulation circuit;
and
an compensation circuit, said compensation circuit adding a unit of on time for said pulse modulation circuit when said pulse accumulator accumulates an amount of energy corresponding to said unit of on time.

2 more elements

Dependencies are inferred from the claim text.

Method And Apparatus For Driving A Pulse Modulated Output Circuit

Life of this patent

Method And Apparatus For Driving A Pulse Modulated Output Circuit

Life of this patent

Abstract

Claims17