Patent ID: 7202608
Filing Date: 2007-04-10
Classification: H05B

Abstract:
1. A driving and control device for providing a desired switched current to a load including a string of one or more light emiting diodes, said device comprising: a) a voltage converter adapted for connection to a power supply, said voltage converter for converting voltage from the power supply from a first magnitude voltage to a second magnitude voltage, said voltage converter responsive to a control signal; b) a dimming control device receiving said second magnitude voltage and controlling transmission of the second magnitude voltage to said string thereby controlling activation of said string; c) a voltage sensing device electrically connected to the output of said voltage converter to generate a first signal and a current sensing device in series with said string to generate a second signal indicative of current flowing though said string; and d) a feedback device electrically coupled to said voltage converter, said voltage sensing device and said current sensing device, said feedback device receiving said first and second signals and providing the control signal to the voltage converter, said control signal based on the first and second signals; wherein said voltage converter changes the second magnitude voltage based on the control signal received from the feedback device.