Patent ID: 7358681

Claim:
A driving and control device for providing a desired switched current to a load including a string of one or more electronic devices, 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 a switching signal, said dimming control device responsive to the switching signal for 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; d) a feedback device electrically coupled to said voltage converter, said voltage sensing device and said current sensing device, said feedback device further including a feedback switch responsive to a duty cycle control signal, said feedback device receiving said first signal and generating the control signal based primarily on the first signal when said feedback switch is in an activated state, and said feedback device receiving said second signal and generating the control signal based on the second signal when said feedback switch is in a deactivated state; wherein said voltage converter changes the second magnitude voltage based on the control signal received from the feedback device.