Patent ID: 8111012
Filing Date: 2012-02-07
Classification: H02P

Abstract:
1. A method of controlling an inverter voltage outputted by an inverter and used to drive a lamp array, the method comprising: measuring and digitizing the inverter voltage to generate a voltage feedback signal, wherein the inverter voltage varies with frequency according to a transfer function that is dependent on electrical characteristics of components in the inverter; providing the voltage feedback signal to a microcontroller and determining the transfer function, at least in part, from the voltage feedback signal; providing to the microcontroller, in addition to said providing the voltage feedback signal from which the transfer function is determined, a load feedback signal from the lamp array; determining, by the microcontroller based on the transfer function and the voltage feedback signal, a frequency of a digital switch control signal to adjust the inverter voltage to a set point value; and generating the digital switch control signal having the determined frequency.