A system and method for the dynamic power control of a ballast, wherein a compander is used to reduce dynamic input range requirements of an analog-to-digital converter (ADC) in power systems having dynamic signal ranges that are several orders of magnitude smaller than the largest signal being sampled....http://www.google.fr/patents/US6577262?utm_source=gb-gplus-shareBrevet US6577262 - Compander for power control in a ballast
