An inverter circuit for a battery operated devices includes an EL device that is driven by the inverter circuit. The inverter circuit preserves battery power by recycling battery current stored in the EL device. A charging circuit charges the EL device to a first voltage level during a charge cycle....http://www.google.es/patents/US6157138?utm_source=gb-gplus-sharePatente US6157138 - Apparatus for illuminating an electroluminescent lamp that preserves battery power
Apparatus for illuminating an electroluminescent lamp that preserves battery ...
