PIEZO DRIVER HAVING LOW CURRENT QUIESENT OPERATION FOR USE IN A PERSONAL ALERT SAFETY SYSTEM OF A SELF-CONTAINED BREATHING APPARATUS

摘要

Embodiments relate generally to personal alert safety systems (PASS) as well as the use of piezoelectric sound generators which may be located within a PASS device operable to alert others when user is in danger. Some embodiments further relate to the use of a PASS device in an SCBA. Embodiments may also relate to the design of piezoelectric driver circuits operable to sound one or more piezoelectric sound generators, wherein the driver circuit design may be low cost and energy efficient.