Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1997-05-07
1999-02-02
LaBalle, Clayton
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310316, 310318, H01L 4104
Patent
active
058669680
ABSTRACT:
A circuit (10) for driving a piezoelectric transformer (12) in a phase locked mode without using an external reference signal. The circuit (10) utilizes a 555 timer circuit operated in a stable mode which is responsive to a feedback phase signal (18) coupled from an output signal (20) of the piezoelectric transformer (12). The feedback phase signal (18) overpowers the trigger circuit of the timer to phase lock the timer to an output of the piezoelectric transformer (12) at a resonant frequency of the piezoelectric transformer (12). The circuit (10) provides a simplified phase lock circuit without the need for a typical PLL configuration.
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Cunningham Gary J.
LaBalle Clayton
Mancini Brian M.
Motorola Inc.
Williams Timothy A
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