Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2008-06-27
2010-10-12
Dougherty, Thomas M (Department: 2837)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
Reexamination Certificate
active
07812504
ABSTRACT:
The invention in general relates to Medical Instruments for bone fracture healing, ultrasonic surgery, tissue ablation and cutting and drilling, dry powder inhalers and more particularly to a method to monitor load condition and overall efficiency, safety and reliability of ultrasonic energy delivery using a Class E power Amplifier. Three parameters: frequency (f), duty cycle (D) and Power Amplifier supply voltage (Vdd) are continuously adjusted in order to maintain optimal and suboptimal Class E operation. The load for the power driver can be a single element or a stack. For every frequency and duty cycle of operation the MOSFET drain voltage is compared to a known value which is proportional to Power Amplifier supply voltage Vdd. During the MOSFET OFF part of operation a timer is started when drain voltage falls below a known threshold value. The timer is stopped by the MOSFET leading edge gate clock. A measure of the distance from optimal operation is implemented in the form of a counter value N thus allowing a continuous load monitoring. A one Class E Amplifier clock cycle reaction to fast load change is thus possible and therefore a robust efficient operation, with increased safety and reliability of Ultrasonic power delivery.
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Dougherty Thomas M
Microtrend Systems Inc.
Rosenau Derek J
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