Capacitive load driving device

Details Capacitive load driving device Capacitive load driving device

2007-09-28

2010-02-23

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C327S111000, C330S010000, C341S151000

Reexamination Certificate

active

07667444

ABSTRACT:
An improved capacitive load driving device that provides increased signal voltage gain, over-voltage, over-current, and over-temperature protections, over-modulation prevention, output level control, minimized harmonic generation, and compensation for propagation medium distortion. The device includes driver/amplifier circuitry, protection circuitry, and an output stage. The driver/amplifier circuitry simultaneously modulates and discretizes an analog input signal by comparing it with a specified digitally-synthesized modulation waveform, which is a repeating series of approximately parabolic waveforms. The resulting PWM waveform is processed to generate a discrete low-harmonic sine wave approximation used to produce gate drive signals for the output stage. The protection circuitry monitors the device for fault conditions, and, in the event a fault condition is detected, controls startup and automatic shutdown. The output stage includes an H-bridge that drives an impedance-matching transformer feeding an inductor. When the device is used to drive a capacitive transducer, the impedance-matching transformer, the inductor, and the transducer form a series-resonant circuit for boosting the signal voltage gain, reducing power consumption, and filtering higher harmonics.

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Pao-Szu Wu, Towards Rom-Less DDFSs On compact digital circuits for accurate sine approximation, Washington State University, School of Electrical Engineering and Computer Science, Dec. 2003.
Raab, Radio Frequency Pulse Width Modulation, IEEE Transactions on Communications, Aug. 1973, pp. 958-966.

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