Switched resonant ultrasonic power amplifier system
First Claim
1. A system for controlling an output of an ultrasonic device, the system comprising:
- an amplifier receiving and processing a driver output signal for generating a drive signal that is provided to an ultrasonic device for controlling output of the ultrasonic device;
an output control circuit receiving and processing a signal related to a feedback signal generated by the ultrasonic device and a divider reference signal for generating a compensated clock signal that is adjusted for at least one of phase and frequency differences between the received feedback signal and the divider reference signal; and
a compensated drive circuit receiving and processing the compensated clock signal for generating the divider reference signal, and for generating the driver output signal.
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Abstract
A switched resonant power amplifier system for ultrasonic transducers is disclosed. The system includes an amplifier that receives and processes a driver output signal for generating a drive signal that is provided to an ultrasonic device for controlling output of the ultrasonic device. An output control circuit receives and processes a signal related to a feedback signal generated by the ultrasonic device and a divider reference signal, and generates a compensated clock signal that is adjusted for at least one of phase and frequency differences between the received feedback signal and the divider reference signal. A compensated drive circuit receives and processes the compensated clock signal for generating the divider reference signal, and for generating the driver output signal.
318 Citations
23 Claims
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1. A system for controlling an output of an ultrasonic device, the system comprising:
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an amplifier receiving and processing a driver output signal for generating a drive signal that is provided to an ultrasonic device for controlling output of the ultrasonic device;
an output control circuit receiving and processing a signal related to a feedback signal generated by the ultrasonic device and a divider reference signal for generating a compensated clock signal that is adjusted for at least one of phase and frequency differences between the received feedback signal and the divider reference signal; and
a compensated drive circuit receiving and processing the compensated clock signal for generating the divider reference signal, and for generating the driver output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A system for controlling an output of an ultrasonic device, the system comprising:
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a switched resonant power amplifier receiving and processing a driver output signal for generating a drive signal that is provided to an ultrasonic device for controlling the output of the ultrasonic device;
an output control circuit comprising;
a wave shaping circuit comprising;
a zero crossing detector receiving and processing a feedback signal related to the output of the ultrasonic device and generated by the ultrasonic device, the zero crossing detector generating a corresponding square wave signal; and
a comparator comparing the square wave signal to a reference signal for generating a reset signal having a substantially identical frequency to the feedback signal;
a compensating circuit comprising;
a reference timer for receiving and processing the reset signal for generating a compensated reference signal having substantially the same frequency as the reset signal and substantially 180°
out-of-phase with respect to the reset signal, wherein frequency and amplitude characteristics of the compensated reference signal are determined at least by the reset signal; and
a phase locked loop (PLL) receiving first and second input signals, wherein the first input signal is the compensated reference signal and the second input signal is a divider reference signal, and wherein the PLL processes the first and second input signals for generating a compensated clock signal that is adjusted for at least one of phase and frequency differences between the received first and second input signals; and
a compensated drive circuit operatively coupled to the compensating circuit, the compensated drive circuit comprising;
divider circuitry for stepping down the frequency of the compensated clock signal to a selectable frequency for generating a counter output signal;
flip-flop circuitry for splitting the counter output signal into first and second complementary square waves together forming a driver input signal, wherein a sample of at least one of the first and second complementary square waves is the divider reference signal; and
a driver for amplifying the driver input signal for generating the driver output signal.
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23. A system for controlling an output of an ultrasonic device, the system comprising:
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an amplifier receiving and processing a driver output signal for generating a drive signal that is provided to an ultrasonic device for controlling output of the ultrasonic device;
an output control circuit receiving and processing a signal related to a feedback signal generated by the ultrasonic device and a divider reference signal for generating a compensated clock signal that is adjusted for at least one of phase and frequency differences between the received feedback signal and the divider reference signal; and
a compensated drive circuit comprising;
divider circuitry for stepping down the frequency of the compensated clock signal to a selectable frequency for generating a counter output signal;
flip-flop circuitry for splitting the counter output signal into first and second complementary square waves together forming a driver input signal, wherein a sample of at least one of the first and second complementary square waves is the divider reference signal; and
a driver for amplifying the driver input signal for generating the driver output signal;
wherein the driver comprises a phase delay circuit for selectively adjusting at least one of the phase relationship between the first and second complementary signals of the driver output signal and pulse width of pulses of at least one of the first and second complementary signals of the driver output signal.
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Specification