Switched resonant ultrasonic power amplifier system
First Claim
1. A system for controlling an output of an ultrasonic device, the system comprising:
- a switched resonant power amplifier adapted to generate a drive signal that is provided to an ultrasonic device to control the output of the ultrasonic device in response to a drive output signal;
an output control circuit including a phase locked loop (PLL) receiving first and second input signals, wherein the PLL processes the first and second input signals to generate 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 configured to generate a counter output signal based on the compensated clock signal, the compensated drive circuit including;
flip-flop circuitry adapted to split 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 second input signal; and
a driver adapted to amplify the driver input signal and generate 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.
791 Citations
17 Claims
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1. A system for controlling an output of an ultrasonic device, the system comprising:
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a switched resonant power amplifier adapted to generate a drive signal that is provided to an ultrasonic device to control the output of the ultrasonic device in response to a drive output signal; an output control circuit including a phase locked loop (PLL) receiving first and second input signals, wherein the PLL processes the first and second input signals to generate 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 configured to generate a counter output signal based on the compensated clock signal, the compensated drive circuit including; flip-flop circuitry adapted to split 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 second input signal; and a driver adapted to amplify the driver input signal and generate the driver output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for controlling an output of an ultrasonic device, the method comprising:
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generating a drive signal to control the output of an ultrasonic device in response to a drive output signal; providing first and second input signals to an output control circuit including a phase locked loop (PLL), wherein the PLL processes the first and second input signals and generate 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 generating a counter output signal based on the compensated clock signal; splitting the counter output signal into first and second complementary square waves together forming a driver input signal at flip-flop circuitry, wherein a sample of at least one of the first and second complementary square waves is the second input signal; and amplifying the driver input signal to generate the driver output signal. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification