Liquid ejection device and liquid ejection surgical instrument
View Patent ↗A liquid ejection device includes: a drive waveform generator generating a drive waveform signal; a modulator performing pulse modulation on a signal from the drive waveform generator to provide a modulated signal; a digital power amplifier performing power amplification on the modulated signal to provide an amplified digital signal; a Lowpass Filter smoothing the amplified digital signal to provide a drive signal of an actuator; a compensator advancing the phase of the drive signal to provide a negative feedback signal; and a subtractor providing a differential signal between the drive waveform signal and the negative feedback signal as an input signal to the modulator.
1. A surgical instrument comprising:
a drive waveform generator generating a drive waveform signal;
a modulator performing pulse modulation on a signal from the drive waveform generator to provide a modulated signal;
a digital power amplifier performing power amplification on the modulated signal to provide an amplified digital signal;
a lowpass filter smoothing the amplified digital signal to provide a drive signal of an actuator;
a compensator advancing a phase of the drive signal to provide a negative feedback signal; and
a subtractor providing a differential signal between the drive waveform signal and the negative feedback signal as an input signal to be inputted to the modulator.
2. The surgical instrument according to claim 1 , further comprising:
an inverse filter provided between the drive waveform generator and the subtractor and correcting the frequency characteristic of a closed loop formed of the modulator, the digital power amplifier, the lowpass filter, the capacitance of the actuator, and the compensator so as to be constant in a predetermined frequency domain.
3. A medical device comprising the surgical instrument according to claim 1 .