LIQUID DISCHARGING APPARATUS, HEAD UNIT, CAPACITIVE LOAD DRIVING CIRCUIT, AND CONTROL METHOD OF CAPACITIVE LOAD DRIVING CIRCUIT

摘要

A liquid discharging apparatus includes a modulation portion that generates a modulation signal obtained by pulse-modulating a source signal; an amplifier that includes a gate driver generating an amplification control signal based on the modulation signal, a bootstrap circuit supplying power to the gate driver, a power source circuit supplying power to the gate driver and the bootstrap circuit, and a transistor generating the amplification modulation signal that is obtained by amplifying the modulation signal based on amplification control signal; a low-pass filter that generates the driving signal by demodulating the amplification modulation signal; a piezoelectric element that is displaced by applying the driving signal; and a control portion that controls an operation of the amplifier. The control portion performs a second process of starting an amplification operation of the amplifier after a first process of performing supply of power to the bootstrap circuit.

主权项

1. A liquid discharging apparatus comprising:
a modulation portion that generates a modulation signal obtained by pulse-modulating a source signal; an amplifier that includes a gate driver generating an amplification control signal based on the modulation signal, a bootstrap circuit supplying power to the gate driver, a power source circuit supplying power to the gate driver and the bootstrap circuit, and a transistor generating the amplification modulation signal that is obtained by amplifying the modulation signal based on amplification control signal; a low-pass filter that generates the driving signal by demodulating the amplification modulation signal; a piezoelectric element that is displaced by applying the driving signal; a cavity of which an inside is filled with a liquid and an internal volume is changed by displacement of the piezoelectric element; a nozzle that communicates with the cavity and discharges the liquid on the inside of the cavity as liquid droplets in accordance with the change in the internal volume of the cavity; and a control portion that controls an operation of the amplifier, wherein the control portion performs a second process of starting an amplification operation of the amplifier after a first process of performing supply of power to the bootstrap circuit by starting an operation of the power source circuit.