Liquid discharging apparatus, head unit, integrated circuit device for capacitive load driving, and capacitive load driving circuit

Patent metadata

Field	Value
Publication number	US-9751303-B2
Application number	US-201615362184-A
Country	US
Kind code	B2
Filing date	Nov 28, 2016
Priority date	Dec 11, 2014
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

There is provided a driving circuit having a modulator which generates a modulation signal pulse-modulated from a source signal; a gate driver which generates an amplification control signal based on the modulation signal; a transistor which generates an amplification modulation signal amplified from the modulation signal based on the amplification control signal; a low pass filter which demodulates the amplification modulation signal and generates a driving signal; a first power source; and a temperature detection portion which detects temperature.

First claim

What is claimed is:

1. A driving circuit for driving a capacitive load, comprising:
a modulator which generates a modulation signal pulse-modulated from a source signal;
a gate driver which generates an amplification control signal based on the modulation signal;
a transistor which generates an amplification modulation signal amplified from the modulation signal based on the amplification control signal;
a low pass filter which demodulates the amplification modulation signal, generates a driving signal, and outputs the driving signal to the capacitive load;
a temperature detector which detects temperature; and
a boosting circuit which supplies a power source to the gate driver,
wherein a distance from the temperature detector to the boosting circuit is shorter than a distance from the temperature detector to the gate driver.

2. The driving circuit for driving a capacitive load, according to claim 1 ,
wherein the boosting circuit is a charge pump circuit.

3. A driving circuit for driving a capacitive load, comprising:
a modulator which generates a modulation signal pulse-modulated from a source signal;
a gate driver which generates an amplification control signal based on the modulation signal;
a transistor which generates an amplification modulation signal amplified from the modulation signal based on the amplification control signal; and
a low pass filter which demodulates the amplification modulation signal, generates a driving signal, and outputs the driving signal to the capacitive load,
wherein the oscillation frequency of the modulation signal is 1 MHz to 8 MHz.

Assignees

• Seiko Epson Corp

Inventors

• Sano Takafumi

Classifications

• B41J2/04593

  Dot-size modulation by changing the size of the drop · CPC title

• B41J2/04588

  using a specific waveform · CPC title

• B41J2/04548

  Details of power line section of control circuit · CPC title

• B41J2/04581

  controlling heads based on piezoelectric elements · CPC title

• B41J2/04563

  detecting head temperature; Ink temperature · CPC title