Printing device

A printing device comprising:

• an amplifying circuit configured to amplify a drive waveform signal;
• and
• an energy generating element configured to be driven by the drive waveform signal amplified by the amplifying circuit, the energy generating element being configured to eject liquid from a nozzle,
• wherein the amplifying circuit includes:
• a comparator, the drive waveform signal being input to a positive input terminal of the comparator;
• a gate driver, an output signal being input to the gate driver from the comparator;
• a first N-type MOSFET configured to be driven by the gate driver;
• and
• a second N-type MOSFET configured to be driven by the gate driver,
• wherein a drain of the first N-type MOSFET is connected to a power supply,
• wherein a source of the first N-type MOSFET is connected to a drain of the second N-type MOSFET, and
• wherein the printing device further comprises:
• negative feedback wiring configured to connect a negative input terminal of the comparator to the source of the first N-type MOSFET and the drain of the second N-type MOSFET;
• a switch configured to switch between connection and disconnection of an output terminal of the comparator and ground;
• a voltage detector configured to detect an output voltage of the amplifying circuit;
• and
• a controller,
• wherein the controller is configured to close the switch when the voltage detector detects a first voltage with respect to 0 volts.

A printing device comprising:

• an amplifying circuit configured to amplify a drive waveform signal;
• and
• an energy generating element configured to be driven by the drive waveform signal amplified by the amplifying circuit, the energy generating element being configured to eject liquid from a nozzle,
• wherein the amplifying circuit includes:
• a comparator, the drive waveform signal being input to a positive input terminal of the comparator;
• a gate driver, an output signal being input to the gate driver from the comparator;
• a first N-type MOSFET configured to be driven by the gate driver;
• and
• a second N-type MOSFET configured to be driven by the gate driver,
• wherein a drain of the first N-type MOSFET is connected to a power supply,
• wherein a source of the first N-type MOSFET is connected to a drain of the second N-type MOSFET, and
• wherein the printing device further comprises:
• negative feedback wiring configured to connect a negative input terminal of the comparator to the source of the first N-type MOSFET and the drain of the second N-type MOSFET;
• a voltage detector configured to detect an output voltage of the amplifying circuit;
• and
• a controller,
• wherein the gate driver configured to switch between an effective state and an ineffective state, the effective state being a state where the gate driver outputs a signal according to an output from the comparator, the ineffective state being a state where the gate driver does not output a signal according to an output from the comparator, and
• wherein the controller is configured to set the gate driver to the ineffective state when the voltage detector detects a second voltage with respect to 0 volts.