PIEZOELECTRIC PRINT HEAD DRIVE WITH ENERGY RECOVERY

摘要

An energy recovery circuit in a printhead includes at least one waveform rail, an array of piezoelectric actuators that are selectively electrically connectable to the waveform rail, the piezoelectric actuators generating a capacitive load, at least one capacitive pseudo-nozzle load that is selectively coupled to the waveform rail, depending on the number of piezoelectric actuators connected to the waveform rail and a first inductor coupled to the waveform rail, the first inductor forming a resonant circuit with a waveform rail capacitance and returning energy to a power supply. A method for energy recovery in a printhead includes providing a waveform for an array of piezoelectric actuators that are selectively electrically connectable to a waveform rail, selectively coupling at least one pseudo nozzle load to the waveform rail depending on the number of piezoelectric actuators that are involved the waveform rail, and using an inductor to form a resonant circuit with a waveform rail capacitance and return energy to a power supply.