Patent ID: 11919298
Assignee: SEIKO EPSON CORPORATION
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B  H | IPC B  H

Claim 0:
1. A driving circuit that outputs a driving signal for driving a driving section, the driving circuit comprising:
a modulation circuit configured to modulate a base driving signal that is a base of the driving signal and output a modulation signal;
an amplification circuit configured to output, from a first output point, an amplified modulation signal obtained by amplifying the modulation signal;
a level shift circuit configured to output, from a second output point, a level-shift amplified modulation signal obtained by shifting a potential of the amplified modulation signal; and
a demodulation circuit configured to demodulate the level-shift amplified modulation signal and output the driving signal, wherein
the amplification circuit includes a first gate driver that outputs, based on the modulation signal, a first gate signal and a second gate signal, a first transistor that has one end electrically coupled to the first output point and that operates based on the first gate signal, and a second transistor that has one end electrically coupled to the first output point and the other end to which a first power source voltage is supplied and that operates based on the second gate signal,
the level shift circuit includes a second gate driver that outputs, based on the base driving signal, a third gate signal and a fourth gate signal, a third transistor that has one end electrically coupled to the second output point and the other end electrically coupled to the first output point and that operates based on the third gate signal, a fourth transistor that has one end electrically coupled to the second output point and that operates based on the fourth gate signal, a first capacitance element that has one end electrically coupled to the first output point and the other end electrically coupled to the other end of the fourth transistor, and a second capacitance element that has one end electrically coupled to the one end of the fourth transistor and the other end which is electrically coupled to the second gate driver and to which a second power source voltage is supplied,
the driving signal includes a first period in which a first potential is fixed, a second period in which a second potential higher than the first potential is fixed, and a third period in which a third potential higher than the second potential is fixed, and
the second gate driver outputs, in the second period, the third gate signal for controlling the third transistor to be conductive and the fourth gate signal for controlling the fourth transistor to be nonconductive.