US 11,813,860 B2
Drive circuit and liquid ejecting apparatus
Kunio Tabata, Shiojiri (JP); Noritaka Ide, Shiojiri (JP); and Shoichiro Yokoo, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION
Filed by Seiko Epson Corporation, Tokyo (JP)
Filed on Nov. 30, 2021, as Appl. No. 17/537,596.
Claims priority of application No. 2020-199479 (JP), filed on Dec. 1, 2020.
Prior Publication US 2022/0169014 A1, Jun. 2, 2022
Int. Cl. B41J 2/045 (2006.01); H03K 17/687 (2006.01)
CPC B41J 2/04541 (2013.01) [B41J 2/0455 (2013.01); B41J 2/04501 (2013.01); B41J 2/04581 (2013.01); H03K 17/6871 (2013.01); B41J 2/04596 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A drive circuit that outputs a drive signal driving a drive portion, the circuit comprising:
a first switching circuit that outputs a first pulse signal from a first output point;
a second switching circuit that outputs a second pulse signal from a second output point;
a first bootstrap circuit that is electrically coupled to the first switching circuit and the second switching circuit and outputs a first voltage to the second switching circuit; and
a smoothing circuit that smooths the second pulse signal and outputs the drive signal, wherein
the first bootstrap circuit includes
a first capacitive element of which one end is electrically coupled to the first output point, and
a first diode of which a second voltage is supplied to an anode terminal, and a cathode terminal is electrically coupled to the other end of the first capacitive element,
the first switching circuit includes
a first gate driver that outputs a first gate signal and a second gate signal based on a reference drive signal which is a reference of the drive signal,
a first transistor of which the second voltage is supplied to one end, and the other end is electrically coupled to the first output point, and which is driven based on the first gate signal, and
a second transistor of which one end is electrically coupled to the first output point and which is driven based on the second gate signal,
the second switching circuit includes
a second gate driver that outputs a third gate signal and a fourth gate signal based on the reference drive signal,
a third transistor of which the first voltage is supplied to one end, and the other end is electrically coupled to the second output point, and which is driven based on the third gate signal,
a fourth transistor of which one end is electrically coupled to the second output point, and the other end is electrically coupled to the first output point, and which is driven based on the fourth gate signal, and
a second bootstrap circuit that supplies a third voltage to the second gate driver, and
the second bootstrap circuit includes
a second capacitive element of which one end is electrically coupled to the second output point and the other end is electrically coupled to the second gate driver, and
a second diode of which the first voltage is supplied to an anode terminal and a cathode terminal is electrically coupled to the other end of the second capacitive element.