The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 24, 2020
Filed:
Aug. 08, 2017
Nidec Servo Corporation, Kiryu, JP;
Masatomo Ishikawa, Kiryu, JP;
Masahiro Tsuchiya, Kiryu, JP;
NIDEC SERVO CORPORATION, Gunma, JP;
Abstract
A motor drive circuit includes an upper switch, a lower switch connected in series with the upper switch and drives a brushless DC motor, a gate drive circuit that drives the lower switch and a brake circuit that uses an inductive voltage generated by the brushless DC motor to apply a voltage to a gate terminal of the lower switch via the gate drive circuit and turns on the lower switch. The gate drive circuit includes a push element that applies a predetermined source voltage to the gate terminal when on, a pull element that pulls out charge from the gate terminal when on, and a rectifier between the push element and the gate terminal to rectify current in a direction from the push element toward the gate terminal.