Motor-drive circuit

马达驱动电路

Abstract

A motor-drive circuit includes a detection circuit to detect a reverse current to flow in a direction from a first sink-side transistor to a second source-side transistor or in a direction from a second sink-side transistor to a first source-side transistor, a disable circuit to disable a detection output of the detection circuit during a predetermined time period from a start of detection of the reverse current performed by the detection circuit, a first inhibit circuit to inhibit synchronous rectification according to a detection output of the detection circuit when the predetermined time period has elapsed from a start of detection of the reverse current performed by the detection circuit, and a second inhibit circuit.
本发明涉及马达驱动电路,其进行同步整流,包括:检测电路,其检测从第一汇侧晶体管向第二源侧晶体管的方向、或从第二汇侧晶体管向第一源侧晶体管的方向流动的反向电流;无效电路,其在检测电路开始检测反向电流后的规定期间,使检测电路的检测输出无效;第一禁止电路,其在检测电路开始检测反向电流后经过了规定期间的情况下,根据检测电路的检测输出来禁止同步整流;第二禁止电路,其在使第一汇侧晶体管或第二汇侧晶体管导通的PWM信号的各导通占空期间比规定期间短的情况下,与第一禁止电路的动作无关地禁止同步整流。

Claims

Description

Topics

Download Full PDF Version (Non-Commercial Use)

Patent Citations (4)

    Publication numberPublication dateAssigneeTitle
    CN-101282100-AOctober 08, 2008三洋电机株式会社;三洋半导体株式会社马达驱动电路
    CN-102246405-ANovember 16, 2011电方便有限公司Generalized AC-DC synchronous rectification techniques for single- and multi-phase systems
    CN-1862936-ANovember 15, 2006株式会社理光Step-down switching regulator
    US-2008080219-A1April 03, 2008Shohtaroh SohmaSynchronous rectification switching regulator, control circuit for synchronous rectification switching regulator, and control method for same

NO-Patent Citations (0)

    Title

Cited By (0)

    Publication numberPublication dateAssigneeTitle