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    • 10. 发明公开
    • Power transistor overcurrent protection circuit
    • Überstromschutzschaltungfüreinen Leistungstransistor。
    • EP0599455A2
    • 1994-06-01
    • EP93307423.9
    • 1993-09-20
    • KABUSHIKI KAISHA TOSHIBATOSHIBA FACTORY AUTOMATION SYSTEMS ENGINEERING CORPORATION
    • Okado, Chihiro, c/o Intellectual Property Div.Hideshima, Makoto, c/o Intellectual Property Div.
    • H02H3/08
    • H03K17/78H03K17/0822H03K17/0828H03K17/18H03K17/605
    • An overcurrent protection circuit for a power transistor for flowing a main current in response to a gate drive voltage generated by a gate circuit. The overcurrent protection circuit includes a current detection circuit for detecting the main current flowing in the power transistor to generate a detection voltage corresponding to the main current, and a level detection circuit connected to receive the detection voltage for generating a control current corresponding to a difference between the detection voltage and a prescribed value when the detection voltage exceeds the prescribed value. The overcurrent protection circuit further includes a current control circuit connected to receive the control current for limiting the main current by regulating the gate drive voltage based on the control current, and a drive instruction control circuit connected to receive the control current for making the main current zero by controlling the gate drive voltage to an OFF condition based on the control current.
    • 一种用于功率晶体管的过电流保护电路,用于响应由栅极电路产生的栅极驱动电压使主电流流动。 过电流保护电路包括电流检测电路,用于检测在功率晶体管中流动的主电流以产生对应于主电流的检测电压;以及电平检测电路,其连接以接收用于产生对应于差的控制电流的检测电压 当检测电压超过规定值时,检测电压与规定值之间。 过电流保护电路还包括电流控制电路,其连接以通过基于控制电流调节栅极驱动电压来接收用于限制主电流的控制电流;以及驱动指令控制电路,其被连接以接收控制电流以使主电流 基于控制电流将栅极驱动电压控制为OFF状态为零。