公开(公告)号：JPH0851349A

公开(公告)日：1996-02-20

申请号：JP6279295

申请日：1995-03-22

Applicant: ST MICROELECTRONICS SRL

Inventor： COLANDREA FRANCESCO ,  POLETTO VANNI

IPC: H03K17/08 ,  H03K17/082 ,  H03K17/567 ,  H03K17/687

Abstract: PURPOSE: To provide a protection circuit capable of quickly responding without interrupting a power stage even when rapid overloads are generated. CONSTITUTION: This circuit is supplied with a drive current ID provided with a control terminal G provided with a prescribed control potential and supplied with the drive current ID and provided with a low-speed adjustment loop 11 for measuring an electric amount relating to the drive current ID and generating current limiting signals I1 for adjusting the control potential. Further, it is provided with a high-speed adjustment loop 12 parallelly connected to the low- speed adjustment loop 11 for detecting the high-speed change of the drive current ID and generating fast control signals I2 for quickly reducing the control potential.

公开(公告)号：DE69428884T2

公开(公告)日：2002-06-20

申请号：DE69428884

申请日：1994-03-22

Applicant: ST MICROELECTRONICS SRL

Inventor： COLANDREA FRANCESCO ,  POLETTO VANNI

IPC: H03K17/08 ,  H03K17/082 ,  H03K17/567 ,  H03K17/687

Abstract: The circuit (10) includes two regulating loops connected parallel to each other. The slow regulating loop (11) presents a lower first intervention threshold, and the fast regulating loop (12) a higher second intervention threshold. The slow regulating loop is low-gain and frequency-stable for accurately controlling the maximum value of the current (ID) supplied by the driver (1) in the event of slow overloads or transient states. In the event of rapid overloads, the slow regulating loop fails to intervene effectively, current supply increases rapidly, and the fast regulating loop is turned on to rapidly discharge the parasitic capacitance of the driver (1). The resulting increase in current supply due to instability of the fast loop poses no hazard by virtue of the power transistor being saturated and so permitting effective intervention of the slow regulating loop (linear regulating region) which maintains the output current at the set nominal value.

公开(公告)号：DE69428884D1

公开(公告)日：2001-12-06

申请号：DE69428884

申请日：1994-03-22

Applicant: ST MICROELECTRONICS SRL

Inventor： COLANDREA FRANCESCO ,  POLETTO VANNI

IPC: H03K17/08 ,  H03K17/082 ,  H03K17/567 ,  H03K17/687

Abstract: The circuit (10) includes two regulating loops connected parallel to each other. The slow regulating loop (11) presents a lower first intervention threshold, and the fast regulating loop (12) a higher second intervention threshold. The slow regulating loop is low-gain and frequency-stable for accurately controlling the maximum value of the current (ID) supplied by the driver (1) in the event of slow overloads or transient states. In the event of rapid overloads, the slow regulating loop fails to intervene effectively, current supply increases rapidly, and the fast regulating loop is turned on to rapidly discharge the parasitic capacitance of the driver (1). The resulting increase in current supply due to instability of the fast loop poses no hazard by virtue of the power transistor being saturated and so permitting effective intervention of the slow regulating loop (linear regulating region) which maintains the output current at the set nominal value.