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1. 发明公开

EP0823681A3 Soft-start switch with voltage regulation and current limiting 失效
标题翻译：开关软启动电压调节和限流
公开(公告)号：EP0823681A3
公开(公告)日：1998-08-12
申请号：EP97305603.9
申请日：1997-07-25
申请人： DATA GENERAL CORPORATION
发明人： Goerke, Ulrich B , Pieper, Mark S.
IPC分类号： G05F1/46
CPC分类号： G05F1/575 , G05F1/468 , Y10S323/901
摘要： A MOSFET (10), an op-amp (20), a comparator circuit (110), and voltage dividers (170,180) with capacitors (150,240) are employed in combination to effectuate a soft-start switch with current limiting. The transconductance of the MOSFET is employed so that no sense resistor is required. The MOSFET and op-amp are configured as a closed-loop feedback circuit in which the output of the op-amp is coupled to the gate (12) of the MOSFET and the inverting input (24) of the op-amp is coupled to the output of the soft-start switch via a voltage divider. A first RC circuit (144,250) provides a voltage to the non-inverting input of the op-amp which can be triggered to gradually rise from a value close to zero to some reference voltage so as to soft-start a load. Current limiting means are effectuated by a comparator circuit and voltage dividers (170,180) with capacitors. The current limiting means brings the MOSFET to an OFF state and the non-inverting input of the op-amp close to zero volts if the op-amp charges a second RC circuit so that the voltage drop across its capacitor exceeds a pre-determined limit-reference, and also, once the current limiting means brings the MOSFET to the OFF state, the current limiting means allows the soft-start switch to begin a soft-start power-up after a pre-determined time dependent upon the time constant of the second RC circuit.

2. 发明公开

EP0823681A2 Soft-start switch with voltage regulation and current limiting 失效
标题翻译： Schalterfürweichen开始mit Spannungsregelung und Strombegrenzung
公开(公告)号：EP0823681A2
公开(公告)日：1998-02-11
申请号：EP97305603.9
申请日：1997-07-25
申请人： DATA GENERAL CORPORATION
发明人： Goerke, Ulrich B , Pieper, Mark S.
IPC分类号： G05F1/46
CPC分类号： G05F1/575 , G05F1/468 , Y10S323/901
摘要： A MOSFET (10), an op-amp (20), a comparator circuit (110), and voltage dividers (170,180) with capacitors (150,240) are employed in combination to effectuate a soft-start switch with current limiting. The transconductance of the MOSFET is employed so that no sense resistor is required. The MOSFET and op-amp are configured as a closed-loop feedback circuit in which the output of the op-amp is coupled to the gate (12) of the MOSFET and the inverting input (24) of the op-amp is coupled to the output of the soft-start switch via a voltage divider. A first RC circuit (144,250) provides a voltage to the non-inverting input of the op-amp which can be triggered to gradually rise from a value close to zero to some reference voltage so as to soft-start a load. Current limiting means are effectuated by a comparator circuit and voltage dividers (170,180) with capacitors. The current limiting means brings the MOSFET to an OFF state and the non-inverting input of the op-amp close to zero volts if the op-amp charges a second RC circuit so that the voltage drop across its capacitor exceeds a pre-determined limit-reference, and also, once the current limiting means brings the MOSFET to the OFF state, the current limiting means allows the soft-start switch to begin a soft-start power-up after a pre-determined time dependent upon the time constant of the second RC circuit.
摘要翻译：开关包括用于控制电流的电压控制电流装置，其中第二和第三端子分别耦合到开关的输入和输出。电流在第二和第三端子之间流动并且响应于第一和第三端子之间的电压差。用于调节开关输出端的电压的控制装置具有耦合到当前装置的第一端子的输出端。开关输出端的电压被控制为跟随控制装置输入端的电压。电流限制器向控制装置提供输入低或高阻抗对地，其中提供低阻抗使得控制装置强制当前装置进入关闭状态。当控制装置输出与当前装置的第三端之间的电压差超过阈值时，提供低阻抗，以限制当前装置的第二和第三端之间的电流。

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