发明授权
- 专利标题: Temperature compensated circuit for controlling load current
- 专利标题(中): 用于控制负载电流的温度补偿电路
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申请号: US782218申请日: 1991-10-24
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公开(公告)号: US5237262A公开(公告)日: 1993-08-17
- 发明人: Donald J. Ashley , Mark K. DeMoor , Paul W. Graf
- 申请人: Donald J. Ashley , Mark K. DeMoor , Paul W. Graf
- 申请人地址: NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: NY Armonk
- 主分类号: G05F1/567
- IPC分类号: G05F1/567 ; G05F1/573 ; H01H47/32 ; H01L27/02 ; H02M3/156
摘要:
A temperature compensated control circuit includes a load transistor which passes the load current and has an on-resistance which varies with temperature. To provide temperature compensation, first and second pilot transistors are integrated with the load transistor such that as the load transistor heats-up due to the load current passing through the on-resistance of the load transistor, the first and second pilot transistors heat-up due to heat conduction from the load transistor. Each of the pilot transistors has an on-resistance which varies proportionally or similarly to the on-resistance of the load transistor. A first current source supplies a first level of current to the on-resistance of the first pilot transistor to develop a first reference voltage, and a second current source supplies a second level of current to the on-resistance of the second pilot transistor to develop a second reference voltage. The range between the first and second reference voltages corresponds to an acceptable range of load current. A voltage corresponding to the load current is sensed across the load transistor, and the control circuit controls the load current to maintain the sensed voltage within the range.
公开/授权文献
- US5938045A Classifying device 公开/授权日:1999-08-17
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