发明授权
- 专利标题: Switching power supply unit and semiconductor device for switching power supply
- 专利标题(中): 开关电源单元和开关电源的半导体器件
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申请号: US11180702申请日: 2005-07-14
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公开(公告)号: US07116564B2公开(公告)日: 2006-10-03
- 发明人: Satoru Takahashi
- 申请人: Satoru Takahashi
- 申请人地址: JP Osaka
- 专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人地址: JP Osaka
- 代理机构: Stevens, Davis, Miller & Mosher, LLP
- 优先权: JP2004-211779 20040720
- 主分类号: H02M3/335
- IPC分类号: H02M3/335 ; H02M3/315
摘要:
Overload protecting operation is performed by controlling the current peak value of a switching device 1 through the use of a comparator 8, a NAND circuit 5, and so on according to variations in feedback current being input to a feedback signal control circuit 11, internally setting the overcurrent protection of switching device 1 through the use of a clamp circuit 12, charging a capacitor 34 when having fallen below a specified current smaller than current required for the overcurrent protection for a fixed time period, and detecting rise in voltage VOL at the capacitor 34 to a constant voltage to stop switching operation.By achieving the overload protection under normal load and the overcurrent protection against peak load in a single switching power supply unit, problems such as the complexity of the unit and an increase in the element count of the control circuit are solved.