发明授权
- 专利标题: Switching control circuit and self-excited DC-DC converter
- 专利标题(中): 开关控制电路和自激式DC-DC转换器
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申请号: US11426273申请日: 2006-06-23
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公开(公告)号: US07379284B2公开(公告)日: 2008-05-27
- 发明人: Iwao Fukushi , Tomoaki Nishi , Takashi Noma
- 申请人: Iwao Fukushi , Tomoaki Nishi , Takashi Noma
- 申请人地址: JP Osaka JP Kyoto
- 专利权人: Sanyo Electric Co., Ltd.,Murata Manufacturing Co., Ltd.
- 当前专利权人: Sanyo Electric Co., Ltd.,Murata Manufacturing Co., Ltd.
- 当前专利权人地址: JP Osaka JP Kyoto
- 代理机构: SoCal IP Law Group LLP
- 代理商 Steven C. Sereboff; John E. Gunther
- 优先权: JP2005-185340 20050624
- 主分类号: H02H3/00
- IPC分类号: H02H3/00 ; G05F1/00
摘要:
A self-excited DC-DC converter comprises a switching element that chops a direct-current input voltage; a smoothing circuit that smoothes the chopped voltage to generate a DC output voltage; a switching control signal generation circuit that generates a switching control signal for the on/off control of the switching element by comparing a feedback voltage of the output voltage and a comparison voltage; an output correction circuit that adjusts the comparison voltage according to an error between the feedback voltage and the reference voltage and, when the output current is in the overcurrent state, reduces the level of the comparison voltage; an overcurrent protection signal generation circuit that, when the output current is in an overcurrent state, generates an overcurrent protection signal for turning off the switching element regardless of the switching control signal; and a delay circuit that delays the overcurrent protection signal. Also, a switching control circuit is provided therein.