发明名称 |
DC to DC converter producing output voltage exhibiting rise and fall characteristics independent of load thereon |
摘要 |
A direct-current to direct-current conversion (DC/DC) apparatus includes a control circuit having an error amplifier for voltage control and controlling a direct-current to direct-current conversion based on a pulse width modulation control using an output of the error amplifier. The error amplifier inputs a voltage signal corresponding to an output voltage of a DC/DC result and a plurality of reference voltage signals. The DC/DC apparatus also includes a soft start capacitor to provide one of the plurality of reference voltage signals. The error amplifier amplifies a difference between the voltage signal corresponding to the output voltage of a DC/DC result and a voltage signal of a lower potential among the plurality of reference voltage signals and, based on the amplified output, carries out the pulse width modulation control. Furthermore, the control circuit includes a circuit for discharging charges corresponding to the output voltage of the DC/DC result when a power supply to the control circuit is turned off. By the constitution, it is possible to easily realize power turn-on/turn-off sequence controls without requiring any special logic circuit, and thus to control rise/fall characteristics of the output voltage without depending on the load.
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申请公布号 |
US6147477(A) |
申请公布日期 |
2000.11.14 |
申请号 |
US19970884082 |
申请日期 |
1997.06.27 |
申请人 |
FUJITSU LIMITED |
发明人 |
SAEKI, MITSUO;YANO, HIDETOSHI;OZAWA, HIDEKIYO;KITAGAWA, SEIYA;MATSUYAMA, TOSHIYUKI;MATSUMOTO, TAKASHI;TAKIMOTO, KYUICHI;SANO, YOSHIAKI |
分类号 |
H02M3/155;G05F1/40;H02M1/00;H02M1/36;H02M3/156;(IPC1-7):G05F1/40 |
主分类号 |
H02M3/155 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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