发明名称 |
CIRCUIT FOR AC ADAPTER TO REDUCE POWER DRAWN FROM AN AC POWER SOURCE |
摘要 |
An AC adapter which reduces the amount of power drawn from an AC power source when a system is disconnected from the adapter, includes: a rectifier bridge for rectifying an AC voltage from an AC power supply; a conversion circuit coupled to the rectifier bridge for converting the rectified AC voltage to a DC voltage; and an opto-coupler coupled to the conversion circuit for monitoring an output connection of the circuit, wherein when a system is not coupled to the output connection, the opto-coupler substantially prevents the AC voltage from being drawn from the AC power supply. The adapter circuit uses an opto-coupler comprising a diode and a transistor to reduce the amount of current drawn from an AC power supply when a system is not connected to the AC adapter. In this manner, the AC adapter is prevented from becoming heated when no system is connected.
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申请公布号 |
US2003214822(A1) |
申请公布日期 |
2003.11.20 |
申请号 |
US20030248423 |
申请日期 |
2003.01.17 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
MALIK RANDHIR S;HEMENA WILLIAM;HO DIEP N |
分类号 |
H02J9/00;H02M3/335;(IPC1-7):H02M3/335 |
主分类号 |
H02J9/00 |
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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