发明名称 |
Single-power-transistor battery-charging circuit using voltage-boosted clock |
摘要 |
A charge/discharge protection circuit protects a battery from inadvertent shorting on a charger node that can connect to a charger or to a power supply of a portable electronic device. A single n-channel power transistor has a gate that controls a channel between the battery and the charger node. The gate is connected to the charger node by a gate-coupling transistor to turn off the power transistor, providing battery isolation. The gate is driven by a voltage-boosted clock through a switch activated by an enable signal. The enable signal also activates a grounding transistor to ground a gate of the gate-coupling transistor. A comparator compares voltages of the charger and battery nodes, and the compare output is latched to generate the enable signal. An inverse enable signal activates a second switch that drives the voltage-boosted clock to the gate of the gate-coupling transistor to turn off the power transistor. |
申请公布号 |
US8643337(B2) |
申请公布日期 |
2014.02.04 |
申请号 |
US201113179107 |
申请日期 |
2011.07.08 |
申请人 |
KWONG KWOK KUEN DAVID;WONG YAT TO WILLIAM;WAN HO MING KAREN;NG CHIK WAI DAVID;HONG KONG APPLIED SCIENCE & TECHNOLOGY RESEARCH INSTITUTE COMPANY LTD. |
发明人 |
KWONG KWOK KUEN DAVID;WONG YAT TO WILLIAM;WAN HO MING KAREN;NG CHIK WAI DAVID |
分类号 |
H02J7/00 |
主分类号 |
H02J7/00 |
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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