Charge control circuit
First Claim
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1. A charge control circuit comprising:
- an excess charge detecting circuit and a charge changeover circuit of a secondary battery operated by an electromotive force of a power device, said excess charge detecting circuit being connected between a first line connected to both a positive terminal of said power device and a positive terminal of said secondary battery and a second line connected to a negative terminal of said power device, said excess charge detecting circuit comprising a first stage having a source of a first P channel MOSFET connected to the first line, a gate thereof connected to a negative terminal of the secondary battery and a drain thereof connected to both a drain and a gate of a first N channel MOSFET connected to the second line, a second stage having a source of a second N channel MOSFET connected to the second line, a gate thereof connected to the drain of the first N channel MOSFET and a drain thereof connected to the first line by way of a resistor, and a third stage having a source of a second P channel MOSFET connected to the first line, a gate thereof connected to the drain of the second N channel MOSFET, a drain thereof connected to a drain of a third N channel MOSFET, a gate of the third N channel MOSFET connected to the drain of the first N channel MOSFET and a source of the third N channel MOSFET connected to the second line.
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Abstract
A charge control circuit has an excess charge detecting circuit for preventing the excess charge of a secondary battery responsive to the voltage of the secondary battery, and a switching circuit responsive to the output of the excess charge detecting circuit. The switching circuit and the excess charge detecting circuit are operated by the electromotive force of a solar cell without the power dissipation of the secondary battery.
31 Citations
2 Claims
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1. A charge control circuit comprising:
- an excess charge detecting circuit and a charge changeover circuit of a secondary battery operated by an electromotive force of a power device, said excess charge detecting circuit being connected between a first line connected to both a positive terminal of said power device and a positive terminal of said secondary battery and a second line connected to a negative terminal of said power device, said excess charge detecting circuit comprising a first stage having a source of a first P channel MOSFET connected to the first line, a gate thereof connected to a negative terminal of the secondary battery and a drain thereof connected to both a drain and a gate of a first N channel MOSFET connected to the second line, a second stage having a source of a second N channel MOSFET connected to the second line, a gate thereof connected to the drain of the first N channel MOSFET and a drain thereof connected to the first line by way of a resistor, and a third stage having a source of a second P channel MOSFET connected to the first line, a gate thereof connected to the drain of the second N channel MOSFET, a drain thereof connected to a drain of a third N channel MOSFET, a gate of the third N channel MOSFET connected to the drain of the first N channel MOSFET and a source of the third N channel MOSFET connected to the second line.
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Specification
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Current AssigneeKabushiki Kaisha Daini Seikosha
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Original AssigneeKabushiki Kaisha Daini Seikosha
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InventorsTabata, Junichi
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Primary Examiner(s)Shoop, William M.
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Application NumberUS06/284,345Time in Patent Office816 DaysField of Search320/11, 320/39, 320/40, 368/205, 340/636US Class Current320/162CPC Class CodesH02J 7/35 with light sensitive cells
