Battery protection integrated circuit and circuit characteristic setting method
First Claim
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1. A battery protection IC, includingan overcharge detection circuit configured to detect an overcharge of a secondary battery,an over-discharge detection circuit configured to detect an over-discharge of the secondary battery,an overcurrent detection circuit configured to detect an overcurrent of the secondary battery,a control circuit configured to protect the secondary battery, by controlling charging and discharging the secondary battery when at least one fault is detected among the overcharge, the over-discharge and the overcurrent, anda delay circuit configured to generate a delay time to be passed before controlling charging and discharging the secondary battery after the fault has been detected,comprising:
- a memory unit configured to store both data of characteristic setting data for setting a circuit characteristic of the battery protection IC, and characteristic adjustment data for adjusting an individual difference of the circuit characteristic of the battery protection IC; and
a setting circuit configured to automatically set the circuit characteristic, and to adjust the individual difference, based on both of said data output from the memory unit,wherein the memory unit includesa set of a pair of non-volatile memory cells to complementarily store one bit, and a latch circuit having direct cross-coupled connections with outputs of the pair of memory cells, provided for each bit of both of said data,wherein the latch circuit automatically statically outputs the data stored in the memory cells provided for both of said data to the setting circuit when a power source of the battery protection IC rises.
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Abstract
A battery protection IC has detection circuits to detect faults of an overcharge, an over-discharge, and an overcurrent of a secondary battery; a control circuit to protect the secondary battery, by controlling (dis)charging the secondary battery upon the fault; and a delay circuit to generate delay after the fault before the controlling. The IC includes a memory unit to store data for setting and adjusting a circuit characteristic of the IC; and a setting circuit to set and adjust the circuit characteristic, based on the data from the memory unit. The memory unit includes a pair of non-volatile memory cells to complementarily store one bit, and a latch circuit directly cross-coupled with the memory cells, for each bit of the data. The latch circuit statically outputs the data from the memory cells to the setting circuit when the IC is turned on.
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Citations
11 Claims
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1. A battery protection IC, including
an overcharge detection circuit configured to detect an overcharge of a secondary battery, an over-discharge detection circuit configured to detect an over-discharge of the secondary battery, an overcurrent detection circuit configured to detect an overcurrent of the secondary battery, a control circuit configured to protect the secondary battery, by controlling charging and discharging the secondary battery when at least one fault is detected among the overcharge, the over-discharge and the overcurrent, and a delay circuit configured to generate a delay time to be passed before controlling charging and discharging the secondary battery after the fault has been detected, comprising: -
a memory unit configured to store both data of characteristic setting data for setting a circuit characteristic of the battery protection IC, and characteristic adjustment data for adjusting an individual difference of the circuit characteristic of the battery protection IC; and a setting circuit configured to automatically set the circuit characteristic, and to adjust the individual difference, based on both of said data output from the memory unit, wherein the memory unit includes a set of a pair of non-volatile memory cells to complementarily store one bit, and a latch circuit having direct cross-coupled connections with outputs of the pair of memory cells, provided for each bit of both of said data, wherein the latch circuit automatically statically outputs the data stored in the memory cells provided for both of said data to the setting circuit when a power source of the battery protection IC rises. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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2. A battery protection IC, including
an overcharge detection circuit configured to detect an overcharge of a secondary battery, an over-discharge detection circuit configured to detect an over-discharge of the secondary battery, an overcurrent detection circuit configured to detect an overcurrent of the secondary battery, a control circuit configured to protect the secondary battery, by controlling charging and discharging the secondary battery when at least one fault is detected among the overcharge, the over-discharge and the overcurrent, and a delay circuit configured to generate a delay time to be passed before controlling charging and discharging the secondary battery after the fault has been detected, comprising: -
a memory unit configured to store at least one of data among characteristic setting data for setting a circuit characteristic of the battery protection IC, and characteristic adjustment data for adjusting an individual difference of the circuit characteristic of the battery protection IC; and a setting circuit configured to automatically set the circuit characteristic, and to adjust the individual difference, based on said one of data output from the memory unit, wherein the memory unit includes a set of a pair of non-volatile memory cells to complementarily store one bit, and a latch circuit having direct cross-coupled connections with outputs of the pair of memory cells, provided for each bit of said one of data, wherein the latch circuit automatically statically outputs the data stored in the memory cells provided for said one of data to the setting circuit when a power source of the battery protection IC rises.
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9. A circuit characteristic setting method executed in a battery protection IC configured to protect a secondary battery, by controlling charging and discharging the secondary battery, after a delay time has passed since at least one fault has been detected among an overcharge of a secondary battery, an over-discharge of the secondary battery, and an overcurrent of the secondary battery,
the method comprising: -
having a memory unit output at least one of data among characteristic setting data for setting a circuit characteristic of the battery protection IC, and characteristic adjustment data for adjusting an individual difference of the circuit characteristic of the battery protection IC, to have a setting circuit automatically set the circuit characteristic, or adjust the individual difference, wherein the memory unit includes a set of a pair of non-volatile memory cells to complementarily store one bit, and a latch circuit having direct cross-coupled connections with outputs of the pair of memory cells, provided for each bit of said one of data, and automatically statically outputting the data stored in the memory cells provided for said one of data to the setting circuit when a power source of the battery protection IC rises.
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10. A battery protection IC, including
an overcharge detection circuit configured to detect an overcharge of a secondary battery, an over-discharge detection circuit configured to detect an over-discharge of the secondary battery, an overcurrent detection circuit configured to detect an overcurrent of the secondary battery, a control circuit configured to protect the secondary battery, by controlling charging and discharging the secondary battery when at least one fault is detected among the overcharge, the over-discharge and the overcurrent, and a delay circuit configured to generate a delay time to be passed before controlling charging and discharging the secondary battery after the fault has been detected, comprising: -
a memory unit configured to store at least one of data among characteristic setting data for setting a circuit characteristic of the battery protection IC, and characteristic adjustment data for adjusting an individual difference of the circuit characteristic of the battery protection IC; and a setting circuit configured to automatically set the circuit characteristic, and to adjust the individual difference, based on said one of data output from the memory unit, wherein the memory unit includes a set of a pair of non-volatile memory cells to complementarily store one bit, and a latch circuit having cross-coupled connections with outputs of the pair of memory cells, provided for each bit of said one of data, wherein the latch circuit automatically statically outputs the data stored in the memory cells provided for said one of data to the setting circuit when a power source of the battery protection IC rises, wherein the latch circuit includes a first MOS transistor of a first conductive type, and a second MOS transistor of the first conductive type, cross-coupled and connected with each other, wherein the latch circuit further includes a first MOS transistor of a second conductivity type inserted between the first MOS transistor of the first conductive type and one of the pair of memory cells, and having a control terminal connected with a control terminal of the first MOS transistor of the first conductive type, and a second MOS transistor of the second conductivity type inserted between the second MOS transistor of the first conductive type and another of the pair of memory cells, and having a control terminal connected with a control terminal of the second MOS transistor of the first conductive type.
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11. A battery protection IC, including
an overcharge detection circuit configured to detect an overcharge of a secondary battery, an over-discharge detection circuit configured to detect an over-discharge of the secondary battery, an overcurrent detection circuit configured to detect an overcurrent of the secondary battery, a control circuit configured to protect the secondary battery, by controlling charging and discharging the secondary battery when at least one fault is detected among the overcharge, the over-discharge and the overcurrent, and a delay circuit configured to generate a delay time to be passed before controlling charging and discharging the secondary battery after the fault has been detected, comprising: -
a memory unit configured to store at least one of data among characteristic setting data for setting a circuit characteristic of the battery protection IC, and characteristic adjustment data for adjusting an individual difference of the circuit characteristic of the battery protection IC; and a setting circuit configured to automatically set the circuit characteristic, and to adjust the individual difference, based on said one of data output from the memory unit, wherein the memory unit includes a set of a pair of non-volatile memory cells to complementarily store one bit, and a latch circuit having cross-coupled connections with outputs of the pair of memory cells, provided for each bit of said one of data, wherein the latch circuit automatically statically outputs the data stored in the memory cells provided for said one of data to the setting circuit when a power source of the battery protection IC rises, wherein the latch circuit includes a first MOS transistor of a first conductive type, and a second MOS transistor of the first conductive type, cross-coupled and connected with each other, wherein the latch circuit further includes a first MOS transistor of a second conductivity type inserted between a memory power supply and one of the pair of memory cells, and having a control terminal connected with a control terminal of the first MOS transistor of the first conductive type, and a second MOS transistor of the second conductivity type inserted between the memory power supply and another of the pair of memory cells, and having a control terminal connected with a control terminal of the second MOS transistor of the first conductive type.
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Specification
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Current AssigneeMitsumi Electric Co., Ltd. (Minebea Mitsumi, Inc.)
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Original AssigneeMitsumi Electric Co., Ltd. (Minebea Mitsumi, Inc.)
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InventorsKageyama, Ryota, Yamauchi, Tsutomu, Tanaka, Nobuhito, Takeda, Takashi, Satake, Yoshihiro, Yamaguchi, Takeshi, Koshimizu, Koji, Kawaguchi, Norihito
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Primary Examiner(s)Pacheco, Alexis
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Application NumberUS14/953,544Publication NumberTime in Patent Office645 DaysField of Search320118, 320132, 320134, 320136, 320162, 324427, 324433, 307 18US Class CurrentCPC Class CodesH02J 7/0016 using shunting, discharge o...H02J 7/00302 Overcharge protectionH02J 7/00304 Overcurrent protectionH02J 7/00306 Overdischarge protectionH02J 7/0031 using battery or load disco...H02J 7/0071 with a programmable schedule
