Electric storage device
First Claim
Patent Images
1. An electric storage device, comprising:
- an input terminal;
a direct current power source connected to the input terminal;
a charge element connected to the input terminal and limiting a direct current from the direct current power source;
a charging current detection unit connected to the charge element and detecting the charging current;
a storage element connected to the charging current detection unit;
a discharge element connected to the storage element;
an output terminal connected to the discharge element;
a voltage detection unit detecting a voltage to be applied to the storage element;
a control unit connected to the voltage detection unit and controlling the charge element and the discharge element;
a voltage comparison unit connected to the voltage detection unit and the control unit; and
a variable reference voltage source connected to the voltage comparison unit, and its magnitude is adjusted therefore,wherein, when an inter-terminal voltage of the storage element exceeds the variable reference voltage source, an overvoltage of the storage element is detected and the charge element is controlled through the control unit to halt the charging current or to limit a magnitude of the charging current, so as to prevent deterioration of the charge element, andwherein the variable reference voltage source is adjusted based on a current value detected by the charging current detection unit.
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Abstract
Electric storage device is provided which is capable of smoothly charging storage elements and reliably detecting an overvoltage of each of the storage elements. Electric storage device includes charging/discharging limiting circuit. Charging/discharging limiting circuit includes charge element, discharge, control unit, charging current detection unit, voltage detection unit, valuable reference voltage source, and voltage comparison unit. A magnitude of valuable reference voltage source that is connected to an input terminal on a first side of voltage comparison unit is adjusted by charging current detection unit. Detection signal from the voltage detection unit is given to an input terminal on a second side of voltage comparison unit.
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Citations
13 Claims
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1. An electric storage device, comprising:
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an input terminal; a direct current power source connected to the input terminal; a charge element connected to the input terminal and limiting a direct current from the direct current power source; a charging current detection unit connected to the charge element and detecting the charging current; a storage element connected to the charging current detection unit; a discharge element connected to the storage element; an output terminal connected to the discharge element; a voltage detection unit detecting a voltage to be applied to the storage element; a control unit connected to the voltage detection unit and controlling the charge element and the discharge element; a voltage comparison unit connected to the voltage detection unit and the control unit; and a variable reference voltage source connected to the voltage comparison unit, and its magnitude is adjusted therefore, wherein, when an inter-terminal voltage of the storage element exceeds the variable reference voltage source, an overvoltage of the storage element is detected and the charge element is controlled through the control unit to halt the charging current or to limit a magnitude of the charging current, so as to prevent deterioration of the charge element, and wherein the variable reference voltage source is adjusted based on a current value detected by the charging current detection unit.
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2. The electric storage device according to claim 1, wherein the variable reference voltage source is adjusted based on detection signals detected by the charging current detection unit and the voltage detection unit.
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3. The electric storage device according to claim 1, further comprising:
an irregular signal generation circuit which outputs an irregular signal when a charging voltage, that is charged by the storage element, exceeds a prescribed inter-terminal voltage of the storage element.
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4. The electric storage device according to claim 1, further comprising:
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a discharge circuit unit discharging a charge which has stored in the storage element when a voltage of the storage element exceeds a prescribed inter-terminal voltage, wherein the storage element is constituted with an electric double layered capacitor.
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5. An electric storage device, comprising:
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an input terminal; a direct current power source connected to the input terminal; a charge element connected to the input terminal and limiting a direct current from the direct current power source; a charging current detection unit connected to the charge element and detecting the charging current; a storage element connected to the charging current detection unit; a discharge element connected to the storage element; an output terminal connected to the discharge element; a voltage detection unit detecting a voltage to be applied to the storage element; a control unit connected to the voltage detection unit and controlling the charge element and the discharge element; a voltage comparison unit connected to the voltage detection unit and the control unit; and a variable reference voltage source connected to the voltage comparison unit, and its magnitude is adjusted therefore, wherein, when an inter-terminal voltage of the storage element exceeds the variable reference voltage source, an overvoltage of the storage element is detected and the charge element is controlled through the control unit to halt the charging current or to limit a magnitude of the charging current, so as to prevent deterioration of the charge element, and wherein the variable reference voltage source is adjusted based on a temperature detected by a temperature detection unit which detects a temperature of the storage element itself or an ambient temperature of a position where the storage element is placed.
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6. The electric storage device according to claim 5, further comprising:
an irregular signal generation circuit which outputs an irregular signal when a charging voltage, that is charged by the storage element, exceeds a prescribed inter-terminal voltage of the storage element.
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7. The electric storage device according to claim 5, further comprising:
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a discharge circuit unit discharging a charge which has stored in the storage element when a voltage of the storage element exceeds a prescribed inter-terminal voltage, wherein the storage element is constituted with an electric double layered capacitor.
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8. An electric storage device, comprising:
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an input terminal; a direct current power source connected to the input terminal; a charge element connected to the input terminal and limiting a direct current from the direct current power source; a charging current detection unit connected to the charge element and detecting the charging current; a storage element connected to the charging current detection unit; a discharge element connected to the storage element; an output terminal connected to the discharge element; a voltage detection unit detecting a voltage to be applied to the storage element; a control unit connected to the voltage detection unit and controlling the charge element and the discharge element; a voltage comparison unit connected to the voltage detection unit and the control unit; and a variable reference voltage source connected to the voltage comparison unit, and its magnitude is adjusted therefore, wherein, when an inter-terminal voltage of the storage element exceeds the variable reference voltage source, an overvoltage of the storage element is detected and the charge element is controlled through the control unit to halt the charging current or to limit a magnitude of the charging current, so as to prevent deterioration of the charge element, and wherein the variable reference voltage source is adjusted based on a time measured by a timer circuit connected to the control unit.
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9. The electric storage device according to claim 8, further comprising:
an irregular signal generation circuit which outputs an irregular signal when a charging voltage, that is charged by the storage element, exceeds a prescribed inter-terminal voltage of the storage element.
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10. The electric storage device according to claim 8, further comprising:
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a discharge circuit unit discharging a charge which has stored in the storage element when a voltage of the storage element exceeds a prescribed inter-terminal voltage, wherein the storage element is constituted with an electric double layered capacitor.
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11. An electric storage device, comprising:
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an input terminal; a direct current power source connected to the input terminal; a charge element connected to the input terminal and limiting a direct current from the direct current power source; a charging current detection unit connected to the charge element and detecting the charging current; a storage element connected to the charging current detection unit; a discharge element connected to the storage element; an output terminal connected to the discharge element; a voltage detection unit detecting a voltage to be applied to the storage element; a control unit connected to the voltage detection unit and controlling the charge element and the discharge element; a voltage comparison unit connected to the voltage detection unit and the control unit; and a variable reference voltage source connected to the voltage comparison unit, and its magnitude is adjusted therefore, wherein, when an inter-terminal voltage of the storage element exceeds the variable reference voltage source, an overvoltage of the storage element is detected and the charge element is controlled through the control unit to halt the charging current or to limit a magnitude of the charging current, so as to prevent deterioration of the charge element, and wherein a charging of the storage element is temporarily halted during the charging, and the variable reference voltage source is adjusted based on a difference in inter-terminal voltage of the storage element before and after the halt of the charging.
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12. The electric storage device according to claim 11, further comprising:
an irregular signal generation circuit which outputs an irregular signal when a charging voltage, that is charged by the storage element, exceeds a prescribed inter-terminal voltage of the storage element.
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13. The electric storage device according to claim 11, further comprising:
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a discharge circuit unit discharging a charge which has stored in the storage element when a voltage of the storage element exceeds a prescribed inter-terminal voltage, wherein the storage element is constituted with an electric double layered capacitor.
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Specification
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Current AssigneePanasonic Corporation (Panasonic Holdings Corporation)
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Original AssigneePanasonic Corporation (Panasonic Holdings Corporation)
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InventorsTakemoto, Junji, Morita, Kazuki, Odajima, Yoshimitu
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Primary Examiner(s)Tso; Edward
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Assistant Examiner(s)Fantu; Yalkew
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Application NumberUS11/918,252Publication NumberTime in Patent Office1,555 DaysField of Search320/166US Class Current320/166CPC Class CodesH02J 7/0018 using separate charge circuitsH02J 7/345 using capacitors as storage...
