US5610450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply apparatus for efficiently utilizing battery and electronic apparatus using the power supply
Assignee: Fujitsu Ltd
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Filing: 1995-06-29
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Granted: 1997-03-11
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Expires: 2015-06-29
Abstract
Abstract A booster type DC-DC conversion circuit and a voltage reduction type DC-DC conversion circuit are connected in series with a battery. When battery voltage is high, the booster type DC-DC conversion circuit does not operate, and the voltage reduction type DC-DC conversion circuit outputs a constant voltage lower than the battery voltage. When the battery voltage drops, the booster type DC-DC conversion circuit operates, and converts the battery voltage to a constant voltage higher than the operation voltage of the voltage reduction type DC-DC conversion circuit. The voltage reduction type DC-DC conversion circuit outputs a constant voltage. The power supply apparatus can continuously output a constant voltage from when the battery voltage is high until it becomes low, and can efficiently utilize the battery capacity.
Inventors
- 👤 Mituo Saeki
- 👤 Tsutomu Suzui
- 👤 Hidekiyo Ozawa
- 👤 Hisafumi Mitsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:34
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; H; H02; H02J; H02J2207/00; H02J2207/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
178 words
A power supply apparatus, comprising: a battery; a booster type DC-DC conversion circuit having an input side thereof connected to said battery, for outputting a constant voltage above an input voltage to an output side thereof when the conversion circuit is operation, and passing the input voltage to the output side thereof when the operation of the conversion circuit is inhibited; a voltage reduction type DC-DC conversion circuit having an input side thereof connected to the output side of said booster type DC-DC conversion circuit, for generating a constant voltage lower than the input voltage to an output side thereof; battery voltage detection means for detecting whether the voltage of said battery is above a reference value; and control means for outputting a signal for inhibiting the operation of said booster type DC-DC conversion circuit when said battery voltage detection means detects that the battery voltage is above said reference value, and a signal for operating said booster type DC-DC conversion circuit when said battery voltage detection means detects that the battery voltage is below said reference value.
Claim 2
Dependent Claim
178 words
A power supply apparatus, comprising: a battery; a booster type DC-DC conversion circuit having an input side thereof connected to said battery, for outputting a constant voltage above an input voltage to an output side thereof when the conversion circuit is operation, and passing the input voltage to the output side thereof when the operation of the conversion circuit is inhibited; a voltage reduction type DC-DC conversion circuit having an input side thereof connected to the output side of said booster type DC-DC conversion circuit, for generating a constant voltage lower than the input voltage to an output side thereof; battery voltage detection means for detecting whether the voltage of said battery is above a reference value; and control means for outputting a signal for inhibiting the operation of said booster type DC-DC conversion circuit when said battery voltage detection means detects that the battery voltage is above said reference value, and a signal for operating said booster type DC-DC conversion circuit when said battery voltage detection means detects that the battery voltage is below said reference value.
Claim 3
Dependent Claim
207 words
A power supply apparatus comprising: a battery; a booster type DC-DC conversion circuit having an input side thereof connected to said battery, for outputting a constant voltage above an input voltage to an output side thereof when the conversion circuit is operation, and passing the input voltage to the output side thereof when the operation of the conversion circuit is inhibited; a voltage reduction type DC-DC conversion circuit having an input side thereof connected to the output side of said booster type DC-DC conversion circuit, for generating a constant voltage lower than the input voltage to an output side thereof; external terminals for connecting an external D.C. power supply, connected to the input side of said voltage reduction type DC-DC conversion circuit; external voltage detection means for detecting whether a voltage between said external terminals is above a reference value; battery voltage detection means for detecting whether or not the voltage of said battery is above a reference value; and control means for outputting a signal for operating said booster type DC-DC conversion circuit only when said external voltage detection means detects that the external voltage is below said reference value and said battery voltage detection means detects that the battery voltage is below said reference value.
Claim 4
Dependent Claim
207 words
A power supply apparatus comprising: a battery; a booster type DC-DC conversion circuit having an input side thereof connected to said battery, for outputting a constant voltage above an input voltage to an output side thereof when the conversion circuit is operation, and passing the input voltage to the output side thereof when the operation of the conversion circuit is inhibited; a voltage reduction type DC-DC conversion circuit having an input side thereof connected to the output side of said booster type DC-DC conversion circuit, for generating a constant voltage lower than the input voltage to an output side thereof; external terminals for connecting an external D.C. power supply, connected to the input side of said voltage reduction type DC-DC conversion circuit; external voltage detection means for detecting whether a voltage between said external terminals is above a reference value; battery voltage detection means for detecting whether or not the voltage of said battery is above a reference value; and control means for outputting a signal for operating said booster type DC-DC conversion circuit only when said external voltage detection means detects that the external voltage is below said reference value and said battery voltage detection means detects that the battery voltage is below said reference value.
Claim 5
Dependent Claim
47 words
A power supply apparatus according to claim 2, which further comprises a blocking diode interposed between said external terminal and the input side of said voltage reduction type DC-DC conversion circuit, and a blocking diode interposed between said battery and said voltage reduction type DC-DC conversion circuit.
Claim 6
Dependent Claim
21 words
A power supply apparatus according to claim 2, which further comprises a charger connected between said external terminal and said battery.
Claim 7
Dependent Claim
188 words
An electronic apparatus including a power supply apparatus, said power supply apparatus comprising: a battery; a booster type DC-DC conversion circuit having an input side thereof connected to said battery, for outputting a constant voltage above an input voltage to an output side thereof when the conversion circuit is operation, and passing the input voltage to the output side thereof when the operation of the conversion circuit is inhibited; a voltage reduction type DC-DC conversion circuit having an input side thereof connected to the output side of said booster type DC-DC conversion circuit, for generating a constant voltage lower than an input voltage to an output side thereof; battery voltage detection means for detecting whether or not the voltage of said battery is above a reference value; and control means for outputting a signal for inhibiting the operation of said booster type DC-DC conversion circuit when said battery voltage detection means detects that the battery voltage is above said reference value, and a signal for operating said booster type DC-DC conversion circuit when said battery voltage detection means detects that the battery voltage is below said reference value.
Claim 8
Dependent Claim
188 words
An electronic apparatus including a power supply apparatus, said power supply apparatus comprising: a battery; a booster type DC-DC conversion circuit having an input side thereof connected to said battery, for outputting a constant voltage above an input voltage to an output side thereof when the conversion circuit is operation, and passing the input voltage to the output side thereof when the operation of the conversion circuit is inhibited; a voltage reduction type DC-DC conversion circuit having an input side thereof connected to the output side of said booster type DC-DC conversion circuit, for generating a constant voltage lower than an input voltage to an output side thereof; battery voltage detection means for detecting whether or not the voltage of said battery is above a reference value; and control means for outputting a signal for inhibiting the operation of said booster type DC-DC conversion circuit when said battery voltage detection means detects that the battery voltage is above said reference value, and a signal for operating said booster type DC-DC conversion circuit when said battery voltage detection means detects that the battery voltage is below said reference value.
Claim 9
Dependent Claim
217 words
An electronic apparatus including a power supply apparatus, said power supply apparatus comprising: a battery; a booster type DC-DC conversion circuit having an input side thereof connected to said battery, for outputting a constant voltage above an input voltage to an output side thereof when the conversion circuit is operation, and passing the input voltage to the output side thereof when the operation of the conversion circuit is inhibited; a voltage reduction type DC-DC conversion circuit having an input side thereof connected to the output side of said booster type DC-DC conversion circuit, for generating a constant voltage lower than an input voltage to an output side thereof; external terminals connected to the input side of said voltage reduction type DC-DC conversion circuit, for connecting an external D.C. power supply; external voltage detection means for detecting whether or not a voltage between said external terminals is above a reference value; battery voltage detection means for detecting whether or not the voltage of said battery is above a reference value; and control means for outputting a signal for operating said booster type DC-DC conversion circuit only when said external voltage detection means detects that the external voltage is blow the reference value and said battery voltage detection means detects that the battery voltage is below the reference value.
Claim 10
Dependent Claim
217 words
An electronic apparatus including a power supply apparatus, said power supply apparatus comprising: a battery; a booster type DC-DC conversion circuit having an input side thereof connected to said battery, for outputting a constant voltage above an input voltage to an output side thereof when the conversion circuit is operation, and passing the input voltage to the output side thereof when the operation of the conversion circuit is inhibited; a voltage reduction type DC-DC conversion circuit having an input side thereof connected to the output side of said booster type DC-DC conversion circuit, for generating a constant voltage lower than an input voltage to an output side thereof; external terminals connected to the input side of said voltage reduction type DC-DC conversion circuit, for connecting an external D.C. power supply; external voltage detection means for detecting whether or not a voltage between said external terminals is above a reference value; battery voltage detection means for detecting whether or not the voltage of said battery is above a reference value; and control means for outputting a signal for operating said booster type DC-DC conversion circuit only when said external voltage detection means detects that the external voltage is blow the reference value and said battery voltage detection means detects that the battery voltage is below the reference value.
Claim 11
Dependent Claim
46 words
An electronic apparatus according to claim 6, which further comprises a locking diode interposed between said external terminal and the input side of said voltage reduction type DC-DC conversion circuit, and a blocking diode interposed between said battery and said voltage reduction type DC-DC conversion circuit.
Claim 12
Dependent Claim
20 words
An electronic apparatus according to claim 6, which further comprises a charger connected between said external terminal and said battery.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-03-10 | 2000-09-09 | 2001-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-10 | 2004-09-09 | 2005-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-10 | 2008-09-09 | 2009-03-11 | $7700.00 | Window Closed / Lapsed |