Patent US3766403A successfully refreshed from Google Patents.
US3766403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for ensuring dc power supply from either ac or rechargeable dc source
Assignee: Panasonic Holdings Corp
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Filing: 1971-05-23
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Granted: 1973-10-16
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Expires: 1991-05-23
Abstract
Abstract A power supply apparatus for supplying DC power to an electric appliance such as a radio receiver, a television receiver and the like is adapted to be connected selectively to an AC power source or a rechargeable battery for producing DC power, the connection being changeable manually and also automatically when the AC power is interrupted.
Inventors
- 👤 T Tsutsumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:16
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/34; H02J7/90; H02J7/92; H02J7/02; H02J7/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
246 words
A power supply apparatus comprising: rectifier means for converting AC power to DC power and having an input terminal adapted to be connected to an AC power source for receiving said AC power and an output terminal to be connected to a load through a first switch for supplying said DC power thereto; a DC input terminal adapted to be connected to a rechargeable battery; relay means including a relay switch comprising a pair of spaced contacts and an armature for bridging said contacts connected between said output terminal of said rectifier means and said DC input terminal and a relay coil for actuating the armature of said relay switch; an AC detecting circuit having a first output terminal for producing a detecting signal upon detection of the absence of said AC power and a second output terminal for producing said detecting signal upon detection of the presence of said AC power; a driving circuit for energizing said relay coil responsive to said detecting signal, said driving circuit being supplied continuously with power by said battery; and switch means including said first switch and a second switch connected between said driving circuit and said AC detecting circuit, said switch means changeable between a first position where said first switch is closed and said second switch connects said driving circuit to said first output terminal and a second position where said first switch is open and said second switch connects said driving circuit to said second terminal.
Claim 2
Dependent Claim
246 words
A power supply apparatus comprising: rectifier means for converting AC power to DC power and having an input terminal adapted to be connected to an AC power source for receiving said AC power and an output terminal to be connected to a load through a first switch for supplying said DC power thereto; a DC input terminal adapted to be connected to a rechargeable battery; relay means including a relay switch comprising a pair of spaced contacts and an armature for bridging said contacts connected between said output terminal of said rectifier means and said DC input terminal and a relay coil for actuating the armature of said relay switch; an AC detecting circuit having a first output terminal for producing a detecting signal upon detection of the absence of said AC power and a second output terminal for producing said detecting signal upon detection of the presence of said AC power; a driving circuit for energizing said relay coil responsive to said detecting signal, said driving circuit being supplied continuously with power by said battery; and switch means including said first switch and a second switch connected between said driving circuit and said AC detecting circuit, said switch means changeable between a first position where said first switch is closed and said second switch connects said driving circuit to said first output terminal and a second position where said first switch is open and said second switch connects said driving circuit to said second terminal.
Claim 3
Dependent Claim
118 words
A power supply apparatus according to claim 1, wherein said AC detecting circuit comprises a circuit for rectifying said AC power and producing a smoothed DC output, a first transistor having a base applied with said smoothed DC output and an emitter connected to the ground potential, a second transistor having a base and an emitter connected to the collector and emitter of said first transistor, respectively, resistor means connected between said DC input terminal and the connecting point of said collector of said first transistor and said base of said second transistor for receiving DC power from said battery, and said first and second output terminals being connected to said collectors of said second and first transistors.
Claim 4
Dependent Claim
52 words
A power supply apparatus according to claim 1, further comprising an over-charge and over-discharge detecting circuit for producing a detecting signal upon detection of over-charge and over-discharge of said battery, said driving circuit being controlled responsive to said last-mentioned detecting signal and the first-mentioned detecting signal produce by said AC detecting circuit.
Claim 5
Dependent Claim
73 words
A power supply apparatus according to claim 2, further comprising an over-charged and over-discharge detecting circuit for producing a detecting signal upon detection of over-charge and over-discharge of said battery, wherein said driving circuit includes a switching element connected to said first and second output terminals through said second switch for receiving said last-mentioned detecting signal, said switching element producing a signal for energizing said relay coil upon receiving said last-mentioned detecting signal.
Claim 6
Dependent Claim
181 words
A power supply apparatus according to claim 3, wherein said over-charge and over-discharge detecting circuit comprises a first circuit including a first potentiometeR having a first sliding contact, a second circuit including a second potentiometer having a second sliding contact, a third circuit connected to said DC input terminal and including a switching element having a gate electrode and a constant voltage diode connected in series and in reverse polarity to said switching element, said gate electrode being connected to said first sliding contact through a diode, and a transistor having a collector-emitter circuit connected across said gate electrode and one of main electrodes of said switching element, and wherein said switching means further comprises a third switch having a first switch contact connected between said first circuit and said DC input terminal and second switch contact connected between said second circuit and said DC input terminal, said third switch being operative to close said first switch contact at the second position of said switching means and to close said second switch contact at the first position of said switching means.
References Cited (Backward Citations)
US3339081A
Cited
US3573483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |