US3769571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power inverter circuit
Assignee: Pioneer Magnetics Inc
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Filing: 1973-03-21
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Granted: 1973-10-30
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Expires: 1993-03-21
Abstract
Abstract A power supply is provided which is capable of operation from either of two power sources, such as on normal power from the usual alternating-current mains, or emergency power from a standby battery; and which will automatically switch from one source to another as the need arises. The power supply includes a transformer having at least two primary windings, and first and second input circuits respectively connected to the two primary windings and to the two sources. The preferred source will be selected by the power supply so long as its voltage is equal to or greater than the voltage of the secondary source.
Inventors
- 👤 B Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:49
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/10; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; Y; Y10; Y10S; Y10S320/00; Y10S320/11
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
An inverter power supply circuit including: a transformer having a first primary winding with N1 turns and a second primary winding with N2 turns; a first input circuit connected to said first primary winding for providing power to said first primary winding from a first power source of voltAge V1; a second input circuit connected to said second primary winding for providing power to said second primary winding from a second power source of voltage V2; and in which the turns ratio N1/N2 of said first and second primary windings is slightly less than the voltage ratio V1/V2 of said first and second power sources; and current blocking means included in said second input circuit to prevent current from being drawn from said second source as long as the voltage V2 is less than the voltage V1.
Claim 2
Dependent Claim
137 words
An inverter power supply circuit including: a transformer having a first primary winding with N1 turns and a second primary winding with N2 turns; a first input circuit connected to said first primary winding for providing power to said first primary winding from a first power source of voltAge V1; a second input circuit connected to said second primary winding for providing power to said second primary winding from a second power source of voltage V2; and in which the turns ratio N1/N2 of said first and second primary windings is slightly less than the voltage ratio V1/V2 of said first and second power sources; and current blocking means included in said second input circuit to prevent current from being drawn from said second source as long as the voltage V2 is less than the voltage V1.
Claim 3
Dependent Claim
18 words
The inverter power supply circuit defined in claim 1, in which said current blocking means is a diode.
Claim 4
Dependent Claim
27 words
The inverter power supply circuit defined in claim 1, in which said transformer has at least one secondary winding, and a load connected to said secondary winding.
Claim 5
Dependent Claim
75 words
The inverter power supply circuit defined in claim 1, and which includes a first pair of switching transistors connected to said first primary winding, and a second pair of switching transistors connected to said second primary winding, a second transformer intercoupling said switching transistors of said first pair, a second transformer intercoupling said switching transistors of said second pair, and a common control circuit synchronously driving the switching transistors of said first and second pairs.
Claim 6
Dependent Claim
36 words
The inverter power supply circuit defined in claim 4, and which includes first shunt filter capacitor means connected in said first input circuit, and a second shunt filter capacitor means connected in said second output circuit.
Claim 7
Dependent Claim
28 words
The inverter power supply circuit defined in claim 5, in which said first source is an alternating-current power source, and said second source is a direct-current power source.
Claim 8
Dependent Claim
50 words
The inverter power supply circuit defined in claim 1, in which said first source is an alternating-current source, and said second source is a direct-current battery, and which includes a charging network for the battery connected in said input circuit for charging the battery when the first source is active.
Claim 9
Dependent Claim
29 words
The inverter circuit defined in claim 7, in which said current blocking means is a diode, and in which said charging network comprises a resistor connected across said diode.
Claim 10
Dependent Claim
27 words
The inverter circuit defined in claim 7, in which said charging network comprises a capacitor connected in said second input circuit, and a resistor shunting said capacitor.
Claim 11
Dependent Claim
32 words
The inverter power supply circuit defined in claim 7, in which said charging network comprises a capacitor connected in said second input circuit, and an active current regulator shunted across said capacitor.
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |