US4016475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
DC to DC converter
Assignee: West Electric Co Ltd
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Filing: 1975-11-14
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Granted: 1977-04-05
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Expires: 1995-11-14
Abstract
Abstract A DC to DC converter includes a push pull oscillating circuit having a pair of active components, the anodes of which are connected to each end terminal of the primary winding of a saturable inverter transformer. A secondary winding of the saturable inverter transformer is connected to a load through which the output of the secondary winding is positively fed back to the control electrodes through the cathodes of the active components. The whole circuitry is operated by low voltage small dry cells connected between the midpoint of the primary winding and the cathodes of the active components providing high DC output to the load.
Inventors
- 👤 Hiroshi Makino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:55
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3382; H02M3/3384
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
200 words
A DC to DC converter comprising: a saturable inverter transformer having primary and secondary windings; a push-pull oscillation circuit having a pair of transistors whose collectors are connected to opposite end terminals of the primary winding of said saturable inverter transformer respectively; a DC source being connected between the emitters of said transistors and a midpoint of said primary winding of said saturable inverter transformer; a condenser being connected between said secondary winding of said saturable inverter transformer and said emitters of said transistors; a first reactance element connected in series with one terminal of the secondary winding of said saturable inverter transformer; a resistor connected between the collector of one of said transistors and the base of the other transistor; a first diode connected between said first reactance element and the base of one of said transistors, the easy conduction direction of said first diode being towards one side of said condenser; and a second diode connected between the base of the other of said transistors and the other terminal of the secondary winding of said saturable inverter transformer, the easy conduction direction of said second diode being towards said one side of said condenser. (FIGS. 6 and 7)
Claim 2
Dependent Claim
200 words
A DC to DC converter comprising: a saturable inverter transformer having primary and secondary windings; a push-pull oscillation circuit having a pair of transistors whose collectors are connected to opposite end terminals of the primary winding of said saturable inverter transformer respectively; a DC source being connected between the emitters of said transistors and a midpoint of said primary winding of said saturable inverter transformer; a condenser being connected between said secondary winding of said saturable inverter transformer and said emitters of said transistors; a first reactance element connected in series with one terminal of the secondary winding of said saturable inverter transformer; a resistor connected between the collector of one of said transistors and the base of the other transistor; a first diode connected between said first reactance element and the base of one of said transistors, the easy conduction direction of said first diode being towards one side of said condenser; and a second diode connected between the base of the other of said transistors and the other terminal of the secondary winding of said saturable inverter transformer, the easy conduction direction of said second diode being towards said one side of said condenser. (FIGS. 6 and 7)
Claim 3
Dependent Claim
17 words
A DC to DC converter set forth in claim 2 wherein said reactance element is a condenser.
Claim 4
Dependent Claim
33 words
A DC to DC converter set forth in claim 1 further comprising: a second reactance element connected between said DC source and the midpoint of said primary winding of said saturable inverter transformer.
Claim 5
Dependent Claim
19 words
A DC to DC converter set forth in claim 7 wherein said second reactance element is a choke coil.
Claim 6
Dependent Claim
148 words
A DC to DC converter comprising: a saturable inverter transformer having center tapped primary and secondary windings, a pair of transistors, each provided with a base, and emitter and collector, said collectors of said pair of transistors each being separately connected to an opposite end of the primary of said saturable inverter transformer, separate diodes connecting the bases of said pair of transistors separately to opposite ends of the secondary of said transformer, a source of DC voltage connected between the emitters of said pair of transistors and the center tap of the primary of said transformer, and separate r-c circuits cross coupling the base of each transistor of said pair of transistors to the collector of the other member of said pair of transistors, an output of said DC-DC converter being available between the emitters of the transistors and the center tap of the transformer secondary winding.
Claim 7
Dependent Claim
148 words
A DC to DC converter comprising: a saturable inverter transformer having center tapped primary and secondary windings, a pair of transistors, each provided with a base, and emitter and collector, said collectors of said pair of transistors each being separately connected to an opposite end of the primary of said saturable inverter transformer, separate diodes connecting the bases of said pair of transistors separately to opposite ends of the secondary of said transformer, a source of DC voltage connected between the emitters of said pair of transistors and the center tap of the primary of said transformer, and separate r-c circuits cross coupling the base of each transistor of said pair of transistors to the collector of the other member of said pair of transistors, an output of said DC-DC converter being available between the emitters of the transistors and the center tap of the transformer secondary winding.
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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |