US4016479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency power converter drive circuit
Assignee: International Business Machines Corp
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Filing: 1975-03-28
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Granted: 1977-04-05
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Expires: 1995-03-28
Abstract
Abstract A push pull inverter has a pair of chopper transistors connected to opposite ends of a center tapped primary of an output transformer and off drive clamps for turning the chopper transistors off alternately under the control of an oscillator. On drive is provided entirely by feedback derived from a secondary winding on the transformer and coupled to the base circuits of the chopping transistors. When the oscillator causes one transistor to be clamped off, the resulting reversal of polarities in the transformer delivers on-drive to the other transistor base. Since the off-switching of the first transistor causes the on-switching of the second transistor in a sequential manner, the two can never be on at the same time, despite the effects of minority carrier storage in the switching transistors.
Inventors
- 👤 George A. Reible, Jr.
- 👤 George D. Sevigny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:49
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
170 words
In a push-pull switching circuit, a pair of conduction control means each having a controlled conduction circuit and a control input terminal, a source of input power, push-pull inductive means connecting said conduction control means across said source for alternative operation of said inductive means in opposite senses as one and the other of said conduction means conduct in alternation, feedback means coupled to said inductive means to bias the first of said conduction means into conduction when the second of said conduction means turns off and to continue such bias during the continuance of conduction of said first conduction means, and vice versa, said feedback means including means connected to block operation thereof from communicating turn-off signals to either of said control terminals, alternating input signal means, said coupling means adapted to communicate turn-off signals from said input signal means to said control terminals in alternation, whereby said circuit operates in push-pull oscillation at the frequency determined by said input signal means and under the power of said source.
Claim 2
Dependent Claim
170 words
In a push-pull switching circuit, a pair of conduction control means each having a controlled conduction circuit and a control input terminal, a source of input power, push-pull inductive means connecting said conduction control means across said source for alternative operation of said inductive means in opposite senses as one and the other of said conduction means conduct in alternation, feedback means coupled to said inductive means to bias the first of said conduction means into conduction when the second of said conduction means turns off and to continue such bias during the continuance of conduction of said first conduction means, and vice versa, said feedback means including means connected to block operation thereof from communicating turn-off signals to either of said control terminals, alternating input signal means, said coupling means adapted to communicate turn-off signals from said input signal means to said control terminals in alternation, whereby said circuit operates in push-pull oscillation at the frequency determined by said input signal means and under the power of said source.
Claim 3
Dependent Claim
43 words
A circuit in accordance with claim 1, wherein said inductive means comprises a transformer having primary winding means, comprising two halves, and wherein each of said half and a respective one of said conduction control means is connected in series across said source.
Claim 4
Dependent Claim
61 words
A circuit in accordance with claim 2, wherein said primary winding means is a center tapped winding having its center tap connected to one side of said source, and said conduction control means are transistors connected to the other side of said source, said transistors being operated by said feedback means and said turn-off signals between high and low impedance states.
Claim 5
Dependent Claim
18 words
A circuit in accordance with claim 3, wherein said transistors are operated between essentially saturated and cut-off states.
Claim 6
Dependent Claim
17 words
A circuit in accordance with claim 3, wherein said alternating input means comprises a lower power oscillator.
Claim 7
Dependent Claim
16 words
A circuit in accordance with claim 5, wherein said oscillator is a square wave multivibrator means.
Claim 8
Dependent Claim
54 words
A circuit in accordance with claim 2, wherein said feedback means comprises secondary winding means on said transformer, and the said blocking means in said feedback means comprises a pair of unidirectionally conducting means interposed respectively between said secondary winding means and said control terminal of a respective one of said conduction control means.
Claim 9
Dependent Claim
56 words
A circuit according to claim 2, further including a bias source and a network connecting said source to said control inputs, and wherein said coupling means for said alternating input signal means comprises alternatively operative means connected to said network and operative individually to clamp said control input terminals to their conduction control means turn-off level.
Claim 10
Dependent Claim
59 words
A circuit according to claim 3, further including a bias source and a network connecting said source to said control inputs, and wherein said coupling means for said alternating input signal means comprises a pair of means connected to said network and operative in opposite phase to clamp said control input terminals to their conduction control means turn-off level.
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 |