US3657569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turn on turn off feedback drive switching circuit
Assignee: Bose Corp
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Filing: 1970-02-19
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Granted: 1972-04-18
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Expires: 1990-02-19
Abstract
Abstract A power transistor turns on and off in response to a switching signal applied to the base of a low level input transistor. Each of turn on and turn off transformers includes a primary winding having a relatively large number of turns, a main secondary winding having a number of turns N and N/2, respectively, and a feedback secondary winding having a number of turns such that the ratio of turns on main to feedback secondary windings is N and N/2, respectively.
Inventors
- 👤 Thomas A Froeschle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:40
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/601; H03K3/00; H03K3/02; H03K3/26; H03K3/30
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
287 words
Apparatus for turning a semiconductor switching means on and off comprising, said semiconductor switching means having at least control and output electrodes, first and second transformer means each having primary, main secondary and feedback secondary winding means, an input terminal, means responsive to a control signal on said input terminal for selectively drawing current through said first transformer means primary winding means to produce currents in said first transformer means main secondary winding means and both said feedback secondary winding means, said feedback secondary winding means being in series with each other and said output electrode, means responsive to the current production in said first transformer means secondary winding means for selectively establishing a current path between said first transformer means main secondary winding means and said control electrode to aid conduction of said semiconductor switching means, said first transformer means primary winding means main secondary winding means and feedback secondary winding means, being poled in relationship to accelerate conduction in said semiconductor switching means, means responsive to the control signal on said input terminal for selectively blocking current flow in both said primary winding means to initiate current flow in said second transformer main secondary winding means in response to current flowing in said second transformer feedback windIng means to thereby tend to reduce the current flowing in said feedback secondary winding means, means responsive to the current blocking in said second transformer means primary winding means for selectively establishing a current flow path between said second transformer means main secondary winding means and said control electrode, said second transformer means primary winding means, feedback and main secondary winding means relatively poled so that reduction in current through said feedback secondary winding means is then accelerated.
Claim 2
Dependent Claim
287 words
Apparatus for turning a semiconductor switching means on and off comprising, said semiconductor switching means having at least control and output electrodes, first and second transformer means each having primary, main secondary and feedback secondary winding means, an input terminal, means responsive to a control signal on said input terminal for selectively drawing current through said first transformer means primary winding means to produce currents in said first transformer means main secondary winding means and both said feedback secondary winding means, said feedback secondary winding means being in series with each other and said output electrode, means responsive to the current production in said first transformer means secondary winding means for selectively establishing a current path between said first transformer means main secondary winding means and said control electrode to aid conduction of said semiconductor switching means, said first transformer means primary winding means main secondary winding means and feedback secondary winding means, being poled in relationship to accelerate conduction in said semiconductor switching means, means responsive to the control signal on said input terminal for selectively blocking current flow in both said primary winding means to initiate current flow in said second transformer main secondary winding means in response to current flowing in said second transformer feedback windIng means to thereby tend to reduce the current flowing in said feedback secondary winding means, means responsive to the current blocking in said second transformer means primary winding means for selectively establishing a current flow path between said second transformer means main secondary winding means and said control electrode, said second transformer means primary winding means, feedback and main secondary winding means relatively poled so that reduction in current through said feedback secondary winding means is then accelerated.
Claim 3
Dependent Claim
43 words
Apparatus in accordance with claim 1 and further comprising reset winding means on each of said transformer means for resetting each of said transformer means at least once during a cycle embracing a turn on and turn off of said semiconductor switching means.
Claim 4
Dependent Claim
46 words
Apparatus in accordance with claim 1 wherein said means for selectively establishing a current path between said first transformer means main secondary winding means and said semiconductor switching means control electrode comprises a first unilaterally conducting device intercoupling the latter winding means and said control electrode.
Claim 5
Dependent Claim
34 words
Apparatus in accordance with claim 3 wherein said means for selectively establishing a current path between said second transforming means main secondary winding means and said control electrode comprises a second unilaterally conducting device.
Claim 6
Dependent Claim
29 words
Apparatus in accordance with claim 4 and further comprising a Zener diode in series with said second unilaterally conducting device between the latter winding means and said control electrode.
Claim 7
Dependent Claim
34 words
Apparatus in accordance with claim 1 wherein said means for selectively establishing a current path between said second transformer means main secondary winding means and said control electrode comprises a second unilaterally conducting device.
Claim 8
Dependent Claim
29 words
Apparatus in accordance with claim 6 and further comprising a Zener diode in series with said second unilaterally conducting device between the latter winding means and said control electrode.
Claim 9
Dependent Claim
52 words
Apparatus in accordance with claim 1 wherein said means for selectively drawing current through said first transformer means primary winding means comprises a second semiconductor switching means having at least a control electrode coupled to said input terminal and coupled to the latter winding means by a first primary unilaterally conducting device.
Claim 10
Dependent Claim
38 words
Apparatus in accordance with claim 8 wherein said means for selectively interrupting current flow comprises said second semiconductor switching means and a second primary unilaterally conducting means intercoupling the latter device and said second transformer means primary winding.
Claim 11
Dependent Claim
26 words
Apparatus in accordance with claim 9 and further comprising a primary Zener diode connected across said second semiconductor switching means for limiting the voltage developed thereacross.
Claim 12
Dependent Claim
48 words
Apparatus in accordance with claim 9 wherein said means for selectively establishing a current path between said first transformer means main secondary winding means and said first semiconductor switching means control electrode comprises a first unilaterally conducting device intercoupling the latter winding means and the latter control electrode.
Claim 13
Dependent Claim
38 words
Apparatus in accordance with claim 11 wherein said means for selectively establishing a current path between said second transforming means main secondary winding means and said first semiconductor switching means control electrode comprises a second unilaterally conducting device.
Claim 14
Dependent Claim
30 words
Apparatus in accordance with claim 12 and further comprising a Zener diode in series with said second unilaterally conducting device between the latter winding means and the latter control electrode.
Claim 15
Dependent Claim
26 words
Apparatus in accordance with claim 13 and further comprising a primary Zener diode connected across said second semiconductor switching means for limiting the voltage developed thereacross.
Claim 16
Dependent Claim
197 words
Apparatus for turning a semiconductor switching means on and off comprising, said semiconductor switching means having at least control and output electrodes, at least turn-on, turn-off and feedback winding means, an input terminal, means responsive to a control signal on said input terminal for producing currents in said turn-on and feedback winding means, said feedback winding means being in series with said semiconductor switching means output electrode, means responsive to the current production in said turn-on winding means for establishing a current path between said turn-on winding means and said control electrode to aid conduction of said semiconductor switching means, said turn-on and feedback winding means being poled in relationship to accelerate conduction in said semiconductor switching means, means responsive to the control signal on said input terminal for producing a current in said turn-off winding means tending to reduce the current flowing in said feedback winding means and for selectively establishing a current flow path between said turn-off winding means and said control electrode to aid nonconduction of said semiconductor switching means, said turn-off winding means and said feedback winding means being relatively poled so that reduction in current through said feedback winding means is accelerated.
Claim 17
Dependent Claim
197 words
Apparatus for turning a semiconductor switching means on and off comprising, said semiconductor switching means having at least control and output electrodes, at least turn-on, turn-off and feedback winding means, an input terminal, means responsive to a control signal on said input terminal for producing currents in said turn-on and feedback winding means, said feedback winding means being in series with said semiconductor switching means output electrode, means responsive to the current production in said turn-on winding means for establishing a current path between said turn-on winding means and said control electrode to aid conduction of said semiconductor switching means, said turn-on and feedback winding means being poled in relationship to accelerate conduction in said semiconductor switching means, means responsive to the control signal on said input terminal for producing a current in said turn-off winding means tending to reduce the current flowing in said feedback winding means and for selectively establishing a current flow path between said turn-off winding means and said control electrode to aid nonconduction of said semiconductor switching means, said turn-off winding means and said feedback winding means being relatively poled so that reduction in current through said feedback winding means is accelerated.
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |