US3657572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power converter with self-synchronization and bias
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1970-11-20
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Granted: 1972-04-18
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Expires: 1990-11-20
Abstract
Abstract A power converter having a self-synchronized commutator that causes the power pass transistor in the converter to very rapidly assume its completely turned off state when converter power output is no longer desired. Also provided is apparatus for the converter which supplies base drive to the power pass transistor in response to a triggering pulse. The base drive apparatus has a feed back transistor bias circuit which includes a starting gate that allows the converter to operate during the first several cycles until bias by the bias circuit is provided.
Inventors
- 👤 Sidney E Millman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:13
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/04; H03K17/042; H03K17/0424; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H03K17/041; H03K17/0412; H03K17/04126
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
101 words
In a regulated power supply of the type having input and output terminals, a ground terminal, and a first transistor switch having its collector connected to said input terminal and its emitter connected to said output terminal and responsive to base drive, the improvement comprising: a second transistor switch having its collector connected to the base of said first transistor switch, and its emitter connected in common with said emitter of said first transistor; and circuit means connected to said output terminal, ground terminal, and the base of said second transistor switch for providing base drive to said second transistor switch.
Claim 2
Dependent Claim
101 words
In a regulated power supply of the type having input and output terminals, a ground terminal, and a first transistor switch having its collector connected to said input terminal and its emitter connected to said output terminal and responsive to base drive, the improvement comprising: a second transistor switch having its collector connected to the base of said first transistor switch, and its emitter connected in common with said emitter of said first transistor; and circuit means connected to said output terminal, ground terminal, and the base of said second transistor switch for providing base drive to said second transistor switch.
Claim 3
Dependent Claim
51 words
The improvement set forth in claim 1 wherein said circuit means comprises: unidirectional current conducting means interconnecting said output terminal and the base of said second transistor switch; and a series combination of a capacitor and a resistor coupled between the base of said second transistor switch and said ground terminal.
Claim 4
Dependent Claim
14 words
The improvement of claim 2 wherein said unidirectional current conducting means comprises: a diode.
Claim 5
Dependent Claim
87 words
In combination comprising: input and output terminals; a common input-output terminal; a first NPN-transistor having a collector connected to said input terminal, and an emitter connected to said output terminal; a second NPN-transistor having a collector connected to the base of said first transistor, and an emitter connected to said output terminal; a diode interconnecting said output terminal and the base of said second transistor; and a series arrangement of a resistor and a capacitor interconnecting the base of said second transistor and said common input-output terminal.
Claim 6
Dependent Claim
87 words
In combination comprising: input and output terminals; a common input-output terminal; a first NPN-transistor having a collector connected to said input terminal, and an emitter connected to said output terminal; a second NPN-transistor having a collector connected to the base of said first transistor, and an emitter connected to said output terminal; a diode interconnecting said output terminal and the base of said second transistor; and a series arrangement of a resistor and a capacitor interconnecting the base of said second transistor and said common input-output terminal.
Claim 7
Dependent Claim
68 words
In a regulated power supply of the type consisting of a switch power pass circuit, a drive circuit, a flyback averaging filter, and a controller, the improvement comprising: a transistor switch connected between said power pass circuit and said filter; a diode connected between emitter and base of said transistor switch; and a series combination of a capacitor and a resistor for providing base drive to said transistor.
Claim 8
Dependent Claim
68 words
In a regulated power supply of the type consisting of a switch power pass circuit, a drive circuit, a flyback averaging filter, and a controller, the improvement comprising: a transistor switch connected between said power pass circuit and said filter; a diode connected between emitter and base of said transistor switch; and a series combination of a capacitor and a resistor for providing base drive to said transistor.
Claim 9
Dependent Claim
126 words
In combination comprising: input and output terminals; a common input-output terminal; an inductor having a primary winding; an NPN-transistor having a collector connected to said input terminal, and an emitter connected through said primary winding to said output terminal; a PNP-transistor having a collector connected to the base of said NPN-transistor; a diode having an anode connected to said input terminal and a cathode connected To the emitter of said PNP-transistor; and a secondary winding on said inductor having one end directly connected to said input terminal and another end connected to said input terminal through a series arrangement of a unidirectional current conducting means and capacitor means, the interconnecting junction of said current conducting and capacitor means being connected to the emitter of said PNP-transistor.
Claim 10
Dependent Claim
126 words
In combination comprising: input and output terminals; a common input-output terminal; an inductor having a primary winding; an NPN-transistor having a collector connected to said input terminal, and an emitter connected through said primary winding to said output terminal; a PNP-transistor having a collector connected to the base of said NPN-transistor; a diode having an anode connected to said input terminal and a cathode connected To the emitter of said PNP-transistor; and a secondary winding on said inductor having one end directly connected to said input terminal and another end connected to said input terminal through a series arrangement of a unidirectional current conducting means and capacitor means, the interconnecting junction of said current conducting and capacitor means being connected to the emitter of said PNP-transistor.
Claim 11
Dependent Claim
132 words
In combination comprising: input and output terminals; a common input-output terminal; an inductor having primary and secondary windings; a transistor switch connected to said input terminal through said primary winding to said output terminal and responsive to base drive; means connected to said output terminal, common input-output terminal, and the base of said transistor switch for pulling excess minority carriers out of the base of said transistor switch; means coupled to said input terminal, common input-output terminal, primary winding and the base of said transistor switch for providing base drive to said transistor switch in response to a triggering pulse; means coupled to said secondary winding for providing regulated bias voltage; and means for adding the regulated bias voltage to said input; so that base drive is provided for said transistor switch.
Claim 12
Dependent Claim
132 words
In combination comprising: input and output terminals; a common input-output terminal; an inductor having primary and secondary windings; a transistor switch connected to said input terminal through said primary winding to said output terminal and responsive to base drive; means connected to said output terminal, common input-output terminal, and the base of said transistor switch for pulling excess minority carriers out of the base of said transistor switch; means coupled to said input terminal, common input-output terminal, primary winding and the base of said transistor switch for providing base drive to said transistor switch in response to a triggering pulse; means coupled to said secondary winding for providing regulated bias voltage; and means for adding the regulated bias voltage to said input; so that base drive is provided for said transistor switch.
Claim 13
Dependent Claim
133 words
In combination comprising: input and output terminals; a common input-output terminal; an inductor having a primary winding; a transistor switch connected to said input terminal and through said primary winding to said output terminal and responsive to base drive; and means providing base drive to said transistor switch in response to a triggering pulse comprising; another transistor switch connected to said input terminal and the base of said one transistor switch and responsive to base drive, and a secondary winding on said inductor having one end directly connected to said input terminal and another end connected to said input terminal through a series arrangement of a unidirectional current conducting means and capacitor means, the interconnecting junction of said current conducting and capacitor means being connected to the emitter of said other transistor switch.
Claim 14
Dependent Claim
133 words
In combination comprising: input and output terminals; a common input-output terminal; an inductor having a primary winding; a transistor switch connected to said input terminal and through said primary winding to said output terminal and responsive to base drive; and means providing base drive to said transistor switch in response to a triggering pulse comprising; another transistor switch connected to said input terminal and the base of said one transistor switch and responsive to base drive, and a secondary winding on said inductor having one end directly connected to said input terminal and another end connected to said input terminal through a series arrangement of a unidirectional current conducting means and capacitor means, the interconnecting junction of said current conducting and capacitor means being connected to the emitter of said other transistor switch.
Claim 15
Dependent Claim
34 words
The combination set forth in claim 8 wherein said transistor switch comprises: an NPN-transistor having a collector connected to said input terminal, and an emitter connected through said primary winding to said output terminal.
Claim 16
Dependent Claim
35 words
The combination set forth in claim 8 wherein said other transistor switch comprises: a PNP-transistor having a collector connected to the base of said one transistor switch and an emitter connected to said input terminal.
Claim 17
Dependent Claim
22 words
The combination set forth in claim 10 wherein said emitter is connected to said input terminal by a unidirectional current conducting means.
Claim 18
Dependent Claim
31 words
The combination set forth in claim 11 wherein said unidirectional current conducting means comprises: a diode having a anode connected to said input terminal and a cathode connected to said emitter.
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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 |