US5265003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Miniaturized switching power supply with programmed level gate drive
Assignee: Comdisco Inc
•
Filing: 1990-07-25
•
Granted: 1993-11-23
•
Expires: 2010-07-25
Abstract
Abstract A miniaturized switching power supply has an output circuit for supplying gate drive to a power FET. The output circuit incorporates a pair of series connected transistors with a zener diode connected to the base of one of the transistors to limit the gate drive to the FET.
Inventors
- 👤 Kenneth W. Kayser
- 👤 Joel C. Van Antwerp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:10
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M1/00; H02M1/08; H03; H03K; H03K17/00; H03K17/08; H03K17/081; H03K17/0812; H03K17/08122; H03K17/16; H03K17/161; H03K17/162; H03K17/163; H03K17/51; H03K17/56; H03K17/687; H03K17/6877
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
162 words
A programmable gate drive for a switching power supply incorporating first and second transistors connected in series between a positive voltage source and a reference voltage, said first and second transistors comprising a PNP and NPN transistor respectively, means for connecting a point intermediate said first and second transistors to a gate of a power FET, said power FET serving to regulate the voltage supplied at an output of the switching power supply, means for driving the bases of each of said first and second transistors with signals so as to turn on and turn off said power FET at predetermined times during plural cycles of operation, and zener diode means for limiting the voltage level at the base of one of said first and second transistors, to limit the drive supplied to the power FET to a predetermined level, and said zener diode being connected between a source of potential and the base of one of said first and second transistors.
Claim 2
Dependent Claim
162 words
A programmable gate drive for a switching power supply incorporating first and second transistors connected in series between a positive voltage source and a reference voltage, said first and second transistors comprising a PNP and NPN transistor respectively, means for connecting a point intermediate said first and second transistors to a gate of a power FET, said power FET serving to regulate the voltage supplied at an output of the switching power supply, means for driving the bases of each of said first and second transistors with signals so as to turn on and turn off said power FET at predetermined times during plural cycles of operation, and zener diode means for limiting the voltage level at the base of one of said first and second transistors, to limit the drive supplied to the power FET to a predetermined level, and said zener diode being connected between a source of potential and the base of one of said first and second transistors.
Claim 3
Dependent Claim
159 words
A programmable gate drive for a switching power supply incorporating first and second transistors connected in series between a positive voltage source and a reference voltage, means for connecting a point intermediate said first and second transistors to a gate of a power FET, said power FET serving to regulate the voltage supplied at an output of the switching power supply, means for driving the bases of each of said first and second transistors with signals so as to turn on and turn off said power FET at predetermined times during plural cycles of operation, and means for limiting the voltage level at the base of one of said first and second transistors to limit the drive supplied to the power FET to a predetermined level; said first and second transistors comprising NPN and PNP transistors, respectively, and said limiting means comprising a zener diode interconnected between the collector of said NPN transistor and the base of PNP transistor.
Claim 4
Dependent Claim
159 words
A programmable gate drive for a switching power supply incorporating first and second transistors connected in series between a positive voltage source and a reference voltage, means for connecting a point intermediate said first and second transistors to a gate of a power FET, said power FET serving to regulate the voltage supplied at an output of the switching power supply, means for driving the bases of each of said first and second transistors with signals so as to turn on and turn off said power FET at predetermined times during plural cycles of operation, and means for limiting the voltage level at the base of one of said first and second transistors to limit the drive supplied to the power FET to a predetermined level; said first and second transistors comprising NPN and PNP transistors, respectively, and said limiting means comprising a zener diode interconnected between the collector of said NPN transistor and the base of PNP transistor.
Claim 5
Dependent Claim
171 words
A programmable gate drive for a switching power supply incorporating first and second transistors connected in series between a positive voltage source and a reference voltage, means for connecting a point intermediate said first and second transistors to a gate of a power FET, said power FET serving to regulate the voltage supplied at an output of the switching power supply, means for driving the bases of each of said first and second transistors with signals so as to turn on and turn off said power FET at predetermined times during plural cycles of operation, and means for limiting the voltage level at the base of one of said first and second transistors to limit the drive supplied to the power FET to a predetermined level; said first and second transistors comprising a PNP and NPN transistor, respectively, and said limiting means comprising a zener diode having a zener voltage of about 12 volts connected between a source of potential and the base of one of said first and second transistors.
Claim 6
Dependent Claim
171 words
A programmable gate drive for a switching power supply incorporating first and second transistors connected in series between a positive voltage source and a reference voltage, means for connecting a point intermediate said first and second transistors to a gate of a power FET, said power FET serving to regulate the voltage supplied at an output of the switching power supply, means for driving the bases of each of said first and second transistors with signals so as to turn on and turn off said power FET at predetermined times during plural cycles of operation, and means for limiting the voltage level at the base of one of said first and second transistors to limit the drive supplied to the power FET to a predetermined level; said first and second transistors comprising a PNP and NPN transistor, respectively, and said limiting means comprising a zener diode having a zener voltage of about 12 volts connected between a source of potential and the base of one of said first and second transistors.
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) | 1996-11-22 | 1997-05-24 | 1997-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-22 | 2001-05-24 | 2001-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-22 | 2005-05-24 | 2005-11-23 | $7700.00 | Window Closed / Lapsed |