US4028612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamic current limiter for switching voltage regulators
Assignee: Bull HN Information Systems Italia SpA
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Filing: 1976-09-03
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Granted: 1977-06-07
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Expires: 1996-09-03
Abstract
Abstract A dynamic current limiting circuit to be used in connection with voltage regulators of the switching type is provided. The current limiter consists of electronic means suitably connected into the power stage of a conventional switching voltage regulator, for the purpose of reducing or removing the detrimental peak current spikes which occur whenever the power transistor switches from the non-conducting to the conducting state.
Inventors
- 👤 Luciano Orlando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:14
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
A dynamic current limiting circuit for a power supply, said power supply comprising a power switching transistor including a collector, a base and an emitter; a catch diode including an anode and a cathode; and an accumulator filter including capacitor and inductance means connected in parallel with said diode; said current limiting circuit comprising a feed-back transistor including collector, base and emitter elements; said collector element being connected to the base of said power switching transistor; said emitter element being connected to the cathode of said diode; said base element being connected to the emitter of said power switching transistor; and a feed-back inductance connected between said base and emitter elements of said feed-back transistor.
Claim 2
Dependent Claim
115 words
A dynamic current limiting circuit for a power supply, said power supply comprising a power switching transistor including a collector, a base and an emitter; a catch diode including an anode and a cathode; and an accumulator filter including capacitor and inductance means connected in parallel with said diode; said current limiting circuit comprising a feed-back transistor including collector, base and emitter elements; said collector element being connected to the base of said power switching transistor; said emitter element being connected to the cathode of said diode; said base element being connected to the emitter of said power switching transistor; and a feed-back inductance connected between said base and emitter elements of said feed-back transistor.
Claim 3
Dependent Claim
120 words
A regulating circuit for a power supply comprising a switching transistor having a collector coupled to one terminal of said power supply, the other terminal of said power supply being coupled to a reference point, means for applying current pulses to the base of said switching transistor, a feedback transistor having its base and emitter coupled respectively to the emitter and base of said switching transistor, an inductance coupled between the base and emitter of said feedback transistor, a commutating diode coupled across the terminals of said power supply, a filter coupled across said diode and including an inductance and a capacitor connected in series with each other, and means for deriving a regulated voltage across said last recited capacitor.
Claim 4
Dependent Claim
120 words
A regulating circuit for a power supply comprising a switching transistor having a collector coupled to one terminal of said power supply, the other terminal of said power supply being coupled to a reference point, means for applying current pulses to the base of said switching transistor, a feedback transistor having its base and emitter coupled respectively to the emitter and base of said switching transistor, an inductance coupled between the base and emitter of said feedback transistor, a commutating diode coupled across the terminals of said power supply, a filter coupled across said diode and including an inductance and a capacitor connected in series with each other, and means for deriving a regulated voltage across said last recited capacitor.
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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |