US3723756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High efficiency current feedback control system
Assignee: Raytheon Co
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Filing: 1972-02-09
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Granted: 1973-03-27
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Expires: 1992-02-09
Abstract
Abstract A high efficiency power switching system for charging loads by repetitively switching a power source to a load with the system reliably operating over relatively large load current variations. The switching system utilizes a proportion of the main switching transistor collector current to provide an efficient and rapidly responsive control of the base current to that transistor. The collector current is initially stepped down through a first transformer to a lower level to decrease the saturation loss of the switching transistor and of the controlling devices and is then stepped back up through a second transformer to the level required for efficient base drive up the main transistor. The controlling devices are periodically turned on and off and during the storage time of the main transistor a current proportional to the collector current is removed from the base of that transistor to reduce its storage time and decrease its turn off time. The system features provide an efficiently controlled main transistor and a highly efficient charging system.
Inventors
- 👤 R Dahlinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:25
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/53; H03K3/57; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33507; H02M3/33523; H02M3/337; H02M3/3376; H02M3/3378; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/601; H03K3/26; H03K3/30; H03K2217/00; H03K2217/0036
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
Apparatus for charging a load through a diode in a secondary winding of a first transformer comprising a source of power, a switching transistor having a collector, emitter and base with the collector coupled to a first end of a primary winding of said first transformer and the emitter coupled to said source of power, a current feedback transformer having a primary winding with one end coupled to the primary winding of the first transformer and the other end coupled to said source of power, a drive transformer having first and second primary windings with a first end of each coupled to a secondary winding of said current feedback transformer and having a secondary winding coupled to the base and the emitter of said switching transistor, and on-off switching means coupled to second ends of the primary windings of said drive transformer.
Claim 2
Dependent Claim
142 words
Apparatus for charging a load through a diode in a secondary winding of a first transformer comprising a source of power, a switching transistor having a collector, emitter and base with the collector coupled to a first end of a primary winding of said first transformer and the emitter coupled to said source of power, a current feedback transformer having a primary winding with one end coupled to the primary winding of the first transformer and the other end coupled to said source of power, a drive transformer having first and second primary windings with a first end of each coupled to a secondary winding of said current feedback transformer and having a secondary winding coupled to the base and the emitter of said switching transistor, and on-off switching means coupled to second ends of the primary windings of said drive transformer.
Claim 3
Dependent Claim
25 words
The combination of claim 1 further including a current source coupled to the first ends of said first and second windings of said drive transformer.
Claim 4
Dependent Claim
40 words
The combination of claim 2 in which said switching transistor is an n-p-n type transistor and said on-off switching means includes first and second n-p-n type transistors coupled to the second ends of the primary windings of said drive transformer.
Claim 5
Dependent Claim
190 words
A circuit for charging a load comprising a source of power, a switching transistor having first and second load terminals and a control terminal with the first load terminal coupled to said source of power, a load transformer coupled to said load and having a primary winding with one end coupled to the second load terminal of said switching transistor, a current feedback transformer having a primary winding and a secondary winding with the primary winding coupled between the source of power and a second end of the primary winding of said load transformer, a drive transformer having first and second primary windings and a secondary winding with first ends of said primary windings coupled to a first end of the secondary winding of said current feedback transformer, said secondary winding of said drive transformer being coupled between the control terminal and the first load terminal of said switching transistor, a source of reference potential coupled to a second end of the secondary winding of said current feedback transformer, and switching means coupled between second ends of said primary windings of said drive transformer and said source of reference potential.
Claim 6
Dependent Claim
190 words
A circuit for charging a load comprising a source of power, a switching transistor having first and second load terminals and a control terminal with the first load terminal coupled to said source of power, a load transformer coupled to said load and having a primary winding with one end coupled to the second load terminal of said switching transistor, a current feedback transformer having a primary winding and a secondary winding with the primary winding coupled between the source of power and a second end of the primary winding of said load transformer, a drive transformer having first and second primary windings and a secondary winding with first ends of said primary windings coupled to a first end of the secondary winding of said current feedback transformer, said secondary winding of said drive transformer being coupled between the control terminal and the first load terminal of said switching transistor, a source of reference potential coupled to a second end of the secondary winding of said current feedback transformer, and switching means coupled between second ends of said primary windings of said drive transformer and said source of reference potential.
Claim 7
Dependent Claim
32 words
The combination of claim 4 in which a diode is coupled between the secondary winding of said current feedback transformer and the first ends of the primary windings of said drive transformer.
Claim 8
Dependent Claim
24 words
The combination of claim 5 in which a current source is coupled to the first ends of the primary windings of said drive transformer.
Claim 9
Dependent Claim
16 words
The combination of claim 6 in which said current source includes a resistor and a diode.
Claim 10
Dependent Claim
72 words
The combination of claim 4 in which said switching means includes first and second transistors having load current paths and control terminals with their load current paths coupled between the second ends of the primary windings of said drive transformer and said source of reference potential and includes control means coupled to the control terminals of said first and second transistors to alternately bias one into conduction and one out of conduction.
Claim 11
Dependent Claim
14 words
The combination of claim 8 in which said switching transistor is an n-p-n type.
Claim 12
Dependent Claim
45 words
The combination of claim 9 in which the load is a pulse forming network and in which a rectifier is coupled between a secondary winding of said load transformer and said pulse forming network so as to be reverse-biased when said switching transistor is conducting.
References Cited (Backward Citations)
US3668435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |