Patent US3886429A successfully refreshed from Google Patents.
US3886429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct-direct symmetrical converter power pack
Assignee: Thales SA
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Filing: 1974-01-17
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Granted: 1975-05-27
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Expires: 1994-01-17
Abstract
Abstract The converter comprises an autotransformer, four taps of which are respectively connected to one electrode of four transistors. When a direct voltage is applied to one or the other input of the converter, these transistors are alternately, by pairs, blocked and saturated, changing the direction of the current flowing in the winding of the autotransformer. The taps coupled to the four transistors are so chosen that the two inputs of the converter may be used with voltage supplies having two different values, the same converted voltage appearing between the output terminal in both cases. An automatic selector circuit, responsive to the value of the voltage applied to the input of the power pack, automatically connects this input to one or the other input of the converter.
Inventors
- 👤 Gilbert Maillard
- 👤 Jean Morisset
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:49
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3382; H02M3/3384
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
268 words
A direct-direct symmetrical convertEr power pack having an input for being coupled to a supply source having a voltage having either one of two predetermined different absolute values and an output and comprising: a converter formed by a transformer having two end terminals, said transformer comprising a winding with a centre tap and further taps; at least one rectifier circuit coupled to said two end terminals of said transformer and comprising an output forming the output of said power pack, a switching circuit comprising first and second terminals, first, second, third and fourth transistors, each having a control electrode and first and second further electrodes, four biasing circuits respectively coupled to said control electrodes of said first, second, third and fourth transistors, said first further electrodes of said first and second transistors being coupled to said first terminal, and said second further electrodes of said first and second transistors being symmetrically coupled to said winding relatively to said centre-tap, said first further electrodes of said third and fourth transistors being coupled to said second terminal and said second further electrodes of said third and fourth transistor being symmetrically coupled to said winding relatively to said centre-tap, said first terminal and said centre-tap forming a first input of said converter, said first and second terminals forming a second input of said converter; and a selector device for connecting said input of said power pack either to said first input or to said second input of said converter depending upon the value of said voltage for maintaining at a constant value the voltage at said output of said power pack.
Claim 2
Dependent Claim
268 words
A direct-direct symmetrical convertEr power pack having an input for being coupled to a supply source having a voltage having either one of two predetermined different absolute values and an output and comprising: a converter formed by a transformer having two end terminals, said transformer comprising a winding with a centre tap and further taps; at least one rectifier circuit coupled to said two end terminals of said transformer and comprising an output forming the output of said power pack, a switching circuit comprising first and second terminals, first, second, third and fourth transistors, each having a control electrode and first and second further electrodes, four biasing circuits respectively coupled to said control electrodes of said first, second, third and fourth transistors, said first further electrodes of said first and second transistors being coupled to said first terminal, and said second further electrodes of said first and second transistors being symmetrically coupled to said winding relatively to said centre-tap, said first further electrodes of said third and fourth transistors being coupled to said second terminal and said second further electrodes of said third and fourth transistor being symmetrically coupled to said winding relatively to said centre-tap, said first terminal and said centre-tap forming a first input of said converter, said first and second terminals forming a second input of said converter; and a selector device for connecting said input of said power pack either to said first input or to said second input of said converter depending upon the value of said voltage for maintaining at a constant value the voltage at said output of said power pack.
Claim 3
Dependent Claim
44 words
A power pack as claimed in claim 1, wherein one of said two predetermined absolute values of said voltage being half the other one, said second further electrodes of said first and third transistors are connected to a single one of said further taps.
Claim 4
Dependent Claim
65 words
A power pack as claimed in claim 1, wherein said first and second transistors are of one and the same type and said third and fourth transistors are of the type complementary to said one type, and wherein said first further electrode, said second further electrode and said control electrode of each of said transistors are respectively the collector, the emitter and the base thereof.
Claim 5
Dependent Claim
40 words
A power pack as claimed in claim 3, wherein each of said four biasing circuits comprises a parallel arrangement of a resistor and a capacitor, each arrangement being connected between the base of one of said transistors and said winding.
Claim 6
Dependent Claim
65 words
A power pack as claimed in claim 1, wherein said selector device is an automatic selector circuit comprising: a first switch between said input of said power pack and said first terminal; a second switch between said input of said power pack and said second terminal; and means coupled to said power pack input, and responsive to the voltage applied thereto, for controlling said switches.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |