US3742330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current mode d c to a c converters
Assignee: Delta Electronic Control Corp
•
Filing: 1971-09-07
•
Granted: 1973-06-26
•
Expires: 1991-09-07
Abstract
Abstract Circuitry for controlling a load current, without feedback, comprises: A. A SOURCE OF SUBSTANTIALLY CONSTANT CURRENT I1, b. power switching circuitry connected to receive I1 and to produce an output current a version of which is to be supplied to a load, and C. CONTROL MEANS CONNECTED TO CONTROL THE POWER SWITCHING CIRCUITRY SO AS TO CAUSE THE OUTPUT CURRENT TO SWITCH BETWEEN PREDETERMINED POSITIVE AND NEGATIVE VALUES, AND A VALUE INTERMEDIATE THERETO.
Inventors
- 👤 L Hodges
- 👤 L Suelzle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:39
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/538; H02M7/5381; H02M7/4826; H02M1/00; H02M1/0067; H02M1/007
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
218 words
In circuitry for controlling a load current, without feedback, the combination comprising: a. a source of substantially constant current I1, b. power switching circuitry connected to receive I1 and to produce an output current a version of which is to be supplied to a load, and c. control means connected to control the power switching circuitry so as to cause the output current to switch between predetermined positive and negative values, and a value intermediate thereto, d. said power switching circuitry including two parallel paths having I1 receiving inputs, each path including gate and diode means, the gate means having ON and OFF states controlled by said control means so that one path conducts output current I1 when the other path is non-conductive, and so that said other path conducts I1 output current when said one path is nonconductive, and there being a third path having an I1 receiving input and connected in parallel relation with said two parallel paths, said third path including gate and diode means, said last named gate means having ON and OFF states controlled by said control means so that said third path conducts I1 shunt current when the first and second paths are non-conductive, and so that the third path in non-conductive when either of the first and second paths is conductive.
Claim 2
Dependent Claim
218 words
In circuitry for controlling a load current, without feedback, the combination comprising: a. a source of substantially constant current I1, b. power switching circuitry connected to receive I1 and to produce an output current a version of which is to be supplied to a load, and c. control means connected to control the power switching circuitry so as to cause the output current to switch between predetermined positive and negative values, and a value intermediate thereto, d. said power switching circuitry including two parallel paths having I1 receiving inputs, each path including gate and diode means, the gate means having ON and OFF states controlled by said control means so that one path conducts output current I1 when the other path is non-conductive, and so that said other path conducts I1 output current when said one path is nonconductive, and there being a third path having an I1 receiving input and connected in parallel relation with said two parallel paths, said third path including gate and diode means, said last named gate means having ON and OFF states controlled by said control means so that said third path conducts I1 shunt current when the first and second paths are non-conductive, and so that the third path in non-conductive when either of the first and second paths is conductive.
Claim 3
Dependent Claim
27 words
The combination of claim 1 including a common terminal, and Wherein said first, second and third paths are connected between said I1 source and said common terminal.
Claim 4
Dependent Claim
54 words
The combination of claim 2 including an output transformer having a center tapped input winding to which said I1 source is connected, the first path connected between one end of said input winding and the common terminal, and the second path connected between the opposite end of the input winding and said common terminal.
Claim 5
Dependent Claim
15 words
The combination of claim 1 including said load connected to receive said output current version.
Claim 6
Dependent Claim
25 words
The combination of claim 3 wherein the output transformer has an output winding, and including said load to which said output winding is electrically connected.
Claim 7
Dependent Claim
16 words
The combination of claim 5 including a filter connected between said output winding and said load.
Claim 8
Dependent Claim
31 words
The combination of claim 5 wherein the output transformer has a third winding, and voltage application means connected across the third winding to limit the voltage produced across the output winding.
Claim 9
Dependent Claim
26 words
The combination of claim 1 wherein said gate means in said paths comprise transistors having bases effectively connected with said control means to be biased thereby.
Claim 10
Dependent Claim
42 words
The combination of claim 1 wherein said one path includes first and second sections, and said other path includes third and fourth sections, said second and third sections also connected in series, and said first and fourth sections also connected in series.
Claim 11
Dependent Claim
33 words
The combination of claim 9 including output current terminals one of which is connected between said second and third sections, and the other of which is connected between said first and fourth sections.
Claim 12
Dependent Claim
15 words
The combination of claim 10 wherein each of said sections includes gate and diode means.
Claim 13
Dependent Claim
58 words
Combination of claim 10 wherein said first, second, third, and fourth sections have alternative controlled states as follows: a. first and fourth conductive, and second and third non-conductive; b. second and third conductive, and first and fourth non-conductive; c. first and second conductive, and third and fourth non-conductive; d. third and fourth conductive; and first and second non-conductive.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |