US3582826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor blocking oscillator for triggering an intermittently energizable load
Assignee: STMicroelectronics SRL
•
Filing: 1969-04-07
•
Granted: 1971-06-01
•
Expires: 1989-04-07
Abstract
Abstract A DC to DC converter, forming part of a trigger system for a photoflash lamp powered by a small battery, comprises a blocking oscillator with two transistors connected in cascade and with a regenerative circuit leading via a feedback transformer by way of respective capacitors to the bases of the two transistors in parallel, the emitter-collector path of one transistor lying in series with the base-emitter path of the other transistor.
Inventors
- 👤 Giorgio Del Zotto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:27
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3381; H05; H05B; H05B41/00; H05B41/14; H05B41/26; H05B41/28; H05B41/282; H05B41/30; H05B41/32; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
A circuit arrangement for triggering an intermittently energizable load, comprising a first transistor with a first base, a first emitter and a first collector; a second transistor with a second base, a second emitter and a second collector, said second emitter and collector being connected in series with said first base and emitter; a source of DC driving voltage; a feedback transformer with a primary winding connected in series with said source between said first emitter and said first and second collectors; an inductance in series with said source between said first and second collectors; an input circuit including a secondary winding of said transformer regeneratively connected between said first emitter and said first and second bases for intermittently driving said first transistor to saturation; and a load circuit including a further winding of said transformer.
Claim 2
Dependent Claim
136 words
A circuit arrangement for triggering an intermittently energizable load, comprising a first transistor with a first base, a first emitter and a first collector; a second transistor with a second base, a second emitter and a second collector, said second emitter and collector being connected in series with said first base and emitter; a source of DC driving voltage; a feedback transformer with a primary winding connected in series with said source between said first emitter and said first and second collectors; an inductance in series with said source between said first and second collectors; an input circuit including a secondary winding of said transformer regeneratively connected between said first emitter and said first and second bases for intermittently driving said first transistor to saturation; and a load circuit including a further winding of said transformer.
Claim 3
Dependent Claim
35 words
A circuit arrangement as defined in claim 1 wherein said input circuit has a first and a second branch respectively terminating at said first and second bases, each of said branches including a series capacitance.
Claim 4
Dependent Claim
43 words
A circuit arrangement as defined in claim 1 wherein said load circuit comprises an output condenser connected in a charging circuit across said further winding, and a diode in said charging circuit for preventing a discharge of said condenser through said further winding.
Claim 5
Dependent Claim
31 words
A circuit arrangement as defined in claim 3 wherein said diode is poled to enable the charging of said condenser only upon a diminution of current flow through said primary winding.
Claim 6
Dependent Claim
149 words
A circuit arrangement for triggering an intermittently energizable load, comprising a first transistor with a first base, a first emitter and a first collector; a second transistor with a second base, a second emitter and a second collector, said second emitter and collector being connected in series with said first base and emitter; a source of DC driving voltage; a feedback transformer with a primary winding connected in series with said source between said first emitter and said first and second collectors; an input circuit including a secondary winding of said transformer regeneratively connected between said first emitter and said first and second bases for intermittently driving said first transistor to saturation, said input circuit having a first and a second branch respectively terminating at said first and second bases, each of said branches including a series capacitance; and a load circuit including a further winding of said transformer.
Claim 7
Dependent Claim
149 words
A circuit arrangement for triggering an intermittently energizable load, comprising a first transistor with a first base, a first emitter and a first collector; a second transistor with a second base, a second emitter and a second collector, said second emitter and collector being connected in series with said first base and emitter; a source of DC driving voltage; a feedback transformer with a primary winding connected in series with said source between said first emitter and said first and second collectors; an input circuit including a secondary winding of said transformer regeneratively connected between said first emitter and said first and second bases for intermittently driving said first transistor to saturation, said input circuit having a first and a second branch respectively terminating at said first and second bases, each of said branches including a series capacitance; and a load circuit including a further winding of said transformer.
Claim 8
Dependent Claim
37 words
A circuit arrangement as defined in claim 5 wherein said first branch further comprises a first resistor in series with the capacitance thereof and said second branch comprises a second resistor in shunt with the capacitance thereof.
Claim 9
Dependent Claim
30 words
A circuit arrangement as defined in claim 6 wherein said first resistor is inserted in said first branch ahead of a junction of said first base with said second emitter.
Claim 10
Dependent Claim
22 words
A circuit arrangement as defined in claim 6, further comprising a third resistor connected between said second base and said second collector.
References Cited (Backward Citations)
US3161836A
Cited
US3435320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |