US3774073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low heat stroboscope circuit
Assignee: Individual
•
Filing: 1971-08-02
•
Granted: 1973-11-20
•
Expires: 1991-08-02
Abstract
Abstract A very simple circuit to eliminate unwanted heating and avoid power waste in A.C. powered stroboscopes by insuring that the flash-lamp does not fire while the A.C. supply can charge the lamp storage capacitor, by rearranging the same basic parts used in a conventional stroboscope. In one circuit the lamp is fired when the A.C. supply is at a negative or low positive voltage, while the capacitor charging diode allows current flow only during the positive A.C. cycle. In another circuit the lamp is fired when the A.C. supply is at a positive or low negative voltage, but the capacitor-charging diode allows current flow only during the negative A.C. half cycle.
Inventors
- 👤 H Switsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:34
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/34
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
151 words
A stroboscope circuit for firing and energizing a stroboscopic lamp from an A.C. source comprising: a power capacitor; means for connecting said power capacitor across said lamp to supply lamp energizing current to it; diode means for connecting said power capacitor to said A.C. source to allow charging of said power capacitor therefrom, said diode means connected to prevent current flow therethrough during the negative half cycle of the A.C. source; and timing means containing an impedance coupled to said A.C. source to sense the voltage of said A.C. source and supplying a firing pulse to fire the stroboscopic lamp during the portion of a cycle of said A.C. source when said A.C. source is below the ionization maintaining voltage of said lamp causing said diode to be reverse biased during the firing of said lamp, whereby to prevent the flow of current to the lamp directly from the A.C. source.
Claim 2
Dependent Claim
151 words
A stroboscope circuit for firing and energizing a stroboscopic lamp from an A.C. source comprising: a power capacitor; means for connecting said power capacitor across said lamp to supply lamp energizing current to it; diode means for connecting said power capacitor to said A.C. source to allow charging of said power capacitor therefrom, said diode means connected to prevent current flow therethrough during the negative half cycle of the A.C. source; and timing means containing an impedance coupled to said A.C. source to sense the voltage of said A.C. source and supplying a firing pulse to fire the stroboscopic lamp during the portion of a cycle of said A.C. source when said A.C. source is below the ionization maintaining voltage of said lamp causing said diode to be reverse biased during the firing of said lamp, whereby to prevent the flow of current to the lamp directly from the A.C. source.
Claim 3
Dependent Claim
16 words
The circuit described in claim 1 wherein: said timing means includes a two terminal switching means.
Claim 4
Dependent Claim
14 words
The circuit described in claim 1 wherein: said timing means includes a pulse transformer.
Claim 5
Dependent Claim
25 words
The circuit described in claim 1 wherein: said timing means includes a capacitor to serve as both the timing capacitor and the pulse energy capacitor.
Claim 6
Dependent Claim
157 words
A stroboscopic circuit for firing and energizing a stroboscopic lamp from an A.C. source comprising: a power capacitor; means for connecting said power capacitor across said lamp to supply lamp energizing current to it; diode means for connecting said power capacitor to said A.C. source to allow charging of said power capacitor therefrom, said diode means connected to prevent current flow therethrough during the positive half cycle of the A.C. source; and timing means containing an impedance coupled to said A.C. source to sense the voltage of said A.C. source and supplying a firing pulse to fire the stroboscopic lamp during the portion of a cycle of said A.C. source when said A.C. source is supplying a voltage of such polarity and magnitude as to cause current flow from said A.C. source to said lamp to be blocked by said diode means, whereby to prevent the flow of current to the lamp directly from the A.C. source.
Claim 7
Dependent Claim
157 words
A stroboscopic circuit for firing and energizing a stroboscopic lamp from an A.C. source comprising: a power capacitor; means for connecting said power capacitor across said lamp to supply lamp energizing current to it; diode means for connecting said power capacitor to said A.C. source to allow charging of said power capacitor therefrom, said diode means connected to prevent current flow therethrough during the positive half cycle of the A.C. source; and timing means containing an impedance coupled to said A.C. source to sense the voltage of said A.C. source and supplying a firing pulse to fire the stroboscopic lamp during the portion of a cycle of said A.C. source when said A.C. source is supplying a voltage of such polarity and magnitude as to cause current flow from said A.C. source to said lamp to be blocked by said diode means, whereby to prevent the flow of current to the lamp directly from the A.C. source.
Claim 8
Dependent Claim
16 words
The circuit described in claim 5 wherein: said timing means includes a two terminal switching means.
Claim 9
Dependent Claim
14 words
The circuit described in claim 5 wherein: said timing means includes a pulse transformer.
Claim 10
Dependent Claim
25 words
The circuit described in claim 5 wherein: said timing means includes a capacitor to serve as both the timing capacitor and the pulse energy capacitor.
References Cited (Backward Citations)
US3543087A
Cited
US3600996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |