US3562628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for limiting the firing of a silicon controlled rectifier to a low angle of the input alternating current
Assignee: Individual
•
Filing: 1968-06-10
•
Granted: 1971-02-09
•
Expires: 1988-06-10
Abstract
Abstract In a system normally providing random firing signals to a pair of silicon controlled rectifiers, one for each phase of an alternating current source of power, in phase inhibiting pulses are applied to reduce the firing angle to a predetermined maximum.
Inventors
- 👤 Alfred W Barber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:54
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/45; G05F1/452; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/20; G05D23/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A low frequency power control device including in combination a power transformer including a primary for receiving power from a low frequency power source and a secondary, utilization means connected to said secondary, signal controlled semiconductor means connected in series with said primary for conductively controlling the power to said primary, a transistor oscillator coupled to control said semiconductor means, and means for initiating oscillation in said transistor oscillator in accordance with a requirement for power in said utilization means; and the improvement which includes low frequency responsive means coupled between said primary and said transistor oscillator for inhibiting said oscillator over the portion of each half cycle of primary power voltage lying above zero and a predetermined low angle of said half cycle.
Claim 2
Dependent Claim
124 words
A low frequency power control device including in combination a power transformer including a primary for receiving power from a low frequency power source and a secondary, utilization means connected to said secondary, signal controlled semiconductor means connected in series with said primary for conductively controlling the power to said primary, a transistor oscillator coupled to control said semiconductor means, and means for initiating oscillation in said transistor oscillator in accordance with a requirement for power in said utilization means; and the improvement which includes low frequency responsive means coupled between said primary and said transistor oscillator for inhibiting said oscillator over the portion of each half cycle of primary power voltage lying above zero and a predetermined low angle of said half cycle.
Claim 3
Dependent Claim
41 words
A low frequency power control device as set forth in claim 1 wherein the last said means includes full wave rectifying means for providing an inhibiting signal in response to each half cycle of low frequency input power to said primary.
Claim 4
Dependent Claim
22 words
A low frequency power control device as set forth in claim 1 wherein the last said means includes adjustable series impedance means.
Claim 5
Dependent Claim
108 words
In a low frequency alternating current power control device, the combination of means for receiving low frequency alternating current power; load means to be supplied with alternating current power; silicon controlled rectifier means coupled between said receiving means and said load means for controlling power flow to said load means; asynchronous transistor oscillator means for firing said silicon controlled rectifier means; and inhibiting means coupled between said transistor oscillator and said receiving means for preventing the firing of said silicon controlled rectifier means in the presence of power voltage at said receiving means lying above zero and a predetermined low angle of each half cycle of said power.
Claim 6
Dependent Claim
108 words
In a low frequency alternating current power control device, the combination of means for receiving low frequency alternating current power; load means to be supplied with alternating current power; silicon controlled rectifier means coupled between said receiving means and said load means for controlling power flow to said load means; asynchronous transistor oscillator means for firing said silicon controlled rectifier means; and inhibiting means coupled between said transistor oscillator and said receiving means for preventing the firing of said silicon controlled rectifier means in the presence of power voltage at said receiving means lying above zero and a predetermined low angle of each half cycle of said power.
Claim 7
Dependent Claim
33 words
A low frequency alternating current power control device as set forth in claim 4 where said inhibiting means includes full wave rectifier means coupled to said receiving means and to said oscillator means.
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |