US3448368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency independent phase control circuit
Assignee: US Philips Corp
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Filing: 1966-11-02
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Granted: 1969-06-03
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Expires: 1986-11-02
Abstract
Abstract A self-oscillating inverter uses a pair of SCR's to supply energy to a variable load that produces frequency variations in the inverter. An alternating control voltage is derived from the inverter and supplied to a gate control circuit that includes a voltage divider and a capacitor having one electrode connected to first and second taps on the voltage divider via a pair of oppositely poled diodes. The other capacitor electrode is coupled to a point of fixed voltage and to the gate electrodes of the SCR's to maintain the firing angle thereof constant despite said frequency variations in the inverter.
Inventors
- 👤 Cornelis Johannes Brouwer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:20
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/516; H02M1/00; H02M1/08; H02M1/081; H02M7/53; H02M7/537; H02M7/5383; H02M7/53846; H02M7/53854; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/73
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3010062A
Cited
US3325716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |