US4740880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blocking oscillator-switched power supply with peak current reduction circuitry
Assignee: Siemens AG
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Filing: 1986-10-17
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Granted: 1988-04-26
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Expires: 2006-10-17
Abstract
Abstract A circuit for reducing peak current in dependence on line voltage in a blocking oscillator-switched power supply, includes a transformer having a primary winding and a control winding, an electronic switch connected in series with the primary winding, and a control circuit supplied by the control winding for controlling the electronic switch, the control circuit including a pulse processing stage addressed by rectified a-c line voltage fed into the primary winding, a start-up stage, and a variable voltage coupling stage coupling the pulse-processing stage to the start-up stage.
Inventors
- 👤 Gunther Peruth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:35
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33507; H02M3/33523
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
87 words
Circuit for reducing peak current in dependence on line voltage in a blocking oscillator-switched power supply, comprising a transformer having a primary winding and a control winding, an electronic switch connected in series with said primary winding, and a control circuit supplied by said control winding for controlling said electronic switch, said control circuit including a pulse processing stage addressed by rectified a-c line voltage fed into said primary winding, a start-up stage, and a variable voltage coupling stage coupling said pulse-processing stage to said start-up stage.
Claim 2
Dependent Claim
87 words
Circuit for reducing peak current in dependence on line voltage in a blocking oscillator-switched power supply, comprising a transformer having a primary winding and a control winding, an electronic switch connected in series with said primary winding, and a control circuit supplied by said control winding for controlling said electronic switch, said control circuit including a pulse processing stage addressed by rectified a-c line voltage fed into said primary winding, a start-up stage, and a variable voltage coupling stage coupling said pulse-processing stage to said start-up stage.
Claim 3
Dependent Claim
22 words
Circuit according to claim 1, wherein said coupling stage is formed by a series circuit of a Zener diode and a resistor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |