EP0265322A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Switching power supply stand-by mode control circuit
Assignee: STMicroelectronics SA
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Filing: 1987-10-09
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Granted: —
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Expires: 2007-10-09
Abstract
Abstract The circuit is applicable to a supply with a transistor switching the prim. side of a transformer supplied with rectified mains voltage. The presence of a regulatory control signal is detected by a pulse-shaping circuit (74) and flip-flop (89) which inhibit a very low-frequency oscillator (82) from establishing a succession of periodic cycles. A high-frequency oscillator (64) produces square waves for a pulse duration modulator (78). A comparator (88) allows bursts of chopping signal during a first phase only of each VLF cycle whose duration lies between the periods of the HF and VLF oscillators.
Inventors
- 👤 Michel Van Den Driesche
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 02:48
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/63; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33507; H02M3/33523; H02M1/00; H02M1/0003; H02M1/0032; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
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References Cited (Backward Citations)
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