US4401902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency switching circuit
Assignee: Toshiba Corp
•
Filing: 1982-02-16
•
Granted: 1983-08-30
•
Expires: 2002-02-16
Abstract
Abstract A switching element is connected between a power supply and the primary winding of a transformer, and it is on-off controlled with a predetermined cycle and with a predetermined conducting period. The secondary winding of the transformer is connected to a parallel circuit of a filtering capacitor and a load via a rectifier diode and a choke coil. A closed circuit, to which the reflux current of the choke coil flows through the parallel circuit of the filtering capacitor and load, is formed by a reflux diode.
Inventors
- 👤 Toshihiro Onodera
- 👤 Youichi Masuda
- 👤 Akira Nakajima
- 👤 Yoshio Takamura
- 👤 Seiji Kajiwara
- 👤 Shoichi Higo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:07
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33538
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
131 words
A single-ended high frequency switching circuit comprising: a single-ended switching circut including a transformer having a primary winding and a secondary winding, a switching element circuit connected between the primary winding of said transformer and a power supply and on-off operated with a predetermined cycle and a predetermined conduction period and a resonance capacitor connected in parallel with said primary winding; rectifying means connected to the secondary winding of said transformer; a filtering circuit including a filtering capacitor connected in parallel with a load; a choke coil connected between said filtering circuit and the output end of said rectifying means; and an unidirectional circuit element connected in parallel with said filtering circuit and said load via said choke coil and forming a closed circuit passing the current through said choke coil.
Claim 2
Dependent Claim
131 words
A single-ended high frequency switching circuit comprising: a single-ended switching circut including a transformer having a primary winding and a secondary winding, a switching element circuit connected between the primary winding of said transformer and a power supply and on-off operated with a predetermined cycle and a predetermined conduction period and a resonance capacitor connected in parallel with said primary winding; rectifying means connected to the secondary winding of said transformer; a filtering circuit including a filtering capacitor connected in parallel with a load; a choke coil connected between said filtering circuit and the output end of said rectifying means; and an unidirectional circuit element connected in parallel with said filtering circuit and said load via said choke coil and forming a closed circuit passing the current through said choke coil.
Claim 3
Dependent Claim
38 words
The single-ended high frequency switching circuit according to claim 1, wherein said switching element circuit includes a bipolar transistor and a diode connected between the collector and emitter of said bipolar transistor and in the opposite polarity thereto.
Claim 4
Dependent Claim
18 words
The single-ended high frequency switching circuit according to claim 1, wherein said unidirectional circuit element is a diode.
Claim 5
Dependent Claim
30 words
The single-ended high frequency switching circuit according to claim 1, 2 or 3, which further comprises an inductor connected between the secondary winding of said transformer and said rectifying 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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |