US3909747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blocking oscillator with energy recovery
Assignee: Danfoss AS
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Filing: 1974-08-26
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Granted: 1975-09-30
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Expires: 1994-08-26
Abstract
Abstract A blocking oscillator including a transistor amplifier with a feedback transformer having a main winding in the collector circuit and a feedback winding in the base circuit. The feedback winding also serves as an energy-recovery winding by having a diode connected in series with it. The diode is poled such that, when the amplifier is not conducting, the magnetic energy stored in the transformer is fed back to the power supply.
Inventors
- 👤 Hans Mogens Beierholm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:02
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3381; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
191 words
A blocking oscillator comprising a direct current supply having first and second terminals, an amplifier constituting a junction transistor having an emitter, collector and base, a feedback transformer connected to said amplifier and having a main winding and an energy-recovery winding, and a diode connected in series with said energy recovery winding in a path in parallel with the first and second terminals of said source, the diode being poled such that when said amplifier is not conducting the magnetic energy stored in said transformer is fed back to the terminals of said source as a current in said path, said energy-recovery winding being a feedback winding connected to said amplifier, a resistor, said collector being connected through said main winding to the first terminal of said supply, said emitter being connected to the second terminal of saiD supply, and the ends of said feedback winding being respectively connected to the first terminal of said supply and through said resistor to said base, said diode being connected to the junction of said resistor and said feedback winding, and being poled in the reverse sense to the base-emitter junction of said transistor.
Claim 2
Dependent Claim
191 words
A blocking oscillator comprising a direct current supply having first and second terminals, an amplifier constituting a junction transistor having an emitter, collector and base, a feedback transformer connected to said amplifier and having a main winding and an energy-recovery winding, and a diode connected in series with said energy recovery winding in a path in parallel with the first and second terminals of said source, the diode being poled such that when said amplifier is not conducting the magnetic energy stored in said transformer is fed back to the terminals of said source as a current in said path, said energy-recovery winding being a feedback winding connected to said amplifier, a resistor, said collector being connected through said main winding to the first terminal of said supply, said emitter being connected to the second terminal of saiD supply, and the ends of said feedback winding being respectively connected to the first terminal of said supply and through said resistor to said base, said diode being connected to the junction of said resistor and said feedback winding, and being poled in the reverse sense to the base-emitter junction of said transistor.
Claim 3
Dependent Claim
17 words
A blocking oscillator according to claim 1 further comprising a capacitor connected in parallel with said resistor.
Claim 4
Dependent Claim
132 words
A blocking oscillator comprising a direct current supply having first and second terminals; a transistor amplifier; a diode; and a feedback transformer having a main winding, an output winding and a feedback winding; said main winding being connected in series with said amplifier between said first and second terminals; said output winding being connected to a load; and said feedback winding forming an energy-recovery winding by being connected directly between said first terminal and said diode, said diode being connected directly between said feedback winding and said second terminal, the junction of said diode and said feedback winding being connected to said amplifier, and said diode being poled such that when said amplifier is not conducting the magnetic energy stored in said transformer is fed back to said first and second terminals.
Claim 5
Dependent Claim
132 words
A blocking oscillator comprising a direct current supply having first and second terminals; a transistor amplifier; a diode; and a feedback transformer having a main winding, an output winding and a feedback winding; said main winding being connected in series with said amplifier between said first and second terminals; said output winding being connected to a load; and said feedback winding forming an energy-recovery winding by being connected directly between said first terminal and said diode, said diode being connected directly between said feedback winding and said second terminal, the junction of said diode and said feedback winding being connected to said amplifier, and said diode being poled such that when said amplifier is not conducting the magnetic energy stored in said transformer is fed back to said first and second terminals.
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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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |