US6021059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated synchronous rectifier for power supplies
Assignee: Honeywell Inc
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Filing: 1998-12-31
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Granted: 2000-02-01
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Expires: 2018-12-31
Abstract
Abstract A timing circuit generates timing signals for a synchronous rectifier directly from the transformer power output winding. A phase detector detects the phase of the voltage on the output winding. A switched current source generates a digital timing signal responsive to the phase detector. The output from the current source is applied to the gate of the rectifier to control the on/off condition of the rectifier.
Inventors
- 👤 Dennis M. Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:08
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33569; H02M3/33576; H02M3/33592; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
An integrated synchronous rectifier circuit for use in rectifying a transformer isolated wave form, comprising: a phase detector circuit configured to derive phase information from the secondary winding; a current source configured to receive timing signals from said phase detector circuit; and a synchronous rectifier operatively associated with said current source and configured to be turned on when said phase detector circuit detects a forward conduction cycle and to be turned off when said phase detector circuit detects a reverse conduction cycle.
Claim 2
Dependent Claim
82 words
An integrated synchronous rectifier circuit for use in rectifying a transformer isolated wave form, comprising: a phase detector circuit configured to derive phase information from the secondary winding; a current source configured to receive timing signals from said phase detector circuit; and a synchronous rectifier operatively associated with said current source and configured to be turned on when said phase detector circuit detects a forward conduction cycle and to be turned off when said phase detector circuit detects a reverse conduction cycle.
Claim 3
Dependent Claim
30 words
The circuit of claim 1, further comprising a low power conductor disposed in parallel with said rectifier for effecting forward conduction at the leading edge of a forward conduction cycle.
Claim 4
Independent Claim
89 words
A method for controlling a synchronous rectifier in a power supply circuit, comprising the steps of: apply a variable duty cycle signal to a primary winding of a power converter transformer; inducing a transformer-isolated wave form in a secondary winding associated with said power transformer; detecting phase reversals in said secondary winding; utilizing said detected phase reversals to generate timing information to control the output of a current source; and applying said output of said current source to said rectifier to thereby control the on/off state of said rectifier.
Claim 5
Independent Claim
89 words
A method for controlling a synchronous rectifier in a power supply circuit, comprising the steps of: apply a variable duty cycle signal to a primary winding of a power converter transformer; inducing a transformer-isolated wave form in a secondary winding associated with said power transformer; detecting phase reversals in said secondary winding; utilizing said detected phase reversals to generate timing information to control the output of a current source; and applying said output of said current source to said rectifier to thereby control the on/off state of said rectifier.
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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) | 2003-01-31 | 2003-08-02 | 2004-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-01-31 | 2007-08-02 | 2008-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-01-31 | 2011-08-02 | 2012-02-01 | $7700.00 | Window Closed / Lapsed |