US5225815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monitor for a polyphase rectifier which detects open diodes by sensing a signal below a predetermined threshold
Assignee: Thales Avionics SAS
•
Filing: 1991-07-10
•
Granted: 1993-07-06
•
Expires: 2011-07-10
Abstract
Abstract An electronic circuit senses that at least one circuit of rectifying diodes has been opened and response initiates an alarm. To sense one of the diode circuits being opened, the electronic circuit detects a temporary crossing of a low threshold by a DC voltage supplied at the rectifier output. The circuit is particularly applicable to high-power transformer-rectifiers aboard aircraft.
Inventors
- 👤 Benot Bocquet
- 👤 Joseph Hetyei
- 👤 Patrick Langlois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:31
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/10; H02H7/12; H02H7/125; H02H7/1255; G; G01; G01R; G01R31/00; G01R31/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
111 words
A monitor for a polyphase rectifier, comprising detection means for detecting the opening of at least one of the rectifying diodes included in the polyphase rectifier in order to control an alarm in the event of detection of such an opening, said detection means being arranged to sense that the DC voltage at the output of said polyphase rectifier has temporarily crossed a low threshold (LT), and control means for controlling the value of said low threshold (LT) as a function of the current magnitude at the output of said polyphase rectifier in such manner that the value of said low threshold (LT) decreases as the magnitude of said current increases.
Claim 2
Dependent Claim
111 words
A monitor for a polyphase rectifier, comprising detection means for detecting the opening of at least one of the rectifying diodes included in the polyphase rectifier in order to control an alarm in the event of detection of such an opening, said detection means being arranged to sense that the DC voltage at the output of said polyphase rectifier has temporarily crossed a low threshold (LT), and control means for controlling the value of said low threshold (LT) as a function of the current magnitude at the output of said polyphase rectifier in such manner that the value of said low threshold (LT) decreases as the magnitude of said current increases.
Claim 3
Dependent Claim
38 words
The monitor defined in claim 1, comprising a monostable circuit triggered as a function of said temporary crossing and of which the time-constant is larger than the period of the voltage to be rectified by said polyphase rectifier.
Claim 4
Dependent Claim
54 words
The monitor defined in claim 2, comprising means integrating the value of the output signal of said monostable circuit and means comparing the magnitude of the output signal of said integration means with a high threshold, which triggers said alarm when said high threshold is crossed by the output signal of said integration means.
References Cited (Backward Citations)
DE2460773A1
Cited
US3968418A
Cited
US4186391A
Cited
GB2029138A
Cited
US4380045A
Cited
US4713652A
Cited
EP0286951A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-05 | 1997-01-04 | 1997-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-05 | 2001-01-04 | 2001-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-05 | 2005-01-04 | 2005-07-06 | $7700.00 | Window Closed / Lapsed |