US3763399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage series resonant testing circuit arrangements
Assignee: Ferranti International PLC
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Filing: 1972-08-17
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Granted: 1973-10-02
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Expires: 1992-08-17
Abstract
Abstract A testing circuit arrangement repetitively stores voltages representative of the peak values of adjacent half cycles of an alternating testing signal and compares each newly stored peak value with a predetermined fraction of the stored immediately preceding peak value (of the opposite polarity). The voltage associated with the longer stored peak value is cleared after each comparison has been made and before the next peak value of that polarity occurs; and if a fall in successive peak values, by the predetermined fraction, has occurred at the time when the stored voltage is cleared, the test is halted.
Inventors
- 👤 R Jenkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:18
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/44; G; G01; G01R; G01R31/00; H02H3/50
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
A high voltage series resonant testing circuit arrangement comprising storage means responsive to an applied alternating signal for storing together two successive peak values of the alternating signal, comparator means for comparing the ratio of one stored peak value of a half cycle to that of the stored immediately-preceding half cycle with a predetermined fraction, clearing means adapted to clear the stored peak value of said immediately preceding half cycle after each comparison to enable the next following peak value to be stored, and output means operatively coupled to the comparator means to provide an output signal in response to the detection of such a ratio of peak values of less than the predetermined fraction.
Claim 2
Dependent Claim
115 words
A high voltage series resonant testing circuit arrangement comprising storage means responsive to an applied alternating signal for storing together two successive peak values of the alternating signal, comparator means for comparing the ratio of one stored peak value of a half cycle to that of the stored immediately-preceding half cycle with a predetermined fraction, clearing means adapted to clear the stored peak value of said immediately preceding half cycle after each comparison to enable the next following peak value to be stored, and output means operatively coupled to the comparator means to provide an output signal in response to the detection of such a ratio of peak values of less than the predetermined fraction.
Claim 3
Dependent Claim
58 words
A testing circuit arrangement as claimed in claim 1 in which the storage means includes two rectifiers, different rectifiers being arranged to conduct half cycles of the alternating signal of different polarity and, associated with each rectifier, a storage element for storing repetitively the peak values of the half cycles of the alternating signal conducted by the rectifier.
Claim 4
Dependent Claim
17 words
A testing circuit arrangement as claimed in claim 2 in which each storage element comprises a capacitor.
Claim 5
Dependent Claim
96 words
A testing circuit arrangement as claimed in claim 1 in which the clearing means includes two monostable multivibrators, different multivibrators being associated with half cycles of the alternating signal of different polarities, each multivibrator being arranged to be in an unstable state in response to the receipt by the testing circuit arrangement of a half cycle of the alternating signal of the associated polarity and to produce a signal upon the transference of the multivibrator at a time between three-quarters and a complete period of the input signal from said unstable state to a stable state.
Claim 6
Dependent Claim
88 words
A testing circuit arrangement as claimed in claim 4 in which the output means comprises two switching circuits, different switching circuits being associated with half cycles of the alternating signal of different polarities, each switching circuit being energised in response to receipt of signals both from the comparator means, and indicative of the detection of a ratio of stored peak values of less than the predetermined fraction, and from the associated multivibrator, and indicative of the transference of the multivibrator from said unstable state to a stable state.
Claim 7
Dependent Claim
93 words
A testing circuit arrangement as claimed in claim 1 in which the comparator means comprises two differential amplifiers, different differential amplifiers being associated with half cycles of the alternating signal of different polarities, each differential amplifier having two inputs with different inputs being arranged to receive from the storage means signals having a parameter magnitude representing the stored peak values of the half cycles of different polarities, and each differential amplifier being arranged to provide a signal in response to a ratio of the stored peak values of less than said predetermined fraction.
References Cited (Backward Citations)
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US3379934A
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US3510688A
Cited
US3519884A
Cited
US3525040A
Cited
US3593133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |