US3914689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self powering temperature compensated rectifier for measuring current
Assignee: Individual
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Filing: 1974-05-06
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Granted: 1975-10-21
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Expires: 1994-05-06
Abstract
Abstract The current measuring device provides for measuring the power in radio frequency waves without requiring any source of power for the measuring device except the radio waves themselves, and the device includes a rectifier to change alternating current to direct current by a solid state diode, but a solid state diode has an offset voltage of approximately 0.4 volt and to provide compensation for this offset a second diode is used in opposed relation to the first diode and the second diode is powered from the source of alternating current by a third diode so the resulting voltage from the device is linear and the extrapolation of the linearity passes through the origin of the graph thereby providing for measuring currents with extreme accuracy over a large temperature range without requiring an additional source of power and without requiring thermisters or bolometers. The output of the circuit can be directly applied to an analog/digital converter (A/D converter) to obtain a digital reading of the analog of the circuit.
Inventors
- 👤 Charles S Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:27
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/22; G01R21/00; G01R21/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
314 words
A self-powering temperature compensated rectifier for measuring alternating currents comprising a first lead for connection to one terminal of a source of alternating current, a first solid state diode having one terminal connected to said first lead for connection to one terminal of a source of alternating current, a metering means, a first output lead connected between the other terminal of said first solid state diode and one terminal of sAid metering means, a second lead for connection to the other terminal of said source of alternating current, a second solid state diode opposed to said first diode and having one terminal of said second diode connected to said other lead from said source of alternating current, a second output lead connected between the other terminal of said second diode and the other terminal of said metering means, a first capacitor connected between said first output lead and said second output lead, a resistor having one terminal connected to said second lead for connection to the other terminal of said source of alternating current, a junction having one terminal connected to the other terminal of said resistor, a second capacitor connected between said first lead from said source of alternating current and said junction, a third solid state diode having one terminal connected to said second output lead, the other terminal of said third diode being connected to said junction, a third capacitor connected between said second lead for connection to the other terminal of said source of alternating current and and said second output lead whereby said third diode provides current to said second diode with all of the power for said self powering temperature compensated rectifier being supplied solely by the said source of alternating current being measured, the said one terminals of each diode being of the same polarity and the other terminals of each diode being of the opposite polarity.
Claim 2
Dependent Claim
314 words
A self-powering temperature compensated rectifier for measuring alternating currents comprising a first lead for connection to one terminal of a source of alternating current, a first solid state diode having one terminal connected to said first lead for connection to one terminal of a source of alternating current, a metering means, a first output lead connected between the other terminal of said first solid state diode and one terminal of sAid metering means, a second lead for connection to the other terminal of said source of alternating current, a second solid state diode opposed to said first diode and having one terminal of said second diode connected to said other lead from said source of alternating current, a second output lead connected between the other terminal of said second diode and the other terminal of said metering means, a first capacitor connected between said first output lead and said second output lead, a resistor having one terminal connected to said second lead for connection to the other terminal of said source of alternating current, a junction having one terminal connected to the other terminal of said resistor, a second capacitor connected between said first lead from said source of alternating current and said junction, a third solid state diode having one terminal connected to said second output lead, the other terminal of said third diode being connected to said junction, a third capacitor connected between said second lead for connection to the other terminal of said source of alternating current and and said second output lead whereby said third diode provides current to said second diode with all of the power for said self powering temperature compensated rectifier being supplied solely by the said source of alternating current being measured, the said one terminals of each diode being of the same polarity and the other terminals of each diode being of the opposite polarity.
Claim 3
Dependent Claim
21 words
The invention according to claim 1 in which another resistor is provided between said first output lead and said metering means.
Claim 4
Dependent Claim
13 words
The invention according to claim 1 in which metering means is A/D convertor.
Claim 5
Dependent Claim
23 words
The invention according to claim 1 in which the leads for connection to the source of alternating current are connected to a transformer.
Claim 6
Dependent Claim
14 words
The invention according to claim 4 in which the transformer is a toroidal transformer.
Claim 7
Dependent Claim
16 words
The invention according to claim 1 in which the metering means is a direct current meter.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |