US4801874A
Expired / Lapsed
US
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Method and apparatus for measuring electricity
Assignee: Landis and Gyr LLC
•
Filing: 1987-02-27
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Granted: 1989-01-31
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Expires: 2007-02-27
Abstract
Abstract In a method and apparatus for the electronic measurement of the electricity used by a load, a rectified voltage signal proportional to the load voltage is generated, and a frequency modulated pulse train is generated in response to this rectified voltage signal, with the frequency of the pulses being proportional to the instantaneous amplitude of the rectified voltage. A load current signal is generated that is proportional to the load current and is gated during each pulse of the frequency modulated pulse train to generate a signal representing the product of the instantaneous load voltage and the instantaneous load current. This signal may be integrated over time to generate a signal representing the amount of electric energy used by the load.
Inventors
- 👤 Horst R. Loeffler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:48
CPC Classifications
G; G01; G01R; G01R11/00; G01R11/30; G01R21/00; G01R21/127; G01R21/1271; G01R21/133; G01R21/1331
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
167 words
Apparatus for electronically measuring the electricity used by a load comprising: (a) means for generating an analog load voltage signal proportional to the instantaneous load voltage, said means being responsive to any positive and negative portions of the load voltage; (b) means for generating a frequency modulated pulse train of signals in response to the load voltage signal, the instantaneous frequency of the pulses being proportional to the instantaneous amplitude of the load voltage signal; (c) means for generating an analog load current signal proportional to the instantaneous load current, said means being responsive to any positive and negative portions of the load current; and (d) logic means for gating the instantaneous load current signal during each pulse of the frequency modulated pulse train, said logic means generating an output signal comprising a train of pulses having a frequency proportional to the instantaneous load voltage and an amplitude proportional to the instantaneous load current, representing the product of the instantaneous load voltage and the instantaneous load current.
Claim 2
Dependent Claim
167 words
Apparatus for electronically measuring the electricity used by a load comprising: (a) means for generating an analog load voltage signal proportional to the instantaneous load voltage, said means being responsive to any positive and negative portions of the load voltage; (b) means for generating a frequency modulated pulse train of signals in response to the load voltage signal, the instantaneous frequency of the pulses being proportional to the instantaneous amplitude of the load voltage signal; (c) means for generating an analog load current signal proportional to the instantaneous load current, said means being responsive to any positive and negative portions of the load current; and (d) logic means for gating the instantaneous load current signal during each pulse of the frequency modulated pulse train, said logic means generating an output signal comprising a train of pulses having a frequency proportional to the instantaneous load voltage and an amplitude proportional to the instantaneous load current, representing the product of the instantaneous load voltage and the instantaneous load current.
Claim 3
Dependent Claim
38 words
The apparatus of claim 1 wherein the means for generating a frequency modulated pulse train of signals comprises means for generating a train of uniform pulses, each pulse being substantially the same duration and substantially the same amplitude.
Claim 4
Dependent Claim
26 words
The apparatus of claim 1 wherein the means for generating a frequency modulated pulse train of signals comprises means for generating a train of unidirectional pulses.
Claim 5
Dependent Claim
62 words
The apparatus of claim 1 wherein the means for generating an analog load voltage signal comprises means for generating a rectified load voltage signal proportional to the instantaneous load voltage in response to an input voltage signal having positive and negative portions, and said means for generating a frequency modulated pulse train of signals is responsive to the rectified load voltage signal.
Claim 6
Dependent Claim
30 words
The apparatus of claim 1 further including zero crossing means for determining a change in the sign of the load voltage and providing a representative signal to the logic means.
Claim 7
Dependent Claim
29 words
The apparatus of claim 5 wherein the logic means is responsive to the zero crossings of the load voltage and the signal representing the amount of electric energy used.
Claim 8
Dependent Claim
56 words
The apparatus of claim 1 wherein the means for generating a load current signal comprises means for selectively providing either a positive or negative signal having an amplitude proportional to the amplitude of the load current, the amplitude the load current signal being negative only when one of the load voltage or load current is negative.
Claim 9
Dependent Claim
62 words
The apparatus of claim 1 wherein the means for generating a load current signal comprises: means for providing a positive signal proportional to the amplitude of the load current; means for providing a negative signal proportional to the amplitude of the load current; and switch means for transmitting either the positive signal or negative signal in response to a received logic signal.
Claim 10
Dependent Claim
13 words
The apparatus of claim 8 wherein the switch means comprises an analog gate.
Claim 11
Dependent Claim
18 words
The apparatus of claim 8 wherein the switch means is responsive to a signal from said logic means.
Claim 12
Dependent Claim
44 words
The apparatus of claim 8 wherein the switch means comprises means for transmitting either the positive signal or negative signal in response to a predetermined logical combination of signals representing the zero crossing of the loading voltage and the amount of electric energy used.
Claim 13
Dependent Claim
42 words
The apparatus of claim 1 further comprising means for integrating over time the output signal representing the product of the instantaneous load voltage and the instantaneous load current to generate a signal representing the amount of electric energy used by the load.
Claim 14
Dependent Claim
14 words
The apparatus of claim 12 wherein the means for integrating comprises an up-down integrator.
Claim 15
Dependent Claim
40 words
The apparatus of claim 13 wherein the up-down integrator comprises means for integrating up or down in response to a predetermined logical combination of signals representing the zero crossing of the load voltage and the amount of electric energy used.
Claim 16
Dependent Claim
31 words
The apparatus of claim 12 further comprising comparator means for generating a signal when the signal representing the amount of electric energy used by the load has reached a predetermined level.
Claim 17
Dependent Claim
149 words
Apparatus for electronically measuring the electricity at a load comprising: (a) means for generating a first analog load electric signal proportional to an instantaneous load condition, said means being responsive to any positive and negative portions of the load condition; (b) means for generating a frequency modulated pulse train of signals in response to the first analog signal, the instantaneous frequency of the pulses being proportional to the instantaneous amplitude of the first analog signal; (c) means for generating a second analog load electric signal, and (d) logic means for gating the instantaneous second analog signal during each pulse of the frequency modulated pulse train to generate an output signal, said output signal comprising a train of pulses having a frequency proportional to the instantaneous first signal and an amplitude proportional to the instantaneous second signal, representing the product of the instantaneous first signal and the instantaneous second signal.
Claim 18
Dependent Claim
149 words
Apparatus for electronically measuring the electricity at a load comprising: (a) means for generating a first analog load electric signal proportional to an instantaneous load condition, said means being responsive to any positive and negative portions of the load condition; (b) means for generating a frequency modulated pulse train of signals in response to the first analog signal, the instantaneous frequency of the pulses being proportional to the instantaneous amplitude of the first analog signal; (c) means for generating a second analog load electric signal, and (d) logic means for gating the instantaneous second analog signal during each pulse of the frequency modulated pulse train to generate an output signal, said output signal comprising a train of pulses having a frequency proportional to the instantaneous first signal and an amplitude proportional to the instantaneous second signal, representing the product of the instantaneous first signal and the instantaneous second signal.
Claim 19
Dependent Claim
28 words
The apparatus of claim 16 wherein the means for generating a first analog signal comprises means for generating an analog load voltage proportional to an instantaneous load voltage.
Claim 20
Dependent Claim
28 words
The apparatus of claim 16 wherein the means for generating a first analog signal comprises means for generating an analog load signal proportional to an instantaneous load voltage.
Claim 21
Dependent Claim
31 words
The apparatus of claim 16 wherein the means for generating a first analog signal comprises means for generating an analog signal having a predetermined phase shift from the instantaneous load condition.
Claim 22
Dependent Claim
23 words
The apparatus of claim 16 wherein the means for generating a first analog signal comprises means for generating a signal dependent upon temperature.
Claim 23
Dependent Claim
29 words
The apparatus of claim 16 wherein the means for generating a second analog signal comprises means for generating an analog load current signal proportional to an instantaneous load current.
Claim 24
Dependent Claim
22 words
The apparatus of claim 16 wherein the means for generating a second analog signal comprises means for generating a constant amplitude signal.
Claim 25
Dependent Claim
27 words
The apparatus of claim 16 wherein the means for generating a second analog signal comprises means for generating a signal equivalent in amplitude to the first signal.
Claim 26
Independent Claim
160 words
A method of electronically measuring the electricity used by a load, the method comprising: (a) generating an analog load voltage signal in response to an input voltage signal proportional to the instantaneous load voltage and any positive and negative portions of the load voltage; (b) generating a frequency modulated pulse train signal in response to the load voltage signal, the instantaneous frequency of the pulses being proportional to the instantaneous amplitude of the load voltage signal; (c) generating an analog load current signal proportional to the instantaneous load current and any positive and negative portions of the load current; and (d) gating the instantaneous load current signal during each pulse of the frequency modulated pulse train to generate an output signal, said output signal comprising a train of pulses having a frequency proportional to the instantaneous load voltage and an amplitude proportional to the instantaneous load current, representing the product of the instantaneous load voltage and the instantaneous load current.
Claim 27
Independent Claim
160 words
A method of electronically measuring the electricity used by a load, the method comprising: (a) generating an analog load voltage signal in response to an input voltage signal proportional to the instantaneous load voltage and any positive and negative portions of the load voltage; (b) generating a frequency modulated pulse train signal in response to the load voltage signal, the instantaneous frequency of the pulses being proportional to the instantaneous amplitude of the load voltage signal; (c) generating an analog load current signal proportional to the instantaneous load current and any positive and negative portions of the load current; and (d) gating the instantaneous load current signal during each pulse of the frequency modulated pulse train to generate an output signal, said output signal comprising a train of pulses having a frequency proportional to the instantaneous load voltage and an amplitude proportional to the instantaneous load current, representing the product of the instantaneous load voltage and the instantaneous load current.
Claim 28
Dependent Claim
30 words
The method of claim 24 further comprising the step of integrating the output signal over time to generate a signal representing the amount of electric energy used by the load.
Claim 29
Dependent Claim
23 words
The method of claim 25 wherein the step of integrating the output signal over time comprises the step of integrating up or down.
Claim 30
Dependent Claim
42 words
The method of claim 26 wherein the step of integrating up or down comprises integrating up or down in response to a predetermined logical combination of signals representing the zero crossing of the load voltage and the amount of electric energy used.
Claim 31
Dependent Claim
36 words
The method of claim 24 wherein the step of generating a frequency modulated pulse train of signals comprises generating a train of uniform pulses, each pulse having substantially the same duration and substantially the same amplitude.
Claim 32
Dependent Claim
24 words
The method of claim 24 wherein the step of generating a frequency modulated pulse train of signals comprises generating a train of unidirectional pulses.
Claim 33
Dependent Claim
69 words
The method of claim 24 wherein the step of generating an analog load voltage signal comprises generating a rectified load voltage signal proportional to the instantaneous load voltage in response to an input voltage signal having positive and negative portions, and the step of generating a frequency modulated pulse train of signals comprises generating a frequency modulated pulse train of signals in response to the rectified load voltage signal.
Claim 34
Dependent Claim
61 words
The method of claim 24 wherein the step of generating a load current signal comprises transmitting either a positive or negative load current signal having an amplitude proportional to the amplitude of the load current in response to the receipt of a logical combination of signals representing the zero crossing of the load voltage and the amount of electric energy used.
Claim 35
Dependent Claim
61 words
The method of claim 24 wherein the step of gating the load current signal comprises transmitting either a positive or negative load current signal having an amplitude proportional to the amplitude of the load current in response to the receipt of a logical combination of signals representing the zero crossing of the load voltage and the amount of electric energy used.
Claim 36
Dependent Claim
55 words
The method of claim 24 wherein the step of generating a load current signal comprises selectively providing either a positive or negative load current signal having an amplitude proportional to the amplitude of the load current, and providing a negative load current signal only when one of the load voltage or load current is negative.
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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) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |