US3760273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic watt hour meter
Assignee: MC CULLOCH CORP
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Filing: 1971-06-24
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Granted: 1973-09-18
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Expires: 1991-06-24
Abstract
Abstract A method of measuring a selected unit of energy such as a watt hour comprising the steps of measuring the current flowing through a load, measuring the voltage across the load, generating a first series of periodic pulses related in width to the rms value of the current measured and related in amplitude to the rms value of the voltage measured, integrating the first series of pulses, and generating a second series of pulses related in number to the integral by generating a pulse each time that a capacitor is charged from the integrated signal to a predetermined voltage. The range of measurement is extended by modifying the method so that the first series of pulses are not directly integrated but rather are first converted to a second series of pulses from a constant current source which second series of pulses are integrated. The invention also relates to the electronic circuitry of a watt hour meter including means for generating a series of pulses having a width directly related to the measured current, means for multiplying the series of pulses representing the measured current and the unknown voltage, means for integrating the multiplied signal, and means for developing a series of pulses related in number to the integral by generating a pulse each time that a capacitor is charged from the integrated signal to a predetermined value.
Inventors
- 👤 W Burkett
- 👤 G Carlsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:15
CPC Classifications
G; G01; G01R; G01R21/00; G01R21/127
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
116 words
Method of measuring a selected unit of energy in an electrical circuit comprising the steps of: developing a first direct-current voltage related to the rms value of the current flowing in the circuit; developing a second direct-current voltage related to the rms value of the voltage across the circuit; generating a first series of periodic pulses, each pulse having a width related to the level of the first direct-current voltage and an amplitude related to the level of the second direct-current voltage; integrating the first series of pulses; and generating a second series of pulses related in number to the integral by generating a pulse each time that a selected voltage level is attained upon integration.
Claim 2
Dependent Claim
116 words
Method of measuring a selected unit of energy in an electrical circuit comprising the steps of: developing a first direct-current voltage related to the rms value of the current flowing in the circuit; developing a second direct-current voltage related to the rms value of the voltage across the circuit; generating a first series of periodic pulses, each pulse having a width related to the level of the first direct-current voltage and an amplitude related to the level of the second direct-current voltage; integrating the first series of pulses; and generating a second series of pulses related in number to the integral by generating a pulse each time that a selected voltage level is attained upon integration.
Claim 3
Dependent Claim
19 words
Method of claim 1 further comprising the additional step of counting the pulses in the second series of pulses.
Claim 4
Dependent Claim
157 words
Method of measuring the total energy supplied by a source or absorbed by a load comprising the steps of generating a first reference voltage having a sawtooth waveform at a preselected frequency, generating a first d.c. voltage proportional to the rms value of the measured current, comparing the reference voltage and the first d.c. voltage, generating a first series of pulses having a width proportional to the rms value of the measured current, generating a second d.c. voltage proportional to the rms value of the measured voltage, generating a second series of pulses having a width proportional to the rms value of the measured current and an amplitude proportional to the rms value of the measured voltage, integrating the second series of pulses, and generating a third series of pulses related in number to the integral by generating a pulse each time that a capacitor is Charged from the second series of pulses to a predetermined value.
Claim 5
Dependent Claim
157 words
Method of measuring the total energy supplied by a source or absorbed by a load comprising the steps of generating a first reference voltage having a sawtooth waveform at a preselected frequency, generating a first d.c. voltage proportional to the rms value of the measured current, comparing the reference voltage and the first d.c. voltage, generating a first series of pulses having a width proportional to the rms value of the measured current, generating a second d.c. voltage proportional to the rms value of the measured voltage, generating a second series of pulses having a width proportional to the rms value of the measured current and an amplitude proportional to the rms value of the measured voltage, integrating the second series of pulses, and generating a third series of pulses related in number to the integral by generating a pulse each time that a capacitor is Charged from the second series of pulses to a predetermined value.
Claim 6
Dependent Claim
23 words
Method of measuring in accordance with claim 3 further comprising the additional step of counting the pulses in the third series of pulses.
Claim 7
Dependent Claim
169 words
Energy meter for determining the energy in an electrical circuit comprising means for developing a first direct-current voltage level related to the rms value of the current flowing in the circuit; means for developing a second direct-current voltage level related to the rms value of the voltage across the circuit; circuit means for generating a first series of pulses, each pulse having a width related to the level of the first direct-current voltage; circuit means for multiplying the first series of pulses and the second direct-current voltage to produce a second series of pulses with each pulse therein having a pulse width related to the value of the first direct-current voltage and an amplitude related to the value of the second direct-current voltage, an integrating circuit for integrating the second series of pulses to produce a voltage level representative of a preselected unit of energy; and circuit means responsive to the voltage level for producing an output pulse each time the voltage level is attained in the integrating circuit.
Claim 8
Dependent Claim
169 words
Energy meter for determining the energy in an electrical circuit comprising means for developing a first direct-current voltage level related to the rms value of the current flowing in the circuit; means for developing a second direct-current voltage level related to the rms value of the voltage across the circuit; circuit means for generating a first series of pulses, each pulse having a width related to the level of the first direct-current voltage; circuit means for multiplying the first series of pulses and the second direct-current voltage to produce a second series of pulses with each pulse therein having a pulse width related to the value of the first direct-current voltage and an amplitude related to the value of the second direct-current voltage, an integrating circuit for integrating the second series of pulses to produce a voltage level representative of a preselected unit of energy; and circuit means responsive to the voltage level for producing an output pulse each time the voltage level is attained in the integrating circuit.
Claim 9
Dependent Claim
23 words
Energy meter in accordance with claim 5 further comprising circuit means for counting the pulses at the output of the producing circuit means.
Claim 10
Dependent Claim
208 words
Energy meter for determining the energy from a source or the energy absorbed by a load comprising means for measuring the current to the load, means for measuring the voltage across the load, circuit means for generating a reference voltage having a sawtooth waveform at a preselected frequency, circuit means for generating a first d.c. voltage proportional to the rms value of the measured current, circuit means for comparing the reference voltage and the first d.c. voltage and for generating a first series of periodic pulses having a pulse width proportional to the rms value of the measured current, means for generating a second d.c. voltage proportional to the rms value of the measured voltage, circuit means for multiplying the first series of pulses and the second d.c. voltage to produce a second series of periodic pulses having a pulse width proportional to the rms value of the measured current and a pulse amplitude proportional to the rms value of the measured voltage, circuit means for integrating the second series of pulses to produce a voltage level representative of a preselected unit of energy, and circuit means responsive to the voltage level for producing an output pulse each time the voltage level is attained in the integrating circuit.
Claim 11
Dependent Claim
208 words
Energy meter for determining the energy from a source or the energy absorbed by a load comprising means for measuring the current to the load, means for measuring the voltage across the load, circuit means for generating a reference voltage having a sawtooth waveform at a preselected frequency, circuit means for generating a first d.c. voltage proportional to the rms value of the measured current, circuit means for comparing the reference voltage and the first d.c. voltage and for generating a first series of periodic pulses having a pulse width proportional to the rms value of the measured current, means for generating a second d.c. voltage proportional to the rms value of the measured voltage, circuit means for multiplying the first series of pulses and the second d.c. voltage to produce a second series of periodic pulses having a pulse width proportional to the rms value of the measured current and a pulse amplitude proportional to the rms value of the measured voltage, circuit means for integrating the second series of pulses to produce a voltage level representative of a preselected unit of energy, and circuit means responsive to the voltage level for producing an output pulse each time the voltage level is attained in the integrating circuit.
Claim 12
Dependent Claim
23 words
Energy meter in accordance with claim 7 further comprising circuit means for counting the pulses at the output of the producing circuit means.
Claim 13
Dependent Claim
163 words
An energy meter for determining the energy in an electrical circuit comprising: a current measuring section including a means for developing a first direct-current voltage level representative of the current flowing in the circuit, means for developing a reference voltage having a sawtooth waveform and a preselected period, and a digital comparator circuit means for comparing the voltage level representing the measured current and the reference voltage, the digital comparator changing states when the reference voltage reaches the voltage level representing the measured current for developing a series of pulses having a width related to the magnitude of the measured current; a voltage measuring section for developing a second direct-current voltage level related to the measured voltage; a multiplier section for combining the first series of pulses having a pulse width representing the measured current and the voltage level representing the measured voltage; and a measuring section including means for referencing the output of the multiplier section to a preselected interval of time.
Claim 14
Dependent Claim
163 words
An energy meter for determining the energy in an electrical circuit comprising: a current measuring section including a means for developing a first direct-current voltage level representative of the current flowing in the circuit, means for developing a reference voltage having a sawtooth waveform and a preselected period, and a digital comparator circuit means for comparing the voltage level representing the measured current and the reference voltage, the digital comparator changing states when the reference voltage reaches the voltage level representing the measured current for developing a series of pulses having a width related to the magnitude of the measured current; a voltage measuring section for developing a second direct-current voltage level related to the measured voltage; a multiplier section for combining the first series of pulses having a pulse width representing the measured current and the voltage level representing the measured voltage; and a measuring section including means for referencing the output of the multiplier section to a preselected interval of time.
Claim 15
Dependent Claim
192 words
An energy Meter for determining the energy in an electrical circuit comprising a current measuring section including a means for developing a first direct-current voltage level representative of the current flowing in the circuit, means for developing a reference voltage having a sawtooth waveform at a preselected period, and means for comparing the first direct-current voltage level and the reference voltage for developing a first series of pulses with each pulse having a width determined by the first direct-current voltage level; a voltage measuring section for developing a second direct-current voltage level representative of the voltage across the circuit; a multiplier section responsive to the first series of pulses and the second direct-current voltage level for producing a second series of pulses, each pulse in the second series having an amplitude related to the second direct-current voltage level and a width related to the first direct-current voltage level; and a measuring and recording section including means for integrating the second series of pulses, and means responsive to a predetermined level of voltage across the integrating means for counting the number of times the voltage across the integrating means attains the predetermined value.
Claim 16
Dependent Claim
192 words
An energy Meter for determining the energy in an electrical circuit comprising a current measuring section including a means for developing a first direct-current voltage level representative of the current flowing in the circuit, means for developing a reference voltage having a sawtooth waveform at a preselected period, and means for comparing the first direct-current voltage level and the reference voltage for developing a first series of pulses with each pulse having a width determined by the first direct-current voltage level; a voltage measuring section for developing a second direct-current voltage level representative of the voltage across the circuit; a multiplier section responsive to the first series of pulses and the second direct-current voltage level for producing a second series of pulses, each pulse in the second series having an amplitude related to the second direct-current voltage level and a width related to the first direct-current voltage level; and a measuring and recording section including means for integrating the second series of pulses, and means responsive to a predetermined level of voltage across the integrating means for counting the number of times the voltage across the integrating means attains the predetermined value.
Claim 17
Dependent Claim
187 words
Energy meter for determining the energy in an electrical circuit comprising: a current measuring section including means for developing a first direct-current voltage related to the rms value of the current flowing in the circuit, and for producing a series of voltage pulses, with each pulse having a width related to the level of the first direct-current voltage; a voltage measuring section including means for developing a second direct-current voltage related to the rms value of the voltage across the circuit; a unity gain amplifier responsive to the second direct current voltage during an interval of time related to the level of the first direct-current voltage to produce a series of pulses representative of the power in the circuit; an integrating capacitor for relating the measured power to time; a constant current source for charging the integrating capacitor with a current related to the second direct-current voltage level and for discrete intervals of time related to the first direct-current voltage level; and means responsive to a predetermined voltage across the integrating capacitor for counting selected units of energy represented by the predetermined voltage across the integrating capacitor.
Claim 18
Dependent Claim
187 words
Energy meter for determining the energy in an electrical circuit comprising: a current measuring section including means for developing a first direct-current voltage related to the rms value of the current flowing in the circuit, and for producing a series of voltage pulses, with each pulse having a width related to the level of the first direct-current voltage; a voltage measuring section including means for developing a second direct-current voltage related to the rms value of the voltage across the circuit; a unity gain amplifier responsive to the second direct current voltage during an interval of time related to the level of the first direct-current voltage to produce a series of pulses representative of the power in the circuit; an integrating capacitor for relating the measured power to time; a constant current source for charging the integrating capacitor with a current related to the second direct-current voltage level and for discrete intervals of time related to the first direct-current voltage level; and means responsive to a predetermined voltage across the integrating capacitor for counting selected units of energy represented by the predetermined voltage across the integrating capacitor.
Claim 19
Dependent Claim
200 words
An energy meter for determining the energy in an electrical circuit comprising: a current measuring section including a means for developing a first direct-current voltage level representative of the current flowing in the circuit; means for developing a reference voltage having a sawtooth waveform and a preselected period, and means for comparing the first direct-current voltage level and the reference voltage for developing a series of pulses with each pulse having a width related to the first direct-current voltage level; a voltage measuring section for developing a second direct-current voltage level related to the measured voltage; a unity gain amplifier responsive to the second direct-current voltage level during an interval of time related to the first direct-current voltage level to produce a series of pulses representative of the power in the circuit; an integrating capacitor for relating the measured power to time; a constant current source for charging the integrating capacitor with a current determined by the second direct-current voltage level and for discrete intervals of time determined by the first direct-current voltage level; and means responsive to a predetermined voltage across the integrating capacitor for counting selected units of energy represented by the predetermined voltage across the integrating capacitor.
Claim 20
Dependent Claim
200 words
An energy meter for determining the energy in an electrical circuit comprising: a current measuring section including a means for developing a first direct-current voltage level representative of the current flowing in the circuit; means for developing a reference voltage having a sawtooth waveform and a preselected period, and means for comparing the first direct-current voltage level and the reference voltage for developing a series of pulses with each pulse having a width related to the first direct-current voltage level; a voltage measuring section for developing a second direct-current voltage level related to the measured voltage; a unity gain amplifier responsive to the second direct-current voltage level during an interval of time related to the first direct-current voltage level to produce a series of pulses representative of the power in the circuit; an integrating capacitor for relating the measured power to time; a constant current source for charging the integrating capacitor with a current determined by the second direct-current voltage level and for discrete intervals of time determined by the first direct-current voltage level; and means responsive to a predetermined voltage across the integrating capacitor for counting selected units of energy represented by the predetermined voltage across the integrating capacitor.
Claim 21
Dependent Claim
149 words
An energy meter for determining the energy in an electrical circuit comprisIng: means for developing a first direct-current voltage level related to the current flowing in the circuit; means for developing a second direct-current voltage level related to the voltage across the circuit; an integrating capacitor; circuit means for charging the integrating capacitor, said circuit means appearing as a constant current source to the integrating capacitor; circuit means for making the capacitor charging means responsive to the first and second direct-current voltage levels for applying a charging current to the integrating capacitor at a rate determined by the second direct-current voltage level and for a duration determined by the first direct-current voltage level; and means for generating a series of pulses related in number to the integral by generating a pulse each time the integrating capacitor is charged to a predetermined voltage representative of a predetermined unit of energy.
Claim 22
Dependent Claim
149 words
An energy meter for determining the energy in an electrical circuit comprisIng: means for developing a first direct-current voltage level related to the current flowing in the circuit; means for developing a second direct-current voltage level related to the voltage across the circuit; an integrating capacitor; circuit means for charging the integrating capacitor, said circuit means appearing as a constant current source to the integrating capacitor; circuit means for making the capacitor charging means responsive to the first and second direct-current voltage levels for applying a charging current to the integrating capacitor at a rate determined by the second direct-current voltage level and for a duration determined by the first direct-current voltage level; and means for generating a series of pulses related in number to the integral by generating a pulse each time the integrating capacitor is charged to a predetermined voltage representative of a predetermined unit of energy.
Claim 23
Dependent Claim
21 words
A meter in accordance with claim 13 further including means for counting the number of pulses in said series of pulses.
Claim 24
Dependent Claim
173 words
An energy meter for determining the energy in an electrical circuit comprising: circuit means for developing a first direct-current voltage having a level representative of the current flowing in the circuit; a reference voltage source having a sawtooth waveform; a comparator for comparing the first direct-current voltage level and the reference voltage for producing a series of voltage pulses having a pulse width related to the first direct-current voltage level; circuit means for developing a second direct-current voltage level representative of the voltage applied to the circuit; a transistor gate circuit for developing a second series of voltage pulses having an amplitude related to the second direct-current voltage level and a pulse width related to the first direct-current voltage level; an integrating capacitor; means for applying the second series of pulses to the integrating capacitor; switch means responsive to a predetermined voltage for discharging the capacitor each time a selected unit of energy is applied to the electrical circuit; and circuit means responsive to the switching means for counting the units of energy.
Claim 25
Dependent Claim
173 words
An energy meter for determining the energy in an electrical circuit comprising: circuit means for developing a first direct-current voltage having a level representative of the current flowing in the circuit; a reference voltage source having a sawtooth waveform; a comparator for comparing the first direct-current voltage level and the reference voltage for producing a series of voltage pulses having a pulse width related to the first direct-current voltage level; circuit means for developing a second direct-current voltage level representative of the voltage applied to the circuit; a transistor gate circuit for developing a second series of voltage pulses having an amplitude related to the second direct-current voltage level and a pulse width related to the first direct-current voltage level; an integrating capacitor; means for applying the second series of pulses to the integrating capacitor; switch means responsive to a predetermined voltage for discharging the capacitor each time a selected unit of energy is applied to the electrical circuit; and circuit means responsive to the switching means for counting the units of energy.
Claim 26
Dependent Claim
227 words
An energy meter for determining the energy in an electrical circuit comprising: circuit means for developing a first direct-current voltage having a level representative of the current flowing in the circuit; a reference voltage source having a sawtooth waveform; a comparator for comparing the first direct-current voltage level and the reference voltage for producing a series of voltage pulses having a pulse width related to the first direct-current voltage level; means for developing a second direct-current voltage level representative of the voltage across the circuit; a unity gain amplifier having an input terminal and an output terminal; a voltage divider network for splitting the second direct-current voltage into two voltages having a predetermined ratio; means for applying one of the voltages of the voltage divider network to the input of the unity gain amplifier during an interval of time related to the first direct-current voltage level; an effective constant current source responsive to the output of the unity gain amplifier; an integrating capacitor; means for applying the output of the constant current source to the integrating capacitor; switch means responsive to a predetermined voltage across the integrating capacitor for discharging the capacitor each time a selected unit of energy is supplied to the circuit as represented by the predetermined voltage across the capacitor; and circuit means responsive to the switching means for counting the units of energy.
Claim 27
Dependent Claim
227 words
An energy meter for determining the energy in an electrical circuit comprising: circuit means for developing a first direct-current voltage having a level representative of the current flowing in the circuit; a reference voltage source having a sawtooth waveform; a comparator for comparing the first direct-current voltage level and the reference voltage for producing a series of voltage pulses having a pulse width related to the first direct-current voltage level; means for developing a second direct-current voltage level representative of the voltage across the circuit; a unity gain amplifier having an input terminal and an output terminal; a voltage divider network for splitting the second direct-current voltage into two voltages having a predetermined ratio; means for applying one of the voltages of the voltage divider network to the input of the unity gain amplifier during an interval of time related to the first direct-current voltage level; an effective constant current source responsive to the output of the unity gain amplifier; an integrating capacitor; means for applying the output of the constant current source to the integrating capacitor; switch means responsive to a predetermined voltage across the integrating capacitor for discharging the capacitor each time a selected unit of energy is supplied to the circuit as represented by the predetermined voltage across the capacitor; and circuit means responsive to the switching means for counting the units of energy.
Claim 28
Dependent Claim
94 words
An amp hour meter comprising: means for developing a first direct-current voltage level representative of the current flowing in an electrical circuit; means for generating a firSt series of periodic pulses having a pulse width related to the first direct-current voltage level and having a constant predetermined amplitude; an integrating circuit for integrating the first series of pulses to produce a voltage level representative of a preselected unit of energy; and circuit means reponsive to the voltage level for producing an output pulse each time the voltage level is attained in the integrating circuit.
Claim 29
Dependent Claim
94 words
An amp hour meter comprising: means for developing a first direct-current voltage level representative of the current flowing in an electrical circuit; means for generating a firSt series of periodic pulses having a pulse width related to the first direct-current voltage level and having a constant predetermined amplitude; an integrating circuit for integrating the first series of pulses to produce a voltage level representative of a preselected unit of energy; and circuit means reponsive to the voltage level for producing an output pulse each time the voltage level is attained in the integrating circuit.
Claim 30
Dependent Claim
207 words
A digital wattmeter comprising a circuit means for developing a first continuous direct-current voltage level representative of the rms value of the current in an alternating-current circuit or of the magnitude of the current in a direct-current circuit; a ramp generator; circuit means for comparing the output of the ramp generator to the first voltage level, the comparing means having a digital output of a first series of pulses with the duration between pulses being directly proportional to the rms value or direct-current level of current; circuit means for developing a second continuous direct-current voltage level representative of the rms value of the voltage in an alternating-current circuit or of the voltage in a direct-current circuit, circuit means for multiplying the first series of pulses and the second direct-current voltage level to produce a second series of pulses having a pulse width proportional to the first voltage level and a pulse amplitude proportional to the second voltage level; an integrating circuit for integrating the second series of pulses to produce a third voltage level representative of a preselected unit of energy; and circuit means responsive to the third voltage level for producing an output pulse each time the third voltage level is attained in the integrating circuit.
Claim 31
Dependent Claim
207 words
A digital wattmeter comprising a circuit means for developing a first continuous direct-current voltage level representative of the rms value of the current in an alternating-current circuit or of the magnitude of the current in a direct-current circuit; a ramp generator; circuit means for comparing the output of the ramp generator to the first voltage level, the comparing means having a digital output of a first series of pulses with the duration between pulses being directly proportional to the rms value or direct-current level of current; circuit means for developing a second continuous direct-current voltage level representative of the rms value of the voltage in an alternating-current circuit or of the voltage in a direct-current circuit, circuit means for multiplying the first series of pulses and the second direct-current voltage level to produce a second series of pulses having a pulse width proportional to the first voltage level and a pulse amplitude proportional to the second voltage level; an integrating circuit for integrating the second series of pulses to produce a third voltage level representative of a preselected unit of energy; and circuit means responsive to the third voltage level for producing an output pulse each time the third voltage level is attained in the integrating circuit.
Claim 32
Dependent Claim
90 words
Method of measuring a selected unit of electrical energy in an electrical circuit comprising the steps of developing a first direct-current voltage level representative of the current flowing in the circuit; generating a first series of periodic pulses, each pulse having a width related to the level of the first direct-current voltage and having a constant predetermined amplitude; integrating the first series of pulses; and generating a second series of pulses related in number to the integral by generating a pulse each time that a predetermined voltage level is attained.
Claim 33
Dependent Claim
90 words
Method of measuring a selected unit of electrical energy in an electrical circuit comprising the steps of developing a first direct-current voltage level representative of the current flowing in the circuit; generating a first series of periodic pulses, each pulse having a width related to the level of the first direct-current voltage and having a constant predetermined amplitude; integrating the first series of pulses; and generating a second series of pulses related in number to the integral by generating a pulse each time that a predetermined voltage level is attained.
Claim 34
Dependent Claim
104 words
Method of measuring a selected unit of energy in an electrical circuit comprising the steps of developing a first direct-current voltage level representative of the current flowing in the circuit; developing a second direct-current voltage level representative of the voltage across the circuit; generating a first series of periodic pulses, each pulse having a width related to the first direct-current voltage level and an amplitude related to the second direct-current voltage level; integrating the first series of pulses; and generating a second series of pulses related in number to the integral by generating a pulse each time that a predetermined voltage level is attained.
Claim 35
Dependent Claim
104 words
Method of measuring a selected unit of energy in an electrical circuit comprising the steps of developing a first direct-current voltage level representative of the current flowing in the circuit; developing a second direct-current voltage level representative of the voltage across the circuit; generating a first series of periodic pulses, each pulse having a width related to the first direct-current voltage level and an amplitude related to the second direct-current voltage level; integrating the first series of pulses; and generating a second series of pulses related in number to the integral by generating a pulse each time that a predetermined voltage level is attained.
Claim 36
Dependent Claim
153 words
An energy meter comprising means for developing a first direct-current voltage level representative of the current flowing in an electrical circuit; means for developing a second direct-current voltage level representative of the voltage across the electrical circuit; circuit means for generating a first series of periodic pulses, each pulse having a width related to the first direct-current voltage level; circuit means for multiplying the first series of pulses and the second direct-current voltage level to produce a second series of pulses with each pulse therein having a width related to the first direct-current voltage level and an amplitude related to the second direct-current voltage level; an integrating circuit for integrating the second series of pulses to repeatedly produce a voltage level representative of a preselected unit of energy; and circuit means resPonsive to the voltage level for producing an output pulse each time that the voltage level is attained in the integrating circuit.
Claim 37
Dependent Claim
153 words
An energy meter comprising means for developing a first direct-current voltage level representative of the current flowing in an electrical circuit; means for developing a second direct-current voltage level representative of the voltage across the electrical circuit; circuit means for generating a first series of periodic pulses, each pulse having a width related to the first direct-current voltage level; circuit means for multiplying the first series of pulses and the second direct-current voltage level to produce a second series of pulses with each pulse therein having a width related to the first direct-current voltage level and an amplitude related to the second direct-current voltage level; an integrating circuit for integrating the second series of pulses to repeatedly produce a voltage level representative of a preselected unit of energy; and circuit means resPonsive to the voltage level for producing an output pulse each time that the voltage level is attained in the integrating circuit.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |