Patent US3731190A successfully refreshed from Google Patents.
US3731190A
Expired / Lapsed
US
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Switching circuit for measuring the electrical power in two energy flow directions (delivered and returned)
Assignee: Siemens AG
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Filing: 1972-06-12
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Granted: 1973-05-01
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Expires: 1992-06-12
Abstract
Abstract An electronic counter for measuring the electrical power in two energy flow directions (delivered and returned) is disclosed. The circuit comprises an integrator for the product of current and voltage, and a first pair of threshold circuits having a predetermined positive voltage threshold circuit and a predetermined negative voltage threshold circuit connected at their outputs to a bistable flip flop circuit. A second pair of threshold circuits, whose two predetermined threshold levels are higher than the threshold levels of the first pair of threshold circuits, is connected in parallel with the first pair of threshold circuits. An additional flip flop circuit is connected after this second threshold circuit. The outputs of the two flip flop circuits are connected via an exclusive OR circuit to the input of the integrator to change the polarity of the input signal in response to changes in direction of the power flow. Two counters are connected through a gate circuit to the outputs of the flip flop circuits to count signals proportional to the power and to feed the signal to one counter for energy flow in one direction and to the second counter for energy flow in the opposite direction.
Inventors
- 👤 M Schwendtner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:43
CPC Classifications
G; G01; G01R; G01R21/00; G01R21/133; G06; G06G; G06G7/00; G06G7/12; G06G7/18; G06G7/184; G06G7/186
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
262 words
A switching circuit for measuring electrical power in two energy flow directions comprising an integrator means to obtain the integral of the product of the current and voltage formed by a multiplier, a first pair of threshold circuits connected to the output of the integrator means, one of the threshold circuits having a predetermined positive voltage threshold and the other threshold circuit having a predetermined negative voltage threshold, a bistable flip flop circuit connected to the output of the threshold circuits, a second pair of threshold circuits connected to the output of the integrator means, one of the threshold circuits having a predetermined positive voltage threshold greater than the positive voltage threshold of the first positive threshold circuit, the other of the threshold circuits having a predeterminEd negative voltage threshold greater than the negative threshold voltage of the first negative threshold circuit, a second flip flop circuit connected to the output of the threshold circuits, an exclusive OR circuit connected to the output of both of the flip flop circuits, the output of the OR circuit being connected to the input of the integrator means to reverse the polarity of the input signal to the integrator when the direction of the energy flow changes, a gate circuit connected to the output of the flip flop circuits, and a first and a second counter connected to the output of the gate circuit, the first counter receiving an input from the gate circuit for power flow in one direction, and the second counter receiving the signal for power energy flow in the opposite direction.
Claim 2
Dependent Claim
262 words
A switching circuit for measuring electrical power in two energy flow directions comprising an integrator means to obtain the integral of the product of the current and voltage formed by a multiplier, a first pair of threshold circuits connected to the output of the integrator means, one of the threshold circuits having a predetermined positive voltage threshold and the other threshold circuit having a predetermined negative voltage threshold, a bistable flip flop circuit connected to the output of the threshold circuits, a second pair of threshold circuits connected to the output of the integrator means, one of the threshold circuits having a predetermined positive voltage threshold greater than the positive voltage threshold of the first positive threshold circuit, the other of the threshold circuits having a predeterminEd negative voltage threshold greater than the negative threshold voltage of the first negative threshold circuit, a second flip flop circuit connected to the output of the threshold circuits, an exclusive OR circuit connected to the output of both of the flip flop circuits, the output of the OR circuit being connected to the input of the integrator means to reverse the polarity of the input signal to the integrator when the direction of the energy flow changes, a gate circuit connected to the output of the flip flop circuits, and a first and a second counter connected to the output of the gate circuit, the first counter receiving an input from the gate circuit for power flow in one direction, and the second counter receiving the signal for power energy flow in the opposite direction.
Claim 3
Dependent Claim
54 words
A switching circuit for measuring electrical power in two energy flow directions as set forth in claim 1 further comprising a compensation circuit connected to the output of the second pair of threshold circuits for feeding a compensation current to the input of the integrator means to overcome the error signals of the integrator.
Claim 4
Dependent Claim
40 words
A switching circuit for measuring electrical power in two energy flow directions as set forth in claim 2 wherein the maximum compensation current is substantially equal to the maximum input voltage divided by the input resistance of the integrator means.
References Cited (Backward Citations)
US3510772A
Cited
US3470471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |