US3674994A
Expired / Lapsed
US
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Method and apparatus for multiplying analog electrical quantities
Assignee: BBC Brown Boveri AG Germany
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Filing: 1969-11-24
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Granted: 1972-07-04
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Expires: 1989-11-24
Abstract
Abstract Apparatus for multiplying analog electrical quantities comprises an integrator, such as a Miller integrator, to whose input can be selectively applied two or more electrical quantities, in the form of positive voltages, or a reference voltage, which is a negative voltage. The output of the integrator is connected to a signal range indicator whose output is connected to the inverted input of an OR gate and to a logical control circuit connected to the output of a start generator. The logical control circuit is connected to the non-inverted input of the OR gate, and the OR gate is connected to one input of an AND gate whose other input has connected thereto a post generator. The output of the AND gate is connected to a counter whose counting direction is controlled by the logical control circuit, and the counter-output is connected to a digital indicator. To multiply the analog electrical quantities, the logical control circuit is activated to apply the first electrical quantity to the integrator and simultaneously to open the AND gate for transmission of a predetermined number of pulses from the pulse generator to the counter counting in the forward direction. After counting of the predetermined number of pulses, the first electrical quantity is disconnected at a first given time and the reference voltage is applied to the integrator while resetting the counter toward zero, until the voltage at the integrator output is zero at a second time. The reference voltage is then disconnected and a second electrical quantity is applied to the integrator while pulses are transmitted to the counter which is still counting in the backward direction, until the counter reading is zero. When the counter reading is zero, the second electrical quantity is disconnected at a third given time, the counter is set to count in the forward direction and the reference voltage is again applied to the integrator while the pulses are transmitted to the counter. The pulse count is then continued until the integrator output voltage is again zero.
Inventors
- 👤 Volker Zimmermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:20
CPC Classifications
G; G06; G06J; G06J1/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
234 words
A method of multiplying analog electrical quantities and numerically indicating the products comprising the steps of activating a logical control circuit to apply a first electrical quantity, in the form of a positive voltage, to the input of an integrator, and simultaneously to open an AND gate for transmission therethrough of a predetermined number No of pulses from a pulse generator to a counter counting in the forward direction; after counting of No pulses, disconnecting the first electrical quantity from the integrator at a first given time; applying a reference voltage, in the form of a negative voltage, to the integrator, while resetting the counter toward zero, until the voltage at the integrator output is zero at a second time; disconnecting the reference voltage from the integrator when the integrator output voltage is zero and applying a second electrical quantity, in the form of a positive voltage, to the input of the integrator while transmitting pulses from the pulse generator to the counter, still counting in the backward direction, until the counter reading is zero; when the counter reading is zero, disconnecting the second electrical quantity from the integrator at a third given time, setting the counter to count in the forward direction and again applying the reference voltage to the integrator while continuing transmission of pulses to the counter; and continuing to count the pulses until the integrator output voltage is again zero.
Claim 2
Independent Claim
234 words
A method of multiplying analog electrical quantities and numerically indicating the products comprising the steps of activating a logical control circuit to apply a first electrical quantity, in the form of a positive voltage, to the input of an integrator, and simultaneously to open an AND gate for transmission therethrough of a predetermined number No of pulses from a pulse generator to a counter counting in the forward direction; after counting of No pulses, disconnecting the first electrical quantity from the integrator at a first given time; applying a reference voltage, in the form of a negative voltage, to the integrator, while resetting the counter toward zero, until the voltage at the integrator output is zero at a second time; disconnecting the reference voltage from the integrator when the integrator output voltage is zero and applying a second electrical quantity, in the form of a positive voltage, to the input of the integrator while transmitting pulses from the pulse generator to the counter, still counting in the backward direction, until the counter reading is zero; when the counter reading is zero, disconnecting the second electrical quantity from the integrator at a third given time, setting the counter to count in the forward direction and again applying the reference voltage to the integrator while continuing transmission of pulses to the counter; and continuing to count the pulses until the integrator output voltage is again zero.
Claim 3
Dependent Claim
40 words
A method of multiplying analog electrical quantities and numerically indicating the products, as claimed in claim 1, including the step of, when the integrator output voltage is again zero, numerically indicating the number of pulses then contained in the counter.
Claim 4
Dependent Claim
43 words
A method of multiplying analog electrical quantities and numerically indicating the products, as claimed in claim 1, including the step of, after the integrator output voltage is again zero, shorting the integrator to prevent reversal of the polarity of the integrator output voltage.
Claim 5
Dependent Claim
191 words
Apparatus for multiplying analog electrical quantities and numerically indicating the products comprising, in combination, and integrator having an input and an output; switch means selectively operable to apply, to the input of said integrator, the analog electrical quantities to be multiplied, in the form of positive voltages, and a reference quantity, in the form of a negative voltage; a logical control circuit controlling selective operation of said switch means; a signal range indicator connected in series with the output of said integrator; an OR member having a negated input and a non-negated input; means connecting the output of said signal range indicator to the negated input of said OR member; means connecting the non-negated input of said OR member to said logical control circuit; a counter; means connecting the output of said OR member to said counter; and a digital indicator connected to the output of said counter; said logical control circuit operating said switch means in a preselected sequence to apply said positive voltages and said negative voltage alternately to the input of said integrator in accordance with the output voltage of said integrator and the reading of said counter.
Claim 6
Dependent Claim
191 words
Apparatus for multiplying analog electrical quantities and numerically indicating the products comprising, in combination, and integrator having an input and an output; switch means selectively operable to apply, to the input of said integrator, the analog electrical quantities to be multiplied, in the form of positive voltages, and a reference quantity, in the form of a negative voltage; a logical control circuit controlling selective operation of said switch means; a signal range indicator connected in series with the output of said integrator; an OR member having a negated input and a non-negated input; means connecting the output of said signal range indicator to the negated input of said OR member; means connecting the non-negated input of said OR member to said logical control circuit; a counter; means connecting the output of said OR member to said counter; and a digital indicator connected to the output of said counter; said logical control circuit operating said switch means in a preselected sequence to apply said positive voltages and said negative voltage alternately to the input of said integrator in accordance with the output voltage of said integrator and the reading of said counter.
Claim 7
Dependent Claim
55 words
Apparatus for multiplying analog electrical quantities and numerically indicating the products, as claimed in claim 4, in which the output of said OR member is connected to one input of an AND member constituting said means connecting said OR member to said counter; and a pulse generator connected to another input of said AND member.
Claim 8
Dependent Claim
35 words
Apparatus for multiplying analog electrical quantities and numerically indicating the products, as claimed in claim 5, including means connecting said logical control circuit to said counter to selectively control the counting direction of said counter.
Claim 9
Dependent Claim
34 words
Apparatus for multiplying analog electrical quantities and numerically indicating the products, as claimed in claim 6, incluDing means connecting the output of said signal range indicator to an input of said logical control circuit.
Claim 10
Dependent Claim
34 words
Apparatus for multiplying analog electrical quantities and numerically indicating the products, as claimed in claim 7, including a start generator connected to said logical control circuit to initiate activation of said logical control circuit.
Claim 11
Dependent Claim
81 words
Apparatus for multiplying analog electrical quantities and numerically indicating the products, as claimed in claim 4, in which said switch means comprises an individual switch for applying each respective positive voltage and said negative voltage to the input of said integrator; and a respective resistance connected between each individual switch and the input of said integrator, the terminals of said resistances remote from the associated individual switches being interconnected at a common junction point connected to the input of said integrator.
Claim 12
Independent Claim
100 words
The method of multiplying analog electrical quantities, comprising the steps of integrating a first electrical quantity over a predetermined time period to establish a first electrical variation range from beginning to the end of the period, integrating a reference quantity and measuring the time needed to vary the integrated output over the first electrical variation range, integrating a second electrical quantity to be multiplied with the first electrical quantity over the measured time to establish a second electrical variation range, and integrating the reference quantity and measuring the time needed to vary the integrated output over the second electrical range.
Claim 13
Independent Claim
100 words
The method of multiplying analog electrical quantities, comprising the steps of integrating a first electrical quantity over a predetermined time period to establish a first electrical variation range from beginning to the end of the period, integrating a reference quantity and measuring the time needed to vary the integrated output over the first electrical variation range, integrating a second electrical quantity to be multiplied with the first electrical quantity over the measured time to establish a second electrical variation range, and integrating the reference quantity and measuring the time needed to vary the integrated output over the second electrical range.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |