US3835402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage-frequency converter
Assignee: Siemens AG
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Filing: 1973-03-12
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Granted: 1974-09-10
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Expires: 1993-03-12
Abstract
Abstract A voltage-frequency converter is disclosed and has an integrator which acts as a sawtooth generator. A positive or negative input voltage is alternatively connected to the input of the integrator and both voltages are proportional to a reference voltage. One input voltage is preferably taken off at a voltage divider and the second input voltage is derived from the other by means of an inverting amplifier. The integrator is followed by two limitvalue stages for determining the reversal points of the sawtooth voltage. Datum voltages are supplied to the limit-value stages and are also proportional to the reference voltage. The voltage appearing at the integrator input is disconnected by the output signals of the limit-value stages upon reaching a reversal point of the sawtooth waveform whereupon the voltage of the opposite polarity is connected. The frequency generated by the voltagefrequency converter is independent of the reference voltage.
Inventors
- 👤 C Kublick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:24
CPC Classifications
H; H03; H03K; H03K7/00; H03K7/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
166 words
A voltage-frequency converter comprising an integrator for generating a voltage of periodic waveform whose instantaneous value varies substantially linearly with time between two limit values whereat the slope of the waveform changes sign; a first switch and a second switch for transmitting positive and negative integrator input voltages respectively to the input of said integrator, said input voltages being proportional to a reference voltage; a first limit-value stage and a second limit-value stage respectively connected to the output of said integrator for determining respective ones of said limit values, said limitvalue stages having respective inputs for receiving respective datum voltages also proportional to the above-mentioned reference voltage whereby the periodic waveform generated by said integrator has a frequency independent of said reference voltage; and circuit means monitoring the outputs of said stages for opening one of said switches and for closing the other one of said switches at each of said limit values whereby said positive and negative input voltages are supplied sequentially to said integrator.
Claim 2
Dependent Claim
166 words
A voltage-frequency converter comprising an integrator for generating a voltage of periodic waveform whose instantaneous value varies substantially linearly with time between two limit values whereat the slope of the waveform changes sign; a first switch and a second switch for transmitting positive and negative integrator input voltages respectively to the input of said integrator, said input voltages being proportional to a reference voltage; a first limit-value stage and a second limit-value stage respectively connected to the output of said integrator for determining respective ones of said limit values, said limitvalue stages having respective inputs for receiving respective datum voltages also proportional to the above-mentioned reference voltage whereby the periodic waveform generated by said integrator has a frequency independent of said reference voltage; and circuit means monitoring the outputs of said stages for opening one of said switches and for closing the other one of said switches at each of said limit values whereby said positive and negative input voltages are supplied sequentially to said integrator.
Claim 3
Dependent Claim
34 words
The voltage-frequency converter of claim 1 comprising a voltage divider having fixed terminals for receiving the reference voltage thereacross and having an adjustable tap from which one of said integrator input voltages is taken.
Claim 4
Dependent Claim
33 words
The voltage-frequency converter of claim 1 comprising a voltage divider having fixed terminals for receiving the reference voltage thereacross and having an adjustable tap from which one of said datum voltages is taken.
Claim 5
Dependent Claim
22 words
The voltage-frequency converter of claim 3, the input corresponding to the other one of said datum voltages being connected to zero potential.
Claim 6
Dependent Claim
78 words
The voltage-frequency converter of claim 1 comprising a voltage divider having fixed terminals for receiving the reference voltage thereacross and having an adjustable tap from which one of said integrator input voltages is taken, and a second voltage divider having fixed terminals for receiving the reference voltage thereacross and having an adjustable tap from which one of said datum voltages is taken, the input corresponding to the other one of said datum voltages being connected to zero potential.
Claim 7
Dependent Claim
36 words
The voltage-frequency converter of claim 1 comprising voltage supply means for supplying one of said integrator input voltages, and an inverter-amplifier connected to said supply means for providing the other one of said integrator input voltages.
Claim 8
Dependent Claim
13 words
The voltage-frequency converter of claim 6, said inverter-amplifier having a gain of unity.
Claim 9
Dependent Claim
59 words
The voltage-frequency converter of claim 1, said circuit means being a memory stage respectively connected to the outputs of said limit-value stages, said memory stage having outputs connected to said switches respectively for transmitting output pulses to said switches to open one of said switches and to close the other one of said switches at each of said limit-values.
Claim 10
Dependent Claim
53 words
The voltage-frequency converter of claim 1 comprising a comparator for providing pulses in the manner of a pulse generator, said comparator having two comparator inputs, one of said comparator inputs being connected to the output of said integrator and the other one of said comparator inputs being connected to receive a comparison voltage.
Claim 11
Dependent Claim
80 words
The voltage-frequency converter of claim 9 comprising comparison voltage circuit means for supplying said comparison voltage to said other one of said comparator inputs; and voltage supply means for supplying upper and lower limiting voltages to said comparison voltage circuit means to limit said comparison voltage, said last mentioned limiting voltages being proportional to the reference voltage and lying between the two limit values whereat the slope of the periodic waveform of the voltage generated by said integrator changes sign.
Claim 12
Dependent Claim
58 words
The voltage-frequency converter of claim 10 comprising said comparison voltage circuit means being a regulator arrangement for supplying said comparisOn voltage as the controlled output quantity thereof to said other one of said comparator inputs, said regulator arrangement comprising a regulating amplifier, and said voltage supply means being connected to said regulating amplifier for limiting said comparison voltage.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |