US3778693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse-to-revolution converter for converting a variable pulse frequency into a proportional rotation speed of a shaft
Assignee: US Philips Corp
•
Filing: 1972-08-30
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Granted: 1973-12-11
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Expires: 1992-08-30
Abstract
Abstract By providing a conventional pulse-to-revolution converter comprising a motor control circuit and a tacho signal negativefeedback loop with an additional negative-feedback loop an exact ratio is obtainable between the variable pulse repetition frequency of a pulse train and the rotation speed of a rotating shaft coupled to the motor. The shaft carries a shaft position pick-up which via a switching device operates a correction signal source.
Inventors
- 👤 A Korteling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:24
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/18; H02P23/186; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/902; Y10S388/907; Y10S388/908
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
157 words
A pulse frequency-to-revolution converter, comprising a motor having a rotational speed responsive to variations in input voltage and having an output shaft, an input pulse frequency-tovoltage converter for converting input pulses to voltage levels, a voltage supply circuit connecting the pulse frequency to voltage converter to the motor providing the Motor with a voltage corresponding to the output of the pulse frequency-to-voltage converter, a tacho-signal negative feedback means connected between the motor and the supply circuit, a shaft position negative feedback loop connected to the motor shaft for providing pulses corresponding to the motor shaft position, a switching device connected to the shaft position negative feedback loop for providing shaft position switching signals, and a correction signal source connecting the switching device to the pulse frequency-to-voltage converter for providing correction signals to the pulse frequency-to-voltage converter in order to maintain the instant at which a shaft position signal occurs within a repetition period of the input pulses.
Claim 2
Dependent Claim
157 words
A pulse frequency-to-revolution converter, comprising a motor having a rotational speed responsive to variations in input voltage and having an output shaft, an input pulse frequency-tovoltage converter for converting input pulses to voltage levels, a voltage supply circuit connecting the pulse frequency to voltage converter to the motor providing the Motor with a voltage corresponding to the output of the pulse frequency-to-voltage converter, a tacho-signal negative feedback means connected between the motor and the supply circuit, a shaft position negative feedback loop connected to the motor shaft for providing pulses corresponding to the motor shaft position, a switching device connected to the shaft position negative feedback loop for providing shaft position switching signals, and a correction signal source connecting the switching device to the pulse frequency-to-voltage converter for providing correction signals to the pulse frequency-to-voltage converter in order to maintain the instant at which a shaft position signal occurs within a repetition period of the input pulses.
Claim 3
Dependent Claim
69 words
Pulse-to-revolution converter as claimed in claim 1, wherein the switching device is a flip-flop which is set to one state by the shaft position signal and to the other state by an input pulse, and in that the correction signal source includes a semiconductor switch which is controlled by the flip-flop and switches a correction means into and out of circuit, this correction means influencing the pulse frequency converter.
Claim 4
Dependent Claim
41 words
Pulse-to-revolution converter as claimed in claim 2, whereby the pulse frequency-to-voltage converter converts the pulse frequency into a direct voltage and includes a monostable multivibrator, characterized in that the correction means is connected to the timing circuit of the monostable multivibrator.
Claim 5
Dependent Claim
63 words
Pulse-to-revolution converter as claimed in claim 2, wherein the pulse frequency-to-voltage converter is a pulse frequency-to-direct voltage converter comprising a current source which is controlled at each input pulse for a fixed period of time, a parallel combination of a storage capacitor and a resistor connected to the current source, the correction means influencing the amplitude of the current from the current source.
Claim 6
Dependent Claim
53 words
Pulse-to-revolution converter as claimed in claim 2, wherein the pulse frequency-to-voltage converter comprises a pulse frequency-to-direct voltage converter, comprising a parallel combination of a storage capacitor and a discharge circuit across which the output direct voltage may be taken, the correction means comprising a resistor which influences the charge of the storage capacitor.
References Cited (Backward Citations)
US3008075A
Cited
US3241023A
Cited
US3331006A
Cited
US3424966A
Cited
US3500160A
Cited
US3522503A
Cited
US3577056A
Cited
US3656041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |