US3737773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tachometer circuit
Assignee: Motorola Solutions Inc
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Filing: 1971-07-28
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Granted: 1973-06-05
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Expires: 1991-07-28
Abstract
Abstract A tachometer circuit is provided with a current steering circuit which has a first circuit portion connected to a power source. An input circuit portion of the steering circuit receives input pulse signals of different and/or indiscriminate pulse width which are indicative of the motion of a movable member to cause the output current of the steering circuit to be diverted from one current path to a second current path. A timing circuit is connected to the output circuit portion of the current steering circuit to produce a timed pulse of predetermined duration. Feedback means is provided for applying the timed pulse to the steering circuit to revert its state and again cause current to be directed through the first current path. This will produce a given-width pulse which is integrated with respect to time and used to produce a tachometer reading. An input lockout circuit is connected to the input circuit portion to shunt that portion of the input signal which exceeds the time duration of the givenwidth pulse.
Inventors
- 👤 D Zobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:14
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/4802
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
163 words
A tachometer circuit comprising in combination, an input circuit portion for receiving periodic input pulses which are indicative of the motion of a movable member, timing circuit means connected to said input circuit portion to be responsive to the leading edge of each input pulse to cause the start of a timing pulse, said timing circuit means including means to produce a feedback pulse after a predetermined time interval, means coupling said timing circuit means to said input circuit means to apply said feedback pulse thereto to produce a givenwidth pulse, integrating circuit means responsive to said given-width pulse to produce a tachometer reading corresponding to the number of said given-width pulses per unit time, and input lockout means connected to said input circuit portion and to said timing circuit means, said lockout means being responsive to said feedback pulse to thereafter shunt that portion of said input pulse in said input circuit portion which exceeds the time duration of said given-width pulse.
Claim 2
Dependent Claim
163 words
A tachometer circuit comprising in combination, an input circuit portion for receiving periodic input pulses which are indicative of the motion of a movable member, timing circuit means connected to said input circuit portion to be responsive to the leading edge of each input pulse to cause the start of a timing pulse, said timing circuit means including means to produce a feedback pulse after a predetermined time interval, means coupling said timing circuit means to said input circuit means to apply said feedback pulse thereto to produce a givenwidth pulse, integrating circuit means responsive to said given-width pulse to produce a tachometer reading corresponding to the number of said given-width pulses per unit time, and input lockout means connected to said input circuit portion and to said timing circuit means, said lockout means being responsive to said feedback pulse to thereafter shunt that portion of said input pulse in said input circuit portion which exceeds the time duration of said given-width pulse.
Claim 3
Dependent Claim
82 words
The tachometer circuit of claim 1 wherein said input lockout means includes a silicon controlled rectifier having a gate electrode and an anode-cathode circuit connected between said input circuit portion and ground potential, and feedback circuit means connected between said timing circuit and said gate electrode of said silicon controlled rectifier to render the same conductive during the presence of an input pulse after the predetermined time interval, with the termination of said input pulse causing de-energization of said silicon controlled rectifier.
Claim 4
Dependent Claim
28 words
The tachometer circuit of claim 1 further including reference circuit means connected to said timing circuit means to set the time duration of the timing pulses produced thereby.
Claim 5
Dependent Claim
84 words
The tachometer circuit of claim 1 wherein said input circuit portion includes a flip-flop circuit having set and reset input terminals and an output terminal, said periodic input pulses being applied to said set input terminal, and feedback means connected from said timing circuit means to said reset terminal to reset said flip-flop at the end of said given-width pulse, and series connected back-to-back diodes connected between said output terminal of said flip-flop circuit and the inputs of said timing and integrating circuit means.
Claim 6
Dependent Claim
58 words
The tachometer circuit of claim 1 wherein said input circuit portion includes an input amplifier and a flip-flop stage each formed by similar operational amplifiers, and said input lockout means is connected between said input amplifier and said flip-flop stage to shunt that portion of said input pulse which exceeds the time duration of said given width pulse.
Claim 7
Dependent Claim
181 words
A tachometer circuit for use with a current source and including in combination: a current steering circuit having a first circuit portion connected to the current source, an input circuit portion for receiving periodic input pulses which are indicative of the motion of a movable member, and an output circuit portion into which current is alternately directed from the current source and diverted therefrom upon the application of said input pulses; timing circuit means connected to said output circuit portion and responsive to the leading edge of said input pulse to cause the start of a timing pulse when current is diverted from said output circuit portion and which terminates after a predetermined time interval; feedback means for applying said timing pulse to said current steering to revert its stAte to again cause current to be directed into said output circuit portion thus producing a given-width pulse at said output circuit portion; and integrating circuit means responsive to said given-width pulses to integrate the same and produce a tachometer reading corresponding to the number of said given-width pulses per unit time.
Claim 8
Dependent Claim
181 words
A tachometer circuit for use with a current source and including in combination: a current steering circuit having a first circuit portion connected to the current source, an input circuit portion for receiving periodic input pulses which are indicative of the motion of a movable member, and an output circuit portion into which current is alternately directed from the current source and diverted therefrom upon the application of said input pulses; timing circuit means connected to said output circuit portion and responsive to the leading edge of said input pulse to cause the start of a timing pulse when current is diverted from said output circuit portion and which terminates after a predetermined time interval; feedback means for applying said timing pulse to said current steering to revert its stAte to again cause current to be directed into said output circuit portion thus producing a given-width pulse at said output circuit portion; and integrating circuit means responsive to said given-width pulses to integrate the same and produce a tachometer reading corresponding to the number of said given-width pulses per unit time.
Claim 9
Dependent Claim
43 words
The tachometer circuit of claim 6 further including input lockout means connected to said input circuit portion and responsive to the termination of said timing pulse to shunt that portion of said input pulse which exceeds the time duration of said given-width pulse.
Claim 10
Dependent Claim
40 words
The tachometer circuit of claim 7 wherein said input lockout means includes a silicon controlled rectifier having the anode-cathode circuit thereof connected between said input circuit portion and ground potential and the gate circuit thereof connected to said feedback means.
Claim 11
Dependent Claim
27 words
The tachometer circuit of claim 6 further including a reference circuit means connected to said timing circuit means to set the time duration of said timing pulse.
Claim 12
Dependent Claim
161 words
A tachometer circuit comprising in combination, an input amplifier stage including a first operational amplifier for receiving input pulses of indiscriminate pulse width which are indicative of the motion of a moving member, a flip-flop circuit formed by a second operational amplifier, said flip-flop circuit having a first input connected to said input amplifier for changing its state of conduction during the initial rise time of a given input pulse, a comparator circuit formed by a third operational amplifier, said comparator connected to said flip-flop and providing a reference potential to produce a timing pulse output signal, a clamping circuit connected to said comparator to clamp the starting potential of said timing pulse to a predetermined voltage value, and to produce a given-width pulse in response to said timing pulse, and a pulse averaging circuit connected to said clamping circuit to receive said given-width pulse to produce a tachometer reading corresponding to the number of said given-width pulses per unit time.
Claim 13
Dependent Claim
161 words
A tachometer circuit comprising in combination, an input amplifier stage including a first operational amplifier for receiving input pulses of indiscriminate pulse width which are indicative of the motion of a moving member, a flip-flop circuit formed by a second operational amplifier, said flip-flop circuit having a first input connected to said input amplifier for changing its state of conduction during the initial rise time of a given input pulse, a comparator circuit formed by a third operational amplifier, said comparator connected to said flip-flop and providing a reference potential to produce a timing pulse output signal, a clamping circuit connected to said comparator to clamp the starting potential of said timing pulse to a predetermined voltage value, and to produce a given-width pulse in response to said timing pulse, and a pulse averaging circuit connected to said clamping circuit to receive said given-width pulse to produce a tachometer reading corresponding to the number of said given-width pulses per unit time.
Claim 14
Dependent Claim
29 words
The tachometer circuit of claim 10 wherein said comparator circuit and said clamping circuit receive an input signal over a common line connected to the output of said flip-flop.
Claim 15
Dependent Claim
39 words
The tachometer circuit of claim 10 wherein said flip-flop circuit includes a feedback path connected to a second input terminal thereof for resetting the same upon change of polarity from the timing pulse output signal of said comparator 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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |