US3605026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for providing a pulse train having a mean frequency proportional to a digital number
Assignee: Emerson Process Management Ltd
•
Filing: 1969-07-14
•
Granted: 1971-09-14
•
Expires: 1989-07-14
Abstract
Abstract The apparatus provides a series of output pulses having a mean frequency in accordance with a digital input; such pulses may be used for controlling power, e.g. discrete cycles or half cycles of AC power, fed to a load. The digital number is put in a recycling storage medium, e.g. a shift register or delay line and, in one arrangement, a gate is arranged to pass or not pass a pulse from a pulse train according to one selected digit in each cycle of the storage medium, each digit being selected, during a given time interval, for a number of times corresponding to the significance of the digit. With a shift register, it is more convenient to control the shifting by shift pulses such that each digit is put in an output stage, to control a gate, for a number of times in given time interval proportional to the significance of the digit.
Inventors
- 👤 Keith Romilly Roskrudge Bowden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:43
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/60; G06F7/68; H; H02; H02M; H02M1/00; H02M1/08; H02M1/083; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/257; H02M5/2573; H02M5/2576
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
156 words
Apparatus for providing a series of output pulses having a mean frequency in accordance with a digital input comprising a pulse generator supplying a series of pulses at a frequency at least as great as the maximum output frequency required, a recycling storage medium storing a digital number in serial form representing said digital input, said storage medium having an output to which each digit in turn is applied as the number is cycled through the storage medium, a gate controlling the feeding of pulses from said pulse generator to an output, and recycling control means controlling the recycling so that each digit is brought to said output of said storage medium for periods of time corresponding to the significance of the digit whereby the gate is controlled by each digit at said output from said storage medium for a number of periods which, in a given time interval, correspond to the significance of that digit.
Claim 2
Dependent Claim
156 words
Apparatus for providing a series of output pulses having a mean frequency in accordance with a digital input comprising a pulse generator supplying a series of pulses at a frequency at least as great as the maximum output frequency required, a recycling storage medium storing a digital number in serial form representing said digital input, said storage medium having an output to which each digit in turn is applied as the number is cycled through the storage medium, a gate controlling the feeding of pulses from said pulse generator to an output, and recycling control means controlling the recycling so that each digit is brought to said output of said storage medium for periods of time corresponding to the significance of the digit whereby the gate is controlled by each digit at said output from said storage medium for a number of periods which, in a given time interval, correspond to the significance of that digit.
Claim 3
Dependent Claim
76 words
Apparatus as claimed in claim 1 wherein said recycling storage medium is a shift register and wherein the gate is controlled according to the digit in a selected stage of the shift register and wherein shift pulses are applied to the shift register so that the various digits are put in said selected stage, to effect control of the gate, a number of times in said given time interval proportional to the significance of each digit.
Claim 4
Dependent Claim
42 words
Apparatus as claimed in claim 1 in combination with a load, an alternating power supply, a power circuit connecting said power supply to said load a controlled switch in said power circuit said controlled switch being operatively responsive to said output pulses.
Claim 5
Dependent Claim
57 words
Apparatus as claimed in claim 3 wherein said pulse generator comprises rectifier means rectifying said alternating power supply to provide pulses at a frequency twice that of the alternating supply and wherein said controlled switch is arranged to conduct for half a cycle of the alternating supply each time it is triggered by one of said pulses.
Claim 6
Dependent Claim
48 words
Apparatus as claimed in claim 3 wherein said pulse generator comprises rectifier means to rectify said alternating power supply and wherein said controlled switch is arranged to conduct for one cycle of the alternating supply each time it is triggered by a gated pulse from said pulse generator.
Claim 7
Dependent Claim
134 words
Apparatus for providing a series of output pulses having a mean frequenCy in accordance with a digital input comprising a pulse generator supplying a series of pulses at a frequency at least as great as the maximum output frequency required, a gate for controlling the feeding of pulses from the pulse generator to an output, a shift register into which said digital input is put, one stage of said shift register being arranged to control said gate in accordance with the binary digit in that stage and means for applying shift pulses to said shift register so that the various digits of said digital input are put in said one stage to control said gate for a number of periods which, in a given time interval, correspond to the significance of the respective digits.
Claim 8
Dependent Claim
134 words
Apparatus for providing a series of output pulses having a mean frequenCy in accordance with a digital input comprising a pulse generator supplying a series of pulses at a frequency at least as great as the maximum output frequency required, a gate for controlling the feeding of pulses from the pulse generator to an output, a shift register into which said digital input is put, one stage of said shift register being arranged to control said gate in accordance with the binary digit in that stage and means for applying shift pulses to said shift register so that the various digits of said digital input are put in said one stage to control said gate for a number of periods which, in a given time interval, correspond to the significance of the respective digits.
Claim 9
Dependent Claim
125 words
Apparatus as claimed in claim 6 wherein, to provide the necessary shift of the number in the shift register, there are provided a high frequency source generating shift pulses at a higher frequency than said pulse generator and arranged so that the total shift required in effected between successive pulses from said pulse generator, a binary divider giving noncoincident outputs of submultiples of the frequency of the main pulse generator in binary stages, a counter counting successive pulses fed to the shift register and comparator means comparing the output from said counter with the output from said binary divider to gate pulses from said high frequency pulse source as to provide the appropriate number of shift pulses after each pulse of the main pulse generator.
Claim 10
Dependent Claim
36 words
Apparatus as claimed in claim 7 and wherein said shift register has n-stages and wherein said high frequency pulse source has a frequency at least as great as n times the frequency of said pulse generator.
Claim 11
Dependent Claim
148 words
Apparatus for providing a series of output pulses having a mean frequency in accordance with a digital input comprising a pulse generator supplying a series of pulses at a frequency equal to the maximum output frequency required, a recycling shift register storing a digital number in serial form representing said input, said shift register having an output stage, means applying shift pulses to the shift register so that the various digits are put in said output stage for number of times in a given time interval corresponding to the significance of the respective digits, a gate controlling the feeding of pulses from said pulse generator to an output, and means responsive to the digit in said output stage controlling said gate so that the number of pulses fed to the output in said given time corresponds to the significance and magnitude of the digits in said shift register.
Claim 12
Dependent Claim
148 words
Apparatus for providing a series of output pulses having a mean frequency in accordance with a digital input comprising a pulse generator supplying a series of pulses at a frequency equal to the maximum output frequency required, a recycling shift register storing a digital number in serial form representing said input, said shift register having an output stage, means applying shift pulses to the shift register so that the various digits are put in said output stage for number of times in a given time interval corresponding to the significance of the respective digits, a gate controlling the feeding of pulses from said pulse generator to an output, and means responsive to the digit in said output stage controlling said gate so that the number of pulses fed to the output in said given time corresponds to the significance and magnitude of the digits in said shift register.
Claim 13
Dependent Claim
68 words
Apparatus as claimed in claim 9 wherein said means applying shift pulses to the shift register comprises a high-frequency generator, shift signal gating means gating the output from said high-frequency generator, and control means controlling the shift signal gating means at the frequency of the pulse generator output so that the shifting of the number in the shift register is effected after each pulse from the pulse generator.
Claim 14
Dependent Claim
74 words
Apparatus as claimed in claim 9 wherein said shift signal gating means comprises a divider and counter providing, in response to each alternate pulse from the pulse generator (e.g. the first, third, fifth etc.), shift pulses to put the next most significant digit in said output stage, and in response to each alternate one of the remaining pulses shift pulses to put the next most significant digit in said output stage and so on.
References Cited (Backward Citations)
US3277317A
Cited
US3504204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |