US3671836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power conversion control system
Assignee: General Electric Co
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Filing: 1971-03-31
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Granted: 1972-06-20
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Expires: 1991-03-31
Abstract
Abstract A static power conversion system for converting alternating current electric power to direct current power by means of controllable rectifiers is provided with control apparatus for controlling the firing angle of the controlled rectifier. The control apparatus generates a command signal proportional to a desired level of direct current power output, internal signal trains at various frequencies and timings determined at least in part by the frequency of the alternating current input wave form and the magnitude of the command signal, and output trains of firing pulses for delivery to the controllable rectifiers, the timing of the firing pulses being determined by the magnitude of the control signal.
Inventors
- 👤 Edwin E Kolatorowicz
- 👤 Werner K Volkmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:16
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/162; H02M7/1623; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/293; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/915; Y10S388/917
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
391 words
In a static power conversion system for converting alternating current electric power to direct current electric power including at least one separately controlled load current carrying controllable rectifier for each phase of the alternating current electric power source, the level of direct current electric power output to a load being determined by the firing angle of the controllable rectifiers, control means for controlling the firing angle comprising: means for generating a command signal proportional to a desired level of direct current power output, means connected to the alternating current power input and being responsive thereto for generating a first train of signals at a frequency equal to the product of the frequency of the alternating current power input and the number of separately controlled rectifiers and for generating a plurality of channel signal trains of signals at the frequency of the alternating current power input, there being as many channel signal trains as there are separately controlled rectifiers, means connected to receive the command signal and said first train of signals and being responsive thereto for generating second and third trains of signals, the signals of said second train being generated at the same frequency as the signals of said first train and being offset in time relative to the signals of said first train by an amount proportional to the magnitude of said command signal and the signals of said third train being generated at the same frequency as the signals of said first and second trains and being offset in time relative to the signals of said second train by an additional amount proportional to the magnitude of said command signal, means connected to receive said channel signal trains and said second and third signal trains and being responsive thereto for directing a plurality of trains of firing pulses to said controllable rectifiers, each train of firing pulses being directed to a respecTive controllable rectifier at the frequency of a respective one of said channel signal trains and the firing pulses of said firing pulse trains being offset in time relative to the signals of said respective channel signal train by an amount determined by the amount of cumulative time offset of the signals of said second and third signal trains, whereby the level of direct current electric power output is determined by the magnitude of said command signal.
Claim 2
Dependent Claim
391 words
In a static power conversion system for converting alternating current electric power to direct current electric power including at least one separately controlled load current carrying controllable rectifier for each phase of the alternating current electric power source, the level of direct current electric power output to a load being determined by the firing angle of the controllable rectifiers, control means for controlling the firing angle comprising: means for generating a command signal proportional to a desired level of direct current power output, means connected to the alternating current power input and being responsive thereto for generating a first train of signals at a frequency equal to the product of the frequency of the alternating current power input and the number of separately controlled rectifiers and for generating a plurality of channel signal trains of signals at the frequency of the alternating current power input, there being as many channel signal trains as there are separately controlled rectifiers, means connected to receive the command signal and said first train of signals and being responsive thereto for generating second and third trains of signals, the signals of said second train being generated at the same frequency as the signals of said first train and being offset in time relative to the signals of said first train by an amount proportional to the magnitude of said command signal and the signals of said third train being generated at the same frequency as the signals of said first and second trains and being offset in time relative to the signals of said second train by an additional amount proportional to the magnitude of said command signal, means connected to receive said channel signal trains and said second and third signal trains and being responsive thereto for directing a plurality of trains of firing pulses to said controllable rectifiers, each train of firing pulses being directed to a respecTive controllable rectifier at the frequency of a respective one of said channel signal trains and the firing pulses of said firing pulse trains being offset in time relative to the signals of said respective channel signal train by an amount determined by the amount of cumulative time offset of the signals of said second and third signal trains, whereby the level of direct current electric power output is determined by the magnitude of said command signal.
Claim 3
Dependent Claim
240 words
Control means as defined by claim 1 wherein the signals of the channel signal trains are generated in predetermined synchronization with respective phases of the alternating current power source and wherein the first train of signals includes signals generated in synchronization with all signals of the channel signal trains, said means for receiving said channel signal trains and said second and third signal trains and for directing said trains of firing pulses to the separately controlled rectifiers further comprising: means responsive to said second and third signal trains for producing a fourth train of signals, the signals of said fourth train being generated at the same frequency as the signals of said first, second, and third trains and being offset in time relative to the signals of said first train and the corresponding signals of said channel signal trains by an amount equal to the cumulative time offset of the signals of said second and third signal trains, and a logic network, said logic network including a plurality of channel signal train input means each connected to receive a selected one of said trains of channel signals, a plurality of firing pulse output means each connected to deliver a train of firing pulses to a respective separately controlled rectifier, and fourth signal train input means, said logic network being responsive to the signals of said channel signal trains and said fourth signal train to produce the trains of firing pulses.
Claim 4
Dependent Claim
96 words
Control means as defined by claim 2 wherein said means responsive to the alternating current power input for generating a first train of signals and for generating a plurality of channel signal trains of signals in predetermined synchronization with respective phases of the alternating current power source further comprises means for discriminating between positive and negative portions of the wave form of the respective phases of the alternating current power source and for generating the signals in said channel signal trains during only one of the portions of the wave form to establish the predetermined synchronization.
Claim 5
Dependent Claim
51 words
Control means as defined in claim 1, wherein the offset in time of the signals of said second train relative to the signals of said first train, and the further offset in time of the signals of said third train relative to the signals of said second train are substantially equal.
Claim 6
Dependent Claim
69 words
Control means as defined in claim 4, wherein the cumulative offset in time of the signals of said third train relative to the signals of said first train may be adjusted over a range extending from 0 electrical degrees to 180 electrical degrees in response to variations in the magnitude of the command signal such that the firing angles of the controlled rectifiers are varied through 180 electrical degrees.
Claim 7
Dependent Claim
101 words
Control means as defined by claim 5 wherein said means for generating said second and third trains of signals further comprises means responsive to said first train of signals for generating a first train of ramp signals in synchronization with said first train of signals, means responsive to said first train of ramp signals and the command signal for generating said second train of signals and a second train of ramp signals in synchronization with said second train of signals, and means responsive to said second train of ramp signals and the command signal for generating said third train of signals.
Claim 8
Dependent Claim
360 words
In an adjustable speed d-c drive system including a d-c motor and at least one separately cOntrolled load current carrying controllable rectifier for each phase of an alternating current power source for converting alternating current electric power to direct current electric power for supply to the motor, the firing angle of the separately controlled controllable rectifiers establishing the operating speed of the d-c motor, motor control means comprising: means for generating a command signal proportional to a desired level of motor speed, means connected and responsive to the alternating current power input for generating multiple signals at frequencies related to the frequency of the alternating current power input, the multiple signals including a first train of signals at a frequency equal to the product of the frequency of the alternating current power input and the number of separately controlled controllable rectifiers and a plurality of trains of channel signals at the frequency of the alternating current power input, there being as many channel signal trains as there are separately controlled rectifiers, means connected to said command signal generating means and to said multiple signal generating means for receiving and being responsive to the command signal and the signals of said first train of signals for generating second and third trains of signals at the frequency of said first train of signals, the signals of said second and third trains of signals each shifted by a finite time element with respect to the signals of said first train of signals, the finite time element of each of said second and third trains being proportional to the magnitude of said command signal, and means connected to said multiple signal generating means and said second and third signal train generating means and responsive to said channel signals and the signals of said second and third trains of signals for directing trains of firing pulses to the controllable rectifiers at the frequency of respective ones of said trains of channel signals, the firing pulses being shifted relative to the respective channel signals by a finite time element equal to the total of the finite time elements of said second and third trains of signals.
Claim 9
Dependent Claim
360 words
In an adjustable speed d-c drive system including a d-c motor and at least one separately cOntrolled load current carrying controllable rectifier for each phase of an alternating current power source for converting alternating current electric power to direct current electric power for supply to the motor, the firing angle of the separately controlled controllable rectifiers establishing the operating speed of the d-c motor, motor control means comprising: means for generating a command signal proportional to a desired level of motor speed, means connected and responsive to the alternating current power input for generating multiple signals at frequencies related to the frequency of the alternating current power input, the multiple signals including a first train of signals at a frequency equal to the product of the frequency of the alternating current power input and the number of separately controlled controllable rectifiers and a plurality of trains of channel signals at the frequency of the alternating current power input, there being as many channel signal trains as there are separately controlled rectifiers, means connected to said command signal generating means and to said multiple signal generating means for receiving and being responsive to the command signal and the signals of said first train of signals for generating second and third trains of signals at the frequency of said first train of signals, the signals of said second and third trains of signals each shifted by a finite time element with respect to the signals of said first train of signals, the finite time element of each of said second and third trains being proportional to the magnitude of said command signal, and means connected to said multiple signal generating means and said second and third signal train generating means and responsive to said channel signals and the signals of said second and third trains of signals for directing trains of firing pulses to the controllable rectifiers at the frequency of respective ones of said trains of channel signals, the firing pulses being shifted relative to the respective channel signals by a finite time element equal to the total of the finite time elements of said second and third trains of signals.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |