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Gating signal control for a phase-controlled rectifier circuit
| Details |
Inventors: Bailey, Ronald B.;
Assignee: General Electric Company (Erie, PA)
Primary Examiner: Beha, Jr.; William H.
Assistant Examiner:
Attorney, Agent or Firm: Beusse; James H.
A method and apparatus for controlling the phase retard time of a phase-controlled rectifier circuit in a power conversion system wherein a clock-pulse synchronized alternating voltage source is connected to supply power to the phase-controlled rectifier circuit. The clock pulses controlling the voltage source are detected and delayed for a predetermined time interval prior to their application to the voltage source. A ramp voltage generator synchronized to the clock pulses and a comparator circuit for comparing the ramp voltage signal level to a reference level provide a means for generating gate pulses to control the phase retard time of the phase-controlled rectifier circuit between maximum and minimum retard times. Maximum retard time is established at the occurrence of a clock pulse by applying a gating signal to the rectifier circuit if the rectifier circuit has not been triggered prior to detection of the clock pulse. Further gating signals are inhibited until the alternating voltage source has reversed polarity in response to the delayed clock pulses thus establishing a minimum retard time. The predetermined time interval between detection of the clock pulses and application of the delayed clock pulses to the alternating voltage source is selected to be at least sufficient to allow commutation and achievement of forward voltage blocking ability, by the components of the phase-controlled rectifier circuit. |
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DETAILED DESCRIPTION Referring to FIG.
1 there is illustrated one embodiment of the invention in simplified form as may be utilized in a control circuit for a DC electric motor.
A source of DC power, illustrated as a battery 10, has a negative terminal connected to the reference or negative bus 12 and has a positive terminal connecting through a power switch 14 to a positive bus 16.
A chopper 18, a motor armature 20, and a motor field winding 22 are serially connected between bus 16 and bus 12.
As is well known, the chopper is essentially a switch which is periodically opened and closed.
Control of the chopper is effected by a chopper control circuit 24 which supplies an ON gating signal to chopper 18 via line 26 and an OFF gating signal to chopper 18 via line 28.
The conduction duty cycle of chopper 18 can be controlled by time ratio control of the ON and OFF periods of the chopper.
Various types of and operating controls for chopper circuits are disclosed, for example, in the General Electric Company SCR Manual, Fifth Edition, Section 13.
2.
4 and in U.
S.
Pat.
No.
3,515,970 -- Weiser, issued June 2, 1970 and assigned to the General Electric Company.
For the purpose of describing the present invention it is sufficient to point out that the motor is energized by periodically operating the chopper 18 to allow current to flow from bus 16 through chopper 18, motor armature 20 and motor field winding 22 to bus 12.
During the initial stage of motor operation the voltage of battery 10 is sufficient to allow the motor to accelerate along a substantially flat torque-speed curve.
However, as motor velocity increases, the motor reverse electromotive force (back EMF) or armature generated voltage, increases to the point at which it equals the voltage of battery 10.
Below this velocity the motor supplies constant torque.
Once the back EMF begins to overcome battery voltage, motor current, and thus motor torque, attempts to decrease.
One method of operation above this velocity point is to operate the motor in a constant horsepower mode
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Fuel Cells 
