Power supply utilizing a thyristor
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorKouichi Hyodo
Life of this patent
Estimating the term…
Abstract
In apparatus for supplying an electric power from a power source to a load through a thyristor, an ignition phase angle of which is controlled by a conduction control circuit through an ignition instruction generating circuit, there are provided a circuit for detecting voltage applied across the thyristor, another circuit for converting the detected voltage into a conduction completion phase angle, and still another circuit for displaying a conduction completion phase angle as well as the aforementioned ignition phase angle of the thyristor.
Claims7
In an apparatus for supplying electric power from an AC power source to a load through a thyristor, said apparatus comprising a detector for detecting the voltage of said AC power source, a detector for detecting the current flowing through the thyristor, an oscillator generating a train of pulses, a counter for counting the number of the pulses in said train of pulses in response to an output of said voltage detector, an ignition instruction control circuit responsive to an output of said current detector for delivering a digital output indicative of a required ignition phase angle of the thyristor, and a circuit connected to receive outputs of said counter and said control circuit for delivering an ignition pulse to said thyristor when said outputs coincide with each other, the improvement comprising:
- means for detecting the conducting state of said thyristor;
- means responsive to an output of said conducting state detecting means for detecting the phase angle of said electric power at which completion of conduction of said thyristor occurs;
- means responsive to the digital output of said control circuit and to an output of said phase angle detecting means for converting said outputs into signals indicative of an ignition phase angle and a conduction completion phase angle;
- and
- means for displaying said signals indicating said ignition phase angle and said conduction completion phase angle.
In an apparatus for supplying an electric power from an AC power source to a load through a thyristor, said apparatus comprising a detector for detecting the voltage of said AC power source, a detector for detecting the current flowing through the thyristor, an oscillator for generating a train of pulses, a first counter for counting the number of pulses in said train of pulses in response to an output of said voltage detector, an ignition instruction control circuit responsive to an output of said current detector for delivering a digital output indicative of a required ignition phase angle of the thyristor, and a circuit connected to receive outputs of said first counter and said control circuit for delivering an ignition pulse to said thyristor when said outputs coincide with each other, the improvement comprising:
- means for detecting the conducting state of said thyristor;
- a second counter responsive to the outputs of said ignition instruction control circuit and said conducting state detecting means for starting and stopping a counting operation of the number of pulses in said train of pulses generated from said oscillator, respectively;
- means responsive to an output of said second counter and to an output of said control circuit for converting the outputs into a signal indicative of an conductive period of the thyristor;
- and
- means for displaying said signal indicating said conductive period.
Dependencies are inferred from the claim text.