Triggering method for a thyristor switch
First Claim
1. A triggering method for triggering a thyristor switch containing a multiple number of thyristors encompassing a predetermined number of series connected thyristors and a series connected of a predetermined number of thyristors connected antiparallel to said predetermined number of series connected thyristors, said method comprising the steps of:
- generating an on-off signal for switching on the thyristor switch in the presence of the on-off signal and for switching off the thyristor switch in the absence of said on-off signal;
detecting the anode-cathode voltage present at said multiple number of thyristors;
defining a predetermined threshold value of said anode-cathode voltage and comparing the detected anode-cathode voltage with said predetermined threshold value of said anode-cathode voltage;
generating a trigger standby signal of a predetermined duration in the presence of (i) said on-off signal and (ii) an anode-cathode voltage in excess of said predetermined threshold value of said anode-cathode voltage at a preselected number of said multiple number of thyristors; and
triggering at least once said multiple number of thyristors by generating a triggering pulse during said predetermined duration of said trigger standby signal.
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Abstract
A triggering method for a thyristor switch which has at least two thyristors wired in series and a thyristor wired in antiparallel to each of these thyristors. The thyristor switch is triggered or cut off as a function of a specifiable on-off signal. At least a single triggering of a thyristor to be switched-on takes place at the earliest if a positive anode-cathode voltage is applied to it which exceeds a specifiable switch-on voltage limiting value. The method comprises generating a trigger standby signal if the on-off signal is in the switch-on condition and, with a specifiable minimum number of thyristors to be triggered wired in series, their anode-cathode voltage is greater than the specifiable switch-on voltage limiting value. At least a single triggering of each thyristor to be switched on takes place by means of a short-duration trigger pulse only during the duration of the trigger standby signal.
25 Citations
27 Claims
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1. A triggering method for triggering a thyristor switch containing a multiple number of thyristors encompassing a predetermined number of series connected thyristors and a series connected of a predetermined number of thyristors connected antiparallel to said predetermined number of series connected thyristors, said method comprising the steps of:
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generating an on-off signal for switching on the thyristor switch in the presence of the on-off signal and for switching off the thyristor switch in the absence of said on-off signal; detecting the anode-cathode voltage present at said multiple number of thyristors; defining a predetermined threshold value of said anode-cathode voltage and comparing the detected anode-cathode voltage with said predetermined threshold value of said anode-cathode voltage; generating a trigger standby signal of a predetermined duration in the presence of (i) said on-off signal and (ii) an anode-cathode voltage in excess of said predetermined threshold value of said anode-cathode voltage at a preselected number of said multiple number of thyristors; and triggering at least once said multiple number of thyristors by generating a triggering pulse during said predetermined duration of said trigger standby signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A triggering method for triggering a thyristor switch containing a multiple number of thyristors encompassing a predetermined number of series connected thyristors and a series connection of a predetermined number of thyristors connected antiparallel to said predetermined number of series connected thyristors, said method comprising the steps of:
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generating an on-off signal for switching on the thyristor switch in the presence of the on-off signal and for switching off the thyristor switch in the absence of said on-off signal; detecting the anode-cathode voltage present at said multiple number of thyristors; defining a predetermined threshold value of said anode-cathode voltage and comparing the detected anode-cathode voltage with said predetermined threshold value of said anode-cathode voltage; setting said predetermined threshold value of said anode-cathode voltage at greater than or equal to 30 volts; and generating a triggering pulse for triggering said multiple number of thyristors if said anode-cathode voltage in at least 30% of said multiple number of thyristors has as said anode-cathode voltage, a value in excess of said predetermined threshold value of said anode-cathode voltage. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification