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US 4,626,978 AGranted
Static power frequency converter
AssigneeSaphymo-Stel
InventorJean-Marie Thouvenin
Life of this patent
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Abstract
The static converter of the invention comprises a central processor (15) measuring the output voltage (TM3), the output current (TM4), the rectifier current (S) and the reverse bias time (8) of the thyristors of the switch (5). From this information it drives, through interfaces (17, 18, 20) the starting thyristors (6) comprising a series resonating circuit intitiating the oscillations of the parallel resonant load circuit (2,3).
Claims17
A static power frequency converter, comprising
- a rectifier (4) having an input and an output and including controlled semiconductors (TE1-TE6) with control electrodes;
- a switch (5) having an input and an output and including controlled semiconductors (TS1-TS4) with control electrodes;
- and inductor (10) connecting the output of the rectifier to the input of the switch;
- means for measuring (TM3, TM4, S, 8) a voltage output and a current output of the switch (5), and a current supplied by the rectifier (4) to the switch (5), and a reverse bias time of the controlled semiconductors of the switch (5);
- means for detecting (TM1, TM2) a zero crossover of a voltage supplied to the input of the rectifier;
- a processing circuit (19) connected to an output from the measuring means and from the detecting means;
- a digital computer central processor (15) connected to an output of said processing circuit, and having at least two outputs;
- and
- at least two interface circuits (17, 18) connecting one of said computer outputs to the control electrodes of the controlled semiconductors of said rectifier, and another of said computer outputs to the controlled electrodes of the controlled semiconductors of said switch (5).
6 more elements
Dependencies are inferred from the claim text.