POWER UNIT FOR ION SOURCE

PURPOSE:To control a surge voltage effectively and improve dielectric strength and reliability of a semiconductor switch by inserting in an output side of the semiconductor switch a diode fixing a negative voltage at an earth potential. CONSTITUTION:Ten GTO thyristors 1 each being a self-extinction...

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Bibliographische Detailangaben
Hauptverfasser:	SATO TADASHI, KUROSAWA TOMOE, OHATA KOKICHI, HASHIMOTO ISAO
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PURPOSE:To control a surge voltage effectively and improve dielectric strength and reliability of a semiconductor switch by inserting in an output side of the semiconductor switch a diode fixing a negative voltage at an earth potential. CONSTITUTION:Ten GTO thyristors 1 each being a self-extinction of arc-type semiconductor switching element are connected in series, a partial potential resistance and a by-pass diode 2 are connected in parallel with the thyristor 1 to constitute a high-voltage semiconductor switch 3 together with a thyristor- driving gate circuit. A current-limiting reactor 4 is connected to an output side of the high voltage semiconductor switch 3 and also to a high-voltage electrode of ion source. A surge voltage higher than an output voltage of DC power source is fixed at the output voltage of DC power source by a diode 2 arranged in parallel with the semiconductor switch 1. A surge voltage on the side more negative than an earth potential is fixed at the earth potential if a high voltage diode 5 is turned ON.