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Patent Searching and Data


Title:
POWER UNIT
Document Type and Number:
Japanese Patent JPH01114915
Kind Code:
A
Abstract:
PURPOSE:To prevent a capacitor from being excessively charged and overshot when a DC side turn off thyristor (GTO) is turned on again by shifting or blocking the phase of an AC control thyristor switch by an OFF command to the GTO. CONSTITUTION:In a normal operation mode for operating the AC control thyristor switch 3 in the ON state of the DC side GTO 7, an arithmetic circuit 15 outputs an input from a constant voltage control circuit 12 to a phase control circuit 13 as it is. At the time of inputting an operation command 54 from the switch 3 and an OFF command 53 to the GTO 7, the circuit 15 outputs a command for shifting the phase control angle of the switch 3 or blocking a gate to the circuit 13 to prevent the DC side capacitor from being excessively charged. Thereby, a waveform free from overshooting due to the excess charge of the capacitor can be obtained when the GTO 7 is turned on again.

Inventors:
WATANABE KAZUHIRO
ISHIDA NORIKO
Application Number:
JP27385887A
Publication Date:
May 08, 1989
Filing Date:
October 29, 1987
Export Citation:
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Assignee:
JAPAN ATOMIC ENERGY RES INST
TOSHIBA CORP
International Classes:
G05F1/56; G05F1/455; (IPC1-7): G05F1/455; G05F1/56