Title:
EMERGENCY THREEEPHASE AC POWER SUPPLY
Document Type and Number:
Japanese Patent JPS5529290
Kind Code:
A
Abstract:
PURPOSE:To convert a battery power to three-phase alternating current in high reliability by providing 12-bit shift register operating with an oscillator and connecting the output of the shift register through a semconductor switching element to an output terminal. CONSTITUTION:A rectangular pulse from an oscillator O is applied as shift pulse to 12-bit shift registers IC2-IC4, and the output of the shift register IC3 is fed back through a NOR gate IC5 to the DATA 1 of the shift register IC2. There are also provided a switching element Tr8 connecting the output terminal R to ground when the output Q1 of the register IC2 is ''high'', a switching element Tr7 connecting the output terminal R to a DC power supply when the output Q7 of the register IC3 is ''high'', at the terminals S and T, respectively. Thus, the switching elements are driven on the basis of the output of the shift registers. Accordingly, it provides always constant phase difference to operate extremely accurately.
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Inventors:
KOISHI YOSHIHARU
Application Number:
JP10331078A
Publication Date:
March 01, 1980
Filing Date:
August 23, 1978
Export Citation:
Assignee:
NIPPON SHUTTER GIJUTSU KENKYUS
International Classes:
H02M7/493; (IPC1-7): H02M7/48