Constant current generator switching system for ship traffic signals

摘要

PPROBLEM TO BE SOLVED: To provide a switching system for a constant-current generator for shipping traffic control signal capable of compressing the time required to switch between two power supplies, regular one and a substitute thereof, and reducing burden in maintaining a light level. PSOLUTION: A commercial alternating current single-phase supply, a capacitor for supplying a constant current, and a primary side winding of an output transformer are serially connected. A plurality of input side switching taps for linearly changing the amplitude of constant alternating current occurring at a secondary side wiring of the output transformer include two constant current generators, regular one and a substitute thereof, provided at the primary side wiring of the output transformer, and a load circuit to which a plurality of lamps having electronic emission sources mounted therein are serially connected. The two constant current generators are serially connected such that the output constant alternating current will be in opposite phase and form a serial circuit while being connected to the load circuit. Each of the two constant while being current generators has a circuit contactor for short-circuiting an output end for separation it from a serial circuit. PCOPYRIGHT: (C)2010,JPO&INPIT