| 摘要 |
A current sensor assures the detection of a current flowing through a welder conductor without requiring a particular power source, and indicates the current state with the aid of a lamp. In one embodiment, a welder conductor penetrates a toroidal core across which connects a slider resistor whose sliding arm connects through a rectifier circuit, and a parallel circuit of a capacitor and a resistor, to a lamp. A second embodiment imterposed between the parallel circuit and lamp wherein a series circuit of a second resistor and a Zener diode, and a transistor base is connected to a connection point between the second resistor and a Zener diode, and the emitter-collector circuit of which transistor drives the lamp. A third embodiment adds a further series circuit of another lamp and resistor across the parallel circuit and across the series circuit of the second resistor and the Zener diode. Also, the collector of the transistor is connected to the control terminal of a thyristor, the cathode of which thyristor is connected to the output terminal of the rectifier circuit and to the anode of which thyristor the lamp is connected. The other end of which lamp connects to the other output terminal of said rectifier circuit.
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