Patent ID: 7151241
Filing Date: 2006-12-19
Classification: H05B

Abstract:
1. A controller, having a safety device, for blocking electromagnetic waves, comprising: a switch unit connected to a heating cable that blocks electromagnetic waves and includes a first electrical heating wire and a second electrical heating wire, the switch unit determining whether to supply power; a heating current U-turn and detection unit for causing power input from the first electrical heating wire to make a U-turn to the second electrical heating wire and detecting a signal, wherein the heating current U-turn and detection unit comprises: a heating current U-turn unit including a U-turn resistor for connecting an end of the first electrical heating wire to an end of the second electrical heating wire; and a U-turn current detection unit including a transistor, wherein the transistor of the U-turn current detection unit includes a base connected to both the U-turn resistor and the first electrical heating wire, an emitter connected to both the U-turn resistor and the second electrical heating wire, and a collector connected to a gate of the silicon controlled rectifier; a fuse; and a cutting operation unit for culling the fuse depending on the signal detected by the heating current U-turn and detection unit, wherein the cutting operation unit comprises a silicon controlled rectifier and a heating resistor, wherein the silicon controlled rectifier of the cutting operation unit includes a cathode connected to the emitter of the transistor, and an anode connected to the heating resistor, wherein the heating resistor cuts the fuse when heat is generated.