CONTROLLER AND HEATING WIRE CAPABLE OF PREVENTING GENERATION OF ELECTROMAGNETIC WAVES

• US 20060219701A1
• Filed: 10/14/2005
• Published: 10/05/2006
• Est. Priority Date: 04/01/2005
• Status: Active Grant

• Current Assignee: Jong-Jin Kil
• Original Assignee: Jong-Jin Kil
• Inventors: KIL, JONG-JIN
• Granted Patent: US 7,151,241 B2
• Time in Patent Office: Days
• US Class Current: 219/501
• CPC Class Codes: H05B 1/0205 using a fusible material
• CPC Class Codes: H05B 3/56 Heating cables

Abstract

The present invention relates, in general, to a temperature controller and heating cable used for electric heating bedding, such as an electric blanket, electric papered floor or electric fomentation device, or warmers and, more particularly, to a controller having a safety device, which can immediately shut off the supply of power when the disconnection, breakage or local overheating of a heating cable occurs while preventing the generation of an induced magnetic field and the leakage of an electric field, in warmers, such as simple bedding or fomentation devices that are operated by allowing a user to simply control a heating temperature to a high or low level without measuring the temperature of a separate heating cable. The controller, having a safety device, for blocking electromagnetic waves includes a switch unit, a heating current U-turn and detection unit, a fuse, and a cutting operation unit.

Claims

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;

a fuse; and

a cutting operation unit for cutting the fuse depending on the signal detected by the heating current U-turn and detection unit.

2. The controller according to claim 1, wherein the switch unit comprises:

an off contact point for shutting off power;

a high contact point for strongly heating the heating cable; and

a low contact point for relatively weakly heating the heating cable.

3. The controller according to claim 2, 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.

4. The controller according to claim 3, wherein:

the cutting operation unit comprises a silicon controlled rectifier and a heating resistor,

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,

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, and

the heating resistor cuts the fuse when heat is generated.

5. The controller according to claim 2, wherein the heating current U-turn and detection unit comprises:

a heating current U-turn unit including a U-turn rectifier 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.

6. The controller according to claim 5, wherein the heating current U-turn unit comprises a diode having an anode connected to both the first electrical heating wire and a cathode of the U-turn rectifier, and a cathode connected to both the second electrical heating wire and an anode of the U-turn rectifier.

7. The controller according to claim 5, wherein:

the cutting operation unit comprises a silicon controlled rectifier and a heating resistor,

the transistor of the U-turn current detection unit includes a base connected to both the U-turn rectifier and the first electrical heating wire, an emitter connected to both the U-turn rectifier and the second electrical heating wire, and a collector connected to a gate of the silicon controlled rectifier,

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, and

the heating resistor cuts the fuse when heat is generated.

8. The controller according to claim 2, wherein the heating current U-turn and detection unit comprises a solenoid for connecting an end of the first electrical heating wire to an end of the second electrical heating wire.

9. The controller according to claim 8, wherein the cutting operation unit comprises a lead switch operating depending on whether power of the solenoid is connected or disconnected.

10. The controller according to claim 9, wherein the cutting operation unit comprises a heating resistor, which is connected to the lead switch and cuts the fuse when heat is generated.

11. The controller according to claim 1, wherein:

the fuse is cut when overcurrent flows through the fuse, and

the switch unit comprises,

an off contact point for shutting off power,

a high contact point for strongly heating the heating cable, and

a low contact point for relatively weakly heating the heating cable.

12. The controller according to claim 11, 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.

13. The controller according to claim 12, wherein:

the cutting operation unit comprises a silicon controlled rectifier and a cutting rectifier,

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, and

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 cutting rectifier.

14. The controller according to claim 11, wherein the heating current U-turn and detection unit comprises:

a heating current U-turn unit including a U-turn rectifier 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.

15. The controller according to claim 14, wherein the heating current U-turn unit comprises a diode having an anode connected to both the first electrical heating wire and a cathode of the U-turn rectifier and a cathode connected to both the second electrical heating wire and an anode of the U-turn rectifier.

16. The controller according to claim 14, wherein:

the cutting operation unit comprises a silicon controlled rectifier and a cutting rectifier,

the transistor of the U-turn current detection unit includes a base connected to both the U-turn rectifier and the first electrical heating wire, an emitter connected to both the U-turn rectifier and the second electrical heating wire, and a collector connected to a gate of the silicon controlled rectifier, and

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 cutting rectifier.

17. The controller according to claim 11, wherein the heating current U-turn and detection unit comprises a solenoid for connecting an end of the first electrical heating wire to an end of the second electrical heating wire.

18. The controller according to claim 17, wherein the cutting operation unit comprises a lead switch operating depending on whether power of the solenoid is connected or disconnected.

19. The controller according to claim 18, wherein the cutting operation unit comprises a cutting rectifier, which is connected to the lead switch.

20. A heating cable for blocking electromagnetic waves, comprising:

a first electrical heating wire connected to a first terminal of a power source;

an insulating coating applied to the first electrical heating wire while covering the first electrical heating wire;

a second electrical heating wire wound around an outer circumferential surface of the insulating coating and provided with a first end connected to a second terminal of the power source; and

an external coating for covering the insulating coating and the second electrical heating wire.

21. The heating cable according to claim 20, wherein:

the external coating is made of a conductive synthetic resin material, and completely covers both the insulating coating and the second electrical heating wire to prevent the insulating coating and the second electrical heating wire from being externally exposed.

22. The heating cable according to claim 20, wherein the external coating comprises:

a conductive coating made of a conductive synthetic resin material; and

an insulating coating for covering an outside of the conductive coating.

23. The heating cable according to claim 20, wherein the second electrical heating wire is a lead wire wound around an outside of the insulating coating.

24. The heating cable according to claim 20, wherein the second electrical heating wire is formed in a shape of a metallic strip and is spirally wound around an outside of the insulating coating.

25. The heating cable according to claim 20, wherein the second electrical heating wire is formed in a shape of a metallic shielding element, and is wound around an outside of the insulating coating.

26. The heating cable according to claim 20, wherein:

an aluminum plate is wound around an outside of the insulating coating, and

the second electrical heating wire is wound around an outside of the aluminum plate.