Abstract: The present invention provides a heating cable control system. The system is configured with an optical coupling circuit, a NTC break-off detection circuit, and a fourth comparator circuit. The optical coupling circuit has an input terminal, a first control terminal, and a second control terminal. The first and second control terminals are electrically connected to first terminals of a NTC resistive layer and a PTC resistive wire of the heating cable, respectively. A second terminal of the PTC detection circuit is electrically connected to a silicon-controlled switch circuit. A second terminal of the NTC resistive layer is electrically connected to a negative input terminal of the fourth comparator circuit through the NTC break-off detection circuit, and is compared against a third reference voltage circuit. As such, when the NTC resistive layer becomes open-circuited, the heating to the PTC resistive wire is stopped reliably, thereby enhancing usage safety.

Abstract: The present invention provides a heating cable control system. The system is configured with an optical coupling circuit, a NTC break-off detection circuit, and a fourth comparator circuit. The optical coupling circuit has an input terminal, a first control terminal, and a second control terminal. The first and second control terminals are electrically connected to first terminals of a NTC resistive layer and a PTC resistive wire of the heating cable, respectively. A second terminal of the PTC detection circuit is electrically connected to a silicon-controlled switch circuit. A second terminal of the NTC resistive layer is electrically connected to a negative input terminal of the fourth comparator circuit through the NTC break-off detection circuit, and is compared against a third reference voltage circuit. As such, when the NTC resistive layer becomes open-circuited, the heating to the PTC resistive wire is stopped reliably, thereby enhancing usage safety.

Abstract: The present invention provides an energy-saving heating pad comprising a pad member comprising a heating wire enclosed by at least one heat accumulation layer therein and a socket connected to the heating wire therein; a controller comprising a plug connected to the socket of the pad member and a power outlet plug therein. As the heating wire being enclosed by the heat accumulation layers provided inside the pad member, the user is able to heat up the heating wire for a certain period of time to allow fast heat conduction on the heat accumulation layer for heat accumulation and preservation. Furthermore, it allows portable uses with convenience once it is heated via the electrical plug for a certain period of time, which lessens the safety concern on having the human body being exposed under the electromagnetic waves generated and achieves the merit of being energy-saving altogether.

Abstract: The heating device mainly contains a dual-core heat cable and a control circuit. The dual-core heating cable mainly contains a core, a heating wire winding spirally around the core, a NTC (negative-temperature-coefficient) layer wrapping around the core and the heating wire, a PTC heating wire winding spirally around the NTC layer, and an insulating layer wrapping around the NTC layer and the PTC heating wire. The control circuit monitors the PTC heating wire's current for constant temperature control, and the leakage current through The NTC layer as a second over-temperature protection. As such, the heating device has a superior constant temperature effect and avoids the problem of burning down the heating cable. The heating device therefore has a longer operational life span.

Abstract: The heating device mainly contains a dual-core heat cable and a control circuit. The dual-core heating cable mainly contains a core, a heating wire winding spirally around the core, a NTC (negative-temperature-coefficient) layer wrapping around the core and the heating wire, a PTC heating wire winding spirally around the NTC layer, and an insulating layer wrapping around the NTC layer and the PTC heating wire. The control circuit monitors the PTC heating wire's current for constant temperature control, and the leakage current through The NTC layer as a second over-temperature protection. As such, the heating device has a superior constant temperature effect and avoids the problem of burning down the heating cable. The heating device therefore has a longer operational life span.

Abstract: A yogurt cultivator includes a heat insulative pan, a heat-resisting carrier plate mounted within the heat insulative pan, the heat-resisting carrier plate defining a plurality of cells for holding respectively a fermentation container that holds cow's milk and milk solids and bacteria for fermenting into yogurt, each cell having an annular inside flange, a plurality of heat conductive top plates and a plurality of electrically insulative bottom plates respectively mounted in the cells and fixedly fastened to the respective annular inside flanges at top and bottom sides, a plurality of ceramic heating plates respectively mounted in the cells within the respective annular inside flanges between the heat conductive top plates and the electrically insulative bottom plates and controlled to produce heat, and a transparent covering covered on the carrier plate.