GB2595570A

GB2595570A - Portable active temperature control apparatus

Info

Publication number: GB2595570A
Application number: GB2105230.3A
Authority: GB
Inventors: Hong MAK Kai; Wah Liu Man
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-15
Filing date: 2021-04-13
Publication date: 2021-12-01
Anticipated expiration: 2041-04-13
Also published as: GB202105230D0; JP3242274U; JP2021170530A; CN215268780U; GB2595570B; JP7183333B2; CN113543394A; DE202021101972U1; CN113543394B; JP2023015361A

Abstract

An active temperature control apparatus 100 comprises an insulating housing 10 provided with a main control unit 12, a vacuum insulation layer 20 and storage container 40 disposed in the insulating housing, a top cover 50, and a heating module 60. The heating module includes a conductive coil 62 which receives a high-frequency AC from the main control unit to continuously generate an alternating magnetic field, and a thermocouple connected to the conductive coil and the main control unit and which is used for feeding back a temperature to the main control unit to adjust an operating voltage to change the high-frequency AC. The alternating magnetic field generated by the conductive coil enables the metal of the vacuum heat insulation layer to generate heat and perform heat exchange with the storage container. The heating module may be provided between an inner insulating housing 30 and the vacuum insulation layer. The coil may be formed as a two-dimensional concentric circle, or as a three-dimensional symmetric shape.

Description

PORTABLE ACTIVE TEMPERATURE CONTROL APPARATUS Inventors: Kai Hong MAK, Man Wah LIU

Technical Field:

[0001] The present invention relates to a temperature control apparatus, and in particular, to an easily portable apparatus capable of active heating or thermal insulation.

Background:

[0002] A large variety of portable thermal insulation containers are currently available.

However, these thermal insulation containers have inadequate efficiency. According to the report (https://echoice.consumenorg.hldartiele/531-thermal-food-flasks) in Choice Magazine published by the Hong Kong Consumer Council on January 14, 2021, a safe storage temperature of hot foods needs to be greater than 60 degrees Celsius. If a thermal insulation container needs to keep a safe storage temperature at or above 60 degrees Celsius for a long time, an external alternating current (AC) electrical power supply is usually required for powered thermal insulation. This type of portable thermal insulation container consumes power and is bound to be used in a scenario where an AC electrical power outlet is available. Therefore, the currently available thermal insulation containers are not easily portable in practice.

Summary of the Invention:

[0003] To address the aforesaid deficiency, one of the objectives of the present invention is to provide a non-AC-driven active temperature control apparatus with low power consumption, environmental friendliness, high safety, and sustained thermal insulation.

[0004] In accordance to one embodiment of the present invention, the portable active temperature control apparatus includes an insulating housing, a vacuum heat insulation layer, a storage container, a top cover, and a heating module. The insulating housing is provided with a main control unit. The main control unit supplies a high-frequency AC.

The vacuum heat insulation layer is made of metal, and is disposed in the insulating housing. The storage container is disposed in the insulating housing. The top cover covers the insulating housing. The heating module is electrically connected to the main control unit. The heating module includes a conductive coil and a thermocouple. The conductive coil receives the high-frequency AC from the main control unit to continuously generate an alternating magnetic field. The thermocouple is connected to the conductive coil and the main control unit, and is used for feeding back a temperature for the main control unit to adjust an operating voltage to change the high-frequency AC. The alternating magnetic field generated by the conductive coil enables the metal of the vacuum heat insulation layer to generate heat and perform heat exchange with the storage container.

[0005] In accordance to one embodiment of the present invention, the portable active temperature control apparatus further includes an inner insulating housing, where the heating module is located between the inner insulating housing and the vacuum heat insulation layer.

[0006] In an implementation of the present invention, the insulating housing, the main control unit, the vacuum heat insulation layer, the inner insulating housing, and the heating module are disposed in a space of a closed system.

[0007] In accordance to one embodiment of the present invention, a shape design of the conductive coil includes a two-dimensional plane circular shape design.

[0008] In accordance to one embodiment of the present invention, a shape design of the conductive coil includes a three-dimensional symmetric shape design.

[0009] In accordance to one embodiment of the present invention, the conductive coil further includes a body portion and a plurality of protruding portions, these protruding portions being connected to the body portion, and standing on the body portion, these protruding portions being symmetrically disposed with respect to a central axis of the portable active temperature control apparatus.

[0010] In accordance to one embodiment of the present invention, the shape of the body portion includes a circular shape.

[0011] In accordance to one embodiment of the present invention, the shape of the protruding portion includes a rhombic shape, a circular shape, an hourglass shape, or a quadrilateral shape.

[0012] In accordance to one embodiment of the present invention, the main control unit is connected to an electrical power source, the main control unit includes a high-frequency AC/direct current (DC) electricity conversion circuit, and the high-frequency AC/DC conversion circuit is used for converting a DC from the electrical power source into the high-frequency AC.

[0013] In an implementation of the present invention, the electrical power source includes a mobile power supply, a USB power supply, or a battery embedded in the portable active temperature control apparatus.

[0014] As discussed above, in the portable active temperature control apparatus in the implementations of the present invention, the alternating magnetic field is generated between the metal in the vacuum heat insulation layer and the conductive coil to generate heat through electromagnetic induction, and the metal and the storage container perform heat exchange, to implement the heating or thermal insulation of contents in the storage container. The thermocouple feeds back a temperature to adjust heat generation power, to improve operational safety. In addition, the shape design of the conductive coil is a three-dimensional symmetric shape design, so that the heating uniformity of a heat generation region can be effectively improved. Moreover, the main control unit is provided with the high-frequency ACDC conversion circuit for converting a DC into the high-frequency AC. Therefore, the portable active temperature control apparatus in the implementation of the present invention is no longer bound to be used in a scenario where AC can be supplied, so that a user can conveniently carry the apparatus to various scenarios for heating or a requirement of sustained thermal insulation can be satisfied, to implement the portable active temperature control apparatus with low power consumption and high safety.

[0015] For the inventive contribution related to the present invention, although portable thermal insulation containers have been proposed in the technical means in the prior art, a cooling/heating component/system of a portable thermal insulation container does not have specific use and configuration provided for induction heating of the present invention. For example, for at least some technical features provided in this patent application: "a heating module, electrically connected to the main control unit, the heating module including: a conductive coil, receiving the high-frequency AC from the main control unit to continuously generate an alternating magnetic field; and a thermocouple, connected to the conductive coil and the main control unit, and used for feeding back a temperature for the main control unit to adjust an operating voltage to change the high-frequency AC, where the alternating magnetic field generated by the conductive coil enables the metal of the vacuum heat insulation layer to generate heat and perform heat exchange with the storage container", a technical effect achieved by the technical features is "the alternating magnetic field generated by the conductive coil enables the metal of the vacuum heat insulation layer to generate heat and perform heat exchange with the storage container". However, instead of inductive heat generation in the present invention, a heating filament, a resistive heater, or a thermoelectric system including one or more Peltier components is usually used in the technical means in the prior art. In terms of structure, induction heating is performed on the entire inner insulating housing or vacuum heat insulation layer in this patent application, whereas the cooling/heating component/system itself is heated/cooled in the technical means in the prior art and thermal energy is radiated or absorbed from the part. Therefore, compared with the technical means in the prior art, this patent application can provide the portable active temperature control apparatus with lower power consumption and higher safety.

Brief Description of the Drawings:

[0016] The aspects of the present invention will become more comprehensible from the following detailed description made with reference to the accompanying drawings. It should be noted that, various features may not be drawn to scale. Actually, the sizes of the various features may be increased or reduced arbitrarily for ease of description. [0017] The implementations of the present invention are described below further in detail with reference to the accompanying drawings: [0018] FIG. 1 is an exploded view of a portable active temperature control apparatus according to Embodiment 1 of the present invention; [0019] FIG. 2 is a partial schematic structural diagram of the portable active temperature control apparatus according to Embodiment I of the present invention; [0020] FIG. 3 is a diagram showing a two-dimensional conductive coil manufactured in a surrounding manner according to Embodiment I of the present invention; [0021] FIG. 4 is a temperature change graph under a heating condition of a portable active temperature control apparatus according to a comparative embodiment; [0022] FIG. 5 is a temperature change graph of Embodiment 1 of the present invention under the same heating condition in the comparative embodiment in FIG. 4; [0023] FIG. 6 is a temperature distribution diagram of a vacuum heat insulation layer measured by using an infrared thermometer according to Embodiment I of the present invention; [0024] FIG. 7 is an exploded view of a portable active temperature control apparatus according to Embodiment 2 of the present invention; [0025] FIG. 8 is a schematic developed diagram of different implementation aspects of a three-dimensional conductive coil according to Embodiment 2 of the present invention; [0026] FIG. 9 is a temperature distribution diagram of a vacuum heat insulation layer measured by using an infrared thermometer according to Embodiment 2 of the present invention; and [0027] FIG. 10 is a temperature distribution diagram of a vacuum heat insulation layer measured by using an infrared thermometer after a conventional resistive heating method is used for heating.

Detailed Description:

[0028] The embodiments of the present invention are described in detail below. However, it should be understood that many applicable concepts provided by the present invention may be implemented in a plurality of specific environments. The described specific embodiments are only illustrative and do not limit the scope of the present invention.

[0029] In the spatial description, terms such as "up", "down", "above", "left side", "right side", "below", "top", "bottom", "vertical", "horizontal", "side", "relatively high", "relatively low", "upper", "on", and "under" are defined by a plane of a component or a group formed by components. The orientation of a component may be shown in a diagram corresponding to the component. It should be understood that the spatial description used herein are merely used for description, and the manifestation of the described structure in practice may be arranged in the space in any direction or manner. [0030] In the following description, several preferred examples are used to describe a portable active temperature control apparatus. It is comprehensible to a person skilled in the art that modifications including addition and/or replacement may be made without departing from the scope and spirit of the present invention. Specific details may be omitted for clarity. However, the embodiments of the present invention are to enable a person skilled in the art to implement the teachings of the embodiments of the present invention without undue experiments.

[0031] Referring to FIG. 1 and FIG. 2, in Embodiment 1 of the present invention, a portable active temperature control apparatus 100 includes an insulating housing 10, a vacuum heat insulation layer 20, an inner insulating housing 30, a storage container 40, a top cover 50, and a heating module 60.

[0032] The insulating housing 10 is provided with a main control unit 12. The main control unit 12 is connected to an electrical power source (not shown). The electrical power source is, for example, used for supplying a DC. The main control unit 12 is provided with a high-frequency AC/DC conversion circuit, and is suitable for receiving the DC from the electrical power source, and the high-frequency AC/DC conversion circuit converts the DC into a high-frequency AC. In some embodiments, the electrical power source may be, for example, an external power supply or an internal power supply.

The external power supply is, for example, an external mobile power supply or USB power supply, and the internal power supply is, for example, a battery embedded in the portable active temperature control apparatus 100. However, the present invention is not limited thereto. The material of the insulating housing 10 is, for example, an insulating material.

[0033] The vacuum heat insulation layer 20 is made of metal, and is disposed in the insulating housing 10.

[0034] The inner insulating housing 30 is disposed in the vacuum heat insulation layer 20. The material of the inner insulating housing 30 is, for example, an insulating material. The inner insulating housing 30 mainly covers a conductive coil of the heating module 60, and is not one of the major heating or thermal insulation structures.

[0035] The storage container 40 is disposed in the inner insulating housing 30, and the storage container 40 is used for accommodating contents (not shown). The contents may be liquid, solid food or other different substances to be accommodated. The present invention is not limited thereto.

[0036] The top cover 50 covers the insulating housing 10, and is used for isolating the contents in the storage container 40 from outside.

[0037] The heating module 60 is disposed between the inner insulating housing 30 and the vacuum heat insulation layer 20 (as shown in FIG. 1) and is electrically connected to the main control unit 12 (as shown in FIG. 2). The heating module 60 includes the conductive coil 62 and a thermocouple 64. Referring to FIG. 1 and FIG. 3, in Embodiment 1 of the present invention, a shape design of the conductive coil 62 includes a two-dimensional plane circular shape design. Specifically, the conductive coil 62 is formed by conductive wires in a concentric surrounding manner. As shown in FIG. 2 and FIG. 3, after the diameter, an electrical wire diameter, and the number of turns of the conductive coil 62 are calculated (set at the main control unit 12), the conductive coil 62 receives the high-frequency AC from the main control unit 12 to continuously generate a constantly changing alternating magnetic field. The alternating magnetic field enables the metal of the vacuum heat insulation layer 20 to generate heat. [0038] In another aspect, the thermocouple 64 is connected to the conductive coil 62 and the main control unit 12, and is used for feeding back a temperature for the main control unit 12 to adjust an operating voltage to change the high-frequency AC in the conductive coil, to implement temperature control. In some embodiments, the operating voltage of the main control unit 12 falls within a range of 3 volts to 12 volts. The high-frequency AC falls within a range of 1 ampere to 3.5 amperes. The power consumption of the output of the entire main control unit 12 can be controlled within a range below 30 watts.

[0039] Because the conductive coil 62 is disposed between the vacuum heat insulation layer 20, the thermocouple 64, and the inner insulating housing 30, by means of the principle of electromagnetic induction heating, the metal of the vacuum heat insulation layer 20 can interact with the alternating magnetic field generated by the conductive coil 62 to generate thermal energy. With the thermal energy, heat exchange can be effectively performed with the storage container 40, to assist in improving the heating or thermal insulation of the contents in the storage container 40, to implement low power consumption, low voltage, low current, and highly safe temperature control even without using active heat dissipation.

[0040] Moreover, the insulating housing 10, the main control unit 12, the vacuum heat insulation layer 20, the inner insulating housing 30, and the heating module 60 can be disposed in a space of a dosed system, to implement a waterproof function.

[0041] To describe the technical effects of Embodiment I of the present invention more clearly, a comparative embodiment is provided herein. The portable active temperature control apparatus in the comparative embodiment is approximately similar to the portable active temperature control apparatus 100 in FIG. 1, and a major difference lies in that the portable active temperature control apparatus in the comparative embodiment is not provided with the vacuum heat insulation layer 20 shown in FIG. 1.

[0042] As shown in FIG. 4, when the comparative embodiment is in an environment with a power supply of 8 watts, it generally takes 3 hours to reach a heat balance temperature (for example, approximately, 50 degrees). In FIG. 5, in the same environment with a power supply of 8 watts, in the embodiment in FIG. 1, it generally takes I to 2 hours to reach a heat balance temperature (for example, approximately 90 degrees). It can be seen that, under the same heating condition, the heating speed in the comparative embodiment is not high, and a high temperature cannot be reached. In the embodiment in FIG. 1, because the extent of heat loss is relatively small, the heating speed is high, and an environment with a relatively high temperature can be maintained. [0043] FIG. 6 is a temperature distribution diagram of a vacuum heat insulation layer measured by using an infrared thermometer according to Embodiment 1 of the present invention. As can be seen from FIG. 6, a temperature difference is relatively large between the bottom and a relatively upper position of the vacuum heat insulation layer, indicating that heating is not very uniform.

[0044] Referring to FIG. 7 and FIG. 8, FIG. 7 is a schematic structural exploded view of a portable active temperature control apparatus according to Embodiment 2 of the present invention. FIG. 8 is a schematic developed diagram of different implementation aspects of a three-dimensional conductive coil according to Embodiment 2 of the present invention.

[0045] As shown in FIG. 7, in Embodiment 2 of the present invention, a portable active temperature control apparatus 100' is approximately similar to the portable active temperature control apparatus 100 shown in FIG. 1. A major difference lies in that the portable active temperature control apparatus 100' includes the insulating housing 10, the vacuum heat insulation layer 20, the storage container 40, the top cover 50, a heating module 60', and a conductive coil 62' with a design in FIG. 8(a). The conductive coil 62' is used in place of the inner insulating housing 30 and the conductive coil 62 (60) in FIG. 1. In addition, an exterior design of the conductive coil 62' is different from an exterior design of the conductive coil 62 in FIG. 1 and FIG. 3.

[0046] Specifically, a shape design of the conductive coil 62' includes a three-dimensional symmetric shape design. Referring to FIG. 7, the conductive coil 62' includes a body portion 62a' and a plurality of protruding portions 62b'. These protruding portions 62b' are connected and stand on the body portion 62a' (as shown in FIG. 7). These protruding portions 62b' are symmetrically disposed with respect to a central axis I of the portable active temperature control apparatus 100'. The body portion 62a' is disposed at the bottom of the vacuum heat insulation layer 20, and has a two-dimensional plane circular shape design. These protruding portions 62b' are disposed along an inner surface of the vacuum heat insulation layer 20. With this configuration, an electromagnetic induction heating region on the vacuum heat insulation layer 20 is distributed more widely.

[0047] Further, in the implementation aspects as shown in FIG. 7 and FIG. 8(a), the shape of the protruding portion 62b' is a rhombic shape. In another embodiment, the shape of the protruding portion 62b' of the conductive coil 62' in FIG. 7 is a circular shape shown in FIG. 8(b). In an embodiment, the shape of the protruding portion 62b' of the conductive coil 62' in FIG. 7 is an hourglass shape shown in FIG. 8(c). In still another embodiment, the shape of the protruding portion 62b' of the conductive coil 62' in FIG. 7 is a quadrilateral shape shown in FIG. 8(d), and is, for example, a trapezoidal shape. The present invention is not limited thereto. In other implementation aspects that are not shown, the protruding portion 62b' may be in different shape designs. The present invention is not limited thereto. The conductive coil 62' having a three-dimensional symmetric shape design is not limited to the shape of the vacuum heat insulation layer 20. The foregoing protruding portion 62b' with a different shape is used to control a heat generation range around the protruding portion 62b', to enable the conductive coil 62' to further implement temperature distribution in different regions in the vacuum heat insulation layer 20, to further optimize the heating effect. The present invention is not limited thereto.

[0048] FIG. 9 is a temperature distribution diagram of a vacuum heat insulation layer according to Embodiment 2 of the present invention. In an environment with a power supply of 8 watts, an infrared thermometer is used to detect temperature at different positions of metal in the vacuum heat insulation layer 20 in FIG. 7, as shown in FIG. 9, temperature differences between the bottom, middle, and high layers are within 12 degrees Celsius. In the vacuum heat insulation layer 20 in Embodiment 1 of the present invention in FIG. 6, temperature differences between the bottom, middle, and high layers are approximately 20 degrees Celsius. Since the conductive coil 62' of the portable active temperature control apparatus 100 uses a three-dimensional symmetric shape design, heat balance generated by the conductive coil 62' for the metal of the vacuum heat insulation layer 20 is effectively improved, and nearly consistent temperatures can be reached at the positions of the bottom, middle, and high layers. [0049] In addition, the conductive coil 62' is changed from a two-dimensional plane circular design shown in FIG. 3 into a three-dimensional symmetric design as shown in FIG. 7. Such a design has not been reported. It should be noted that if the conductive coil 62 is changed from a two-dimensional plane circular design into a three-dimensional circular design, required power consumption is very high and may exceed a range of 12 watts. In another aspect, if the design as shown in FIG. 3 is changed into a three-dimensional circular design, compared with the design as shown in FIG. 8, conductive wire materials consumption may be increased by more than 30%. Moreover, in the design as shown in FIG. 8(a) and FIG. 7, the conductive wire materials start from an inlet to wind around the bottom of the metal of the vacuum heat insulation layer 20 and nearby and may leave from the same planar position (as shown by the dotted line in FIG. 7), to reduce the space for hiding wires and facilitate the connection with the main control unit 12.

[0050] To prove the advantages of the electromagnetic induction heating used in the present invention over existing resistive heating, FIG. 10 is a temperature distribution diagram of a vacuum heat insulation layer measured by using an infrared thermometer after a conventional resistive heating method is used for heating. After measurement, FIG. 10 shows that heat generated by the metal of the vacuum heat insulation layer 20 is not uniform, and it is found that a temperature difference in the metal of the vacuum heat insulation layer 20 is above 30 degrees Celsius. In other words, the vacuum heat insulation layer has very nonuniform heating temperatures at different positions, and the required power consumption is also relatively high. In FIG. 9, compared with the resistive heating method in FIG. 10, in the embodiment in FIG. 2, the vacuum heat insulation layer is uniformly heated and has relatively low power consumption.

[0051] In summary, in the embodiments of the present invention, the portable active temperature control apparatus supplies a high-frequency AC to be applied to a conductive coil to enable the conductive coil to generate an alternating magnetic field, the alternating magnetic field further interacts with metal of a vacuum heat insulation layer to generate thermal energy, and heat exchange of thermal energy can be effectively implemented with a storage container, to implement heating or thermal insulation of contents in the storage container. In addition, a thermocouple feeds back a temperature to enable a main control unit to adjust the magnitude of a current to further adjust heat generation power. In the embodiments of the present invention, a three-dimensional symmetric conductive coil design is further proposed, to further optimize the uniformity of heat generation. Moreover, the main control unit is provided with a high-frequency AC/DC conversion circuit, so that a DC can be converted into the high-frequency AC. Therefore, the present invention is no longer bound to be used in a scenario where AC can be supplied, so that a user can conveniently carry the apparatus to various scenarios for heating or a requirement of sustained thermal insulation can be satisfied, to implement the portable active temperature control apparatus with low power consumption and high safety.

[0052] The implementations selected and described above are used to clearly describe the principle and actual application of the embodiments of the present invention. Other persons skilled in the art can appreciate various implementations of the embodiments of the present invention and various modifications suitable for specific purpose.

[0053] The above-described embodiments of the present invention are for illustration of the principle and concept of the present invention, and are not intended to be exhaustive or limiting the present invention to the details described therein. A person skilled in the art should appreciate that various modifications and replacements with equivalents may be made without departing from the spirit and scope of the present invention defined in the appended claims. The accompanying drawings are not necessarily drawn to scale. Due to the factors of manufacturing process and tolerances, there may be differences between the processes presented in the embodiments of the present invention and an actual apparatus. Other implementations of the embodiments of the present invention may be not described in details. The description and the accompanying drawings should be considered as descriptive rather than limitative. Modifications may be made to adapt a particular situation, material, composition of matter, method, or process to the objective, spirit, and scope of the present invention.

All these modifications fall within the scope of the appended claims of the specification.

Although the methods disclosed herein are described by performing specific operations in specific orders. However, it should be understood that these operations may be combined, subdivided or rearranged to form equivalent methods, and this does not depart from the teachings of the present invention. Therefore, unless otherwise indicated, the orders and groups of these operations are not limited.

Claims

Claims: What is claimed is: 1. A portable active temperature control apparatus, comprising: an insulating housing, provided with a main control unit, wherein the main control unit supplies a high-frequency AC; a vacuum heat insulation layer, made of metal, and disposed in the insulating housing; a storage container, disposed in the insulating housing; a top cover, covering the insulating housing; and a heating module, electrically connected to the main control unit, the heating module comprising: a conductive coil, receiving the high-frequency AC from the main control unit to continuously generate an alternating magnetic field: and a thermocouple, connected to the conductive coil and the main control unit, and used for feeding back a temperature for the main control unit to adjust an operating voltage to change the high-frequency AC; wherein the alternating magnetic field generated by the conductive coil enables the metal of the vacuum heat insulation layer to generate heat and perform heat exchange with the storage container.
2. The portable active temperature control apparatus according to claim 1, further comprising an inner insulating housing, wherein the heating module is located between the inner insulating housing and the vacuum heat insulation layer.
3. The portable active temperature control apparatus according to claim 2, wherein the insulating housing, the main control unit, the vacuum heat insulation layer, the inner insulating housing, and the heating module are disposed in a space of a closed system.
4. The portable active temperature control apparatus according to claim 1, wherein a shape design of the conductive coil comprises a two-dimensional plane circular shape design.
5. The portable active temperature control apparatus according to claim 4, wherein the conductive coil is formed by conductive wires in a concentric surrounding manner.
6. The portable active temperature control apparatus according to claim I, wherein a shape design of the conductive coil comprises a three-dimensional symmetric shape design.
7. The portable active temperature control apparatus according to claim 6, wherein the conductive coil further comprises: a body portion; and a plurality of protruding portions, connected to the body portion, and standing on the body portion, the plurality of protruding portions being symmetrically disposed with respect to a central axis of the portable active temperature control apparatus.
8. The portable active temperature control apparatus according to claim 7, wherein the shape of the body portion comprises a circular shape.
9. The portable active temperature control apparatus according to claim 7, wherein the shape of the protruding portion comprises a rhombic shape, a circular shape, an hourglass shape, or a quadrilateral shape.
10. The portable active temperature control apparatus according to claim 7, wherein the body portion is disposed at a bottom of the vacuum heat insulation layer.
II. The portable active temperature control apparatus according to claim 7, wherein the protruding portions are disposed along an inner surface of the vacuum heat insulation layer.
12. The portable active temperature control apparatus according to claim 1, wherein the main control unit is connected to an electrical power source, the main control unit comprises a high-frequency AC/DC conversion circuit, and the high-frequency AC/DC conversion circuit is used for converting a DC from the electrical power source into the high-frequency AC.
13. The portable active temperature control apparatus according to claim 12, wherein the electrical power source comprises a mobile power supply, a USB power supply, or a battery embedded in the portable active temperature control apparatus.
14. The portable active temperature control apparatus according to claim 1, wherein the operating voltage of the main control unit falls within a range of 3 volts to 12 volts.
15. The portable active temperature control apparatus according to claim 1, wherein the high-frequency AC falls within a range of 1 ampere to 3.5 amperes.