CN221553472U - New graphene heating sheet - Google Patents

Abstract

The utility model provides a new type of graphene heating sheet. The new type of graphene heating sheet includes: an insulating heat-insulating base layer; a graphene coating layer; a copper foil circuit layer, located between the insulating heat-insulating base layer and the graphene coating layer, and used to electrically connect the graphene coating layer; and a constant temperature microcircuit module, which is electrically connected to the copper foil circuit layer, and controls the constant temperature operation of the graphene coating layer in a closed loop by switching the power-on state of the graphene coating layer, and the constant temperature microcircuit module includes a temperature sensor, which is used to measure the temperature value of the graphene coating layer and directly transmit the temperature measurement value to the temperature control IC of the constant temperature microcircuit module; wherein the constant temperature microcircuit module includes two power supply wires, which are used to connect to the power supply terminal of the main control circuit board, so as to energize the graphene coating layer. The utility model simplifies the product control system centralization and software complexity, while enhancing product stability and reliability.

Description

New graphene heating sheet

[Technical field]

The utility model relates to the technical field of electric heating, and more specifically, to a novel graphene heating sheet structure.

[Background technology]

The heating sheet in the prior art includes metal alloy heating element, ceramic heating element, carbon fiber heating element or graphene heating element. The heating element is powered to generate heat, thereby continuously releasing heat, keeping the human body or human body parts in a warm environment, and playing the role of keeping warm and physical therapy. Among them, the graphene heating element generally uses PET as a thermoplastic polyester engineering plastic as a substrate. On the substrate, through process processing (such as methane in a high temperature environment, carbon atoms are separated, and carbon atoms are precipitated on the substrate to form an incomplete graphene layer), these incomplete graphene layers have resistance due to the gaps in the middle. After the power supply is loaded, the resistance generates heat and emits far infrared rays (heat). The electric heat conversion efficiency is high, the heating and temperature control speed is fast, and the service life is long.

In the field of mass health massage consumer electronics products today, especially in the field of smart massage chairs and smart massage mattresses, which are still in the latent stage of the blue ocean market, the use of microcontroller units (MCU) chips as product intelligent control technology has become the only choice for all electronic R&D engineers engaged in mass health products. However, with the substantial increase in product volume (or area) and the increase in the number of objects controlled by MCU software, the pin resources and software system complexity on the MCU chip are overwhelmed, and sometimes even multi-core MCU system control architectures have to be considered. For example, in products such as smart massage chairs and smart massage mattresses, there is a need for constant temperature control of multi-zone graphene far-infrared heating pads.

Traditional small-volume massage products (such as eye masks, shoulder and neck massagers, etc.) have relatively simple functions and the MCU is very close to the controlled object (within 300mm in a straight line), so the MCU will not have a lot of chip pin resource pressure and high control software complexity, especially the electromagnetic compatibility in a strong electromagnetic interference environment. However, large-volume (large-area) health and massage products such as smart massage chairs and smart massage mattresses are completely different. If the traditional centralized control architecture is still used, then each additional graphene far-infrared hot compress area means adding 4 transmission wires to the product main control board, 2 of which are used for power supply and 2 for NTC temperature sensor (Negative Temperature Coefficient Sensor) measurement signal feedback.

If the product requirements of smart massage chairs and smart massage mattresses are defined as at least 3 graphene far-infrared heat-compression areas (in Chinese medicine meridian theory: upper, middle and lower), then at least 12 transmission wires are required, which is affordable for small-volume products (such as the difficulty of processing and labor costs of production line workers during mass production). However, for large-volume (large-area) products such as smart massage chairs and smart massage mattresses, it is necessary to consider how to simplify the complexity of the product system and reduce the comprehensive manufacturing costs during mass production at the beginning of product design, and at the same time, special emphasis is placed on how to ensure the product's MCU anti-electromagnetic interference capability in a strong electromagnetic interference environment.

For such large-volume products, how to find a core component, the heating element, that can both simplify the complexity of the product and enhance the stability and reliability of the product has become a technical problem that technical personnel in this field urgently need to solve.

[Utility Model Content]

In view of this, the utility model provides a new graphene-based heating sheet device to solve the above problems. One of the purposes of the utility model is to optimize the structure of the far-infrared graphene heating sheet, which is the core health treatment component of large-volume (large-area) products such as smart massage chairs and smart massage mattresses, simplify the complexity of the product circuit board, and realize the independent temperature control component management of each area.

According to an embodiment of the utility model, a novel graphene heating sheet 100 is provided, comprising: an insulating heat-insulating base layer 200; a graphene coating layer 220, which generates heat and produces far-infrared energy waves when powered on; a copper foil circuit layer 210, which is located between the insulating heat-insulating base layer 200 and the graphene coating layer 220 and is used to electrically connect the graphene coating layer 220; and a constant temperature microcircuit module 300, which is electrically connected to the copper foil circuit layer 210, and controls the constant temperature operation of the graphene coating layer 220 in a closed loop by switching the power-on state of the graphene coating layer 220, and the constant temperature microcircuit module 300 includes a temperature sensor, which is used to measure the temperature value of the graphene coating layer 220 and directly transmit the temperature measurement value to the temperature control IC of the constant temperature microcircuit module 300 360; wherein the constant temperature microcircuit module 300 comprises two power supply wires for connecting to the power supply terminals of the main control circuit board so as to energize the graphene coating layer 220 of the novel graphene heating sheet.

Furthermore, the microcircuit module 300 also includes: a temperature control IC 360, which is used to control the constant temperature operation of the graphene coating layer 220; a linear three-terminal voltage regulator IC 340, which is used to provide a stable operating voltage for the temperature control IC 360; an electric power output pad 380; and a driving power tube 350, which is used to be turned on or off according to the temperature measurement value of the graphene coating layer 220, thereby controlling whether the graphene coating layer 220 is powered on.

Furthermore, the on/off state of the driving power tube 350 is controlled by the temperature control IC 360 according to the temperature measurement value.

Furthermore, based on the comparison between the temperature measurement value and the constant temperature target value, the temperature control IC 360 adaptively switches the power-on state of the graphene coating layer 220 so that the graphene coating layer 220 keeps operating at the constant temperature target value.

Furthermore, the power output pad 380 of the constant temperature microcircuit module 300 is electrically connected to the electrode pad 211 of the copper foil circuit layer 210 by means of a copper rivet 370 and then riveted and soldered to secure them together.

Furthermore, the temperature sensor is a negative temperature coefficient resistance temperature sensor.

Furthermore, when the temperature measurement value of the graphene coating layer 220 is lower than the constant temperature target value, the driving power tube 350 is turned on, the graphene coating layer 220 is powered on and generates heat; when the temperature measurement value of the graphene coating layer 220 reaches the constant temperature target value, the driving power tube 350 is turned off, the graphene coating layer 220 is powered off and cooled.

Furthermore, the temperature sensing probe 330 of the temperature sensor is bonded to the graphene coating layer 220 via an insulating thermally conductive adhesive to measure the temperature value of the graphene coating layer 220 .

Furthermore, the copper foil circuit layer 210 is a hollow copper foil strip.

Furthermore, the graphene coating layer 220 includes a plurality of graphene coating layer blocks, which are sequentially laid on the copper foil circuit layer 210 to cover the copper foil strips of the copper foil circuit layer 210 .

Furthermore, the novel graphene heating sheet 100 also includes a protective film layer, which is located above the graphene coating layer 220 .

According to the embodiments of the utility model, the graphene-based heating sheet device and its manufacturing method simplify the product control system centralization and software complexity, reduce the mass production assembly labor cost, and enhance product stability and reliability. It is a valuable practical action for the pre-product development team (PDT) of the new product introduction (NPI) of enterprises in the field of large health electronic consumer product manufacturing.

【Brief Description of the Drawings】

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

FIG1 is a schematic diagram of an independent constant temperature hot compress component of a distributed temperature control system according to an embodiment of the utility model.

FIG. 2 is a schematic diagram of a thermostatically controlled microcircuit module according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a copper rivet and a power drive output pad of a thermostatically controlled microcircuit module according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of the copper foil circuit layer electrode pad and the NTC temperature sensor according to an embodiment of the present invention.

FIG5 is a schematic diagram of each layer of a graphene heating sheet according to an embodiment of the present utility model.

FIG6 is a schematic diagram of a power supply pad and a power output pad of a thermostatically controlled microcircuit module according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of a temperature control IC and copper rivets of a constant temperature control microcircuit module according to an embodiment of the present invention.

8(a)-8(b) are schematic diagrams of independent temperature control components according to an embodiment of the present invention.

Figure 9 (a)-(l) are structural schematic diagrams of the manufacturing process of the new graphene heating sheet according to an embodiment of the utility model.

[Specific implementation method]

The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention. In addition, the elements/components with the same or similar reference numerals used in the drawings and embodiments are used to represent the same or similar parts.

The terms "include", "including", "have", "contain", etc. used in this document are open-ended terms, which mean including but not limited to. The term "and/or" used in this document includes any or all combinations of the items mentioned.

It should also be noted that, in this article, relational terms such as first and second, etc. are used only to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the article or device comprising the element.

The utility model provides a novel application structure and manufacturing method of a heating sheet based on graphene. One of the purposes is to structurally integrate the far-infrared graphene heating sheet and the constant temperature control microcircuit module, which are the core health treatment components of large-volume (large-area) products such as smart massage chairs and smart massage mattresses, and abandon the solution in which the temperature sensor NTC measurement signal must be fed back to the product main control circuit board through two signal transmission lines and the MCU centrally performs software temperature closed-loop control, thereby canceling the temperature signal transmission line of each hot compress area of the system to zero, and each hot compress area can be independently controlled at a nearby constant temperature, thereby simplifying the product system concentration and system software complexity, enhancing the anti-interference ability of the electronic system of multi-area far-infrared hot compress products in a strong electromagnetic field interference environment, and fundamentally realizing the stability and reliability of the product.

The utility model provides a new application structure of a graphene-based heating sheet, which can realize a distributed constant temperature control system solution for the heating sheet. Referring to Figure 1, Figure 1 is a schematic diagram of an independent constant temperature hot compress component 100 (for example, a graphene-based heating sheet) of a distributed temperature control system according to an embodiment of the utility model. The structure may include: an insulating and heat-insulating base layer 200, a copper foil circuit layer 210 for electrically connecting a graphene coating layer, a far-infrared heat radiation graphene coating layer 220, and a microcircuit module 300 for constant temperature control of the graphene heating sheet. The number of blocks and the shape and size of the graphene coating layer 220 can vary accordingly due to the power supply voltage and power size. In some embodiments, the size of the insulating and heat-insulating base layer 200 can be 260mmx130mm, and the size of the microcircuit module 300 can be 24mm x 17mm x1mm (board thickness). It should be noted that the specific size can vary according to the needs of different products, and the relaxed size is given here as an example, not as a limitation to the utility model.

FIG5 is a schematic diagram of each layer of a graphene heating sheet according to an embodiment of the utility model. On the insulating base layer 200, a copper foil circuit layer 210 is laid, followed by a far-infrared graphene coating layer 220, wherein the copper foil circuit layer 210 includes two electrode pads 211 for electrically connecting to the power output pad 380 (see FIG3 ) of the thermostatically controlled microcircuit module 300. The graphene coating layer 220 is conductive, and when energized, the entire coating layer will generate heat and radiate far-infrared energy waves that have a good effect on the human body. The copper foil circuit layer 210 can be used to electrically connect the graphene coating layer 220, so that the graphene coating layer 220 is energized. The insulating thermally conductive base layer 200 carries the copper foil circuit layer 210 and the graphene coating layer 220, and has the functions of insulation and heat insulation. Specifically, its insulation function can prevent the copper foil circuit layer 210 and the graphene coating layer 220 from short-circuiting within the layer, and its heat insulation function can prevent heat from being conducted downward.

FIG2 is a schematic diagram of a constant temperature control microcircuit module according to an embodiment of the present invention. The microcircuit module 300 may include: a temperature control IC (integrated circuit) 360, a linear three-terminal voltage regulator IC 340 that provides a stable operating voltage for the temperature control IC 360, a matching electric power output driving power tube 350, an electric power output pad 380 (see FIG3), power supply wires 310 and 320, and a temperature sensor.

The temperature control IC 360 can be an MCU, or a dedicated constant temperature integrated circuit, or a linear integrated circuit containing a comparator and a trigger suitable for constant temperature control. The temperature control IC 360 can include an MCU and a dedicated temperature control chip and a linear IC with a circuit structure required for temperature control. In some embodiments, the temperature control IC 360 can use a domestic NE555 integrated circuit chip, which contains 2 comparators and 1 trigger, suitable for constant temperature control. The linear three-terminal voltage regulator IC 340 can be a linear three-terminal voltage regulator to provide a stable working voltage for the internal circuit of the constant temperature module. It can use the HT7550 chip. The electric power output drive power tube 350 is a power switch tube, and whether it is on or off can be determined by the temperature measurement value of the NTC temperature sensor. It can use AO3404. These components are all low-priced and can effectively reduce the cost of the constant temperature control microcircuit module 300.

The temperature sensor may be an NTC temperature sensor, for example, with a resistance of 10K, used for temperature measurement, and includes a temperature sensing probe 330 (see FIG4 ). FIG4 is a schematic diagram of the electrode pads of the copper foil circuit layer and the NTC temperature sensor of the embodiment of the utility model. The temperature sensing probe 330 of the NTC temperature sensor used for temperature measurement on the constant temperature control microcircuit module 300 may be closely attached to the graphene coating layer 220 through an insulating thermally conductive adhesive.

The power supply wires 310 and 320 of the thermostatic control microcircuit module 300 can be connected to the heating plate power supply terminals of the product main control circuit board over a long distance, such as the main control circuit board heating plate power supply terminals in the electrical control box of the smart massage mattress. For example, the transmission power of the power supply wires 310 and 320 can be 10W/12V, and the wire length is at least 2M. In this way, the measurement signal of the NTC temperature sensor on the far-infrared thermal radiation graphene heating plate no longer needs to be fed back to the MCU on the main control circuit board of the big health massage product through an additional transmission line for centralized software temperature closed-loop control. The new application structure of the far-infrared graphene heating plate of the utility model can be used as an independent constant temperature hot compress component of a distributed temperature control system.

Taking Figure 2 as an example, except for two power supply wires, the constant temperature microcircuit module 300 has no other connection with the main control circuit board MCU, for example, the temperature control IC 360, the voltage regulator IC 340, the drive power tube 350, and the temperature sensor have no connection with the main control circuit board MCU, that is, the graphene heating sheet integrated circuit element is only connected to the power supply terminal of the main control circuit board through two power supply wires 310 and 320, thereby reducing the required signal lines from the traditional 4 to 2. The MCU of the main control circuit board can be responsible for the system management and control of large health products, such as product human-computer interaction, massage air bag inflation and deflation control, many solenoid valve gas circuit on-off control, air pump work stop control, graphene far-infrared multi-zone hot compress control, and many service mode controls.

Refer to Figure 3, which is a schematic diagram of the copper rivet and the power drive output pad of the thermostatic control microcircuit module according to an embodiment of the utility model. The power output pad 380 of the thermostatic control microcircuit module 300 is electrically connected to the electrode pad 211 (see Figure 4) of the copper foil circuit layer 210 by riveting and then soldering, so that the graphene heating sheet is integrated with the thermostatic control microcircuit module 300 to realize independent temperature control componentization. The power output pad 380 is a double-sided metallized hole pad. The power output pad 380 and the electrode pad 211 are riveted and soldered with copper rivets 370 to ensure that the insulation and heat insulation base layer 200, the copper foil circuit layer 210 and the constant temperature microcircuit module 300 are tightly integrated into one, thereby ensuring that the total impedance of the following line sequence tends to zero under high current conditions: power output pad 380-copper rivet 370-electrode pad 211-copper foil circuit layer 210-graphene coating layer 220. The electrode pad 211 is the power input pad of the copper foil circuit layer 210, and is electrically connected to the power output double-sided metallized hole pad 380 of the constant temperature microcircuit module 300 through the copper rivet 370.

In some embodiments, the size of the power output pad 380 can be 7mm x 7mm (wherein the aperture is 3mm), the copper rivet 370 can be 3mm, and the size of the electrode pad 211 can be 7mm x 7mm (wherein the aperture is 3mm). It should be noted that the specific size can vary according to the needs of different products. The relaxed size is given here as an example, not as a limitation of the present invention. Figure 6 is a schematic diagram of the power supply pad and the power output pad of the constant temperature control microcircuit module according to an embodiment of the present invention. The power supply pad 390 can be connected to the power supply wires 310 and 320, and the power output pad 380 can be connected to the electrode pad 211 on the copper foil circuit layer 210. Figure 7 is a schematic diagram of the temperature control IC 360 and the copper rivet 370 of the constant temperature control microcircuit module according to an embodiment of the present invention.

FIG8 is a schematic diagram of independent temperature control components according to an embodiment of the utility model. The constant temperature microcircuit module 300 of FIG1 can be implemented by the integrated circuit U1 of FIG8, such as the integrated circuit of model NE555, wherein U1 can include two comparators and an RS trigger. When the temperature value of the graphene heating sheet 100 is lower than the target constant temperature value, the resistance value of the NTC 330 closely attached to it by the insulating thermal conductive adhesive will be greater than the resistance value at the constant temperature (for example, the NTC constant temperature intermediate value), so that the R2 and R1 series voltage divider values corresponding to the second and sixth pins of U1 are synchronously lower than the internal comparator threshold value of each pin. Since the second pin is connected to the reverse input terminal of the internal comparator (marked as "A comparator"), the "A comparator" outputs a high level, so that the internal RS trigger is set to a high level output (i.e., the third pin of U1), so that the Q1 field effect power tube is turned on, so that the graphene heating sheet starts to be powered on and heated. As the temperature gradually increases, the NTC The resistance value of 300 gradually decreases, and the voltage divider value of R2, R1 and NCT in series gradually increases. When the temperature of the graphene heating plate reaches the constant temperature target value, the voltage divider value of the 6th pin of U1 will be higher than the threshold value of the internal comparator (marked as "B comparator") of this pin. Since the 6th pin is connected to the same-direction input terminal of the "B comparator", the "B comparator" outputs a high level, so that the internal RS trigger is set to a low level (the 3rd pin of U1), so that the Q1 field effect power tube is turned off, and the temperature of the graphene heating plate begins to gradually drop. This cycle repeats so that the graphene heating plate remains in a constant temperature state. Since the 8th pin of the integrated circuit U1 is the chip power input pin, the voltage value of this pin must be highly accurate and stable so that the integrated circuit U1 chip can work accurately and stably. U2 is a linear three-terminal integrated voltage regulator with a fixed voltage output. As a dedicated integrated circuit for voltage regulation, it can convert the unfixed or unstable power supply line voltage into a high-precision and stable voltage and provide it to the integrated circuit U1.

FIG8(b) is a schematic diagram of the internal functions of an independent temperature control component integrated circuit U1 according to an embodiment of the present invention. FIG8(b) is only an illustrative example and should not be regarded as a display of the implementation method of U1. In this example, pin 1 is a ground terminal, which is usually connected to the common ground of the circuit. Pin 2 is a trigger point, which can trigger U1 (e.g., NE555) to start its time cycle. The upper edge voltage of the trigger signal must be greater than 2/3VCC, and the lower edge voltage must be lower than 1/3VCC. Pin 3 is an output terminal. When the time cycle starts, the output of U1 moves to a high potential that is 1.7v less than the power supply voltage, and returns to a low potential of about 0v at the end of the cycle. The maximum output current at the high potential is about 200mA. Pin 4 is a reset terminal. If a low logic potential is sent to this pin, the timer will be reset and the output will return to a low potential. It can be connected to a positive power supply or ignored. Pin 5 is a control terminal, which allows an external voltage to change the trigger and threshold voltages. When the timer works in a stable or oscillating mode, this pin can be used to change or adjust the output frequency. Pin 6 is the threshold terminal, which can reset the latch and make the output low. This action is initiated when the voltage of this pin moves from below 1/3VCC voltage to above 2/3VCC. Pin 7 is the discharge terminal, which has the same current output capability as the main output pin. When the output is ON, it is LOW, with low impedance to ground. When the output is OFF, it is HIGH, with high impedance to ground. Pin 8 is the power supply voltage terminal, and the supply voltage range can be 4.5V to 16V.

The NTC temperature sensor can be a resistor whose resistance value changes with temperature. Using this characteristic, in some embodiments, the principle of constant temperature control is: the NTC temperature sensor is placed close to the graphene coating layer, and the temperature gradient difference between the coating layer and the NTC temperature sensor is as close to zero as possible, so that the NTC temperature sensor can truly reflect the temperature change of the graphene coating layer, which requires the adhesive to have good thermal conductivity. Since the NTC temperature sensor belongs to the constant temperature control circuit (its operating voltage is usually low, such as 3-5V), and the operating voltage of the graphene coating layer is usually high (such as 12V-24V, or even higher), if the adhesive does not have good insulation performance, it is bound to be connected to the constant temperature control closed-loop input circuit. Once the connection occurs, it will break down the constant temperature control closed-loop input circuit. After the probe 330 of the NTC temperature sensor is tightly attached to the graphene coating layer 220, since the NTC temperature sensor is a negative temperature coefficient resistance temperature sensor, when the graphene coating layer 220 is powered on, it will generate heat and the resistance of the NTC temperature sensor will decrease. If the graphene coating layer 220 is powered off, the temperature will gradually drop, and the resistance of the NTC temperature sensor will increase.

The driving power tube 350 of FIG. 2 is a high-current power switch tube for the power output of the constant temperature microcircuit module 300. The power supply pad 390 can be connected to the power supply wires 310 and 320. In some embodiments, the power output path of the graphene heating sheet integrated circuit is: power supply wires 310 and 320-power supply pads 390-driving power tube 350-power output pads 380-copper rivets 370-electrode pads 211-copper foil circuit layer 210-graphene coating layer 220. The driving power tube 350 can be implemented by the Q1 field effect tube of FIG. 8, and whether the graphene coating layer 220 is energized is controlled by turning on or off the driving power tube Q1. Specifically, the power supply wires 310 and 320 are connected to the power supply terminals of the main control circuit board to provide the graphene coating layer 220 with the power energy required for heating, and the PCB board of the product main control circuit board supplies low voltage. When the driving power tube 350 is turned on, the power output pad 380 is energized, and the electrode pad 211 is electrically connected through the copper rivet 370, and the copper foil circuit layer 210 is successively energized, and then the graphene coating layer 220 is also energized by electrically connecting the copper foil circuit layer 210, so that the graphene coating layer 220 of the graphene heating sheet is energized and heated. It should be noted that the target constant temperature value in the embodiment can be a target constant temperature range, so that the graphene heating sheet can maintain operation within this target constant temperature range.

The NTC temperature sensor 330 includes a temperature sensing probe 330, which is tightly attached to the graphene coating layer 220 through an insulating thermally conductive adhesive. After the temperature value of the graphene coating layer 220 is measured by the temperature sensing probe 330, it can be directly input into the temperature control IC 360 of the constant temperature microcircuit module 300 for constant temperature closed-loop control, and there is no other path for control. Since the traditional method requires 4 wires, 2 of which are used to feedback the temperature measurement signal, and the embodiment of the utility model does not need to use these 2 feedback signal lines when performing constant temperature control, only 2 power supply wires are required to energize the graphene coating layer 220 to meet the needs of power-on heating. Therefore, the utility model can simplify the circuit, save signal lines, and realize independent temperature control components.

In addition, the temperature sensing probe 330 of the utility model transmits the temperature measurement value signal directly to the temperature control IC 360 of the constant temperature microcircuit module 300, thereby enhancing the anti-interference ability of the electronic system of the multi-zone far-infrared hot compress product in a strong electromagnetic field interference environment. In comparison, if the measurement signal of the NTC temperature sensor is transmitted to the traditional architecture of the product main control board MCU, and the main control board MCU must use the ADC port (analog/digital conversion input port) in order to well receive the temperature signal transmitted by the NTC temperature sensor, if the product is small in volume (that is, the straight-line distance between the NTC temperature sensor and the main control MCU is very close), then the induced electromotive force of the space electromagnetic wave on the NTC temperature sensor to MCU signal transmission line is still small, which is not enough to cover the temperature signal transmitted by the NTC temperature sensor. However, for large-volume products, since the straight-line distance between the NTC temperature sensor and the main control board MCU is far, the induced electromotive force value is very large, which will fully cover the temperature value measured by the NTC temperature sensor probe, so that the main control MCU cannot obtain the real temperature value of the graphene coating layer 220, and in this case, all the constant temperature control performed by the main control board MCU is wrong. In addition, if a large-volume product is in a strong electromagnetic field environment, the induced electromotive force voltage value is very high, and it is very likely to break through the gate of the field effect semiconductor device of the internal circuit of the temperature measurement access port of the main control board MCU (the gate is very fragile). When the NTC temperature sensors of each hot compress area are localized according to the embodiment of the utility model, the main control board MCU no longer has a long-distance signal line to transmit the temperature signal, and the induced electromotive force is completely eliminated.

According to an embodiment of the utility model, a new type of graphene heating sheet is provided, which can tightly integrate the copper foil circuit layer, the insulating and heat-insulating base layer and the constant temperature microcircuit module into one, and electrically connect them through copper rivets, so that the graphene heating sheet and the constant temperature microcircuit module form an integrated combination scene, realizing independent temperature control componentization. The novel graphene heating sheet comprises: an insulating and heat-insulating base layer 200; a graphene coating layer 220, which generates heat and produces far-infrared energy waves when powered on; a copper foil circuit layer 210, which is located between the insulating and heat-insulating base layer 200 and the graphene coating layer 220 and is used to electrically connect the graphene coating layer 220; and a constant temperature microcircuit module 300, which is electrically connected to the copper foil circuit layer 210 and controls the constant temperature operation of the graphene coating layer 220 in a closed loop by switching the power-on state of the graphene coating layer 220. The constant temperature microcircuit module 300 comprises a temperature sensor, which is used to measure the temperature value of the graphene coating layer 220 and directly transmit the temperature measurement value to the temperature control IC 360 of the constant temperature microcircuit module 300; wherein the constant temperature microcircuit module 300 comprises two power supply wires, which are used to be connected to the power supply terminal of the main control circuit board, so as to power on the graphene coating layer 220 of the novel graphene heating sheet.

Preferably, the constant temperature microcircuit module 300 also includes: the temperature control IC 360, used to control the constant temperature operation of the graphene coating layer 220; a linear three-terminal voltage regulator IC 340, used to provide a stable operating voltage for the temperature control IC 360; an electric power output pad 380; and a driving power tube 350, used to be turned on or off according to the temperature measurement value of the graphene coating layer 220, thereby controlling whether the graphene coating layer 220 is powered on.

Preferably, the on/off state of the driving power tube 350 is controlled by the temperature control IC 360 according to the temperature measurement value.

Preferably, the temperature control IC 360 adaptively switches the power-on state of the graphene coating layer 220 based on the comparison between the temperature measurement value and the constant temperature target value so that the graphene coating layer 220 keeps operating at the constant temperature target value.

Preferably, the power output pad 380 of the constant temperature microcircuit module 300 is electrically connected to the electrode pad 211 of the copper foil circuit layer 210 by means of a copper rivet 370 and then riveted and soldered to secure them together.

Preferably, the temperature sensor is a negative temperature coefficient resistance temperature sensor.

Preferably, when the temperature measurement value of the graphene coating layer 220 is lower than the constant temperature target value, the driving power tube 350 is turned on, the graphene coating layer 220 is powered on and generates heat; when the temperature measurement value of the graphene coating layer 220 reaches the constant temperature target value, the driving power tube 350 is turned off, the graphene coating layer 220 is powered off and cooled.

Preferably, the temperature sensing probe 330 of the temperature sensor is bonded to the graphene coating layer 220 via an insulating thermally conductive adhesive so as to measure the temperature value of the graphene coating layer 220 .

Preferably, the copper foil circuit layer 210 is a hollow copper foil strip.

Preferably, the graphene coating layer 220 includes a plurality of graphene coating layer blocks, which are sequentially laid on the copper foil circuit layer 210 to cover the copper foil strips of the copper foil circuit layer 210 .

Preferably, the novel graphene heating sheet may also include a protective film layer located above the graphene coating layer 220. As a protective film layer, the material is insulating, which can protect human skin from the pricking sensation of electric shock and also protect the graphene material from being worn by external contacts.

Figures 9(a)-(l) are structural schematic diagrams of the manufacturing process of the new graphene heating sheet according to an embodiment of the utility model. Figure 9(a) shows the insulating and heat-insulating base layer 200, the graphene coating layer 220, the copper foil circuit layer 210 and the constant temperature microcircuit module 300 provided for the structure of the new graphene heating sheet of the utility model. Figure 9(b) shows that a copper foil circuit layer 210 for electrically connecting the graphene coating layer 220 is provided on the insulating and heat-insulating base layer 200. Figures 9(c) to 9(e) show that the graphene coating layer 220 is laid on the copper foil circuit layer 210. Figure 9(f) shows that a protective film layer is laid on top of the graphene coating layer 220. The protective film layer can be used as a protective film layer, and its insulating material can protect the human skin from the pricking sensation of being electrocuted, and can also protect the graphene material from being worn by external contacts. Figures 9(g) to 9(i) show that the power output pad 380 of the constant temperature microcircuit module 300 is electrically connected to the electrode pad 211 of the copper foil circuit layer 210 by riveting and then soldering. The constant temperature microcircuit module 300 can be used to switch the power-on state of the graphene coating layer 220 to control the constant temperature operation of the graphene coating layer 220 in a closed loop.

After the above steps, a new graphene heating sheet structure in which the graphene heating sheet and the constant temperature micro-control circuit module are integrated into one is assembled, and the assembled graphene heating sheet integrated circuit is shown in Figure 9(j), Figure 9(k) and Figure 9(l), wherein Figure 9(j) is a schematic diagram of the new graphene heating sheet without a protective film layer, and Figure 9(k) is a schematic diagram of the new graphene heating sheet with a protective film layer.

The new heating sheet structure based on the utility model abandons the traditional control architecture that the NTC temperature measurement signal of each heating sheet area temperature sensor must be fed back to the product main control circuit board through 2 transmission lines for centralized software temperature closed-loop control by MCU. The graphene heating sheet in each area is controlled at a constant temperature nearby, so the required transmission lines can be reduced from 12 to 6, so that the NTC temperature measurement signal of each area does not need to travel an additional line of more than 2 meters, and the signal distance can be compressed to zero in large-volume products (for example, smart massage mattress products), thereby simplifying the product control system concentration and software complexity, reducing the cost of mass production assembly time, and enhancing product stability and reliability.

According to another embodiment of the utility model, a method for manufacturing a graphene heating sheet is provided. The method may include: providing an insulating and heat-insulating base layer 200; providing a copper foil circuit layer 210 for electrically connecting to a graphene coating layer 220; providing a microcircuit module 300 for constant temperature control of the graphene heating sheet; wherein, the electric power output pad 380 of the microcircuit module 300 is electrically connected to the electrode pad 211 of the copper foil circuit layer 210 by a copper rivet 370, riveted and then soldered together; the two power supply wires 310, 320 of the microcircuit module 300 are connected to the heating sheet power supply terminal of the main control circuit board. The method may also include: closely fitting the temperature sensor probe 330 of the temperature sensor in the microcircuit module 300 to the graphene coating layer 220 through an insulating thermally conductive adhesive for temperature measurement.

According to another embodiment of the utility model, a distributed temperature control system is provided, comprising: at least one new graphene heating sheet as described in the above embodiment, and a circuit main control board, which includes an MCU, wherein the heating sheet power supply terminal of the main control board is connected to the two power supply wires of the graphene heating sheet. By integrating the far-infrared graphene heating sheet and the constant temperature control microcircuit module in structure, the solution that the temperature sensor NTC measurement signal must be fed back to the product main control circuit board through two signal transmission lines in the traditional control architecture and the MCU is used to centrally perform software temperature closed-loop control is abandoned, so that the temperature signal transmission line of each hot compress area of the temperature control system is canceled to zero, and each hot compress area in multiple areas can be independently controlled at a constant temperature nearby, thereby simplifying the product system concentration and system software complexity, enhancing the anti-interference ability of the multi-area far-infrared hot compress product electronic system in a strong electromagnetic field interference environment, and fundamentally realizing the stability and reliability of the product.

Example 1. A graphene heating sheet 100, comprising:

Insulation base layer 200;

Graphene coating layer 220;

A copper foil circuit layer 210, used for electrically connecting the graphene coating layer 220; and

The microcircuit module 300 is used for controlling the graphene heating sheet 100 at a constant temperature.

Example 2. According to the graphene heating sheet described in Example 1, the microcircuit module 300 further includes:

Temperature control IC360;

A linear three-terminal voltage regulator IC 340 is used to provide a stable operating voltage for the temperature control IC 360;

A driving power tube 350 is used to match the electric power output;

Electrical power output pad 380;

two power supply wires 310, 320; and

The temperature sensor includes a temperature sensing probe 330 which is tightly attached to the graphene coating layer 220 via an insulating thermally conductive adhesive for temperature measurement.

Example 3. According to the graphene heating sheet described in Example 2, the two power supply wires 310, 320 are connected to the heating sheet power supply terminals of the main control circuit board.

Example 4. According to the graphene heating sheet described in Example 2 or Example 3, the power output pad 380 is electrically connected to the electrode pad 211 of the copper foil circuit layer 210 through a copper rivet 370, riveted and then soldered to fasten them together.

Example 5. A method for manufacturing a graphene heating sheet, comprising:

Providing an insulating and heat-insulating base layer 200;

Providing a copper foil circuit layer 210 for electrically connecting the graphene coating layer 220;

Providing a microcircuit module 300 for constant temperature control of the graphene heating sheet;

The power output pad 380 of the microcircuit module 300 is electrically connected to the electrode pad 211 of the copper foil circuit layer 210 by riveting and soldering through the copper rivet 370;

The two power supply wires 310 and 320 of the microcircuit module 300 are connected to the heating plate power supply terminals of the main control circuit board.

Example 6. The method according to Example 5 further includes: closely attaching the temperature sensing probe 330 of the temperature sensor in the microcircuit module 300 to the graphene coating layer 220 via an insulating thermally conductive adhesive for temperature measurement.

Example 7. A distributed temperature control system, comprising:

At least one graphene heating sheet according to any one of Examples 1 to 4; and

A circuit main control board includes an MCU, wherein a heating plate power supply terminal of the main control board is connected to two power supply wires of the graphene heating plate.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the various steps in the flowchart can be executed in an order different from the order shown, and the numbering of the steps in the method embodiment described above is only schematic and does not limit the execution order of the steps. In addition, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the utility model can be essentially or partly embodied in the form of a software product that contributes to the prior art, or all or part of the technical solution. The computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the utility model. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (11)

1. Novel graphene heating sheet is characterized by comprising:

An insulating base layer (200);

a graphene coating layer (220) that generates heat when energized to generate far infrared energy waves;

A copper foil circuit layer (210) located between the insulating and heat-insulating base layer (200) and the graphene coating layer (220) for electrically connecting the graphene coating layer (220); and

A constant temperature microcircuit module (300) electrically connected with the copper foil circuit layer (210) for closed-loop control of the constant temperature operation of the graphene coating layer (220) by switching the energizing state of the graphene coating layer (220), the constant temperature microcircuit module (300) comprising a temperature sensor for measuring the temperature value of the graphene coating layer (220) and directly transmitting the temperature measurement value to a temperature control IC (360) of the constant temperature microcircuit module (300);

The constant-temperature microcircuit module (300) comprises two power supply wires and a power supply terminal, wherein the power supply wires are used for being connected to a main control circuit board and used for electrifying the graphene coating layer (220) of the novel graphene heating sheet.

2. The novel graphene heat-generating sheet of claim 1, wherein the constant temperature microcircuit module (300) further comprises:

The temperature control IC (360) is used for controlling the graphene coating layer (220) to work at constant temperature;

A linear three-terminal voltage regulator IC (340) for providing a stable operating voltage for the temperature controlled IC (360);

an electrical power output pad (380); and

And a driving power tube (350) for being turned on or off according to a temperature measurement value of the graphene coating layer (220), thereby controlling whether the graphene coating layer (220) is electrified.

3. The novel graphene heat-generating sheet according to claim 2, wherein the on-off state of the driving power tube (350) is controlled by the temperature control IC (360) according to the temperature measurement value.

4. The novel graphene heat-generating sheet according to claim 1, wherein the temperature-control IC (360) adaptively switches the energization state of the graphene coating layer (220) such that the graphene coating layer (220) remains operating at a constant temperature target value based on a comparison of the temperature measurement value with the constant temperature target value.

5. The novel graphene heat-generating sheet according to claim 2, wherein the electric power output pad (380) of the constant temperature microcircuit module (300) is riveted and then soldered together by electrically connecting the copper rivet (370) with the electrode pad (211) of the copper foil circuit layer (210).

6. The novel graphene heat-generating sheet of claim 1, wherein the temperature sensor is a negative temperature coefficient resistance temperature sensor.

7. The novel graphene heat-generating sheet according to claim 2, wherein when the temperature measurement value of the graphene coating layer (220) is lower than a constant temperature target value, the driving power tube (350) is turned on, and the graphene coating layer (220) is electrified and heated up;

When the temperature measured value of the graphene coating layer (220) reaches the constant temperature target value, the driving power tube (350) is turned off, and the graphene coating layer (220) is powered off and cooled down.

8. The novel graphene heating sheet according to claim 1, wherein a temperature sensing probe (330) of the temperature sensor is attached to the graphene coating layer (220) through an insulating and heat conducting adhesive for measuring a temperature value of the graphene coating layer (220).

9. The novel graphene heat-generating sheet according to claim 1, wherein the copper foil circuit layer (210) is a hollow copper foil strip.

10. The novel graphene heat-generating sheet according to claim 1, wherein the graphene coating layer (220) comprises a plurality of graphene coating layer blocks sequentially laid on the copper foil circuit layer (210) to cover copper foil strips of the copper foil circuit layer (210).

11. The novel graphene heat-generating sheet according to claim 1, further comprising a protective film layer over the graphene coating layer (220).