技术领域technical field
本发明是有关一种电磁炉，特别是一种具有温度感测功能的电磁炉。The invention relates to an electromagnetic cooker, in particular to an electromagnetic cooker with a temperature sensing function.
背景技术Background technique
请参照图1，传统电磁炉10包含一陶瓷面板11、一电磁线圈12、一磁条13、一控制器14以及一电源电路15。电磁线圈12设置于陶瓷面板11下方，用以产生磁场。磁条13设置于电磁线圈12下方以限制磁回路。使用者透过操作面板输入控制指令，例如调整加热温度，控制器14即可调整电源电路15的输出功率来改变加热的温度。具有磁阻特性的锅具100则置于陶瓷面板11的上方进行加热。Please refer to FIG. 1 , a conventional induction cooker 10 includes a ceramic panel 11 , an electromagnetic coil 12 , a magnetic strip 13 , a controller 14 and a power circuit 15 . The electromagnetic coil 12 is disposed under the ceramic panel 11 for generating a magnetic field. The magnetic strip 13 is disposed under the electromagnetic coil 12 to limit the magnetic circuit. The user inputs control commands through the operation panel, such as adjusting the heating temperature, and the controller 14 can adjust the output power of the power circuit 15 to change the heating temperature. The pot 100 with magnetoresistive properties is placed above the ceramic panel 11 for heating.
目前已开发出能够感测锅具温度的电磁炉。请再参照图1，传统具有温度感测功能的电磁炉是在陶瓷面板11下方另设置一热敏电阻16，并以传导的方式量测锅具的温度。控制器14即可依据热敏电阻16的量测结果调整电源电路15的输出功率。然而，热敏电阻16以及锅具100间以陶瓷面板11分隔，因此，接触式量测温度的方法不仅反应速度慢，且热敏电阻16所量测的温度与锅具100的实际温度具有一温度差，亦即量测准确度较差。At present, an induction cooker capable of sensing the temperature of the pan has been developed. Please refer to FIG. 1 again. In a traditional induction cooker with temperature sensing function, a thermistor 16 is installed under the ceramic panel 11 to measure the temperature of the pot by conduction. The controller 14 can then adjust the output power of the power circuit 15 according to the measurement result of the thermistor 16 . However, the thermistor 16 and the pot 100 are separated by the ceramic panel 11. Therefore, the method of contact temperature measurement not only has a slow response speed, but also the temperature measured by the thermistor 16 has a certain relationship with the actual temperature of the pot 100. The temperature difference, that is, the measurement accuracy is poor.
另一种以非接触式量测锅具温度的电磁炉则是在锅具的侧面或是斜下方设置非接触式的温度传感器(例如红外线温度传感器)，以直接量测锅具的温度。然而，不同的锅具材质的表面辐射率差异甚大，导致现有的电磁炉无法获得准确的温度量测结果。如此一来，使用者无法精确掌控锅具温度因而造成许多使用上的不便，例如无法作更精细的养生烹调以避免破坏食材的营养、锅具温度太高而产生致癌物或损坏锅具等。Another type of induction cooker that measures the temperature of the pot in a non-contact manner is to install a non-contact temperature sensor (such as an infrared temperature sensor) on the side or obliquely below the pot to directly measure the temperature of the pot. However, the surface emissivity of different pot materials is very different, so that the existing induction cooker cannot obtain accurate temperature measurement results. In this way, the user cannot accurately control the temperature of the pot, which causes many inconveniences in use, such as the inability to perform more refined health-preserving cooking to avoid destroying the nutrition of the food, and the carcinogens or damage to the pot due to the high temperature of the pot.
有鉴于此，电磁炉如何准确感测加热中的锅具的温度便是目前极需努力的目标。In view of this, how to accurately sense the temperature of the pan being heated by the induction cooker is a goal that requires great efforts at present.
发明内容Contents of the invention
本发明提供一种具有温度感测功能的电磁炉，其是利用双通道热电堆传感器接收锅具所辐射的不同波段的红外线产生第一感测信号以及第二感测信号，并依据第一感测信号以及第二感测信号的比值即可查表得知不同材质锅具的实际温度。The invention provides an induction cooker with a temperature sensing function, which uses a dual-channel thermopile sensor to receive infrared rays of different bands radiated by a pan to generate a first sensing signal and a second sensing signal, and according to the first sensing The ratio of the signal to the second sensing signal can be used to look up the table to know the actual temperature of the cookware made of different materials.
本发明一实施例的具有温度感测功能的电磁炉包含一承载板、一电磁线圈模块、一温度传感器以及一控制器。承载板用以承载一锅具。电磁线圈模块设置于承载板的下方以定义出承载板上的一加热区域。温度传感器设置于承载板的下方，并包含一双通道热电堆传感器、一热敏电阻以及一信号处理器。双通道热电堆传感器用以感测锅具所辐射的一第一红外线波段以及一第二红外线波段的红外线并输出一第一感测信号以及一第二感测信号，其中第一红外线波段以及第二红外线波段相异。热敏电阻用以感测温度传感器所在区域的一环境温度，并输出相对应的环境温度信号。信号处理器与双通道热电堆传感器以及热敏电阻电性连接，并依据环境温度信号以及第一感测信号以及第二感测信号的比值查表得知锅具的一锅具温度，并输出相对应的一锅具温度信号。控制器与温度传感器电性连接，并依据锅具温度信号控制电磁线圈模块的输出功率。An electromagnetic oven with a temperature sensing function according to an embodiment of the present invention includes a carrier plate, an electromagnetic coil module, a temperature sensor and a controller. The carrying plate is used for carrying a pot. The electromagnetic coil module is disposed under the bearing plate to define a heating area on the bearing plate. The temperature sensor is arranged under the carrier board and includes a dual-channel thermopile sensor, a thermistor and a signal processor. The dual-channel thermopile sensor is used to sense infrared rays of a first infrared band and a second infrared band radiated by the pot and output a first sensing signal and a second sensing signal, wherein the first infrared band and the second The two infrared bands are different. The thermistor is used for sensing an ambient temperature in the area where the temperature sensor is located, and outputs a corresponding ambient temperature signal. The signal processor is electrically connected with the dual-channel thermopile sensor and the thermistor, and according to the ratio of the ambient temperature signal and the first sensing signal to the second sensing signal, the temperature of the pot is obtained by looking up the table, and output Corresponding to a pot temperature signal. The controller is electrically connected with the temperature sensor, and controls the output power of the electromagnetic coil module according to the temperature signal of the pot.
附图说明Description of drawings
为让本发明的上述目的、特征和优点能更明显易懂，以下结合附图对本发明的具体实施方式作详细说明，其中：In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:
图1为一示意图，显示已知的具有温度感测功能的电磁炉。FIG. 1 is a schematic diagram showing a known induction cooker with temperature sensing function.
图2为一示意图，显示本发明一实施例的具有温度感测功能的电磁炉。FIG. 2 is a schematic diagram showing an induction cooker with a temperature sensing function according to an embodiment of the present invention.
图3为一示意图，显示本发明一实施例的具有温度感测功能的电磁炉的温度传感器。FIG. 3 is a schematic diagram showing a temperature sensor of an induction cooker with a temperature sensing function according to an embodiment of the present invention.
图4为一曲线图，显示根据普朗克定律于不同波长下的黑体辐射能量值。FIG. 4 is a graph showing black body radiation energy values at different wavelengths according to Planck's law.
图中元件标号说明如下：The component numbers in the figure are explained as follows:
10 电磁炉10 induction cooker
100 锅具100 pots
11 陶瓷面板11 ceramic panels
12 电磁线圈12 solenoid coil
13 磁条13 magnetic stripe
14 控制器14 Controllers
15 电源电路15 power circuit
16 热敏电阻16 Thermistor
20 电磁炉20 induction cooker
21 承载板21 Carrier plate
211 视窗211 windows
212 保护盖212 Protective cover
22 电磁线圈模块22 Solenoid Coil Module
221 电磁线圈221 Solenoid Coil
222 磁条222 magnetic stripe
23 温度传感器23 temperature sensor
231 双通道热电堆传感器231 Dual Channel Thermopile Sensor
231a、231b 热电堆感测元件231a, 231b Thermopile sensing element
231c、231d 滤波片231c, 231d filter
232 热敏电阻232 Thermistor
233 信号处理器233 signal processor
233a 偏压电阻233a Bias resistor
233b 可编程放大器233b programmable amplifier
233c 多工器233c multiplexer
233d 模拟至数字转换器233d Analog to Digital Converter
233e 微控制器233e microcontroller
234 防磁套234 Anti-magnetic sleeve
24 控制器24 controllers
241 电源电路241 power circuit
25 无线通讯元件25 wireless communication components
30 外部电子装置30 External Electronics
AT 环境温度信号AT ambient temperature signal
PT 锅具温度信号PT pot temperature signal
S1 第一感测信号S1 first sensing signal
S2 第二感测信号S2 Second sensing signal
具体实施方式Detailed ways
以下将详述本发明的各实施例，并配合附图作为例示。除了这些详细说明之外，本发明亦可广泛地施行于其它的实施例中，任何所述实施例的轻易替代、修改、等效变化都包含在本发明的范围内，并以权利要求书为准。在说明书的描述中，为了使读者对本发明有较完整的了解，提供了许多特定细节；然而，本发明可能在省略部分或全部特定细节的前提下，仍可实施。此外，众所周知的步骤或元件并未描述于细节中，以避免对本发明形成不必要的限制。附图中相同或类似的元件将以相同或类似符号来表示。特别注意的是，附图仅为示意之用，并非代表元件实际的尺寸或数量，有些细节可能未完全绘出，以求附图的简洁。Various embodiments of the present invention will be described in detail below and illustrated with accompanying drawings. In addition to these detailed descriptions, the present invention can also be widely implemented in other embodiments, and any easy replacement, modification, and equivalent change of any of the described embodiments are included in the scope of the present invention, and are defined by the claims allow. In the description of the specification, many specific details are provided in order to enable readers to have a more complete understanding of the present invention; however, the present invention may still be practiced under the premise of omitting some or all of the specific details. Furthermore, well-known steps or elements have not been described in detail in order to avoid unnecessarily limiting the invention. The same or similar elements will be denoted by the same or similar symbols in the drawings. It should be noted that the drawings are for illustrative purposes only, and do not represent the actual size or quantity of components, and some details may not be fully drawn in order to simplify the drawings.
由于锅具的材质不同，导致锅具的表面辐射率差异甚大。举例而言，铁锅的表面辐射率约为0.7；不锈钢锅的表面辐射率约为0.1(亮面)至0.5(氧化处理)；铝锅的表面辐射率约为0.1。因此，非接触式的红外线传感器若无法修正待测物的表面辐射率的差异时，其所量测的锅具温度则不准确。本发明即是为了克服上述问题所提出。请参照图2，本发明的一实施例的具有温度感测功能的电磁炉20包含一承载板21、一电磁线圈模块22、一温度传感器23以及一控制器24。承载板21用以承载一锅具100。举例而言，承载板21可为一陶瓷板。于一实施例中，承载板21包含一视窗211，让锅具100所辐射的红外线可经由视窗211透过承载板21。于一较佳实施例中，承载板21包含一保护盖212，其覆盖视窗211，以避免脏污落入视窗211内。举例而言，保护盖212的材料可为硅、锗、蓝宝石或氟化钙(CaF2)等可穿透红外线的材料。Due to the different materials of the pot, the surface emissivity of the pot varies greatly. For example, the surface emissivity of an iron pan is about 0.7; the surface emissivity of a stainless steel pan is about 0.1 (bright surface) to 0.5 (oxidation treatment); the surface emissivity of an aluminum pan is about 0.1. Therefore, if the non-contact infrared sensor cannot correct the difference in surface emissivity of the object to be measured, the temperature of the pot measured by it will be inaccurate. The present invention proposes in order to overcome the above-mentioned problems. Referring to FIG. 2 , an induction cooker 20 with a temperature sensing function according to an embodiment of the present invention includes a carrier plate 21 , an electromagnetic coil module 22 , a temperature sensor 23 and a controller 24 . The carrying board 21 is used for carrying a pot 100 . For example, the carrying board 21 can be a ceramic board. In one embodiment, the carrying plate 21 includes a window 211 , so that the infrared rays radiated by the pot 100 can pass through the carrying plate 21 through the window 211 . In a preferred embodiment, the carrier board 21 includes a protective cover 212 covering the window 211 to prevent dirt from falling into the window 211 . For example, the material of the protective cover 212 can be silicon, germanium, sapphire, or calcium fluoride (CaF2 ), which can penetrate infrared rays.
电磁线圈模块22设置于承载板21的下方，以定义出承载板21上的一加热区域。换言之，加热区域即是被电磁线圈模块22涵盖的区域，在加热区域内才具备加热的功能。举例而言，电磁线圈模块22包含电磁线圈221以及磁条222。电磁线圈221用以产生磁场。磁条222则设置于电磁线圈221下方以限制磁回路。具有磁阻特性的锅具100则受到电磁线圈221所产生的磁场作用而转换成热能。The electromagnetic coil module 22 is disposed under the supporting board 21 to define a heating area on the supporting board 21 . In other words, the heating area is the area covered by the electromagnetic coil module 22 , and only the heating area has the heating function. For example, the electromagnetic coil module 22 includes an electromagnetic coil 221 and a magnetic strip 222 . The electromagnetic coil 221 is used to generate a magnetic field. The magnetic strip 222 is disposed under the electromagnetic coil 221 to limit the magnetic circuit. The cookware 100 with magnetoresistive properties is converted into heat energy by the action of the magnetic field generated by the electromagnetic coil 221 .
温度传感器23设置于承载板21的下方。于一实施例中，温度传感器23是设置于对应加热区域内的承载板21下方。较佳者，温度传感器23是设置于对应加热区域的几何中心的承载板21下方。依据此结构，温度传感器23是指向锅具100的底部，以接收锅具所辐射的红外线。The temperature sensor 23 is disposed under the supporting board 21 . In one embodiment, the temperature sensor 23 is disposed under the supporting plate 21 in the corresponding heating area. Preferably, the temperature sensor 23 is disposed under the bearing plate 21 corresponding to the geometric center of the heating area. According to this structure, the temperature sensor 23 is directed to the bottom of the pot 100 to receive the infrared rays radiated by the pot.
请一并参照图3，温度传感器23包含一双通道热电堆传感器231、一热敏电阻232以及一信号处理器233。双通道热电堆传感器231可感测锅具100所辐射的一第一红外线波段以及一第二红外线波段的红外线并输出一第一感测信号S1以及一第二感测信号S2，其中第一红外线波段以及第二红外线波段彼此相异。举例而言，双通道热电堆传感器231包含二个热电堆感测元件231a、231b，且热电堆感测元件231a、231b的接收端分别设置第一红外线波段以及第二红外线波段的一滤波片231c、231d，其中滤波片231c允许第一红外线波段的红外线通过，而滤波片231d允许第二红外线波段的红外线通过。依据此结构，热电堆感测元件231a、231b即分别感测锅具100所辐射的第一红外线波段以及第二红外线波段的红外线，并分别输出输出第一感测信号S1以及第二感测信号S2。可以理解的是，二个热电堆感测元件231a、231b可设置于彼此独立的二个芯片或单一芯片上。此外，二个热电堆感测元件231a、231b可设置于单一封装件中，亦可设置于不同的封装件中。热敏电阻232感测温度传感器23所在区域的一环境温度，并输出相对应的环境温度信号AT。Please refer to FIG. 3 together. The temperature sensor 23 includes a dual-channel thermopile sensor 231 , a thermistor 232 and a signal processor 233 . The dual-channel thermopile sensor 231 can sense infrared rays of a first infrared band and a second infrared band radiated by the cookware 100 and output a first sensing signal S1 and a second sensing signal S2, wherein the first infrared The band and the second infrared band are different from each other. For example, the dual-channel thermopile sensor 231 includes two thermopile sensing elements 231a, 231b, and the receiving ends of the thermopile sensing elements 231a, 231b are respectively provided with a filter 231c of the first infrared band and the second infrared band. , 231d, wherein the filter 231c allows infrared rays in the first infrared band to pass through, and the filter 231d allows infrared rays in the second infrared band to pass through. According to this structure, the thermopile sensing elements 231a, 231b respectively sense the infrared rays of the first infrared band and the second infrared band radiated by the pot 100, and output the first sensing signal S1 and the second sensing signal respectively. S2. It can be understood that the two thermopile sensing elements 231a, 231b can be disposed on two independent chips or a single chip. In addition, the two thermopile sensing elements 231a, 231b can be disposed in a single package or in different packages. The thermistor 232 senses an ambient temperature in the area where the temperature sensor 23 is located, and outputs a corresponding ambient temperature signal AT.
信号处理器233与双通道热电堆传感器231以及热敏电阻232电性连接。于一实施例中，信号处理器233包含一偏压电阻233a、一可编程放大器233b、一多工器233c、一模拟至数字转换器233d以及一微控制器233e。偏压电阻233a用以量测热敏电阻232的一电阻值，进而演算出双通道热电堆传感器231的环境温度。可编程放大器233b放大双通道热电堆传感器231所输出的第一感测信号S1以及第二感测信号S2。多工器233c与偏压电阻233a以及可编程放大器233b电性连接。多工器233c可切换来自热敏电阻233a的环境温度信号AT或可编程放大器233b所放大的第一感测信号S1以及第二感测信号S1。模拟至数字转换器233d与多工器233c电性连接，用以将多工器233c所输出的信号转换为一数字信号。于一实施例中，模拟至数字转换器233d可为Sigma-Delta型式，且其解析度大于14比特。微控制器233e与模拟至数字转换器233d电性连接。微控制器233e可依据环境温度信号AT以及第一感测信号S1及第二感测信号S1的比值查表得知锅具100的锅具温度，并输出相对应的一锅具温度信号PT。于一实施例中，信号处理器233包含一输出端口，举例而言，输出端口可为集成电路总线(Inter-Integrated Circuit Bus，I2C)、通用非同步接收发送器(UniversalAsynchronous Receiver/Transmitter，UART)、串行周边接口(Serial PeripheralInterface，SPI)或通用串行总线(Universal Serial Bus，USB)等。取得锅具温度的详细说明容后解释。The signal processor 233 is electrically connected to the dual-channel thermopile sensor 231 and the thermistor 232 . In one embodiment, the signal processor 233 includes a bias resistor 233a, a programmable amplifier 233b, a multiplexer 233c, an analog-to-digital converter 233d and a microcontroller 233e. The bias resistor 233 a is used to measure a resistance value of the thermistor 232 to calculate the ambient temperature of the dual-channel thermopile sensor 231 . The programmable amplifier 233b amplifies the first sensing signal S1 and the second sensing signal S2 output by the dual-channel thermopile sensor 231 . The multiplexer 233c is electrically connected to the bias resistor 233a and the programmable amplifier 233b. The multiplexer 233c can switch the ambient temperature signal AT from the thermistor 233a or the first sensing signal S1 and the second sensing signal S1 amplified by the programmable amplifier 233b. The analog-to-digital converter 233d is electrically connected to the multiplexer 233c for converting the output signal of the multiplexer 233c into a digital signal. In one embodiment, the analog-to-digital converter 233d can be a Sigma-Delta type, and its resolution is greater than 14 bits. The microcontroller 233e is electrically connected to the analog-to-digital converter 233d. The microcontroller 233e can look up the pot temperature of the pot 100 according to the ambient temperature signal AT and the ratio of the first sensing signal S1 and the second sensing signal S1, and output a corresponding pot temperature signal PT. In one embodiment, the signal processor 233 includes an output port. For example, the output port can be an integrated circuit bus (Inter-Integrated Circuit Bus, I2 C), a universal asynchronous receiver/transmitter (Universal Asynchronous Receiver/Transmitter, UART), Serial Peripheral Interface (Serial Peripheral Interface, SPI) or Universal Serial Bus (Universal Serial Bus, USB), etc. Detailed instructions for obtaining the temperature of the pan are explained later.
控制器24与温度传感器23电性连接。控制器24即可依据温度传感器23所测得的锅具温度信号PT控制电磁线圈模块22的输出功率。举例而言，控制器24可透过调整电源电路241的输出功率来控制电磁线圈模块22的输出功率。举例而言，锅具干烧使锅具温度大于一预设温度时，控制器24即关闭电磁炉，以避免发生危险；或者锅具内的材料沸腾时控制器24可降低电磁线圈模块22的输出功率，以避免汤汁溢出。The controller 24 is electrically connected to the temperature sensor 23 . The controller 24 can control the output power of the electromagnetic coil module 22 according to the pot temperature signal PT measured by the temperature sensor 23 . For example, the controller 24 can control the output power of the electromagnetic coil module 22 by adjusting the output power of the power supply circuit 241 . For example, when the pot is dry and the temperature of the pot is higher than a preset temperature, the controller 24 will shut down the induction cooker to avoid danger; or the controller 24 can reduce the output of the electromagnetic coil module 22 when the material in the pot is boiling. Power to avoid soup overflowing.
温度传感器23的金属外壳可能受到电磁线圈模块22所产生的磁场影响而被加热。于一实施例中，请再参照图2，本发明的电磁炉20更包含一防磁套234，且温度传感器23则设置于防磁套234内。于一实施例中，防磁套234可为一导磁材料所组成，以避免电磁线圈模块22所产生的磁场对温度传感器23造成损坏。举例而言，防磁套234的材质可为铝质或铜质。The metal casing of the temperature sensor 23 may be heated by the magnetic field generated by the electromagnetic coil module 22 . In an embodiment, please refer to FIG. 2 again, the induction cooker 20 of the present invention further includes an antimagnetic cover 234 , and the temperature sensor 23 is disposed in the antimagnetic cover 234 . In one embodiment, the antimagnetic cover 234 can be made of a magnetically permeable material, so as to prevent the temperature sensor 23 from being damaged by the magnetic field generated by the electromagnetic coil module 22 . For example, the antimagnetic cover 234 can be made of aluminum or copper.
于一实施例中，本发明一实施例的电磁炉20更包含一无线通讯元件25，其与控制器24电性连接。无线通讯元件25可传送锅具温度等信息至一外部电子装置30或是自外部电子装置30接收一控制信号以控制电磁线圈模块22的输出功率。举例而言，外部电子装置30可为一行动上网装置或一电脑。此外，外部电子装置30亦可为一网关(gateway)，使本发明的电磁炉20可连接网际网络(Internet)，并与云端的服务器或远端的行动上网装置连立通讯连线。举例而言，温度传感器23检测到锅具100的温度异常时，控制器24可调整电磁线圈模块22的输出功率或关闭电磁炉。同时，控制器24可透过无线通讯元件25与行动上网装置30连接，或是透过网关连接网际网络而与云端的服务器或远端的行动上网装置通讯，如此即可传送温度信息以及警示信号至云端的服务器或远端的行动上网装置30，以通知使用者即时处理。In one embodiment, the induction cooker 20 according to one embodiment of the present invention further includes a wireless communication component 25 electrically connected to the controller 24 . The wireless communication element 25 can transmit information such as the temperature of the pot to an external electronic device 30 or receive a control signal from the external electronic device 30 to control the output power of the electromagnetic coil module 22 . For example, the external electronic device 30 can be a mobile Internet device or a computer. In addition, the external electronic device 30 can also be a gateway, so that the induction cooker 20 of the present invention can be connected to the Internet and communicate with a cloud server or a remote mobile Internet device. For example, when the temperature sensor 23 detects that the temperature of the pot 100 is abnormal, the controller 24 can adjust the output power of the electromagnetic coil module 22 or turn off the induction cooker. At the same time, the controller 24 can be connected to the mobile Internet device 30 through the wireless communication element 25, or connected to the Internet through the gateway to communicate with the cloud server or the remote mobile Internet device, so that temperature information and warning signals can be transmitted. to the server in the cloud or the remote mobile Internet access device 30 to notify the user of real-time processing.
以下说明本发明如何利用环境温度信号以及第一感测信号以及第二感测信号的比值查表得知锅具的锅具温度。请参照图4，其显示根据普朗克定律，在不同波长下的黑体辐射能量值，其中长虚线代表摄氏400度时的黑体辐射能量值；实线代表摄氏300度时的黑体辐射能量值；短虚线代表摄氏200度时的黑体辐射能量值。当使用二个热电堆感测元件231a、231b分别感测第一红外线波段(波长范围为λa1至λa2)以及第二红外线波段(波长范围为λb1至λb2)的物体红外线热辐射值时，则第一感测信号以及第二感测信号能够以下列公式(1)、公式(2)表示：The following describes how the present invention uses the ambient temperature signal and the ratio of the first sensing signal and the second sensing signal to look up the pot temperature of the pot. Please refer to Figure 4, which shows the black body radiation energy values at different wavelengths according to Planck's law, where the long dashed line represents the black body radiation energy value at 400 degrees Celsius; the solid line represents the black body radiation energy value at 300 degrees Celsius; The short dashed line represents the black body radiated energy value at 200 degrees Celsius. When the two thermopile sensing elements 231a and 231b are used to respectively sense the infrared heat radiation value of the object in the first infrared band (the wavelength range is from λa1 to λa2) and the second infrared band (the wavelength range is from λb1 to λb2), then the second A sensing signal and a second sensing signal can be represented by the following formula (1) and formula (2):
其中，V1、V2分别为二个热电堆感测元件231a、231b的输出电压值；β1、β2分别为二个热电堆感测元件231a、231b的反应电压值(responsivity)；e1为待测物(例如锅具)的辐射率；e2为热电堆感测元件231a、231b的辐射率；Tp为待测物的温度；Ts为热电堆感测元件231a、231b的环境温度；λa1至λa2为第一红外线波段；λb1至λb2为第二红外线波段。公式(1)以及公式(2)代表热电堆感测元件231a、231b的输出电压值为待测物于温度Tp时的辐射量与热电堆感测元件231a、231b于温度Ts时的辐射量的差值。Wherein, V1, V2 are respectively the output voltage values of the two thermopile sensing elements 231a, 231b; β1, β2 are respectively the response voltage values (responsivity) of the two thermopile sensing elements 231a, 231b; e1 is the object under test e2 is the emissivity of the thermopile sensing elements 231a, 231b; Tp is the temperature of the object to be measured; Ts is the ambient temperature of the thermopile sensing elements 231a, 231b; λa1 to λa2 are the first An infrared band; λb1 to λb2 are the second infrared band. Formula (1) and formula (2) represent that the output voltage value of the thermopile sensing elements 231a, 231b is the ratio of the radiation amount of the object under test at the temperature Tp and the radiation amount of the thermopile sensing elements 231a, 231b at the temperature Ts difference.
一般而言，热电堆感测元件231a、231b的辐射率为1，将其代入公式(1)以及公式(2)并移项后，即得下列公式(3)以及公式(4)：Generally speaking, the emissivity of the thermopile sensing elements 231a and 231b is 1, and after substituting it into formula (1) and formula (2) and shifting the terms, the following formula (3) and formula (4) can be obtained:
将公式(3)以及公式(4)相除，消去待测物的辐射率e1即得下列公式(5)：Divide formula (3) and formula (4) and eliminate the emissivity e1 of the object to be tested to get the following formula (5):
公式(5)的等号右侧代表待测物于温度Tp时，于第一红外线波段以及第二红外线波段的相对黑体辐射值的比值，其与待测物的辐射率e1无关。公式(5)的等号左侧代表热电堆感测元件231a、231b分别针对第一红外线波段以及第二红外线波段的量测值加上热电堆感测元件231a、231b于环境温度Ts时的黑体辐射值后的比值。The right side of the equal sign in the formula (5) represents the ratio of the relative black body radiation value of the object under test at the temperature Tp in the first infrared band and the second infrared band, which has nothing to do with the emissivity e1 of the object under test. The left side of the equal sign in formula (5) represents the measured values of the thermopile sensing elements 231a and 231b for the first infrared band and the second infrared band respectively plus the black body of the thermopile sensing elements 231a and 231b at the ambient temperature Ts Ratio after radiation value.
可以理解的是，为了获得更为准确的量测结果，可事先校正热电堆感测元件231a、231b，以获得热电堆感测元件231a、231b于不同环境温度Ts时于第一红外线波段以及第二红外线波段的黑体辐射值，亦即公式(5)中以及与环境温度Ts的特性曲线。同时，校正时一并取得热电堆感测元件231a、231b分别针对第一红外线波段以及第二红外线波段的量测值以及公式(5)的等号右侧的比值，如此即可建立热电堆感测元件231a、231b的量测值的比值以及公式(5)的等号右侧的比值的一温度校正曲线。使用时，信号处理器233即可依据热电堆感测元件231a、231b的环境温度Ts以及第一感测信号S1及第二感测信号S1的比值，查询事先建立的温度校正曲线即可得知锅具的精确温度。It can be understood that, in order to obtain more accurate measurement results, the thermopile sensing elements 231a, 231b can be calibrated in advance, so as to obtain the first infrared band and the second infrared band of the thermopile sensing elements 231a, 231b at different ambient temperatures Ts. The blackbody radiation value of the second infrared band, that is, in the formula (5) as well as Characteristic curve with ambient temperature Ts. At the same time, the measured values of the thermopile sensing elements 231a and 231b respectively for the first infrared band and the second infrared band and the right side of the equal sign of formula (5) are obtained together during calibration. In this way, a temperature calibration curve of the ratio of the measured values of the thermopile sensing elements 231a, 231b and the ratio on the right side of the equal sign of the formula (5) can be established. When in use, the signal processor 233 can query the temperature calibration curve established in advance according to the ambient temperature Ts of the thermopile sensing elements 231a, 231b and the ratio of the first sensing signal S1 to the second sensing signal S1 to obtain The precise temperature of the pan.
综合上述，本发明的具有温度感测功能的电磁炉是利用双通道热电堆传感器接收锅具所辐射的不同波段的红外线分别产生第一感测信号以及第二感测信号，并依据第一感测信号以及第二感测信号的比值查询事先建立的温度校正曲线可得知不同材质锅具的精确温度。此外，本发明是直接量测锅具所辐射的红外线，因此能即时获得锅具的精确温度。较佳者，本发明的温度传感器是朝向锅具的底部，亦即在电磁炉的加热区域的下方，因此温度传感器不会额外占用其它空间，使得本发明的电磁炉的体积较小。To sum up the above, the electromagnetic oven with temperature sensing function of the present invention uses a dual-channel thermopile sensor to receive infrared rays of different bands radiated by the pan to generate a first sensing signal and a second sensing signal respectively, and according to the first sensing The ratio of the signal and the second sensing signal can be used to query the pre-established temperature calibration curve to obtain the precise temperature of the cookware made of different materials. In addition, the present invention directly measures the infrared rays radiated by the pot, so the precise temperature of the pot can be obtained in real time. Preferably, the temperature sensor of the present invention is towards the bottom of the pot, that is, below the heating area of the induction cooker, so the temperature sensor does not occupy additional space, making the volume of the induction cooker of the present invention smaller.
虽然本发明已以较佳实施例揭示如上，然其并非用以限定本发明，任何本领域技术人员，在不脱离本发明的精神和范围内，当可作些许的修改和完善，因此本发明的保护范围当以权利要求书所界定的为准。Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be defined by the claims.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611145199.2ACN108224497A (en) | 2016-12-13 | 2016-12-13 | electromagnetic oven with temperature sensing function |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611145199.2ACN108224497A (en) | 2016-12-13 | 2016-12-13 | electromagnetic oven with temperature sensing function |
| Publication Number | Publication Date |
|---|---|
| CN108224497Atrue CN108224497A (en) | 2018-06-29 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611145199.2APendingCN108224497A (en) | 2016-12-13 | 2016-12-13 | electromagnetic oven with temperature sensing function |
| Country | Link |
|---|---|
| CN (1) | CN108224497A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111504476A (en)* | 2019-01-31 | 2020-08-07 | 众智光电科技股份有限公司 | Infrared temperature sensor |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61250422A (en)* | 1985-04-25 | 1986-11-07 | Matsushita Electric Ind Co Ltd | Micro wave oven having sensor |
| CN1216108A (en)* | 1996-01-10 | 1999-05-05 | 恩格尔哈德传感器技术公司 | Passive infrared analysis gas sensors and applicable multichannel detector assemblies |
| CN201352153Y (en)* | 2008-09-03 | 2009-11-25 | 袁剑敏 | Non-contact infrared thermometer for human body and object surface |
| CN201724740U (en)* | 2010-05-21 | 2011-01-26 | 天泽业达(厦门)电子科技有限公司 | Non-contact infrared multifunctional temperature measurement instrument |
| CN201811805U (en)* | 2010-08-31 | 2011-04-27 | 浙江伦特机电有限公司 | Integrated temperature sensor |
| CN202040863U (en)* | 2011-04-12 | 2011-11-16 | 珠海优特电力科技股份有限公司 | Intelligent induction cooker interacting with person in cooking process |
| CN102608064A (en)* | 2012-04-10 | 2012-07-25 | 河南汉威电子股份有限公司 | Three-channel infrared gas sensor for CO gas high-precision detection |
| CN203454224U (en)* | 2013-08-08 | 2014-02-26 | 九阳股份有限公司 | Induction cooker |
| CN104111258A (en)* | 2013-04-18 | 2014-10-22 | 株式会社捷太格特 | Optical non-destructive inspection apparatus and optical non-destructive inspection method |
| CN206430206U (en)* | 2016-12-13 | 2017-08-22 | 众智光电科技股份有限公司 | Induction cooker with temperature sensing function |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61250422A (en)* | 1985-04-25 | 1986-11-07 | Matsushita Electric Ind Co Ltd | Micro wave oven having sensor |
| CN1216108A (en)* | 1996-01-10 | 1999-05-05 | 恩格尔哈德传感器技术公司 | Passive infrared analysis gas sensors and applicable multichannel detector assemblies |
| CN201352153Y (en)* | 2008-09-03 | 2009-11-25 | 袁剑敏 | Non-contact infrared thermometer for human body and object surface |
| CN201724740U (en)* | 2010-05-21 | 2011-01-26 | 天泽业达(厦门)电子科技有限公司 | Non-contact infrared multifunctional temperature measurement instrument |
| CN201811805U (en)* | 2010-08-31 | 2011-04-27 | 浙江伦特机电有限公司 | Integrated temperature sensor |
| CN202040863U (en)* | 2011-04-12 | 2011-11-16 | 珠海优特电力科技股份有限公司 | Intelligent induction cooker interacting with person in cooking process |
| CN102608064A (en)* | 2012-04-10 | 2012-07-25 | 河南汉威电子股份有限公司 | Three-channel infrared gas sensor for CO gas high-precision detection |
| CN104111258A (en)* | 2013-04-18 | 2014-10-22 | 株式会社捷太格特 | Optical non-destructive inspection apparatus and optical non-destructive inspection method |
| CN203454224U (en)* | 2013-08-08 | 2014-02-26 | 九阳股份有限公司 | Induction cooker |
| CN206430206U (en)* | 2016-12-13 | 2017-08-22 | 众智光电科技股份有限公司 | Induction cooker with temperature sensing function |
| Title |
|---|
| 张建忠: "《传感器与检测技术（第2版）》", 31 August 2014, 北京邮电大学出版社* |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111504476A (en)* | 2019-01-31 | 2020-08-07 | 众智光电科技股份有限公司 | Infrared temperature sensor |
| Publication | Publication Date | Title |
|---|---|---|
| CN206430206U (en) | Induction cooker with temperature sensing function | |
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| JP6506569B2 (en) | Induction cooker |
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|---|---|---|---|
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| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | Application publication date:20180629 |