WO2019006753A1 - 一种电磁炉的电磁加热系统及其控制方法 - Google Patents

一种电磁炉的电磁加热系统及其控制方法 Download PDF

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Publication number
WO2019006753A1
WO2019006753A1 PCT/CN2017/092261 CN2017092261W WO2019006753A1 WO 2019006753 A1 WO2019006753 A1 WO 2019006753A1 CN 2017092261 W CN2017092261 W CN 2017092261W WO 2019006753 A1 WO2019006753 A1 WO 2019006753A1
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electromagnetic heating
module
alloy
igbt
rectifier
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PCT/CN2017/092261
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English (en)
French (fr)
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廖哲
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肇庆市天宇进出口贸易有限公司
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Priority to PCT/CN2017/092261 priority Critical patent/WO2019006753A1/zh
Publication of WO2019006753A1 publication Critical patent/WO2019006753A1/zh

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements

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  • the invention relates to the technical field of kitchen utensils, and more particularly to an electromagnetic heating system of an electromagnetic oven, and also relates to a control method of an electromagnetic heating system of an electromagnetic oven.
  • the induction cooker structure generally includes a casing, a panel disposed on the casing, and an electromagnetic heating coil and a control circuit board disposed between the casing and the panel.
  • the induction cooker of the general structure is sufficient for heating. The need, after the induction cooker is turned on, the electromagnetic heating coil is energized and generates heat, which is transmitted through the panel to the appliance to be heated, such as a pot.
  • the ordinary induction cooker cannot realize the control of the temperature.
  • the induction cooker When the induction cooker is turned on, it will always be in a heating state, and the heating temperature cannot be controlled within a reasonable range.
  • some induction cookers are provided with a temperature sensor, and the temperature sensor is generally set. In the position close to the panel, the temperature of the panel can be detected by the temperature sensor, and then the panel temperature is controlled within a certain range by circuit control.
  • this method can control the temperature, there are still many deficiencies, for example, the temperature sensor pair The temperature detection has a certain hysteresis, so its temperature control accuracy is low.
  • the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an electromagnetic oven electromagnetic heating system capable of conveniently implementing temperature control.
  • the invention also provides a control method capable of conveniently implementing electromagnetic heating of an electromagnetic oven.
  • the technical solution adopted by the present invention is:
  • the invention relates to an electromagnetic heating system, comprising a first rectifier, an electromagnetic heating module, an IGBT, an IGBT driving module, a current detecting module and a control module, wherein: the input end of the rectifier DB1 is connected with a power interface, and one output end is electromagnetic heating.
  • the input end of the module is connected, the output end of the electromagnetic heating module is connected to the C end of the IGBT, the E end of the IGBT is connected to the input end of the current detecting module, and the G end of the IGBT is connected to the IGBT driving module, and the current detecting module is The output is grounded at the same time as the other output of the finisher DB1 Connected, the control module is connected to the current detecting module.
  • the electromagnetic heating module includes a parallel electromagnetic heating coil and a capacitor C2.
  • the current detecting module includes a resistor R1 and a capacitor C1.
  • One end of the resistor R1 is connected to the E terminal of the IGBT, and the other end is grounded and connected to the output end of the rectifier DB1.
  • the capacitor C1 is connected in parallel with the resistor R1, and one end of the capacitor C1. It is connected to the E terminal of the IGBT and connected to the control module, and the other end is grounded and connected to the output of the rectifier DB1.
  • the current detecting module comprises a current transformer CT, a rectifier DB2, a resistor R1 and a capacitor C1.
  • the first input end of the current transformer CT is connected to the E pole of the IGBT, the second input end is grounded and connected to the finisher DB1, and the rectifier DB2
  • the first input end is connected to the first output end of the current transformer
  • the second input end of the rectifier DB2 is connected to the second output end of the current transformer CT
  • one end of the resistor R1 is connected to the first output end of the rectifier DB2, the resistor
  • the other end of R1 is connected to the second output end of the rectifier DB2.
  • One end of the capacitor C1 is connected to one end of the resistor R1 and connected to the control module, and the other end of the capacitor C1 is grounded to the other end of the resistor R1.
  • the electromagnetic heating module comprises a temperature control layer capable of sensing an electromagnetic signal generated by the electromagnetic heating coil.
  • the temperature control layer is usually made of ferromagnetic or ferrimagnetic material, such as permalloy, precision alloy, and its magnetic permeability will suddenly drop to zero or close to zero when at the Curie point, the temperature control layer
  • the magnetic permeability is 2,000 to 200,000 H/m, and the specific temperature of the temperature control layer is 30 to 130 ⁇ cm.
  • the temperature control layer is disposed above the electromagnetic heating module.
  • the induction cooker includes a panel, the temperature control layer is disposed on the panel, or a cooker is disposed above the induction cooker, and the temperature control layer is disposed on the cookware.
  • the temperature control layer is made of a permalloy material or a precision alloy material.
  • the Permalloy material or the precision alloy material has a Curie point temperature of between 30 degrees Celsius and 500 degrees Celsius. It is preferably between 70 degrees Celsius and 400 degrees Celsius, and further preferably between 180 degrees Celsius and 350 degrees Celsius.
  • the temperature of the temperature control layer reaches the Curie point of the temperature control layer, the magnetic permeability of the temperature control layer will suddenly decrease to near zero, and its temperature will stop rising.
  • the precision alloy material is a material having a Curie point temperature between 180 degrees Celsius and 230 degrees Celsius.
  • precision alloy 4J36 (Shanghai Kaiye Metal Products Co., Ltd. The company produces) or precision alloy 4J32 (manufactured by Shanghai Kaiye Metal Products Co., Ltd.).
  • Precision Alloy 4J36 is a special low expansion iron-nickel alloy with ultra-low expansion coefficient, its Curie point is 230 degrees Celsius; precision alloy 4J32 alloy, also known as Super-Invar alloy, has a Curie point temperature of 220 degrees Celsius.
  • the precision alloy materials that can be applied to this patent are preferably the following alloy materials listed in the standard numbers GB/T15018-94, YB/T5239-2005, YB/T5262-93, YB/T5254-2011, among which the standard No. GB/T15018-94 refers to the "National Standard Precision Alloy Grade of the People's Republic of China", and the standard number YB/T5254-2011 refers to the "Black Metallurgical Industry Standard of the People's Republic of China”.
  • the chemical composition of the elastic alloy 3J53 in the table includes:
  • the content of C element is not more than 0.05%
  • the content of the S element is not more than 0.020%
  • the content of P element is not more than 0.020%
  • the content of Mn element is not more than 0.80%;
  • the content of Si element is not more than 0.80%;
  • Ni element The content of Ni element is 41.5% to 43.0%;
  • the content of Cr element is 5.2% to 5.8%;
  • the content of Ti element is 2.3% to 2.7%;
  • the content of Al element is 0.5% to 0.8%;
  • the balance is Fe element.
  • the chemical composition of the elastic alloy 3J58 includes:
  • the content of C element is not more than 0.05%
  • the content of the S element is not more than 0.020%
  • the content of P element is not more than 0.020%
  • the content of Mn element is not more than 0.80%;
  • the content of Si element is not more than 0.80%;
  • Ni element The content of Ni element is 43.0% to 43.6%;
  • the content of Cr element is 5.2% to 5.6%
  • the content of Ti element is 2.3% to 2.7%;
  • the content of Al element is 0.5% to 0.8%;
  • the balance is Fe element.
  • the chemical composition of precision alloy 4J32 includes:
  • the content of C element is not more than 0.05%
  • the content of the S element is not more than 0.020%
  • the content of P element is not more than 0.020%
  • the content of the Mn element is 0.20% to 0.60%;
  • the content of Si element is not more than 0.20%;
  • Ni element is 31.5% to 33.0%;
  • the content of Co element is 3.2% to 4.2%;
  • the content of Cu element is 0.4% to 0.8%;
  • the balance is Fe element.
  • the chemical composition of precision alloy 4J36 includes:
  • the content of C element is not more than 0.05%
  • the content of the S element is not more than 0.020%
  • the content of P element is not more than 0.020%
  • the content of the Mn element is 0.20% to 0.60%;
  • the content of Si element is not more than 0.30%;
  • Ni element is 35.0% to 37.0%;
  • the balance is Fe element.
  • the above alloy materials can be supplied by Shanghai Kaiye Metal Products Co., Ltd. or through other public sales channels.
  • the content of iron in the permalloy is 35 to 70%, and the content of nickel is 30 to 65%.
  • the content of iron in the permalloy is 35 to 70%, and the content of nickel is 30 to 65%.
  • the invention also provides an electromagnetic heating control method, which first provides the above electromagnetic heating system and comprises the following steps:
  • S1 sets the expected heating temperature value or the current value corresponding to the temperature value, which is recorded as T 0 ; because there is a specific correspondence between the temperature value and the current value under the action of temperature control, a certain temperature value corresponds to a specific one.
  • the current value in the same way, a certain current value also corresponds to a specific temperature value. Therefore, the temperature value and the current value have an equivalent replacement relationship, and the set temperature value or the current value can be finally reflected in the temperature value;
  • the S2 control module controls the heating of the electromagnetic heating coil and heats the temperature control layer
  • the S3 current detecting module detects the current parameter value in the electromagnetic heating coil, and records it as I 1 .
  • S4 converts I 1 into a corresponding temperature value, denoted as T 1 , and compares T 1 with T 0 + ⁇ t.
  • T 1 a corresponding temperature value
  • the control module controls the electromagnetic heating coil to continue heating, when T 1 ⁇
  • the electromagnetic heating coil stops heating or reduces the heating power; or
  • the control module controls the heating power or heating time of the electromagnetic heating coil. Until I 1 is equal to I 0 + ⁇ i.
  • the invention utilizes the physical characteristics of the temperature control layer to make the current value of the electromagnetic heating coil and the temperature value of the temperature control layer form a corresponding relationship, and further utilizes the corresponding relationship to control the heating temperature by detecting the current, and the control method has higher detection. Accuracy improves the accuracy of temperature control.
  • the invention detects the temperature value in the electromagnetic heating coil as the basis for judging the temperature, and eliminates additional components such as a temperature sensor.
  • the control method can be used together with the temperature control layer, and the temperature control layer and the electromagnetic heating coil can Mutual induction, at this time, the electrical parameter value in the electromagnetic heating coil can more accurately reflect the temperature of the temperature control layer, that is, by detecting the change of the electrical parameter of the electromagnetic heating coil, the heating temperature value of the measured object can be accurately detected, thereby Precise control of temperature can be achieved.
  • the patent preferably uses a temperature control layer material having a Curie point temperature between 30 degrees Celsius and 500 degrees Celsius, and can further control the temperature of the temperature control layer in the range of 30 degrees Celsius to 500 degrees Celsius.
  • This control method changes the traditional manual method.
  • the control method realizes the effect of automatic temperature control.
  • FIG. 1 is a schematic structural diagram of a circuit according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural diagram of a circuit according to Embodiment 2 of the present invention.
  • Figure 3 and Figure 4 are schematic diagrams showing the relationship between the operating current of the electromagnetic heating coil and the temperature of the temperature control layer.
  • the present invention relates to an electromagnetic heating system of an electromagnetic oven, comprising a first rectifier, an electromagnetic heating module, an IGBT, an IGBT driving module, a current detecting module and a control module, wherein: the input end of the rectifier DB1 is connected to a power source.
  • one output is connected to the input end of the electromagnetic heating module, the output end of the electromagnetic heating module is connected with the C end of the IGBT, the E end of the IGBT is connected with the input end of the current detecting module, and the G end of the IGBT and the IGBT driving module Connected, the output of the current detecting module is grounded and connected to the other output of the finisher DB1, and the control module is connected to the current detecting module.
  • the electromagnetic heating module includes a parallel electromagnetic heating coil and a capacitor C2.
  • the current detecting module includes a resistor R1 and a capacitor C1.
  • One end of the resistor R1 is connected to the E terminal of the IGBT, and the other end is grounded and connected to the output end of the rectifier DB1.
  • the capacitor C1 is connected in parallel with the resistor R1, and one end of the capacitor C1. It is connected to the E terminal of the IGBT and connected to the control module, and the other end is grounded and connected to the output of the rectifier DB1.
  • the electromagnetic heating system of the induction cooker further includes a temperature control layer capable of sensing an electromagnetic signal generated by the electromagnetic heating coil, and the temperature control layer is disposed above the electromagnetic heating coil.
  • the temperature control layer may be disposed at On the panel of the induction cooker, the panel is disposed above the electromagnetic heating coil, and the temperature control layer may also be disposed on the pot, such as the bottom of the pot or the body of the pot. When heating is required, the pot is placed on the panel of the induction cooker. on.
  • the temperature control layer is made of ferromagnetic or ferrimagnetic material, such as permalloy and precision alloy, and its magnetic permeability will suddenly drop to zero or close to zero at the Curie point.
  • the so-called permalloy is iron nickel. alloy.
  • the temperature control layer has a magnetic permeability of 2,000 to 200,000 H/m, and the temperature control layer has a specific resistance of 30 to 130 ⁇ cm.
  • the precision alloy material is preferably a precision alloy 4J36 (manufactured by Shanghai Kaiye Metal Products Co., Ltd.) or a precision alloy 4J32 (manufactured by Shanghai Kaiye Metal Products Co., Ltd.), and the thickness of the temperature control layer is preferably 0.1. Up to 3 mm, this embodiment is 1.5 mm.
  • the temperature control layer can be made into a whole pot or a part of the pot, and is combined with the pot body by riveting, welding, spraying, printing, and the like. Together.
  • the temperature control layer may be located on the upper surface of the panel or on the lower surface of the panel.
  • the temperature control layer may also be disposed on the panel. Between the lower surfaces.
  • the permalloy or precision alloy material preferably used in this embodiment has a Curie point temperature of between 30 degrees Celsius and 500 degrees Celsius, and further preferably has a Curie point temperature of between 70 degrees Celsius and 400 degrees Celsius or 150 degrees Celsius to 350 degrees Celsius.
  • the precision alloy material between, in terms of the kind of precision alloy material, the following alloy materials are preferably used in the present embodiment:
  • the temperature control layer can also be made of powdered or granular precision alloy material or permalloy material, and attached to the panel, that is, the precision alloy material or the permalloy material is made into powder or granules. Shaped and then composited on the panel by existing processes.
  • the permalloy is also called an iron-nickel alloy, and the content of iron is 35 to 70%, more preferably 63 to 67%, and the content of nickel is 30 to 65%, and more preferably 37 to 58%.
  • Iron-nickel alloys have high magnetic permeability and will collapse to near vacuum permeability at the Curie point.
  • the current detecting module in this embodiment includes a current transformer CT, a rectifier DB2, a resistor R1 and a capacitor C1, and a current transformer.
  • the first input end of the CT is connected to the E pole of the IGBT, the second input end is grounded and connected to the finisher DB1, the first input end of the rectifier DB2 is connected to the first output end of the current transformer, and the second input end of the rectifier DB2 Connected to the second output end of the current transformer CT, one end of the resistor R1 is connected to the first output end of the rectifier DB2, the other end of the resistor R1 is connected to the second output end of the rectifier DB2, one end of the capacitor C1 and one end of the resistor R1 Connected and connected to the control module, the other end of the capacitor C1 is grounded and connected to the other end of the resistor R1.
  • This embodiment is based on Embodiments 1 and 2,
  • An electromagnetic heating control method which provides the electromagnetic heating system of Embodiments 1 and 2, further comprising the following steps:
  • S1 sets the expected heating temperature value or the current value corresponding to the temperature value, which is recorded as T 0 ; there is a specific correspondence between the temperature value and the current value due to the temperature control, as shown in FIGS. 3 and 4 .
  • a certain temperature value corresponds to a specific current value.
  • a certain current value also corresponds to a specific temperature value. Therefore, there is an equivalent replacement relationship between the temperature value and the current value, and the temperature value and the current value are finally reflected. On the temperature value;
  • the S2 control module controls the heating of the electromagnetic heating coil and heats the temperature control layer
  • the S3 current detecting module detects the current parameter value in the electromagnetic heating coil, and records it as I 1 .
  • S4 converts I 1 into a corresponding temperature value, denoted as T 1 , and compares T 1 with T 0 + ⁇ t.
  • T 1 a corresponding temperature value
  • the control module controls the electromagnetic heating coil to continue heating, when T 1 ⁇
  • the electromagnetic heating coil stops heating or reduces the heating power; or
  • the control module controls the heating power or heating time of the electromagnetic heating coil. Until I 1 is equal to I 0 + ⁇ i.
  • the current value may also be a threshold value. Specifically, after the electromagnetic cooker is working, the electromagnetic heating coil starts to work and generates an electromagnetic signal, and at the same time, heating the temperature control layer is started, and the electromagnetic signal and the temperature control layer are started.
  • the effect is attenuated by the temperature loss of the temperature control layer, and the current in the electromagnetic heating coil changes with the temperature of the temperature control layer, and a specific correspondence is formed.
  • the current detecting module detects that the current in the electromagnetic heating coil is transmitted to the control module, and the control module compares the detected value of the current with the current value corresponding to the initially set current value or the set temperature value, when the detected current value When the value is greater than the initial set maximum value or less than the initial set minimum value, the control module will control the IGBT drive module to control the current of the electromagnetic heating coil by the PWM signal to be between the set maximum and minimum values.
  • the heating power or heating time of the electromagnetic heating coil may remain unchanged or fine-tuned within a certain range.

Abstract

一种电磁炉的电磁加热系统，包括第一整流器（DB1）、电磁加热模块、IGBT、IGBT驱动模块、电流检测模块和控制模块，其中：所述整流器（DB1）输入端与电源接口连接，一个输出端与电磁加热模块的输入端连接，所述电磁加热模块的输出端与IGBT的C端连接，IGBT的E端与电流检测模块的输入端连接，IGBT的G端与IGBT驱动模块连接，所述电流检测模块的输出端接地同时与整流器（DB1）的另一个输出端连接，所述控制模块与电流检测模块连接。通过检测电磁加热模块中电磁加热线圈的电流值来精确地控制加热温度。

Description

一种电磁炉的电磁加热系统及其控制方法 技术领域
本发明涉及厨具技术领域，更具体地，涉及一种电磁炉的电磁加热系统，同时还涉及一种电磁炉电磁加热系统的控制方法。
背景技术
烹饪器具比如电磁炉等已经普遍应用于家庭，电磁炉结构一般包括外壳、设于外壳上的面板、以及设于外壳和面板之间的电磁加热线圈和控制线路板，这种普通结构的电磁炉足以满足加热的需要，电磁炉开启后，电磁加热线圈通电并产生热量，通过面板传递给待加热的器具，比如锅具等。
但普通的电磁炉无法实现对温度的控制，当开启电磁炉后将一直处于加热状态，无法将加热温度控制在一个合理的范围内，为此，有些电磁炉上设置了温度传感器，所述温度传感器一般设置在靠近面板的位置，通过温度传感器可以检测面板温度，然后通过电路控制，将面板温度控制在一定范围内，这种方法虽然能够实现对温度的控制，但仍然存在很多不足，比如，温度传感器对温度的检测具有一定的滞后性，因此，其对温度的控制精度较低。
发明内容
本发明要解决的技术问题是克服现有技术的不足，提供一种能够方便实现温度控制的电磁炉电磁加热系统。
本发明还提供一种能够方便实现电磁炉电磁加热的控制方法。
为了解决上述技术问题，本发明采用的技术方案是：
本发明涉及一种电磁加热系统，包括第一整流器、电磁加热模块、IGBT、IGBT驱动模块、电流检测模块和控制模块，其中：所述整流器DB1输入端与电源接口连接，一个输出端与电磁加热模块的输入端连接，所述电磁加热模块的输出端与IGBT的C端连接，IGBT的E端与电流检测模块的输入端连接，IGBT的G端与IGBT驱动模块连接，所述电流检测模块的输出端接地同时与整理器DB1的另一个输出端 连接，所述控制模块与电流检测模块连接。
所述电磁加热模块包括并联的电磁加热线圈和电容C2。
所述电流检测模块包括电阻R1和电容C1，所述电阻R1的一端与IGBT的E端连接，另一端接地同时与整流器DB1的输出端连接，所述电容C1与电阻R1并联，电容C1的一端与IGBT的E端连接并与控制模块连接，另一端接地同时与整流器DB1的输出端连接。
所述电流检测模块包括电流互感器CT、整流器DB2、电阻R1和电容C1，电流互感器CT的第一输入端与IGBT的E极连接，第二输入端接地且与整理器DB1连接，整流器DB2的第一输入端与电流互感器的第一输出端连接，整流器DB2的第二输入端与电流互感器CT的第二输出端连接，电阻R1的一端与整流器DB2的第一输出端连接，电阻R1的另一端与整流器DB2的第二输出端连接，电容C1的一端与电阻R1的一端连接且与控制模块连接，电容C1另一端接地与电阻R1的另一端连接。
优选的，所述电磁加热模块包括能够感应电磁加热线圈所产生的电磁信号的控温层。所述控温层通常为铁磁性或亚铁磁性材料制成，比如坡莫合金、精密合金，其磁导率在居里点时，会突降至零或接近零，所述控温层的磁导率为2000～200000H/m，控温层的电阻率为30～130μΩ·cm。
优选的，所述控温层设于电磁加热模块的上方。具体来说，所述电磁炉包括面板，所述控温层设于面板上，或者，所述电磁炉上方设有锅具，所述控温层设于锅具上。
优选的，所述控温层由坡莫合金材料或精密合金材料制成。
优选的，所述坡莫合金材料或精密合金材料的居里点温度在30摄氏度至500摄氏度之间。优选为70摄氏度至400摄氏度之间，进一步优选为180摄氏度至350摄氏度之间。当控温层温度达到控温层居里点时，控温层磁导率将突降至接近零，其温度将停止升高。
更进一步的，所述精密合金材料为居里点温度在180摄氏度至230摄氏度之间的材料。例如精密合金4J36(上海凯冶金属制品有限 公司生产)或精密合金4J32(上海凯冶金属制品有限公司生产)。精密合金4J36是一种具有超低膨胀系数的特殊的低膨胀铁镍合金，其居里点为230摄氏度；精密合金4J32合金又称超因瓦(Super-Invar)合金，其居里点温度为220摄氏度。
经研究验证，能够适用于本专利的精密合金材料优选为标准号为GB/T15018-94、YB/T5239-2005、YB/T5262-93、YB/T5254-2011所列举的如下合金材料，其中标准号GB/T15018-94是指《中华人民共和国国家标准精密合金牌号》，标准号YB/T5254-2011是指《中华人民共和国黑色冶金行业标准》。
合金类型 合金牌号 居里点
铁锰合金 4J59 70
恒弹性合金 3J53 110
恒弹性合金 3J53Y 110
弹性合金 Ni44MoTiAl 120
恒弹性合金 3J58 130
弹性合金 3J54 130
弹性合金 3J58 130
弹性合金 3J59 150
非晶态软磁合金 (FeNiCo)78(SiB)22 150
弹性合金 3J53 155
弹性合金 3J61 160
弹性合金 3J62 165
精密合金 4J36 230
精密合金 4J32 220
表中弹性合金3J53的化学成分包括：
C元素含量不大于0.05％；
S元素的含量不大于0.020％；
P元素的含量不大于0.020％；
Mn元素的含量不大于0.80％；
Si元素的含量不大于0.80％；
Ni元素的含量为41.5％～43.0％；
Cr元素的含量为5.2％～5.8％；
Ti元素的含量为2.3％～2.7％；
Al元素的含量为0.5％～0.8％；
余量为Fe元素。
弹性合金3J58的化学成分包括：
C元素含量不大于0.05％；
S元素的含量不大于0.020％；
P元素的含量不大于0.020％；
Mn元素的含量不大于0.80％；
Si元素的含量不大于0.80％；
Ni元素的含量为43.0％～43.6％；
Cr元素的含量为5.2％～5.6％；
Ti元素的含量为2.3％～2.7％；
Al元素的含量为0.5％～0.8％；
余量为Fe元素。
精密合金4J32的化学成分包括：
C元素含量不大于0.05％；
S元素的含量不大于0.020％；
P元素的含量不大于0.020％；
Mn元素的的含量为0.20％～0.60％；
Si元素的含量不大于0.20％；
Ni元素的含量为31.5％～33.0％；
Co元素的含量为3.2％～4.2％；
Cu元素的含量为0.4％～0.8％；
余量为Fe元素。
精密合金4J36的化学成分包括：
C元素含量不大于0.05％；
S元素的含量不大于0.020％；
P元素的含量不大于0.020％；
Mn元素的的含量为0.20％～0.60％；
Si元素的含量不大于0.30％；
Ni元素的含量为35.0％～37.0％；
余量为Fe元素。
以上合金材料可由上海凯冶金属制品有限公司生产提供或通过其他公共销售渠道获得。
除此之外，所述坡莫合金中铁的含量为35～70％，镍的含量30～65％。
坡莫合金中铁的含量为35～70％，镍的含量30～65％。
本发明还提供了一种电磁加热控制方法，首先提供上述的电磁加热系统，并包括如下步骤：
S1设定预期加热温度值或或与温度值对应的电流值，记为T0；由于在控温的作用下，温度值与电流值之间存在特定的对应关系，某一温度值对应特定的电流值，同理，某一电流值也对应特定的温度值，因此，温度值和电流值存在等同替换关系，无论设定温度值还是电流值，最终都能够反映在温度值上；
S2控制模块控制电磁加热线圈加热，并对控温层加热；
S3电流检测模块检测电磁加热线圈中的电流参数值，记为I1，
S4将I1变换成对应的温度值，记为T1，将T1与T0+Δt进行比较，当T1＜T0+Δt时，控制模块控制电磁加热线圈继续加热，当T1≥T0+Δt时，电磁加热线圈停止加热或降低加热功率；或者
将T0变换成对应的电流值，记为I0，将I1与I0+Δi进行比较，当I1与I0+Δi不相等时，控制模块控制电磁加热线圈的加热功率或加热时间直至I1与I0+Δi相等。
所述T0为阈值，即T0＝[T低-T高]，步骤S4中，当T1＜T低+Δt时，控制模块控制电磁加热线圈继续加热，当T1≥T高+Δt时，电磁加热线圈停止加热或降低加热功率。
优选的，0≤Δi≤0.7A，0≤Δt≤7℃。
本发明利用控温层的物理特性，使电磁加热线圈的电流值与控温层温度值形成对应关系，进而利用这种对应关系，通过检测电流控制加热温度，这种控制方法具有更高的检测精度，提高了温度控制的精确性。
与现有技术相比，本发明的有益效果是：
本发明通过检测电磁加热线圈中的电流值来作为判断温度大小的依据，省去了温度传感器等额外部件，另外，该控制方法能够和控温层一起配合使用，控温层和电磁加热线圈能够相互感应，此时电磁加热线圈中的电参数值更能够精确地反应控温层的温度，也就是说，通过检测电磁加热线圈的电参数变化能够精确地检测被测物体的加热温度值，从而可以实现对温度的精确控制。
本专利优选使用居里点温度在30摄氏度至500摄氏度之间的控温层材料，能够进一步在30摄氏度至500摄氏度范围内实现对控温层温度的控制，这种控制方法改变了传统的手动控制方式，实现了自动控温的效果。
附图说明
图1为本发明实施例1的电路结构示意图；
图2为本发明实施例2的电路结构示意图。
图3、图4为电磁加热线圈工作电流与控温层温度对应关系原理图。
具体实施方式
下面结合具体实施方式对本发明作进一步的说明。其中，附图仅用于示例性说明，表示的仅是示意图，而非实物图，不能理解为对本专利的限制；为了更好地说明本发明的实施例，附图某些部件会有省 略、放大或缩小，并不代表实际产品的尺寸；对本领域技术人员来说，附图中某些公知结构及其说明可能省略是可以理解的。
本发明实施例的附图中相同或相似的标号对应相同或相似的部件；在本发明的描述中，需要理解的是，若有术语“上”、“下”、“左”、“右”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此附图中描述位置关系的用语仅用于示例性说明，不能理解为对本专利的限制，对于本领域的普通技术人员而言，可以根据具体情况理解上述术语的具体含义。
实施例1
如图1所示，本发明涉及一种电磁炉的电磁加热系统，包括第一整流器、电磁加热模块、IGBT、IGBT驱动模块、电流检测模块和控制模块，其中：所述整流器DB1输入端与电源接口连接，一个输出端与电磁加热模块的输入端连接，所述电磁加热模块的输出端与IGBT的C端连接，IGBT的E端与电流检测模块的输入端连接，IGBT的G端与IGBT驱动模块连接，所述电流检测模块的输出端接地同时与整理器DB1的另一个输出端连接，所述控制模块与电流检测模块连接。
所述电磁加热模块包括并联的电磁加热线圈和电容C2。
所述电流检测模块包括电阻R1和电容C1，所述电阻R1的一端与IGBT的E端连接，另一端接地同时与整流器DB1的输出端连接，所述电容C1与电阻R1并联，电容C1的一端与IGBT的E端连接并与控制模块连接，另一端接地同时与整流器DB1的输出端连接。
所述电磁炉的电磁加热系统还包括能够感应电磁加热线圈所产生的电磁信号的控温层，所述控温层设于电磁加热线圈的上方，具体来说，所述控温层既可以设于电磁炉的面板上，所述面板设于电磁加热线圈的上方，所述控温层也可以设于锅具上，比如锅底或锅身上，当需要加热时，将所述锅具放于电磁炉面板上。
所述控温层为铁磁性或亚铁磁性材料制成，比如坡莫合金、精密合金，其磁导率在居里点时，会突降至零或接近零，所谓坡莫合金即铁镍合金。所述控温层的磁导率为2000～200000H/m，控温层的电阻率为30～130μΩ·cm。
就本实施例而言，该精密合金材料优选为精密合金4J36(上海凯冶金属制品有限公司生产)或精密合金4J32(上海凯冶金属制品有限公司生产)，所述控温层厚度优选为0.1至3毫米，本实施例为1.5毫米。当控温层设于锅具上时，所述控温层既可以做成锅具整体，也可以作为锅具的一部分，通过铆接、焊接、熔射、印刷等方法使其与锅具主体复合在一起。当控温层设于电磁炉面板上时，所述控温层既可以位于面板上表面，也可以位于面板下表面，当面板为复合式结构时，所述控温层也可以设于面板上、下表面之间。
本实施例优选使用的坡莫合金或精密合金材料的居里点温度在30摄氏度至500摄氏度之间精密合金材料，进一步优选居里点温度在70摄氏度至400摄氏度之间或者150摄氏度至350摄氏度之间的精密合金材料，就精密合金材料的种类而言，本实施优选使用如下合金材料：
Figure PCTCN2017092261-appb-000001
Figure PCTCN2017092261-appb-000002
控温层除了片状结构外，也可以由粉末状或颗粒状的精密合金材料或坡莫合金材料制成，并附着在面板上，即将精密合金材料或坡莫合金材料制作成粉末状或颗粒状，然后通过现有工艺复合在面板上。
所谓坡莫合金又称铁镍合金，其中铁的含量为35～70％，进一步优选为63～67％，镍的含量30～65％，进一步优选为37～58％。铁镍合金具有高磁导率，且在居里点会突降至接近真空磁导率。
实施例2
本实施例在实施例1的基础上改变了电流检测模块的设置，如图2所示，本实施例中的电流检测模块包括电流互感器CT、整流器DB2、电阻R1和电容C1，电流互感器CT的第一输入端与IGBT的E极连接，第二输入端接地且与整理器DB1连接，整流器DB2的第一输入端与电流互感器的第一输出端连接，整流器DB2的第二输入端与电流互感器CT的第二输出端连接，电阻R1的一端与整流器DB2的第一输出端连接，电阻R1的另一端与整流器DB2的第二输出端连接，电容C1的一端与电阻R1的一端连接且与控制模块连接，电容C1另一端接地与电阻R1的另一端连接。
实施例3
本实施例在实施例1和2的基础上，
一种电磁加热控制方法，在提供实施例1、2所述电磁加热系统的基础上，还包括如下步骤：
S1设定预期加热温度值或或与温度值对应的电流值，记为T0；由于在控温的作用下，温度值与电流值之间存在特定的对应关系，如图3、4所示，某一温度值对应特定的电流值，同理，某一电流值也对应特定的温度值，因此，温度值和电流值存在等同替换关系，无论设定温度值还是电流值，最终都能够反映在温度值上；
S2控制模块控制电磁加热线圈加热，并对控温层加热；
S3电流检测模块检测电磁加热线圈中的电流参数值，记为I1，
S4将I1变换成对应的温度值，记为T1，将T1与T0+Δt进行比较，当T1＜T0+Δt时，控制模块控制电磁加热线圈继续加热，当T1≥T0+Δt时，电磁加热线圈停止加热或降低加热功率；或者
将T0变换成对应的电流值，记为I0，将I1与I0+Δi进行比较，当I1与I0+Δi不相等时，控制模块控制电磁加热线圈的加热功率或加热时间直至I1与I0+Δi相等。
优选的，所述T0为阈值，即T0＝[T低-T高]，步骤S4中，当T1＜T低+Δt时，控制模块控制电磁加热线圈继续加热，当T1≥T高+Δt时，电磁加热线圈停止加热或降低加热功率。同理，所述电流值也可以为阈值，具体来说，电磁灶工作后，电磁加热线圈开始工作并产生电磁信号，与此同时开始对控温层进行加热，所述电磁信号与控温层作用并被控温层损耗衰减，电磁加热线圈中的电流随控温层温度的变化而变化，并形成特定对应关系。电流检测模块检测到电磁加热线圈中的电流传输给控制模块，控制模块将电流的检测值与初始设定的电流值或设定的温度值所对应的电流值进行比较，当检测到的电流值大于初始设定的最大值或小于初始设定的最小值时，控制模块将通过控制IGBT驱动模块，通过PWM信号控制电磁加热线圈的电流大小使其位于设定的最高和最低值之间，当检测到的电参数在设定的最高和最低值之间时，电磁加热线圈的加热功率或加热时间可以保持不变或在一定范围内微调。
优选的，0≤Δi≤0.7A，0≤Δt≤7℃。
显然，本发明的上述实施例仅仅是为清楚地说明本发明所作的举例，而并非是对本发明的实施方式的限定。对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明权利要求的保护范围之内。

Claims (14)

  1. 一种电磁炉的电磁加热系统，包括第一整流器、电磁加热模块、IGBT、IGBT驱动模块、电流检测模块和控制模块，其中：
    所述整流器DB1输入端与电源接口连接，一个输出端与电磁加热模块的输入端连接，所述电磁加热模块的输出端与IGBT的C端连接，IGBT的E端与电流检测模块的输入端连接，IGBT的G端与IGBT驱动模块连接，所述电流检测模块的输出端接地同时与整理器DB1的另一个输出端连接，所述控制模块与电流检测模块连接。
  2. 根据权利要求1所述的电磁加热系统，其特征在于，所述电磁加热模块包括并联的电磁加热线圈和电容C2。
  3. 根据权利要求1所述的电磁加热系统，其特征在于，所述电流检测模块包括电阻R1和电容C1，所述电阻R1的一端与IGBT的E端连接，另一端接地同时与整流器DB1的输出端连接，所述电容C1与电阻R1并联，电容C1的一端与IGBT的E端连接并与控制模块连接，另一端接地同时与整流器DB1的输出端连接。
  4. 根据权利要求1所述的电磁加热系统，其特征在于，所述电流检测模块包括电流互感器CT、整流器DB2、电阻R1和电容C1，电流互感器CT的第一输入端与IGBT的E极连接，第二输入端接地且与整理器DB1连接，整流器DB2的第一输入端与电流互感器的第一输出端连接，整流器DB2的第二输入端与电流互感器CT的第二输出端连接，电阻R1的一端与整流器DB2的第一输出端连接，电阻R1的另一端与整流器DB2的第二输出端连接，电容C1的一端与电阻R1的一端连接且与控制模块连接，电容C1另一端接地与电阻R1的另一端连接。
  5. 根据权利要求1至4任一所述的电磁加热系统，其特征在于，所述电磁加热模块的上方或侧方还设有能够感应所述电磁加热模块产生的电磁信号的控温层。
  6. 根据权利要求5所述的电磁加热系统，其特征在于，所述电磁加热模块的上方或侧方还设有面板，所述面板由控温层组成，或者，所述控温层组成面板的一部分且复合于面板中。
  7. 根据权利要求5所述的电磁加热系统，其特征在于，所述电磁加热系统上方还设有锅具，所述控温层设于锅具上。
  8. 根据权利要求5所述的电磁加热系统，其特征在于，所述控温层由坡莫合金材料或精密合金材料制成。
  9. 根据权利要求8所述的电磁加热系统，其特征在于，所述坡莫合金材料或精密合金材料的居里点温度在30摄氏度至500摄氏度之间。
  10. 根据权利要求8所述的电磁加热系统，其特征在于，所述精密合金材料为精密合金4J36、精密合金4J32、铁锰合金4J59、恒弹性合金3J53、恒弹性合金3J53Y、恒弹性合金3J58、弹性合金3J54、弹性合金3J58、弹性合金3J59、弹性合金3J53、弹性合金3J61、弹性合金3J62、弹性合金Ni44MoTiAl、精密合金4J36、精密合金4J32或非晶态软磁合金(FeNiCo)78(SiB)22。
  11. 根据权利要求8所述的电磁加热系统，其特征在于，所述坡莫合金中铁的含量为35～70％，镍的含量30～65％。
  12. 一种电磁加热控制方法，其特征在于，提供权利要求5至11任一所述的电磁加热系统，并包括如下步骤：
    S1设定预期加热温度值或与温度值对应的电流值，记为T0；
    S2控制模块控制电磁加热线圈加热，并对控温层加热；
    S3电流检测模块检测电磁加热线圈中的电流参数值，记为I1，
    S4将I1变换成对应的温度值，记为T1，将T1与T0+Δt进行比较，当T1＜T0+Δt时，控制模块控制电磁加热线圈继续加热，当T1≥T0+Δt时，电磁加热线圈停止加热或降低加热功率；或者
    将T0变换成对应的电流值，记为I0，将I1与I0+Δi进行比较，当I1与I0+Δi不相等时，控制模块控制电磁加热线圈的加热功率或加热时间直至I1与I0+Δi相等。
  13. 根据权利要求12所述的控制方法，其特征在于，所述T0为阈值，即T0＝[T低-T高]，步骤S4中，当T1＜T低+Δt时，控制模块控制电磁加热线圈继续加热，当T1≥T高+Δt时，电磁加热线圈停止加热或降低加热功率。
  14. 根据权利要求12所述的控制方法，其特征在于，0≤Δi≤0.7A，0≤Δt≤7℃。
PCT/CN2017/092261 2017-07-07 2017-07-07 一种电磁炉的电磁加热系统及其控制方法 WO2019006753A1 (zh)

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