WO2019010642A1 - 一种电磁灶控制电路及电磁灶 - Google Patents

一种电磁灶控制电路及电磁灶 Download PDF

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Publication number
WO2019010642A1
WO2019010642A1 PCT/CN2017/092605 CN2017092605W WO2019010642A1 WO 2019010642 A1 WO2019010642 A1 WO 2019010642A1 CN 2017092605 W CN2017092605 W CN 2017092605W WO 2019010642 A1 WO2019010642 A1 WO 2019010642A1
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WIPO (PCT)
Prior art keywords
control circuit
electromagnetic cooker
control unit
igbts
electromagnetic
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PCT/CN2017/092605
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English (en)
French (fr)
Inventor
王勇亮
杨振
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深圳拓邦股份有限公司
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Priority to PCT/CN2017/092605 priority Critical patent/WO2019010642A1/zh
Publication of WO2019010642A1 publication Critical patent/WO2019010642A1/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

Definitions

  • the present invention belongs to the field of kitchen appliances, and in particular, to an electromagnetic oven control circuit and an electromagnetic cooker.
  • the electromagnetic cooker uses an alternating current to generate an alternating magnetic field whose direction is constantly changing through the induction coil, and a vortex current will appear inside the conductor in the alternating magnetic field, so that the heat is directly in the pot without an open flame or conduction heating.
  • the bottom is produced, so the thermal efficiency has been greatly improved. It is widely used in kitchens in home kitchens and various commercial places, and has a tendency to replace traditional open flame stoves.
  • multi-cooker induction cooktops are equipped in many commercial kitchens and some home kitchens.
  • the multi-cooker induction cooktop has multiple LC resonant circuits, and each LC resonant circuit includes a heating coil. Simultaneously heat multiple pots to cook multiple dishes at the same time.
  • the half-bridge electromagnetic cooker usually controls the switching of the IGBT (insulated gate bipolar transistor) by the PWM (Pulse Width Modulation) function of the control unit (for example, CPU, MPU, etc.) to achieve AC resonance work, it is required Using a pair of PWM pins and a pair of IGBTs, in the research and practice of the prior art, the inventors of the present invention found that the prior art has the following problems.
  • Each of the LC resonant circuits of the existing multi-cooker induction cooktops is composed of A pair of PWM pins and a pair of IGBTs are controlled. At present, the price of IGBT components with better quality is more than 10 yuan.
  • the component cost of IGBTs is increased by more than 20 yuan, and when the LC resonant circuit If the number is large, the number of PWM pins of the general control unit cannot meet the demand, and a higher-end or customized control unit is needed, which further increases the production cost, and the production cost of the multi-cooker electromagnetic cooker is relatively high.
  • the present invention provides an electromagnetic cooker control circuit, which aims to solve the problem of high production cost of the existing multi-cooker electromagnetic cooker.
  • an electromagnetic cooker control circuit comprising: a control unit;
  • each of the LC resonant circuits is connected in series with a switching device controlled by the control unit to be turned on and off.
  • the switching device is a relay.
  • the electromagnetic oven control circuit further includes a rectifying and filtering module coupled between the power input end and the IGBT.
  • a current transformer is further connected in series between the output end of the half bridge structure and the LC resonant circuit.
  • the secondary side of the current transformer is coupled with an overcurrent detecting unit and a current zero crossing detecting unit.
  • a secondary side of the current transformer is further coupled to a voltage detecting unit.
  • the voltage detecting unit comprises:
  • a rectifying module sequentially coupled between the secondary side of the current transformer and the voltage detecting end of the control unit
  • the loop module includes at least one resistor.
  • the capacitor of the LC resonant circuit is connected in parallel with a voltage sampling module.
  • the present invention also provides an electromagnetic cooktop comprising the electromagnetic cooker control circuit according to any one of claims 1 to 9.
  • the present invention provides an electromagnetic cooker control circuit and an electromagnetic cooker, comprising a control unit, two IGBTs, at least two LC resonant circuits, and a switching device connected in series on each LC resonant circuit.
  • the high-frequency alternating current is formed by controlling the on-off of the IGBT by the PWM function of the control unit, so that the heating coil of the LC resonant circuit generates a high-frequency magnetic field, and the pot on the heating coil has a vortex heating effect, and is connected in series by
  • the switching devices on each LC resonant circuit independently control the on and off of each LC resonant circuit.
  • a plurality of LC resonance circuits of the multi-cavity electromagnetic cooker are controlled in a case where only a pair of PWM pins and a pair of IGBTs are used, which greatly reduces the number of IGBTs used and the number of PWM pins of the control unit. . and Moreover, due to the low price of the Shaoguan device, the increase in the number of the off-the-shelf devices has little impact on the cost, and ultimately the overall cost of the multi-cooker induction cooktop is greatly reduced, solving the problem of the high production cost of the existing multi-cooker induction cooktop. .
  • 1 is a control circuit of an electromagnetic cooker provided by an embodiment of the present invention
  • 3 is another preferred electromagnetic cooker control circuit according to an embodiment of the present invention.
  • FIG. 4 is a circuit diagram of an overcurrent detecting unit, a current zero crossing detecting unit, and a voltage detecting unit according to an embodiment of the present invention
  • FIG. 5 is still another electromagnetic cooker control circuit according to an embodiment of the present invention.
  • the invention provides an electromagnetic cooker control circuit and an electromagnetic cooker, comprising a control unit, two IGBTs, at least two LC resonant circuits, and a switching device connected in series on each LC resonant circuit.
  • the high-frequency alternating current is formed by controlling the on-off of the IGBT by the PWM function of the control unit, so that the heating coil of the LC resonant circuit generates a high-frequency magnetic field, and the pot on the heating coil has a vortex heating effect, and is connected in series by
  • the switching devices on each LC resonant circuit independently control the on and off of each LC resonant circuit.
  • a plurality of LC resonance circuits of the multi-cavity electromagnetic cooker are controlled in a case where only a pair of PWM pins and a pair of IGBTs are used, which greatly reduces the number of IGBTs used and the number of PWM pins of the control unit. .
  • the increase in the number of the off-the-shelf devices has little impact on the cost, and ultimately the overall cost of the multi-cavity electromagnetic cooker is greatly reduced, thereby solving the problem of high production cost of the existing multi-cooker electromagnetic cooker. .
  • an electromagnetic cooker control circuit includes: a control unit (not shown), two IGBTs (S1, S2), and three LC resonant circuits, wherein each Each of the LC resonant circuits There is a switching device connected in series (the first switching device, the second switching device, and the third switching device).
  • Two IGBTs are coupled to the control unit to form a half bridge structure, and the gates of the two IGBTs are respectively connected to the two pairs of PWM pins of the control unit, so that the control unit can control the communication of the two IGBTs.
  • a switching device is connected in series on each LC resonant circuit, and the control terminal of the switching device can be connected with the control unit or other control device, thereby enabling control.
  • the on/off control of the device is controlled to control the on and off of the LC resonant circuit, and individual control of the operating state of each LC resonant circuit is achieved.
  • the control unit may use STM32K 0 series MCU of STMicroelectronics, or other control chip with similar functions, or other MCU, CPU, etc., which can meet the needs of the control circuit of the electromagnetic cooker, and may be selected according to actual conditions, specifically not Make restrictions.
  • L1, L2, and L3 in FIG. 1 are heating coils of three LC resonant circuits, respectively, for generating a high-frequency magnetic field, causing eddy currents on the pots placed thereon to achieve heating effect.
  • R1, R2, and R3 in Fig. 1 are the equivalent loads of the cookware placed on the heating reel, respectively.
  • the electromagnetic oven control circuit controls multiple LC resonant circuits of the multi-cavity electromagnetic cooker with only a pair of PWM pins and a pair of IGBTs, thereby greatly reducing the use of the IGBT.
  • the number and requirements for the number of control unit PWM pins due to the low price of the Shaoguan device, the increase in the number of the off-the-shelf devices has little impact on the cost, and ultimately the overall cost of the multi-cavity electromagnetic cooker is greatly reduced, thereby solving the problem of high production cost of the existing multi-cooker electromagnetic cooker. .
  • the switching devices are all relays (Kl, ⁇ 2, ⁇ 3), and the relay has good pressure resistance performance, high stability, and low price, and will not It has a significant impact on the cost of the induction cooker.
  • the electromagnetic oven control circuit further includes a rectification and filtering module, and the rectification and filtering module is composed of a rectifying diode or a rectifier bridge stack, and an LC filter circuit.
  • the rectifier diode or rectifier bridge stack converts the input AC into a DC voltage that changes in voltage
  • the LC filter circuit converts the DC current of the voltage into a voltage-stabilized DC.
  • a current transformer TL1 is further connected in series between the output end of the half-bridge structure formed by the two IGBTs and the LC resonant circuit.
  • the secondary side 1 ⁇ 1_ of the current transformer TL1 is coupled with an overcurrent detecting unit, a current zero-crossing detecting unit and a voltage detecting unit.
  • the overcurrent detecting unit is configured to detect a current flowing through, and when the current is greater than a preset threshold, the control unit control circuit stops working to avoid circuit damage caused by excessive current.
  • the current zero-crossing detecting unit is for detecting a current flowing through the current transformer TL1. Since the electromagnetic cooker control circuit is in operation, the control unit controls the two IGBTs to always have one conduction, the other is broken, and the turned-on and the off-voltage IGBTs are repeatedly switched to form a high-frequency alternating current, if in the current transformer TL1 When there is a current flowing through the switch, there will be a problem that the current flowing through the IGBT collides with the reverse current to cause a short circuit, which is very likely to cause damage to the IGBT. Therefore, when the current zero-crossing detecting unit detects the current through the current transformer The current of TL1 is zero, and the control unit controls the switching of the two IGBTs to avoid the problem.
  • the voltage detecting unit is configured to detect a voltage on the LC resonant circuit, and when the voltage is greater than a preset threshold, the control unit control circuit stops working to avoid damage caused by excessive voltage.
  • the control unit control circuit stops working to avoid damage caused by excessive voltage.
  • some of the heating coils may maintain the original LC resonance frequency oscillation, which causes the heating coil to generate no-load high voltage.
  • the high voltage can be Up to 1550V.
  • the resonant current also increases, and the current flowing through the primary side of the current transformer TL1, TL1_C, naturally increases.
  • the no-load high voltage can be detected by the current flowing through the current transformer TL1, and when the no-load high voltage occurs, the control unit control circuit stops working to avoid circuit damage. Since the current flowing through the secondary side TL1_A of the current transformer TL1 is much smaller than the current flowing through the primary side TL1_C, the voltage detecting unit does not need to use components with high voltage resistance and high current resistance, thereby reducing the cost.
  • the voltage detecting unit includes: a rectifying module, a loop module, and a filtering module, and the three modules are sequentially coupled between the secondary side TL1_A of the current transformer TL1 and the voltage detecting end of the control unit.
  • the rectifier module is configured to convert the alternating current signal flowing through the secondary side TL1_A into a half-wavelength direct current signal
  • the loop module converts the half-waveform direct current signal into a half-waveform voltage signal
  • the filtered signal is the half-waveform voltage.
  • the signal is converted into a voltage signal with a gentle waveform, so that the voltage detecting end of the control unit can obtain the voltage signal, and the no-load current is detected by detecting the voltage value of the voltage signal.
  • the control unit control circuit stops working, thereby avoiding circuit damage caused by the control voltage.
  • the loop module includes at least one resistor.
  • the loop module is composed of a plurality of resistors, which are connected in series and in parallel with each other to form a resistor group, and the voltage drop formed by the current flowing through the resistor group ⁇ To convert the current signal into a voltage signal.
  • a voltage sampling module is connected in parallel across a capacitor of the LC resonant circuit, and the voltage sampling module adopts a partial voltage sampling method for detecting LC resonance.
  • the voltage sampling module includes two resistors, and a sampling end is connected between the two resistors for connecting with the voltage detecting end of the control unit to transmit the voltage sampling signal to the control unit, but the voltage value is greater than the pre- With the threshold ⁇ , the control unit control circuit stops working to avoid damage to the circuit caused by high voltage.
  • the voltage sampling module does not necessarily use two resistors, you can also use three or more resistors, you do not have to use resistor divider, you can also use capacitor divider method, as long as it can be tested by partial pressure sampling The voltage signal can be.
  • An embodiment of the present invention further provides an electromagnetic cooker comprising any of the above-mentioned electromagnetic cooker control circuits in the above embodiments.
  • the invention provides an electromagnetic cooker control circuit and an electromagnetic cooker, comprising a control unit, two IGBTs, at least two LC resonant circuits, and a switching device connected in series on each LC resonant circuit.
  • the high-frequency alternating current is formed by controlling the on-off of the IGBT by the PWM function of the control unit, so that the heating coil of the LC resonant circuit generates a high-frequency magnetic field, and the pot on the heating coil has a vortex heating effect, and is connected in series by
  • the switching devices on each LC resonant circuit independently control the on and off of each LC resonant circuit.
  • a plurality of LC resonance circuits of the multi-cavity electromagnetic cooker are controlled in a case where only a pair of PWM pins and a pair of IGBTs are used, which greatly reduces the number of IGBTs used and the number of PWM pins of the control unit. .
  • the increase in the number of the off-the-shelf devices has little impact on the cost, and ultimately the overall cost of the multi-cavity electromagnetic cooker is greatly reduced, thereby solving the problem of high production cost of the existing multi-cooker electromagnetic cooker. .

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Inverter Devices (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

一种电磁灶控制电路及电磁灶，包括控制单元、两个IGBT（S1、S2）、至少两个LC谐振回路，以及串接在每个LC谐振回路上的开关器件。通过控制单元的PWM功能控制IGBT（S1、S2）的通断来形成高频交流电，使得LC谐振回路的加热线盘（L1-L3）产生高频磁场，对置于加热线盘（L1-L3）上的锅具产生涡流加热作用，并通过串接在每个LC谐振回路上的开关器件独立控制每个LC谐振回路的通断。实现了在仅使用一对PWM管脚和一对IGBT（S1、S2）的情况下对多灶头电磁灶的多个LC谐振回路进行控制，大幅降低了IGBT的使用数量和对控制单元PWM管脚数量的要求。并且，由于开关器件价格低廉，最终可使得多灶头电磁灶的整体成本大幅降低，解决了现有的多灶头电磁灶生产成本较高的问题。

Description

发明名称：一种电磁灶控制电路及电磁灶
技术领域
[0001] 本发明属于厨房电器领域， 尤其涉及一种电磁灶控制电路及电磁灶。
背景技术
[0002] 电磁灶利用交变电流通过感应线圈产生方向不断改变的交变磁场， 处于交变磁 场中的导体的内部将会出现涡旋电流， 从而无需明火或传导式加热而让热直接 在锅底产生， 因此热效率得到了极大的提高， 广泛应用于家庭厨房和各种商业 场所的厨房中， 具有替代传统明火灶的趋势。 除基本的单灶头电磁灶外， 在很 多商用厨房及部分家庭厨房中都配备有多灶头电磁灶， 多灶头电磁灶具有多个 L C谐振回路， 每个 LC谐振回路包括一个加热线盘， 从而可以同吋加热多个锅具以 便同吋烹饪多道菜肴。
[0003] 由于半桥电磁灶通常是通过控制单元 （例如 CPU、 MPU等） 的 PWM (脉冲宽 度调制） 功能控制 IGBT (绝缘栅双极型晶体管） 的通断来实现交流谐振工作的 目的， 需要使用一对 PWM管脚和一对 IGBT, 在对现有技术的研究和实践中， 本发明的发明人发现现有技术存在以下问题， 现有的多灶头电磁灶的每一个 LC 谐振回路都由一对 PWM管脚和一对 IGBT进行控制， 而目前质量稍好的 IGBT元 件单价在 10元以上， 每增加一个 LC谐振回路， 仅 IGBT的元件成本就要增加 20元 以上， 并且当 LC谐振回路数量较多吋， 一般的控制单元的 PWM管脚数量也无法 满足需求， 需要采用更高端的或定制的控制单元， 进一步使得生产成本升高， 使得多灶头电磁灶生产成本较高。
技术问题
[0004] 本发明提供一种电磁灶控制电路， 旨在解决现有的多灶头电磁灶生产成本较高 的问题。
问题的解决方案
技术解决方案
[0005] 本发明是这样实现的， 一种电磁灶控制电路， 包括： [0006] 控制单元；
[0007] 与所述控制单元耦接， 以形成一半桥结构的两 IGBT;
[0008] 至少两个 LC谐振回路， 所述 LC谐振回路均串接于所述半桥结构的输出端；
[0009] 其中， 每个所述 LC谐振回路上串接有一个由所述控制单元控制通断的幵关器 件。
[0010] 优选的， 所述幵关器件为继电器。
[0011] 优选的， 所述电磁灶控制电路还包括一耦接于电源输入端及所述 IGBT之间的 整流滤波模块。
[0012] 优选的， 所述半桥结构的输出端与所述 LC谐振回路之间还串接有一电流互感 器。
[0013] 优选的， 所述电流互感器的二次侧耦接有过流检测单元及电流过零检测单元。
[0014] 优选的， 所述电流互感器的二次侧还耦接有一电压检测单元。
[0015] 优选的， 所述电压检测单元包括：
[0016] 依次耦接于所述电流互感器的二次侧及控制单元的电压检测端之间的整流模块
、 回路模块和滤波模块。
[0017] 优选的， 所述回路模块包括至少一个电阻。
[0018] 优选的， 所述 LC谐振回路的电容并联有一电压采样模块。
[0019] 本发明还提供一种电磁灶， 所述电磁灶包含权利要求 1至 9任一项所述的电磁灶 控制电路。
发明的有益效果
有益效果
[0020] 本发明提供的一种电磁灶控制电路及电磁灶， 包括控制单元、 两个 IGBT、 至 少两个 LC谐振回路， 以及串接在每个 LC谐振回路上的幵关器件。 通过控制单元 的 PWM功能控制 IGBT的通断来形成高频交流电， 使得 LC谐振回路的加热线盘 产生高频磁场， 对置于加热线盘上的锅具产生涡流加热作用， 并通过串接在每 个 LC谐振回路上的幵关器件独立控制每个 LC谐振回路的通断。 从而， 实现了在 仅使用一对 PWM管脚和一对 IGBT的情况下对多灶头电磁灶的多个 LC谐振回路 进行控制， 大幅降低了 IGBT的使用数量和对控制单元 PWM管脚数量的要求。 并 且， 由于幵关器件价格低廉， 增加幵关器件的数量对成本的影响很小， 最终可 使得多灶头电磁灶的整体成本大幅降低， 解决了现有的多灶头电磁灶生产成本 较高的问题。
对附图的简要说明
附图说明
[0021] 图 1是本发明实施例提供的一种电磁灶控制电路；
[0022] 图 2是本发明实施例提供一种优选的电磁灶控制电路；
[0023] 图 3是本发明实施例提供另一种优选的电磁灶控制电路；
[0024] 图 4是本发明实施例提供一种过流检测单元、 电流过零检测单元及电压检测单 元的电路图；
[0025] 图 5是本发明实施例提供的再一种电磁灶控制电路。
本发明的实施方式
[0026] 为了使本发明的目的、 技术方案及优点更加清楚明白， 以下结合附图及实施例 ， 对本发明进行进一步详细说明。 应当理解， 此处所描述的具体实施例仅仅用 以解释本发明， 并不用于限定本发明。
[0027] 本发明提供的一种电磁灶控制电路及电磁灶， 包括控制单元、 两个 IGBT、 至 少两个 LC谐振回路， 以及串接在每个 LC谐振回路上的幵关器件。 通过控制单元 的 PWM功能控制 IGBT的通断来形成高频交流电， 使得 LC谐振回路的加热线盘 产生高频磁场， 对置于加热线盘上的锅具产生涡流加热作用， 并通过串接在每 个 LC谐振回路上的幵关器件独立控制每个 LC谐振回路的通断。 从而， 实现了在 仅使用一对 PWM管脚和一对 IGBT的情况下对多灶头电磁灶的多个 LC谐振回路 进行控制， 大幅降低了 IGBT的使用数量和对控制单元 PWM管脚数量的要求。 并 且， 由于幵关器件价格低廉， 增加幵关器件的数量对成本的影响很小， 最终可 使得多灶头电磁灶的整体成本大幅降低， 解决了现有的多灶头电磁灶生产成本 较高的问题。
[0028] 如图 1所示， 在本发明实施例中， 一种电磁灶控制电路包括： 控制单元 （未图 示） 、 两个 IGBT (Sl、 S2) 、 三个 LC谐振回路， 其中， 每个 LC谐振回路上各 串接有一个幵关器件 （第一幵关器件、 第二幵关器件、 第三幵关器件） 。
[0029] 两个 IGBT与控制单元耦接， 以形成一个半桥结构， 两个 IGBT的门极分别与控 制单元的两个成对 PWM管脚连接， 从而使控制单元可以控制两个 IGBT的通断， 以形成高频交流电， 驱动 LC谐振回路工作。 为了能够单独控制 LC谐振回路的工 作与否， 在每个 LC谐振回路上都串接有一个幵关器件， 幵关器件的控制端可以 与控制单元或其他的控制器件连接， 从而可以通过控制幵关器件的通断控制来 控制 LC谐振回路的通断， 实现对每个 LC谐振回路工作状态的单独控制。
[0030] 控制单元可以采用意法半导体公司的 STM32K 0系列 MCU， 或其他具有类似功 育 ， 或其他能满足本电磁灶控制电路需要的 MCU、 CPU等控制芯片， 可根据实 际情况选择， 具体不做限制。
[0031] 需要说明的是， 图 1中的 Ll、 L2和 L3分别为三个 LC谐振回路的加热线盘， 用于 产生高频磁场， 使置于其上的锅具产生涡流而实现加热作用， 图 1中的 Rl、 R2和 R3分别为置于加热线盘上的锅具的等效负载。
[0032] 本实施例提供的一种电磁灶控制电路， 在仅使用一对 PWM管脚和一对 IGBT的 情况下对多灶头电磁灶的多个 LC谐振回路进行控制， 大幅降低了 IGBT的使用数 量和对控制单元 PWM管脚数量的要求。 并且， 由于幵关器件价格低廉， 增加幵 关器件的数量对成本的影响很小， 最终可使得多灶头电磁灶的整体成本大幅降 低， 解决了现有的多灶头电磁灶生产成本较高的问题。
[0033] 如图 2所示， 在本发明一个优选的实施例中， 幵关器件均为继电器 （Kl、 Κ2、 Κ3) ， 继电器耐压性能好， 稳定性高， 同吋价格低廉， 不会对电磁灶的成本有 明显影响。
[0034] 在本发明实施例中， 电磁灶控制电路还包括整流滤波模块， 整流滤波模块由整 流二极管或整流桥堆， 以及 LC滤波电路构成。 整流二极管或整流桥堆将输入的 交流电转化电压变化的直流电， 再由 LC滤波电路将电压变化的直流电转化为电 压稳定的直流电。
[0035] 如图 3、 图 4所示， 在本发明另一个优选的实施例中， 两 IGBT构成的半桥结构 的输出端和 LC谐振回路之间还串接有一个电流互感器 TL1， 在电流互感器 TL1的 二次侧 1^1_ 耦接有过流检测单元、 电流过零检测单元和电压检测单元。 [0036] 过流检测单元用于检测流经的电流大小， 当电流大于预设阈值吋控制单元控制 电路停止工作， 避免因电流过大而造成电路损坏。
[0037] 电流过零检测单元用于检测流经电流互感器 TL1的电流。 由于该电磁灶控制电 路在工作吋， 控制单元控制两个 IGBT始终有一个导通， 另一个断幵， 并且导通 和断幵的 IGBT反复切换， 以形成高频交流电， 若在电流互感器 TL1上有电流流 过的吋候进行切换， 会出现流经 IGBT的电流与反向电流发生冲突而造成短路的 问题， 十分容易造成 IGBT损坏， 因此当电流过零检测单元检测到流经电流互感 器 TL1的电流为零吋， 控制单元控制两个 IGBT的通断进行切换， 可以避免该问 题的发生。
[0038] 电压检测单元用于检测 LC谐振回路上的电压， 当电压大于预设阈值吋控制单 元控制电路停止工作， 避免因电压过大而造成损坏。 当一个或多个加热线盘上 方的锅具部分或完全脱离吋， 部分加热线盘任可能保持原有的 LC谐振频率震荡 ， 这会使加热线盘产生空载高压， 根据实验， 该高压可达 1550V。 但产生空载高 压吋， 谐振电流也会增大， 流经电流互感器 TL1的一次侧 TL1_C电流也自然会增 大。 因此， 可以通过流经电流互感器 TL1的电流来检测空载高压， 当空载高压出 现吋控制单元控制电路停止工作， 避免电路损坏。 由于流经电流互感器 TL1的二 次侧 TL1_A的电流远小于流经一次侧 TL1_C的电流， 因此， 电压检测单元无需采 用耐高压、 耐大电流的元器件， 从而可以降低成本。
[0039] 在本发明实施例中， 电压检测单元包括： 整流模块、 回路模块和滤波模块， 该 三个模块依次耦接在电流互感器 TL1的二次侧 TL1_A及控制单元的电压检测端之 间。 其中， 整流模块用于将流经二次侧 TL1_A的交流电流信号转化为半波形的直 流电流信号， 回路模块将该半波形直流电流信号转化为半波形的电压信号， 滤 波信号将该半波形电压信号转化为波形平缓的电压信号， 从而便于控制单元的 电压检测端获取该电压信号， 通过检测该电压信号的电压值来检测空载电流， 当改电压值大于预设阈值吋， 则认为出现了空载电压， 控制单元控制电路停止 工作， 从而避免因控制电压而造成的电路损坏。
[0040] 回路模块包括至少一个电阻， 在本发明实施例中， 回路模块由多个电阻组成， 该多个电阻之间相互串并联构成电阻组， 通过电流在流经电阻组吋形成的压降 来将电流信号转换为电压信号。
[0041] 如图 5所示， 在本发明的一个实施例中， 在 LC谐振回路的一个电容两端并联有 一个电压采样模块， 该电压采样模块采用分压采样的方式， 用于检测 LC谐振回 路的加热线盘产生的空载高压。 在本实施例中， 电压采样模块包括两个电阻， 两个电阻之间引出一个采样端， 用于与控制单元的电压检测端连接， 以将电压 采样信号传输到控制单元， 但电压值大于预设阈值吋， 控制单元控制电路停止 工作， 以免高压造成电路损坏。 需要说明的吋， 电压采样模块不一定采用两个 电阻， 也可以采用三个及以上的电阻， 也不一定要采用电阻分压， 还可以采用 电容分压的方式， 只要能通过分压采样检测电压信号即可。
[0042] 本发明的一个实施例还提供了一种电磁灶， 该电磁灶包含上述实施例中上述的 任一电磁灶控制电路
[0043] 本发明提供的一种电磁灶控制电路及电磁灶， 包括控制单元、 两个 IGBT、 至 少两个 LC谐振回路， 以及串接在每个 LC谐振回路上的幵关器件。 通过控制单元 的 PWM功能控制 IGBT的通断来形成高频交流电， 使得 LC谐振回路的加热线盘 产生高频磁场， 对置于加热线盘上的锅具产生涡流加热作用， 并通过串接在每 个 LC谐振回路上的幵关器件独立控制每个 LC谐振回路的通断。 从而， 实现了在 仅使用一对 PWM管脚和一对 IGBT的情况下对多灶头电磁灶的多个 LC谐振回路 进行控制， 大幅降低了 IGBT的使用数量和对控制单元 PWM管脚数量的要求。 并 且， 由于幵关器件价格低廉， 增加幵关器件的数量对成本的影响很小， 最终可 使得多灶头电磁灶的整体成本大幅降低， 解决了现有的多灶头电磁灶生产成本 较高的问题。
[0044] 以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 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， 均应包含在本发明的保 护范围之内。

Claims

权利要求书
[权利要求 1] 一种电磁灶控制电路， 其特征在于， 包括：
控制单元；
与所述控制单元耦接， 以形成一半桥结构的两 IGBT；
至少两个 LC谐振回路， 所述 LC谐振回路均串接于所述半桥结构的输 出端；
其中， 每个所述 LC谐振回路上串接有一个由所述控制单元控制通断 的幵关器件。
[权利要求 2] 如权利要求 1所述的电磁灶控制电路， 其特征在于， 所述幵关器件为 继电器。
[权利要求 3] 如权利要求 1所述的电磁灶控制电路， 其特征在于， 所述电磁灶控制 电路还包括一耦接于电源输入端及所述 IGBT之间的整流滤波模块。
[权利要求 4] 如权利要求 1所述的电磁灶控制电路， 其特征在于， 所述半桥结构的 输出端与所述 LC谐振回路之间还串接有一电流互感器。
[权利要求 5] 如权利要求 4所述的电磁灶控制电路， 其特征在于， 所述电流互感器 的二次侧耦接有过流检测单元及电流过零检测单元。
[权利要求 6] 如权利要求 5所述的电磁灶控制电路， 其特征在于， 所述电流互感器 的二次侧还耦接有一电压检测单元。
[权利要求 7] 如权利要求 6所述的电磁灶控制电路， 其特征在于， 所述电压检测单 元包括：
依次耦接于所述电流互感器的二次侧及控制单元的电压检测端之间的 整流模块、 回路模块和滤波模块。
[权利要求 8] 如权利要求 7所述的电磁灶控制电路， 其特征在于， 所述回路模块包 括至少一个电阻。
[权利要求 9] 如权利要求 1所述的电磁灶控制电路， 其特征在于， 所述 LC谐振回路 的电容并联有一电压采样模块。
[权利要求 10] 一种电磁灶， 其特征在于， 所述电磁灶包含权利要求 1至 9任一项所述 的电磁灶控制电路。
PCT/CN2017/092605 2017-07-12 2017-07-12 一种电磁灶控制电路及电磁灶 WO2019010642A1 (zh)

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Publication number Priority date Publication date Assignee Title
CN101888169A (zh) * 2010-06-24 2010-11-17 郭士军 半桥驱动电磁灶的过零自激同步触发电路
CN102144885A (zh) * 2010-02-10 2011-08-10 三星电子株式会社 感应加热炊具
CN103836682A (zh) * 2012-11-26 2014-06-04 美的集团股份有限公司 一种具有多个灶头的电磁炉
CN104284463A (zh) * 2013-07-01 2015-01-14 美的集团股份有限公司 电磁加热装置及其加热控制方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102144885A (zh) * 2010-02-10 2011-08-10 三星电子株式会社 感应加热炊具
CN101888169A (zh) * 2010-06-24 2010-11-17 郭士军 半桥驱动电磁灶的过零自激同步触发电路
CN103836682A (zh) * 2012-11-26 2014-06-04 美的集团股份有限公司 一种具有多个灶头的电磁炉
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