CN204539517U - Electromagnetic heating system and switching tube thereof open control device - Google Patents
Electromagnetic heating system and switching tube thereof open control device Download PDFInfo
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Abstract
本实用新型公开了一种电磁加热系统及其开关管的开通控制装置,其中开通控制装置包括:分压电路,分压电路的第一输入端与开关管的集电极相连,分压电路的第二输入端与开关管的发射极相连后接地,分压电路对开关管的集电极与发射极两端的瞬时电压进行分压以输出第一电压;AD转换器,AD转换器与分压电路的输出端相连,AD转换器将第一电压转换成第一AD值;主控单元,主控单元与驱动电路和AD转换器分别相连,主控单元根据第一AD值获取开关管的集电极与发射极两端的瞬时电压以调整电磁加热系统的加热功率,以使开关管满足预设的开通要求,从而能够将开关管智能调整到预设的开通要求下开通,更好地适应不同的锅具,满足用户的需求。
The utility model discloses an electromagnetic heating system and an on-off control device of a switch tube thereof, wherein the on-off control device comprises: a voltage divider circuit, the first input end of the voltage divider circuit is connected with the collector electrode of the switch tube, and the first input end of the voltage divider circuit The two input terminals are connected to the emitter of the switch tube and then grounded, and the voltage divider circuit divides the instantaneous voltage at both ends of the collector and emitter of the switch tube to output the first voltage; the AD converter, the AD converter and the voltage divider circuit The output terminal is connected, and the AD converter converts the first voltage into the first AD value; the main control unit, the main control unit is connected with the drive circuit and the AD converter respectively, and the main control unit obtains the collector and voltage of the switch tube according to the first AD value. The instantaneous voltage at both ends of the emitter is used to adjust the heating power of the electromagnetic heating system so that the switch tube meets the preset opening requirements, so that the switch tube can be intelligently adjusted to the preset opening requirements to better adapt to different pots , to meet the needs of users.
Description
技术领域technical field
本实用新型涉及生活电器技术领域,特别涉及一种电磁加热系统中开关管的开通控制装置以及一种具有该开通控制装置的电磁加热系统。The utility model relates to the technical field of living appliances, in particular to an opening control device for a switch tube in an electromagnetic heating system and an electromagnetic heating system with the opening control device.
背景技术Background technique
在电磁加热系统例如电磁炉中,功率开关IGBT管开通时最理想的状态是Uce’(IGBT管的集电极与发射极之间的电压)为零且反向续流电流也为零,但是由于实际条件的限制,Uce’在很多情况下都无法振荡到零,特别是加热功率越小,Uce’越难振荡到零,此时开通IGBT为超前开通;反向续流电流在很多情况下也很难为零,加热功率越大,反向续流电流可能越大,此时开通为滞后开通。In an electromagnetic heating system such as an induction cooker, the ideal state when the power switch IGBT tube is turned on is that Uce' (the voltage between the collector and emitter of the IGBT tube) is zero and the reverse freewheeling current is also zero, but due to actual Due to the limitation of conditions, Uce' cannot oscillate to zero in many cases, especially the smaller the heating power, the harder it is for Uce' to oscillate to zero. At this time, the IGBT is turned on in advance; the reverse freewheeling current is also very low in many cases. Difficult to be zero, the greater the heating power, the greater the reverse freewheeling current may be, and the opening at this time is hysteresis opening.
在相关技术中,一般通过实验来决定加热功率的最小值及最大值,以使Uce’小于预设电压、反向续流电流小于预设电流。但是,其存在的缺点是Uce’和反向续流电流只有在使用已知锅具时才能调节到预设范围内,而对于未知的一些锅具,无法保证Uce’和反向续流电流都在预设范围内,这样可能引起IGBT管过热,甚至发生损坏的问题。因此,相关技术存在改进的需要。In the related art, the minimum value and the maximum value of the heating power are generally determined through experiments, so that Uce' is smaller than the preset voltage and the reverse freewheeling current is smaller than the preset current. However, its disadvantage is that Uce' and reverse freewheeling current can only be adjusted to the preset range when using known cookware, and for some unknown cookers, it is impossible to guarantee that Uce' and reverse freewheeling current are both In the preset range, this may cause the IGBT tube to overheat and even cause damage. Therefore, there is a need for improvement in the related art.
实用新型内容Utility model content
本实用新型旨在至少在一定程度上解决相关技术中的技术问题之一。为此,本实用新型的一个目的在于提出一种电磁加热系统中开关管的开通控制装置,能够将开关管智能调整到预设的开通要求下开通,保证开关管安全可靠地工作。The utility model aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, an object of the present utility model is to provide a switch tube opening control device in an electromagnetic heating system, which can intelligently adjust the switch tube to a preset opening requirement, and ensure the switch tube to work safely and reliably.
本实用新型的另一个目的在于提出一种电磁加热系统。Another purpose of the utility model is to provide an electromagnetic heating system.
为达到上述目的,本实用新型提出了一种电磁加热系统中开关管的开通控制装置,其中,所述电磁加热系统包括由加热线圈、谐振电容和开关管组成的谐振电路以及驱动所述开关管的驱动电路,所述开通控制装置包括:分压电路,所述分压电路的第一输入端与所述开关管的集电极相连,所述分压电路的第二输入端与所述开关管的发射极相连后接地,所述分压电路对所述开关管的集电极与发射极两端的瞬时电压进行分压以输出第一电压;AD转换器,所述AD转换器与所述分压电路的输出端相连,所述AD转换器将所述第一电压转换成第一AD值;主控单元,所述主控单元与所述驱动电路和所述AD转换器分别相连,所述主控单元根据所述第一AD值获取所述开关管的集电极与发射极两端的瞬时电压,并根据所述开关管的集电极与发射极两端的瞬时电压调整所述电磁加热系统的加热功率,以使所述开关管满足预设的开通要求。In order to achieve the above object, the utility model proposes a control device for turning on the switch tube in the electromagnetic heating system, wherein the electromagnetic heating system includes a resonant circuit composed of a heating coil, a resonant capacitor and a switch tube, and drives the switch tube The drive circuit, the opening control device includes: a voltage divider circuit, the first input end of the voltage divider circuit is connected to the collector of the switch tube, the second input end of the voltage divider circuit is connected to the switch tube The emitter of the switch is connected to the ground, and the voltage divider circuit divides the instantaneous voltage across the collector and the emitter of the switch tube to output the first voltage; the AD converter, the AD converter and the voltage divider The output terminal of the circuit is connected, and the AD converter converts the first voltage into a first AD value; a main control unit, the main control unit is connected with the driving circuit and the AD converter respectively, and the main control unit The control unit acquires the instantaneous voltage across the collector and emitter of the switch tube according to the first AD value, and adjusts the heating power of the electromagnetic heating system according to the instantaneous voltage across the collector and emitter of the switch tube , so that the switch tube meets a preset turn-on requirement.
根据本实用新型提出的电磁加热系统中开关管的开通控制装置,通过分压电路对开关管的集电极与发射极两端的瞬时电压进行分压以输出第一电压,并且AD转换器将第一电压转换成第一AD值,这样电压检测电路检测开关管的集电极与发射极两端的瞬时电压,这样主控单元根据第一AD值获取开关管的集电极与发射极两端的瞬时电压,并根据开关管的集电极与发射极两端的瞬时电压调整电磁加热系统的加热功率,以使开关管满足预设的开通要求,从而能够将开关管智能调整到预设的开通要求下开通,更好地适应不同的锅具,满足用户的需求,并且能够避免开关管因超前或滞后开通而发热甚至损坏,保证开关管安全可靠地工作。According to the opening control device of the switching tube in the electromagnetic heating system proposed by the utility model, the instantaneous voltage at both ends of the collector and the emitter of the switching tube is divided by a voltage dividing circuit to output the first voltage, and the AD converter converts the first The voltage is converted into the first AD value, so that the voltage detection circuit detects the instantaneous voltage across the collector and the emitter of the switch tube, so that the main control unit obtains the instantaneous voltage between the collector and the emitter of the switch tube according to the first AD value, and Adjust the heating power of the electromagnetic heating system according to the instantaneous voltage at both ends of the collector and emitter of the switch tube, so that the switch tube can meet the preset opening requirements, so that the switch tube can be intelligently adjusted to the preset opening requirements, which is better It can adapt to different pots and utensils to meet the needs of users, and can prevent the switch tube from heating or even being damaged due to the advanced or delayed opening, so as to ensure the safe and reliable operation of the switch tube.
其中,当所述第一AD值大于第一预设值时,所述主控单元判断所述开关管超前开通,并增加所述电磁加热系统的加热功率;以及当所述第一AD值小于第二预设值时,所述主控单元判断所述开关管滞后开通,并减小所述电磁加热系统的加热功率,其中,所述第二预设值小于所述第一预设值。Wherein, when the first AD value is greater than a first preset value, the main control unit judges that the switch tube is turned on in advance, and increases the heating power of the electromagnetic heating system; and when the first AD value is less than When the second preset value is reached, the main control unit judges that the switching tube is turned on with a delay, and reduces the heating power of the electromagnetic heating system, wherein the second preset value is smaller than the first preset value.
具体地,所述开关管为IGBT管,所述IGBT管的C极与并联的所述加热线圈和谐振电容相连,且所述IGBT管的C极与所述分压电路的第一输入端相连,所述IGBT管的E极与所述分压电路的第二输入端相连后接地,所述IGBT管的G极与所述驱动电路相连。Specifically, the switch tube is an IGBT tube, the C pole of the IGBT tube is connected to the heating coil and the resonant capacitor connected in parallel, and the C pole of the IGBT tube is connected to the first input end of the voltage divider circuit , the E pole of the IGBT tube is connected to the second input terminal of the voltage divider circuit and then grounded, and the G pole of the IGBT tube is connected to the driving circuit.
具体地,所述分压电路包括串联的第一电阻和第二电阻,所述串联的第一电阻和第二电阻之间具有第一节点,所述第一节点作为所述分压电路的输出端。Specifically, the voltage dividing circuit includes a first resistor and a second resistor connected in series, a first node is provided between the first resistor and the second resistor connected in series, and the first node is used as the output of the voltage dividing circuit end.
优选地,所述AD转换器可与所述主控单元集成在一起。Preferably, the AD converter can be integrated with the main control unit.
此外,本实用新型还提出了一种电磁加热系统,其包括上述的电磁加热系统中开关管的开通控制装置。In addition, the utility model also proposes an electromagnetic heating system, which includes the above-mentioned opening control device for the switching tube in the electromagnetic heating system.
根据本实用新型提出的电磁加热系统,能够将开关管智能调整到预设的开通要求下开通,更好地适应不同的锅具,满足用户的需求,保证开关管安全可靠地工作。According to the electromagnetic heating system proposed by the utility model, the switching tube can be intelligently adjusted to the preset opening requirement, which can better adapt to different pots, meet the needs of users, and ensure the safe and reliable operation of the switching tube.
其中,所述电磁加热系统可包括电磁炉、电磁电饭煲、电磁压力锅。Wherein, the electromagnetic heating system may include an electromagnetic cooker, an electromagnetic rice cooker, and an electromagnetic pressure cooker.
附图说明Description of drawings
图1是根据本实用新型实施例的电磁加热系统中开关管的开通控制装置的示意图;Fig. 1 is a schematic diagram of an opening control device for a switching tube in an electromagnetic heating system according to an embodiment of the present invention;
图2是开关管发生超前开通时电压和电流的波形示意图;Figure 2 is a schematic diagram of voltage and current waveforms when the switch tube is turned on in advance;
图3是开关管发生滞后开通时电压和电流的波形示意图;以及Fig. 3 is a schematic diagram of voltage and current waveforms when the switching tube is turned on with hysteresis; and
图4是根据本实用新型一个具体实施例的电磁加热系统中开关管的开通控制装置的示意图。Fig. 4 is a schematic diagram of an on-off control device for a switching tube in an electromagnetic heating system according to a specific embodiment of the present invention.
附图标记:Reference signs:
加热线圈L2、谐振电容C2、开关管Q1、谐振电路20、驱动电路30、开通控制装置10、分压电路101、主控单元102、AD转换器103、滤波电感L1、滤波电容C1和整流器40。Heating coil L2, resonant capacitor C2, switch tube Q1, resonant circuit 20, drive circuit 30, opening control device 10, voltage divider circuit 101, main control unit 102, AD converter 103, filter inductor L1, filter capacitor C1 and rectifier 40 .
具体实施方式Detailed ways
下面详细描述本实用新型的实施例,所述实施例的示例在附图中示出,其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的,旨在用于解释本实用新型,而不能理解为对本实用新型的限制。Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.
下面参考附图来描述本实用新型实施例提出的电磁加热系统中开关管的开通控制装置以及具有该开通控制装置的电磁加热系统,其中,电磁加热系统用于对锅具进行加热。The opening control device of the switch tube in the electromagnetic heating system and the electromagnetic heating system with the opening control device proposed by the embodiment of the present invention will be described below with reference to the accompanying drawings, wherein the electromagnetic heating system is used to heat the pan.
图1是根据本实用新型实施例的电磁加热系统中开关管的开通控制装置的示意图。如图1所示,该电磁加热系统包括由加热线圈L2、谐振电容C2和开关管Q1组成的谐振电路20以及驱动开关管Q1的驱动电路30。其中,谐振电路20用于对锅具进行谐振加热,具体地,当开关管Q1在驱动电路30的驱动下导通时,加热线圈L2获得充电,为维持加热线圈L2和谐振电容C2之间的振荡做准备,当开关管Q1在驱动电路30的驱动下关断时,加热线圈L2和谐振电容C2进行振荡。由此加热线圈L2周围产生交变磁场,交变磁场的磁力线大部分通过锅具,并在锅具的锅底中产生大量涡流,从而产生烹饪所需的热量。Fig. 1 is a schematic diagram of an on-off control device for a switching tube in an electromagnetic heating system according to an embodiment of the present invention. As shown in FIG. 1 , the electromagnetic heating system includes a resonant circuit 20 composed of a heating coil L2 , a resonant capacitor C2 and a switch tube Q1 , and a drive circuit 30 for driving the switch tube Q1 . Wherein, the resonant circuit 20 is used for resonantly heating the pot, specifically, when the switch tube Q1 is turned on under the drive of the drive circuit 30, the heating coil L2 is charged, in order to maintain the connection between the heating coil L2 and the resonant capacitor C2 To prepare for oscillation, when the switch tube Q1 is turned off under the drive of the drive circuit 30, the heating coil L2 and the resonant capacitor C2 oscillate. As a result, an alternating magnetic field is generated around the heating coil L2, and most of the magnetic field lines of the alternating magnetic field pass through the pot and generate a large amount of eddy currents in the bottom of the pot, thereby generating heat required for cooking.
在本实用新型的实施例中,如图1所示,开通控制装置10包括:分压电路101、AD转换器103和主控单元102。其中,分压电路101的第一输入端与开关管Q1的集电极相连,分压电路101的第二输入端与开关管Q1的发射极相连后接地,分压电路101对开关管Q1的集电极与发射极两端的瞬时电压进行分压以输出第一电压,AD转换器103与分压电路101的输出端相连,AD转换器103将所述第一电压转换成第一AD值。主控单元102与驱动电路30和AD转换器103分别相连,主控单元102根据所述第一AD值获取开关管Q1的集电极与发射极两端的瞬时电压,并根据开关管Q1的集电极与发射极两端的瞬时电压调整所述电磁加热系统的加热功率,以使开关管Q1满足预设的开通要求。In an embodiment of the present invention, as shown in FIG. 1 , the opening control device 10 includes: a voltage dividing circuit 101 , an AD converter 103 and a main control unit 102 . Wherein, the first input end of the voltage dividing circuit 101 is connected to the collector of the switching tube Q1, the second input end of the voltage dividing circuit 101 is connected to the emitter of the switching tube Q1 and then grounded, and the voltage dividing circuit 101 is connected to the collector of the switching tube Q1. The instantaneous voltage at both ends of the electrode and the emitter is divided to output a first voltage, and the AD converter 103 is connected to the output terminal of the voltage dividing circuit 101 , and the AD converter 103 converts the first voltage into a first AD value. The main control unit 102 is connected to the drive circuit 30 and the AD converter 103 respectively. The main control unit 102 acquires the instantaneous voltage at both ends of the collector and the emitter of the switching tube Q1 according to the first AD value, and obtains the instantaneous voltage at both ends of the collector and the emitter of the switching tube Q1 according to the first AD value. The instantaneous voltage at both ends of the emitter and the emitter adjusts the heating power of the electromagnetic heating system, so that the switch tube Q1 meets the preset turn-on requirement.
也就是说,主控单元102通过AD转换器103输出的第一AD值侦测开关管Q1的集电极与发射极两端的瞬时电压,以来判断开关管Q1是否发生超前开通或滞后开通。That is to say, the main control unit 102 detects the instantaneous voltage across the collector and the emitter of the switch Q1 through the first AD value output by the AD converter 103 to determine whether the switch Q1 is turned on in advance or delayed.
其中,主控单元102可向驱动电路30输出PWM控制信号,以使驱动电路30驱动开关管Q1导通或关断,主控单元102并根据第一AD值获取开关管的集电极与发射极两端的瞬时电压Uce。Wherein, the main control unit 102 can output a PWM control signal to the driving circuit 30, so that the driving circuit 30 drives the switch tube Q1 to turn on or off, and the main control unit 102 obtains the collector and emitter of the switch tube according to the first AD value The instantaneous voltage across Uce.
需要说明的是,在本实用新型的实施例中,预设的开通要求具体是指开关管Q1的集电极与发射极之间的电压Uce在开关管Q1超前开通时要小于或等于第一电压阈值,以及开关管Q1的集电极与发射极之间的电压Uce在开关管Q1滞后开通时要大于或等于第二电压阈值。It should be noted that, in the embodiment of the present utility model, the preset turn-on requirement specifically means that the voltage Uce between the collector and the emitter of the switch tube Q1 should be less than or equal to the first voltage when the switch tube Q1 is turned on in advance. The threshold, and the voltage Uce between the collector and the emitter of the switching tube Q1 must be greater than or equal to the second voltage threshold when the switching tube Q1 is turned on with a delay.
还需说明的是,开关管Q1在开通时是否满足预设的开通要求受锅具和加热功率等因素影响。如果加热功率较低,开关管Q1可能会发生超前开通;如果加热功率较高,开关管Q1可能会发生滞后开通,因此,本实用新型实施例的开通控制装置通过调整加热功率以使开关管Q1满足预设的开通要求,进而使电磁加热系统适应不同的锅具。It should also be noted that whether the switching tube Q1 meets the preset turning-on requirement when it is turned on is affected by factors such as the pot and the heating power. If the heating power is low, the switching tube Q1 may be turned on in advance; if the heating power is high, the switching tube Q1 may be turned on laggingly. Therefore, the opening control device of the embodiment of the utility model adjusts the heating power so that the switching tube Q1 Meet the preset opening requirements, and then adapt the electromagnetic heating system to different pots.
在电磁加热系统进行加热的过程中,可通过侦测开关管Q1开通时开关管的集电极与发射极两端的瞬时电压,以来判断开关管Q1是否发生超前开通或滞后开通。在开关管Q1开通时,主控单元102可获取开关管的集电极与发射极两端的瞬时电压,并根据开关管的集电极与发射极两端的瞬时电压可判断开关管Q1是否满足预设的开通要求。如果满足,则维持当前的加热功率不变;如果不满足,即开关管Q1超前或滞后开通,则需要调整加热功率。During the heating process of the electromagnetic heating system, by detecting the instantaneous voltage across the collector and emitter of the switch tube Q1 when the switch tube Q1 is turned on, it can be judged whether the switch tube Q1 is turned on in advance or delayed. When the switch tube Q1 is turned on, the main control unit 102 can obtain the instantaneous voltage across the collector and emitter terminals of the switch tube, and judge whether the switch tube Q1 meets the preset requirements according to the instantaneous voltage across the collector and emitter terminals of the switch tube. Activation requirements. If it is satisfied, keep the current heating power unchanged; if it is not satisfied, that is, the switching tube Q1 is turned on ahead of time or lagging behind, then the heating power needs to be adjusted.
由此,本实用新型实施例提出的电磁加热系统中开关管的开通控制装置10,通过第一AD值以获取开关管的集电极与发射极两端的瞬时电压来调整电磁加热系统的加热功率,以使开关管Q1满足预设的开通要求,从而,能够将开关管智能调整到预设的开通要求下开通,更好地适应不同的锅具,满足用户的需求,并且能够避免开关管因超前或滞后开通而发热甚至损坏。Therefore, the opening control device 10 of the switching tube in the electromagnetic heating system proposed by the embodiment of the utility model adjusts the heating power of the electromagnetic heating system by obtaining the instantaneous voltage at both ends of the collector and the emitter of the switching tube through the first AD value, So that the switching tube Q1 meets the preset opening requirements, so that the switching tube can be intelligently adjusted to the preset opening requirements, which can better adapt to different pots and utensils, meet the needs of users, and prevent the switching tube from being ahead of time. Or lag open and heat even damage.
根据本实用新型的一个具体示例,主控单元102可通过调整输出的PWM控制信号的占空比来达到调整加热功率的目的。According to a specific example of the present invention, the main control unit 102 can adjust the heating power by adjusting the duty cycle of the output PWM control signal.
进一步地,根据本实用新型的一个实施例,当所述第一AD值大于第一预设值时,主控单元102判断所述开关管超前开通,并增加所述电磁加热系统的加热功率;以及当所述第一AD值小于第二预设值时,主控单元102判断所述开关管滞后开通,并减小所述电磁加热系统的加热功率,其中,所述第二预设值小于所述第一预设值。需要说明的是,第一预设值与第一电压阈值相对应,第二预设值与第二电压阈值相对应,并且第二电压阈值小于第一电压阈值,第二电压阈值和第一电压阈值可根据开关管的实际情况进行标定。Further, according to an embodiment of the present invention, when the first AD value is greater than a first preset value, the main control unit 102 judges that the switching tube is turned on in advance, and increases the heating power of the electromagnetic heating system; And when the first AD value is less than a second preset value, the main control unit 102 judges that the switching tube is opened with a delay, and reduces the heating power of the electromagnetic heating system, wherein the second preset value is less than the first preset value. It should be noted that the first preset value corresponds to the first voltage threshold, the second preset value corresponds to the second voltage threshold, and the second voltage threshold is smaller than the first voltage threshold, and the second voltage threshold is equal to the first voltage The threshold can be calibrated according to the actual situation of the switching tube.
需要说明的是,当开关管Q1发生超前开通时,开关管Q1的集电极与发射极之间的电压Uce和流过开关管Q1的电流Ice的波形如图2所示,在开关管开通的一瞬间,开关管的集电极与发射极两端的瞬时电压Uce较大,这样可检测到该瞬时电压Uce1,如果此时的Uce1超过第一电压阈值即第一AD值大于第一预设值,则判断开关管Q1发生超前开通,造成开关管损耗较大;当开关管Q1发生滞后开通时,开关管Q1的集电极与发射极之间的电压Uce和流过开关管Q1的电流Ice的波形如图3所示,在开关管开通的一瞬间开关管的集电极与发射极两端的瞬时电压Uce为0或负值,如果此时的Uce2小于第二电压阈值即第一AD值小于第二预设值,则判断开关管Q1发生滞后开通,开关管也会有较大损耗。It should be noted that when the switch tube Q1 is turned on in advance, the voltage Uce between the collector and the emitter of the switch tube Q1 and the waveform of the current Ice flowing through the switch tube Q1 are shown in Figure 2. In an instant, the instantaneous voltage Uce at both ends of the collector and emitter of the switch tube is relatively large, so that the instantaneous voltage Uce1 can be detected. If Uce1 at this time exceeds the first voltage threshold, that is, the first AD value is greater than the first preset value, Then it is judged that the switching tube Q1 is turned on in advance, resulting in a large loss of the switching tube; when the switching tube Q1 is turned on with a delay, the waveform of the voltage Uce between the collector and the emitter of the switching tube Q1 and the current Ice flowing through the switching tube Q1 As shown in Figure 3, when the switch tube is turned on, the instantaneous voltage Uce across the collector and emitter of the switch tube is 0 or a negative value. If Uce2 at this time is less than the second voltage threshold, that is, the first AD value is If the preset value is used, it is judged that the switching tube Q1 is turned on with a delay, and the switching tube will also have a large loss.
如上所述,根据第一AD值的大小可获取开关管的集电极与发射极两端的瞬时电压Uce。在开关管Q1开通时,即在主控单元102输出的PWM控制信号由低电平变为高电平时,如果开关管的集电极与发射极两端的瞬时电压大于第一电压阈值,则主控单元102增加电磁加热系统的加热功率,以降低集电极与发射极之间的电压Uce,使电压Uce下降,减小开关管的损耗,这样使得开关管满足预设的开通要求,从而更好地适应锅具。如果开关管的集电极与发射极两端的瞬时电压小于第二电压阈值,则主控单元102减小电磁加热系统的加热功率,使得开关管的滞后损耗减小,以使开关管满足预设的开通要求,从而更好地适应锅具。As mentioned above, according to the magnitude of the first AD value, the instantaneous voltage Uce across the collector and the emitter of the switch tube can be obtained. When the switch tube Q1 is turned on, that is, when the PWM control signal output by the main control unit 102 changes from a low level to a high level, if the instantaneous voltage across the collector and the emitter of the switch tube is greater than the first voltage threshold, the main control Unit 102 increases the heating power of the electromagnetic heating system to reduce the voltage Uce between the collector and the emitter, so that the voltage Uce drops and reduces the loss of the switch tube, so that the switch tube meets the preset opening requirements, thereby better Adapt to pots and pans. If the instantaneous voltage across the collector and emitter of the switch tube is less than the second voltage threshold, the main control unit 102 reduces the heating power of the electromagnetic heating system, so that the hysteresis loss of the switch tube is reduced, so that the switch tube meets the preset Open the request, so as to better adapt to the pot.
由此,本实用新型实施例的开通控制装置能够将开关管智能调整到预设的开通要求下开通,更好地适应不同的锅具,满足用户的需求,并且能够避免开关管因超前或滞后开通而发热甚至损坏。Therefore, the opening control device of the embodiment of the utility model can intelligently adjust the switching tube to the preset opening requirement, better adapt to different pots, meet the needs of users, and can avoid the switching tube due to leading or lagging Turn on and heat up or even damage.
根据本实用新型的一个具体实施例,如图4所示,加热线圈L2可与谐振电容C2并联,开关管Q1可为IGBT管,IGBT管的C极与并联的加热线圈L2和谐振电容C2相连,且IGBT管的C极与分压电路101的第一输出端相连后接地,IGBT管的E极与分压电路101的第二输入端相连后接地,IGBT管的G极与驱动电路30相连。According to a specific embodiment of the present invention, as shown in Figure 4, the heating coil L2 can be connected in parallel with the resonant capacitor C2, the switching tube Q1 can be an IGBT tube, and the C pole of the IGBT tube is connected with the parallel heating coil L2 and the resonant capacitor C2 , and the C pole of the IGBT tube is connected to the first output end of the voltage divider circuit 101 and then grounded, the E pole of the IGBT tube is connected to the second input end of the voltage divider circuit 101 and then grounded, and the G pole of the IGBT tube is connected to the drive circuit 30 .
进一步地,如图4的示例,电磁加热系统还可包括滤波电感L1、滤波电容C1和整流器40。Further, as shown in FIG. 4 , the electromagnetic heating system may further include a filter inductor L1 , a filter capacitor C1 and a rectifier 40 .
具体地,滤波电感L1的一端与并联后的加热线圈L2与谐振电容C2的一端相连,其中,并联后的加热线圈L2与谐振电容C2的另一端与IGBT管的C极相连;滤波电容C1的一端与滤波电感L1的一端相连,滤波电容C1的另一端接地;整流器40的第一输入端与交流电源AC的火线L相连,整流器40的第二输入端与交流电源AC的零线N相连,整流器40的第一输出端与滤波电感L1的另一端相连,整流器40的第二输出端接地。Specifically, one end of the filter inductance L1 is connected to one end of the parallel-connected heating coil L2 and the resonant capacitor C2, wherein, the other end of the parallel-connected heating coil L2 and the resonant capacitor C2 is connected to the C pole of the IGBT tube; the filter capacitor C1 One end is connected to one end of the filter inductor L1, and the other end of the filter capacitor C1 is grounded; the first input end of the rectifier 40 is connected to the live line L of the AC power supply AC, and the second input end of the rectifier 40 is connected to the neutral line N of the AC power supply AC. The first output end of the rectifier 40 is connected to the other end of the filter inductor L1, and the second output end of the rectifier 40 is grounded.
并且,如图4所示,分压电路101包括串联的第一电阻R1和第二电阻R2,串联的第一电阻R1和第二电阻R2之间具有第一节点J1,第一节点J1作为分压电路101的输出端,与AD转换器103相连。Moreover, as shown in FIG. 4 , the voltage divider circuit 101 includes a first resistor R1 and a second resistor R2 connected in series, and a first node J1 is located between the first resistor R1 and the second resistor R2 connected in series, and the first node J1 serves as a divider. The output terminal of voltage circuit 101 is connected with AD converter 103 .
根据本实用新型的一个实施例,如图4所示,AD转换器103还可与主控单元102集成在一起,例如AD转换器103集成在主控单元102中。According to an embodiment of the present invention, as shown in FIG. 4 , the AD converter 103 can also be integrated with the main control unit 102 , for example, the AD converter 103 is integrated in the main control unit 102 .
根据本实用新型实施例提出的电磁加热系统中开关管的开通控制装置,通过分压电路对开关管的集电极与发射极两端的瞬时电压进行分压以输出第一电压,并且AD转换器将第一电压转换成第一AD值,这样电压检测电路检测开关管的集电极与发射极两端的瞬时电压,这样主控单元根据第一AD值获取开关管的集电极与发射极两端的瞬时电压,并根据开关管的集电极与发射极两端的瞬时电压调整电磁加热系统的加热功率,以使开关管满足预设的开通要求,从而能够将开关管智能调整到预设的开通要求下开通,更好地适应不同的锅具,满足用户的需求,并且能够避免开关管因超前或滞后开通而发热甚至损坏,保证开关管安全可靠地工作。According to the opening control device of the switching tube in the electromagnetic heating system proposed by the embodiment of the present invention, the instantaneous voltage at both ends of the collector and the emitter of the switching tube is divided by the voltage dividing circuit to output the first voltage, and the AD converter will The first voltage is converted into the first AD value, so that the voltage detection circuit detects the instantaneous voltage across the collector and emitter of the switch tube, so that the main control unit obtains the instantaneous voltage across the collector and emitter of the switch tube according to the first AD value , and adjust the heating power of the electromagnetic heating system according to the instantaneous voltage across the collector and emitter of the switch tube, so that the switch tube meets the preset opening requirements, so that the switch tube can be intelligently adjusted to the preset opening requirements. It can better adapt to different pots and utensils, meet the needs of users, and can prevent the switch tube from heating or even being damaged due to the early or late opening, so as to ensure the safe and reliable operation of the switch tube.
另外,本实用新型实施例还提出了一种电磁加热系统,包括上述实施例描述的开关管的开通控制装置。In addition, the embodiment of the present utility model also proposes an electromagnetic heating system, which includes the switch tube turn-on control device described in the above embodiments.
其中,电磁加热系统可包括电磁炉、电磁电饭煲、电磁压力锅等。Wherein, the electromagnetic heating system may include an electromagnetic cooker, an electromagnetic rice cooker, an electromagnetic pressure cooker, and the like.
根据本实用新型实施例提出的电磁加热系统,能够将开关管智能调整到预设的开通要求下开通,更好地适应不同的锅具,满足用户的需求,保证开关管安全可靠地工作。According to the electromagnetic heating system proposed by the embodiment of the utility model, the switching tube can be intelligently adjusted to the preset opening requirement, which can better adapt to different pots, meet the needs of users, and ensure the safe and reliable operation of the switching tube.
在本实用新型的描述中,需要理解的是,术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”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实用新型和简化描述,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,因此不能理解为对本实用新型的限制。In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" The orientation or positional relationship indicated by , "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying the referred device Or elements must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.
此外,术语“第一”、“第二”仅用于描述目的,而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此,限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本实用新型的描述中,“多个”的含义是至少两个,例如两个,三个等,除非另有明确具体的限定。In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.
在本实用新型中,除非另有明确的规定和限定,术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解,例如,可以是固定连接,也可以是可拆卸连接,或成一体;可以是机械连接,也可以是电连接;可以是直接相连,也可以通过中间媒介间接相连,可以是两个元件内部的连通或两个元件的相互作用关系,除非另有明确的限定。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在本实用新型中的具体含义。In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrated; may be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediary, and may be an internal communication between two elements or an interactive relationship between two elements, unless otherwise stated Clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.
在本实用新型中,除非另有明确的规定和限定,第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触,或第一和第二特征通过中间媒介间接接触。而且,第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方,或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方,或仅仅表示第一特征水平高度小于第二特征。In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first feature and the second feature through an intermediary indirect contact. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.
在本说明书的描述中,参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本实用新型的至少一个实施例或示例中。在本说明书中,对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且,描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外,在不相互矛盾的情况下,本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.
尽管上面已经示出和描述了本实用新型的实施例,可以理解的是,上述实施例是示例性的,不能理解为对本实用新型的限制,本领域的普通技术人员在本实用新型的范围内可以对上述实施例进行变化、修改、替换和变型。Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limitations of the present invention, and those skilled in the art are within the scope of the present invention. Variations, modifications, substitutions and variations can be made to the above-described embodiments.
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CN109661053B (en) * | 2017-10-11 | 2021-03-19 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating appliance, electromagnetic heating system and synchronous control device thereof |
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