CN216057541U - Electromagnetic heating device and electromagnetic heating equipment - Google Patents
Electromagnetic heating device and electromagnetic heating equipment Download PDFInfo
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- CN216057541U CN216057541U CN202122325295.8U CN202122325295U CN216057541U CN 216057541 U CN216057541 U CN 216057541U CN 202122325295 U CN202122325295 U CN 202122325295U CN 216057541 U CN216057541 U CN 216057541U
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Abstract
The utility model provides an electromagnetic heating device and electromagnetic heating equipment.A detection circuit detects the voltage output by a power supply module to obtain a detection voltage; the controller receives the detection voltage and outputs a pulse signal with variable width as a control signal to control the on/off of the switching tube circuit; the heating circuit performs electromagnetic heating when the switching tube circuit is conducted. The utility model controls the switch circuit to be switched on or off by the pulse signal with the variable output width of the controller, thereby reducing the back electromotive force generated by the inductance coil and reducing the electromagnetic interference.
Description
Technical Field
The utility model relates to the technical field of control, in particular to an electromagnetic heating device and electromagnetic heating equipment.
Background
In the related art, a controller is generally used to control the on and off of the switching tube to control the heating function of the electromagnetic device. When a heating command is received, the controller outputs a control signal with a fixed pulse width to drive the switching tube to be switched on and off, however, in the method, the switching tube is easily burnt under the condition that the power supply voltage is changed to a larger voltage, and the electromagnetic interference is stronger.
SUMMERY OF THE UTILITY MODEL
Accordingly, the present invention is directed to an electromagnetic heating apparatus and system for reducing electromagnetic interference.
In a first aspect, an embodiment of the present invention provides an electromagnetic heating apparatus, including a power supply circuit, a controller, a switching tube circuit, a heating circuit, and a detection circuit; the power supply circuit and the switching tube are respectively connected with the heating circuit; the controller is connected with the switching tube circuit; the detection circuit is respectively connected with the power supply circuit and the controller; the detection circuit is used for detecting the voltage output by the power supply module to obtain a detection voltage; the controller is used for receiving the detection voltage and outputting a control signal to control the on-off of the switching tube circuit; the control signal comprises a pulse signal with variable width; the heating circuit is used for performing electromagnetic heating when the switching tube circuit is conducted.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the switching tube circuit includes a switch driving circuit and a switching tube; the controller is connected with the switch driving circuit; the switching tube is connected with the heating circuit; the switch driving circuit is used for driving the switch tube to be switched on or switched off based on a control signal output by the controller.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present invention provides the first possible implementation manner of the first aspect, wherein the switch tube includes an insulated gate bipolar transistor.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where the power supply circuit includes a power module, a filter circuit, and a rectifier circuit, which are connected in sequence; the rectifying circuit is connected with the detection circuit; the power supply module is used for outputting alternating current commercial power; the filter circuit is used for filtering the alternating current commercial power; the rectification module is used for converting the filtered alternating current mains supply into direct current steamed bread waves.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein the power supply circuit outputs a dc time wave converted from ac mains; the detection circuit comprises a voltage sampling circuit; the voltage sampling circuit is used for sampling the direct current steamed bread wave according to a set frequency to obtain a detection voltage; the controller is used for obtaining a zero crossing point and a peak point of the direct current steamed bread wave based on the detection voltage; obtaining the pulse width change period of the control signal based on the zero crossing point and/or the peak point; obtaining the pulse width variation trend of the control signal based on the preset heating power of the heating circuit; and outputting a pulse signal with the variable width based on the pulse width variation period and the pulse width variation trend so as to control the on/off of the switching tube circuit.
With reference to the fourth possible implementation manner of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where the detection circuit further includes a current detection circuit; the current detection circuit is connected with the rectification circuit and the switching tube circuit; the current detection circuit is used for detecting the current of the heating circuit; the controller is used for obtaining the pulse width variation trend of the control signal based on the current of the heating circuit and the preset heating power; and outputting a pulse signal with the variable width based on the pulse width variation period and the pulse width variation trend so as to control the on/off of the switching tube circuit.
With reference to the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where the power supply circuit is connected to the heating circuit; the power supply circuit supplies power to the heating circuit so that the heating circuit performs electromagnetic heating when the switching tube circuit is conducted.
With reference to the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where the heating circuit includes a resonant heating circuit, and the resonant heating circuit is configured to perform resonant heating when the switching tube circuit is turned on.
With reference to the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where the controller includes a single chip microcomputer.
In a second aspect, an embodiment of the present invention further provides an electromagnetic heating apparatus, including the above electromagnetic heating device and a housing.
The embodiment of the utility model has the following beneficial effects:
the embodiment of the utility model provides an electromagnetic heating device and electromagnetic heating equipment.A detection circuit detects the voltage output by a power supply module to obtain a detection voltage; the controller receives the detection voltage and outputs a pulse signal with variable width as a control signal to control the on/off of the switching tube circuit; the heating circuit performs electromagnetic heating when the switching tube circuit is conducted. In the mode, the controller outputs the pulse signal with the variable width to control the switch circuit to be switched on or switched off, so that the electromagnetic interference is reduced.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of an electromagnetic heating apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electromagnetic heating apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a circuit module of an electromagnetic heating apparatus according to an embodiment of the present invention;
fig. 4 is a comparison diagram of a voltage waveform of a mains supply, a rectified voltage waveform, an envelope waveform of an IGBT collector voltage, and a pulse waveform output by a controller according to an embodiment of the present invention;
fig. 5 is a flowchart of zero crossing point and peak point detection in an electromagnetic heating control method according to an embodiment of the present invention;
FIG. 6 is a flow chart of another electromagnetic heating control method provided by an embodiment of the utility model;
fig. 7 is a comparison diagram of a voltage waveform of a commercial power, a rectified voltage waveform, an envelope waveform of an IGBT collector voltage, and a pulse waveform output by a controller when a pulse width of a first half cycle of a rectified power waveform is changed according to an embodiment of the present invention;
fig. 8 is a comparison diagram of a voltage waveform of a commercial power, a rectified voltage waveform, an envelope waveform of an IGBT collector voltage, and a pulse waveform output by a controller when a pulse width of a second half cycle of a rectified power waveform is changed according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, most of electromagnetic heating devices (such as induction cookers) commonly used in the market adopt a single-tube parallel inversion topological structure to control the heating process of the device, and Insulated Gate Bipolar Transistors (IGBTs) in power switch tubes are selected. Based on the structure, the heating control method of the electromagnetic heating equipment specifically comprises the following steps: when a heating command is received, a controller (MCU) outputs a Control signal with a fixed pulse width according to a currently received power stage to drive the IGBT switch tube to perform heating operation, and the pulse width of the Control signal is kept constant in the entire period of the ac power.
In the process, when the alternating current for supplying the electric energy to the electromagnetic heating equipment is near the zero crossing point, the charging current of the coil panel of the heating circuit is small due to low voltage, and when the IGBT is turned off, the back electromotive force generated by the inductance of the coil panel is small, so that the electromagnetic interference is weaker; when the IGBT is turned off, the back electromotive force generated by the coil inductance is large (i.e., the collector voltage of the IGBT is high), and the electromagnetic Interference is strong, which easily causes the IGBT to burn out and the EMI (Electro-Magnetic Interference) test to be unqualified.
Based on this, the electromagnetic heating device and the electromagnetic heating equipment provided by the embodiment of the utility model can be used for heating scenes of various foods. The utility model controls the switch circuit to be switched on or off by the pulse signal with the variable width, thereby reducing the back electromotive force generated by the inductance coil and reducing the electromagnetic interference.
For the understanding of the present embodiment, first, a detailed description will be given of an electromagnetic heating device disclosed in the embodiment of the present invention.
An embodiment of the present invention provides an electromagnetic heating apparatus, as shown in fig. 1, the apparatus includes a power supply circuit 10, a controller 20, a switching tube circuit 30, a heating circuit 40, and a detection circuit 50. Wherein, the power supply circuit and the switch tube are respectively connected with the heating circuit; the controller is connected with the switching tube circuit; the detection circuit is respectively connected with the power supply circuit and the controller.
The detection circuit is used for detecting the voltage output by the power supply module to obtain a detection voltage; the controller is used for receiving the detection voltage and outputting a control signal to control the on-off of the switching tube circuit; the control signal comprises a pulse signal with variable width; the heating circuit is used for performing electromagnetic heating when the switching tube circuit is conducted.
The power supply module may be a power supply for supplying ac power, and may also include a circuit structure for performing filtering, rectification, and other processing on the ac power. When the power supply module is a power supply for providing alternating current, the detected voltage has a positive value and a negative value, and when the voltage value output by the power supply module is determined, absolute value processing needs to be carried out on the detected voltage. When the voltage output by the power supply module is the rectified direct-current voltage, the detection voltage can be directly adopted to determine the magnitude of the voltage value output by the power supply module.
The controller may be a single chip microcomputer or an FPGA (Field Programmable Gate Array).
Specifically, the switching tube circuit includes a switch driving circuit and a switching tube; the controller is connected with the switch driving circuit; the switching tube is connected with the heating circuit; the switch driving circuit is used for driving the switch tube to be switched on or switched off based on a control signal output by the controller; the switch tube can be an insulated gate bipolar transistor. The insulated gate bipolar transistor combines the advantages of a power transistor and a power field effect transistor, and has good characteristics.
In a specific implementation process, the power supply circuit may include a power supply module, a filter circuit and a rectifier circuit, which are connected in sequence; the rectifying circuit is connected with the detection circuit; the power supply module is used for outputting alternating current commercial power; the filter circuit is used for filtering the alternating current commercial power; the rectification module is used for converting the filtered alternating current mains supply into direct current steamed bread waves.
The detection circuit may include a voltage sampling circuit; the voltage sampling circuit is used for sampling the direct current steamed bread wave according to a set frequency to obtain a detection voltage (also called as a sampling voltage); the controller is used for obtaining a zero crossing point and a peak point of the direct current steamed bread wave based on the detection voltage; obtaining the pulse width change period of the control signal based on the zero crossing point and/or the peak point; obtaining the pulse width variation trend of the control signal based on the preset heating power of the heating circuit; and outputting a pulse signal with the variable width based on the pulse width variation period and the pulse width variation trend so as to control the on/off of the switching tube circuit. The pulse width variation period is usually equal to twice the time difference between the zero crossing point and the peak point of the dc steamed bread wave, and can also be represented by the time difference between two adjacent zero crossing points or the time difference between two adjacent peak points. In the implementation process, experiments can be carried out in advance to obtain pulse width variation trends corresponding to different heating powers; when the preset heating power of the heating circuit is determined, the pulse width variation trend can be correspondingly determined.
Wherein, the detection circuit also comprises a current detection circuit; the current detection circuit is connected with the rectification circuit and the switching tube circuit; the current detection circuit is used for detecting the current of the heating circuit; the controller is used for obtaining the pulse width variation trend of the control signal based on the current of the heating circuit and the preset heating power; and outputting a pulse signal with the variable width based on the pulse width variation period and the pulse width variation trend so as to control the on/off of the switching tube circuit. Specifically, the controller may calculate the power of the heating circuit based on the current of the heating circuit and the resistance of the heating circuit, where the power is a real-time power, adjust the real-time power to a preset heating power by adjusting the pulse width, and determine a change process of the adjusted pulse width as a pulse width change trend.
In a specific implementation process, the power supply circuit is connected with the heating circuit; the power supply circuit supplies power to the heating circuit so that the heating circuit performs electromagnetic heating when the switching tube circuit is conducted. The heating circuit may be a resonant heating circuit that performs resonant heating when the switching tube circuit is turned on.
The embodiment of the utility model provides an electromagnetic heating device, wherein a detection circuit detects the voltage output by a power supply module to obtain a detection voltage; the controller is used for receiving the detection voltage and outputting a pulse signal with variable width as a control signal to control the on-off of the switching tube circuit; the heating circuit performs electromagnetic heating when the switching tube circuit is conducted. In the mode, the controller outputs the pulse signal with the variable width to control the switching circuit to be switched on or switched off, so that the back electromotive force generated by the inductance coil is reduced, and the electromagnetic interference is reduced.
An embodiment of the present invention further provides an electromagnetic heating apparatus, as shown in fig. 2, the apparatus includes the electromagnetic heating device and a housing.
The electromagnetic heating device provided by the embodiment of the utility model has the same technical characteristics as the electromagnetic heating device provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
The embodiment of the utility model also provides another electromagnetic heating device, as shown in fig. 3, the device comprises a power module, a filter circuit, a rectification circuit, a current detection circuit, a resonant heating circuit, a switching tube, a driving circuit, a controller and a voltage sampling circuit.
The switching tube (preferably IGBT) is connected with the resonant heating circuit and is used for controlling the resonant heating circuit to perform resonant operation; the rectifier circuit module is connected with the resonant heating circuit and provides electric energy for resonant operation; the driving circuit is connected with the switching tube and drives the switching tube to be switched on and off; the controller is connected with the driving circuit 7, and the pulse signal output end of the controller controls the electromagnetic heating device to perform heating work. One end of the filter circuit is connected with the power supply module, the other end of the filter circuit is connected with the rectifying circuit, the power supply module provides electric energy for the electromagnetic heating device, the filter circuit filters interference signals generated by the power supply module and the rectifying module, and the rectifying circuit converts the filtered alternating current mains supply into direct current bread waves; the sampling end of the voltage sampling circuit is connected with the rectifying circuit, the sampling signal output end is connected with the controller, and the collected voltage signal of the rectified power supply is sent to the controller, so that the controller judges the specific position of the waveform of the rectified power supply in an alternating current period according to the voltage detection signal; the first end of the current detection circuit is connected with the negative electrode output end of the rectification circuit, the second end of the current detection circuit is connected with the first stage (if the switching tube is an IGBT, the first stage is E stage) of the switching tube, and the detection signal output end is connected with the controller, so that the controller judges the output width of the pulse signal according to the current detection signal and the current target power; the voltage waveform of the mains supply, the rectified voltage waveform, the envelope waveform of the collector voltage of the IGBT and the pulse waveform output by the controller are shown in fig. 4.
Based on the device, the method for controlling the electromagnetic heating can be realized, and the method is applied to the electromagnetic heating device adopting the IGBT as the switching tube. The method can reduce the voltage of the IGBT collector and reduce EMI electromagnetic interference. In the method, a controller of the electromagnetic heating device outputs a pulse signal with variable pulse width in one period of rectified power supply voltage, after the zero point of the power supply voltage is detected, the adjustment is carried out according to the change that the output pulse width is increased firstly and then reduced, after the current peak value, the adjustment is carried out according to the change that the output pulse width is increased firstly and then reduced, the treatment is carried out in the whole period, the method is superior to the method of only carrying out the treatment in half wave, and the effect of reducing the EMI electromagnetic interference is obvious. Meanwhile, the detection method firstly judges different frequency types of 50HZ or 60HZ and then adjusts the pulse width in a targeted manner, and the control mode is easy to realize and has obvious effect.
The method firstly detects the zero crossing point and the peak point of the rectified power waveform voltage, and concretely comprises the following steps as shown in figure 5:
1. the controller detects the voltage value every predetermined time (e.g., 125us) by the voltage sampling circuit.
2. And when the detected voltage is the highest point, the zero crossing point of the rectified power waveform is formed. The zero-crossing point detection can be realized by a zero-crossing detection circuit.
3. Whether the current voltage is 50Hz or 60Hz is determined by 2 times the time interval between the voltage peak point and the zero crossing point (set as T0) (the zero crossing period of the 50Hz alternating current power supply is 10ms, and the zero crossing period of the 60Hz alternating current power supply is 8.3 ms).
In addition, the algorithm for judging whether the current ac power is 50Hz or 60Hz may use the following method:
a. the controller 8 detects a voltage value every predetermined time (for example, 125us) through the voltage sampling circuit, and a zero-crossing point is obtained when the detected voltage is the lowest point; the peak point is when the detected voltage is the highest point.
b. Whether the present voltage is 50Hz or 60Hz is determined by the time interval of two zero-crossings (set to T0).
c. It is determined whether the current voltage is 50Hz or 60Hz by the time interval of two peak points (set to T0).
The heating control process of the electromagnetic heating device by the method is shown in fig. 6, and is specifically realized by the following steps:
and step 1, receiving a heating command.
And 2, outputting a pulse signal by the controller to drive the switching tube to be switched on and off so as to enable the resonant heating circuit to start heating.
Step 3, detecting whether the rectified power waveform reaches m0 time after the zero point t0, if not, continuing to execute the step 2; if yes, go to step 4. Specifically, the controller detects the current specific position of the rectified power waveform through the voltage sampling circuit. The value of m0 is preset according to the actual power, and the value range of t0 not more than m0 more than t1 is required to be met.
And 4, continuously outputting a pulse signal with the pulse width gradually increased to the driving circuit by the controller 8 until the time t1 after the zero point, wherein the output pulse width is increased to a target pulse width which can be preset to be N0.
Step 5, when the power waveform reaches m1 (m 1 is more than or equal to t1 and less than or equal to t2, and the value of m1 is preset according to the actual power) after t1, the controller 8 continuously outputs a pulse signal with the pulse width gradually reduced to the driving circuit, and outputs the pulse signal with the pulse width reduced to the target pulse width N1 until m2(t1 is more than or equal to m2 and less than or equal to t2, and the value of m2 is preset according to the actual power) before the peak value t 2;
step 6, when m3 (m 3 is more than or equal to t2 and less than t3, and m3 value is preset according to actual power) occurs after the power waveform reaches the peak value t2, the controller continuously outputs a pulse signal with the pulse width gradually increased to the driving circuit, and until t3, the pulse signal with the pulse width increased to a target pulse width N2(N2 may be equal to N0 or not equal to N0) is output;
step 7, when the power waveform reaches m4 (m 4 is more than or equal to t3 and less than or equal to t4, and the value of m4 is preset according to actual power) after t3, the controller continuously outputs pulse signals with the pulse width gradually reduced to the driving circuit, and the pulse signals with the pulse width reduced to the target pulse width N3 are output until m5(t3 is more than or equal to m5 and less than or equal to t4, and the value of m5 is preset according to actual power) is preset before the zero point t 4;
and 8, repeating the steps 1-6 when the power supply waveform reaches t 4.
Wherein, the starting point of the pulse width for changing the output of the controller can be the time t0, and the time t4 is finished as a period; the time period may be one cycle starting at a fixed time after the time t0 and ending at a fixed time before the time t 4. Wherein t0 and t4 are zero points of the rectified voltage waveform. Specifically, for the case of low heating power, the IGBT collector voltage is not as high relative to the high heating power, so m0 is preferably greater than t 0; m1 is preferably greater than t 1; that is, the output pulse width does not need to be adjusted immediately at the moment when the zero point is detected, and the adjustment principle of other parameters is similar to the adjustment principle.
In the above-described process of sequentially increasing and decreasing the pulse width, the pulse width to be increased or decreased may be fixed or may be variable.
If the controller outputs the pulse signal with the variable pulse width only in the first half cycle (t0-t2) of the rectified power waveform and outputs the pulse signal with the fixed pulse width in the second half cycle (t2-t4) of the rectified power waveform, the control method can only reduce the IGBT collector voltage before the peak value t2 and can not reduce the IGBT collector voltage after t2, so that the problems of high IGBT collector voltage and strong EMI interference can not be completely solved, as shown in FIG. 7.
If the controller outputs the pulse signal with the variable pulse width only in the second half cycle (t2-t4) of the rectified power waveform and outputs the pulse signal with the fixed pulse width in the first half cycle (t0-t2) of the rectified power waveform, the control mode can only reduce the IGBT collector voltage after the peak value t2 and can not reduce the IGBT collector voltage before t2, so that the problems of high IGBT collector voltage and strong EMI interference can not be completely solved, as shown in FIG. 8.
In the method, the controller outputs the pulse signal with the variable pulse width in the whole period of the rectified power waveform, so that the voltage of the IGBT collector in the whole period can be reduced, and the problems of high voltage of the IGBT collector and strong EMI interference can be thoroughly solved.
The method reduces the collector voltage of the IGBT, can protect the IGBT from being burnt, reduces electromagnetic interference, enables EMI testing allowance to be sufficient, reduces EMI filtering devices, and reduces cost and the structure size of a Printed Circuit Board (PCB).
The electromagnetic heating apparatus and the computer program product of the electromagnetic heating device provided in the embodiments of the present invention include a computer-readable storage medium storing a program code, where instructions included in the program code may be used to execute the method described in the foregoing method embodiments, and specific implementation may refer to the method embodiments, and will not be described herein again.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that the following embodiments are merely illustrative of the present invention, and not restrictive, and the scope of the present invention is not limited thereto: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An electromagnetic heating device is characterized by comprising a power supply circuit, a controller, a switching tube circuit, a heating circuit and a detection circuit; the power supply circuit and the switch tube are respectively connected with the heating circuit; the controller is connected with the switching tube circuit; the detection circuit is respectively connected with the power supply circuit and the controller;
the detection circuit is used for detecting the voltage output by the power supply circuit to obtain a detection voltage;
the controller is used for receiving the detection voltage and outputting a control signal to control the switching tube circuit to be switched on or switched off; the control signal comprises a pulse signal with a variable width;
the heating circuit is used for performing electromagnetic heating when the switching tube circuit is conducted.
2. The apparatus of claim 1, wherein the switch tube circuit comprises a switch driving circuit and a switch tube; the controller is connected with the switch driving circuit; the switch tube is connected with the heating circuit;
the switch driving circuit is used for driving the switch tube to be switched on or switched off based on the control signal output by the controller.
3. The apparatus of claim 2, wherein the switch tube comprises an insulated gate bipolar transistor.
4. The device of claim 1, wherein the power supply circuit comprises a power supply module, a filter circuit and a rectifier circuit which are connected in sequence; the rectifying circuit is connected with the detection circuit;
the power supply module is used for outputting alternating current commercial power; the filter circuit is used for filtering the alternating current commercial power; the rectification circuit is used for converting the filtered alternating current mains supply into direct current steamed bread waves.
5. The apparatus of claim 4, wherein the power supply circuit outputs a DC bread wave converted from AC mains; the detection circuit comprises a voltage sampling circuit; the voltage sampling circuit is used for sampling the direct current steamed bread wave according to a set frequency to obtain a detection voltage;
the controller is used for obtaining a zero crossing point and a peak point of the direct current steamed bread wave based on the detection voltage; obtaining the pulse width change period of the control signal based on the zero crossing point and/or the peak point; obtaining the pulse width variation trend of the control signal based on the preset heating power of the heating circuit; and outputting a pulse signal with the variable width based on the pulse width variation period and the pulse width variation trend so as to control the switching tube circuit to be switched on or switched off.
6. The apparatus of claim 5, wherein the detection circuit further comprises a current detection circuit; the current detection circuit is connected with the rectification circuit and the switching tube circuit; the current detection circuit is used for detecting the current of the heating circuit;
the controller is used for obtaining the pulse width variation trend of the control signal based on the current of the heating circuit and the preset heating power; and outputting a pulse signal with the variable width based on the pulse width variation period and the pulse width variation trend so as to control the switching tube circuit to be switched on or switched off.
7. The device of claim 1, wherein the power supply circuit is connected to the heating circuit; the power supply circuit supplies power to the heating circuit so that the heating circuit performs electromagnetic heating when the switching tube circuit is switched on.
8. The apparatus of claim 1, wherein the heating circuit comprises a resonant heating circuit configured to perform resonant heating when the switching tube circuit is turned on.
9. The device of any one of claims 1-8, wherein the controller comprises a single-chip microcomputer.
10. An electromagnetic heating apparatus comprising an electromagnetic heating device as claimed in any one of claims 1 to 9 and a housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122325295.8U CN216057541U (en) | 2021-09-23 | 2021-09-23 | Electromagnetic heating device and electromagnetic heating equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122325295.8U CN216057541U (en) | 2021-09-23 | 2021-09-23 | Electromagnetic heating device and electromagnetic heating equipment |
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| Publication Number | Publication Date |
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| CN216057541U true CN216057541U (en) | 2022-03-15 |
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| CN202122325295.8U Active CN216057541U (en) | 2021-09-23 | 2021-09-23 | Electromagnetic heating device and electromagnetic heating equipment |
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| CN (1) | CN216057541U (en) |
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2021
- 2021-09-23 CN CN202122325295.8U patent/CN216057541U/en active Active
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