Electromagnetic milk frothing machine and control circuit therefor

Abstract

The application relates to an electromagnetic milk frothing machine and a control circuit thereof, the control circuit comprising an IGBT heating module, a stirring module, a first temperature detection unit and a second temperature detection unit which are in electrical connection with a master control unit, the IGBT heating module being in electrical connection with a heating unit arranged on a milk cup of the stirring module, the first temperature detection unit being arranged on an IGBT of the IGBT heating module, and the second temperature detection unit being arranged in the milk cup, wherein the master control unit is used for controlling the IGBT heating module to drive the heating unit to heat the milk cup and to drive the stirring module to stir milk in the milk cup so as to generate milk froth; the first temperature detection unit is used for detecting a first temperature corresponding to the IGBT; the second temperature detection unit is used for detecting a second temperature corresponding to the milk cup; and the master control unit is further used for controlling the IGBT heating module to stop driving the heating unit to heat the milk cup when at least one of the first temperature and the second temperature exceeds a corresponding preset temperature threshold.

Description

Technical Field

[0001] This application relates to the field of milk frother technology, and in particular to an electromagnetic milk frother and its control circuit. Background Technology

[0002] A milk frother uses a stirrer installed in a milk container to stir the milk and create bubbles, while simultaneously heating the milk.

[0003] In related technologies, milk frothers that lack temperature protection or only have single temperature protection have several drawbacks. Without temperature protection, the temperature of the heated milk cannot be effectively controlled, leading to excessively high milk temperatures and a loss of texture in the milk foam, resulting in a poor user experience. Conversely, single temperature protection, such as milk temperature protection or overheating protection, can cause issues: firstly, the heated milk may not taste good; secondly, abnormal heating of the milk frother can damage the machine and even pose safety risks.

[0004] Currently, no effective solution has been proposed to address the issues of poor taste and safety risks associated with milk foam produced by milk frothers in related technologies. Utility Model Content

[0005] In view of this, it is necessary to provide an electromagnetic milk frother and its control circuit to at least solve the problems of poor taste and safety risks of milk foam produced by milk frothers in the related art.

[0006] In a first aspect, this application provides a technical solution as follows: a control circuit for an electromagnetic milk frother, comprising an IGBT heating module, a stirring module, a first temperature detection unit, and a second temperature detection unit electrically connected to a main control unit. The IGBT heating module is electrically connected to a heating unit disposed on a milk cup of the stirring module. The first temperature detection unit is disposed on the IGBT of the IGBT heating module, and the second temperature detection unit is disposed inside the milk cup. The main control unit is used to control the IGBT heating module to drive the heating unit to heat the milk cup and to drive the stirring module to stir the milk placed in the milk cup to generate milk foam. The first temperature detection unit is used to detect a first temperature corresponding to the IGBT. The second temperature detection unit is used to detect a second temperature corresponding to the milk cup. The main control unit is further used to control the IGBT heating module to stop driving the heating unit to heat the milk cup when at least one of the first temperature and the second temperature exceeds a corresponding preset temperature threshold.

[0007] In one embodiment, the first temperature detection unit includes a thermistor attached to the IGBT. One end of the thermistor is electrically connected to a first resistor, a first capacitor, and the main control unit, respectively. The other end of the thermistor is grounded. The other end of the first resistor is electrically connected to a first power supply, and the other end of the first capacitor is grounded. The thermistor and the first resistor form a voltage divider detection circuit. The thermistor forms a corresponding voltage divider resistor as the temperature of the IGBT changes, so that the voltage divider detection circuit generates a first voltage divider at the electrical connection point between the voltage divider resistor and the first resistor. The main control unit is used to generate the first temperature based on the received first voltage divider.

[0008] In one embodiment, the second temperature detection unit includes one of the following: an NTC temperature detection sensor, an infrared thermometer.

[0009] In one embodiment, the heating unit includes a magnetic coil covering the sidewalls and bottom of the milk cup.

[0010] In one embodiment, the IGBT heating module is also connected to the mains power grid via a series thermal fuse.

[0011] In one embodiment, the IGBT heating module further includes a rectifier bridge, an LC oscillation circuit, and a driver chip. The input terminal of the rectifier bridge is electrically connected to the mains power grid, the output terminal of the rectifier bridge is electrically connected to the input terminal of the LC oscillation circuit, the output terminal of the LC oscillation circuit is electrically connected to one end of the heating unit, the other end of the heating unit is electrically connected to the collector of the IGBT, the emitter of the IGBT is connected to the gate of the IGBT, and the gate of the IGBT is electrically connected to the power switch drive port of the driver chip. The control port of the driver chip is also electrically connected to the main control unit. The main control unit is used to generate a switch start / stop signal; the driver chip is used to generate a corresponding power switch signal according to the level of the received switch start / stop signal; and the IGBT is used to control the switching of the collector and emitter of the IGBT according to the level of the power switch signal received at the gate of the IGBT, so as to drive the heating unit to heat up.

[0012] In one embodiment, the stirring module further includes a motor drive module, which controls a drive motor electrically connected to the stirrer. The motor drive module includes a first switching transistor, the input terminal of which is electrically connected to the first electrode of the drive motor and the anode of the first Zener diode, the second electrode of which is electrically connected to the cathode of the first Zener diode and a first pull-up resistor, the controlled terminal of the first switching transistor being electrically connected to the main control unit via a second resistor in series, and the output terminal of the first switching transistor being connected to ground via a third resistor in series. The main control unit is used to transmit a generated stirring control signal to the controlled terminal of the first switching transistor. The first switching transistor is used to control the on / off state of its input and output terminals according to the level of the stirring control signal received by its controlled terminal. The drive motor is used to drive the stirrer to stir the milk placed in the milk cup when the input and output terminals of the first switching transistor are connected, and to stop stirring the milk placed in the milk cup when the input and output terminals of the first switching transistor are disconnected.

[0013] In one embodiment, the main control unit includes one of the following: a microcontroller (MCU), a digital signal processor (DSP), or a programmable logic device (FPGA).

[0014] Secondly, this application provides a technical solution as follows: an electromagnetic milk frother, including a milk frother and a control circuit for controlling the operation of the milk frother, wherein the control circuit is the control circuit of the electromagnetic milk frother described in the first aspect.

[0015] In some embodiments, the electromagnetic milk frother also includes a switching power supply module connected to the mains power grid, the switching power supply module being used to supply power to the electromagnetic milk frother.

[0016] Compared with related technologies, this embodiment provides an electromagnetic milk frother and its control circuit. The control circuit employs an IGBT heating module, a stirring module, a first temperature detection unit, and a second temperature detection unit, all electrically connected to a main control unit. The IGBT heating module is electrically connected to a heating unit located on the milk cup of the stirring module. The first temperature detection unit is located on the IGBT of the IGBT heating module, and the second temperature detection unit is located inside the milk cup. The main control unit controls the IGBT heating module to drive the heating unit to heat the milk cup and drives the stirring module to heat the milk cup. The milk in the cup is stirred to produce milk foam, and the first temperature corresponding to the IGBT is detected by the first temperature detection unit and the second temperature corresponding to the milk cup is detected by the second temperature detection unit. Furthermore, when at least one of the first temperature and the second temperature exceeds the corresponding preset temperature threshold, the main control unit controls the IGBT heating module to stop driving the heating unit to heat the milk cup. This solves the problem of poor taste and safety risks of milk foam produced by milk frothers, and achieves the beneficial effects of improving the taste of milk foam, avoiding excessively high milk foam temperature from affecting the taste and overheating damage to the equipment, and extending the service life of the milk frother.

[0017] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A structural block diagram of the control circuit of an electromagnetic milk frother provided in an embodiment of this application; Figure 2 A topology diagram is provided for a preferred embodiment of this application. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] The electric kettle and control circuit of this application will be described below with reference to the accompanying drawings in the embodiments of this application and through specific embodiments.

[0023] Figure 1 A structural block diagram of the control circuit of an electromagnetic milk frother provided in an embodiment of this application; Figure 2 This is a topology diagram provided for a preferred embodiment of the present application. The control circuit of the electromagnetic milk frother shown in the diagram is applied to an outsourced milk frother to effectively protect the temperature of the milk and the milk frother during the milk warming process, preventing the milk from overheating or the equipment from overheating, thus extending the service life of the milk frother and improving its performance.

[0024] Please see Figures 1 to 2 The control circuit of the electromagnetic milk frother in this application embodiment, used in an outsourced milk frother, includes an IGBT heating module 200, a stirring module 300, a first temperature detection unit 400, and a second temperature detection unit 500, all electrically connected to the main control unit 100. The IGBT heating module 200 is electrically connected to a heating unit 21 disposed on the milk cup 31 of the stirring module 300. The first temperature detection unit 400 is disposed on the IGBT 22 of the IGBT heating module 200. The second temperature detection unit 500 is disposed inside the milk cup 31. In this embodiment, the heating unit 21 includes a magnetic coil covering the sidewalls and bottom of the milk cup 31.

[0025] The main control unit 100 is used to control the IGBT heating module 200 to drive the heating unit 21 to heat the milk cup (31) and drive the stirring module 300 to stir the milk placed in the milk cup 31 to generate milk foam.

[0026] In this embodiment, the IGBT heating module 200 adopts an electromagnetic heating method. That is, the IGBT heating module 200 drives the magnetic coil corresponding to the heating unit 21 to resonate through the resonant circuit formed by the IGBT 21, thereby generating eddy currents in the magnetic coil to generate heat. During the use of the milk frother, the main control unit 100 controls and enables the IGBT heating module 200 to drive the magnetic coil to generate electromagnetic heat according to the needs, so as to heat the milk cup 31. After the milk cup 31 is heated, it heats the milk storage container placed in the milk cup 31 and containing milk.

[0027] In some embodiments, the main control unit 100 (reference) Figure 2 U2 in the example includes, but is not limited to, one of the following: a microcontroller (MCU), a digital signal processor (DSP), or a programmable logic device (FPGA); in this embodiment, the main control unit 100 is preferably a general-purpose microcontroller from Taixin Semiconductor.

[0028] In this embodiment, the main control unit 100 controls the stirring module 300 to stir and shake the milk in the milk cup 31, and the IGBT module 200 heats the milk cup 31 to generate milk foam.

[0029] The first temperature detection unit 400 is used to detect the first temperature corresponding to IGBT22.

[0030] In this embodiment, reference Figure 1 and Figure 2 The first temperature detection unit 400 includes a thermistor RT1 attached to the IGBT22. One end of the thermistor RT1 is electrically connected to a first resistor R34, a first capacitor C9, and the main control unit 100 (reference). Figure 2 In the network label AD_IGBT), the other end of the thermal sensor RT1 is grounded, the other end of the first resistor R34 is electrically connected to the first power supply (+5V), and the other end of the first capacitor C9 is grounded. The thermal sensor RT1 and the first resistor R34 form a voltage divider detection circuit. The thermal sensor RT1, along with IGBT22 (reference...), Figure 2 The temperature change of the IGBT1 in the circuit forms a corresponding voltage divider resistor, so that the voltage divider detection circuit generates a first voltage divider at the electrical connection point between the voltage divider resistor and the first resistor; the main control unit 100 is used to generate a first temperature based on the received first voltage divider.

[0031] In this embodiment, the thermal sensor RT1 is attached to the IGBT22, and when the IGBT22 heats up, the resistance of the thermal sensor RT1 will change accordingly, that is, the resistance will change according to the temperature. Then, when the main control unit 100 collects the voltage of the voltage detection point corresponding to the voltage divider detection circuit, the first voltage divider voltage representing the corresponding first temperature will be detected according to the voltage divider action of the voltage divider detection circuit.

[0032] The second temperature detection unit 500 is used to detect the corresponding second temperature inside the milk cup 31.

[0033] In some embodiments, the second temperature detection unit 500 includes, but is not limited to, one of the following: an NTC temperature detection sensor or an infrared thermometer.

[0034] In this embodiment, reference Figure 2One electrode of the second temperature detection unit 500 is electrically connected to the first power supply (+5V), and the other end is electrically connected to the electrical connection point of resistors R42 and R41. This other end serves as the detection point of the second temperature detection unit 500. Resistor R41 pulls the detection point down to ground to form a corresponding detection voltage at the detection point. Resistor R42 acts as a coupling resistor to couple the detection voltage corresponding to the detection point to the main control unit 100, thereby realizing the detection of the temperature inside the milk cup 31 and thus realizing the detection of milk temperature.

[0035] The main control unit 100 is also used to control the IGBT heating module 200 to stop driving the heating unit 21 to heat the milk cup 31 when at least one of the first temperature and the second temperature exceeds the corresponding preset temperature threshold.

[0036] In this embodiment, when the first temperature exceeds the set threshold, it indicates that the IGBT22 is overheating; when the second temperature exceeds the corresponding temperature threshold, it indicates that the heated milk has exceeded the set temperature and heating needs to be stopped. Otherwise, the milk temperature will be too high, causing the milk foam to have a poor texture (e.g., a burnt taste). At the same time, if the temperature is too high, there is also a risk of burns when the user drinks it.

[0037] In the control circuit of the aforementioned electromagnetic milk frother, an IGBT heating module 200, a stirring module 300, a first temperature detection unit 400, and a second temperature detection unit 500 are electrically connected to the main control unit 100. The IGBT heating module 200 is electrically connected to a heating unit 21 located on the milk cup 31 of the stirring module 300. The first temperature detection unit 400 is located on the IGBT 22 of the IGBT heating module 200, and the second temperature detection unit 500 is located inside the milk cup 31. The main control unit 100 controls the IGBT heating module 200 to drive the heating unit 21 to heat the milk cup 31 and drive the stirring module 300. The system stirs the milk placed in the milk cup 31 to generate milk foam, and detects the first temperature corresponding to the IGBT 22 through the first temperature detection unit 400 and the second temperature corresponding to the milk cup 31 through the second temperature detection unit. Furthermore, when at least one of the first temperature and the second temperature exceeds the corresponding preset temperature threshold, the main control unit controls the IGBT heating module 200 to stop driving the heating unit 21 to heat the milk cup 31. This solves the problem of poor taste and safety risks of milk foam produced by milk frothers, and achieves the beneficial effects of improving the taste of milk foam, avoiding excessively high milk foam temperature from affecting the taste and overheating damage to the equipment, and extending the service life of the milk frother.

[0038] To further achieve over-temperature protection for IGBTs, in some embodiments, reference is made to... Figure 2 The IGBT heating module 200 also uses a series thermal fuse (see reference). Figure 2The two connection ports (F2 and F3) are connected to the mains power grid.

[0039] In this embodiment, when the IGBT22 overheats and generates a large current, the thermal fuse will blow to protect the entire control circuit from overheating.

[0040] To heat the milk cup 31, refer to Figure 2 In some embodiments, the IGBT heating module 200 further includes a rectifier bridge BD1, an LC oscillation circuit (composed of an inductor L1 and a capacitor CY3), and a driver chip U3. The input terminal of the rectifier bridge BD1 is electrically connected to the mains power grid (in this embodiment, the rectifier bridge BD1 is connected after the EMI filter circuit, which is also electrically connected to the mains power grid). The output terminal of the rectifier bridge BD1 is electrically connected to the input terminal of the LC oscillation circuit. The output terminal of the LC oscillation circuit is electrically connected to one end of the heating unit 21. The other end of the heating unit 21 is electrically connected to the collector of the IGBT 22. The emitter of the IGBT 22 is connected to the emitter of the IGBT 22. The gate of the IGBT 22 is electrically connected to the power switch drive port of the driver chip. The control port of the driver chip is also electrically connected to the main control unit 100. In this embodiment, the heating unit 21 is also connected in parallel with the capacitor CY1. The main control unit 100 is used to generate switch start / stop signals.

[0041] The driver chip is used to generate a corresponding power switching signal based on the level of the received switch start / stop signal.

[0042] In this embodiment, the driver chip U3 includes, but is not limited to, one of the following: a driver chip of model M57962, a driver chip of model TLP250, a driver chip of model HSA6880, or a driver chip of model TX-KD101.

[0043] IGBT22 is used to control the switching between the collector and emitter of IGBT22 according to the level of the power switching signal received at the gate of IGBT22, so as to drive the heating unit 21 to heat up.

[0044] In this embodiment, when the IGBT is turned on, its collector voltage is 0V, and the magnetic coil begins to store energy. When the IGBT turns from on to off, the current still flows in the previous direction due to the energy storage effect of the magnetic coil. However, since the IGBT is off, the magnetic coil can only charge the high-frequency resonant capacitor CY1, causing the voltage on the IGBT collector to rise. As the charging current decreases until it reaches 0A, the voltage on the IGBT collector reaches its highest value. At this time, the high-frequency resonant capacitor CY1 begins to discharge to the magnetic coil, the IGBT collector voltage decreases, and then the drive pulse drives the IGBT to turn on again, and the LC oscillation circuit begins a new cycle. The magnetic coil and the high-frequency resonant capacitor CY1 continuously charge and discharge, forming a strong high-frequency resonance. Due to the high-power high-frequency current in the magnetic coil, high-power magnetic lines of force are radiated. These magnetic lines of force form eddy currents, thereby heating the milk cup 31.

[0045] In some embodiments, reference Figure 2 The stirring module 300 also includes a motor drive module 32, which controls a drive motor 33 electrically connected to the milk cup 31. The motor drive module 32 includes a first switching transistor Q1, the input terminals of which are respectively connected to the drive motor 33 (see reference). Figure 2 The first electrode of the connection terminal CN1 is electrically connected to the anode of the first Zener diode D8. The second electrode of the drive motor 33 is electrically connected to the cathode of the first Zener diode D8 and the first pull-up resistor R35. The controlled terminal of the first switch Q1 is electrically connected to the main control unit 100 through a series second resistor R30. The output terminal of the first switch Q1 is connected to ground through a series third resistor R36. The main control unit 100 is used to transmit the generated stirring control signal to the controlled terminal of the first switching tube Q1.

[0046] The first switch Q1 is used to control the on / off state of the input and output terminals of the first switch Q1 according to the level of the stirring control signal received by the controlled terminal of the first switch Q1.

[0047] In this embodiment, when the level of the stirring control signal is a preset high level (represented by binary "1", the actual level is higher than +3V, for example: +5V), the input terminal and output terminal of the first switch Q1 are connected; when the level of the stirring control signal is a preset low level (represented by binary "0", the actual level is less than +3V), the input terminal and output terminal of the first switch Q1 are disconnected.

[0048] The first switching transistor Q1 in the embodiments of this application includes, but is not limited to, a transistor, a MOSFET, and a field-effect transistor. Furthermore, based on the disclosure of this application, those skilled in the art will readily conceive of modifying the first switching transistor Q1 disclosed in this application to a motor drive module 32 adapted to the specific selection of the switching transistor. Therefore, this application can be implemented regardless of whether the first switching transistor is an NPN or PNP transistor, an N-channel or P-channel switching MOSFET, or an N-type or P-type field-effect transistor; no limitation is made in the embodiments of this application.

[0049] The drive motor 33 is used to drive the stirrer to stir the milk placed in the milk cup 31 when the input end and output end of the first switch tube Q1 are connected, and to stop stirring the milk placed in the milk cup 31 when the input end and output end of the first switch tube Q1 are disconnected.

[0050] This application also provides an electromagnetic milk frother, including a milk frother and a control circuit for controlling the operation of the milk frother, wherein the control circuit is the control circuit of the electromagnetic milk frother in the above embodiment.

[0051] In some embodiments, the electromagnetic milk frother also includes a switching power supply module connected to the mains power grid, which supplies power to the electromagnetic milk frother.

[0052] This switching power supply module: The EMC filter circuit includes a varistor CNR1, a resistor R25, a diode U5, a resistor R29, a filter capacitor CY2, and an EMI inductor L4. Resistor R25, diode U5, and resistor R29 are connected in series, then connected in parallel with varistor X1 and filter capacitor X1 to form an EMI filter unit. The input terminal of the EMI filter unit is connected to the mains power grid (reference). Figure 2 The AC-L and AC-N connections are in place, and its output is electrically connected to the rectifier unit through the series EMI inductor L4.

[0053] The rectifier unit includes a rectifier diode D10, a resistor R1, and a filter capacitor EC2. The rectifier diode D10 and the resistor R1 form a half-wave rectifier circuit, which rectifies the mains voltage into DC voltage and then sends it to the switching power supply chip U1.

[0054] The control circuit includes a switching power supply control chip U1. The input terminal of the switching power supply control chip U1 is electrically connected to the rectified voltage and is started by the DC voltage provided by the rectifier unit. The feedback port of the switching power supply control chip U1 is electrically connected to the same-name terminal of the primary winding of the inverter transformer T1. The output terminal VDD of the switching power supply control chip U1 is electrically connected to the other end of the primary winding. The secondary winding of the inverter transformer T1 is electrically connected to the input terminal of the linear three-terminal regulator U4 through a series rectifier diode D3 and a coupling resistor R4. The electrical connection point of the rectifier diode D3 and the coupling resistor R4 is also connected to the high-voltage output port through a freewheeling diode Z2 and a resistor 23. The switching power supply control chip U1 is used to control the internal power switch to turn on / off by acquiring the voltage signal reflecting the voltage of the same terminal of the primary winding, so that the inverter transformer T1 converts the corresponding DC voltage into a high-frequency square wave pulse voltage and outputs it along the secondary winding. The rectifier diode D3 and the coupling resistor R4 form a voltage regulator circuit to regulate the high-frequency square wave pulse voltage to a +9V output voltage.

[0055] The linear three-terminal Zener diode U4 is used to regulate the +9V voltage to the +5V voltage corresponding to the first power supply.

[0056] In this embodiment, the linear three-terminal Zener diode U4 includes, but is not limited to, the LM-1117-5 type Zener chip.

[0057] The freewheeling diode Z2 and resistor 23 also convert the voltage output along the cathode of the rectifier diode D3 into a +18V voltage for use by the drive motor and IGBT.

[0058] It should be noted that the switching power supply in this application embodiment can also be one of the existing switching power supplies, which will not be described in detail here.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive elements that are not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0060] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A control circuit for an electromagnetic milk frother, characterized in that, The system includes an IGBT heating module (200) electrically connected to the main control unit (100), a stirring module (300), a first temperature detection unit (400), and a second temperature detection unit (500). The IGBT heating module (200) is electrically connected to a heating unit (21) located on the milk cup (31) of the stirring module (300). The first temperature detection unit (400) is located on the IGBT (22) of the IGBT heating module (200), and the second temperature detection unit (500) is located inside the milk cup (31). The main control unit (100) is used to control the IGBT heating module (200) to drive the heating unit (21) to heat the milk cup (31), and to drive the stirring module (300) to stir the milk placed in the milk cup (31) to generate milk foam; The first temperature detection unit (400) is used to detect the first temperature corresponding to the IGBT (22); The second temperature detection unit (500) is used to detect the corresponding second temperature inside the milk cup (31); The main control unit (100) is also used to control the IGBT heating module (200) to stop driving the heating unit (21) to heat the milk cup (31) when at least one of the first temperature and the second temperature exceeds the corresponding preset temperature threshold.

2. The control circuit of the electromagnetic milk frother according to claim 1, characterized in that, The first temperature detection unit (400) includes a thermistor sensor attached to the IGBT (22). One end of the thermistor sensor is electrically connected to a first resistor, a first capacitor, and the main control unit (100). The other end of the thermistor sensor is grounded. The other end of the first resistor is electrically connected to a first power supply. The other end of the first capacitor is grounded. The thermistor sensor and the first resistor form a voltage divider detection circuit. The thermal sensor forms a corresponding voltage divider resistor as the temperature of the IGBT (22) changes, so that the voltage divider detection circuit generates a first voltage divider at the electrical connection point between the voltage divider resistor and the first resistor. The main control unit (100) is used to generate the first temperature based on the received first voltage divider voltage.

3. The control circuit of the electromagnetic milk frother according to claim 1, characterized in that, The second temperature detection unit (500) includes one of the following: an NTC temperature sensor or an infrared thermometer.

4. The control circuit of the electromagnetic milk frother according to claim 1, characterized in that, The heating unit (21) includes a magnetic coil covering the sidewalls and bottom of the milk cup (31).

5. The control circuit of the electromagnetic milk frother according to claim 4, characterized in that, The IGBT heating module (200) is also connected to the mains power grid via a series thermal fuse.

6. The control circuit of the electromagnetic milk frother according to claim 5, characterized in that, The IGBT heating module (200) further includes a rectifier bridge, an LC oscillation circuit, and a driver chip. The input terminal of the rectifier bridge is electrically connected to the mains power grid, and the output terminal of the rectifier bridge is electrically connected to the input terminal of the LC oscillation circuit. The output terminal of the LC oscillation circuit is electrically connected to one end of the heating unit (21), and the other end of the heating unit (21) is electrically connected to the collector of the IGBT (22). The emitter of the IGBT (22) is connected to the gate of the IGBT (22), and the gate of the IGBT (22) is electrically connected to the power switch drive port of the driver chip. The control port of the driver chip is also electrically connected to the main control unit (100). The main control unit (100) is used to generate switch start / stop signals; The driver chip is used to generate a corresponding power switch signal based on the level of the received switch start / stop signal; The IGBT (22) is used to control the switching between the collector and emitter of the IGBT (22) according to the level of the power switching signal received by the gate of the IGBT (22), so as to drive the heating unit (21) to heat up.

7. The control circuit of the electromagnetic milk frother according to claim 1, characterized in that, The stirring module (300) further includes a motor drive module (32), which controls a drive motor (33) electrically connected to the stirrer. The motor drive module (32) includes a first switching transistor. The input terminal of the first switching transistor is electrically connected to the first electrode of the drive motor (33) and the anode of the first Zener diode, respectively. The second electrode of the drive motor (33) is electrically connected to the cathode of the first Zener diode and the first pull-up resistor, respectively. The controlled terminal of the first switching transistor is electrically connected to the main control unit (100) via a second resistor in series. The output terminal of the first switching transistor is connected to ground via a third resistor in series. The main control unit (100) is used to transmit the generated stirring control signal to the controlled end of the first switching tube; The first switching transistor is used to control the on / off state of the input and output terminals of the first switching transistor according to the level of the stirring control signal received by the controlled terminal of the first switching transistor. The drive motor (33) is used to drive the stirrer to stir the milk placed in the milk cup (31) when the input end and output end of the first switch tube are connected, and to stop stirring the milk placed in the milk cup (31) when the input end and output end of the first switch tube are disconnected.

8. The control circuit of the electromagnetic milk frother according to any one of claims 1 to 7, characterized in that, The main control unit (100) includes one of the following: a microcontroller (MCU), a digital signal processor (DSP), or a programmable logic device (FPGA).

9. An electromagnetic milk frother, comprising a milk frother and a control circuit for controlling the operation of the milk frother, characterized in that, The control circuit includes the control circuit of the electromagnetic milk frother as described in any one of claims 1 to 7.

10. The electromagnetic milk frother according to claim 9, characterized in that, It also includes a switching power supply module that is connected to the municipal power grid, the switching power supply module being used to supply power to the electromagnetic milk frother.

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