CN219895414U

CN219895414U - Multifunctional milk mixer and control circuit thereof

Info

Publication number: CN219895414U
Application number: CN202320729319.2U
Authority: CN
Inventors: 謝雪群; 唐强国; 杨晓博
Original assignee: Zhongyun Interactive Investment Development Shenzhen Co ltd
Current assignee: Zhongyun Interactive Investment Development Shenzhen Co ltd
Priority date: 2023-03-29
Filing date: 2023-03-29
Publication date: 2023-10-27
Anticipated expiration: 2033-03-29

Abstract

The application provides a multifunctional milk mixer and a control circuit thereof, wherein the control circuit comprises a zero-crossing detection circuit, a temperature sensing circuit, a controller, a first heating control circuit and a power supply circuit, the controller outputs a corresponding first heating control signal according to a zero-crossing detection signal output by the zero-crossing detection circuit and a temperature sensing signal output by the temperature sensing circuit so as to control the on-off state of a second triode in the first heating control circuit, thereby the heating time and the heating power of a heating plate are manufactured, the heating power of the multifunctional milk mixer is adjustable, the zero-crossing detection circuit mainly comprises a triode and a resistor, the first heating control circuit is a heating switch control circuit comprising a bidirectional silicon controlled rectifier and a triode, and the zero-crossing detection circuit and the first heating control circuit are both simple in structure and easy to realize, and are beneficial to reducing the cost of the multifunctional milk mixer.

Description

Multifunctional milk mixer and control circuit thereof

Technical Field

The application relates to the technical field of milk regulators, in particular to a multifunctional milk regulator and a control circuit thereof.

Background

The milk mixer is a household appliance mother and infant product commonly used in families, is mainly used for mixing milk for infants, assisting in feeding and the like, and can be used for mixing beverages such as brewed fruit juice and the like. The existing multifunctional milk mixer generally has milk mixing, water heating and sterilizing functions, and mainly comprises a heating component and a sterilizing component, wherein the heating component mainly realizes the heating and milk mixing functions of the multifunctional milk mixer on liquid, and the sterilizing component mainly realizes the sterilizing functions of the multifunctional milk mixer.

The multifunctional milk mixer controls the heating component and the sterilizing component to realize corresponding functions through the control circuit board arranged in the base of the multifunctional milk mixer, so that the control circuit structure corresponding to the control circuit board is complex and difficult, the realization cost and the electrical performance are critical to the performance of the multifunctional milk mixer. In order to realize the regulation and control of the heating power of the heating component, the control circuit of the existing multifunctional milk mixer has a complex structure, high realization cost and is not beneficial to reducing the production cost of the multifunctional milk mixer.

Disclosure of Invention

In order to solve the existing technical problems, the utility model provides the low-cost multifunctional milk mixer with simple structure and easy realization and the control circuit thereof.

According to a first aspect of embodiments of the present utility model, there is provided a control circuit of a multi-functional milk mixer including a heating assembly including a heat generating tray and a liquid container provided on the heat generating tray for containing a heated liquid, and a sterilizing assembly including a sterilizing chamber and an ultraviolet lamp located in the sterilizing chamber for emitting ultraviolet rays to sterilize a sterilized object placed in the sterilizing chamber, the control circuit including a zero-crossing detection circuit, a temperature sensing circuit, a controller, a first heating control circuit, and a power supply circuit;

The zero-crossing detection circuit is used for detecting zero-crossing voltage of an alternating current zero line end and outputting a zero-crossing detection signal to the controller, and comprises a first resistor, a first triode, a second resistor, a third resistor and a first capacitor, wherein the first end of the first resistor is connected with the alternating current zero line end, the second end of the first resistor is connected with a base electrode of the first triode, a collector electrode of the first triode is connected with the first end of the second resistor, the second end of the second resistor is used for receiving a supply voltage, the first end of the third resistor is connected with the collector electrode of the first triode, the second end of the third resistor is connected with the controller and is used for outputting the zero-crossing detection signal to the controller, the first end of the first capacitor is connected with the second end of the third resistor, and the second end of the first capacitor and an emitter electrode of the first triode are respectively grounded;

the temperature sensing circuit is used for sensing the temperature of the heated liquid heated by the heating plate and outputting a temperature sensing signal to the controller;

the controller outputs a corresponding first heating control signal according to the zero-crossing detection signal and the temperature signal;

The first heating control circuit is used for driving the heating disc to generate heat, wherein the first heating control circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a second triode and a first bidirectional thyristor, a first end of the fourth resistor is connected with the controller and is used for receiving the first heating control signal, a second end of the fourth resistor is connected with a base electrode of the second triode, a first end of the fifth resistor is connected with a base electrode of the second triode, a second end of the fifth resistor and an emitter electrode of the second triode are respectively grounded, a collector electrode of the second triode is connected with a first end of the sixth resistor, a second end of the sixth resistor is connected with a control terminal of the first bidirectional thyristor, a first main terminal of the first bidirectional thyristor is connected with a first electrode terminal of the heating disc, a second electrode terminal of the heating disc is connected with an alternating current zero terminal, and a second main terminal of the first bidirectional thyristor is connected with an alternating current zero terminal;

the power supply circuit comprises an alternating current-to-direct current circuit and a direct current-to-direct current circuit connected with a direct current voltage output end of the alternating current-to-direct current circuit, a first input end of the alternating current-to-direct current circuit is connected with an alternating current zero line end, a second input end of the alternating current-to-direct current circuit is connected with an alternating current live line end, the alternating current-to-direct current circuit is used for converting alternating current voltage output by an alternating current power supply into a first direct current voltage, the first direct current voltage is used for supplying power to the ultraviolet disinfection lamp, the direct current-to-direct current circuit is used for converting the first direct current voltage into a second direct current voltage, and the second direct current voltage is used for supplying power to the zero-crossing detection circuit and the temperature sensing circuit respectively.

In some embodiments, the ac-to-dc circuit includes a momentary interruption protection circuit connected to the ac live line end, a grid surge impact resistance circuit connected between the ac live line end and the ac live line end, and a flyback isolated ac-to-dc switching power supply circuit connected to an output of the grid surge resistance circuit.

In some embodiments, the dc-dc circuit includes a seventh resistor, a three-terminal voltage stabilizing chip, a second capacitor, and a third capacitor, where a first end of the seventh resistor is connected to the dc voltage output end of the ac-dc circuit, a second end of the seventh resistor is connected to the input end of the three-terminal voltage stabilizing chip, the output end of the three-terminal voltage stabilizing chip outputs the second dc voltage, the ground of the three-terminal voltage stabilizing chip is grounded, a first end of the second capacitor and a first end of the third capacitor are respectively connected to the output end of the three-terminal voltage stabilizing chip, and a second end of the second capacitor and a second end of the third capacitor are respectively grounded.

In some embodiments, the temperature sensing circuit includes a temperature sensor, an eighth resistor, a ninth resistor, and a fourth capacitor, where the temperature sensor is configured to sense a temperature of the heated liquid, a first end of the temperature sensor is respectively connected to the first end of the eighth resistor and the first end of the ninth resistor, a second end of the eighth resistor is configured to receive the second dc voltage, a second end of the ninth resistor is configured to output the temperature sensing signal to the controller, a first end of the fourth capacitor is connected to a second end of the ninth resistor, and a second end of the temperature sensor and a second end of the fourth capacitor are respectively grounded.

In some embodiments, a buzzer circuit connected to the temperature sensing circuit is also included;

the buzzer circuit comprises a fifth capacitor and a buzzer, wherein a first end of the fifth capacitor is connected with the output end of the temperature sensing circuit and is used for receiving the temperature sensing signal, a second end of the fifth capacitor is connected with a first electrode end of the buzzer, and a second electrode end of the buzzer is used for receiving the second direct-current voltage.

In some embodiments, the disinfection assembly further comprises a PTC heating tube disposed in the disinfection chamber, the control circuit further comprises a second heating control circuit for driving the PTC heating tube to generate heat, wherein the second heating control circuit comprises a tenth resistor, an eleventh resistor, a twelfth resistor, a third triode and a second bidirectional thyristor, a first end of the tenth resistor is connected with the controller and is used for receiving a second heating control signal output by the controller, a second end of the tenth resistor is connected with a base of the third triode, a first end of the eleventh resistor is connected with a base of the third triode, a second end of the eleventh resistor and an emitter of the third triode are respectively grounded, a collector of the third triode is connected with a first end of the twelfth resistor, a second end of the twelfth resistor is connected with a control terminal of the second bidirectional thyristor, a first main terminal of the second bidirectional thyristor is connected with a first main terminal of the PTC heating tube, a first end of the eleventh resistor is connected with a second main terminal of the PTC heating tube, and a second main terminal of the PTC heating tube is connected with a second main terminal of the PTC heating tube.

In some embodiments, the sterilization assembly further comprises a fan for blowing air into the sterilization chamber, and the control circuit further comprises a fan driving circuit for driving the fan to work according to a fan control signal output by the controller;

the fan driving circuit comprises a thirteenth resistor, a fourteenth resistor, an MOS tube, a first diode and a fifteenth resistor, wherein a first end of the thirteenth resistor is connected with a fan control output end of the controller and used for receiving the fan control signal, a second end of the thirteenth resistor is respectively connected with a controlled end of the MOS tube and a second end of the fourteenth resistor, a current output end of the MOS tube and a second end of the fourteenth resistor are respectively grounded, a current input end of the MOS tube is respectively connected with a first electrode end of the fan and an anode of the first diode, a cathode of the first diode is respectively connected with a second electrode end of the fan and a first end of the fifteenth resistor, and a second end of the fifteenth resistor is used for receiving the first direct voltage.

In some embodiments, the ultraviolet lamp power supply control circuit is further included, a power supply end of the ultraviolet lamp control circuit is used for receiving the first direct-current voltage, and the ultraviolet lamp power supply control circuit is used for controlling the first direct-current voltage to supply power for the ultraviolet lamp according to an ultraviolet disinfection control signal output by the controller so as to drive the ultraviolet lamp to emit ultraviolet rays for ultraviolet disinfection.

In some embodiments, the ultraviolet lamp further comprises a constant current control circuit connected with the ultraviolet lamp, wherein the constant current control circuit is used for providing constant current driving for the ultraviolet lamp.

According to a second aspect of embodiments of the present application, there is provided a multi-functional milk mixer comprising a heating assembly, a sterilizing assembly and a control circuit according to any one of the preceding claims, the heating assembly comprising a heat-generating plate and a liquid container provided on the heat-generating plate for containing a heated liquid, the heat-generating plate being adapted to heat the heated liquid, the sterilizing assembly comprising a sterilizing chamber and an ultraviolet lamp located in the sterilizing chamber, the ultraviolet lamp being adapted to emit ultraviolet light for ultraviolet sterilization of a sterilized object placed in the sterilizing chamber.

As can be seen from the above, the control circuit of the multifunctional milk mixer provided by the first embodiment of the application comprises a zero-crossing detection circuit, a temperature sensing circuit, a controller, a first heating control circuit and a power supply circuit, wherein the controller outputs a corresponding first heating control signal according to the zero-crossing detection signal output by the zero-crossing detection circuit and the temperature sensing signal output by the temperature sensing circuit, so as to control the on-off state of the second triode in the first heating control circuit, thereby making the heating time and the heating power of the heating plate, and making the heating power of the multifunctional milk mixer adjustable, wherein the zero-crossing detection circuit mainly comprises a triode and a resistor, the first heating control circuit is a heating switch control circuit comprising a bidirectional thyristor and a triode, and the zero-crossing detection circuit and the first heating control circuit are both simple in structure and easy to realize, thereby being beneficial to reducing the cost of the multifunctional milk mixer.

Drawings

Fig. 1 is a block diagram of a control circuit of a multifunctional milk mixer according to a first embodiment of the present application;

fig. 2 is a circuit diagram showing an implementation of an ac-dc circuit in a control circuit of a multifunctional milk mixer according to a second embodiment of the present application;

fig. 3 is a circuit diagram showing a specific implementation of a dc-dc circuit in a control circuit of a multifunctional milk mixer according to a third embodiment of the present application;

FIG. 4 is a circuit diagram showing one embodiment of a temperature sensing circuit in a control circuit of a multi-function milk mixer according to a fourth embodiment of the present application;

FIG. 5 is a circuit diagram showing a buzzer circuit in a control circuit of a multi-functional milk mixer according to a fifth embodiment of the present application;

FIG. 6 is a circuit diagram showing a specific implementation of a second heating control circuit in a control circuit of a multi-function milk mixer according to a sixth embodiment of the present application;

fig. 7 is a circuit diagram showing a specific implementation of a fan driving circuit in a control circuit of a multifunctional milk mixer according to a seventh embodiment of the present application.

Detailed Description

The technical scheme of the application is further elaborated below by referring to the drawings in the specification and the specific embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the implementations of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and for example, they may be directly connected, or they may be indirectly connected through an intermediate medium, or they may be in communication with each other between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Fig. 1 is a block diagram illustrating a control circuit of a multifunctional milk mixer according to a first embodiment of the present application. In a first embodiment, the multifunctional milk mixer comprises a heating assembly and a sterilizing assembly, wherein the heating assembly comprises a heating plate and a liquid container arranged on the heating plate and used for containing heated liquid, the heating plate is used for heating the heated liquid, the sterilizing assembly comprises a sterilizing chamber and an ultraviolet lamp positioned in the sterilizing chamber, and the ultraviolet lamp is used for emitting ultraviolet rays so as to sterilize objects placed in the sterilizing chamber by ultraviolet rays. The control circuit of the multifunctional milk regulator comprises a zero crossing detection circuit 3, a temperature sensing circuit 5, a controller 4, a first heating control circuit 2 and a power supply circuit 1.

The ZERO-crossing detection circuit 3 is configured to detect a ZERO-crossing voltage at an ac ZERO-line terminal ACN, and output a ZERO-crossing detection signal ZERO to the controller. The ZERO-crossing detection circuit 3 comprises a first resistor, a first triode Q7, a second resistor R35, a third resistor R36 and a first capacitor C8, wherein the first end of the first resistor is connected with an alternating current ZERO-line end ACN, the second end of the first resistor is connected with the base electrode of the first triode Q7, the collector electrode of the first triode Q7 is connected with the first end of the second resistor R35, the second end of the second resistor R35 is used for receiving a power supply voltage VDC2, the first end of the third resistor R36 is connected with the collector electrode of the first triode Q7, the second end of the third resistor R36 is connected with the controller 4 and used for outputting a ZERO-crossing detection signal ZERO to the controller 4, the first end of the first capacitor C8 is connected with the second end of the third resistor R35, and the second end of the first capacitor C8 and the emitter electrode of the first triode Q7 are respectively grounded. The first resistor may be formed by connecting a resistor JR11, a resistor R38, and a resistor R39 in series, that is, a first end of a series branch formed by connecting the resistor JR11, the resistor R38, and the resistor R39 in series is a first end of the first resistor, and a second end of the series branch is a second end of the first resistor.

The temperature sensing circuit 5 is used for sensing the temperature of the heated liquid heated by the heating plate 01 and outputting a temperature sensing signal NTC to the controller 4. The controller 4 outputs a corresponding first heating control signal HEAT according to magnitudes of the temperature sensing signal NTC and the ZERO-crossing detection signal ZERO. Specifically, the controller 4 controls the output of the first heating control signal HEAT according to the magnitude of the temperature sensing signal NTC, so as to control the heating working time of the heating disc 01, and when the temperature sensing signal NTC reaches a set value, the first heating control signal HEAT controls the heating disc 01 to stop heating so as to stop heating the heated liquid. The controller 4 controls the magnitude of the heat generation power of the heat generation panel 01 according to the ZERO-crossing detection signal ZERO.

The first heating control circuit 2 is used for driving the heating plate 01 to generate heat. The first heating control circuit 2 includes a fourth resistor R23, a fifth resistor R25, a sixth resistor, a second triode Q1, and a first triac SCR1, where a first end of the fourth resistor R23 is connected to the controller 4 and is configured to receive the first heating control signal HEAT, a second end of the fourth resistor R23 is connected to a base of the second triode Q1, a first end of the fifth resistor R25 is connected to a base of the second triode Q1, a second end of the fifth resistor R25 and an emitter of the second triode Q1 are grounded respectively, a collector of the second triode Q1 is connected to a first end of the sixth resistor, a second end of the sixth resistor is connected to a control terminal of the first triac SCR1, a first main terminal of the first triac SCR1 is connected to a first end of the heating coil 01, a second electrode terminal of the heating coil 01 is connected to a first ac terminal of the triac SCR1, and a first ac terminal of the first triac SCR1 is connected to a first ac terminal. The sixth resistor may be formed by connecting a resistor R18 and a resistor R19 in series, that is, a first end of a series branch formed by connecting the resistor R18 and the resistor R19 in series is a first end of the sixth resistor, and a second end of the series branch is a second end of the sixth resistor.

The power supply circuit 1 comprises an ac-dc converting circuit 11 and a dc-dc converting circuit 12 connected to a dc voltage output end of the ac-dc converting circuit 11, a first input end of the ac-dc converting circuit 11 is connected to the ac zero line end ACN, a second input end of the ac-dc converting circuit 11 is connected to the ac live line end ACL, the ac-dc converting circuit 11 is used for converting an ac voltage output by an ac power supply into a first dc voltage VDC1, the first dc voltage VDC1 is used for supplying power to the ultraviolet disinfection lamp, the dc-dc converting circuit 12 is used for converting the first dc voltage VDC1 into a second dc voltage VDC2, and the second dc voltage VDC2 is used for supplying power to the zero-cross detection circuit 3 and the temperature sensing circuit 5, i.e., the second dc voltage VDC2 is the power supply voltage of the zero-cross detection circuit 3 and the temperature sensing circuit 5, respectively. Specifically, the second dc voltage VDC2 is generally smaller than the first dc voltage VDC1, for example, the first dc voltage VDC1 is 14V and the second dc voltage VDC2 is 5V.

As can be seen from the above, the control circuit of the multifunctional milk regulator provided according to the first embodiment of the present application includes the ZERO-crossing detection circuit 3, the temperature sensing circuit 5, the controller 4, the first heating control circuit 2 and the power supply circuit 1, the controller 4 outputs the corresponding first heating control signal HEAT according to the ZERO-crossing detection signal ZERO output by the ZERO-crossing detection circuit 3 and the temperature sensing signal NTC output by the temperature sensing circuit 5, so as to control the on-off state of the second triode Q1 in the first heating control circuit 2, thereby making the heating time and the heating power of the heating disc 01, and making the heating power of the multifunctional milk regulator adjustable, wherein the ZERO-crossing detection circuit 3 is mainly composed of the triode and the resistor, and the first heating control circuit 2 is a heating switch control circuit composed of the first triac SCR1 and the second triode Q1, and both the ZERO-crossing detection circuit and the first heating control circuit are simple in structure and easy to implement, thereby being beneficial to reducing the cost of the multifunctional milk regulator.

In some embodiments, the ac-dc converting circuit 11 includes a momentary interruption protection circuit connected to the ac live line terminal ACL, a power grid surge impact resistance circuit connected between the ac live line terminal ACN and the ac live line terminal ACL, and a flyback isolated ac-dc switching power supply circuit connected to an output terminal of the power grid surge resistance circuit. Specifically, please refer to fig. 2, which is a circuit diagram illustrating an implementation of an ac-dc circuit in a control circuit of a multifunctional milk regulator according to a second embodiment of the present application. In the second embodiment, the instantaneous interruption protection circuit in the ac-dc circuit 11 includes a fuse F1, a first end of which is connected to the ac live wire terminal, and a second end of which F2 is connected to the power grid surge impact resistant circuit. The power grid surge impact resistance circuit comprises a piezoresistor ZNR, a capacitor CX1, capacitors CY1 and CY2, a resistor R11 and a resistor R14. The first end of the piezoresistor ZNR is connected with the AC zero line end ACN, the second end of the piezoresistor ZNR is connected with the second end of the fuse F1, the capacitor CY1 is connected with the piezoresistor ZNR in parallel, the first end of the capacitor CY1 is connected with the AC zero line end ACN, the second end of the capacitor CY1 is connected with the first end of the capacitor CY2, the second end of the capacitor CY2 is connected with the AC fire line end ACL, the first end of the resistor R11 is connected with the AC zero line end ACN, the second end of the resistor R11 is connected with the first end of the resistor R14, and the second end of the resistor R14 is connected with the AC fire line end ACL.

The flyback isolated AC-DC switching power supply circuit comprises a half-bridge filter circuit, a pi-type filter circuit, a flyback isolated AC-DC switching power supply chip, a starting circuit, a clamping follow current, a transformer, a switching power supply chip power supply circuit and an output circuit. The half-bridge filter circuit is connected with the output end of the power grid surge impact resistant circuit and used for rectifying signals output by the power grid surge impact resistant circuit, and the pi-type filter circuit is connected with the output end of the half-bridge rectifier circuit and used for filtering signals output by the half-bridge rectifier circuit. The flyback isolated alternating current-to-direct current switching power supply chip is used for controlling the flyback isolated alternating current-to-direct current switching power supply circuit to convert an alternating current voltage signal into a direct current voltage signal. And the flyback isolated AC-DC switching power supply chip is integrated with a main power switching tube and a switching control circuit of the main power switching tube of the flyback isolated AC-DC switching power supply circuit. The starting circuit is connected between the output end of the pi-type filter circuit and a starting pin of the flyback isolated alternating current-to-direct current switching power supply chip and is used for providing starting current for the flyback isolated alternating current-to-direct current switching power supply chip. The clamping and freewheeling circuit is connected between two terminals of the primary winding of the transformer and is used for clamping the input voltage of the primary winding of the transformer and freewheeling the current of the primary winding. The output circuit is connected between two terminals of the secondary winding of the transformer for outputting a first direct voltage VDC1. The switching power supply chip power supply circuit is used for generating the power supply voltage of the flyback isolated alternating current-to-direct current switching power supply chip according to the voltage on the secondary winding.

With continued reference to fig. 2, in particular, the half-bridge rectifying circuit includes a resistor R4, a diode D1, and a diode D2 connected in series. And a first end of a series circuit formed by the R4, the diode D1 and the diode D2 is connected with the alternating current zero line end CAN, and a second end is an output end of the half-bridge rectifying circuit. The pi-type filter circuit comprises a resistor L1, a capacitor EC4 and a capacitor EC3, wherein a first end of the capacitor EC4 is connected with an output end of the half-bridge rectifier circuit, a second end of the capacitor EC4 is connected with a second end of the fuse F1, a first end of the inductor L1 is connected with a first end of the capacitor EC4, a second end of the inductor L1 is connected with a first end of the capacitor EC3, and a second end of the capacitor EC3 is connected with a second end of the capacitor EC4 and outputs a first direct current voltage VDC1. The flyback isolated AC-DC switching power supply chip U2 comprises a starting pin VST, a power supply pin VCC, a grounding pin GND, a current sampling pin CS, a voltage feedback pin VFB and a high-voltage pin HV, wherein the starting pin VST is connected with the output end of the starting circuit, the power supply pin VCC is used for receiving a power supply voltage VCC, the current sampling pin CS is used for receiving a sampling current signal of the input current of a main power switch tube in the flyback isolated AC-DC switching power supply chip U2, the current pin CS is respectively connected with the first ends of resistors R16 and R15, the second ends of the resistor R16 and the resistor R15 are respectively grounded, the voltage feedback pin VFB is respectively connected with the first ends of a resistor R17 and a capacitor C5, and the second ends of the resistor R17 and the capacitor C5 are respectively grounded. The grounding pin GND is used for grounding, and the high-voltage pin HV is connected with a high-voltage input end of a main power switch tube in the flyback isolation AC-DC switch power supply chip U2 and is used for being connected with the clamping follow current and the primary winding respectively. The clamping follow current circuit comprises a capacitor C2, a resistor R7, a resistor R8 and a diode D4, wherein a first end of the capacitor C2 is connected with the output end of the pi-type filter circuit, a second end of the capacitor C2 is connected with the cathode of the diode D4, the anode of the diode D4 is connected with a high-voltage cathode HV, first ends of the resistors R7 and R8 are respectively connected with the first end of the capacitor C2, and second ends of the resistors R7 and R8 are respectively connected with the cathode of the diode D4. A first end of the capacitor C2 is connected to a first terminal of the primary winding of the transformer T1, and the high voltage pin HV is connected to a second terminal of the primary winding of the transformer T1. The output circuit comprises a diode D3, a capacitor EC1, a resistor R10, a capacitor C3, a resistor R1 and a capacitor C1, wherein the cathode of the diode D3 is connected with a first terminal of a secondary winding of the transformer T, the anode of the diode D3 is connected with a first end of the capacitor EC1, a second end of the capacitor EC1 is connected with a second terminal of the secondary winding of the transformer T1, the resistor R10 and the capacitor C3 are respectively connected in parallel with the capacitor EC1, the capacitor C1 and the resistor R1 are connected between the anode and the cathode of the diode D3 in series, the first end of the capacitor C3 is connected with the anode of the diode D3, and the second end of the capacitor C3 outputs the first direct current voltage VDC1. The switching power supply chip power supply circuit comprises a diode D5, a voltage stabilizing diode ZD1, a capacitor EC5 and an EC6, wherein the anode of the diode D5 is connected with a third wiring terminal of a secondary winding of the transformer T1, the cathode of the diode D5 is connected with the cathode of the voltage stabilizing diode ZD1, the anode of the voltage stabilizing diode ZD1 is connected with a first end of the capacitor EC6, a second end of the capacitor EC6 is grounded, a first end of the capacitor EC5 is connected with a cathode end of the voltage stabilizing diode ZD1, a second end of the capacitor EC5 is grounded, and a first end of the capacitor EC6 outputs the power supply voltage VCC of the flyback isolation AC-DC switching power supply chip U2. The alternating current-to-direct current circuit provided by the embodiment of the application has a simple structure and is easy to realize.

Fig. 3 is a circuit diagram showing a specific implementation of a dc-dc circuit in a control circuit of a multifunctional milk regulator according to a third embodiment of the present application. In the third embodiment, the dc-dc conversion circuit 12 includes a seventh resistor, a three-terminal voltage stabilizing chip U1, a second capacitor EC2, and a third capacitor C4, where a first end of the seventh resistor is connected to the dc voltage output end of the ac-dc conversion circuit 11, and is configured to receive the first dc voltage VDC1. The second end of the seventh resistor is connected to the input end VI N of the three-terminal voltage stabilizing chip U1, the output end OUT of the three-terminal voltage stabilizing chip U1 outputs the second direct current voltage VDC1, the ground end GND of the three-terminal voltage stabilizing chip U1 is grounded, the first end of the second capacitor EC2 and the first end of the third capacitor C4 are respectively connected to the output end OUT of the three-terminal voltage stabilizing chip U1, and the second end of the second capacitor EC4 and the second end of the third capacitor C4 are respectively grounded. The seventh resistor is formed by connecting resistors R2, R3, R5, R9 and R12 in parallel and then connecting the resistors in series with the resistor JR 1. The direct current-to-direct current circuit provided by the embodiment of the application has a simple structure and is easy to realize.

Fig. 4 is a circuit diagram showing a specific implementation of a temperature sensing circuit in a control circuit of a multifunctional milk mixer according to a fourth embodiment of the present application. In the fourth embodiment, the temperature sensing circuit 5 includes a temperature sensor 51, an eighth resistor R20, a ninth resistor R22, and a fourth capacitor C7, where the temperature sensor 51 is configured to sense the temperature of the heated liquid, a first end of the temperature sensor 51 is respectively connected to the first end of the eighth resistor R20 and the first end of the ninth resistor R22, a second end of the eighth resistor R20 is configured to receive the second direct current voltage VDC2, a second end of the ninth resistor R22 is configured to output the temperature sensing signal NTC to the controller 4, and a first end of the fourth capacitor C7 is connected to a second end of the ninth resistor R22, and a second end of the temperature sensor 51 and a second end of the fourth capacitor C7 are respectively grounded. Specifically, in some embodiments, the temperature sensor is a thermistor. The temperature sensing circuit provided by the embodiment of the application has a simple structure and is easy to realize.

In some embodiments, the control circuit further includes a buzzer circuit, as shown in fig. 5, which is a circuit diagram of a specific implementation of the buzzer circuit in the control circuit of the multifunctional milk mixer according to the fifth embodiment of the present application. In the fifth embodiment, a buzzer circuit 6 is connected to the temperature sensing circuit 5, and is configured to sound a buzzer alarm when the temperature sensing signal NTC output by the temperature sensing circuit reaches a set value. Specifically, the buzzer circuit 6 includes a fifth capacitor C6 and a buzzer 61, where a first end of the fifth capacitor C6 is connected to the output end of the temperature sensing circuit 5 and is configured to receive the temperature sensing signal NTC, a second end of the fifth capacitor C6 is connected to a first electrode end of the buzzer 61, and a second electrode end of the buzzer 61 is configured to receive the second direct current voltage VDC2. The buzzer circuit provided by the embodiment of the application has a simple structure and is easy to realize.

In some embodiments, the sterilizing assembly in the multifunctional milk mixer further comprises a PTC heating tube disposed within the sterilizing chamber, and the control circuit further comprises a second heating control circuit for driving the PTC heating tube to generate heat. Fig. 6 is a circuit diagram showing a specific implementation of the second heating control circuit in the control circuit of the multifunctional milk mixer according to the sixth embodiment of the present application. In a sixth embodiment, the second heating control circuit 7 includes a tenth resistor R31, an eleventh resistor R32, a twelfth resistor, a third triode Q5, and a second triac SCR2, where a first end of the tenth resistor R31 is connected to the controller 4 and is configured to receive the second heating control signal PTC output by the controller, a second end of the tenth resistor R31 is connected to the base of the third triode Q5, a first end of the eleventh resistor R32 is connected to the base of the third triode Q5, a second end of the eleventh resistor Q32 and an emitter of the third triode Q5 are grounded, a collector of the third triode Q5 is connected to the first end of the twelfth resistor, a second end of the twelfth resistor is connected to the control terminal of the second triac SCR2, a first main terminal of the second triac SCR2 is connected to the first electrode PTC2 of the PTC heater, a second main terminal of the PTC heater is connected to the ac terminal of the second triac SCR2, and a second main terminal of the PTC heater is connected to the ac heater. The twelfth resistor may be formed by connecting a resistor R27 and a resistor R28 in series, that is, a first end of a series branch formed by connecting the resistor R27 and the resistor R28 in series is a first end of the twelfth resistor, and a second end of the series branch is a second end of the twelfth resistor. The second heating control circuit provided by the embodiment of the application has a simple structure and is easy to realize.

In some embodiments, the sterilization assembly of the multi-function milk mixer further comprises a fan for blowing air into the sterilization chamber, and the control circuit further comprises a fan driving circuit for driving the fan to work according to a fan control signal output by the controller. Specifically, please refer to fig. 7, which is a circuit diagram illustrating a specific implementation of a fan driving circuit in a control circuit of a multi-functional milk mixer according to a seventh embodiment of the present application. In the seventh embodiment, the FAN driving circuit 8 includes a thirteenth resistor R29, a fourteenth resistor R30, a MOS transistor Q4, a first diode D6, and a fifteenth resistor, where a first end of the thirteenth resistor R29 is connected to a FAN control output end of the controller 4 and is configured to receive the FAN control signal FAN, a second end of the thirteenth resistor R29 is connected to a controlled end of the MOS transistor Q4 and a second end of the fourteenth resistor R30, respectively, a current output end of the MOS transistor Q4 and a second end of the fourteenth resistor R30 are grounded, respectively, a current input end of the MOS transistor Q4 is connected to a first electrode end of the FAN 81 and an anode of the first diode D6, respectively, a cathode of the first diode D6 is connected to a second electrode end of the FAN 81 and a first end of the fifteenth resistor, and a second end of the fifteenth resistor is configured to receive the first direct voltage VDC1. Specifically, the fifteenth resistor may be a resistor formed by connecting resistors R37, R43 and R44 in parallel, the first end of the parallel circuit formed by connecting resistors R37, R43 and R44 in parallel is the first end of the fifteenth resistor, and the second end of the parallel circuit formed by connecting resistors R37, R43 and R44 in parallel is the second end of the fifteenth resistor. The fan driving circuit provided by the embodiment of the application has a simple structure and is easy to realize.

In some embodiments, the control circuit further includes an ultraviolet lamp power supply control circuit, a power supply end of the ultraviolet lamp control circuit is used for receiving the first direct current voltage, and the ultraviolet lamp power supply control circuit is used for controlling the first direct current voltage to supply power to the ultraviolet lamp according to an ultraviolet disinfection control signal output by the controller so as to drive the ultraviolet lamp to emit ultraviolet rays for ultraviolet disinfection. Further, the control circuit further comprises a constant current control circuit connected with the ultraviolet lamp, and the constant current control circuit is used for providing constant current driving for the ultraviolet lamp. The ultraviolet lamp is driven to emit ultraviolet rays for sterilization by adopting a constant current driving mode, so that the ultraviolet sterilization effect is improved.

In addition, in some embodiments, the present application further provides a multifunctional milk mixer, including a heating assembly, a sterilizing assembly, and a control circuit according to any of the embodiments of the present application, the heating assembly including a heat-generating tray and a liquid container disposed on the heat-generating tray for containing heated liquid, the heat-generating tray for heating the heated liquid, and the sterilizing assembly including a sterilizing chamber and an ultraviolet lamp located in the sterilizing chamber, the ultraviolet lamp for emitting ultraviolet light to ultraviolet sterilize objects placed in the sterilizing chamber.

In some embodiments, the multifunctional milk mixer provided by the embodiment of the application has at least one of a chlorine removal function, a tea making function, a health preserving function and a coffee making function in addition to a constant temperature milk mixing function and a disinfection function. Wherein, the disinfection function can be ultraviolet disinfection with drying effect. One side of the multifunctional milk mixer is a heating functional area, and the other side of the multifunctional milk mixer is a sterilizing functional area, wherein the heating functional area comprises functions of realizing constant temperature milk mixing, chlorine removal, tea making, health preserving, coffee making and the like, and the sterilizing functional area is used for realizing drying and ultraviolet sterilization. The multifunctional milk mixer is characterized in that the multifunctional milk mixer is provided with a plurality of function keys, each function key is connected with the controller 4 through a key circuit, and the controller 4 obtains current function selection information of a user according to corresponding signals output by the key circuit so as to control a heating component and a sterilizing component in the multifunctional milk mixer to perform corresponding work, so that the multifunctional milk mixer can realize functions corresponding to user selection. The heating plate in the multifunctional milk mixer is a 700W heating plate, and in addition, an indicator lamp and a digital display tube are further arranged on the multifunctional milk mixer, the indicator lamp is used for indicating the current working state of the multifunctional milk mixer, and the digital display tube is used for displaying time and temperature.

The working process and the using process of the heating area in the multifunctional milk mixer provided by the embodiment of the application are as follows:

when the multifunctional milk mixer is powered on, the buzzer sounds a sound, all lamps (the indicator lamp and the LED lamp in the digital display tube) are turned on for 1 second and then turned off, and the multifunctional milk mixer enters a standby state. If the controller 4 senses that the switch is turned on and detects that a kettle (the liquid container) is present, the current temperature on the multifunctional milk regulator displays the actual water temperature. The "set temperature" indicates "-", and the "current temperature" indicates "E1" and the "set temperature" indicates "-", when no kettle is present. 1 minute no "mode" key operation, return to enter standby state.

In the starting-up state of the multifunctional milk mixer, a mode key is sensed, boiling, dechlorination, constant temperature/milk mixing, coffee, health preserving and tea making can be selected, after the selection, the corresponding LED indicator lights flash for 3 times, the long-lighting selection function is confirmed, and the heating disc starts to work. For example: if the current mode key is pressed to select 'boiling', the boiling indicator lamp is normally on after flashing for 3 seconds, at the moment, the 'set temperature' displays the horse race lamp, after the 'current temperature' displays heating to 100 ℃, after the key indicator lamp is extinguished, the work completion buzzer sounds a 'drop' prompt, and the state of 'constant temperature/milk mixing' heat preservation is automatically shifted to. And clicking the boiling key again at any time in the working process, stopping working, extinguishing the display lamp and entering standby.

If the mode key is pressed to select ' dechlorination ', the boiling indicator lamp is normally on after flashing for 3 seconds, the ' set temperature ' is displayed on the horse race lamp, the ' current temperature ' is displayed and heated to 100 ℃, the ' set temperature ' is displayed for 5 minutes, the timer is counted down (05/04/03/02/01), the work completion buzzer sounds a prompt of ' dripping ', the temperature is automatically switched into a constant temperature/milk adjusting ' heat preservation state, the dechlorination key is clicked again at any moment in the working process, the work is stopped, the display lamp is extinguished, and the standby is started; if the mode key is pressed to select the constant temperature/milk mixing, the constant temperature/milk mixing indicator lamp is normally on after flashing for 3 seconds, the set temperature is displayed at 45 ℃, the temperature state is kept for 48 hours after the milk mixing device is heated to 45 ℃, the temperature can be adjusted by clicking the temperature + "/" temperature- "key in the working process, the temperature can be adjusted within the range of 35-95 ℃, the temperature is kept for 48 hours, the constant temperature/milk mixing key is clicked again at any moment, the work is stopped, and the display lamp is extinguished and enters standby.

If the 'coffee' is selected by pressing a mode key, the 'coffee' indicator lamp flashes for 3 seconds and is normally on, the 'set temperature' is displayed at the moment, the temperature state is kept for 2 hours after the milk regulator is heated to 85 ℃, the temperature can be regulated by clicking a 'temperature plus', 'temperature-' key in the working process, the temperature can be regulated within the range of 80 ℃ to 89 ℃, the temperature is kept for 2 hours, the heat regulating key is clicked again at any time, the work is stopped, the 'health preserving' is selected by pressing the mode key, the 'health preserving' indicator lamp flashes for 3 seconds and is normally on, the 'set temperature' is displayed at 90 ℃, the milk regulator is kept in the temperature state for 2 hours after being heated to 90 ℃, the temperature can be regulated by clicking a 'temperature plus', 'temperature-' key in the working process, the temperature can be regulated within the range of 90 ℃ to 95 ℃, the heat is kept for 2 hours, the heat regulating key is clicked again at any time, the work is stopped, and the display lamp is extinguished to enter standby; if the mode key is pressed to select 'tea making', 'tea making' indicator lamp to flash for 3 seconds and then always light, the 'set temperature' is displayed at 95 ℃, the temperature state is kept for 2 hours after the milk regulator is heated to 95 ℃, the temperature can be regulated in the working process by clicking the 'temperature+'/'temperature-' key, the temperature can be regulated in the range of 90 ℃ to 95 ℃, the temperature is kept for 2 hours, the heat regulating key is clicked again at any time, the work is stopped, and the display lamp is extinguished and enters standby.

It should be noted that, when the multifunctional milk mixer provided by the embodiment of the application is applied to a plateau region, in the boiling or dechlorination working process, when the temperature is detected to exceed 86 ℃ but not reach 100 ℃ and the temperature is not increased constantly for 90 seconds, the temperature is determined to be in the plateau region, and the display temperature is increased by 1 ℃ per second to 100 ℃. And in the boiling mode, the heating plate is controlled to work at full power (700W) to generate heat, when the water temperature is heated to 93 ℃, the heating power of the heating plate is controlled to 612W, and when the water temperature is continuously heated to 95 ℃, the heating power of the heating plate is controlled to 438W. Further, during the chlorine removal mode, the heating power of the heat generating dial was controlled to 350W at the time of counting down 5 minutes.

In some embodiments, the multifunctional milk mixer further includes an illumination lamp in addition to the ultraviolet lamp, and the ultraviolet lamp and the illumination lamp are switched, and specifically, the working process and the using process of the sterilization area in the multifunctional milk mixer according to the embodiment of the application are as follows:

the multifunctional milk mixer is powered on, the buzzer sounds a sound of 'beep', and all lamps are turned on for 1 second and then turned off. When the controller senses that the disinfection switch is turned on, the nixie tube displays "- -" and no operation is performed for 1 minute, and the multifunctional milk mixer enters a standby state.

When the multifunctional milk mixer is in a starting state, if the controller 4 senses an automatic key, an automatic key indicator lights, after the indicator lights flash for 3 times, the automatic oven-drying function (PTC heating tube works and a fan works), the nixie tube displays 30 to start counting down, other functions are converted with midway after counting down is completed, and the fan is delayed for 30 seconds. After the time is up, the ultraviolet lamp is on, and disinfection is started. The nixie tube displays '20' to start counting down, and the function is closed after the time is up.

When the multifunctional milk mixer is in a starting state, if the controller 4 senses a disinfection key, a disinfection key indicator lamp flashes, after the indicator lamp flashes for 3 times, an ultraviolet lamp is lighted after the indicator lamp flashes, a nixie tube displays 20 to start disinfection, the working time is 20min, and the working time can be selected from 20min to 25min by pressing the disinfection key for a short time.

When the multifunctional milk mixer is in a starting state, if the controller 4 senses a drying key, a drying key indicator lamp flashes, after the indicator lamp flashes for 3 times, a nixie tube displays that a 30 PTC heating tube and a fan work simultaneously, and countdown begins. The "dry" key is pressed briefly and the duty cycle can be selected. After the countdown is completed, other functions are switched with midway, and the fan is delayed for 30 seconds.

When the multifunctional milk mixer is in a starting state, if the controller 4 senses a storage button, the storage indicator is controlled to flash, the indicator is dried for 5min and sterilized for 5min after the indicator is flash for 3 times, and the multifunctional milk mixer works circularly every 3 hours. The storage time is 24 hours.

In addition, in the multifunctional milk mixer provided by the embodiment of the application, if the multifunctional milk mixer is used for sterilizing, if the sterilizing door of the sterilizing chamber is detected to be opened, the ultraviolet lamp is controlled to be turned off, and if the sterilizing door is not detected to be closed after 2 minutes, the lamp is controlled to be automatically turned off. If the disinfection door is detected to be closed, the ultraviolet lamp is controlled to be turned on, and the illuminating lamp is turned off. In addition, at any moment when the multifunctional milk mixer works, if the disinfection door is detected to be opened, the illumination lamp is controlled to be lightened.

The rated nominal power of the multifunctional milk regulator provided by the embodiment of the application is 220V/50Hz, the multifunctional milk regulator has an instantaneous power-off protection function, does not have the phenomena of ignition and electric leakage, can withstand voltage changes within the range of 176V to 250V, and can withstand temperature changes within the range of-10 ℃ to 80 ℃. As shown in fig. 1, in the control circuit of the multifunctional milk regulator, a common wiring of a power supply introduced to a silicon controlled rectifier can withstand a current of 10A, a wiring of the silicon controlled rectifier to a control end can withstand a current of 8A, and the control circuit can withstand the impact of power grid surge and the interference of power grid noise.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily appreciate variations or alternatives within the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims

1. The control circuit of the multifunctional milk mixer is characterized by comprising a heating assembly and a sterilizing assembly, wherein the heating assembly comprises a heating disc and a liquid container which is arranged on the heating disc and is used for containing heated liquid, the heating disc is used for heating the heated liquid, the sterilizing assembly comprises a sterilizing chamber and an ultraviolet lamp which is positioned in the sterilizing chamber, the ultraviolet lamp is used for emitting ultraviolet rays so as to sterilize objects to be sterilized which are placed in the sterilizing chamber, and the control circuit comprises a zero-crossing detection circuit, a temperature sensing circuit, a controller, a first heating control circuit and a power supply circuit;

The power supply circuit comprises an alternating current-to-direct current circuit and a direct current-to-direct current circuit connected with a direct current voltage output end of the alternating current-to-direct current circuit, a first input end of the alternating current-to-direct current circuit is connected with an alternating current zero line end, a second input end of the alternating current-to-direct current circuit is connected with an alternating current live line end, the alternating current-to-direct current circuit is used for converting alternating current voltage output by an alternating current power supply into a first direct current voltage, the first direct current voltage is used for supplying power to the ultraviolet lamp, the direct current-to-direct current circuit is used for converting the first direct current voltage into a second direct current voltage, and the second direct current voltage is used for supplying power to the zero-crossing detection circuit and the temperature sensing circuit respectively.

2. The control circuit of claim 1, wherein the ac to dc circuit comprises a momentary interruption protection circuit connected to the ac live terminal, a grid surge protection circuit connected between the ac live terminal and the ac live terminal, and a flyback isolated ac to dc switching power supply circuit connected to an output of the grid surge protection circuit.

3. The control circuit of claim 1, wherein the dc-dc circuit comprises a seventh resistor, a three-terminal voltage regulator chip, a second capacitor, and a third capacitor, a first end of the seventh resistor is connected to the dc voltage output end of the ac-dc circuit, a second end of the seventh resistor is connected to the input end of the three-terminal voltage regulator chip, the output end of the three-terminal voltage regulator chip outputs the second dc voltage, the ground terminal of the three-terminal voltage regulator chip is grounded, a first end of the second capacitor and a first end of the third capacitor are respectively connected to the output end of the three-terminal voltage regulator chip, and a second end of the second capacitor and a second end of the third capacitor are respectively grounded.

4. The control circuit of claim 1, wherein the temperature sensing circuit comprises a temperature sensor for sensing the temperature of the heated liquid, an eighth resistor, a ninth resistor, and a fourth capacitor, a first end of the temperature sensor being connected to the first end of the eighth resistor and the first end of the ninth resistor, respectively, a second end of the eighth resistor being configured to receive the second dc voltage, a second end of the ninth resistor being configured to output the temperature sensing signal to the controller, a first end of the fourth capacitor being connected to the second end of the ninth resistor, a second end of the temperature sensor being connected to ground, respectively.

5. The control circuit of claim 1, further comprising a buzzer circuit connected to the temperature sensing circuit;

6. The control circuit of claim 1, wherein the sterilization assembly further comprises a PTC heating tube disposed in the sterilization chamber, the control circuit further comprises a second heating control circuit for driving the PTC heating tube to generate heat, wherein the second heating control circuit comprises a tenth resistor, an eleventh resistor, a twelfth resistor, a third triode and a second triac, a first end of the tenth resistor is connected to the controller for receiving a second heating control signal output from the controller, a second end of the tenth resistor is connected to a base of the third triode, a first end of the eleventh resistor is connected to a base of the third triode, a second end of the eleventh resistor and an emitter of the third triode are respectively grounded, a collector of the third triode is connected to a first end of the twelfth resistor, a second end of the twelfth resistor is connected to a control terminal of the second triac, a first end of the second triac is connected to a first terminal of the PTC heating tube, and a first end of the PTC heating tube is connected to a first terminal of the PTC heating tube, and a second terminal of the PTC heating tube is connected to the PTC heating tube.

7. The control circuit of claim 6, wherein the sterilization assembly further comprises a fan for blowing air into the sterilization chamber, the control circuit further comprising a fan driving circuit for driving the fan to operate according to a fan control signal output from the controller;

8. The control circuit of claim 1, further comprising an ultraviolet lamp power supply control circuit, wherein a power supply end of the ultraviolet lamp control circuit is used for receiving the first direct current voltage, and the ultraviolet lamp power supply control circuit is used for controlling the first direct current voltage to supply power to the ultraviolet lamp according to an ultraviolet disinfection control signal output by the controller so as to drive the ultraviolet lamp to emit ultraviolet rays for ultraviolet disinfection.

9. The control circuit of claim 8, further comprising a constant current control circuit coupled to the ultraviolet lamp, the constant current control circuit configured to provide constant current drive to the ultraviolet lamp.

10. A multifunctional milk mixer, comprising a heating assembly, a sterilizing assembly and a control circuit according to any one of claims 1 to 9, wherein the heating assembly comprises a heating plate and a liquid container arranged on the heating plate and used for containing heated liquid, the heating plate is used for heating the heated liquid, the sterilizing assembly comprises a sterilizing chamber and an ultraviolet lamp positioned in the sterilizing chamber, and the ultraviolet lamp is used for emitting ultraviolet rays so as to sterilize objects placed in the sterilizing chamber.