Circuit capable of identifying cup body and temperature control protection state for stirrer

Abstract

The utility model relates to the field of blenders, in particular to a circuit capable of identifying a cup body and a temperature control protection state for a blender, which comprises a blender motor, a microswitch, a control module, a silicon controlled rectifier control circuit, a PTC (Positive Temperature Coefficient) thermistor, a PTC detection circuit and a power supply circuit, the microswitch and the PTC thermistor are connected in series between the stirrer motor and the power circuit, a detection port of the PTC detection circuit is connected between the stirrer motor and the PTC thermistor, the microswitch is used for being disconnected when the cup body is installed abnormally, and the silicon controlled rectifier control circuit is connected in series between the stirrer motor and the power circuit. The input end of the control module is connected with the output end of the PTC detection circuit, and the output end of the control module is connected with the control end of the silicon controlled rectifier control circuit. When the cup body is not installed correctly or the circuit of the motor is overheated, the cup can be timely dealt with.

Description

Technical Field

[0001] This application relates to the field of blenders, and more particularly to a circuit for a blender that identifies the cup body and temperature control protection status. Background Technology

[0002] A food blender is a small appliance consisting of a cup and a base. The cup contains built-in blending blades and a drive shaft, while the base integrates a motor and control circuitry. When in use, turning on the switch activates the motor, which drives the blades to rotate at high speed, quickly blending and juicing fruits and vegetables.

[0003] The CN209610907U household vegetable puree blender consists of a body, motor, transmission device, and safety control structure. A push-torque mechanism runs through the body and connects to the PCB circuit board, controlling the motor's start and stop. The transmission device has a built-in microswitch; when the top cover is opened, the raised rib disengages from the push block, and the resistance spring triggers the microswitch to cut off the power, achieving a power-off function when the cover is opened, thus improving operational safety.

[0004] Regarding the aforementioned technologies, the circuitry of the blender can only detect whether the blender's lid is open, but it cannot detect whether the container is correctly installed or the operating temperature of the motor circuit. If the container is not installed correctly or the motor circuit overheats and is not detected in time, it may lead to equipment damage or even a safety accident. Utility Model Content

[0005] In order to respond promptly when the cup is not installed correctly or the motor circuit overheats, this application provides a circuit for a blender that can identify the cup and the temperature control protection status.

[0006] This application provides a circuit for a blender that can identify the cup body and temperature control protection status, employing the following technical solution:

[0007] A circuit for identifying the cup body and temperature control protection status of a blender includes a blender motor, a micro switch, a control module, a SCR control circuit, a PTC thermistor, a PTC detection circuit, and a power supply circuit. The micro switch and the PTC thermistor are connected in series between the blender motor and the power supply circuit. The detection port of the PTC detection circuit is connected between the blender motor and the PTC thermistor. The micro switch is used to disconnect when the cup body is improperly installed. The SCR control circuit is connected in series between the blender motor and the power supply circuit. The input terminal of the control module is connected to the output terminal of the PTC detection circuit, and the output terminal of the control module is connected to the control terminal of the SCR control circuit.

[0008] By adopting the above technical solution, this circuit realizes the identification of the mixer cup installation status and the temperature control protection function of the motor circuit. When the cup installation is abnormal, the microswitch is disconnected, cutting off the connection between the mixer motor and the power circuit, preventing the motor from operating under unsafe conditions and effectively ensuring user safety. Simultaneously, the PTC detection circuit monitors the state of the PTC thermistor in real time and sends the detection signal to the control module. Since the resistance of the PTC thermistor changes with temperature, when the operating temperature of the motor circuit exceeds the set value, the resistance of the PTC thermistor will change accordingly. The PTC detection circuit converts this change into a detection signal and transmits it to the control module. Upon receiving the signal, the control module controls the thyristor control circuit to disconnect the connection between the mixer motor and the power circuit, thereby preventing the motor from being damaged due to overheating, extending the motor's service life, and improving the overall reliability and stability of the mixer.

[0009] Preferably, the power supply circuit includes a live wire terminal and a neutral wire terminal. One end of the micro switch is connected to the neutral wire terminal, and the other end of the micro switch is connected to one end of the PTC thermistor. The other end of the PTC thermistor is connected to the negative power supply terminal of the mixer motor, and the positive power supply terminal of the mixer motor is connected to the live wire terminal.

[0010] By adopting the above technical solution, this connection method ensures that during normal operation, current flows from the live wire to the positive power supply terminal of the mixer motor, passes through the motor, and then returns to the neutral wire via the PTC thermistor and microswitch, forming a complete current loop. When the cup body is improperly installed, the microswitch disconnects, cutting off the neutral wire connection between the motor and the power supply, thus preventing the motor from operating under unsafe conditions and ensuring safe use.

[0011] Preferably, the thyristor control circuit includes a thyristor and a first switch. The T1 terminal of the thyristor is connected to the live wire terminal, the T2 terminal of the thyristor is connected to the live wire input terminal of the mixer motor, the T1 terminal of the thyristor is connected to the input terminal of the first switch, the control terminal of the first switch is connected to the control module, and the output terminal of the first switch is grounded.

[0012] By adopting the above technical solution, the control module can control the conduction and cutoff of the thyristor by controlling the on / off state of the first switch. When the control module detects that the operating temperature of the motor circuit exceeds the set value, it controls the first switch to open, causing the trigger signal of the thyristor to disappear, and the thyristor to cut off, thereby disconnecting the mixer motor from the live wire and achieving overheat protection for the motor. This control method has a fast response speed and can protect the motor in a timely and effective manner.

[0013] Preferably, it further includes an absorption circuit, which includes a first capacitor and a first resistor connected in series. The absorption circuit is connected in parallel with the thyristor. The end of the first capacitor away from the first resistor is connected to the T1 terminal of the thyristor, and the other end of the first resistor is connected to the T2 terminal of the thyristor.

[0014] By adopting the above technical solution, the absorption circuit is connected in parallel with the thyristor. At the instant when the thyristor is turned on and off, the absorption circuit composed of the first capacitor and the first resistor can absorb the surge voltage and peak current generated in the circuit, prevent these abnormal voltages and currents from damaging the thyristor, improve the reliability and service life of the thyristor, and at the same time reduce the interference to the entire circuit.

[0015] Preferably, it further includes a second capacitor, one end of which is connected to the live wire, and the other end of which is connected to the input terminal of the first switch. The G terminal of the thyristor is connected between the second capacitor and the input terminal of the first switch.

[0016] By adopting the above technical solution, the second capacitor plays a role in stabilizing voltage and filtering in the circuit. During circuit operation, the voltage at the live wire end may fluctuate and be subject to interference. The second capacitor, connected to the input terminal of the first switch, can smooth the voltage input to the first switch, making the trigger signal of the thyristor more stable. Simultaneously, the G terminal of the thyristor is connected between the second capacitor and the input terminal of the first switch. This connection method ensures that the thyristor can accurately and reliably turn on and off when receiving a stable trigger signal, avoiding thyristor malfunction due to voltage fluctuations. This further improves the stability and reliability of the entire circuit, ensuring the mixer motor operates in a safe and stable circuit environment.

[0017] Preferably, the PTC detection circuit includes a second switching element, the control terminal of which is connected between the mixer motor and the PTC thermistor, and the input terminal of which is connected to the control module. The power supply circuit also includes a switching power supply, the +5V output terminal of which is connected to the input terminal of the second switching element, the output terminal of which is grounded, and the input pin of the control module is connected between the +5V output terminal of the switching power supply and the input terminal of the second switching element.

[0018] By adopting the above technical solution, the control terminal of the second switch is connected between the mixer motor and the PTC thermistor, enabling real-time detection of voltage changes across the PTC thermistor, thus reflecting the temperature of the motor circuit. When the temperature changes, the resistance of the PTC thermistor changes, and the voltage across it changes accordingly. The second switch determines its on / off state based on this changing voltage signal. When the second switch is closed, the control module determines, based on the received signal, that the temperature of the motor circuit exceeds the set value, and then controls the switching on / off state of the thyristor control circuit to achieve temperature control protection for the motor. The +5V output of the switching power supply provides a stable operating power supply for the second switch, ensuring the normal operation of the detection circuit.

[0019] Preferably, it also includes a first diode, the cathode of the first diode being connected to the control terminal of the second switching device, and the other end of the first diode being connected between the mixer motor and the PTC thermistor.

[0020] By employing the above technical solution, the first diode serves as an isolation and protection mechanism. It prevents damage to the second switching element under certain abnormal conditions, such as reverse voltage or current surges. When a reverse voltage occurs, the first diode cuts off, preventing reverse current from flowing into the second switching element, thus ensuring the stability and reliability of the PTC detection circuit.

[0021] Preferably, a third capacitor is connected between the input and output terminals of the second switch.

[0022] By adopting the above technical solution, the third capacitor can filter and store energy for the input signal of the second switching device. It can smooth input signal fluctuations, provide a stable operating voltage, and simultaneously provide instantaneous energy support to the second switching device during the switching process, reducing interference and noise during switching, improving the operational stability and reliability of the second switching device, and thus ensuring the normal operation of the thyristor control circuit.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. This circuit identifies the installation status of the blender cup and provides temperature control protection for the motor circuit. When the cup is improperly installed, the microswitch disconnects, cutting off the connection between the blender motor and the power supply circuit, preventing the motor from operating under unsafe conditions and effectively ensuring user safety. Simultaneously, the PTC detection circuit monitors the state of the PTC thermistor in real time and sends the detection signal to the control module. Since the resistance of the PTC thermistor changes with temperature, when the motor circuit operating temperature exceeds the set value, the resistance of the PTC thermistor will change accordingly. The PTC detection circuit converts this change into a detection signal and transmits it to the control module. Upon receiving the signal, the control module controls the SCR control circuit to disconnect the blender motor from the power supply circuit, thereby preventing the motor from being damaged due to overheating, extending the motor's lifespan, and improving the overall reliability and stability of the blender.

[0025] 2. The control module can control the conduction and cutoff of the thyristor by controlling the on / off state of the first switch. When the control module detects that the operating temperature of the motor circuit exceeds the set value, it controls the first switch to open, causing the trigger signal of the thyristor to disappear, and the thyristor to cut off, thereby disconnecting the mixer motor from the live wire and achieving overheat protection for the motor. This control method has a fast response speed and can protect the motor in a timely and effective manner.

[0026] 3. The absorption circuit is connected in parallel with the thyristor. At the instant when the thyristor is turned on and off, the absorption circuit composed of the first capacitor and the first resistor can absorb the surge voltage and peak current generated in the circuit, preventing these abnormal voltages and currents from damaging the thyristor, improving the reliability and service life of the thyristor, and also reducing interference to the entire circuit. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall circuit of the circuit that can identify the cup body and the temperature control protection status according to an embodiment of this application.

[0028] Figure 2 This is a circuit diagram of a switching power supply.

[0029] Figure 3 This is a circuit diagram of a PTC detection circuit.

[0030] Figure 4 This is a circuit diagram of a thyristor control circuit.

[0031] Explanation of reference numerals in the attached diagram: 1. Mixer motor; 2. Microswitch; 3. Control module; 4. SCR control circuit; 5. PTC thermistor; 6. PTC detection circuit; 7. Power supply circuit; 71. Switching power supply. Detailed Implementation

[0032] The present application will be further described in detail below with reference to all the accompanying drawings.

[0033] This application discloses a circuit for a blender that can identify the cup body and temperature control protection status. (Refer to...) Figure 1 , Figure 2 A circuit for identifying the cup body and temperature control protection status of a blender includes a blender motor 1, a micro switch 2, a control module 3, a silicon controlled rectifier (SCR) control circuit 4, a PTC thermistor 5, a PTC detection circuit 6, and a power supply circuit 7.

[0034] The power supply circuit 7 includes a live wire terminal, a neutral wire terminal, and a switching power supply 71. The switching power supply 71 converts 220V voltage to +5V voltage. The control module 3 uses a microcontroller, and the switching power supply 71 supplies power to the microcontroller. The live wire input terminal and the neutral wire input terminal of the stirring motor are connected to the live wire terminal and the neutral wire terminal respectively. The micro switch 2 and the PTC thermistor 5 are connected in series between the stirring motor 1 and the power supply circuit 7.

[0035] The blender used in this circuit has a cup body and a base. A main power switch is installed on the base to control the start and stop of the blender motor 1. This main power switch is connected in series between the live wire terminal of the power circuit 7 and the live wire input terminal of the blender motor. When the cup body is screwed tightly onto the base, it actuates a transmission block on the base, thus activating a microswitch. When the power switch is turned on, the blender motor 1 enters the working state. If the cup body is not fixed in the preset position, the microswitch is in the off state. In this case, even if the power switch is turned on, the blender motor 1 will not work, ensuring the safety and reliability of the blender.

[0036] Reference Figure 1 , Figure 3The PTC detection circuit 6 includes a second switch Q2, a first diode D1, an eleventh resistor R11, a second resistor R2, a third resistor R3, a fourth resistor R4, a sixth resistor R6, a third capacitor C3, and a fourth capacitor C4. The second switch is an NPN transistor. The eleventh resistor R11, the first diode, and the fourth resistor are connected in series between one end of the PTC thermistor 5 and the control terminal of the second switch. The control terminal of the second switch is connected between the mixer motor 1 and the PTC thermistor 5. The two ends of the sixth resistor are connected to the control terminal and the output terminal of the second switch, respectively. The two ends of the third capacitor are connected to the control terminal and the output terminal of the second switch, respectively. The input terminal of the second switch is connected to the +5V of the switching power supply 71 through the second resistor. In addition, the input terminal of the second switch is connected to one end of the third resistor, and the other end of the third resistor is connected to the PTC input interface of the control module 3. The output terminal of the second switch is grounded. The PTC input pin of the control module 3 is connected between the input terminal of the second switch and the second resistor through the third resistor. One end of the fourth capacitor is connected between the third resistor and the control module 3, and the other end of the fourth capacitor is grounded.

[0037] Reference Figure 1 , Figure 4 The thyristor control circuit 4 includes an absorption circuit, a thyristor SCR, a first switch Q1, a second capacitor C2, resistors R14, R16, R19, and R20. The first switch is an NPN transistor. The absorption circuit includes a first capacitor C1 and a first resistor R1 connected in series. The first capacitor C1 and the first resistor R1 are connected in parallel between the T1 and T2 terminals of the thyristor. The T1 terminal of the thyristor is connected to the live wire terminal, and the T2 terminal of the thyristor is connected to the live wire input terminal of the mixer motor 1. One end of the second capacitor is connected to the live wire terminal, and the other end of the second capacitor is connected to the input terminal of the first switch through resistor R16. The output terminal of the first switch is grounded. The control terminal of the first switch is connected to the MOT output pin of the control module 3 through resistor R19. Resistor R20 is connected in parallel between the control terminal and the output terminal of the first switch. One end of resistor R14 is connected to the G terminal of the thyristor, and the other end of resistor R14 is connected between the second capacitor and the input terminal of the first switch.

[0038] The implementation principle of a circuit for identifying the cup installation status and temperature control protection of a mixer according to an embodiment of this application is as follows: This circuit realizes the identification of the installation status of the mixer cup and the temperature control protection function of the motor circuit. When the cup installation is abnormal, the micro switch 2 is disconnected, cutting off the connection between the mixer motor 1 and the power supply circuit 7, preventing the motor from operating under unsafe conditions and effectively ensuring user safety. At the same time, the PTC detection circuit detects the status of the PTC thermistor in real time and sends the detection signal to the control module 3. Since the resistance of the PTC thermistor changes with temperature, when the operating temperature of the motor circuit exceeds the set value, the resistance of the PTC thermistor will change accordingly. The PTC detection circuit converts this change into a detection signal and transmits it to the control module 3. After receiving the signal, the control module 3 controls the thyristor control circuit 4 to disconnect the connection between the mixer motor 1 and the power supply circuit 7, thereby preventing the motor from being damaged due to overheating, extending the service life of the motor, and improving the overall reliability and stability of the mixer.

[0039] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A circuit for a blender that can identify the container and temperature control protection status, characterized in that: The system includes a mixer motor (1), a micro switch (2), a control module (3), a thyristor control circuit (4), a PTC thermistor (5), a PTC detection circuit (6), and a power supply circuit (7). The micro switch (2) and the PTC thermistor (5) are connected in series between the mixer motor (1) and the power supply circuit (7). The detection port of the PTC detection circuit (6) is connected between the mixer motor (1) and the PTC thermistor (5). The micro switch (2) is used to disconnect when the cup body is installed abnormally. The thyristor control circuit (4) is connected in series between the mixer motor (1) and the power supply circuit (7). The input terminal of the control module (3) is connected to the output terminal of the PTC detection circuit (6), and the output terminal of the control module (3) is connected to the control terminal of the thyristor control circuit (4).

2. The circuit for a mixer that can identify the cup body and temperature control protection status according to claim 1, characterized in that: The power supply circuit (7) includes a live wire terminal and a neutral wire terminal. One end of the micro switch (2) is connected to the neutral wire terminal, and the other end of the micro switch (2) is connected to one end of the PTC thermistor (5). The other end of the PTC thermistor (5) is connected to the negative power supply terminal of the mixer motor (1), and the positive power supply terminal of the mixer motor (1) is connected to the live wire terminal.

3. The circuit for identifying the cup body and temperature control protection status of a blender according to claim 2, characterized in that: The thyristor control circuit (4) includes a thyristor and a first switch. The T1 terminal of the thyristor is connected to the live wire terminal, the T2 terminal of the thyristor is connected to the live wire input terminal of the mixer motor (1), the T1 terminal of the thyristor is connected to the input terminal of the first switch, the control terminal of the first switch is connected to the control module (3), and the output terminal of the first switch is grounded.

4. The circuit for identifying the cup body and temperature control protection status of a mixer according to claim 3, characterized in that: It also includes an absorption circuit, which includes a first capacitor and a first resistor connected in series. The absorption circuit is connected in parallel with the thyristor. The end of the first capacitor away from the first resistor is connected to the T1 terminal of the thyristor, and the other end of the first resistor is connected to the T2 terminal of the thyristor.

5. A circuit for a mixer that can identify the cup body and temperature control protection status according to claim 3, characterized in that: It also includes a second capacitor, one end of which is connected to the live wire, and the other end of which is connected to the input terminal of the first switch. The G terminal of the thyristor is connected between the second capacitor and the input terminal of the first switch.

6. The circuit for identifying the cup body and temperature control protection status of a blender according to claim 1, characterized in that: The PTC detection circuit (6) includes a second switch, the control terminal of which is connected between the mixer motor (1) and the PTC thermistor (5), and the input terminal of which is connected to the control module (3). The power supply circuit (7) also includes a switching power supply (71), the +5V output terminal of which is connected to the input terminal of the second switch, and the output terminal of which is grounded. The input pin of the control module (3) is connected between the +5V output terminal of the switching power supply (71) and the input terminal of the second switch.

7. A circuit for a mixer that can identify the cup body and temperature control protection status according to claim 6, characterized in that: It also includes a first diode, the cathode of which is connected to the control terminal of the second switch, and the other end of the first diode is connected between the mixer motor (1) and the PTC thermistor (5).

8. A circuit for a mixer that can identify the cup body and temperature control protection status according to claim 6, characterized in that: A third capacitor is connected between the input and output terminals of the second switching device.

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