An oven heating temperature control circuit

Abstract

The application discloses an oven heating temperature control circuit, comprising a Bluetooth module, a main control module, a driving module and a heating module, wherein the Bluetooth module is used for receiving an internal food temperature signal of a Bluetooth probe; the main control module is used for comparing the internal food temperature signal with a preset heating temperature when the internal food temperature signal is received, and outputting a stop heating signal if the preset heating temperature is exceeded; the driving module is used for outputting a stop heating driving signal when the stop heating signal is received; and the heating module is used for stopping heating food when the stop heating driving signal is received. The application can collect the internal heating temperature of food in real time by inserting a Bluetooth probe into the food, the main control module can monitor the internal heating temperature of food in real time through the Bluetooth module, and the heating of food can be stopped when the internal heating temperature of food exceeds the preset heating temperature, so that the over-baking of food and the resulting burnt taste can be avoided.

Description

[Technical Field] This utility model relates to the field of smart home appliance technology, and in particular to an oven heating temperature control circuit. [Background Technology] Air fryers, as a type of healthy cooking appliance, use a built-in heating element and a high-speed fan to form a hot air circulation system. This system uses hot air to quickly heat food, creating a crispy surface while reducing oil intake, and has gradually become a common appliance in modern kitchens.

[0001] The temperature sensors in most existing air fryer ovens are located on the inner wall of the oven cavity. They can only detect the ambient temperature of the cavity and cannot directly obtain the actual internal temperature of the food. Due to the significant heat conduction lag between the oven cavity temperature and the internal temperature of the food, the temperature control accuracy is insufficient. This can easily lead to problems such as the food surface being burnt while the inside is undercooked, or over-baking resulting in a dry texture. The success rate of cooking is highly dependent on user experience, making it difficult to guarantee the consistency of baking quality. [Utility Model Content] To solve the above-mentioned technical problems, this utility model proposes an oven heating temperature control circuit.

[0002] To achieve the above objectives, this utility model is implemented by the following technical solution: An oven heating temperature control circuit includes: A Bluetooth module, wherein the wireless signal receiver of the Bluetooth module is used to receive the internal temperature signal of the food from the Bluetooth probe; The main control module has its control signal input terminal connected to the wireless signal transmitter of the Bluetooth module. When the main control module receives the internal temperature signal of the food, it compares it with the preset heating temperature. If the temperature exceeds the preset heating temperature, it outputs a stop heating signal. A drive module, the input terminal of which is connected to the control signal output terminal of the main control module, is used to output a stop heating drive signal when the stop heating signal is received; A heating module, the input of which is connected to the output of the drive module, is used to stop heating food when it receives the stop heating drive signal.

[0003] By adopting the above technical solution, the oven uses a Bluetooth probe inserted into the food to collect the internal heating temperature in real time during the baking process. The main control module monitors the internal heating temperature of the food in real time through the Bluetooth module, and stops heating the food when the internal heating temperature exceeds the preset heating temperature to avoid over-baking and burning. Secondly, compared with the traditional oven's monitoring method of inferring the doneness of food by the temperature of the baking cavity, it can significantly improve the control accuracy of the baking temperature, ensure that the food is baked to the ideal doneness, avoid the outside being burnt and the inside being raw or overcooked and dry, and effectively improve the baking success rate and the taste of the food.

[0004] The oven heating temperature control circuit described above further includes: A power module, the input terminal of which is connected to an AC power source, is used to provide a stable operating voltage.

[0005] As described above, in an oven heating temperature control circuit, the power supply module includes: A rectifier unit, the input terminal of which is connected to the mains power supply, is used to rectify the mains power supply into a 24V DC voltage; The first step-down unit has its input terminal connected to the output terminal of the rectifier unit. The first step-down unit is used to step down the 24V DC voltage to a 5V DC voltage. The second step-down unit has its input terminal connected to the output terminal of the first step-down unit. The second step-down unit is used to step down the 5V DC voltage to a 3.3V DC voltage.

[0006] As described above, in an oven heating temperature control circuit, the Bluetooth module includes: The Bluetooth chip has a wireless signal receiver for receiving the internal temperature signal of the food from the Bluetooth probe, and its wireless signal transmitter is connected to the control signal input of the main control module. The crystal oscillator unit has its input terminal connected to the crystal oscillator input terminal of the Bluetooth chip and its output terminal connected to the crystal oscillator output terminal of the Bluetooth chip. The crystal oscillator unit is used to provide a reference clock source.

[0007] As described above, in an oven heating temperature control circuit, the crystal oscillator unit includes a crystal oscillator Y2, a capacitor C11, and a capacitor C12. The input terminal of the crystal oscillator Y2 is connected to the crystal oscillator input terminal of the Bluetooth chip, and the output terminal of the crystal oscillator Y2 is connected to the crystal oscillator output terminal of the Bluetooth chip. The capacitor C11 is connected between the input terminal of the crystal oscillator Y2 and ground, and the capacitor C12 is connected between the output terminal of the crystal oscillator Y2 and ground.

[0008] As described above, in an oven heating temperature control circuit, the heating module includes: A top heating unit, the heating end of which is connected to the top heating output end of the drive module, is used to control the top heating element of the oven to heat up or stop heating; The bottom heating unit is connected to the bottom heating output terminal of the drive module. The bottom heating unit is used to control the bottom heating element of the oven to heat up or stop heating.

[0009] As described above, in an oven heating temperature control circuit, the top heating element unit includes a relay K1, a transistor Q3, a diode D1, and a resistor R10. The top heating output terminal of the drive module is connected to one end of the resistor R10, and the other end of the resistor R10 is connected to the base of the transistor Q3. The emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 is connected to the first coil terminal of the relay K1. The collector of the transistor Q3 is also connected to the positive terminal of the diode D1, and the negative terminal of the diode D1 is connected to the second coil terminal of the relay K1. The output terminal of the rectifier unit is connected to the second coil terminal of the relay K1. The normally open terminal of the relay K1 is connected to the live wire of the mains power supply, and the common terminal of the relay K1 is connected to the control terminal of the top heating element.

[0010] As described above, in an oven heating temperature control circuit, the bottom heating unit includes a relay K2, a transistor Q4, a diode D2, and a resistor R11. The bottom heating output terminal of the drive module is connected to one end of the resistor R11, and the other end of the resistor R11 is connected to the base of the transistor Q4. The emitter of the transistor Q4 is grounded, and the collector of the transistor Q4 is connected to the first coil terminal of the relay K2. The collector of the transistor Q4 is also connected to the positive terminal of the diode D2, and the negative terminal of the diode D2 is connected to the second coil terminal of the relay K2. The output terminal of the rectifier unit is connected to the second coil terminal of the relay K2. The normally open terminal of the relay K2 is connected to the live wire of the mains power supply, and the common terminal of the relay K2 is connected to the control terminal of the bottom heating element.

[0011] The oven heating temperature control circuit described above further includes: A lighting module, wherein the lighting input terminal of the lighting module is connected to the lighting output terminal of the drive module, and the lighting module is used to control the lighting inside the oven to be turned on; A fan module, wherein the fan input terminal of the fan module is connected to the fan output terminal of the drive module, and the fan module is used to drive the fan of the oven to rotate.

[0012] The oven heating temperature control circuit described above further includes: The display module has a display signal terminal connected to the display signal terminal of the main control module, and the display module is used to display oven operating information.

[0013] Compared with the prior art, the oven heating temperature control circuit proposed in this utility model has the following beneficial effects: 1. The oven heating temperature control circuit proposed in this utility model can collect the internal heating temperature of food in real time by inserting a Bluetooth probe into the food. The main control module monitors the internal heating temperature of food in real time through the Bluetooth module, and stops heating the food when the internal heating temperature of the food exceeds the preset heating temperature to avoid over-baking and burning. Secondly, compared with the traditional oven's monitoring method of inferring the doneness of food by the temperature of the baking cavity, it can significantly improve the control accuracy of baking temperature, ensure that the food reaches the ideal doneness when baking, avoid the outside being burnt and the inside being raw or overcooked and dry, and effectively improve the baking success rate and the taste of the food.

[0014] 2. The Bluetooth module proposed in this utility model allows users to view the heating temperature of food in real time through a mobile APP, so that users can observe the baking status of food without frequently opening the oven. At the same time, users can also remotely adjust the baking temperature, baking time and baking mode of the oven through the Bluetooth module, improving the user experience.

[0015] 3. The heating module proposed in this utility model includes a top heating unit and a bottom heating unit, which can independently control the top heating tube and the bottom heating tube inside the baking cavity. This allows for adjustment of the upper and lower surface heating temperatures of the food according to its characteristics, ensuring that the food reaches the ideal level of doneness. Compared with traditional ovens that simultaneously control the bottom and top heating tubes, this avoids the phenomenon of food being burnt on top and raw on the bottom, or vice versa, where the top temperature of the baking cavity is too high and the bottom temperature is too low or the bottom temperature is too high. [Attached Image Description] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0016] Figure 1 This is a block diagram illustrating the circuit principle structure of this utility model; Figure 2 This is a circuit diagram of the power module of this utility model; Figure 3 This is a circuit schematic diagram of the Bluetooth module of this utility model; Figure 4 This is a circuit schematic diagram of the main control module of this utility model; Figure 5This is a schematic diagram of the driving module of this utility model. Figure 6 This is a circuit diagram of the heating module of this utility model; Figure 7 This is a circuit diagram of the lighting module of this utility model; Figure 8 This is a circuit diagram of the fan module of this utility model; Figure 9 This is a circuit schematic diagram of the display module of this utility model; Figure 10 This is a circuit diagram of the adjustment module of this utility model; Figure 11 This is a circuit diagram of the prompt module of this utility model.

Detailed Implementation Methods

[0017] Specific embodiments, combined with Figures 1 to 11 As shown, further illustrating the technical solution of this utility model, an oven heating temperature control circuit includes a Bluetooth module 100, a main control module 200, a drive module 300, and a heating module 400. The wireless signal receiving end of the Bluetooth module 100 is used to receive the internal temperature signal of food collected by a Bluetooth probe. The control signal input end of the main control module 200 is connected to the wireless signal transmitting end of the Bluetooth module 100. When the main control module 200 receives the internal temperature signal of the food, it compares it with a preset heating temperature. If the temperature exceeds the preset heating temperature, it outputs a stop heating signal. The input end of the drive module 300 is connected to the control signal output end of the main control module 200. When the drive module 300 receives the stop heating signal, it outputs a stop heating drive signal. The input end of the heating module 400 is connected to the output end of the drive module 300. When the heating module 400 receives the stop heating drive signal, it stops heating the food.

[0018] In this embodiment, during the baking process, the oven uses a Bluetooth probe inserted into the food to collect the internal heating temperature in real time. The main control module monitors the internal heating temperature of the food in real time via the Bluetooth module, and stops heating the food when the internal heating temperature exceeds the preset heating temperature to prevent over-baking and burning. Secondly, compared with the traditional oven's monitoring method of inferring the doneness of food by the temperature of the baking cavity, this method can significantly improve the control accuracy of the baking temperature, ensuring that the food reaches the ideal doneness during baking, avoiding burnt on the outside and raw on the inside or overcooked and dry, effectively improving the baking success rate and the taste of the food.

[0019] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a power supply module 500, the input terminal of which is connected to the mains power supply, and the power supply module 500 is used to provide a stable operating voltage.

[0020] In a preferred embodiment, the power module 500 includes a rectifier unit 510, a first buck unit 520, and a second buck unit 530. The input terminal of the rectifier unit 510 is connected to the mains power supply, and the rectifier unit 510 is used to rectify the mains power supply to a 24V DC voltage. The input terminal of the first buck unit 520 is connected to the output terminal of the rectifier unit 510, and the first buck unit 520 is used to step down the 24V DC voltage to a 5V DC voltage. The input terminal of the second buck unit 530 is connected to the output terminal of the first buck unit 520, and the second buck unit 530 is used to step down the 5V DC voltage to a 3.3V DC voltage.

[0021] Optionally, the rectifier unit 510 includes a rectifier chip U3, a fuse F1, a thermistor NTC1, an inductor L1, and a polarized capacitor E1. The live wire terminal (i.e., AC-L1 terminal) of the mains power supply is connected to one end of the thermistor NTC1, and the other end of the thermistor NTC1 is connected to the first AC input terminal of the rectifier chip U3. The neutral wire terminal (i.e., AC-N1 and AC-N2 terminals) of the mains power supply is connected to one end of the fuse F1, and the other end of the fuse F1 is connected to the second AC input terminal of the rectifier chip U3. The positive output terminal (i.e., VO+ terminal) of the rectifier chip U3 is connected to one end of the inductor L1, and the other end of the inductor L1 is connected to the positive terminal of the polarized capacitor E1. The negative terminal of the polarized capacitor E1 is grounded, and the negative output terminal (i.e., VO- terminal) of the rectifier chip U3 is grounded.

[0022] The preferred model of the rectifier chip U3 is NS50A24.

[0023] In this embodiment, the fuse F1 and the thermistor NTC1 protect the circuit, enabling it to be cut off in time when an overload or short circuit occurs. The thermistor FR1 also suppresses the surge current generated at the moment of power-on, avoiding the risk of electric shock when the oven is powered on. Secondly, the rectifier chip U3 rectifies the AC power (i.e., mains power) into DC power, providing a stable DC power supply for other subsequent circuits. The inductor L1 filters the rectified DC power supply, reducing ripple and making it closer to ideal DC power, thus improving power quality.

[0024] Optionally, the first step-down unit 520 includes a step-down converter chip U2, a resistor R1, and a polarized capacitor E2. The output terminal of the rectifier unit 510 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the input terminal (i.e., VIN terminal) of the step-down converter chip U2, the output terminal (i.e., VOUT terminal) of the step-down converter chip U2 is connected to the positive terminal of the polarized capacitor E2, and the negative terminal of the polarized capacitor E2 is grounded.

[0025] The preferred model of the step-down converter chip U2 is AP2905.

[0026] Optionally, the second step-down unit 530 includes a linear regulator U1, a resistor R2, and a resistor R3. The output terminal of the first step-down unit 520 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the input terminal (i.e., VIN terminal) of the linear regulator U1, the output terminal (i.e., VOUT terminal) of the linear regulator U1 is connected to one end of the resistor R3, and the other end of the resistor R3 outputs a 3.3V DC voltage.

[0027] The preferred model of the linear regulator U1 is XC6206P.

[0028] In this embodiment, the 24V DC voltage is stepped down to 5V DC voltage and 3.3V DC voltage in stages by the step-down converter chip U2 and the linear regulator U1, so as to provide a stable and suitable driving power for other subsequent circuit modules.

[0029] Furthermore, as a preferred embodiment of this solution and not a limitation, the Bluetooth module 100 includes a Bluetooth chip 110 and a crystal oscillator unit 120. The wireless signal receiving end (i.e., ANT1 end) of the Bluetooth chip 110 is used to receive the internal temperature signal of food collected by the Bluetooth probe. The wireless signal transmitting end of the Bluetooth chip 110 is connected to the control signal input (i.e., BT-TXD end and BT-RXD end) of the main control module 200. The input end of the crystal oscillator unit 120 is connected to the crystal oscillator input end of the Bluetooth chip 110. The output end of the crystal oscillator unit 120 is connected to the crystal oscillator output end of the Bluetooth chip 110. The crystal oscillator unit is used to provide a reference clock source.

[0030] In this embodiment, the oven is equipped with a Bluetooth module, allowing users to monitor the heating temperature of food in real time via a mobile app. This eliminates the need for users to frequently open the oven to observe the baking status of the food. Additionally, users can remotely adjust the oven's baking temperature, baking time, and baking mode via the Bluetooth module, enhancing the user experience.

[0031] As a preferred implementation, the Bluetooth chip 110 is preferably of model AC6328A.

[0032] In a preferred embodiment, the crystal oscillator unit 120 includes a crystal oscillator Y2, a capacitor C11, and a capacitor C12. The input terminal of the crystal oscillator Y2 is connected to the crystal oscillator input terminal (i.e., the BT_OSCI terminal) of the Bluetooth chip 110, and the output terminal of the crystal oscillator Y2 is connected to the crystal oscillator output terminal (i.e., the BT_OSCO terminal) of the Bluetooth chip 110. The capacitor C11 is connected between the input terminal of the crystal oscillator Y2 and ground, and the capacitor C12 is connected between the output terminal of the crystal oscillator Y2 and ground.

[0033] The crystal oscillator Y2 is a 24MHz crystal oscillator.

[0034] In this embodiment, crystal oscillator Y2 is selected as a 24MHz crystal oscillator as a piezoelectric element. When the Bluetooth chip is powered on, it generates a piezoelectric effect under the excitation of the Bluetooth chip's startup voltage, causing it to vibrate stably at the mechanical resonant frequency. This vibration, in turn, generates a 24MHz alternating voltage between the two poles of crystal oscillator Y2 through the inverse piezoelectric effect. This feedback loop ultimately generates a 24MHz oscillation signal from the output of crystal oscillator Y2, ensuring that the Bluetooth communication frequency and the Bluetooth probe's transmission frequency are accurately matched, thus avoiding the loss of the food's internal temperature signal due to frequency deviation.

[0035] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the main control module 200 includes a main control chip, and the main control chip is preferably a GD32F303CGT6.

[0036] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the driving module 300 includes a driving chip U4, and the driving chip U4 is preferably an STM32F030F4P6.

[0037] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the heating module 400 includes a top heating unit 410 and a bottom heating unit 420. The heating end of the top heating unit 410 is connected to the top heating output end of the drive module 300. The top heating unit 410 is used to control the heating of the top heating element of the oven to heat up or stop heating. The heating end of the bottom heating unit 420 is connected to the bottom heating output end of the drive module 300. The bottom heating unit is used to control the heating of the bottom heating element of the oven to heat up or stop heating.

[0038] In this embodiment, the heating module can independently control the top heating element and the bottom heating element inside the baking cavity, thereby adjusting the heating temperature of the upper and lower surfaces of the food according to the characteristics of the food, ensuring that the food reaches the ideal degree of cooking. Compared with traditional ovens that simultaneously control the bottom and top heating elements, this avoids the phenomenon of the top of the baking cavity being too high and the bottom being too low, or the top of the baking cavity being too low and the bottom being too high, which would result in the food being burnt on top and raw on the bottom, or raw on top and burnt on the bottom.

[0039] In a preferred embodiment, the top heating unit 410 includes a relay K1, a transistor Q3, a diode D1, and a resistor R10. The top heating output terminal (i.e., RL1 terminal) of the driving module 300 is connected to one end of the resistor R10, and the other end of the resistor R10 is connected to the base of the transistor Q3. The emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 is connected to the first coil terminal of the relay K1. The collector of the transistor Q3 is also connected to the positive terminal of the diode D1, and the negative terminal of the diode D1 is connected to the second coil terminal of the relay K1. The output terminal of the rectifier unit 510 is connected to the second coil terminal of the relay K1. The normally open terminal of the relay K1 is connected to the live wire terminal (i.e., AC-L terminal) of the mains power supply, and the common terminal of the relay K1 is connected to the control terminal (i.e., UP-IN1 terminal) of the top heating tube.

[0040] In a preferred embodiment, the bottom heating unit 420 includes a relay K2, a transistor Q4, a diode D2, and a resistor R11. The bottom heating output terminal (i.e., the RL2 terminal) of the driving module 300 is connected to one end of the resistor R11, and the other end of the resistor R11 is connected to the base of the transistor Q4. The emitter of the transistor Q4 is grounded, and the collector of the transistor Q4 is connected to the first coil terminal of the relay K2. The collector of the transistor Q4 is also connected to the positive terminal of the diode D2, and the negative terminal of the diode D2 is connected to the second coil terminal of the relay K2. The output terminal of the rectifier unit 510 is connected to the second coil terminal of the relay K2. The normally open terminal of the relay K2 is connected to the live wire terminal (i.e., the AC-L terminal) of the mains power supply, and the common terminal of the relay K2 is connected to the control terminal (i.e., the DOWN1 terminal) of the bottom heating tube.

[0041] Specifically, when the oven needs to control the heating element at the top of the oven cavity to heat the food, the control signal output terminal (RXD and TXD terminals) of the main control module 200 outputs a top heating control command. After the input terminal of the drive module 300 receives the top heating control command, the top heating output terminal (RL1 terminal) of the drive module 300 outputs a high level. After the base of the transistor Q3 receives the high level output by the drive module 300, it conducts. After conduction, the collector of the transistor Q3 outputs a conduction current, which turns on the coil terminal of the relay K1. After the coil terminal of the relay K1 conducts, the contacts close, thus forming a conduction circuit for the top heating element, which then starts to heat the food. When the oven needs to control the heating element at the bottom of the oven cavity to heat the food, the control signal output terminal (RXD and TXD terminals) of the main control module 200 outputs a bottom heating control command. After the input terminal of the drive module 300 receives the bottom heating control command, the bottom heating output terminal (RL2 terminal) of the drive module 300 outputs a high level. After the base of the transistor Q4 receives the high level output by the drive module 300, it conducts. After conduction, the collector of the transistor Q4 outputs a conduction current, which turns on the coil terminal of the relay K2. After the coil terminal of the relay K2 conducts, the contacts are closed, thus forming a conduction circuit for the top heating element, which causes the bottom heating element to start heating the food. If the internal heating temperature of the food exceeds the preset heating temperature, the control signal output terminals (RXD and TXD terminals) of the main control module 200 will stop the heating signal. After the input terminal of the drive module 300 receives the stop heating signal, the top heating output terminal (RL1 terminal) and the bottom heating output terminal (RL2 terminal) of the drive module 300 will both output a low level. At this time, transistors Q3 and Q4 are both in the off state, which makes relays K1 and K2 also in the off state, so that the top heating tube and the bottom heating tube of the oven cavity stop heating the food.

[0042] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a lighting module 600 and a fan module 700. The lighting input terminal of the lighting module 600 is connected to the lighting output terminal of the drive module 300, and the lighting module 600 is used to control the lighting inside the oven. The fan input terminal of the fan module 700 is connected to the fan output terminal of the drive module 300, and the fan module 700 is used to drive the oven fan to rotate.

[0043] In this embodiment, the interior light of the oven allows the user to observe the baking status of the food without frequently opening the oven door, avoiding the loss of oven cavity temperature caused by frequent opening of the oven door during baking, which would affect the taste of the food; secondly, the fan on the oven can evenly spread the heat generated by the heating element to the entire baking cavity, avoiding the formation of local high temperatures around the heating element, which shortens the oven preheating time and reduces the wear and tear on the internal components of the baking cavity.

[0044] In a preferred embodiment, the lighting module 600 includes a transistor Q2, a silicon controlled rectifier (SCR) SR2, a resistor R9, and a first shunt unit. The lighting output terminal (i.e., LAMP terminal) of the driving module 300 is connected to one end of the resistor R9, the other end of the resistor R9 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is grounded, the collector of the transistor Q2 is connected to the input terminal of the first shunt unit, the output terminal of the first shunt unit is connected to the control electrode of the SCR SR2, the live wire terminal (i.e., AC-L terminal) of the AC power supply is connected to the first main electrode of the SCR SR2, and the second main electrode of the SCR SR2 is connected to the control terminal (i.e., LAMP1 terminal) of the lighting lamp.

[0045] Optionally, the first shunt unit is composed of resistors R6 and R7 connected in parallel.

[0046] Specifically, when the oven needs to use the light, the control signal output terminal (RXD and TXD terminals) of the main control module 200 outputs a lighting control command. After the input terminal of the drive module 300 receives the lighting control command, the lighting output terminal (LAMP terminal) of the drive module 300 outputs a high level. After the base of transistor Q2 receives the high level output by the drive module 300, it conducts. After conduction, the collector of transistor Q3 outputs a conduction current, which is shunt by the shunt circuit composed of resistors R6 and R7 in parallel, and then flows through the control electrode of the thyristor SR2, making the thyristor SR2 conduct, thereby controlling the light to be lit.

[0047] In a preferred embodiment, the fan module 700 includes a transistor Q1, a silicon controlled rectifier (SCR) SR1, a resistor R8, and a second shunt unit. The fan output terminal (i.e., the MOTO1 terminal) of the drive module 300 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to the input terminal of the second shunt unit, the output terminal of the second shunt unit is connected to the control terminal of the SCR SR1, the live wire terminal (i.e., the AC-L terminal) of the AC power supply is connected to the first main electrode of the SCR SR1, and the second main electrode of the SCR SR1 is connected to the control terminal (i.e., the MOTO1 terminal) of the fan drive motor.

[0048] Optionally, the second shunt unit consists of resistors R4 and R5 connected in parallel.

[0049] Specifically, when the oven is heating food, the control signal terminals (RXD and TXD terminals) of the main control module 200 will also output fan control commands. After the input terminal of the drive module 300 receives the fan control commands, the fan output terminal (MOTO1 terminal) of the drive module 300 outputs a high level. After the base of the transistor Q1 receives the high level output by the drive module 300, it conducts. After conduction, the collector of the transistor Q1 outputs a conduction current, which is shunt by the shunt circuit composed of resistors R4 and R5 in parallel, and then flows through the control electrode of the thyristor SR1, making the thyristor conduct, thereby driving the fan to rotate.

[0050] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a display module 800, the display signal terminal of which is connected to the display signal terminal of the main control module 200, and the display module 800 is used to display the working information of the oven.

[0051] The working information includes, but is not limited to, the oven's parameter settings and the oven's working status.

[0052] In a preferred embodiment, the display module 800 includes a display screen interface J1, and the display signal terminals (i.e., LCD-RX and LCD-TX terminals) of the main control module 200 are connected to the display signal terminals of the display screen interface J1.

[0053] In this embodiment, the oven is equipped with a display screen, which allows users to conveniently view real-time oven operating information such as the internal heating temperature of the food, baking temperature, baking time, and baking mode. This allows users to adjust the oven mode or parameters according to the actual heating status of the food.

[0054] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes an adjustment module 900, the adjustment end of which is connected to the adjustment end of the main control module 200, and the adjustment module 900 is used to adjust the parameter settings of the oven and select the baking mode of the oven.

[0055] In a preferred embodiment, the adjustment module 900 includes buttons K1, K2, K3, and K4. The first ends of buttons K1, K2, K3, and K4 are connected in parallel and then grounded. The second end of button K1 is connected to the first button adjustment terminal (i.e., KEY1 terminal) of the main control module 200. The second end of button K2 is connected to the second button adjustment terminal (i.e., KEY2 terminal) of the main control module 200. The second end of button K3 is connected to the third button adjustment terminal (i.e., KEY3 terminal) of the main control module 200. The second end of button K4 is connected to the fourth button adjustment terminal (i.e., KEY4 terminal) of the main control module 200.

[0056] It is worth noting that the aforementioned buttons K1, K2, K3, and K4 are configured with different adjustment functions to adjust oven parameters and baking modes. For example, button K1 is configured as a start / stop button to control the oven to start or pause baking; button K2 is configured as a temperature adjustment button to adjust the oven's baking temperature; button K3 is configured as a time adjustment button to adjust the oven's baking time; and button K4 is configured as a mode switching button to switch the oven's baking mode.

[0057] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a prompting module 1000, the prompting signal terminal of the prompting module 1000 being connected to the prompting signal terminal of the main control module 200, the prompting module 1000 being used to issue a prompting sound when the oven malfunctions or when the oven baking ends.

[0058] In a preferred embodiment, the prompting module 1000 includes a buzzer BUZ1, a transistor Q6, and a resistor R30. The prompting signal terminal (i.e., SPK terminal) of the main control module 200 is connected to one end of the resistor R30, the other end of the resistor R30 is connected to the base of the transistor Q6, the emitter of the transistor Q6 is grounded, the collector of the transistor Q6 is connected to the prompting signal terminal of the buzzer BUZ1, and the power supply terminal of the buzzer BUZ1 is connected to the output terminal of the first step-down unit 520.

[0059] In this embodiment, if any abnormality occurs during the baking process, the buzzer BUZ1 will continuously emit a beeping sound to quickly remind the user that the oven has malfunctioned, preventing the problem from escalating due to failure to address it in time. In addition, after the food is finished baking, the buzzer BUZ1 will emit a beeping sound to remind the user that baking is complete, allowing the user to remove the food from the oven in time, preventing the food from being over-baked due to continuous heat retention or residual heat in the oven, which would affect the taste of the food.

[0060] Those skilled in the art should understand that the above description is one embodiment provided in conjunction with specific content, and does not imply that the specific implementation of this utility model is limited to these descriptions. Furthermore, due to differences in industry naming conventions, it is not limited to the above names or English names. Any methods or structures similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the scope of protection of this utility model.

Claims

1. A heating temperature control circuit for an oven, characterized in that, include: A Bluetooth module, wherein the wireless signal receiver of the Bluetooth module is used to receive the internal temperature signal of food collected by the Bluetooth probe; The main control module has its control signal input terminal connected to the wireless signal transmitter of the Bluetooth module. When the main control module receives the internal temperature signal of the food, it compares it with the preset heating temperature. If the temperature exceeds the preset heating temperature, it outputs a stop heating signal. A drive module, the input terminal of which is connected to the control signal output terminal of the main control module, is used to output a stop heating drive signal when the stop heating signal is received; A heating module, the input of which is connected to the output of the drive module, is used to stop heating food when it receives the stop heating drive signal.

2. The oven heating temperature control circuit according to claim 1, characterized in that, Also includes: A power module, the input terminal of which is connected to an AC power source, is used to provide a stable operating voltage.

3. The oven heating temperature control circuit according to claim 2, characterized in that, The power module includes: A rectifier unit, the input terminal of which is connected to the mains power supply, is used to rectify the mains power supply into a 24V DC voltage; The first step-down unit has its input terminal connected to the output terminal of the rectifier unit. The first step-down unit is used to step down the 24V DC voltage to a 5V DC voltage. The second step-down unit has its input terminal connected to the output terminal of the first step-down unit. The second step-down unit is used to step down the 5V DC voltage to a 3.3V DC voltage.

4. The oven heating temperature control circuit according to claim 1, characterized in that, The Bluetooth module includes: A Bluetooth chip, wherein the wireless signal receiving end of the Bluetooth chip is used to receive the internal temperature signal of the food from the Bluetooth probe, and the wireless signal transmitting end of the Bluetooth chip is connected to the control signal input end of the main control module; The crystal oscillator unit has its input terminal connected to the crystal oscillator input terminal of the Bluetooth chip and its output terminal connected to the crystal oscillator output terminal of the Bluetooth chip. The crystal oscillator unit is used to provide a reference clock source.

5. The oven heating temperature control circuit according to claim 4, characterized in that, The crystal oscillator unit includes crystal oscillator Y2, capacitor C11, and capacitor C12. The input terminal of crystal oscillator Y2 is connected to the crystal oscillator input terminal of the Bluetooth chip, and the output terminal of crystal oscillator Y2 is connected to the crystal oscillator output terminal of the Bluetooth chip. Capacitor C11 is connected between the input terminal of crystal oscillator Y2 and ground, and capacitor C12 is connected between the output terminal of crystal oscillator Y2 and ground.

6. The oven heating temperature control circuit according to claim 3, characterized in that, The heating module includes: A top heating unit, the heating end of which is connected to the top heating output end of the drive module, is used to control the top heating element of the oven to heat up or stop heating; The bottom heating unit is connected to the bottom heating output terminal of the drive module. The bottom heating unit is used to control the bottom heating element of the oven to heat up or stop heating.

7. The oven heating temperature control circuit according to claim 6, characterized in that, The top heating element unit includes a relay K1, a transistor Q3, a diode D1, and a resistor R10. The top heating output terminal of the drive module is connected to one end of the resistor R10, and the other end of the resistor R10 is connected to the base of the transistor Q3. The emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 is connected to the first coil terminal of the relay K1. The collector of the transistor Q3 is also connected to the positive terminal of the diode D1, and the negative terminal of the diode D1 is connected to the second coil terminal of the relay K1. The output terminal of the rectifier unit is connected to the second coil terminal of the relay K1. The normally open terminal of the relay K1 is connected to the live wire of the mains power supply, and the common terminal of the relay K1 is connected to the control terminal of the top heating element.

8. The oven heating temperature control circuit according to claim 6, characterized in that, The bottom heating unit includes a relay K2, a transistor Q4, a diode D2, and a resistor R11. The bottom heating output terminal of the drive module is connected to one end of the resistor R11, and the other end of the resistor R11 is connected to the base of the transistor Q4. The emitter of the transistor Q4 is grounded, and the collector of the transistor Q4 is connected to the first coil terminal of the relay K2. The collector of the transistor Q4 is also connected to the positive terminal of the diode D2, and the negative terminal of the diode D2 is connected to the second coil terminal of the relay K2. The output terminal of the rectifier unit is connected to the second coil terminal of the relay K2. The normally open terminal of the relay K2 is connected to the live wire of the mains power supply, and the common terminal of the relay K2 is connected to the control terminal of the bottom heating tube.

9. The oven heating temperature control circuit according to claim 1, characterized in that, Also includes: A lighting module, wherein the lighting input terminal of the lighting module is connected to the lighting output terminal of the drive module, and the lighting module is used to control the lighting inside the oven to be turned on; A fan module, wherein the fan input terminal of the fan module is connected to the fan output terminal of the drive module, and the fan module is used to drive the fan of the oven to rotate.

10. The oven heating temperature control circuit according to claim 1, characterized in that, Also includes: The display module has a display signal terminal connected to the display signal terminal of the main control module, and the display module is used to display oven operating information.

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