Steaming oven control system and method and steaming oven

Abstract

The invention provides a steam oven control system and method and a steam oven, and belongs to the field of steam ovens, the steam oven control system comprises a main control circuit, a thermocouple circuit, a relay drive circuit, an MOSFET tube drive circuit and a power supply circuit, the thermocouple circuit is connected with a plurality of temperature probes, the temperature probes are located at different positions in the steam oven, the main control circuit is connected with the thermocouple circuit, and the thermocouple circuit is connected with the relay drive circuit. The thermocouple circuit is used for controlling the thermocouple circuit to select a temperature probe and transmitting the temperature to the main control circuit, the output end of the relay driving circuit is connected to a fan M, the main control circuit is connected with the input end of the relay driving circuit and used for controlling starting and stopping of the fan M, and the output end of the MOSFET driving circuit is connected to a coil of the relay SSR1 and a water inlet electromagnetic valve YV1. The main control circuit is connected with the input end of the MOSFET driving circuit and used for controlling a coil of the relay SSR1 and the water inlet electromagnetic valve YV1 to be powered on or powered off; the four modes of steam, dry baking, steaming baking and center temperature meet the cooking requirements of various food materials, and the small-sized design is suitable for ship cabins with limited sizes.

Description

Technical Field

[0001] The present invention relates to the technical field of steam ovens, and in particular to a steam oven control system, method and steam oven. Background Art

[0002] At present, most of the multifunctional steam ovens on the market are relatively large in size with comprehensive functions. In order to achieve underwater use, the product must be miniaturized and various functions such as steaming, baking, and steaming and baking must be ensured to be stable. For example, the Chinese utility model patent "A kind of electric multifunctional steam oven for ships" with the publication number CN221242500U improves the structure of the steam oven, fixes the support feet at the bottom of the steam oven body, and fixes the positioning frame on the left and right outer walls of the steam oven body. The anti-skid pad is fixed at the bottom of the support feet. When the steam oven is placed on the shelf, the anti-skid pad increases the friction between the support feet and the placement surface. The anti-skid pad can enhance the anti-skid performance of the steam oven body, which helps to improve the stability of the placement of the steam oven body. The steam oven body can be fixed on the shelf by the fixing bolts on the positioning frame, which effectively ensures the stability of the steam oven body placed on the ship. However, the patent does not provide how to ensure the stability of various functions such as steaming, baking, and steaming and baking to meet the cooking needs of various ingredients. Summary of the invention

[0003] The technical problem to be solved by the present invention is how to accurately control the temperature and humidity of the steam oven to meet the different cooking requirements of various ingredients.

[0004] The present invention solves the above technical problems through the following technical solutions: a steam oven control system, comprising a main control circuit, a thermocouple circuit, a relay drive circuit, a MOSFET tube drive circuit, and a power supply circuit. The thermocouple circuit is connected to a plurality of temperature probes, which are located at different positions in the steam oven. The main control circuit is connected to the thermocouple circuit, and is used to control the thermocouple circuit to select the temperature probe, and transmit the temperature of the temperature probe to the main control circuit. The output end of the relay drive circuit is connected to a fan M, and the main control circuit is connected to the input end of the relay drive circuit, and is used to control the start and stop of the fan M, which is located on the steam oven. The output end of the MOSFET tube drive circuit is connected to the coil of the relay SSR1 and the water inlet electromagnetic valve YV1, and the main control circuit is connected to the input end of the MOSFET tube drive circuit, and is used to control the coil of the relay SSR1 and the water inlet electromagnetic valve YV1 to be energized or de-energized. The relay SSR1 is connected in series with an electric heating element, which is located inside the steam oven, and the water inlet electromagnetic valve YV1 is located on the steam oven. The power supply circuit is used to supply power to the main control circuit, the thermocouple circuit, the relay drive circuit, and the MOSFET tube drive circuit.

[0005] Beneficial effect: The output end of the MOSFET tube driving circuit is connected to the coil of the relay SSR1, and the relay SSR1 is connected in series with the electric heating element. The coil of the relay SSR1 is energized or de-energized through the main control circuit, thereby controlling whether the electric heating element is heated. By placing temperature probes at different positions in the steam oven, the temperature probes are connected to the thermocouple circuit, and the main control circuit is used to control the thermocouple circuit to select temperature probes at different positions, and transmit the temperature of the temperature probes to the main control circuit. When the temperature is too high or too low, the temperature is controlled within the set range by reducing or increasing the heating power of the electric heating element, thereby realizing accurate control of the temperature of the steam oven. The MOSFET tube driving circuit The output end of the circuit is connected to the water inlet solenoid valve YV1, and the main control circuit controls the water inlet solenoid valve YV1 to be energized or de-energized, thereby controlling whether water vapor is generated. The fan is connected to the output end of the relay drive circuit, and the relay drive circuit is controlled by the main control circuit to control the start and stop of the fan M. When the fan is working, the hot air can be circulated evenly to the inside of the steam oven, so that the food is heated evenly. The steam oven control system of the present invention can control the steam oven to work in four different working modes: steam mode, dry baking mode, steam baking mode, and center temperature mode. In actual use, the corresponding working mode is selected according to the cooking requirements of different foods, and the cooking requirements of various ingredients can be met. In addition, the modular design structure of the control system of the present invention is clear, reliable, easy to expand and maintain, meets the miniaturized design, is suitable for ship cabins with limited size, and can meet the needs of underwater living operations.

[0006] Preferably, the main control circuit includes a chip U1, a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a thirty-eighth pin, a ninety-seventh pin, and a ninety-eighth pin of the chip U1 are connected to a relay drive circuit, a sixth pin of the chip U1 is connected in series with a capacitor C2 and then connected to ground, a tenth pin of the chip U1 is connected in series with a capacitor C3 and then connected to the eleventh pin of the chip U1, a twenty-first pin of the chip U1 is connected in series with a capacitor C20 and then grounded, a twenty-second pin of the chip U1 is connected in series with a capacitor C4 and then grounded, a twenty-eighth pin of the chip U1 is connected in series with a capacitor C10 and then grounded, a twenty-ninth pin, a thirtieth pin, and a thirty-first pin of the chip U1 are connected to a thermocouple circuit, a forty-ninth pin of the chip U1 is connected in series with a capacitor C17 and then connected to the fiftieth pin of the chip U1, and a The fifty-fifth to sixty-second pins of chip U1 are connected to the MOSFET tube driving circuit, the seventy-fourth pin of chip U1 is connected in series with capacitor C9 and then connected to the seventy-fifth pin of chip U1, the eighty-first pin of chip U1 is connected to the ninth pin of chip U3 and the ninth pin of chip U4 in the thermocouple circuit, the eighty-second and eighty-third pins of chip U1 are connected to the thermocouple circuit, the ninety-ninth pin of chip U1 is connected in series with capacitor C1 and then connected to the hundredth pin of chip U1, the tenth pin, nineteenth pin, twentieth pin, twenty-seventh pin, forty-ninth pin, seventy-fourth pin and ninety-ninth pin of chip U1 are all grounded, the eleventh pin, twenty-first pin, twenty-eighth pin, fifty pin, seventy-fifth pin and hundredth pin of chip U1 are all connected to 3.3V voltage.

[0007] Beneficial effect: By controlling the thermocouple circuit, relay drive circuit and MOSFET tube drive circuit respectively through chip U1, the internal temperature and humidity can be monitored in real time. By controlling the heating of the electric heating element, the start and stop of the fan and whether to add water to the electric heating element to generate steam, the internal temperature, humidity, time and other parameters of the steam oven can be accurately controlled, so that it can be automatically adjusted according to different foods and cooking needs, making cooking safer and smarter.

[0008] Preferably, the thermocouple circuit includes a chip U3, a chip U4, a chip U8, a resistor R66, and a capacitor C29. The first pin of the chip U3 and the first pin of the chip U4 are respectively connected to the two ends of the fifth temperature probe, the second pin of the chip U3 and the second pin of the chip U4 are respectively connected to the two ends of the seventh temperature probe, the fourth pin of the chip U3 and the fourth pin of the chip U4 are respectively connected to the two ends of the eighth temperature probe, the fifth pin of the chip U3 and the fifth pin of the chip U4 are respectively connected to the two ends of the sixth temperature probe, the twelfth pin of the chip U3 and the twelfth pin of the chip U4 are respectively connected to the two ends of the fourth temperature probe, the thirteenth pin of the chip U3 and the thirteenth pin of the chip U4 are respectively connected to the two ends of the first temperature probe, the fourteenth pin of the chip U3 and the fourteenth pin of the chip U4 are respectively connected to the two ends of the second temperature probe, the fifteenth pin of the chip U3 and the fifteenth pin of the chip U4 are respectively connected to the two ends of the third temperature probe, the third pin of the chip U3 is respectively connected to one end of the resistor R66 and the second pin of the chip U8, and the The other end is connected to the first pin of chip U8 and then grounded, the third pin of chip U4 is connected to the third pin of chip U8, the sixth pin, the seventh pin and the eighth pin of chip U3 are all grounded, the ninth pin of chip U3 is connected to the eighty-first pin of chip U1, the tenth pin of chip U3 is connected to the eighty-second pin of chip U1, the eleventh pin of chip U3 is connected to the eighty-third pin of chip U1, the third pin of chip U4 is connected to the third pin of chip U8, the sixth pin, the seventh pin and the eighth pin of chip U4 are all grounded, the ninth pin of chip U4 is connected to the eighty-first pin of chip U1, the tenth pin of chip U4 is connected to the eighty-second pin of chip U1, the eleventh pin of chip U4 is connected to the eighty-third pin of chip U1, the fourth pin of chip U8 is connected in series with capacitor C29 and then grounded, the fourth pin is connected to a 3.3V voltage, the fifth pin of chip U8 is connected to the thirtieth pin of chip U1, the sixth pin of chip U8 is connected to the twenty-ninth pin of chip U1, and the seventh pin of chip U8 is connected to the thirty-first pin of chip U1.

[0009] Beneficial effects: The thermocouple circuit can connect to multiple temperature probes. The main control circuit sends signals to the ninth, tenth and eleventh pins of chip U3 and chip U4 respectively for chip selection. Chip U8 converts the analog temperature into a digital quantity and transmits the temperature to the main control circuit. Placing multiple temperature probes at different positions in the steam oven can realize temperature monitoring at multiple positions inside the steam oven.

[0010] Preferably, the relay drive circuit includes a chip U13, a resistor R11, a resistor R12, resistors R17-R22, a light emitting diode LED12-LED19, and a plurality of relays U57-U64, wherein the first pin of the chip U3 is connected to the thirty-eighth pin of the chip U1, the second pin of the chip U13 is connected to the fifth pin of the chip U1, the third pin of the chip U13 is connected to the fourth pin of the chip U1, the fourth pin of the chip U13 is connected to the third pin of the chip U1, the fifth pin of the chip U13 is connected to the second pin of the chip U1, the sixth pin of the chip U13 is connected to the first pin of the chip U1, the seventh pin of the chip U13 is connected to the ninety-eighth pin of the chip U1, and the eighth pin of the chip U13 is connected to the To the ninety-seventh pin of chip U1, the ninth pin of chip U13 is grounded, the tenth pin of chip U13 is connected to 5V voltage, the eleventh pin of chip U13 is respectively connected to one end of resistor R20 and one end of the coil of relay U57, the other end of resistor R20 is connected to the cathode of light-emitting diode LED16, the anode of light-emitting diode LED16 is connected to the other end of the coil of relay U57, the twelfth pin of chip U13 is respectively connected to one end of resistor R12 and one end of the coil of relay U58, the other end of resistor R12 is connected to the cathode of light-emitting diode LED13, the anode of light-emitting diode LED13 is connected to the other end of the coil of relay U58, the thirteenth pin of chip U13 is respectively connected to one end of resistor R18 , one end of the coil of relay U59, the other end of resistor R18 is connected to the cathode of light-emitting diode LED15, the anode of light-emitting diode LED15 is connected to the other end of the coil of relay U59, the fourteenth pin of chip U13 is respectively connected to one end of resistor R19 and one end of the coil of relay U60, the other end of resistor R19 is connected to the cathode of light-emitting diode LED17, the anode of light-emitting diode LED17 is connected to the other end of the coil of relay U60, the fifteenth pin of chip U13 is respectively connected to one end of resistor R22 and one end of the coil of relay U61, the other end of resistor R22 is connected to the cathode of light-emitting diode LED19, the anode of light-emitting diode LED19 is connected to the other end of the coil of relay U61 One end, the sixteenth pin of the chip U13 is respectively connected to one end of the resistor R21 and one end of the coil of the relay U62, the other end of the resistor R21 is connected to the cathode of the light-emitting diode LED18, the anode of the light-emitting diode LED18 is connected to the other end of the coil of the relay U62, the seventeenth pin of the chip U13 is respectively connected to one end of the resistor R17 and one end of the coil of the relay U63, the other end of the resistor R17 is connected to the cathode of the light-emitting diode LED14, the anode of the light-emitting diode LED14 is connected to the other end of the coil of the relay U63, the eighteenth pin of the chip U13 is respectively connected to one end of the resistor R11 and one end of the coil of the relay U64, the other end of the resistor R11 is connected to the cathode of the light-emitting diode LED12,The anode of the light emitting diode LED12 is connected to the other end of the coil of the relay U64.

[0011] Beneficial effect: The relay drive circuit can be connected to multiple DC or AC loads, and high / low levels are given to the first pin to the eighth pin of the chip U13 to control the corresponding 8 relays U57-U64 respectively, thereby realizing the control of multiple loads.

[0012] Preferably, the MOSFET tube driving circuit includes a chip U6, a resistor R1, a resistor R4, a resistor R5-R9, a resistor R81-R88, a light-emitting diode LED4-LED11, a field effect tube Q22-Q25, a field effect tube Q33-Q36, a chip U75, and a chip U76. The first pin, the second pin, the third pin, the fourth pin, the fifth pin, the sixth pin, the seventh pin, and the eighth pin of the chip U6 are respectively connected to the sixty-second pin, the sixty-first pin, the sixtieth pin, the fifty-ninth pin, the fifty-eighth pin, the fifty-seventh pin, the fifty-sixth pin, and the fifty-fifth pin of the chip U1. The ninth pin of the chip U6 is connected to the The tenth pin of chip U6 is connected to the 5V voltage and one end of resistors R81-R88 respectively. The eleventh to eighteenth pins of chip U6 are connected to the other ends of resistors R81-R88 respectively. The eleventh pin of chip U6 is connected to one end of resistor R4 and the gate of field effect transistor Q22 respectively. The twelfth pin of chip U6 is connected to one end of resistor R6 and the gate of field effect transistor Q23 respectively. The thirteenth pin of chip U6 is connected to one end of resistor R8 and the gate of field effect transistor Q24 respectively. The fourteenth pin of chip U6 is connected to one end of resistor R10 and the gate of field effect transistor Q25 respectively. The fifteenth pin of chip U6 is connected to the resistors One end of R1 and the gate of field effect transistor Q33, the sixteenth pin of chip U6 is respectively connected to one end of resistor R5 and the gate of field effect transistor Q34, the seventeenth pin of chip U6 is respectively connected to one end of resistor R7 and the gate of field effect transistor Q35, the eighteenth pin of chip U6 is respectively connected to one end of resistor R9 and the gate of field effect transistor Q36, the cathode of light-emitting diode LED5 is connected to the source of field effect transistor Q22 and then grounded, the drain of field effect transistor Q22 is connected to the first pin of chip U75, the cathode of light-emitting diode LED7 is connected to the source of field effect transistor Q23 and then grounded, and the drain of field effect transistor Q23 is connected to the third pin of chip U75 , the cathode of the light-emitting diode LED9 is connected to the source of the field effect transistor Q24 and then grounded, the drain of the field effect transistor Q24 is connected to the fifth pin of the chip U75, the cathode of the light-emitting diode LED11 is connected to the source of the field effect transistor Q25 and then grounded, the drain of the field effect transistor Q25 is connected to the seventh pin of the chip U75, the cathode of the light-emitting diode LED4 is connected to the source of the field effect transistor Q33 and then grounded, the cathode of the light-emitting diode LED6 is connected to the source of the field effect transistor Q34 and then grounded, the cathode of the light-emitting diode LED8 is connected to the source of the field effect transistor Q35 and then grounded, the cathode of the light-emitting diode LED10 is connected to the source of the field effect transistor Q36 and then grounded,The other ends of resistors R4, R6, R8, R10, R1, R5, R7, and R9 are respectively connected to the anodes of light-emitting diodes LED5, LED7, LED9, LED11, LED4, LED6, LED8, and LED10, and the drains of field effect transistors Q33-Q36 are respectively connected to the first pin, the third pin, the fifth pin, and the seventh pin of chip U76.

[0013] Beneficial effect: MOSFET control is realized by connecting 8 groups of field effect tube circuits through chip U6, the drains of the 8 field effect tubes are connected to 2 groups of connectors, each connector has 8 pins, two by two, connected to the load circuit, and the on and off of the load circuit is realized through program control.

[0014] Preferably, it also includes an RJ45 network port circuit, wherein the RJ45 network port circuit includes a network port chip J1, resistors R70-R72, resistors R89-R92, capacitors C110, and capacitors C116, the sixth pin of the network port chip J1 is connected in series with the resistor R89 ​​and then connected to the sixty-fourth pin of the chip U1, the third pin of the network port chip J1 is connected in series with the resistor R90 and then connected to the sixty-third pin of the chip U1, the second pin of the network port chip J1 is connected in series with the resistor R91 and then connected to the sixty-sixth pin of the chip U1, and the network The first pin of the network port chip J1 is connected in series with the resistor R92 and then connected to the sixty-fifth pin of the chip U1, the fourth pin of the network port chip J1 is connected to the fifth pin and then connected to a 3.3V voltage, and is connected in series with the capacitor C110 and then grounded, the ninth pin of the network port chip J1 is connected in series with the resistor R70 and then connected to a 3.3V voltage, the twelfth pin is connected in series with the resistor R71 and then connected to a 3.3V voltage, the eleventh pin of the network port chip J1 is connected to the fifteenth pin of the chip U1, and the tenth pin of the network port chip J1 is connected to the sixteenth pin of the chip U1.

[0015] Preferably, the power supply circuit includes a 5V to 3.3V power supply conversion circuit, which includes a chip U2, capacitors C5-C8, a resistor R2, and a light-emitting diode LED1. The model of chip U2 is AMS1117-3.3. The first pin of chip U2 is respectively connected to one end of capacitors C5-C8, the cathode of light-emitting diode LED1, the second pin of pin P1 and grounded. The second pin of chip U2 is respectively connected to the fourth pin of chip U2, the other end of capacitor C7, the other end of capacitor C8, and one end of resistor R2 and outputs a 3.3V voltage. The other end of resistor R2 is connected to the anode of light-emitting diode LED1. The third pin of chip U2 is respectively connected to the other end of capacitor C5, the other end of capacitor C6, the first pin of pin P1 and connected to the input 5V voltage.

[0016] Preferably, the power supply circuit also includes a 24V to 12V power supply conversion circuit, which includes a chip U5, a transformer L2, a capacitor C16, a capacitor C18, a capacitor C19, a capacitor C21, a capacitor C22, a capacitor CY1, and a capacitor CY2. The model of the chip U5 is VRB2412S-6WR3. The first pin of the chip U5 is respectively connected to the secondary side opposite-name end of the transformer L2, one end of the capacitor C19, one end of the capacitor C21, and one end of the capacitor CY2. The second pin of the chip U5 is respectively connected to the primary side opposite-name end of the transformer L2, the other end of the capacitor C19, and the other end of the capacitor C21. The other end, one end of capacitor CY1, the sixth pin of chip U5 is respectively connected to the other end of capacitor CY1, one end of capacitor C16, and the second pin of pin P3 and outputs 12V voltage, the seventh pin of chip U5 is respectively connected to the other end of capacitor CY2, the other end of capacitor C167 and grounded, the primary side of transformer L2 with the same name ends are respectively connected to one end of capacitor C18, one end of capacitor C22, the first pin of pin P2, the first pin of pin P3 and connected to the input 24V voltage, the secondary side of transformer L2 with the same name ends are respectively connected to the other end of capacitor C18, the other end of capacitor C22, the second pin of pin P1 and grounded.

[0017] Beneficial effects: No additional power supply is required, with built-in power conversion circuit, through pin P1, the external +5V power supply is converted into +3.3V through chip U2, providing stable power supply to each module in the circuit. Through pin P2, through transformer L2 and DC module chip U5, the external +24V power supply is converted into 12V for the serial screen interface circuit (chip U55), and the P3 pin can also lead out +24V power supply, which can provide stable power supply to each module in the circuit.

[0018] The present invention also provides a steam oven control method. The steam oven control system is applied, the main control circuit inputs a control signal to the MOSFET tube drive circuit, the coil of the relay SSR1 is energized, the electric heating element starts to heat, the thermocouple circuit collects the temperatures of multiple temperature probes in the steam oven in real time, the main control circuit inputs a control signal to the relay drive circuit, the fan M is operated, and the working mode is selected. When the working mode is the steam mode or the steam-baking mode, the main control circuit receives the temperature of the temperature probe. When the temperature is too high or too low, the main control circuit inputs a control signal to the MOSFET tube drive circuit, the coil of the relay SSR1 is de-energized or energized to adjust the temperature, the main control circuit inputs a control signal to the MOSFET tube drive circuit, the water inlet solenoid valve YV1 is energized, and steam is generated. When the working mode is the dry-baking mode, the main control circuit inputs a control signal to the MOSFET tube drive circuit, the water inlet solenoid valve YV1 is de-energized, and no steam is generated. When the working mode is the center temperature mode, a plurality of temperature probes are inserted into the food, and the main control circuit adjusts the temperature according to the received temperatures.

[0019] The present invention also provides a steam oven, including the steam oven control system, and also includes a box, an electric heating element, a temperature probe, a steam generator, and a fan. The control system is located on the box, the electric heating element is located inside the box, and multiple temperature probes are located at different positions in the box. The steam generator and the fan are both located on the side of the box, and the water inlet solenoid valve YV1 is connected to the water inlet pipe of the steam generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional diagram of a steam oven provided in Embodiment 1 of the present invention;

[0021] Figure 2 The electrical schematic diagram of the steam oven control system provided in Example 1 of the present invention;

[0022] Figure 3 The electrical schematic diagram of the steam oven control system provided in Example 1 of the present invention;

[0023] Figure 4 A circuit diagram of a main control circuit in a steam oven control system provided in Embodiment 1 of the present invention;

[0024] Figure 5 A circuit diagram of a reset circuit in a steam oven control system provided in Embodiment 1 of the present invention;

[0025] Figure 6 A circuit diagram of a crystal oscillator circuit in a steam oven control system provided in Embodiment 1 of the present invention;

[0026] Figure 7 A circuit diagram of a downloading and operation indicating circuit in a steam oven control system provided in Embodiment 1 of the present invention;

[0027] Figure 8 A circuit diagram of a current detection interface circuit in a steam oven control system provided in Example 1 of the present invention;

[0028] Fig. 9 A circuit diagram of a voltage detection interface circuit in a steam oven control system provided in Embodiment 1 of the present invention;

[0029] Fig.10 A circuit diagram of an I / O lead interface circuit in a steam oven control system provided in Example 1 of the present invention;

[0030] Fig.11 A circuit diagram of a thermocouple circuit in a steam oven control system provided in Example 1 of the present invention;

[0031] Fig.12 A circuit diagram of a relay drive circuit in a steam oven control system provided in Embodiment 1 of the present invention;

[0032] Fig.13 A circuit diagram of a MOSFET tube driving circuit in a steam oven control system provided in Example 1 of the present invention;

[0033] Fig.14 A circuit diagram of various serial port circuits in a steam oven control system provided in Example 1 of the present invention;

[0034] Fig.15 A circuit diagram of an RJ45 network port circuit in a steam oven control system provided in Example 1 of the present invention;

[0035] Fig.16 A circuit diagram of a 5V to 3.3V power conversion circuit in a steam oven control system provided in Example 1 of the present invention;

[0036] Fig.17 A circuit diagram of a 24V to 12V power conversion circuit in a steam oven control system provided in Example 1 of the present invention;

[0037] Fig.18 This is a practical operation flow chart of the steam oven provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution of the present invention is clearly and completely described below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Example 1

[0040] like Figure 1 As shown, this embodiment provides a steam oven, including a box body 10, an electric heating element 20, a temperature probe, a steam generator, and a fan 40. The electric heating element 20 is located inside the box body 10, and multiple temperature probes are located at different positions in the box body 10. The steam generator and the fan 40 are both located on the side of the box body 10, and the water inlet solenoid valve 31 is connected to the water inlet pipe 32 of the steam generator.

[0041] like Figure 2-17As shown, this embodiment provides a steam oven control system, including a main control circuit, a thermocouple circuit, a relay drive circuit, a MOSFET tube drive circuit, and a power supply circuit. The thermocouple circuit is connected to a plurality of temperature probes, and the plurality of temperature probes are located at different positions in the steam oven. The main control circuit is connected to the thermocouple circuit, and is used to control the thermocouple circuit to select the temperature probe, and transmit the temperature of the temperature probe to the main control circuit. The output end of the relay drive circuit is connected to the fan M, and the main control circuit is connected to the input end of the relay drive circuit, and is used to control the start and stop of the fan M, which is located on the steam oven. The output end of the MOSFET tube drive circuit is connected to the coil of the relay SSR1 and the water inlet solenoid valve YV1, and the main control circuit is connected to the input end of the MOSFET tube drive circuit, and is used to control the coil of the relay SSR1 and the water inlet solenoid valve YV1 to be energized or de-energized. The relay SSR1 is connected in series with the electric heating element, and the electric heating element is located inside the steam oven. The water inlet solenoid valve YV1 is located on the steam oven. The power supply circuit is used to supply power to the main control circuit, the thermocouple circuit, the relay drive circuit, and the MOSFET tube drive circuit.

[0042] The steam oven control system of the present invention is used to control the steam oven to work in four different working modes, namely, steam mode, dry baking mode, steam baking mode, and center temperature mode. In actual use, the corresponding working mode is selected according to the cooking requirements of different foods. For example, for foods that are relatively easy to cook (such as egg tarts, chicken wings, etc.), the dry baking mode will be selected. In this mode, the temperature is between 30°C and 250°C, and the electric heating element and the fan need to work at the same time; if rice is to be steamed, the steam mode is selected. In this mode, the temperature is between 30°C and 105°C. At this time, the electric heating element is heated, the fan rotates, the water inlet solenoid valve is opened, and water flows to the electric heating element to be heated to generate water vapor that enters the steam oven, so that the food can be steamed and cooked; the steam baking mode is similar to the steaming mode. Similar, that is, in this mode, the electric heating element heats up, the fan rotates, the water inlet solenoid valve opens, and water flows to the electric heating element to be heated to generate water vapor that enters the steam oven, but the water inlet solenoid valve is open for a shorter time than in the steam mode. In the steam-bake mode, the temperature is between 30°C and 250°C; the core temperature mode is in any of the three working modes, namely the steam mode, dry-bake mode, and steam-bake mode. In view of the fact that the inside of the food is not easy to cook, in addition to placing temperature probes at different positions inside the steam oven, temperature probes are also inserted inside the food. The temperature of the temperature probe inside the food is controlled to heat the inside of the food, and the temperature is controlled between 42°C and 72°C. In the core temperature mode, the electric heating element heats up, the fan rotates, and the water inlet solenoid valve is opened or closed.

[0043] In order to control the steam oven to work in the above four different working modes, the present invention connects the output end of the MOSFET tube driving circuit to the coil of the relay SSR1, the relay SSR1 is connected in series with the electric heating element, and the coil of the relay SSR1 is controlled to be energized or de-energized through the main control circuit. When the coil of the relay SSR1 is energized, the electric heating element is energized to start heating, and the heat generated is conducted to the air in the steam oven, thereby heating the food. When the coil of the relay SSR1 is de-energized, the electric heating element is powered off and stops working, and no longer generates heat. The output end of the MOSFET tube driving circuit is also connected to the water inlet solenoid valve YV1, and the water inlet solenoid valve YV1 is controlled to be energized or de-energized through the main control circuit. When the water inlet solenoid valve YV1 is energized, the water The water will flow to the electric heating element. If the electric heating element is in a heating state, the water will be heated to generate steam and enter the steam oven. By placing temperature probes at different positions in the steam oven, the temperature probes are connected to the thermocouple circuit. The main control circuit is used to control the thermocouple circuit to select temperature probes at different positions and transmit the temperature of the temperature probes to the main control circuit. When the temperature is too high or too low, the temperature is controlled within the set range by reducing or increasing the heating power of the electric heating element. The fan is connected to the output end of the relay drive circuit, and the relay drive circuit is controlled by the main control circuit to control the start and stop of the fan M. When the fan is working, it can circulate the hot air evenly to the steam oven, so that the food is heated evenly and the cooking effect of the food is improved.

[0044] like Figure 4As shown, the main control circuit includes a chip U1, which is a microcontroller of model CH32V307VCT6. The first pin of the chip U1 is connected to the sixth pin of the chip U13 in the relay drive circuit, the second pin of the chip U1 is connected to the fifth pin of the chip U13, the third pin of the chip U1 is connected to the fourth pin of the chip U13, the fourth pin of the chip U1 is connected to the third pin of the chip U13, the fifth pin of the chip U1 is connected to the second pin of the chip U13, the sixth pin of the chip U1 is connected in series with the capacitor C2 and then connected to ground, the tenth pin of the chip U1 is connected in series with the capacitor C3 and then connected to the tenth pin of the chip U1 The eleventh pin of chip U1 is grounded, the tenth pin of chip U1 is connected to 3.3V voltage, the nineteenth pin and the twentieth pin of chip U1 are both grounded, the twenty-first pin of chip U1 is connected in series with capacitor C20 and then grounded, the twenty-first pin of chip U1 is connected to 3.3V voltage, the twenty-second pin of chip U1 is connected in series with capacitor C4 and then grounded, the twenty-seventh pin of chip U1 is grounded, the twenty-eighth pin of chip U1 is connected in series with capacitor C10 and then grounded, the twenty-eighth pin of chip U1 is connected to 3.3V voltage, the twenty-ninth pin of chip U1 is connected to the sixth pin of chip U8 in the thermocouple circuit, and chip U1 The 30th pin of chip U1 is connected to the 5th pin of chip U8 in the thermocouple circuit, the 31st pin of chip U1 is connected to the 7th pin of chip U8 in the thermocouple circuit, the 38th pin of chip U1 is connected to the 1st pin of chip U13 in the relay drive circuit, the 49th pin of chip U1 is connected in series with capacitor C17 and then connected to the 50th pin of chip U1, the 49th pin of chip U1 is grounded, the 50th pin of chip U1 is connected to 3.3V voltage, the 55th pin of chip U1 is connected to the 8th pin of chip U6 in the MOSFET tube drive circuit, the 56th pin of chip U1 is connected to the The seventh pin, the fifty-seventh pin of chip U1 is connected to the sixth pin of chip U6, the fifty-eighth pin of chip U1 is connected to the fifth pin of chip U6, the fifty-ninth pin of chip U1 is connected to the fourth pin of chip U6, the sixtieth pin of chip U1 is connected to the third pin of chip U6, the sixty-first pin of chip U1 is connected to the second pin of chip U6, the sixty-second pin of chip U1 is connected to the first pin of chip U6, the seventy-fourth pin of chip U1 is connected in series with capacitor C9 and then connected to the seventy-fifth pin of chip U1, the seventy-fourth pin of chip U1 is grounded, and the seventy-fifth pin of chip U1 is connected to 3.3V voltage, the 81st pin of chip U1 is connected to the 9th pin of chip U3 and the 9th pin of chip U4 in the thermocouple circuit, the 82nd pin of chip U1 is connected to the 10th pin of chip U3 and the 10th pin of chip U4 in the thermocouple circuit, the 83rd pin of chip U1 is connected to the 11th pin of chip U3 and the 11th pin of chip U4 in the thermocouple circuit, the 97th pin of chip U1 is connected to the 8th pin of chip U13 in the relay drive circuit, the 98th pin of chip U1 is connected to the 7th pin of chip U13 in the relay drive circuit, the 99th pin of chip U1 is connected in series with capacitor C1 and then connected to the 100th pin of chip U1, the 99th pin of chip U1 is grounded, and the 100th pin of chip U1 is connected to 3.3V voltage. .

[0045] The present invention adopts a microcontroller of model CH32V307VCT6 in the main control circuit. The microcontroller of this model has reliable and stable performance, strong scalability, high-speed computing capability and data processing capability. The chip U1 controls the thermocouple circuit, the relay drive circuit and the MOSFET tube drive circuit respectively, and can monitor the internal temperature and humidity in real time. By controlling the heating of the electric heating element, the start and stop of the fan and whether to add water to the electric heating element to generate steam, the internal temperature, humidity, time and other parameters of the steam oven can be accurately controlled, so that it can be automatically adjusted according to different foods and cooking requirements, making cooking safer and smarter. Since it can be controlled according to the temperature and time required by the food, it can avoid energy waste, reduce cooking time and improve cooking efficiency.

[0046] like Figure 5-10 As shown, the main control circuit also includes a reset circuit, a crystal oscillator circuit, a download and operation indication circuit, a current detection interface circuit, a voltage detection interface circuit, and an I / O lead interface circuit. Figure 5 The reset circuit includes a resistor R3, a capacitor C14, and a switch SW2. One end of the capacitor C14 is connected to one end of the resistor R3, one end of the switch SW2, and the fourteenth pin of the chip U1. The other end of the capacitor C14 is connected to the other end of the switch SW2 and then grounded. The other end of the resistor R3 is connected to a 3.3V voltage. The model of the switch SW2 is TSA363G25-250B. When the switch SW2 is pressed, the microcontroller is reset.

[0047] See also Figure 6The crystal oscillator circuit includes a crystal oscillator X1, a crystal oscillator X2, a capacitor C11, a capacitor C12, a capacitor C13, and a capacitor C15. One end of the crystal oscillator X1 is connected to one end of the capacitor C11 and the twelfth pin of the chip U1, and the other end of the crystal oscillator X1 is connected to one end of the capacitor C12 and the thirteenth pin of the chip U1. The other end of the capacitor C11 is connected to the other end of the capacitor C12 and then grounded. One end of the crystal oscillator X2 is connected to one end of the capacitor C13 and the eighth pin of the chip U1, and the other end of the crystal oscillator X1 is connected to one end of the capacitor C15 and the ninth pin of the chip U1. The other end of the capacitor C13 is connected to the other end of the capacitor C15 and then grounded. The frequency of the crystal oscillator X1 is a high-frequency crystal oscillator of 8MHz, and the frequency of the crystal oscillator X2 is a low-frequency crystal oscillator of 32.768kHz. The circuit can provide a clock for the chip U1.

[0048] See also Figure 7 The download and operation indication circuit includes a switch SW3, a resistor R13, a resistor R15, a resistor R16, a power supply B1, a connector H5, a light emitting diode LED2, and a light emitting diode LED3. The model of the switch SW3 is DSIC021LSGET. The fourth pin of the switch SW3 is connected to a 3.3V power supply. The first pin of the switch SW3 is respectively connected to one end of the resistor R13 and the ninety-fourth pin of the chip U1. The second pin of the switch SW3 is respectively connected to one end of the resistor R14 and the thirty-seventh pin of the chip U1. The other end of the resistor R13 is connected to the other end of the resistor R14 and then grounded. One end of the resistor R15 is connected to the ground. Connected to the anode of the light-emitting diode LED2, the cathode of the light-emitting diode LED2 is connected to the 23rd pin of the chip U1, one end of the resistor R16 is connected to the anode of the light-emitting diode LED3, the cathode of the light-emitting diode LED3 is connected to the 24th pin of the chip U1, the other end of the resistor R15 is connected to the other end of the resistor R16 and then connected to a 3.3V voltage, the first pin of the connector H5 is connected to a 3.3V voltage, the second pin of the connector H5 is connected to the sixth pin of the chip U1, the third pin of the connector H5 is connected to the positive pole of the power supply B1, the negative pole of the power supply B1 is grounded, and the model of the power supply B1 is CR1220-2. When you need to download the program, just toggle 1 or 2 on the switch SW3. VBAT represents the dedicated pin for battery working mode in the circuit. Use a battery or other power supply to connect to the VBAT pin. When the power is off, the contents of the backup register can be saved and the RTC function can be maintained. If no external battery is used in the application, the VBAT pin should be connected to the VDD pin. Connect a button battery to B1. When there is a button battery, connect pins 2 and 3 of H5. When there is no button battery, connect pins 1 and 2 of H5.

[0049] See also Figure 8The current detection interface circuit includes a chip U77, the model of the chip U77 is B4B-XH-A(LF)(SN), the first pin of the chip U77 is connected to the thirty-fourth pin of the chip U1, the second pin of the chip U77 is connected to the thirty-third pin of the chip U1, the third pin of the chip U77 is connected to the eighteenth pin of the chip U1, and the fourth pin of the chip U77 is grounded. Fig. 9 The voltage detection interface circuit includes a chip U78, the model of the chip U78 is B4B-XH-A(LF)(SN), the first pin of the chip U78 is connected to the seventeenth pin of the chip U1, the second pin of the chip U78 is connected to the thirty-sixth pin of the chip U1, the third pin of the chip U78 is connected to the thirty-fifth pin of the chip U1, and the fourth pin of the chip U78 is grounded. Fig.10 The I / O lead interface circuit includes a chip H15, which is a connector of model PZ254V-11-04P. The first pin of the chip H15 is connected to the 95th pin of the chip U1, the second pin of the chip H15 is connected to the 91st pin of the chip U1, the third pin of the chip H15 is connected to the 90th pin of the chip U1, and the fourth pin of the chip H15 is connected to the 89th pin of the chip U1. This circuit is used to transmit data.

[0050] like Fig.11As shown, the thermocouple circuit is connected to multiple temperature probes, and the thermocouple circuit includes chip U3, chip U4, chip U8, resistor R66, and capacitor C29. The models of chip U3 and chip U4 are both CD4051BM / TR, and chip U8 is a temperature converter with model MAX6675ISA+T. The first pin of chip U3 and the first pin of chip U4 are respectively connected to the two ends of the fifth temperature probe, the second pin of chip U3 and the second pin of chip U4 are respectively connected to the two ends of the seventh temperature probe, the fourth pin of chip U3 and the fourth pin of chip U4 are respectively connected to the two ends of the eighth temperature probe, the fifth pin of chip U3 and the fifth pin of chip U4 are respectively connected to the two ends of the sixth temperature probe, the twelfth pin of chip U3 and the twelfth pin of chip U4 are respectively connected to the two ends of the fourth temperature probe, the thirteenth pin of chip U3 and the thirteenth pin of chip U4 are respectively connected to the two ends of the first temperature probe, the fourteenth pin of chip U3 and the fourteenth pin of chip U4 are respectively connected to the two ends of the second temperature probe, the fifteenth pin of chip U3 and the fifteenth pin of chip U4 are respectively connected to the two ends of the third temperature probe, and the third The pins are respectively connected to one end of the resistor R66 and the second pin of the chip U8, the other end of the resistor R66 is connected to the first pin of the chip U8 and then grounded, the third pin of the chip U4 is connected to the third pin of the chip U8, the sixth pin, the seventh pin and the eighth pin of the chip U3 are all grounded, the ninth pin of the chip U3 is connected to the eighty-first pin of the chip U1, the tenth pin of the chip U3 is connected to the eighty-second pin of the chip U1, the eleventh pin of the chip U3 is connected to the eighty-third pin of the chip U1, the third pin of the chip U4 is connected to the third pin of the chip U8, and the chip U4 The sixth, seventh and eighth pins of chip U4 are all grounded, the ninth pin of chip U4 is connected to the eighty-first pin of chip U1, the tenth pin of chip U4 is connected to the eighty-second pin of chip U1, the eleventh pin of chip U4 is connected to the eighty-third pin of chip U1, the fourth pin of chip U8 is connected in series with capacitor C29 and then grounded, the fourth pin is connected to a 3.3V voltage, the fifth pin of chip U8 is connected to the thirtieth pin of chip U1, the sixth pin of chip U8 is connected to the twenty-ninth pin of chip U1, and the seventh pin of chip U8 is connected to the thirty-first pin of chip U1.

[0051] In actual work, the number of temperature probes can be selected according to work needs. By placing multiple temperature probes at different positions in the steam oven, the temperature at multiple positions inside the steam oven can be monitored. For example, the fourth temperature probe of the present invention is a K-type thermocouple, which is placed near the heating element and is used to measure the oven cavity temperature of the steam oven. The first temperature probe is also a K-type thermocouple, which is placed near the condensation port and is used to measure the condensation temperature. In addition, four temperature probes are placed at different positions in the center of the steam oven to measure four temperatures. The minimum value of the four temperatures is taken as the center temperature of the steam oven.

[0052] In practical applications, the temperature probe is usually connected to the thermocouple circuit through a connector. For example, in this embodiment, the thermocouple circuit also includes chips U35-U38. The models of chips U35-U38 are all KF2EDGV-5.0-4P. Chips U35-U38 have four pins respectively, two by two in a group, and can connect eight temperature probes. The first pin and the second pin of chip U35 are respectively connected to the twelfth pin of chip U3 and the twelfth pin of chip U4. The third pin and the fourth pin of chip U35 are respectively connected to the thirteenth pin of chip U3 and the thirteenth pin of chip U4. The first pin and the second pin of chip U36 are respectively connected to the twelfth pin of chip U3 and the thirteenth pin of chip U4. The fourteenth pin of chip U3 and the fourteenth pin of chip U4, the third pin and the fourth pin of chip U36 are connected to the fifteenth pin of chip U3 and the fifteenth pin of chip U4 respectively, the first pin and the second pin of chip U37 are connected to the first pin of chip U3 and the first pin of chip U4 respectively, the third pin and the fourth pin of chip U37 are connected to the second pin of chip U3 and the second pin of chip U4 respectively, the first pin and the second pin of chip U38 are connected to the fourth pin of chip U3 and the fourth pin of chip U4 respectively, the third pin and the fourth pin of chip U38 are connected to the fifth pin of chip U3 and the fifth pin of chip U4 respectively. Figure 3 As shown, the first pin and the second pin of the chip U35 in the present invention are respectively connected to the two ends of the furnace temperature sensor TC1, the third pin and the fourth pin of the chip U35 are respectively connected to the two ends of the condensation temperature sensor TC2, and the four pins of the chip U36 and the chip U37 are all connected to the two ends of the intermediate temperature sensor TC3. The main control circuit sends signals to the ninth pin, the tenth pin, and the eleventh pin of the chip U3 and the chip U4 respectively to select the chip. For example, if it is 001, it means that A2, A1, and A0 are 0, 0, and 1. At this time, the third pin of the chip U3 and the chip U4 transmits the temperature of the Y1 channel, that is, the fourteenth pin (A2 / B2). The third pin of the chip U3 and the chip U4 transmits the value to the temperature converter MAX6675ISA+T for temperature conversion, converts the analog quantity into a digital quantity, communicates with the main control circuit through the serial port SPI1, and transmits the temperature to the main control circuit.

[0053] like Fig.12As shown, the relay driving circuit includes a chip U13, a resistor R11, a resistor R12, resistors R17-R22, light-emitting diodes LED12-LED19, and multiple relays. The model of chip U13 is ULN2803A. The first pin of chip U3 is connected to the thirty-eighth pin of chip U1, the second pin of chip U13 is connected to the fifth pin of chip U1, the third pin of chip U13 is connected to the fourth pin of chip U1, the fourth pin of chip U13 is connected to the third pin of chip U1, the fifth pin of chip U13 is connected to the second pin of chip U1, the sixth pin of chip U13 is connected to the first pin of chip U1, and the seventh pin of chip U13 is connected to the ninety-eighth pin of chip U1. The eighth pin of chip U13 is connected to the ninety-seventh pin of chip U1, the ninth pin of chip U13 is grounded, the tenth pin of chip U13 is connected to 5V voltage, the eleventh pin of chip U13 is respectively connected to one end of resistor R20 and one end of relay U57 coil, the other end of resistor R20 is connected to the cathode of light-emitting diode LED16, the anode of light-emitting diode LED16 is connected to the other end of relay U57 coil, the twelfth pin of chip U13 is respectively connected to one end of resistor R12 and one end of relay U58 coil, the other end of resistor R12 is connected to the cathode of light-emitting diode LED13, the anode of light-emitting diode LED13 is connected to the other end of relay U58 coil, The thirteenth pin is respectively connected to one end of the resistor R18 and one end of the coil of the relay U59, the other end of the resistor R18 is connected to the cathode of the light-emitting diode LED15, the anode of the light-emitting diode LED15 is connected to the other end of the coil of the relay U59, the fourteenth pin of the chip U13 is respectively connected to one end of the resistor R19 and one end of the coil of the relay U60, the other end of the resistor R19 is connected to the cathode of the light-emitting diode LED17, the anode of the light-emitting diode LED17 is connected to the other end of the coil of the relay U60, the fifteenth pin of the chip U13 is respectively connected to one end of the resistor R22 and one end of the coil of the relay U61, the other end of the resistor R22 is connected to the cathode of the light-emitting diode LED19, the light-emitting diode The anode of LED19 is connected to the other end of the coil of relay U61, the sixteenth pin of chip U13 is respectively connected to one end of resistor R21 and one end of the coil of relay U62, the other end of resistor R21 is connected to the cathode of light-emitting diode LED18, the anode of light-emitting diode LED18 is connected to the other end of the coil of relay U62, the seventeenth pin of chip U13 is respectively connected to one end of resistor R17 and one end of the coil of relay U63, the other end of resistor R17 is connected to the cathode of light-emitting diode LED14, the anode of light-emitting diode LED14 is connected to the other end of the coil of relay U63, the eighteenth pin of chip U13 is respectively connected to one end of resistor R11 and one end of the coil of relay U64,The other end of the resistor R11 is connected to the cathode of the light emitting diode LED12, and the anode of the light emitting diode LED12 is connected to the other end of the coil of the relay U64.

[0054] The chip ULN2803A is a monolithic integrated high-voltage, high-current Darlington array. The circuit contains eight independent Darlington drive channels. The circuit is designed with a freewheeling diode, which can be used to drive inductive loads such as relays and stepper motors. The collector of a single Darlington can output 500mA current, and connecting Darlingtons in parallel can achieve higher output current capabilities. This circuit can be widely used in relay drivers, lighting drivers, display drivers (LEDs), stepper motor drivers, and logic buffers. Each Darlington of ULN2803A is connected in series with a 2.7K base resistor, which can be directly connected to TTL / CMOS circuits at a 5V operating voltage, and can directly process data that originally required standard logic buffers to process.

[0055] The relay drive circuit can be connected to DC and AC loads, and the load current can be very large. Chip U1 controls the IN8-IN1 input pins of chip U13, and gives high / low level instructions to the 1-8 pins of chip U13 to control the corresponding 8 relays U57-U64 respectively. The present invention only uses the 4 relay control circuits of U59-U62, U59 is standby, U60 is equipped with a fan, U61 is equipped with a detergent pump 1, and U62 is equipped with a detergent pump 2. Figure 3 As shown, the first pin and the second pin of the chip U60 are connected to the two ends of the fan M, the first pin and the second pin of the chip U61 are connected to the two ends of the cleaning pump Y1, and the first pin and the second pin of the chip U62 are connected to the two ends of the cleaning pump Y2. When the microcontroller gives a high level to the control end corresponding to the relay U60, that is, the IN5 pin of the ULN2803A, through the program, the control of the relay can be realized. When the high level is received, the relay coil is energized, the circuit is connected, and the fan or detergent pump starts to work.

[0056] like Fig.13As shown, the MOSFET tube driving circuit includes chip U6, resistor R1, resistor R4, resistor R5-R9, resistor R81-R88, light-emitting diode LED4-LED11, field effect tube Q22-Q25, field effect tube Q33-Q36, chip U75, chip U76, the model of chip U6 is ULN2803A, the model of field effect tube Q22-Q25 and field effect tube Q33-Q36 are all PMV60ENEAR, the model of chip U75 and chip U76 are all DB125-2.54-8P-GN-S, the first pin of chip U6 is connected to the sixty-second pin of chip U1, the second pin of chip U6 is connected to the sixty-first pin of chip U1, and the third pin of chip U6 is connected to the sixty-second pin of chip U1. The pin of chip U6 is connected to the sixtieth pin of chip U1, the fourth pin of chip U6 is connected to the fifty-ninth pin of chip U1, the fifth pin of chip U6 is connected to the fifty-eighth pin of chip U1, the sixth pin of chip U6 is connected to the fifty-seventh pin of chip U1, the seventh pin of chip U6 is connected to the fifty-sixth pin of chip U1, the eighth pin of chip U6 is connected to the fifty-fifth pin of chip U1, the ninth pin of chip U6 is grounded, the tenth pin of chip U6 is respectively connected to the 5V voltage and one end of resistors R81-R88, the eleventh pin to the eighteenth pin of chip U6 are respectively connected to the other end of resistors R81-R88, the eleventh pin of chip U6 is respectively connected to one end of resistor R4 and the gate of field effect transistor Q22, The twelfth pin of the chip U6 is respectively connected to one end of the resistor R6 and the gate of the field effect transistor Q23, the thirteenth pin of the chip U6 is respectively connected to one end of the resistor R8 and the gate of the field effect transistor Q24, the fourteenth pin of the chip U6 is respectively connected to one end of the resistor R10 and the gate of the field effect transistor Q25, the fifteenth pin of the chip U6 is respectively connected to one end of the resistor R1 and the gate of the field effect transistor Q33, the sixteenth pin of the chip U6 is respectively connected to one end of the resistor R5 and the gate of the field effect transistor Q34, the seventeenth pin of the chip U6 is respectively connected to one end of the resistor R7 and the gate of the field effect transistor Q35, the eighteenth pin of the chip U6 is respectively connected to one end of the resistor R9 and the gate of the field effect transistor Q36, and the other end of the resistor R4 is connected to The anode of the light-emitting diode LED5 is connected to the cathode of the light-emitting diode LED5, which is connected to the source of the field effect transistor Q22 and then grounded. The drain of the field effect transistor Q22 is connected to the first pin of the chip U75. The other end of the resistor R6 is connected to the anode of the light-emitting diode LED7, the cathode of the light-emitting diode LED7 is connected to the source of the field effect transistor Q23 and then grounded. The drain of the field effect transistor Q23 is connected to the third pin of the chip U75. The other end of the resistor R8 is connected to the anode of the light-emitting diode LED9, the cathode of the light-emitting diode LED9 is connected to the source of the field effect transistor Q24 and then grounded. The drain of the field effect transistor Q24 is connected to the fifth pin of the chip U75. The other end of the resistor R10 is connected to the anode of the light-emitting diode LED11.The cathode of the light-emitting diode LED11 is connected to the source of the field effect transistor Q25 and then grounded, the drain of the field effect transistor Q25 is connected to the seventh pin of the chip U75, the other end of the resistor R1 is connected to the anode of the light-emitting diode LED4, the cathode of the light-emitting diode LED4 is connected to the source of the field effect transistor Q33 and then grounded, the drain of the field effect transistor Q33 is connected to the first pin of the chip U76, the other end of the resistor R5 is connected to the anode of the light-emitting diode LED6, the cathode of the light-emitting diode LED6 is connected to the source of the field effect transistor Q34 and then grounded, the drain of the field effect transistor Q34 is connected to the third pin of the chip U76, and the other end of the resistor R7 is connected to the anode of the light-emitting diode LED6 and the cathode of the light-emitting diode LED6 is connected to the source of the field effect transistor Q34 and then grounded. One end is connected to the anode of the light-emitting diode LED8, the cathode of the light-emitting diode LED8 is connected to the source of the field effect tube Q35 and then grounded, the drain of the field effect tube Q35 is connected to the fifth pin of the chip U76, the other end of the resistor R9 is connected to the anode of the light-emitting diode LED10, the cathode of the light-emitting diode LED10 is connected to the source of the field effect tube Q36 and then grounded, the drain of the field effect tube Q36 is connected to the seventh pin of the chip U76, the second pin, the fourth pin, the sixth pin, and the eighth pin of the chip U75 are connected to the 24V voltage, and the second pin, the fourth pin, the sixth pin, and the eighth pin of the chip U76 are connected to the 24V voltage.

[0057] MOSFET control is realized by connecting 8 groups of N-channel field effect tube circuits through chip U6. The drains of the 8 field effect tubes are connected to 2 groups of connectors (U75, U76). Each connector has 8 pins, two by two (one group is connected to the +24V power supply through the PCB board, and the other group is also connected to the gate of the eight groups of field effect tube circuits Q36-Q22). The load circuit is connected and turned on and off by program control. In practical applications, the controlled object can be connected to two connectors as needed, such as Figure 3As shown, the first and second pins of chip U75 are respectively connected to the two ends of the condensing valve-double-headed solenoid valve YV2-2, the fifth pin of chip U75 is connected to one end of the heater-temperature limiter B1, the other end of the heater-temperature limiter B1 is connected to one end of the solid-state relay SSR1, the other end of the solid-state relay SSR1 is connected to the sixth pin of chip U75, the seventh pin of chip U75 is connected to the anode of diode D1, the cathode of diode D1 is connected to one end of the dehumidification valve-DC reduction motor M2, the other end of the dehumidification valve-DC reduction motor M2 is connected to the eighth pin of chip U75, the third and fourth pins of chip U76 are connected to the two ends of the water inlet solenoid valve YV1, and the fifth and sixth pins of chip U76 are respectively connected to the two ends of the double-headed solenoid valve YV2-1. The loads connected to the chip U75 of the present invention are: condensation valve - double-headed solenoid valve YV2-2 (connected to pins 1 and 2); heater - temperature limiter B1, coil of solid-state relay SSR1 (connected to pins 5 and 6); dehumidification valve - DC reduction motor M2 (connected to pins 7 and 8); a total of 3 loads. The loads connected to the chip U76 are: cleaning - double-headed solenoid valve YV2-1 (connected to pins 5 and 6); water inlet solenoid valve YV1 (connected to pins 7 and 8), a total of 2 groups of loads, and other pins are reserved. By giving a high level to the 61st pin of the chip U1 connected to the input terminal IN2 of the chip U6 through the program, the field effect tube Q35 is turned on, and the double-headed solenoid valve YV2-1 loaded by the 5th and 6th pins in the chip U76 is energized and starts to work, and the steam oven is drained for cleaning.

[0058] like Fig.14 As shown, the steam oven control system of the present invention also includes various interface circuits, namely, a debugging serial port circuit, a SWD&UART port circuit, a USB interface circuit, a NORFLASH interface circuit, a dehumidifying valve switch interface circuit, a door switch detection circuit, a water inlet pump pressure detection circuit, a washing pump pressure switch detection circuit, a serial port screen interface circuit, and a serial port interface circuit. The debugging serial port circuit is an interface circuit used to transmit the operating status of the device, and can also be used to burn programs, including a chip H13, the first pin of the chip H13 is grounded, the second pin is connected to the 68th pin of the chip U1, the third pin is connected to the 69th pin of the chip U1, and the fourth pin is connected to a 3.3V voltage. The SWD&UART port circuit is used to download programs, including a chip U12, the first pin of the chip U12 is grounded, the second pin is connected to the 76th pin of the chip U1, and the third pin is connected to the 72nd pin of the chip U1.

[0059] The USB interface circuit includes chip USB2, diode D5, and diode D6. The model of chip USB2 is USB-226-BRW. The first pin of chip USB2 is grounded, the second pin is connected to the cathode of diode D6 and the 70th pin of chip U1, the anode of diode D6 is grounded, the third pin is connected to the cathode of diode 5 and the 71st pin of chip U1, the fourth pin is connected to the anode of diode D5 and then grounded, and the fifth to eighth pins are grounded. This circuit is used for log export and menu import interface circuit, such as operation history or fault code. The NORFLASH interface circuit provides 8M flash memory for storing logs or menus, including chip U27. The model of chip U27 is W25Q64JVSSIQ. The first pin of chip U27 is connected to the 51st pin of chip U1, the second pin of chip U27 is connected to the 53rd pin of chip U1, the fifth pin of chip U27 is connected to the 54th pin of chip U1, the sixth pin of chip U27 is connected to the 52nd pin of chip U1, the seventh pin of chip U27 is connected to the eighth pin and then connected to a 3.3V voltage and one end of capacitor C23, and the other end of capacitor C23 is grounded.

[0060] The dehumidifying valve switch interface circuit includes a light-emitting diode LED22, a resistor R27, a capacitor C25, a diode D7, and a port CN2. The first pin of the port CN2 is respectively connected to one end of the resistor R27, one end of the capacitor C25, the cathode of the diode D7, and the 88th pin of the chip U1. The other end of the resistor R27 is connected to the cathode of the light-emitting diode LED22. The anode of the light-emitting diode LED22 is connected to a 3.3V voltage. The anode of the diode D7 is connected to the other end of the capacitor C25 and then connected to the second pin of the port CN2 and grounded. The door switch detection circuit includes a light-emitting diode LED23, a resistor R28, a capacitor C26, a diode D8, and a port CN3. The first pin of the port CN3 is respectively connected to one end of the resistor R28, one end of the capacitor C26, the cathode of the diode D8, and the 85th pin of the chip U1. The other end of the resistor R28 is connected to the cathode of the light-emitting diode LED23. The anode of the light-emitting diode LED23 is connected to a 3.3V voltage. The anode of the diode D8 is connected to the other end of the capacitor C26 and then connected to the second pin of the port CN3 and grounded.

[0061] The water inlet pump pressure detection circuit includes a light-emitting diode LED21, a resistor R29, a capacitor C27, a diode D9, and a port CN4. The first pin of the port CN4 is respectively connected to one end of the resistor R29, one end of the capacitor C27, the cathode of the diode D9, and the 86th pin of the chip U1. The other end of the resistor R29 is connected to the cathode of the light-emitting diode LED21. The anode of the light-emitting diode LED21 is connected to a 3.3V voltage. The anode of the diode D9 is connected to the other end of the capacitor C27 and then connected to the second pin of the port CN4 and grounded. The washing pump pressure switch detection circuit includes a light-emitting diode LED20, a resistor R30, a capacitor C28, a diode D10, and a port CN5. The first pin of the port CN5 is respectively connected to one end of the resistor R30, one end of the capacitor C28, the cathode of the diode D10, and the 87th pin of the chip U1. The other end of the resistor R30 is connected to the cathode of the light-emitting diode LED20. The anode of the light-emitting diode LED20 is connected to a 3.3V voltage. The anode of the diode D10 is connected to the other end of the capacitor C28 and then connected to the second pin of the port CN5 and grounded.

[0062] The serial port screen interface circuit includes chip U55, the model of chip U55 is KF2EDGV-5.0-4P, the first pin of chip U55 is grounded, the second pin is connected to the 25th pin of chip U1, the third pin is connected to the 26th pin of chip U1, and the fourth pin is connected to 12V voltage. The serial port interface circuit includes chip U79, the model of chip U79 is KF2EDGV-5.0-4P, the first pin of chip U79 is connected to 12V voltage, the second pin is connected to the 78th pin of chip U1, the third pin is connected to the 79th pin of chip U1, and the fourth pin is grounded.

[0063] See also Figure 3 The first pin and the second pin of port CN2 are respectively connected to the two ends of switch S4, the first pin and the second pin of port CN3 are respectively connected to the two ends of switch S1, the first pin and the second pin of port CN4 are respectively connected to the two ends of switch S2, and the first pin and the second pin of port CN5 are respectively connected to the two ends of switch S3.

[0064] like Fig.15As shown, the steam oven control system of the present invention also includes an RJ45 network port circuit, the RJ45 network port circuit includes a network port chip J1, resistors R70-R72, resistors R89-R92, capacitors C110, and capacitors C116, the sixth pin of the network port chip J1 is connected in series with the resistor R89 ​​and then connected to the sixty-fourth pin of the chip U1, the third pin of the network port chip J1 is connected in series with the resistor R90 and then connected to the sixty-third pin of the chip U1, the second pin of the network port chip J1 is connected in series with the resistor R91 and then connected to the sixty-sixth pin of the chip U1 Pins, the first pin of the network port chip J1 is connected in series with the resistor R92 and then connected to the sixty-fifth pin of the chip U1, the fourth pin of the network port chip J1 is connected to the fifth pin and then connected to a 3.3V voltage, and connected in series with the capacitor C110 and then grounded, the ninth pin of the network port chip J1 is connected in series with the resistor R70 and then connected to a 3.3V voltage, the twelfth pin is connected in series with the resistor R71 and then connected to a 3.3V voltage, the eleventh pin of the network port chip J1 is connected to the fifteenth pin of the chip U1, and the tenth pin of the network port chip J1 is connected to the sixteenth pin of the chip U1. It is used for centralized control when multiple devices are running to ensure the smooth operation of each communication interface.

[0065] like Fig.16 and Fig.17 As shown, the power supply circuit includes a 5V to 3.3V power supply conversion circuit and a 24V to 12V power supply conversion circuit. The 5V to 3.3V power supply conversion circuit includes a chip U2, capacitors C5-C8, a resistor R2, and a light-emitting diode LED1. The model of chip U2 is AMS1117-3.3. The first pins of chip U2 are respectively connected to one end of capacitors C5-C8, the cathode of light-emitting diode LED1, the second pin of pin P1 and grounded. The second pins of chip U2 are respectively connected to the fourth pin of chip U2, the other end of capacitor C7, the other end of capacitor C8, and one end of resistor R2 and output a 3.3V voltage. The other end of resistor R2 is connected to the anode of light-emitting diode LED1. The third pins of chip U2 are respectively connected to the other end of capacitor C5, the other end of capacitor C6, the first pin of pin P1 and connected to the input 5V voltage.

[0066] The 24V to 12V power conversion circuit includes a chip U5, a transformer L2, a capacitor C16, a capacitor C18, a capacitor C19, a capacitor C21, a capacitor C22, a capacitor CY1, and a capacitor CY2. The model of the chip U5 is VRB2412S-6WR3. The first pin of the chip U5 is respectively connected to the secondary side opposite-name end of the transformer L2, one end of the capacitor C19, one end of the capacitor C21, and one end of the capacitor CY2. The second pin of the chip U5 is respectively connected to the primary side opposite-name end of the transformer L2, the other end of the capacitor C19, the other end of the capacitor C21, and one end of the capacitor CY1. The sixth pin of U5 is respectively connected to the other end of capacitor CY1, one end of capacitor C16, and the second pin of pin P3 and outputs a 12V voltage. The seventh pin of chip U5 is respectively connected to the other end of capacitor CY2, the other end of capacitor C167 and grounded. The primary side of transformer L2 has the same-name ends respectively connected to one end of capacitor C18, one end of capacitor C22, the first pin of pin P2, and the first pin of pin P3 and connected to the input 24V voltage. The secondary side of transformer L2 has the same-name ends respectively connected to the other end of capacitor C18, the other end of capacitor C22, the second pin of pin P1 and grounded.

[0067] Through pin P1, the chip U2 converts the external +5V power supply into +3.3V, providing stable power supply to each module in the circuit. Through pin P2, the transformer L2 and the DC module chip U5 convert the external +24V power supply into 12V for the serial screen interface circuit (chip U55). The P3 pin can also lead out the +24V power supply, which can provide stable power supply to each module in the circuit.

[0068] The modular design of the steam oven control system of the present invention can divide the multifunctional steam oven control system into multiple relatively independent modules. The modular design can conveniently expand the functions and performance of the system. Only by adding or replacing the corresponding modules can the functions be upgraded and expanded, thereby improving the scalability and flexibility of the system. The modular design can improve the reliability and stability of the system. Each module can operate independently and back up each other, thereby reducing the possibility of system failure and improving the reliability and stability of the product. The modular design can make the maintenance of the system more convenient and quick. Only the problematic modules need to be inspected or replaced without inspecting or replacing the entire system, thereby reducing maintenance time and cost. The modular design can reduce the manufacturing cost of the system, because each module can be independently designed and produced, and mass production and standardized production can be realized, thereby further reducing the manufacturing cost. The control system of the present invention has a clear structure, high reliability, and is easy to expand and maintain.

[0069] Working principle: Take the steaming and baking mode as an example. Figure 2 and Figure 3 The control process of the steam oven control system of the present invention is introduced. Figure 2 and Figure 3 All of them are electrical schematic diagrams of steam ovens. The electric heating element EH1 is connected in series with the relay SSR1 and then connected to 380V AC through the circuit breaker QF1. The first port of the toroidal transformer T1 is connected in series with the fuse FU2 and then connected to the circuit breaker QF1. The second port of the toroidal transformer T1 is connected in series with the fuse FU1 and then connected to the circuit breaker QF1. The third port of the toroidal transformer T1 is respectively connected to one end of the lighted button SB1 and the dual-output switching power supply U1. The fourth port of the toroidal transformer T1 is respectively connected to one end of the fuse FU3, and the other end of the fuse FU3 is respectively connected to the lighted button S One end of B1, one end of the fan M, and the other end of the lighted button SB1 are connected to the dual-output switching power supply U1. Fan M5 and fan M6 are both small cooling fans for dissipating heat inside the steam oven. One end of fan M5 is connected to one end of fan M6 and then connected in series with fuse FU4 and then connected to the positive pole of the dual-output switching power supply U1. The other end of fan M5 is connected to the other end of fan M6 and then connected to the negative pole of the dual-output switching power supply U1. One end of lamp H1 is connected in series with fuse FU4 and then connected to the positive pole of the dual-output switching power supply U1. The other end of lamp H1 is connected to the negative pole of the dual-output switching power supply U1.

[0070] When the circuit breaker QF1 is turned on, press the lighted button SB1, the indicator light and the display screen will light up, select the steaming mode on the display screen, and set the target temperature and steaming time. The display screen feeds back to the chip U1 through the interface circuit. The chip U1 controls the MOSFET tube drive circuit by giving high and low levels to the chip U6, thereby controlling the coil of the relay SSR1 to be energized or de-energized. The coil of the relay SSR1 is energized, the relay SSR1 is turned on, and the electric heating element starts to heat. The electric heating element of the present invention uses a heating tube. The chip U1 controls the on and off of the relay U60 by giving high and low levels to the chip U13, thereby controlling the operation of the fan M. In the steaming mode, the fan M is always in operation. The relay U60 of the present invention is connected to the fan M. When the relay U60 is turned on, the coil is energized, the normally closed contact of the relay is disconnected, and the normally open contact is closed. Figure 2 The circuit where the blower is located is connected, and the blower starts. The temperature of the temperature probes placed at different positions inside the steam oven is collected through the thermocouple circuit. The present invention places a temperature sensor near the electric heating element for real-time collection of the internal temperature of the steam oven, places a temperature sensor near the condensation port for real-time collection of the condenser temperature, and places four temperature sensors at the center of the steam oven to collect the center temperature at the same time. Chip U1 assigns values ​​to chip U3 and chip U4, selects the corresponding temperature sensor, and the analog value transmitted by the selected temperature sensor is converted into a digital value by chip U8 and transmitted to chip U1, and the temperature can be displayed on the display.

[0071] When the heating temperature reaches the set value, the chip U1 receives a signal to control the MOSFET tube drive circuit, control the coil of the relay SSR1 to lose power, the relay SSR1 is disconnected, and the electric heating element stops heating. When the collected temperature is lower than the target value, the electric heating element is controlled to start heating in the same way. Steam is required in the steaming mode. The steam is generated by injecting water into the heating tube. The heating tube is heated for about 30 seconds. The chip U1 sets the third pin of the MOSFET tube drive circuit, the water inlet solenoid valve YV1 is turned on, and the water inlet pipe sprays water to the heating tube to generate steam. After 12 seconds, the chip U1 sets the third pin of the MOSFET tube drive circuit to zero, the water inlet solenoid valve YV1 is disconnected, and the water inlet pipe stops spraying water for 30 seconds, and it is intermittent (spraying water for 12 seconds and stopping spraying water for 30 seconds).

[0072] like Fig.18 As shown, when actually operating the steam oven of the present invention, first turn on the machine and self-check whether there is any fault. If there is a fault, the fault code and information are displayed, then the power is turned off, and the fault is handled after stopping. If there is no fault in the self-check, check whether there is a water shortage. If there is a water shortage, the system prompts to add water and then make a predicted judgment. If there is no water shortage, directly judge whether to preheat. If preheating is required, set the preheating temperature, close the door of the steam oven, start the fan, and heat the heater. After the preheating time is up, stop heating and go to the step of setting the heating temperature, humidity, and time. If preheating is not required, directly go to the step of setting the heating temperature, humidity, and time, place the food tray and close the door, and start the fan, heater, water pump, etc.

[0073] Example 2

[0074] The present embodiment provides a method for controlling a steam oven. The main control circuit inputs a control signal to a MOSFET tube drive circuit, the coil of the relay SSR1 is energized, the electric heating element starts to heat, the thermocouple circuit collects the temperatures of multiple temperature probes in the steam oven in real time, the main control circuit inputs a control signal to the relay drive circuit, the fan M runs, and the working mode is selected. When the working mode is the steam mode or the steam-bake mode, the main control circuit receives the temperature of the temperature probe. When the temperature is too high or too low, the main control circuit inputs a control signal to the MOSFET tube drive circuit, the coil of the relay SSR1 is de-energized or energized to adjust the temperature. The main control circuit inputs a control signal to the MOSFET tube drive circuit, the water inlet solenoid valve YV1 is energized, and steam is generated. When the working mode is the dry-bake mode, the main control circuit inputs a control signal to the MOSFET tube drive circuit, the water inlet solenoid valve YV1 is de-energized, and no steam is generated. When the working mode is the core temperature mode, several temperature probes are inserted into the food, and the main control circuit adjusts the temperature according to the received temperatures.

[0075] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steam oven control system, characterized in that: It includes a main control circuit, a thermocouple circuit, a relay drive circuit, a MOSFET tube drive circuit, and a power supply circuit. The thermocouple circuit is connected to a plurality of temperature probes, which are located at different positions in the steam oven. The main control circuit is connected to the thermocouple circuit, and is used to control the thermocouple circuit to select the temperature probe, and transmit the temperature of the temperature probe to the main control circuit. The output end of the relay drive circuit is connected to the fan M, and the main control circuit is connected to the input end of the relay drive circuit, and is used to control the start and stop of the fan M, which is located on the steam oven. The output end of the MOSFET tube drive circuit is connected to the coil of the relay SSR1 and the water inlet electromagnetic valve YV1, and the main control circuit is connected to the input end of the MOSFET tube drive circuit, and is used to control the coil of the relay SSR1 and the water inlet electromagnetic valve YV1 to be energized or de-energized. The relay SSR1 is connected in series with the electric heating element, which is located inside the steam oven, and the water inlet electromagnetic valve YV1 is located on the steam oven. The power supply circuit is used to supply power to the main control circuit, the thermocouple circuit, the relay drive circuit, and the MOSFET tube drive circuit.

2. The steam oven control system according to claim 1, characterized in that: The main control circuit includes a chip U1, wherein the first pin, the second pin, the third pin, the fourth pin, the fifth pin, the thirty-eighth pin, the ninety-seventh pin and the ninety-eighth pin of the chip U1 are connected to the relay drive circuit, the sixth pin of the chip U1 is connected in series with the capacitor C2 and then to ground, the tenth pin of the chip U1 is connected in series with the capacitor C3 and then to the eleventh pin of the chip U1, the twenty-first pin of the chip U1 is connected in series with the capacitor C20 and then to ground, the twenty-second pin of the chip U1 is connected in series with the capacitor C4 and then to ground, the twenty-eighth pin of the chip U1 is connected in series with the capacitor C10 and then to ground, the twenty-ninth pin, the thirtieth pin and the thirty-first pin of the chip U1 are connected to the thermocouple circuit, the forty-ninth pin of the chip U1 is connected in series with the capacitor C17 and then to the fiftieth pin of the chip U1, the forty-ninth pin of the chip U1 is connected in series with the capacitor C18 and then to ground Pin 55 to pin 62 are connected to the MOSFET tube drive circuit, pin 74 of chip U1 is connected in series with capacitor C9 and then connected to pin 75 of chip U1, pin 81 of chip U1 is connected to pin 9 of chip U3 and pin 9 of chip U4 in the thermocouple circuit, pin 82 and pin 83 of chip U1 are connected to the thermocouple circuit, pin 99 of chip U1 is connected in series with capacitor C1 and then connected to pin 100 of chip U1, pin 10, pin 19, pin 20, pin 27, pin 49, pin 74 and pin 99 of chip U1 are all grounded, pin 11, pin 21, pin 28, pin 50, pin 75 and pin 100 of chip U1 are all connected to 3.3V voltage.

3. The steam oven control system according to claim 2, characterized in that: The thermocouple circuit includes a chip U3, a chip U4, a chip U8, a resistor R66, and a capacitor C29. The first pin of the chip U3 and the first pin of the chip U4 are respectively connected to the two ends of the fifth temperature probe, the second pin of the chip U3 and the second pin of the chip U4 are respectively connected to the two ends of the seventh temperature probe, the fourth pin of the chip U3 and the fourth pin of the chip U4 are respectively connected to the two ends of the eighth temperature probe, the fifth pin of the chip U3 and the fifth pin of the chip U4 are respectively connected to the two ends of the sixth temperature probe, the twelfth pin of the chip U3 and the twelfth pin of the chip U4 are respectively connected to the two ends of the fourth temperature probe, the thirteenth pin of the chip U3 and the thirteenth pin of the chip U4 are respectively connected to the two ends of the first temperature probe, the fourteenth pin of the chip U3 and the fourteenth pin of the chip U4 are respectively connected to the two ends of the second temperature probe, the fifteenth pin of the chip U3 and the fifteenth pin of the chip U4 are respectively connected to the two ends of the third temperature probe, the third pin of the chip U3 is respectively connected to one end of the resistor R66 and the second pin of the chip U8, the other end of the resistor R66 The end is connected to the first pin of chip U8 and then grounded, the third pin of chip U4 is connected to the third pin of chip U8, the sixth pin, the seventh pin and the eighth pin of chip U3 are all grounded, the ninth pin of chip U3 is connected to the eighty-first pin of chip U1, the tenth pin of chip U3 is connected to the eighty-second pin of chip U1, the eleventh pin of chip U3 is connected to the eighty-third pin of chip U1, the third pin of chip U4 is connected to the third pin of chip U8, the sixth pin, the seventh pin and the eighth pin of chip U4 are all grounded, the ninth pin of chip U4 is connected to the eighty-first pin of chip U1, the tenth pin of chip U4 is connected to the eighty-second pin of chip U1, the eleventh pin of chip U4 is connected to the eighty-third pin of chip U1, the fourth pin of chip U8 is connected in series with capacitor C29 and then grounded, the fourth pin is connected to 3.3V voltage, the fifth pin of chip U8 is connected to the thirtieth pin of chip U1, the sixth pin of chip U8 is connected to the twenty-ninth pin of chip U1, and the seventh pin of chip U8 is connected to the thirty-first pin of chip U1.

4. The steam oven control system according to claim 2, characterized in that: The relay driving circuit includes a chip U13, a resistor R11, a resistor R12, resistors R17-R22, a light emitting diode LED12-LED19, and a plurality of relays U57-U64. The first pin of the chip U3 is connected to the thirty-eighth pin of the chip U1, the second pin of the chip U13 is connected to the fifth pin of the chip U1, the third pin of the chip U13 is connected to the fourth pin of the chip U1, the fourth pin of the chip U13 is connected to the third pin of the chip U1, the fifth pin of the chip U13 is connected to the second pin of the chip U1, the sixth pin of the chip U13 is connected to the first pin of the chip U1, the seventh pin of the chip U13 is connected to the ninety-eighth pin of the chip U1, and the eighth pin of the chip U13 is connected to the The ninety-seventh pin of U1 and the ninth pin of chip U13 are grounded, the tenth pin of chip U13 is connected to 5V voltage, the eleventh pin of chip U13 is respectively connected to one end of resistor R20 and one end of relay U57 coil, the other end of resistor R20 is connected to the cathode of light-emitting diode LED16, the anode of light-emitting diode LED16 is connected to the other end of relay U57 coil, the twelfth pin of chip U13 is respectively connected to one end of resistor R12 and one end of relay U58 coil, the other end of resistor R12 is connected to the cathode of light-emitting diode LED13, the anode of light-emitting diode LED13 is connected to the other end of relay U58 coil, the thirteenth pin of chip U13 is respectively connected to one end of resistor R18 and relay One end of the coil of the electrical appliance U59 and the other end of the resistor R18 are connected to the cathode of the light-emitting diode LED15, and the anode of the light-emitting diode LED15 is connected to the other end of the coil of the relay U59. The fourteenth pin of the chip U13 is respectively connected to one end of the resistor R19 and one end of the coil of the relay U60. The other end of the resistor R19 is connected to the cathode of the light-emitting diode LED17, and the anode of the light-emitting diode LED17 is connected to the other end of the coil of the relay U60. The fifteenth pin of the chip U13 is respectively connected to one end of the resistor R22 and one end of the coil of the relay U61. The other end of the resistor R22 is connected to the cathode of the light-emitting diode LED19, and the anode of the light-emitting diode LED19 is connected to the other end of the coil of the relay U61. The sixteenth pin of the chip U13 is respectively connected to one end of the resistor R21 and one end of the coil of the relay U62, the other end of the resistor R21 is connected to the cathode of the light-emitting diode LED18, the anode of the light-emitting diode LED18 is connected to the other end of the coil of the relay U62, the seventeenth pin of the chip U13 is respectively connected to one end of the resistor R17 and one end of the coil of the relay U63, the other end of the resistor R17 is connected to the cathode of the light-emitting diode LED14, the anode of the light-emitting diode LED14 is connected to the other end of the coil of the relay U63, the eighteenth pin of the chip U13 is respectively connected to one end of the resistor R11 and one end of the coil of the relay U64, the other end of the resistor R11 is connected to the cathode of the light-emitting diode LED12,The anode of the light emitting diode LED12 is connected to the other end of the coil of the relay U64.

5. The steam oven control system according to claim 2, characterized in that: The MOSFET tube driving circuit includes a chip U6, a resistor R1, a resistor R4, resistors R5-R9, resistors R81-R88, light-emitting diodes LED4-LED11, field effect tubes Q22-Q25, field effect tubes Q33-Q36, a chip U75, and a chip U76. The first pin, the second pin, the third pin, the fourth pin, the fifth pin, the sixth pin, the seventh pin, and the eighth pin of the chip U6 are respectively connected to the sixty-second pin, the sixty-first pin, the sixtieth pin, the fifty-ninth pin, the fifty-eighth pin, the fifty-seventh pin, the fifty-sixth pin, and the fifty-fifth pin of the chip U1. The ninth pin of the chip U6 is grounded. The tenth pin of chip U6 is respectively connected to the 5V voltage and one end of resistors R81-R88, the eleventh pin to the eighteenth pin of chip U6 are respectively connected to the other end of resistors R81-R88, the eleventh pin of chip U6 is respectively connected to one end of resistor R4 and the gate of field effect transistor Q22, the twelfth pin of chip U6 is respectively connected to one end of resistor R6 and the gate of field effect transistor Q23, the thirteenth pin of chip U6 is respectively connected to one end of resistor R8 and the gate of field effect transistor Q24, the fourteenth pin of chip U6 is respectively connected to one end of resistor R10 and the gate of field effect transistor Q25, and the fifteenth pin of chip U6 is respectively connected to resistor R1 The sixteenth pin of chip U6 is connected to one end of resistor R5 and the gate of field effect transistor Q34 respectively. The seventeenth pin of chip U6 is connected to one end of resistor R7 and the gate of field effect transistor Q35 respectively. The eighteenth pin of chip U6 is connected to one end of resistor R9 and the gate of field effect transistor Q36 respectively. The cathode of light-emitting diode LED5 is connected to the source of field effect transistor Q22 and then to ground. The drain of field effect transistor Q22 is connected to the first pin of chip U75. The cathode of light-emitting diode LED7 is connected to the source of field effect transistor Q23 and then to ground. The drain of field effect transistor Q23 is connected to the third pin of chip U75. The cathode of the light-emitting diode LED9 is connected to the source of the field effect transistor Q24 and then grounded, the drain of the field effect transistor Q24 is connected to the fifth pin of the chip U75, the cathode of the light-emitting diode LED11 is connected to the source of the field effect transistor Q25 and then grounded, the drain of the field effect transistor Q25 is connected to the seventh pin of the chip U75, the cathode of the light-emitting diode LED4 is connected to the source of the field effect transistor Q33 and then grounded, the cathode of the light-emitting diode LED6 is connected to the source of the field effect transistor Q34 and then grounded, the cathode of the light-emitting diode LED8 is connected to the source of the field effect transistor Q35 and then grounded, the cathode of the light-emitting diode LED10 is connected to the source of the field effect transistor Q36 and then grounded,The other ends of resistors R4, R6, R8, R10, R1, R5, R7, and R9 are respectively connected to the anodes of light-emitting diodes LED5, LED7, LED9, LED11, LED4, LED6, LED8, and LED10, and the drains of field effect transistors Q33-Q36 are respectively connected to the first pin, the third pin, the fifth pin, and the seventh pin of chip U76.

6. The steam oven control system according to claim 2, characterized in that: The RJ45 network port circuit includes a network port chip J1, resistors R70-R72, resistors R89-R92, capacitors C110, and capacitors C116. The sixth pin of the network port chip J1 is connected in series with the resistor R89 ​​and then connected to the sixty-fourth pin of the chip U1. The third pin of the network port chip J1 is connected in series with the resistor R90 and then connected to the sixty-third pin of the chip U1. The second pin of the network port chip J1 is connected in series with the resistor R91 and then connected to the sixty-sixth pin of the chip U1. The first pin of the chip J1 is connected in series with the resistor R92 and then connected to the sixty-fifth pin of the chip U1. The fourth pin of the network port chip J1 is connected to the fifth pin and then connected to a 3.3V voltage, and is connected in series with the capacitor C110 and then grounded. The ninth pin of the network port chip J1 is connected in series with the resistor R70 and then connected to a 3.3V voltage. The twelfth pin is connected in series with the resistor R71 and then connected to a 3.3V voltage. The eleventh pin of the network port chip J1 is connected to the fifteenth pin of the chip U1, and the tenth pin of the network port chip J1 is connected to the sixteenth pin of the chip U1.

7. The steam oven control system according to claim 1, characterized in that: The power supply circuit includes a 5V to 3.3V power supply conversion circuit, which includes a chip U2, capacitors C5-C8, a resistor R2, and a light-emitting diode LED1. The model of chip U2 is AMS1117-3.

3. The first pin of chip U2 is respectively connected to one end of capacitors C5-C8, the cathode of light-emitting diode LED1, the second pin of pin P1 and grounded. The second pin of chip U2 is respectively connected to the fourth pin of chip U2, the other end of capacitor C7, the other end of capacitor C8, and one end of resistor R2 and outputs a 3.3V voltage. The other end of resistor R2 is connected to the anode of light-emitting diode LED1. The third pin of chip U2 is respectively connected to the other end of capacitor C5, the other end of capacitor C6, the first pin of pin P1 and connected to the input 5V voltage.

8. The steam oven control system according to claim 7, characterized in that: The power supply circuit also includes a 24V to 12V power supply conversion circuit, which includes a chip U5, a transformer L2, a capacitor C16, a capacitor C18, a capacitor C19, a capacitor C21, a capacitor C22, a capacitor CY1, and a capacitor CY2. The model of the chip U5 is VRB2412S-6WR3. The first pin of the chip U5 is respectively connected to the secondary side opposite-name end of the transformer L2, one end of the capacitor C19, one end of the capacitor C21, and one end of the capacitor CY2. The second pin of the chip U5 is respectively connected to the primary side opposite-name end of the transformer L2, the other end of the capacitor C19, and the other end of the capacitor C21. The sixth pin of chip U5 is respectively connected to the other end of capacitor CY1, one end of capacitor C16, and the second pin of pin P3 and outputs a 12V voltage. The seventh pin of chip U5 is respectively connected to the other end of capacitor CY2, the other end of capacitor C167 and grounded. The primary side of transformer L2 has the same-name ends respectively connected to one end of capacitor C18, one end of capacitor C22, the first pin of pin P2, and the first pin of pin P3 and connected to the input 24V voltage. The secondary side of transformer L2 has the same-name ends respectively connected to the other end of capacitor C18, the other end of capacitor C22, the second pin of pin P1 and grounded.

9. A method for controlling a steam oven, using the steam oven control system according to any one of claims 1 to 7, characterized in that: The main control circuit inputs a control signal to the MOSFET tube drive circuit, the coil of relay SSR1 is energized, the electric heating element starts to heat, and the thermocouple circuit collects the temperatures of multiple temperature probes in the steam oven in real time. The main control circuit inputs a control signal to the relay drive circuit, the fan M runs, and the working mode is selected. When the working mode is steam mode or steam-bake mode, the main control circuit receives the temperature of the temperature probe. When the temperature is too high or too low, the main control circuit inputs a control signal to the MOSFET tube drive circuit, the coil of relay SSR1 is de-energized or energized to adjust the temperature. The main control circuit inputs a control signal to the MOSFET tube drive circuit, the water inlet solenoid valve YV1 is energized, and steam is generated. When the working mode is dry-bake mode, the main control circuit inputs a control signal to the MOSFET tube drive circuit, the water inlet solenoid valve YV1 is de-energized, and no steam is generated. When the working mode is the core temperature mode, several temperature probes are inserted into the food, and the main control circuit adjusts the temperature according to the received temperature.

10. A steam oven, comprising the steam oven control system according to any one of claims 1 to 8, characterized in that: It also includes a box body, an electric heating element, a temperature probe, a steam generator, and a fan. The control system is located on the box body, the electric heating element is located inside the box body, multiple temperature probes are located at different positions in the box body, the steam generator and the fan are both located on the side of the box body, and the water inlet solenoid valve YV1 is connected to the water inlet pipe of the steam generator.

Images