Steaming oven control system and steaming oven

Abstract

The utility model provides a steaming oven control system and a steaming oven, which belong to the field of steaming ovens, the steaming oven control system comprises a main control circuit, a thermocouple circuit, a relay drive circuit and an MOSFET tube drive circuit, the thermocouple circuit is connected with a plurality of temperature probes, the plurality of temperature probes are located at different positions in the steaming oven, the main control circuit is connected with the thermocouple circuit, and the relay drive circuit is connected with the main control 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 miniaturized design is suitable for ship cabins with limited sizes.

Description

Technical Field

[0001] This utility model relates to the field of steam oven technology, and in particular to a steam oven control system and a steam oven. Background Technology

[0002] Currently available multi-functional steam ovens on the market are mostly quite large. To enable underwater use, the product must be miniaturized while ensuring stable operation of various steaming, baking, and steam-baking functions. For example, the Chinese utility model patent CN221242500U, "A Marine Electric Multi-functional Steam Oven," addresses the problem of existing steam ovens lacking a fixed base, making them prone to shifting during ship movement. It improves the oven's structure by installing support legs at the bottom of the oven body, positioning frames on the left and right outer walls, and anti-slip pads at the bottom of the support legs. When the oven is placed on a shelf, the anti-slip pads increase the friction between the support legs and the surface, enhancing the oven's anti-slip performance and improving its stability. The positioning frames are secured to the shelf with bolts, effectively ensuring the oven's stability on the ship. However, this patent does not address how to modularize the control system of the steam oven to accommodate the space-constrained conditions of ship cabins. Utility Model Content

[0003] The technical problem to be solved by this utility model is how to design a simple steam oven control system to meet the usage requirements of space-constrained ship cabins.

[0004] This utility model solves the above-mentioned technical problems through the following technical solution: a steam oven control system, including a main control circuit, a thermocouple circuit, a relay drive circuit, and a MOSFET drive circuit. The thermocouple circuit is connected to multiple temperature probes located at different positions inside the steam oven. The main control circuit is connected to the thermocouple circuit to control the thermocouple circuit to select a temperature probe and transmit the temperature of the probe to the main control circuit. The output terminal of the relay drive circuit is connected to a fan M. The main control circuit is connected to the input terminal of the relay drive circuit to control the start and stop of the fan M, which is located on the steam oven. The output terminal of the MOSFET drive circuit is connected to the coil of relay SSR1 and the water inlet solenoid valve YV1. The main control circuit is connected to the input terminal of the MOSFET drive circuit to control the coil of relay SSR1 and the water inlet solenoid valve YV1 to be energized or de-energized. Relay SSR1 is connected in series with a heating element located inside the steam oven. The water inlet solenoid valve YV1 is located on the steam oven.

[0005] Beneficial effects: This utility model connects the output terminal of the MOSFET drive circuit to the coil of the relay SSR1, and the relay SSR1 is connected in series with the heating element. Temperature probes are placed at different positions inside the steam oven and connected to the thermocouple circuit. The output terminal of the MOSFET drive circuit is connected to the water inlet solenoid valve YV1, and the fan is connected to the output terminal of the relay drive circuit. The main control circuit is connected to the thermocouple circuit, the relay drive circuit, and the MOSFET drive circuit respectively. The system has a modular design with a clear structure, high reliability, and is easy to expand and maintain. It meets the requirements of miniaturization design, is suitable for space-constrained ship cabins, and can meet the needs of underwater living and working environments.

[0006] Preferably, the main control circuit includes chip U1, model CH32V307VCT6. Pins 1, 2, 3, 4, 5, 38, 97, and 98 of chip U1 are connected to the relay drive circuit. Pin 6 of chip U1 is connected to ground in series with capacitor C2. Pin 10 of chip U1 is connected to pin 11 in series with capacitor C3. Pin 21 of chip U1 is connected to ground in series with capacitor C20. Pin 22 of chip U1 is connected to ground in series with capacitor C4. Pin 28 of chip U1 is connected to ground in series with capacitor C10. Pins 29, 30, and 31 of chip U1 are connected to the thermocouple circuit. Pin 49 of chip U1 is connected to pin 12 in series with capacitor C17. Pin 50 of chip U1, pins 55 to 62 of chip U1 are connected to the MOSFET 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, pins 82 and 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, pins 10, 19, 20, 27, 49, 74 and 99 of chip U1 are all grounded, and pins 11, 21, 28, 50, 75 and 100 of chip U1 are all connected to 3.3V.

[0007] Beneficial effects: The present invention uses a microcontroller of model CH32V307VCT6 in the main control circuit. This model of microcontroller has reliable and stable performance, strong scalability, and high-speed computing and data processing capabilities.

[0008] Preferably, the thermocouple circuit includes chip U3, chip U4, chip U8, resistor R66, and capacitor C29. The first pins of chip U3 and chip U4 are respectively connected to the two ends of the fifth temperature probe; the second pins of chip U3 and chip U4 are respectively connected to the two ends of the seventh temperature probe; the fourth pins of chip U3 and chip U4 are respectively connected to the two ends of the eighth temperature probe; the fifth pins of chip U3 and chip U4 are respectively connected to the two ends of the sixth temperature probe; the twelfth pins of chip U3 and chip U4 are respectively connected to the two ends of the fourth temperature probe; the thirteenth pins of chip U3 and chip U4 are respectively connected to the two ends of the first temperature probe; the fourteenth pins of chip U3 and chip U4 are respectively connected to the two ends of the second temperature probe; the fifteenth pins of chip U3 and chip U4 are respectively connected to the two ends of the third temperature probe; and the third pin of chip U3 is respectively connected to one end of resistor R66 and one end of chip U8. The second pin, the other end of resistor R66, is connected to the first pin of chip U8 and then grounded. The sixth, seventh, and eighth pins 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, 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 to the fourth pin 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. 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 can be connected to two chips, U3 and U4, at the same time. The two chips can be selected. Chip U8 converts the analog temperature into a digital value and transmits the temperature to the main control circuit. By placing multiple temperature probes in different positions inside the steam oven, the temperature at multiple locations inside the steam oven can be measured.

[0010] Preferably, the relay driving circuit includes chip U13, resistors R11, R12, resistors R17-R22, LEDs LED12-LED19, and multiple relays U57-U64. The first pin of chip U13 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; the seventh pin of chip U13 is connected to the ninety-eighth pin of chip U1; and the eighth pin of chip U13 is connected to... Pin 97 of chip U1 is connected to the ground, pin 9 of chip U13 is grounded, pin 10 of chip U13 is connected to 5V, pin 11 of chip U13 is 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 LED16, and the anode of LED16 is connected to the other end of relay U57 coil. Pin 12 of chip U13 is 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 LED13, and the anode of LED13 is connected to the other end of relay U58 coil. Pin 13 of chip U13 is connected to one end of resistor R18. One end of the relay U59 coil and the other end of the resistor R18 are connected to the cathode of LED15. The anode of LED15 is connected to the other end of the relay U59 coil. The fourteenth pin of chip U13 is connected to one end of resistor R19 and one end of the relay U60 coil. The other end of resistor R19 is connected to the cathode of LED17. The anode of LED17 is connected to the other end of the relay U60 coil. The fifteenth pin of chip U13 is connected to one end of resistor R22 and one end of the relay U61 coil. The other end of resistor R22 is connected to the cathode of LED19. The anode of LED19 is connected to the other end of the relay U61 coil. At one end, pin 16 of chip U13 is connected to one end of resistor R21 and one end of relay U62 coil. The other end of resistor R21 is connected to the cathode of LED18, and the anode of LED18 is connected to the other end of relay U62 coil. Pin 17 of chip U13 is connected to one end of resistor R17 and one end of relay U63 coil. The other end of resistor R17 is connected to the cathode of LED14, and the anode of LED14 is connected to the other end of relay U63 coil. Pin 18 of chip U13 is connected to one end of resistor R11 and one end of relay U64 coil. The other end of resistor R11 is connected to the cathode of LED12.The anode of LED12 is connected to the other end of the coil of relay U64.

[0011] Preferably, the MOSFET driving circuit includes chip U6, resistors R1, R4, R5-R9, R81-R88, LEDs LED4-LED11, MOSFETs Q22-Q25, MOSFETs Q33-Q36, chip U75, and chip U76. The first, second, third, fourth, fifth, sixth, seventh, and eighth pins of chip U6 are respectively connected to the sixty-second, sixty-first, sixty-sixth, fifty-ninth, fifty-eighth, fifty-seventh, fifty-sixth, and fifty-fifth pins of chip U1, and the ninth pin of chip U6... Grounded, pin 10 of chip U6 is connected to a 5V voltage and one end of resistors R81-R88. Pins 11 through 18 of chip U6 are connected to the other ends of resistors R81-R88. Pin 11 of chip U6 is connected to one end of resistor R4 and the gate of MOSFET Q22. Pin 12 of chip U6 is connected to one end of resistor R6 and the gate of MOSFET Q23. Pin 13 of chip U6 is connected to one end of resistor R8 and the gate of MOSFET Q24. Pin 14 of chip U6 is connected to one end of resistor R10 and the gate of MOSFET Q25. Pin 15 of chip U6 is connected to... One end of resistor R1 is connected to the gate of MOSFET Q33. Pin 16 of chip U6 is connected to one end of resistor R5 and the gate of MOSFET Q34. Pin 17 of chip U6 is connected to one end of resistor R7 and the gate of MOSFET Q35. Pin 18 of chip U6 is connected to one end of resistor R9 and the gate of MOSFET Q36. The cathode of LED5 is connected to the source of MOSFET Q22 and then grounded. The drain of MOSFET Q22 is connected to pin 1 of chip U75. The cathode of LED7 is connected to the source of MOSFET Q23 and then grounded. The drain of MOSFET Q23 is connected to pin 3 of chip U75. The cathode of LED9 is connected to the source of MOSFET Q24 and then grounded. The drain of MOSFET Q24 is connected to pin 5 of chip U75. The cathode of LED11 is connected to the source of MOSFET Q25 and then grounded. The drain of MOSFET Q25 is connected to pin 7 of chip U75. The cathode of LED4 is connected to the source of MOSFET Q33 and then grounded. The cathode of LED6 is connected to the source of MOSFET Q34 and then grounded. The cathode of LED8 is connected to the source of MOSFET Q35 and then grounded. The cathode of LED10 is connected to the source of MOSFET Q36 and then grounded.The other ends of resistors R4, R6, R8, R10, R1, R5, R7, and R9 are connected to the anodes of LEDs LED5, LED7, LED9, LED11, LED4, LED6, LED8, and LED10, respectively. The drains of MOSFETs Q33-Q36 are connected to pins 1, 3, 5, and 7 of chip U76, respectively.

[0012] Beneficial effects: MOSFET control is achieved by connecting 8 sets of field-effect transistor circuits through chip U6. The drains of the 8 field-effect transistors are connected to 2 sets of connectors. Each connector has 8 pins, which are connected to the load circuit in pairs. The on and off of the load circuit is controlled by the program.

[0013] Preferably, it also includes an RJ45 network port circuit, which includes a network port chip J1, resistors R70-R72, resistors R89-R92, capacitors C110 and C116. The sixth pin of the network port chip J1 is connected in series with 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 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 resistor R91 and then connected to the sixty-sixth pin of the chip U1. The first pin of the network port chip J1 is connected in series with resistor R92 and then connected to the sixty-fifth pin of chip U1. The fourth and fifth pins of the network port chip J1 are connected to a 3.3V voltage and connected in series with capacitor C110 to ground. The ninth pin of the network port chip J1 is connected in series with resistor R70 and then connected to a 3.3V voltage. The twelfth pin is connected in series with 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 chip U1, and the tenth pin of the network port chip J1 is connected to the sixteenth pin of chip U1.

[0014] Preferably, the circuit also includes a debug serial port circuit, an SWD&UART port circuit, a USB interface circuit, and a NORFLASH interface circuit. The debug serial port circuit includes chip H13, with its first pin grounded, its second pin connected to pin 68 of chip U1, its third pin connected to pin 69 of chip U1, and its fourth pin connected to 3.3V. The SWD&UART port circuit includes chip U12, with its first pin grounded, its second pin connected to pin 76 of chip U1, and its third pin connected to pin 72 of chip U1. The USB interface circuit includes chip USB2, diode D5, and diode D6, with chip USB2's first pin grounded and its second pin connected to diodes D5 and D6 respectively. The cathode of diode D6, pin 70 of chip U1, and the anode of diode D6 are grounded. The third pin is connected to the cathode of diode D5 and pin 71 of chip U1. The fourth pin is connected to the anode of diode D5 and then grounded. Pins 5 to 8 are grounded. The NORFLASH interface circuit includes chip U27. The first pin of chip U27 is connected to pin 51 of chip U1. The second pin of chip U27 is connected to pin 53 of chip U1. The fifth pin of chip U27 is connected to pin 54 of chip U1. The sixth pin of chip U27 is connected to pin 52 of chip U1. The seventh and eighth pins of chip U27 are connected to a 3.3V voltage and one end of capacitor C23. The other end of capacitor C23 is grounded.

[0015] Preferably, the device also includes a dehumidifier valve switch interface circuit and a door switch detection circuit. The dehumidifier 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 port CN2 is connected to one end of resistor R27, one end of capacitor C25, the cathode of diode D7, and the 88th pin of chip U1. The other end of resistor R27 is connected to the cathode of LED22. The anode of LED22 is connected to a 3.3V voltage. The anode of diode D7 is connected to the other end of capacitor C25. The second pin of port CN2 is connected to ground; the door switch detection circuit includes LED23, resistor R28, capacitor C26, diode D8, and port CN3. The first pin of port CN3 is connected to one end of resistor R28, one end of capacitor C26, the cathode of diode D8, and the 85th pin of chip U1. The other end of resistor R28 is connected to the cathode of LED23. The anode of LED23 is connected to 3.3V. The anode of diode D8 is connected to the other end of capacitor C26 and then connected to the second pin of port CN3 and grounded.

[0016] Preferably, the system also includes an inlet water pump pressure detection circuit and a washing pump pressure switch detection circuit. The inlet water 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 port CN4 is connected to one end of resistor R29, one end of capacitor C27, the cathode of diode D9, and the 86th pin of chip U1. The other end of resistor R29 is connected to the cathode of LED21. The anode of LED21 is connected to a 3.3V voltage. The anode of diode D9 is connected to the other end of capacitor C27 and then connected to port CN4. The second pin of CN4 is grounded; the washing pump pressure switch detection circuit includes LED20, resistor R30, capacitor C28, diode D10, and port CN5. The first pin of port CN5 is connected to one end of resistor R30, one end of capacitor C28, the cathode of diode D10, and the 87th pin of chip U1. The other end of resistor R30 is connected to the cathode of LED20. The anode of LED20 is connected to 3.3V. The anode of diode D10 is connected to the other end of capacitor C28 and then connected to the second pin of port CN5 and grounded.

[0017] This utility model also provides a steam oven, including the aforementioned steam oven control system, and further including a cabinet, an electric heating element, a temperature probe, a steam generator, and a fan. The control system is located on the cabinet, the electric heating element is located inside the cabinet, multiple temperature probes are located at different positions inside the cabinet, the steam generator and the fan are both located on the side of the cabinet, and the water inlet solenoid valve YV1 is connected to the water inlet pipe of the steam generator. Attached Figure Description

[0018] Figure 1 A perspective view of a steam oven provided for an embodiment of this utility model;

[0019] Figure 2 Electrical schematic diagram of a steam oven control system provided for an embodiment of this utility model;

[0020] Figure 3 Electrical schematic diagram of a steam oven control system provided for an embodiment of this utility model;

[0021] Figure 4 A circuit diagram of the main control circuit in the steam oven control system provided for an embodiment of this utility model;

[0022] Figure 5 A circuit diagram of the reset circuit in the steam oven control system provided for an embodiment of this utility model;

[0023] Figure 6 A circuit diagram of the crystal oscillator circuit in the steam oven control system provided for an embodiment of this utility model;

[0024] Figure 7 A circuit diagram of the download and operation indicator circuit in the steam oven control system provided for an embodiment of this utility model;

[0025] Figure 8 A circuit diagram of the current detection interface circuit in the steam oven control system provided for an embodiment of this utility model;

[0026] Figure 9 A circuit diagram of the voltage detection interface circuit in the steam oven control system provided for an embodiment of this utility model;

[0027] Figure 10 A circuit diagram of the I / O lead-out interface circuit in the steam oven control system provided for an embodiment of this utility model;

[0028] Figure 11 A circuit diagram of the thermocouple circuit in the steam oven control system provided for an embodiment of this utility model;

[0029] Figure 12 A circuit diagram of the relay drive circuit in the steam oven control system provided for an embodiment of this utility model;

[0030] Figure 13 A circuit diagram of the MOSFET drive circuit in the steam oven control system provided for an embodiment of this utility model;

[0031] Figure 14 Circuit diagrams of various serial port circuits in the steam oven control system provided for embodiments of this utility model;

[0032] Figure 15 A circuit diagram of the RJ45 network port circuit in the steam oven control system provided for an embodiment of this utility model;

[0033] Figure 16 A circuit diagram of a 5V to 3.3V power conversion circuit in a steam oven control system provided for an embodiment of this utility model;

[0034] Figure 17 The circuit diagram of the 24V to 12V power conversion circuit in the steam oven control system provided in the embodiment of this utility model. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model are described clearly and completely below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0036] like Figure 1 As shown, this embodiment provides a steam oven, including a housing 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 housing 10, and multiple temperature probes are located at different positions inside the housing 10. The steam generator and the fan 40 are both located on the side of the housing 10, and the water inlet solenoid valve 31 is connected to the water inlet pipe 32 of the steam generator.

[0037] like Figure 2-17 As shown, this embodiment provides a steam oven control system, including a main control circuit, a thermocouple circuit, a relay drive circuit, a MOSFET drive circuit, and a power supply circuit. The thermocouple circuit is connected to multiple temperature probes located at different positions inside the steam oven. The main control circuit is connected to the thermocouple circuit to control the thermocouple circuit to select a temperature probe and transmit the temperature of that probe to the main control circuit. The output of the relay drive circuit is connected to a fan M, and the main control circuit is connected to the input of the relay drive circuit to control the start and stop of the fan M, which is located on the steam oven. The output of the MOSFET drive circuit is connected to the coil of relay SSR1 and the water inlet solenoid valve YV1, and the main control circuit is connected to the input of the MOSFET drive circuit to control the coil of relay SSR1 and the water inlet solenoid valve YV1 to be energized or de-energized. Relay SSR1 is connected in series with a heating element located inside the steam oven. The water inlet solenoid valve YV1 is located on the steam oven. The power supply circuit supplies power to the main control circuit, the thermocouple circuit, the relay drive circuit, and the MOSFET drive circuit.

[0038] This utility model's steam oven control system controls the steam oven to operate in four different modes: steam mode, dry roast mode, steam roast mode, and center temperature mode. In actual use, the appropriate mode is selected based on the cooking requirements of different foods. For example, for foods that cook relatively quickly (such as egg tarts and chicken wings), the dry roast mode is selected. In this mode, the temperature is between 30℃ and 250℃, requiring the heating element and fan to work simultaneously. For steaming rice, the steam mode is selected. In this mode, the temperature is between 30℃ and 105℃. At this time, the heating element heats up, the fan rotates, and the water inlet solenoid valve opens, allowing water to flow onto the heating element, be heated to generate steam, and enter the steam oven, thus steaming the food. The steam roast mode and steam cooking mode are also available. Similarly, in this mode, the heating element heats up, the fan rotates, and the water inlet solenoid valve opens, allowing water to flow onto the heating element and be heated to generate steam that enters the oven. However, the water inlet solenoid valve is open for a shorter time compared to the steam mode. In the steam-bake mode, the temperature ranges from 30°C to 250°C. The center temperature mode is used in any of the three operating modes—steam, dry-bake, and steam-bake—to address situations where the food is not easily cooked through. In addition to placing temperature probes at different locations inside the oven, a temperature probe is also inserted inside the food. By controlling the temperature of the probe inside the food, the food is heated to a temperature between 42°C and 72°C. In the center temperature mode, the heating element heats up, the fan rotates, and the water inlet solenoid valve opens or closes.

[0039] To control the steam oven in the four different operating modes mentioned above, this invention connects the output of the MOSFET driver circuit to the coil of relay SSR1. Relay SSR1 is connected in series with the heating element. The main control circuit controls the energization or de-energization of the relay SSR1 coil. When the relay SSR1 coil is energized, the heating element is powered on and begins heating, generating heat that is conducted to the air inside the steam oven, thus heating the food. When the relay SSR1 coil is de-energized, the heating element stops working and no longer generates heat. The output of the MOSFET driver circuit is also connected to the water inlet solenoid valve YV1. The main control circuit controls the energization or de-energization of the water inlet solenoid valve YV1. When the water inlet solenoid valve YV1 is energized… Water flows towards the heating element. If the heating element is in heating mode, the water will be heated to produce steam, which enters the steam oven. Temperature probes are placed at different locations inside the steam oven and connected to a thermocouple circuit. The main control circuit controls the thermocouple circuit to select the temperature probes at different locations and transmits the temperature of each probe to the main control circuit. When the temperature is too high or too low, the heating power of the heating element is reduced or increased to control the temperature within the set range. The fan is connected to the output of the relay drive circuit. The main control circuit controls the relay drive circuit, thereby controlling the start and stop of the fan. When the fan is working, it can evenly circulate hot air into the steam oven, ensuring that the food is heated evenly and improving the cooking effect.

[0040] like Figure 4As shown, the main control circuit includes chip U1, which is a CH32V307VCT6 microcontroller. The first pin of chip U1 is connected to the sixth pin of chip U13 in the relay drive circuit. The second pin of chip U1 is connected to the fifth pin of chip U13. The third pin of chip U1 is connected to the fourth pin of chip U13. The fourth pin of chip U1 is connected to the third pin of chip U13. The fifth pin of chip U1 is connected to the second pin of chip U13. The sixth pin of chip U1 is connected in series with capacitor C2 and then grounded. The tenth pin of chip U1 is connected in series with capacitor C3 and then grounded to the first pin of chip U13. Pin 11 of chip U1 is grounded. Pin 11 of chip U1 is connected to 3.3V. Pins 19 and 20 of chip U1 are both grounded. Pin 21 of chip U1 is connected to ground in series with capacitor C20 and is connected to 3.3V. Pin 22 of chip U1 is connected to ground in series with capacitor C4. Pin 27 of chip U1 is grounded. Pin 28 of chip U1 is connected to ground in series with capacitor C10 and is connected to 3.3V. Pin 29 of chip U1 is connected to pin 6 of chip U8 in the thermocouple circuit. Pin 30 of chip U1 is connected to pin 5 of chip U8 in the thermocouple circuit. Pin 31 of chip U1 is connected to pin 7 of chip U8 in the thermocouple circuit. Pin 38 of chip U1 is connected to pin 1 of chip U13 in the relay drive circuit. Pin 49 of chip U1 is connected in series with capacitor C17 and then connected to pin 50 of chip U1. Pin 49 of chip U1 is grounded. Pin 50 of chip U1 is connected to 3.3V. Pin 55 of chip U1 is connected to pin 8 of chip U6 in the MOSFET drive circuit. Pin 56 of chip U1 is connected to pin 50 of chip U6. Pin 7 of chip U1 is connected to pin 6 of chip U6. Pin 58 of chip U1 is connected to pin 5 of chip U6. Pin 59 of chip U1 is connected to pin 4 of chip U6. Pin 60 of chip U1 is connected to pin 3 of chip U6. Pin 61 of chip U1 is connected to pin 2 of chip U6. Pin 62 of chip U1 is connected to pin 1 of chip U6. Pin 74 of chip U1 is connected in series with capacitor C9 and then connected to pin 75 of chip U1. Pin 74 of chip U1 is grounded, and pin 75 of chip U1 is connected to 3.With a voltage of 3V, pin 81 of chip U1 is connected to pins 9 of both chip U3 and U4 in the thermocouple circuit; pin 82 of chip U1 is connected to pins 10 of both chip U3 and U4 in the same circuit; pin 83 of chip U1 is connected to pins 11 of both chip U3 and U4 in the same circuit; pin 97 of chip U1 is connected to pin 8 of chip U13 in the relay driver circuit; pin 98 of chip U1 is connected to pin 7 of chip U13 in the relay driver circuit; pin 99 of chip U1 is connected in series with capacitor C1 and then connected to pin 100 of chip U1; pin 99 of chip U1 is grounded; and pin 100 of chip U1 is connected to a voltage of 3.3V.

[0041] This invention employs a CH32V307VCT6 microcontroller in its main control circuit. This microcontroller is reliable, stable, and highly scalable, possessing high-speed computing and data processing capabilities. Through chip U1, it controls the thermocouple circuit, relay drive circuit, and MOSFET drive circuit, enabling real-time monitoring of internal temperature and humidity. By controlling the heating element, the fan's start / stop, and whether water is added to the heating element to generate steam, it can precisely control parameters such as internal temperature, humidity, and time of the steam oven. This allows for automatic adjustments based on different foods and cooking needs, making cooking safer and more intelligent. Because it can control the temperature and time required by the food, it avoids energy waste, reduces cooking time, and improves cooking efficiency.

[0042] like Figure 5-10 As shown, the main control circuit also includes a reset circuit, a crystal oscillator circuit, a download and run indicator circuit, a current detection interface circuit, a voltage detection interface circuit, and an I / O output interface circuit. (See attached image.) Figure 5 The reset circuit includes resistor R3, capacitor C14, and switch SW2. One end of capacitor C14 is connected to one end of resistor R3, one end of switch SW2, and pin 14 of chip U1. The other end of capacitor C14 is connected to ground after being connected to the other end of switch SW2. The other end of resistor R3 is connected to 3.3V. Switch SW2 is a TSA363G25-250B. When switch SW2 is pressed, the microcontroller resets.

[0043] See Figure 6The crystal oscillator circuit includes crystal oscillator X1, crystal oscillator X2, capacitors C11, C12, C13, and C15. One end of crystal oscillator X1 is connected to one end of capacitor C11 and pin 12 of chip U1. The other end of crystal oscillator X1 is connected to one end of capacitor C12 and pin 13 of chip U1. The other end of capacitor C11 is connected to ground after connecting to the other end of capacitor C12. One end of crystal oscillator X2 is connected to one end of capacitor C13 and pin 8 of chip U1. The other end of crystal oscillator X2 is connected to one end of capacitor C15 and pin 9 of chip U1. The other end of capacitor C13 is connected to ground after connecting to the other end of capacitor C15. Crystal oscillator X1 is a high-frequency crystal oscillator with a frequency of 8MHz, and crystal oscillator X2 is a low-frequency crystal oscillator with a frequency of 32.768kHz. This circuit provides a clock signal to chip U1.

[0044] See Figure 7 The download and run indicator circuit includes switch SW3, resistors R13, R15, and R16, power supply B1, connector H5, LED2, and LED3. Switch SW3 is a DSIC021LSGET. Its fourth pin is connected to a 3.3V power supply. The first pin of switch SW3 is connected to one end of resistor R13 and pin 94 of chip U1. The second pin of switch SW3 is connected to one end of resistor R14 and pin 37 of chip U1. The other ends of resistors R13 and R14 are connected to ground. One end of resistor R15... Connect the anode of LED2 to pin 23 of chip U1. Connect one end of resistor R16 to the anode of LED3 and the cathode of LED3 to pin 24 of chip U1. Connect the other end of resistor R15 to the other end of resistor R16 and apply 3.3V. Connect the first pin of connector H5 to 3.3V, the second pin of connector H5 to pin 6 of chip U1, and the third pin of connector H5 to the positive terminal of power supply B1. Power supply B1 is grounded (model CR1220-2). To download the program, toggle switch SW3 to 1 or 2. VBAT represents a dedicated pin for battery operation mode. Connect a battery or other power source to the VBAT pin to preserve the contents of the backup register and maintain RTC functionality when power is off. If no external battery is used in the application, the VBAT pin should be connected to the VDD pin. Connect a button battery to pin B1. When a button battery is available, connect pins 2 and 3 of H5. When no button battery is available, connect pins 1 and 2 of H5.

[0045] See Figure 8The current detection interface circuit includes chip U77, model number B4B-XH-A(LF)(SN). Pin 1 of chip U77 is connected to pin 34 of chip U1, pin 2 of chip U77 is connected to pin 33 of chip U1, pin 3 of chip U77 is connected to pin 18 of chip U1, and pin 4 of chip U77 is grounded. (See also...) Figure 9 The voltage detection interface circuit includes chip U78, model number B4B-XH-A(LF)(SN). Pin 1 of chip U78 is connected to pin 17 of chip U1, pin 2 of chip U78 is connected to pin 36 of chip U1, pin 3 of chip U78 is connected to pin 35 of chip U1, and pin 4 of chip U78 is grounded. (See also...) Figure 10 The I / O interface circuit includes chip H15, which is a PZ254V-11-04P connector. Pin 1 of chip H15 is connected to pin 95 of chip U1, pin 2 is connected to pin 91 of chip U1, pin 3 is connected to pin 90 of chip U1, and pin 4 is connected to pin 89 of chip U1. This circuit is used for data transmission.

[0046] like Figure 11As shown, the thermocouple circuit is connected to multiple temperature probes. The thermocouple circuit includes chips U3, U4, and U8, resistor R66, and capacitor C29. Chips U3 and U4 are both model CD4051BM / TR, and chip U8 is a temperature transducer model MAX6675ISA+T. The first pins of chips U3 and U4 are connected to the two ends of the fifth temperature probe, respectively. The second pins of chips U3 and U4 are connected to the two ends of the seventh temperature probe, respectively. The fourth pins of chips U3 and U4 are connected to the two ends of the eighth temperature probe, respectively. The fifth pins of chips U3 and U4 are connected to the two ends of the sixth temperature probe, respectively. The twelfth pins of chips U3 and U4 are connected to the two ends of the fourth temperature probe, respectively. The thirteenth pins of chips U3 and U4 are connected to the two ends of the first temperature probe, respectively. The fourteenth pins of chips U3 and U4 are connected to the two ends of the second temperature probe, respectively. The fifteenth pins of chips U3 and U4 are connected to the third temperature probe, respectively. At both ends, the third pin of chip U3 is connected to one end of resistor R66 and the second pin of chip U8, respectively. The other end of resistor R66 is connected to the first pin of chip U8 and then grounded. The sixth, seventh, and eighth pins 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, 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 to the fourth pin in series with capacitor C29 and then grounded. The fourth pin is connected to a voltage of 3.3V. 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. The seventh pin of chip U8 is connected to the thirty-first pin of chip U1.

[0047] In practical work, the number of temperature probes can be selected according to the work needs. By placing multiple temperature probes in different positions inside the steam oven, it is possible to monitor the temperature at multiple locations inside the steam oven. For example, the fourth temperature probe of this utility model is a K-type thermocouple, which is placed near the heating element to measure the oven cavity temperature. The first temperature probe is also a K-type thermocouple, which is placed near the condenser opening to measure the condensation temperature. In addition, four temperature probes are placed in different positions in the center of the steam oven to measure four temperatures. The minimum value among the four temperatures is taken as the center temperature of the steam oven.

[0048] In practical applications, temperature probes are typically connected to thermocouple circuits via connectors. For example, in this embodiment, the thermocouple circuit also includes chips U35-U38, all of which are model KF2EDGV-5.0-4P. Each chip U35-U38 has four pins, which are connected in pairs to connect eight temperature probes. The first and second pins of chip U35 are connected to the twelfth pins of chip U3 and chip U4, respectively. The third and fourth pins of chip U35 are connected to the thirteenth pins of chip U3 and chip U4, respectively. The first and second pins of chip U36 are connected to the thirteenth pins of chip U3 and chip U4, respectively. Pin 14 of chip U3 and pin 14 of chip U4; pins 3 and 4 of chip U36 are connected to pins 15 of chip U3 and pins 15 of chip U4, respectively; pins 1 and 2 of chip U37 are connected to pins 1 of chip U3 and pins 1 of chip U4, respectively; pins 3 and 4 of chip U37 are connected to pins 2 of chip U3 and pins 2 of chip U4, respectively; pins 1 and 2 of chip U38 are connected to pins 4 of chip U3 and pins 4 of chip U4, respectively; pins 3 and 4 of chip U38 are connected to pins 5 of chip U3 and pins 5 of chip U4, respectively. For example... Figure 3 As shown, in this invention, the first and second pins of chip U35 are respectively connected to the two ends of furnace cavity temperature sensor TC1, the third and fourth pins of chip U35 are respectively connected to the two ends of condensation temperature sensor TC2, and the four pins of chips U36 and U37 are all connected to the two ends of intermediate temperature sensor TC3. The main control circuit sends signals to the ninth, tenth, and eleventh pins of chips U3 and U4 respectively for chip select. For example, 001 indicates that A2, A1, and A0 are 0, 0, and 1, respectively. At this time, the third pin of chips U3 and U4 transmits the temperature of channel Y1, i.e., the fourteenth pin (A2 / B2). The third pin of chips U3 and U4 transmits the value to the temperature converter MAX6675ISA+T for temperature conversion, converting the analog quantity into a digital quantity. The temperature is then transmitted to the main control circuit through serial port SPI1.

[0049] like Figure 12As shown, the relay drive circuit includes chip U13, resistors R11, R12, resistors R17-R22, LEDs LED12-LED19, and multiple relays. Chip U13 is model ULN2803A. The first pin of chip U13 is connected to pin 38 of chip U1; the second pin of chip U13 is connected to pin 5 of chip U1; the third pin of chip U13 is connected to pin 4 of chip U1; the fourth pin of chip U13 is connected to pin 3 of chip U1; the fifth pin of chip U13 is connected to pin 2 of chip U1; the sixth pin of chip U13 is connected to pin 1 of chip U1; and the seventh pin of chip U13 is connected to pin 98 of chip U1. Pin 8 of chip U13 is connected to pin 97 of chip U1. Pin 9 of chip U13 is grounded. Pin 10 of chip U13 is connected to 5V. Pin 11 of chip U13 is 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 LED16. The anode of LED16 is connected to the other end of the coil of relay U57. Pin 12 of chip U13 is 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 LED13. The anode of LED13 is connected to the other end of the coil of relay U58. Pin 13 is connected to one end of resistor R18 and one end of the coil of relay U59. The other end of resistor R18 is connected to the cathode of LED15, and the anode of LED15 is connected to the other end of the coil of relay U59. Pin 14 of chip U13 is 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 LED17, and the anode of LED17 is connected to the other end of the coil of relay U60. Pin 15 of chip U13 is 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 LED19. The anode of LED19 is connected to the other end of the relay U61 coil. The sixteenth pin of chip U13 is connected to one end of resistor R21 and one end of the relay U62 coil. The other end of resistor R21 is connected to the cathode of LED18. The anode of LED18 is connected to the other end of the relay U62 coil. The seventeenth pin of chip U13 is connected to one end of resistor R17 and one end of the relay U63 coil. The other end of resistor R17 is connected to the cathode of LED14. The anode of LED14 is connected to the other end of the relay U63 coil. The eighteenth pin of chip U13 is connected to one end of resistor R11 and one end of the relay U64 coil.The other end of resistor R11 is connected to the cathode of LED12, and the anode of LED12 is connected to the other end of the coil of relay U64.

[0050] The ULN2803A chip is a monolithic integrated high-voltage, high-current Darlington transistor array, containing eight independent Darlington transistor drivers. An internal freewheeling diode is included, allowing it to drive inductive loads such as relays and stepper motors. A single Darlington transistor's collector can output 500mA current; parallel connection of Darlington transistors achieves even higher output current capabilities. This circuit can be widely used in relay driving, lighting driving, LED display driving, stepper motor driving, and logic buffers. Each Darlington transistor in the ULN2803A is connected in series with a 2.7K base resistor, allowing direct connection to TTL / CMOS circuits at a 5V operating voltage, enabling direct processing of data that previously required standard logic buffers.

[0051] The relay drive circuit can connect to both DC and AC loads, and the load current can be very large. Chip U1 controls the IN8-IN1 input pins of chip U13. By sending instructions to pins 1-8 of chip U13 to provide high / low levels, it controls the corresponding eight relays U57-U64. This invention only uses four of these relay control circuits: U59-U62. U59 is a spare; U60 connects to the fan; U61 connects to detergent pump 1; and U62 connects to detergent pump 2. Figure 3 As shown, the first and second pins of chip U60 are connected to the two ends of fan M, the first and second pins of chip U61 are connected to the two ends of cleaning pump Y1, and the first and second pins of chip U62 are connected to the two ends of cleaning pump Y2. When the microcontroller sends a high level to the control terminal corresponding to relay U60, i.e., the IN5 pin of ULN2803A, the relay can be controlled. When a high level is received, the relay coil is energized, the circuit is connected, and the fan or cleaning pump starts to work.

[0052] like Figure 13As shown, the MOSFET driver circuit includes chip U6, resistors R1, R4, R5-R9, R81-R88, LEDs LED4-LED11, MOSFETs Q22-Q25, Q33-Q36, chip U75, and chip U76. Chip U6 is model ULN2803A, MOSFETs Q22-Q25 and Q33-Q36 are all model PMV60ENEAR, and chips U75 and U76 are both model DB125-2.54-8P-GN-S. The first pin of chip U6 is connected to pin 62 of chip U1, the second pin of chip U6 is connected to pin 61 of chip U1, and the third pin of chip U6... Pin 6 is connected to pin 60 of chip U1; pin 4 of chip U6 is connected to pin 59 of chip U1; pin 5 of chip U6 is connected to pin 58 of chip U1; pin 6 of chip U6 is connected to pin 57 of chip U1; pin 7 of chip U6 is connected to pin 56 of chip U1; pin 8 of chip U6 is connected to pin 55 of chip U1; pin 9 of chip U6 is grounded; pin 10 of chip U6 is connected to a 5V voltage and one end of resistors R81-R88; pins 11 to 18 of chip U6 are connected to the other ends of resistors R81-R88; pin 11 of chip U6 is connected to one end of resistor R4 and the gate of MOSFET Q22. Pin 12 of chip U6 is connected to one end of resistor R6 and the gate of MOSFET Q23. Pin 13 of chip U6 is connected to one end of resistor R8 and the gate of MOSFET Q24. Pin 14 of chip U6 is connected to one end of resistor R10 and the gate of MOSFET Q25. Pin 15 of chip U6 is connected to one end of resistor R1 and the gate of MOSFET Q33. Pin 16 of chip U6 is connected to one end of resistor R5 and the gate of MOSFET Q34. Pin 17 of chip U6 is connected to one end of resistor R7 and the gate of MOSFET Q35. Pin 18 of chip U6 is connected to one end of resistor R9 and the gate of MOSFET Q36. The other end of resistor R4 is connected to... The resistor R6 is connected to the anode of LED5. The cathode of LED5 is connected to the source of MOSFET Q22 and then grounded. The drain of MOSFET Q22 is connected to the first pin of chip U75. The other end of resistor R6 is connected to the anode of LED7. The cathode of LED7 is connected to the source of MOSFET Q23 and then grounded. The drain of MOSFET Q23 is connected to the third pin of chip U75. The other end of resistor R8 is connected to the anode of LED9. The cathode of LED9 is connected to the source of MOSFET Q24 and then grounded. The drain of MOSFET Q24 is connected to the fifth pin of chip U75. The other end of resistor R10 is connected to the anode of LED11.The cathode of LED11 is connected to the source of MOSFET Q25 and then grounded. The drain of MOSFET Q25 is connected to pin 7 of chip U75. The other end of resistor R1 is connected to the anode of LED4. The cathode of LED4 is connected to the source of MOSFET Q33 and then grounded. The drain of MOSFET Q33 is connected to pin 1 of chip U76. The other end of resistor R5 is connected to the anode of LED6. The cathode of LED6 is connected to the source of MOSFET Q34 and then grounded. The drain of MOSFET Q34 is connected to pin 3 of chip U76. The other end of resistor R7... One end of resistor R9 is connected to the anode of LED8. The cathode of LED8 is connected to the source of MOSFET Q35 and then grounded. The drain of MOSFET Q35 is connected to pin 5 of chip U76. The other end of resistor R9 is connected to the anode of LED10. The cathode of LED10 is connected to the source of MOSFET Q36 and then grounded. The drain of MOSFET Q36 is connected to pin 7 of chip U76. Pins 2, 4, 6, and 8 of chip U75 and chip U76 are connected to 24V.

[0053] MOSFET control is achieved by connecting eight N-channel MOSFET circuits via chip U6. The drains of the eight MOSFETs are connected to two sets of connectors (U75 and U76), each with eight pins. These are paired (one pair connects to a +24V power supply via the PCB, and the other connects to the gate of the eight MOSFET circuits (Q36-Q22)) and then to a load circuit. The load circuit is switched on and off via 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 connected to the two ends of the condenser valve-double-headed solenoid valve YV2-2, respectively. The fifth pin of chip U75 is connected to one end of heater-temperature limiter B1. The other end of heater-temperature limiter B1 is connected to one end of solid-state relay SSR1. The other end of 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 dehumidifier valve-DC geared motor M2. The other end of dehumidifier valve-DC geared 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 water inlet solenoid valve YV1. The fifth and sixth pins of chip U76 are connected to the two ends of double-headed solenoid valve YV2-1, respectively. The loads connected to chip U75 in this utility model are: condenser valve - double-headed solenoid valve YV2-2 (connected to pins 1 and 2); heater - temperature limiter B1, solid-state relay SSR1 coil (connected to pins 5 and 6); dehumidifier valve - DC geared motor M2 (connected to pins 7 and 8); a total of 3 loads. The loads connected to 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 sets of loads, with other pins reserved. By applying a high level to pin 61 of chip U1 connected to input terminal IN2 of chip U6, the field-effect transistor Q35 conducts, energizing the double-headed solenoid valve YV2-1 connected to pins 5 and 6 of chip U76, and initiating operation, causing the steam oven to release water for cleaning.

[0054] like Figure 14 As shown, the steam oven control system of this utility model also includes various interface circuits, namely, a debugging serial port circuit, an SWD&UART port circuit, a USB interface circuit, a NORFLASH interface circuit, a dehumidification 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 used to transmit the device's operating status and can also be used to burn programs. It includes chip H13, with its first pin grounded, its second pin connected to the sixty-eighth pin of chip U1, its third pin connected to the sixty-ninth pin of chip U1, and its fourth pin connected to 3.3V. The SWD&UART port circuit is used to download programs and includes chip U12. The first pin of chip U12 is grounded, its second pin connected to the seventy-sixth pin of chip U1, and its third pin connected to the seventy-second pin of chip U1.

[0055] The USB interface circuit includes a chip USB2, diodes D5 and D6. Chip USB2, model USB-226-BRW, has its first pin grounded. Its second pin is connected to the cathode of diode D6 and pin 70 of chip U1. The anode of diode D6 is grounded. Its third pin is connected to the cathode of diode D5 and pin 71 of chip U1. Its fourth pin is connected to the anode of diode D5 and then grounded. Pins 5 through 8 are grounded. This circuit is used for log export and menu import, such as runtime history or fault codes. The NORFLASH interface circuit provides 8M of flash memory for storing logs or menus, including chip U27, model number 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, and the seventh and eighth pins of chip U27 are connected to a 3.3V voltage and one end of capacitor C23. The other end of capacitor C23 is grounded.

[0056] The dehumidifier valve switch interface circuit includes an LED22, a resistor R27, a capacitor C25, a diode D7, and a port CN2. The first pin of port CN2 is connected to one end of resistor R27, one end of capacitor C25, the cathode of diode D7, and pin 88 of chip U1. The other end of resistor R27 is connected to the cathode of LED22. The anode of LED22 is connected to 3.3V. The anode of diode D7 is connected to the other end of capacitor C25 and then to the second pin of port CN2, which is grounded. The door switch detection circuit includes an LED23, a resistor R28, a capacitor C26, a diode D8, and a port CN3. The first pin of port CN3 is connected to one end of resistor R28, one end of capacitor C26, the cathode of diode D8, and pin 85 of chip U1. The other end of resistor R28 is connected to the cathode of LED23. The anode of LED23 is connected to 3.3V. The anode of diode D8 is connected to the other end of capacitor C26 and then to the second pin of port CN3, which is grounded.

[0057] The inlet pump pressure detection circuit includes an LED21, a resistor R29, a capacitor C27, a diode D9, and a port CN4. The first pin of port CN4 is connected to one end of resistor R29, one end of capacitor C27, the cathode of diode D9, and pin 86 of chip U1. The other end of resistor R29 is connected to the cathode of LED21. The anode of LED21 is connected to 3.3V. The anode of diode D9 is connected to the other end of capacitor C27 and then to the second pin of port CN4, which is grounded. The washing pump pressure switch detection circuit includes an LED20, a resistor R30, a capacitor C28, a diode D10, and a port CN5. The first pin of port CN5 is connected to one end of resistor R30, one end of capacitor C28, the cathode of diode D10, and pin 87 of chip U1. The other end of resistor R30 is connected to the cathode of LED20. The anode of LED20 is connected to 3.3V. The anode of diode D10 is connected to the other end of capacitor C28 and then to the second pin of port CN5, which is grounded.

[0058] The serial port interface circuit includes chip U55, model number KF2EDGV-5.0-4P. Pin 1 of chip U55 is grounded, pin 2 is connected to pin 25 of chip U1, pin 3 is connected to pin 26 of chip U1, and pin 4 is connected to 12V. The serial port interface circuit includes chip U79, model number KF2EDGV-5.0-4P. Pin 1 of chip U79 is connected to 12V, pin 2 is connected to pin 78 of chip U1, pin 3 is connected to pin 79 of chip U1, and pin 4 is grounded.

[0059] See Figure 3 The first and second pins of port CN2 are connected to the two ends of switch S4, the first and second pins of port CN3 are connected to the two ends of switch S1, the first and second pins of port CN4 are connected to the two ends of switch S2, and the first and second pins of port CN5 are connected to the two ends of switch S3.

[0060] like Figure 15As shown, the steam oven control system of this utility model 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 C116. The sixth pin of the network port chip J1 is connected in series with resistor R89 ​​and then connected to the sixty-fourth pin of chip U1. The third pin of the network port chip J1 is connected in series with resistor R90 and then connected to the sixty-third pin of chip U1. The second pin of the network port chip J1 is connected in series with resistor R91 and then connected to the sixtieth pin of chip U1. The network interface chip J1 has six pins. Pin 1 is connected in series with resistor R92 and then to pin 65 of chip U1. Pins 4 and 5 of network interface chip J1 are connected to 3.3V and then in series with capacitor C110 to ground. Pin 9 of network interface chip J1 is connected in series with resistor R70 and then to 3.3V. Pin 12 is connected in series with resistor R71 and then to 3.3V. Pin 11 of network interface chip J1 is connected to pin 15 of chip U1, and pin 10 of network interface chip J1 is connected to pin 16 of chip U1. This is used for centralized control of multiple devices during operation, ensuring smooth operation of each communication interface.

[0061] like Figure 16 and Figure 17 As shown, the power supply circuit includes a 5V to 3.3V power conversion circuit and a 24V to 12V power conversion circuit. The 5V to 3.3V power conversion circuit includes chip U2, capacitors C5-C8, resistor R2, and LED1. Chip U2 is model AMS1117-3.3. The first pin of chip U2 is connected to one end of capacitors C5-C8, the cathode of LED1, and the second pin of connector P1 and grounded. The second pin of chip U2 is 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 LED1. The third pin of chip U2 is connected to the other end of capacitor C5, the other end of capacitor C6, and the first pin of connector P1 and connected to the input 5V voltage.

[0062] The 24V to 12V power conversion circuit includes chip U5, transformer L2, capacitors C16, C18, C19, C21, C22, CY1, and CY2. Chip U5 is model VRB2412S-6WR3. The first pin of chip U5 is connected to the opposite-name terminal of the secondary side of transformer L2, one end of capacitor C19, one end of capacitor C21, and one end of capacitor CY2. The second pin of chip U5 is connected to the opposite-name terminal of the primary side of transformer L2, the other end of capacitor C19, the other end of capacitor C21, and one end of capacitor CY1. The sixth pin of U5 is connected to the other end of capacitor CY1, one end of capacitor C16, and the second pin of connector P3 to output 12V voltage. The seventh pin of chip U5 is connected to the other end of capacitor CY2 and the other end of capacitor C167 and grounded. The primary side of transformer L2 is connected to one end of capacitor C18, one end of capacitor C22, the first pin of connector P2, and the first pin of connector P3 to input 24V voltage. The secondary side of transformer L2 is connected to the other end of capacitor C18, the other end of capacitor C22, and the second pin of connector P1 and grounded.

[0063] Through pin P1, the external +5V power supply is converted to +3.3V via chip U2, providing a stable power supply to various modules in the circuit. Through pin P2, the external +24V power supply is converted to 12V via transformer L2 and DC module chip U5 for use by the serial port screen interface circuit (chip U55). Pin P3 can also lead out +24V power, providing a stable power supply to various modules in the circuit.

[0064] The modular design of this utility model's steam oven control system divides the multi-functional steam oven control system into multiple relatively independent modules. This modular design facilitates the expansion of system functions and performance; simply adding or replacing corresponding modules achieves functional upgrades and expansions, improving the system's scalability and flexibility. Modular design also enhances system reliability and stability, as each module can operate independently and provide mutual backup, reducing the possibility of system failures and improving product reliability and stability. Furthermore, modular design makes system maintenance more convenient and faster; only problematic modules need to be inspected or replaced, rather than the entire system, reducing maintenance time and costs. Finally, modular design reduces system manufacturing costs because each module can be designed and manufactured independently, enabling mass production and standardized manufacturing, further reducing manufacturing costs. The control system of this utility model has a clear structure, high reliability, and is easy to expand and maintain.

[0065] Working principle: The following uses the steam-bake mode as an example, combined with... Figure 2 and Figure 3This invention introduces the control process of the steam oven control system of this utility model. Figure 2 and Figure 3 These are electrical schematics for a steam oven. Heating element EH1 is connected in series with relay SSR1 and then to 380V AC power via circuit breaker QF1. The first port of toroidal transformer T1 is connected in series with fuse FU2 and then to circuit breaker QF1. The second port of toroidal transformer T1 is also connected in series with fuse FU1 and then to circuit breaker QF1. The third port of toroidal transformer T1 is connected to one end of the illuminated pushbutton SB1 and the dual-output switching power supply U1. The fourth port of toroidal transformer T1 is connected to one end of fuse FU3, and the other end of fuse FU3 is connected to the illuminated pushbutton S... One end of B1, one end of fan M, and the other end of the illuminated button SB1 are connected to the dual-output switching power supply U1. Fans M5 and M6 are small cooling fans used to dissipate 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 to the positive terminal 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 terminal 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 terminal of the dual-output switching power supply U1. The other end of lamp H1 is connected to the negative terminal of the dual-output switching power supply U1.

[0066] When circuit breaker QF1 is turned on, pressing the illuminated button SB1 will light up the indicator light and the display screen. Select the steam-bake mode on the display screen and set the target temperature and steam-bake time. The display screen feeds back to chip U1 via the interface circuit. Chip U1 controls the MOSFET drive circuit by providing high and low levels to chip U6, thereby controlling the coil of relay SSR1 to be energized or de-energized. When the coil of relay SSR1 is energized, relay SSR1 is turned on, and the heating element begins heating. This invention uses a heating tube as the heating element. Chip U1 controls the on / off state of relay U60 by providing high and low levels to chip U13, thereby controlling the operation of fan M. In steam-bake mode, fan M is always running. Relay U60 is connected to fan M. When relay U60 is turned on, the coil is energized, the normally closed contact of the relay opens, and the normally open contact closes. Figure 2 When the circuit containing the central fan is connected, the fan starts. Temperatures from temperature probes placed at different locations inside the steam oven are collected via thermocouple circuits. This invention places temperature sensors near the heating element to collect the internal temperature of the steam oven in real time, a temperature sensor near the condenser outlet to collect the condenser temperature in real time, and four temperature sensors at the center of the steam oven to collect the center temperature simultaneously. Chip U1 assigns values ​​to chips U3 and U4 to select the corresponding temperature sensor. The analog signal transmitted from the selected temperature sensor is converted into a digital signal by chip U8 and transmitted back to chip U1, allowing the temperature to be displayed on the screen.

[0067] When the heating temperature reaches the set value, chip U1 receives a signal to control the MOSFET drive circuit, which in turn de-energizes the coil of relay SSR1. Relay SSR1 then disconnects, and the heating element stops heating. Similarly, when the collected temperature is lower than the target value, the heating element starts heating again. In steam-baking mode, steam is required. This steam is generated by injecting water into the heating element. The heating element heats for approximately 30 seconds. Then, chip U1 sets the third pin of the MOSFET drive circuit, activating the water inlet solenoid valve YV1. The water inlet pipe sprays water into the heating element, generating steam. After 12 seconds, chip U1 resets the third pin of the MOSFET drive circuit, deactivating the water inlet solenoid valve YV1. The water inlet pipe stops spraying water for 30 seconds, repeating this process intermittently (spraying water for 12 seconds, then stopping for 30 seconds).

[0068] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A steam oven control system, characterized in that: The system includes a main control circuit, a thermocouple circuit, a relay drive circuit, and a MOSFET drive circuit. The thermocouple circuit is connected to multiple temperature probes located at different positions inside the steam oven. The main control circuit is connected to the thermocouple circuit to control the selection of a temperature probe and transmit the temperature from that probe to the main control circuit. The output of the relay drive circuit is connected to the fan M, and the main control circuit is connected to the input of the relay drive circuit to control the start and stop of the fan M, which is located on the steam oven. The output of the MOSFET drive circuit is connected to the coil of relay SSR1 and the water inlet solenoid valve YV1, and the main control circuit is connected to the input of the MOSFET drive circuit to control the energization or de-energization of the coil of relay SSR1 and the water inlet solenoid valve YV1. Relay SSR1 is connected in series with the heating element, which is located inside the steam oven. The water inlet solenoid valve YV1 is located on the steam oven.

2. The steam oven control system according to claim 1, characterized in that: The main control circuit includes chip U1. Pins 1, 2, 3, 4, 5, 38, 97, and 98 of chip U1 are connected to the relay drive circuit. Pin 6 of chip U1 is connected to ground in series with capacitor C2. Pin 10 of chip U1 is connected to pin 11 in series with capacitor C3. Pin 21 of chip U1 is connected to ground in series with capacitor C20. Pin 22 of chip U1 is connected to ground in series with capacitor C4. Pin 28 of chip U1 is connected to ground in series with capacitor C10. Pins 29, 30, and 31 of chip U1 are connected to the thermocouple circuit. Pin 49 of chip U1 is connected to pin 50 in series with capacitor C17. Pins 55 to 62 are connected to the MOSFET 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 pins 9 of chip U3 and 9 of chip U4 in the thermocouple circuit. Pins 82 and 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. Pins 10, 19, 20, 27, 49, 74, and 99 of chip U1 are all grounded. Pins 11, 21, 28, 50, 75, and 100 of chip U1 are all connected to a 3.3V voltage.

3. The steam oven control system according to claim 2, characterized in that: The thermocouple circuit includes chips U3, U4, U8, resistor R66, and capacitor C29. The first pins of chips U3 and U4 are connected to the two ends of the fifth temperature probe, respectively; the second pins of chips U3 and U4 are connected to the two ends of the seventh temperature probe, respectively; the fourth pins of chips U3 and U4 are connected to the two ends of the eighth temperature probe, respectively; the fifth pins of chips U3 and U4 are connected to the two ends of the sixth temperature probe, respectively; the twelfth pins of chips U3 and U4 are connected to the two ends of the fourth temperature probe, respectively; the thirteenth pins of chips U3 and U4 are connected to the two ends of the first temperature probe, respectively; the fourteenth pins of chips U3 and U4 are connected to the two ends of the second temperature probe, respectively; the fifteenth pins of chips U3 and U4 are connected to the two ends of the third temperature probe, respectively; and the third pin of chip U3 is connected to one end of resistor R66 and the second pin of chip U8, respectively. The other end of resistor R66 is connected to the first pin of chip U8 and then grounded. The sixth, seventh, and eighth pins 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, 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 to the fourth pin 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. 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 chip U13, resistors R11, R12, resistors R17-R22, LEDs LED12-LED19, and multiple relays U57-U64. The first pin of chip U13 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; the seventh pin of chip U13 is connected to the ninety-eighth pin of chip U1; and the eighth pin of chip U13 is connected to the chip... Pin 97 of U1 and pin 9 of chip U13 are grounded. Pin 10 of chip U13 is connected to 5V. Pin 11 of chip U13 is 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 LED16. The anode of LED16 is connected to the other end of relay U57 coil. Pin 12 of chip U13 is 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 LED13. The anode of LED13 is connected to the other end of relay U58 coil. Pin 13 of chip U13 is connected to one end of resistor R18 and... One end of the coil of relay U59 and the other end of resistor R18 are connected to the cathode of LED15. The anode of LED15 is connected to the other end of the coil of relay U59. The fourteenth pin of chip U13 is 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 LED17. The anode of LED17 is connected to the other end of the coil of relay U60. The fifteenth pin of chip U13 is 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 LED19. The anode of LED19 is connected to the other end of the coil of relay U61. Pin 16 of chip U13 is 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 LED18, and the anode of LED18 is connected to the other end of the coil of relay U62. Pin 17 of chip U13 is 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 LED14, and the anode of LED14 is connected to the other end of the coil of relay U63. Pin 18 of chip U13 is connected to one end of resistor R11 and one end of the coil of relay U64. The other end of resistor R11 is connected to the cathode of LED12.The anode of LED12 is connected to the other end of the coil of relay U64.

5. The steam oven control system according to claim 2, characterized in that: The MOSFET driver circuit includes chip U6, resistors R1, R4, R5-R9, R81-R88, LEDs LED4-LED11, MOSFETs Q22-Q25, MOSFETs Q33-Q36, chip U75, and chip U76. Pins 1, 2, 3, 4, 5, 6, 7, and 8 of chip U6 are respectively connected to pins 62, 61, 60, 59, 58, 57, 56, and 55 of chip U1. Pin 9 of chip U6 is grounded. Pin 10 of chip U6 is connected to a 5V voltage source and one end of resistors R81-R88. Pins 11 through 18 of chip U6 are connected to the other ends of resistors R81-R88. Pin 11 of chip U6 is connected to one end of resistor R4 and the gate of MOSFET Q22. Pin 12 of chip U6 is connected to one end of resistor R6 and the gate of MOSFET Q23. Pin 13 of chip U6 is connected to one end of resistor R8 and the gate of MOSFET Q24. Pin 14 of chip U6 is connected to one end of resistor R10 and the gate of MOSFET Q25. Pin 15 of chip U6 is connected to resistor R1... One end of the resistor R5 is connected to the gate of the field-effect transistor Q33. The sixteenth pin of chip U6 is connected to one end of resistor R5 and the gate of the field-effect transistor Q34. The seventeenth pin of chip U6 is connected to one end of resistor R7 and the gate of the field-effect transistor Q35. The eighteenth pin of chip U6 is connected to one end of resistor R9 and the gate of the field-effect transistor Q36. The cathode of LED5 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 chip U75. The cathode of 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 chip U75. The cathode of LED9 is connected to the source of MOSFET Q24 and then grounded. The drain of MOSFET Q24 is connected to pin 5 of chip U75. The cathode of LED11 is connected to the source of MOSFET Q25 and then grounded. The drain of MOSFET Q25 is connected to pin 7 of chip U75. The cathode of LED4 is connected to the source of MOSFET Q33 and then grounded. The cathode of LED6 is connected to the source of MOSFET Q34 and then grounded. The cathode of LED8 is connected to the source of MOSFET Q35 and then grounded. The cathode of LED10 is connected to the source of MOSFET Q36 and then grounded.The other ends of resistors R4, R6, R8, R10, R1, R5, R7, and R9 are connected to the anodes of LEDs LED5, LED7, LED9, LED11, LED4, LED6, LED8, and LED10, respectively. The drains of MOSFETs Q33-Q36 are connected to pins 1, 3, 5, and 7 of chip U76, respectively.

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

7. The steam oven control system according to claim 1, characterized in that: It also includes a debug serial port circuit, an SWD&UART port circuit, a USB interface circuit, and a NORFLASH interface circuit. The debug serial port circuit includes chip H13, with its first pin grounded, its second pin connected to pin 68 of chip U1, its third pin connected to pin 69 of chip U1, and its fourth pin connected to 3.3V. The SWD&UART port circuit includes chip U12, with its first pin grounded, its second pin connected to pin 76 of chip U1, and its third pin connected to pin 72 of chip U1. The USB interface circuit includes chip USB2, diode D5, and diode D6, with the first pin of chip USB2 grounded and its second pin connected to pins of diode D6. The cathode and pin 70 of chip U1, and the anode of diode D6 are grounded. The third pin is connected to the cathode of diode 5 and the seventy-first pin of chip U1. The fourth pin is connected to the anode of diode D5 and then grounded. Pins 5 to 8 are grounded. The NORFLASH interface circuit includes chip U27. The first pin of chip U27 is connected to the fifty-first pin of chip U1. The second pin of chip U27 is connected to the fifty-third pin of chip U1. The fifth pin of chip U27 is connected to the fifty-fourth pin of chip U1. The sixth pin of chip U27 is connected to the fifty-second pin of chip U1. The seventh and eighth pins of chip U27 are connected to a 3.3V voltage and one end of capacitor C23. The other end of capacitor C23 is grounded.

8. The steam oven control system according to claim 1, characterized in that: It also includes a dehumidifier valve switch interface circuit and a door switch detection circuit. The dehumidifier 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 port CN2 is connected to one end of resistor R27, one end of capacitor C25, the cathode of diode D7, and the 88th pin of chip U1. The other end of resistor R27 is connected to the cathode of LED22. The anode of LED22 is connected to a 3.3V voltage. The anode of diode D7 is connected to the other end of capacitor C25 and then connected to the terminal. The second pin of port CN2 is grounded; the door switch detection circuit includes LED23, resistor R28, capacitor C26, diode D8, and port CN3. The first pin of port CN3 is connected to one end of resistor R28, one end of capacitor C26, the cathode of diode D8, and the 85th pin of chip U1. The other end of resistor R28 is connected to the cathode of LED23. The anode of LED23 is connected to a 3.3V voltage. The anode of diode D8 is connected to the other end of capacitor C26 and then connected to the second pin of port CN3 and grounded.

9. The steam oven control system according to claim 1, characterized in that: It also includes an inlet water pump pressure detection circuit and a washing pump pressure switch detection circuit. The inlet water pump pressure detection circuit includes an LED21, a resistor R29, a capacitor C27, a diode D9, and a port CN4. The first pin of port CN4 is connected to one end of resistor R29, one end of capacitor C27, the cathode of diode D9, and the 86th pin of chip U1. The other end of resistor R29 is connected to the cathode of LED21. The anode of LED21 is connected to a 3.3V voltage. The anode of diode D9 is connected to the other end of capacitor C27 and then connected to port CN4. The second pin of 4 is grounded; the washing pump pressure switch detection circuit includes LED20, resistor R30, capacitor C28, diode D10, and port CN5. The first pin of port CN5 is connected to one end of resistor R30, one end of capacitor C28, the cathode of diode D10, and the 87th pin of chip U1. The other end of resistor R30 is connected to the cathode of LED20. The anode of LED20 is connected to 3.3V. The anode of diode D10 is connected to the other end of capacitor C28 and then connected to the second pin of port CN5 and grounded.

10. A steam oven, comprising the steam oven control system according to any one of claims 1-9, characterized in that: It also includes a housing, heating elements, temperature probes, a steam generator, and a fan. The control system is located on the housing, the heating elements are located inside the housing, multiple temperature probes are located at different positions inside the housing, the steam generator and the fan are both located on the side of the housing, and the water inlet solenoid valve YV1 is connected to the water inlet pipe of the steam generator.

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