Integrated cooker control circuit and integrated cooker

Abstract

The utility model discloses a control circuit of an integrated cooker. The control circuit comprises a main controller; a transformer having: a main winding to which the AC power supply is connected; the auxiliary winding is connected with the power supply chip; the output winding is connected with a direct current load; the isolation module comprises an isolation element, and the input end of the isolation element is connected with the main controller; the control end of the switching element is connected with the output end of the isolating element, one end of a switching path is connected with the auxiliary winding, and the other end of the switching path is connected with a power driving circuit through a linear voltage regulator; and the power driving circuit is connected with the motor. The utility model further provides an integrated cooker. On one hand, the main controller and the frequency converter are isolated, meanwhile, the main controller can cut off the power supply of the frequency converter through the switching element when a fault occurs, meanwhile, the number of the output ends of the transformer is kept unchanged, the space of the circuit is not increased, PCB layout and wiring and the structural design of the integrated cooker are facilitated, and the cost is reduced. And the multi-load power supply voltage requirement of the integrated cooker can be effectively met.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to an integrated stove control circuit, and an integrated stove including the integrated stove control circuit. Background Technology

[0002] An integrated cooktop is a kitchen appliance that combines the functions of multiple kitchen appliances into one unit, typically including a cooktop, range hood, steamer, and oven. It aims to save kitchen space, improve cooking efficiency, and reduce the emission of oil fumes and heat. Integrated cooktops usually feature a one-piece design, making them more suitable for modern kitchen styles.

[0003] Integrated cooktops typically integrate multiple water pumps and motors. These pumps and motors are controlled by frequency converters. Functionally, the main controller of the integrated cooktop is responsible for the overall control logic, including start-up, stop, and status monitoring, while the frequency converter controls the water pumps and motors. The main controller and the frequency converter communicate with each other, enabling the frequency converter to operate effectively according to the instructions of the main controller; the two work together. Besides the water pumps and motors, integrated cooktops also integrate various other electrical loads, such as indicator lights or electronic locks. The output windings of the transformer in the power supply convert the input AC voltage to DC voltage and provide different levels of power to the electrical loads.

[0004] For safety and fault protection, isolation is required between the main controller and the frequency converter. At the same time, the main controller also needs to cut off the power supply to the frequency converter in case of a fault. Considering that the output winding of the transformer needs to maintain the function of supplying power to the electrical load, the existing technology uses relays for isolation. For example, an additional transformer output is added, and the control signal of the main controller is connected to the coil of the relay through the relay. The normally open contact of the relay is connected to the control input of the frequency converter.

[0005] However, adding an output transformer increases the space required, which is not conducive to PCB layout and wiring and the structural design of the integrated stove. At the same time, the relay contacts are easily affected by electric arcs and wear. Utility Model Content

[0006] In view of the above problems, the first aspect of this application designs and provides an integrated stove control circuit, comprising: a main controller; a transformer having: a main winding connected to an AC power supply; an auxiliary winding connected to a power chip; an output winding connected to a DC load; an isolation module including an isolation element, the input terminal of which is connected to the main controller; a switching element, the control terminal of which is connected to the output terminal of the isolation element, one end of which is connected to the auxiliary winding, and the other end of which is connected to a power drive circuit via a linear regulator; the power drive circuit is connected to a motor.

[0007] Furthermore, the isolation element is an optocoupler, which includes: a light-emitting diode, the anode of which is connected to the main controller via a first resistor, and the cathode of which is grounded; a phototransistor, the emitter of which is grounded, and the collector of which is connected to the control terminal of the switching element via a first voltage divider resistor; and also includes: a second voltage divider resistor, the first end of which is connected to the control terminal of the switching element, and the second end of which is connected to the auxiliary winding on one side and to the switching path on the other side.

[0008] Furthermore, it also includes: a first rectifier module, which includes: a first rectifier diode, the positive terminal of the first rectifier diode being connected to the auxiliary winding, and the negative terminal being connected to the switching path; a first filter unit, which includes: a first filter resistor and a first filter capacitor connected in series, and the first filter unit being connected in parallel with the first rectifier diode.

[0009] Furthermore, it also includes: a first energy storage filter capacitor, whose positive terminal is connected to the rectifier module and whose negative terminal is grounded; and a dummy load resistor, which is connected in parallel with the energy storage filter capacitor.

[0010] Furthermore, the linear regulator includes: an input terminal, one of which is connected to the switching path of the switching element, and the other of which is connected to the positive terminal of the second energy storage filter capacitor, the negative terminal of the second energy storage filter capacitor being grounded; a third of which is connected to the positive terminal of the third filter capacitor, the negative terminal of the third filter capacitor being grounded; a grounding terminal, the grounding terminal being grounded; and an output terminal, one of which is connected to the power drive circuit, and the other of which is connected to the positive terminal of the fourth energy storage filter capacitor, the negative terminal of the fourth energy storage filter capacitor being grounded.

[0011] Preferably, the switching element is a MOSFET.

[0012] Furthermore, the auxiliary winding includes: a first terminal, which is grounded; and a second terminal, one of which is connected to the power chip and the other is connected to the first rectifier module.

[0013] Furthermore, it also includes: a second rectifier module, one end of which is connected to the second terminal and the other end of which is connected to the power chip; it includes: a second rectifier diode, the positive terminal of which is connected to the second terminal; and a second filter unit, which includes: a second filter resistor and a second filter capacitor connected in series, the second filter unit being connected in parallel with the second rectifier diode.

[0014] A second aspect of this application provides an integrated stove, including an integrated stove control circuit, comprising: a main controller; a transformer having: a main winding connected to an AC power supply; an auxiliary winding connected to a power chip; an output winding connected to a DC load; an isolation module including an isolation element, the input terminal of which is connected to the main controller; a switching element, the control terminal of which is connected to the output terminal of the isolation element, one end of which is connected to the auxiliary winding, and the other end of which is connected to a power drive circuit via a linear regulator; the power drive circuit is connected to a motor.

[0015] Furthermore, the integrated stove includes: a steam oven, the steam oven including a first water pump; an oven, the oven including a second water pump; a plurality of motors; and the power drive circuit connects the motors, the first water pump and / or the second water pump to drive the motors, the first water pump and / or the second water pump to operate.

[0016] This application isolates the main controller and the frequency converter. In the event of a fault, the main controller can cut off the power supply to the frequency converter through a switching element. At the same time, it keeps the number of transformer output terminals unchanged and does not increase the circuit space. This is beneficial for PCB layout and wiring as well as the structural design of the integrated stove. It can effectively meet the multi-load power supply voltage requirements of the integrated stove.

[0017] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic block diagram of the integrated stove control circuit provided in this application;

[0020] Figure 2 This is a partial circuit diagram of the integrated stove control circuit provided in this application;

[0021] Figure 3 This is a partial circuit diagram of the integrated stove control circuit provided in this application;

[0022] Figure 4 This is a schematic block diagram of the integrated stove control circuit provided in this application. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "electrical connection" should be interpreted broadly. For example, they can refer to fixed electrical connections, detachable electrical connections, or integral electrical connections. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. In the description of the embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0027] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] An integrated cooktop is a modern kitchen appliance that combines multiple cooking functions into one unit, typically including a cooktop, oven, and steamer, designed to improve cooking efficiency and save kitchen space. Integrated cooktops combine traditional separate kitchen appliances into a compact, powerful device that meets the diverse needs of daily family cooking.

[0029] Integrated cooktops rely on electric power and consist of a main controller and a frequency converter. The main controller is responsible for the overall control logic of the integrated cooktop, including start-up, stop, and status monitoring, and is also used for touch interaction and function scheduling. The frequency converter controls the water pump and motor, such as adjusting the motor speed. The frequency converter includes a frequency converter controller, and the main controller and the frequency converter controller are communicatively connected. The main controller and the frequency converter controller can each be implemented using a separate MCU chip; no further limitation on the MCU model is specified here.

[0030] Integrated cooktops also include various DC loads, including but not limited to lighting devices (such as knob lights, cavity lights, and ambient lights) and electronic locks.

[0031] A frequency converter includes a frequency converter controller and a power drive circuit. The frequency converter controller receives control commands, generates pulse width modulation signals, and receives feedback signals (such as speed and position). The power drive circuit receives the pulse width modulation signals from the frequency converter controller, causing its switching devices to quickly turn on and off, thereby converting the control signals into signals suitable for the power switching devices to control the motor's speed and torque.

[0032] The integrated cooktop is powered by AC mains power. This application designs and discloses a control circuit for an integrated cooktop, such as... Figure 1 As shown, the integrated stove control circuit 1 includes a transformer 1. The transformer 1 includes a main winding 21, an auxiliary winding 22, and an output winding 23. The transformer 1 is used for voltage conversion and power transmission. The main winding 21 obtains power from the AC power supply 11 and performs voltage transformation. The auxiliary winding 22 meets the specific load requirements of the control circuit and signal transmission. The output winding 23 connects to the DC load 13 to ensure a stable power supply. Specifically, the main winding 21 of the transformer 1 is connected to the AC power supply 11, the auxiliary winding 22 is connected to the power chip 12, and the output winding 23 supplies power to the DC load 13. The main winding 21 of the transformer 1 obtains AC power from the AC power supply. After conversion by the transformer 1, the auxiliary winding 22 provides the necessary voltage to the power chip 12, while the output winding 23 provides a stable DC power supply to the DC load 13. The power chip 12 can be used for voltage conversion and current management (including overcurrent protection and overtemperature protection), and the model of the power chip 12 is not further limited here.

[0033] The integrated stove control circuit 1 also includes an isolation module 30, which includes an isolation element 31 and a switching element 32. The input terminal of the isolation element 31 is connected to the main controller 10, and the output terminal of the isolation element 31 is connected to the control terminal of the switching element 32. One end of the switching path of the switching element 32 is connected to the auxiliary winding 22, and the other end is connected to the power drive circuit 15 via the linear regulator 14, providing a +15V voltage to the power drive circuit 15. The power drive circuit 15 is connected to a motor to drive the motor 16 to run.

[0034] This application isolates the main controller and the frequency converter. In the event of a fault, the main controller can cut off the power supply to the frequency converter through a switching element. At the same time, it keeps the number of transformer output terminals unchanged and does not increase the circuit space. This is beneficial for PCB layout and wiring as well as the structural design of the integrated stove. It can effectively meet the multi-load power supply voltage requirements of the integrated stove.

[0035] Preferably, the isolation element 31 is an optocoupler. In other embodiments of this application, other isolation elements 31 may also be selected, such as digital isolators, etc., and the models of isolation elements 31 will not be listed here.

[0036] Preferably, the switching element 32 is a transistor.

[0037] like Figure 2 As shown, an optocoupler IC2D is selected as the isolation element 31. Isolation element 31 includes an input light-emitting diode (LED) and an output phototransistor. The anode of the LED is connected to the main controller RAL1410 via a first resistor R51, and the cathode is grounded. The emitter of the phototransistor is grounded, and the collector is connected to the control terminal of the switching element Q2 via a first voltage-dividing resistor R50. The first voltage-dividing resistor R50 and the second voltage-dividing resistor R49 work together; the first end of the second voltage-dividing resistor R49 is connected to the control terminal of the switching element Q2, and one end of the second end is connected to the auxiliary winding, while the other end is connected to the switching path of the switching element Q2.

[0038] The main controller RAL1410 generates a corresponding input level signal, which controls the switching state of the switching element Q2 and further controls the power supply to the power drive circuit 15. The input level signal is sent to the input side of the optocoupler IC2D. When the input level signal is valid (e.g., a high level signal), the light-emitting diode is laser-activated and emits a light signal. The emitted light signal propagates through a transparent insulating material (e.g., a plastic encapsulation material) to the output side of the optocoupler IC2D. This process achieves electrical isolation between the input and output sides, preventing high voltage or noise interference. Upon receiving the light signal, the phototransistor on the output side generates a corresponding electrical signal, thus conducting under light illumination and allowing current to flow, enabling signal transmission. The electrical signal generated on the output side is further input to the control terminal of the switching element Q2, further driving the switching element Q2 to turn on or off the switching path. In other words, depending on the input level signal generated by the main controller RAL1410, the switching element Q2 will have different switching states.

[0039] like Figure 2As shown, the MOSFET is used as the switching element Q2. The gate G of the MOSFET is connected to the collector of the phototransistor via the first voltage divider resistor R50, the source S is connected to the auxiliary winding, and the drain D is connected to the power drive circuit 15 via the linear regulator IC1D. Other transistors, such as bipolar junction transistors, can also be used as the switching element Q2, which will not be described in detail here.

[0040] The integrated stove control circuit 1 also includes a first rectifier module. The first rectifier module includes a first rectifier diode D24 and a first filter unit. The positive terminal of the first rectifier diode D24 is connected to the auxiliary winding, and the negative terminal is connected to the switching path. The first filter unit includes a first filter resistor R47 and a first filter capacitor C10 connected in series, and the first filter unit is connected in parallel with the first rectifier diode D24.

[0041] The integrated stove control circuit 1 also includes a first energy storage filter capacitor E7 and a dummy load resistor R48. The positive terminal of the first energy storage filter capacitor E7 is connected to the rectifier module, and the negative terminal is grounded. The dummy load resistor R48 is connected in parallel with the first energy storage filter capacitor E7. The first energy storage filter capacitor E7 is used to smooth the voltage and reduce voltage fluctuations, while the dummy load resistor R48 can provide a stable load, thereby helping to maintain the stability of the output voltage. When the switching element Q2 is working, the load may generate pulse current. The dummy load resistor R48 also helps to absorb the pulse, prevent drastic voltage fluctuations, and also provides a discharge path to ensure that the first energy storage filter capacitor E7 discharges normally when not in use.

[0042] like Figure 2 As shown, the linear regulator IC1D includes an input terminal I NPUT, a ground terminal GND, and an output terminal OUTPUT. The input terminal I NPUT is connected in three ways: one to the switching path of the switching element Q2, another to the positive terminal of the second energy storage filter capacitor E8 (the negative terminal of E8 is grounded), and a third to the positive terminal of the third filter capacitor C11 (the negative terminal of C11 is grounded). The ground terminal GND is grounded. The output terminal OUTPUT is connected in two ways: one to the power drive circuit 15, and another to the positive terminal of the fourth energy storage filter capacitor E9 (the negative terminal of E9 is grounded).

[0043] like Figure 3As shown, the auxiliary winding of transformer T1 includes a first terminal 1 and a second terminal 2. The first terminal 1 is grounded, and the second terminal 2 has one path (PVCC terminal) connected to the power chip 12 and the other path (VCC IO_AC terminal) connected to the first rectifier module. The second terminal 2 of the auxiliary winding is also equipped with a second rectifier module, one end of which is connected to the second terminal 2, and the other end of which is connected to the power chip 12. The second rectifier module includes a second rectifier diode D3 and a second filter unit. The second filter unit includes a second filter resistor R10 and a second filter capacitor C3 connected in series. The second filter unit is connected in parallel with the second rectifier diode D3.

[0044] In such Figure 3 In this circuit, the output winding of transformer T1 is connected to the DC load and provides a +12V voltage to it. The output winding of transformer T1 uses parallel resistors R1 and R2 to prevent excessive current from affecting the DC load, and also uses a parallel diode group D1 to prevent reverse current from the DC load, avoiding damage from current noise and suppressing transient voltage spikes to protect the DC load from high-voltage surges. A capacitor C1 is located downstream of resistors R1 and R2 to smooth the output voltage and maintain its stability. On one side of the output winding, there are also a fifth energy storage filter capacitor E2, a sixth energy storage filter capacitor E1, a seventh filter capacitor C2, and a resistor R3.

[0045] The main winding 21 of transformer T1 filters the AC signal through a parallel RC circuit (R5 and CX1) to suppress high-frequency noise.

[0046] The transformer T1 also has a feedback isolation module 41 on the output winding 23 side. The feedback isolation module 41 is used to provide feedback signals on the output winding 23 side, so that the control circuit can adapt to different types of loads, especially in integrated stoves with varying loads and multiple loads, to maintain system performance. The feedback isolation module 41 includes an optocoupler IC1.

[0047] A second aspect of this application provides an integrated cooktop. The integrated cooktop includes the integrated cooktop control circuit 1 provided in any of the above embodiments.

[0048] In some embodiments of this application, such as Figure 4 As shown, the integrated cooktop includes a steamer 51 and an oven 53. The steamer 51 includes a first water pump 52, and the oven 53 includes a second water pump 54. The integrated cooktop also includes several motors, such as a tilting motor 55. A power drive circuit 15 connects the tilting motor 55, the first water pump 52, and the second water pump 54 to drive the tilting motor 55, the first water pump 52, or the second water pump 54 to operate.

[0049] 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 can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for 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 claimed by this utility model.

Claims

1. An integrated stove control circuit, comprising: a main controller; a transformer having: a main winding connected to an AC power source; an auxiliary winding connected to a power chip; an output winding connected to a DC load; characterized in that it further comprises: an isolation module including an isolation element having an input connected to the main controller; a switching element having a control end connected to an output of the isolation element, a switching path connected at one end to the auxiliary winding and at the other end to a power drive circuit via a linear voltage regulator; the power drive circuit being connected to a motor.

2. The integrated stove control circuit according to claim 1, characterized in that: the isolation element is an optocoupler including: a light emitting diode having an anode connected to the main controller via a first resistor and a cathode connected to ground; a phototransistor having an emitter connected to ground and a collector connected to the control end of the switching element via a first voltage dividing resistor; further comprising: a second voltage dividing resistor having a first end connected to the control end of the switching element and a second end connected to the auxiliary winding in one path and to the switching path in another path.

3. The integrated stove control circuit according to claim 2, characterized in that it further comprises: a first rectification module including: a first rectifier diode having an anode connected to the auxiliary winding and a cathode connected to the switching path; a first filter unit including a first filter resistor and a first filter capacitor connected in series, the first filter unit being connected in parallel to the first rectifier diode.

4. The integrated stove control circuit according to claim 3, characterized in that it further comprises: a first energy storage filter capacitor having a positive pole connected to the rectification module and a negative pole connected to ground; a dummy load resistor connected in parallel to the energy storage filter capacitor.

5. The integrated stove control circuit according to claim 4, characterized in that the linear voltage regulator includes: an input end connected in one path to the switching path of the switching element, in another path to a positive pole of a second energy storage filter capacitor, a negative pole of the second energy storage filter capacitor being connected to ground, and in a third path to a positive pole of a third filter capacitor, a negative pole of the third filter capacitor being connected to ground; a ground end connected to ground; an output end connected in one path to the power drive circuit and in another path to a positive pole of a fourth energy storage filter capacitor, a negative pole of the fourth energy storage filter capacitor being connected to ground.

6. The integrated stove control circuit according to claim 5, characterized in that the switching element is a MOS transistor.

7. The integrated stove control circuit according to claim 6, characterized in that the auxiliary winding includes: a first terminal connected to ground; a second terminal connected in one path to the power chip and in another path to the first rectification module.

8. The integrated stove control circuit according to claim 7, characterized in that it further comprises: a second rectification module having one end connected to the second terminal and the other end connected to the power chip; including: a second rectifier diode having a positive pole connected to the second terminal. ​ ​ ​ ​ ​ ​ A second filter unit comprising a second filter resistor and a second filter capacitor connected in series, the second filter unit being connected in parallel with the second rectifier diode.

9. An integrated hob, characterized in that The integrated kitchen control circuit comprises the integrated kitchen control circuit according to any one of claims 1 to 8.

10. The integrated cooktop of claim 9, wherein, The integrated kitchen comprises: A steamer comprising a first water pump; An oven comprising a second water pump; A plurality of motors; The power drive circuit is connected to the motors, the first water pump and / or the second water pump to drive the motors, the first water pump and / or the second water pump to operate.

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