Electromagnetic oven integrated circuit

Abstract

The utility model discloses an induction cooker integrated circuit, and belongs to the technical field of induction cookers. According to the utility model, an open-frame design is adopted, and the main control chip, the power supply control chip, the temperature detection circuit, the IGBT control circuit, the synchronization and back voltage detection circuit, the AC voltage and zero cross detection circuit, the current detection circuit, the communication interface circuit, the power supply conversion circuit and the power supply voltage stabilizing circuit are integrated on one circuit board. And the intelligent control induction cooker module circuit comprising the power supply circuit is formed. According to the induction cooker integrated circuit provided by the utility model, the integration level and the stability of the circuit are improved, the production process is simplified, updating, upgrading and debugging are facilitated, and the induction cooker integrated circuit has remarkable practicability and economical efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of induction cooker, especially to an induction cooker integrated circuit. BACKGROUND

[0002] In the prior art, the control circuit in the induction cooker is usually composed of discrete components, which has the problems of high cost and poor stability. In order to improve these problems, some integrated designs appear on the market, that is, the main control chip and part of its peripheral circuit are packaged in a plastic shell, and connected with external circuit through the way of providing pins. However, the packaging way of the plastic shell has the following disadvantages:

[0003] 1. inconvenient to update: since the integrated circuit is packaged in the plastic shell, it is inconvenient to update and upgrade. Once the main control chip needs to be replaced or upgraded, the entire packaging module must be replaced, increasing the maintenance cost.

[0004] 2. poor flexibility of pins: the pin position in the plastic shell is fixed, and cannot be reasonably changed according to the specific structure of the induction cooker, limiting the flexibility of circuit design.

[0005] 3. poor stability of circuit: there is no power control chip and power auxiliary circuit in the plastic shell, resulting in poor stability of the overall circuit, which is easily disturbed by external interference and affects the normal work of the induction cooker.

[0006] 4. difficult to debug: since the circuit has high integration and is packaged in the plastic shell, it is inconvenient to debug and troubleshoot, increasing the difficulty of research and development and production.

[0007] Therefore, how to design an induction cooker control circuit which is convenient to update, flexible in pins, stable in circuit and easy to debug has become a problem to be solved by the technical personnel in the field. CONTENT OF THE UTILITY MODEL

[0008] The utility model provides an induction cooker integrated circuit for solving the above problems in the background art.

[0009] The induction cooker integrated circuit provided by the utility model adopts an open rack design, integrates the main control chip, the power control chip, a plurality of sampling and control sub-circuits and a plurality of power auxiliary circuits on one circuit board; the sampling and control sub-circuit includes a temperature detection circuit, an IGBT control circuit, a synchronization and back pressure detection circuit, an alternating current voltage and zero crossing detection circuit, a current detection circuit and a communication interface circuit connected with the main control chip; and the power auxiliary circuit includes a power conversion circuit and a power stabilizing circuit connected with the power control chip.

[0010] Preferably, the temperature detection circuit is connected with a furnace surface temperature sensor circuit and an IGBT temperature sensor circuit outside, for detecting the furnace surface temperature and the IGBT temperature.

[0011] Preferably, the IGBT control circuit is connected with an IGBT drive circuit outside.

[0012] Preferably, the power conversion circuit is connected with a power rectifier input circuit, a filter capacitor and a power transformer circuit outside.

[0013] Preferably, the output end of the power stabilizing circuit is connected with the master control chip and the plurality of sampling and control sub-circuits, for providing working power supply for the master control chip and the plurality of sampling and control sub-circuits.

[0014] Preferably, the current detection circuit is connected with a current sampling circuit outside.

[0015] Preferably, the alternating current voltage and zero-crossing detection circuit is connected with an alternating current voltage sampling circuit outside.

[0016] Preferably, the synchronization and back pressure detection circuit is connected with a synchronization signal circuit outside.

[0017] Preferably, the communication interface circuit is connected with a communication interface terminal outside, for realizing communication between the master control chip and the display and key panel.

[0018] Preferably, the induction cooker integrated circuit further comprises a fan and buzzer control circuit connected with the master control chip, and the fan and buzzer control circuit is connected with a fan and buzzer circuit outside.

[0019] The induction cooker integrated circuit provided by the utility model has the following beneficial effects: the induction cooker integrated circuit provided by the utility model adopts an open rack type design, integrates the master control chip, the power control chip and the temperature detection circuit, the IGBT control circuit, the synchronization and back pressure detection circuit, the alternating current voltage and zero-crossing detection circuit, the current detection circuit, the communication interface circuit, the power conversion circuit and the power stabilizing circuit on one circuit board, forms an intelligent control induction cooker module circuit containing a power circuit, makes the circuit inside the induction cooker more simple and compact, improves the stability and anti-interference ability of the integrated circuit, and facilitates the production of the whole machine.

[0020] The induction cooker integrated circuit provided by the utility model has the following beneficial effects:

[0021] 1. High integration: the utility model discloses the open rack type design, the main control chip, power control chip and temperature detection circuit, IGBT control circuit, synchronous and back pressure detection circuit, alternating voltage and zero-crossing detection circuit, current detection circuit, communication interface circuit, power conversion circuit and power supply voltage stabilizing circuit are integrated on a circuit board, and the intelligent control electromagnetic oven module circuit containing power supply circuit is formed. This highly integrated design makes the circuit inside the electromagnetic oven more simple, compact, reduces the component quantity and wiring complexity.

[0022] 2. Strong stability: the highly integrated design improves the stability and anti-interference ability of integrated circuit. The close cooperation and optimized layout between various functional modules reduce the signal transmission path, reduce electromagnetic interference, and ensure the stable operation of the electromagnetic oven in various working environments.

[0023] 3. Easy to produce: simple and compact circuit design makes the whole machine production more convenient. Reducing assembly process and production cost, improving production efficiency and product quality.

[0024] 4. Easy to update and upgrade: the open rack design exposes the components and connection points on the circuit board, making it easy to update and upgrade. Without disassembling the shell, the components on the circuit board can be directly replaced or adjusted, improving the convenience of maintenance and upgrading.

[0025] 5. High pin flexibility: the open rack design allows flexible adjustment of pin position and connection mode according to the specific structure and needs of the electromagnetic oven, improving the flexibility and adaptability of circuit design.

[0026] 6. Debugging is convenient: since the components and connection points on the circuit board are exposed, each node can be accessed and tested directly during debugging, simplifying the debugging process and improving the debugging efficiency.

[0027] In summary, the electromagnetic oven integrated circuit provided by the utility model not only improves the integration and stability of the circuit, but also simplifies the production process, facilitates updating, upgrading and debugging, and has significant practicality and economy. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The electromagnetic oven integrated circuit block diagram provided by the utility model embodiment.

[0029] Figure 2 The internal structure and pin diagram of the electromagnetic oven integrated circuit provided by the utility model embodiment.

[0030] Figure 3 The external connection diagram of the electromagnetic oven integrated circuit provided by the utility model embodiment.

[0031] In the drawings:

[0032] 101, master chip;

[0033] 102, power control chip;

[0034] 103, temperature detection circuit;

[0035] 104, IGBT control circuit;

[0036] 105, synchronization and back pressure detection circuit;

[0037] 106, AC voltage and zero-crossing detection circuit;

[0038] 107, current detection circuit;

[0039] 108, communication interface circuit;

[0040] 109, power conversion circuit;

[0041] 110, power stabilizing circuit;

[0042] 111, fan and buzzer control circuit;

[0043] 201, furnace surface temperature sensor circuit;

[0044] 202, IGBT temperature sensor circuit;

[0045] 203, IGBT drive circuit;

[0046] 204, synchronization signal circuit;

[0047] 205, AC voltage sampling circuit;

[0048] 206, current sampling circuit;

[0049] 207, communication interface terminal;

[0050] 208, power rectifier input circuit;

[0051] 209, power transformer circuit;

[0052] 210, fan and buzzer circuit. DETAILED DESCRIPTION

[0053] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the drawings.

[0054] As Figures 1-3As shown, this utility model embodiment provides an integrated circuit for an induction cooker. The integrated circuit adopts an open-frame design, integrating a main control chip 101, a power control chip 102, multiple sampling and control sub-circuits, and multiple power auxiliary circuits onto a single circuit board. The sampling and control sub-circuit includes a temperature detection circuit 103, an IGBT (Insulated Gate Bipolar Transistor) control circuit 104, a synchronization and reverse voltage detection circuit 105, an AC voltage and zero-crossing detection circuit 106, a current detection circuit 107, and a communication interface circuit 108, all connected to the main control chip 101. The power auxiliary circuit includes a power conversion circuit 109 and a power regulation circuit 110, both connected to the power control chip 102.

[0055] The main control chip 101 is responsible for coordinating and controlling various functions and operations of the induction cooker. The main control chip 101 ensures the efficient, safe, and stable operation of the induction cooker by receiving user input, detecting system status, controlling the switching of IGBTs, and executing protection functions. The power control chip 102 is responsible for managing and controlling the power system of the entire induction cooker. In this embodiment, the main control chip, power control chip, multiple sampling and control sub-circuits, and multiple power auxiliary circuits are integrated on a single circuit board, forming an intelligent control induction cooker module circuit that includes power circuitry. This makes the internal circuitry of the induction cooker simpler and more compact, improves the stability and anti-interference capability of the integrated circuit, and facilitates the production of the entire machine. An open-frame design refers to a circuit design where electronic components and circuit boards are exposed, without a casing or chassis. In this embodiment, the integrated circuit adopts an open-frame circuit design, which has advantages over plastic casing packaging in terms of lower cost, better heat dissipation, and ease of debugging and maintenance. In practical applications, the layout and pin positions of the integrated circuit board can be adjusted according to the structure of the induction cooker, facilitating the application of the integrated circuit to different product structures. The open-shelf design exposes the components and connections on the circuit board, facilitating updates and upgrades. Components can be directly replaced or adjusted without disassembling the casing, improving maintenance and upgrade convenience. Furthermore, the exposed components and connections allow for direct access and testing of individual nodes during debugging, simplifying the process and increasing efficiency.

[0056] like Figure 2 As shown in the embodiment of this utility model, the induction cooker integrated circuit includes 24 external pins. A filter capacitor is connected between pins 2 and 3, and the remaining pins are connected to various sub-circuits within the integrated circuit. The main control chip 101 in this embodiment of the utility model adopts an SOP16 package and includes 16 pins, which will be referred to as P1-P16 in the following text.

[0057] In the embodiment of the utility model, the temperature detection circuit 103 is connected with the furnace surface temperature sensor circuit 201 and the IGBT temperature sensor circuit 202, and is used for detecting the furnace surface temperature and the IGBT temperature. The temperature detection circuit 103 includes pins 14-17, the pins 14-15 are connected with the furnace surface temperature sensor circuit 201, and the pins 16-17 are connected with the IGBT temperature sensor circuit 202. The pin 17 is led out from the pin P11 of the main control chip 101, and the pin 15 is led out from the pin P12 of the main control chip 101. The pin P11 and the pin P12 of the main control chip 101 are connected with the 5V power supply through the first resistor R20 and the second resistor R21 respectively, and the pin 16 and the pin 14 of the temperature detection circuit 103 are grounded.

[0058] In the electromagnetic oven, the IGBT is an important power semiconductor device, which is used for controlling and regulating the high-frequency current in the electromagnetic oven. In the embodiment of the utility model, the IGBT control circuit 104 is connected with the IGBT drive circuit 203. The IGBT control circuit 104 includes a pin 8, which is led out from the pin P8 of the main control chip. The pin 8 is also clamped to the 18V power supply through the first diode D8. The main control chip is connected with the IGBT control circuit 104, and the IGBT control signal is output to the IGBT drive circuit 203 through the IGBT control circuit 104. The IGBT has high current carrying capacity, low conduction loss and fast switching characteristics, and is very suitable for high-frequency switching applications. The main control chip 101 detects the furnace surface temperature and the IGBT temperature in real time through the temperature detection circuit 103, and then outputs the control signal to the IGBT drive circuit 203 through the IGBT control circuit 104. The heating power is adjusted by adjusting the duty cycle of the IGBT, so as to realize accurate temperature control.

[0059] In the embodiment of the utility model, the communication interface circuit 108 is connected with the communication interface terminal 207, and is used for realizing the communication between the main control chip and the display and key panel. The communication interface circuit 108 includes pins 9-13, and the pin 13 is connected with one end of the communication interface terminal 207. The display and key panel is connected with the other end of the communication terminal. The main control chip 101 receives the input instruction of the user on the key panel through the communication interface circuit 108.

[0060] In the embodiment of the utility model, the power conversion circuit 109 is connected with the power rectifier input circuit 208, the filter capacitor and the power transformer circuit 209. The power conversion circuit 109 includes pins 1, 22-24. The pin 1 is connected with the power rectifier input circuit 208. The pin 22 and the pin 23 are connected with the filter capacitor. The pin 23 and the pin 24 are connected with the power transformer circuit 209. Figure 2As shown in the embodiment of this utility model, the power control chip 102 includes 8 pins. Pins 5-8 are connected together, pins 1-2 are connected together, pins 3 and 4 are connected to pin 2 through a third capacitor C10 and a fourth capacitor C12, respectively, and pin 4 is connected to the power regulator circuit 110 through a first Zener diode ZD1 and a second diode D7. Within the integrated circuit, a third resistor R25 is also connected between pins 22 and 23. Pin 23 is connected to an 18V power supply, and pin 22 is connected to pin 2 of the power control chip 102 through a third diode D6. Pin 24 is led out from pin 1 of the power control chip 102, and pin 1 is led out from pin 8 of the power control chip 102. The power conversion circuit 109 converts the high voltage output from the rectifier input circuit 208 into the applied low DC voltage.

[0061] In an induction cooker, a power supply voltage regulator circuit is used to ensure stable output voltage. In this embodiment of the invention, the output terminal of the power supply voltage regulator circuit 110 is connected to the main control chip 101 and the plurality of sampling and control sub-circuits, and is used to provide operating power to the main control chip 101 and the plurality of sampling and control sub-circuits. Figure 2 As shown in the embodiment of this utility model, the power supply regulator circuit 110 includes a fourth resistor R26, a fifth resistor R28, a first transistor Q1, and a second Zener diode ZD2. One end of the second Zener diode ZD2 is grounded, and the other end is connected to an 18V power supply through the fourth resistor R26. The end of the fourth resistor R26 connected to the 18V power supply is also connected to the power conversion circuit 109. The base of the first transistor Q1 is connected between the second Zener diode ZD2 and the fourth resistor R26, and the collector is connected between the fourth resistor R26 and the 18V power supply. The emitter is connected to the current detection circuit 106 through the fifth resistor R28. The pin 2 of the integrated circuit is connected to the first transistor Q1 through the fifth resistor R28. The power supply regulator circuit outputs a 5V DC power supply through the fifth resistor R28.

[0062] In this embodiment of the invention, the current detection circuit 107 is externally connected to the current sampling circuit 206. Specifically, the current detection circuit 107 is connected to the current sampling circuit 206 via pin 5. In this embodiment of the invention, the current detection circuit 107 is used to amplify and sample current values ​​and detect surge current. Figure 3 In this circuit, the current is sampled by connecting a shunt resistor in series. The current detection circuit 107 is connected to pins P13 and P14 of the main control chip 101. When the main control chip detects that the surge current amplitude exceeds a preset threshold, it can immediately take emergency protection measures to protect critical components such as IGBTs in the circuit.

[0063] The utility model embodiment, the alternating voltage and zero -crossing detection circuit 106 is connected with the alternating voltage sampling circuit 205 outwardly. Specifically, the alternating voltage and zero -crossing detection circuit 106 is connected with the alternating voltage sampling circuit 205 through pin 4. The alternating voltage and zero -crossing detection circuit 106 obtains alternating voltage and zero -crossing point through resistance step -down and chip sampling comparison, and the alternating voltage and zero -crossing detection circuit 106 is connected with the pin P1 of main control chip 101. The alternating voltage and zero -crossing detection circuit 106 is mainly used for detecting the zero -crossing point of alternating power voltage, that is the time when voltage is from positive half cycle transition to negative half cycle or from negative half cycle transition to positive half cycle. The zero -crossing detection circuit can provide an accurate reference point for the synchronous switching operation of IGBT. By starting IGBT at the appropriate time after each zero -crossing point, it can ensure that the high-frequency current of the induction cooker is synchronized with the alternating power voltage, thereby improving efficiency and stability. When the induction cooker starts, the drive voltage of IGBT can be gradually increased through the zero -crossing detection circuit to realize soft start. In this way, the large current impact during start-up can be avoided, and the components in the circuit can be protected. According to the zero -crossing detection result, the duty cycle of PWM can be dynamically adjusted, thereby realizing real-time control of the heating power of the induction cooker. By detecting the zero -crossing point of alternating voltage, voltage abnormal conditions such as overvoltage or undervoltage can be found in time, so that appropriate protection measures can be taken to avoid circuit damage.

[0064] In the embodiment of the utility model, the synchronous and back pressure detection circuit 105 is connected with the synchronous signal circuit 204 outwardly. Specifically, the synchronous and back pressure detection circuit 105 is connected with the synchronous signal circuit 204 through pin 7, and the synchronous and back pressure detection circuit 105 is connected with the pins P15 and P16 of the main control chip 101. The synchronous and back pressure detection circuit 105 includes a synchronous detection circuit of a resonant circuit and an IGBT back pressure detection circuit. The synchronous detection circuit of the resonant circuit is used to ensure that the switching operation of IGBT is synchronized with the resonant frequency, and the IGBT back pressure detection circuit is used to protect IGBT from damage by excessive reverse voltage.

[0065] In the induction cooker, the fan plays a role in cooling the internal components, and the buzzer emits sound signals to help users understand the working state, fault condition and other important information of the induction cooker. Figures 1-3As shown, in the utility model embodiment, the integrated circuit of the induction cooker further comprises a fan and a buzzer control circuit 111 connected with the main control chip 101, and the fan and the buzzer control circuit 111 are externally connected with a fan and a buzzer circuit 210. Wherein, the fan and the buzzer control circuit 111 comprise pins 18, 19, 20, 21, the pins 18, 19 are externally connected with the fan, and the pins 20, 21 are externally connected with the buzzer. The pin 20 is led out from the pin P5 of the main control chip 101, the pin 19 is connected with the pin P5 of the main control chip 101 through the second triode Q2 and the resistance R22 in the integrated circuit, the pin 18 is connected with the 18V power supply in the integrated circuit, and the pin 21 is connected with the 5V power supply through the resistance R23 in the integrated circuit.

[0066] The integrated circuit of the induction cooker provided by the utility model has the following beneficial effects:

[0067] 1. High integration: the utility model adopts open rack design, integrates the main control chip, the power control chip, the temperature detection circuit, the IGBT control circuit, the synchronization and back pressure detection circuit, the alternating voltage and zero crossing detection circuit, the current detection circuit, the communication interface circuit, the power conversion circuit and the power stabilizing circuit on one circuit board, and forms an intelligent control induction cooker module circuit containing a power circuit. This highly integrated design makes the circuit inside the induction cooker more simple and compact, reduces the number of components and the complexity of wiring.

[0068] 2. Strong stability: the highly integrated design improves the stability and anti-interference ability of the integrated circuit. The close cooperation and optimized layout of the various functional modules reduce the signal transmission path, reduce electromagnetic interference, and ensure the stable operation of the induction cooker in various working environments.

[0069] 3. Convenient production: the simple and compact circuit design makes the whole machine production more convenient. Reducing assembly process and production cost, improving production efficiency and product quality.

[0070] 4. Easy to update and upgrade: the open rack design exposes the components and connection points on the circuit board, making it easy to update and upgrade. Without disassembling the shell, the components on the circuit board can be directly replaced or adjusted, improving the convenience of maintenance and upgrading.

[0071] 5. High flexibility of pin: the open rack design allows flexible adjustment of the position and connection mode of the pin according to the specific structure and demand of the induction cooker, improving the flexibility and adaptability of the circuit design.

[0072] 6. Debugging is convenient: since the components and connection points on the circuit board are exposed, each node can be accessed and tested directly during debugging, simplifying the debugging process and improving the debugging efficiency.

[0073] The integrated circuit of the electromagnetic oven improves the integration and stability of the circuit, simplifies the production process, facilitates updating, upgrading and debugging, and has remarkable practicality and economy.

[0074] The embodiments of the utility model are described above in combination with the drawings, but the utility model is not limited to the specific embodiments described above, and the specific embodiments described above are only illustrative but not restrictive, and the ordinary skilled in the art can make many forms of deformation under the inspiration of the utility model without departing from the purpose of the utility model and the scope protected by the claims, and these all belong to the protection of the utility model.

Claims

1. An integrated circuit for an electromagnetic hob, characterized in that The electromagnetic oven integrated circuit adopts open rack design, integrates the main control chip (101), power control chip (102) and multiple sampling and control sub-circuits, multiple power auxiliary circuits on one circuit board; the sampling and control sub-circuit includes temperature detection circuit (103), IGBT control circuit (104), synchronization and back pressure detection circuit (105), alternating current voltage and zero-crossing detection circuit (106), current detection circuit (107), communication interface circuit (108) connected with the main control chip (101); the power auxiliary circuit includes power conversion circuit (109) and power stabilizing circuit (110) connected with the power control chip (102).

2. The integrated circuit for an induction cooktop as claimed in claim 1, characterized in that The temperature detection circuit (103) is connected with the furnace surface temperature sensor circuit (201) and the IGBT temperature sensor circuit (202) outside, and is used for detecting the furnace surface temperature and the IGBT temperature.

3. The integrated circuit for an induction cooktop as claimed in claim 1, characterized in that The IGBT control circuit (104) is connected with the IGBT drive circuit (203) outside.

4. The integrated circuit of claim 1, wherein, The power conversion circuit (109) is connected with the power rectification input circuit (208), filter capacitor and power transformer circuit (209) outside.

5. The integrated circuit of claim 1, wherein, The output end of the power stabilizing circuit (110) is connected with the main control chip (101) and multiple sampling and control sub-circuits, and is used for providing working power supply for the main control chip (101) and multiple sampling and control sub-circuits.

6. The integrated circuit of claim 1, wherein, The current detection circuit (107) is connected with the current sampling circuit (206) outside.

7. The electromagnetic induction cooking hob integrated circuit according to claim 1, characterized in that, The alternating current voltage and zero-crossing detection circuit (106) is connected with the alternating current voltage sampling circuit (205) outside.

8. The integrated circuit of claim 1, wherein, The synchronization and back pressure detection circuit (105) is connected with the synchronization signal circuit (204) outside.

9. The electromagnetic induction cooking hob integrated circuit according to claim 1, characterized in that, The communication interface circuit (108) is connected with the communication interface terminal (207) outside, and is used for realizing communication between the main control chip and the display and key panel.

10. The integrated circuit of claim 1, wherein, The electromagnetic oven integrated circuit further includes the fan and buzzer control circuit (111) connected with the main control chip (101), and the fan and buzzer control circuit (111) is connected with the fan and buzzer circuit (210) outside.

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