An electromagnetic oven with power identification control technology

Abstract

The utility model relates to the technical field of electromagnetic oven discloses an electromagnetic oven with power identification control technology, including the shell, the inside of shell is provided with power identification control module, power identification control module includes power identification unit and power control unit, power identification unit includes with the current monitoring circuit and voltage monitoring circuit of main control chip connection, power control unit includes main control chip connection's oscillation circuit, excitation circuit and pulse width modulation circuit. Realize real -time, dynamic monitoring and feedback control to heating power, flexible adjustment heating power, ensure that power response speed is fast, error rate is low, through the integration design of oscillation circuit and excitation circuit, oscillation circuit can automatic adjustment oscillation frequency, realize fast response, and excitation circuit realizes IGBT's conduction and cut -off according to the pulse of oscillation circuit output, ensures that power switch is accurate, reduces equipment power consumption.

Description

Technical Field

[0001] This utility model relates to the field of induction cooker technology, specifically to an induction cooker with power identification and control technology. Background Technology

[0002] An induction cooker is a kitchen heating device that uses the principle of electromagnetic induction to directly convert electrical energy into heat energy. Its core mechanism involves inducing eddy currents in the bottom of a ferromagnetic cookware using a high-frequency alternating magnetic field, causing the cookware itself to heat up and thus heating the food.

[0003] A search revealed that patent application number CN201010122925.5 discloses an induction cooker device with convenient power adjustment, belonging to the field of induction cooker control technology. It includes a panel, a main control circuit, a display circuit, and a heating circuit controlled by the main control circuit. It also includes a control area and display module for convenient user adjustment. The control area is located on the panel, and the capacitive touch electrodes are made of carbon film. One side of the carbon film is formed using carbon printing technology, and the other side has copper foil traces connected to the main control circuit. The display module includes LED and digital tube displays, and is connected to the main control circuit to display the working status of the induction cooker. This invention's induction cooker control device has no blind spots, eliminates erroneous operations, ensures operational reliability, and offers more sensitive operation, faster recognition speed, and higher accuracy. Its electrode materials can save more than two-thirds of the cost compared to existing technologies.

[0004] Traditional induction cookers have a simple power regulation mechanism and lack real-time monitoring capabilities, resulting in large fluctuations in heating power and low heating efficiency. Therefore, we need to propose an induction cooker with power identification and control technology. Utility Model Content

[0005] The purpose of this invention is to provide an induction cooker with power identification and control technology. Through the design of the power identification unit and the power control unit, the heating power can be monitored and controlled in real time and dynamically, and the heating power can be flexibly adjusted to ensure fast power response and low error rate, thereby improving cooking stability and energy efficiency and solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an induction cooker with power identification and control technology, comprising a shell and a panel fixed to the top of the shell, wherein a power identification and control module for identifying and controlling the heating power of the induction cooker is provided inside the shell, and a heat dissipation mechanism for dissipating heat from the internal components of the induction cooker is also provided inside the shell.

[0007] The power identification and control module includes a power identification unit and a power control unit. The power identification unit includes a current monitoring circuit and a voltage monitoring circuit connected to the main control chip. The power control unit includes an oscillation circuit, an excitation circuit, and a pulse width modulation circuit connected to the main control chip.

[0008] Preferably, the heat dissipation mechanism includes a fan rotatably installed inside the housing, an air inlet aligned with the fan is provided at the bottom of the housing, and a fan shroud is also provided inside the housing and installed around the fan.

[0009] Preferably, an air duct is installed inside the housing, the air duct is located on the side of the fan away from the fan cover, and an exhaust port is provided on the side of the housing near the air duct.

[0010] Preferably, the current monitoring circuit includes a chip U1 and a load connector PH2. Resistors R4 and R5 are connected between pin 1 of the chip U1 and pin 1 of the load connector PH2. Resistor R2 is connected between pin 3 of the chip U1 and pin 1 of the load connector PH2. Resistor R1 is connected between pin 3 and pin 4 of the chip U1. MOSFET Q2 is connected to pin 2 of the load connector PH2.

[0011] Preferably, the voltage monitoring circuit includes comparator U10A, comparator U10B, and voltage transformer L3. Pin 1 of voltage transformer L3 is connected in series with resistors R103 and R104. Pin 2 of voltage transformer L3 is connected in series with resistors R105 and R106. Pin 3 of voltage transformer L3 is connected to pin 3 of comparator U10A. Pin 4 of voltage transformer L3 is connected to pin 2 of comparator U10A. Pin 3 of comparator U10A is connected to pin 7 of comparator U10B.

[0012] Preferably, the oscillation circuit includes a comparator U2D, and pin 10 of the comparator U2D is connected to a capacitor C16 and a diode D6 and a resistor R20 connected in parallel.

[0013] Preferably, the excitation circuit includes a comparator U2C, a transistor Q1, and a transistor Q4. The bases of transistor Q1 and Q4 are both connected to the output terminal of the comparator U2C, and the emitter of transistor Q1 is connected to the collector of transistor Q4.

[0014] The pulse width modulation circuit includes resistors R30, R31, and R34 connected in series, and capacitors C27, R32, C28, and C29 connected in parallel. Resistor R31 is connected between capacitor C27 and resistor R32, and resistor R34 is connected between capacitor C28 and capacitor C29.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model, through the design of a power identification unit and a power control unit, realizes real-time and dynamic monitoring and feedback control of heating power, flexibly adjusts heating power, ensures fast power response speed and low error rate, and improves cooking stability and energy efficiency;

[0017] 2. This utility model integrates the oscillation circuit and the excitation circuit. The oscillation circuit can automatically adjust the oscillation frequency to achieve a fast response. The excitation circuit realizes the conduction and cutoff of the IGBT according to the pulse output by the oscillation circuit, ensuring accurate power switching and reducing equipment power consumption. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the bottom structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0021] Figure 4 This is a circuit diagram of the current monitoring circuit of this utility model;

[0022] Figure 5 This is a circuit diagram of the voltage monitoring circuit of this utility model;

[0023] Figure 6 This is a circuit diagram of the oscillation circuit of this utility model;

[0024] Figure 7 This is a circuit diagram of the excitation circuit of this utility model;

[0025] Figure 8 This is a circuit diagram of the pulse width modulation circuit of this utility model.

[0026] In the diagram: 1. Outer shell; 2. Panel; 3. Air inlet; 4. Fan; 5. Fan cover; 6. Air duct; 7. Exhaust vent. Detailed Implementation

[0027] 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.

[0028] Please see Figures 1-8The present invention provides a technical solution: an induction cooker with power identification and control technology, including a shell 1, a panel 2 fixed on the top of the shell 1, a power identification and control module for identifying and controlling the heating power of the induction cooker is provided inside the shell 1, and a heat dissipation mechanism for dissipating heat from the internal components of the induction cooker is also provided inside the shell 1.

[0029] The power identification and control module includes a power identification unit and a power control unit. The power identification unit includes a current monitoring circuit and a voltage monitoring circuit connected to the main control chip. The power control unit includes an oscillation circuit, an excitation circuit, and a pulse width modulation circuit connected to the main control chip.

[0030] The heat dissipation mechanism includes a fan 4 that is rotatably installed inside the housing 1. An air inlet 3 aligned with the fan 4 is provided at the bottom of the housing 1. A fan shroud 5 is also provided inside the housing 1 and installed around the fan 4.

[0031] An air duct 6 is installed inside the outer casing 1. The air duct 6 is located on the side of the fan 4 away from the fan cover 5. An exhaust port 7 is opened on the side of the outer casing 1 near the air duct 6.

[0032] When the fan 4 is running, it can draw cold air from outside into the interior of the casing 1. The cold airflow is guided to the air duct 6 with the help of the fan cover 5, and pushes the hot air inside the casing 1 out from the exhaust port 7.

[0033] The current monitoring circuit includes chip U1 and load connector PH2. Resistors R4 and R5 are connected between pin 1 of chip U1 and pin 1 of load connector PH2. Resistor R2 is connected between pin 3 of chip U1 and pin 1 of load connector PH2. Resistor R1 is connected between pin 3 and pin 4 of chip U1. MOSFET Q2 is connected to pin 2 of load connector PH2.

[0034] Chip U1 is an operational amplifier. Resistors (R1, R2, R4, R5, R7) are used to set the gain and bias parameters of the current monitoring circuit. MOSFET Q2 is used for power amplification or switching control. CTRL1 is the control signal input terminal, used to control the conduction and cutoff of MOSFET Q2.

[0035] The input signal enters from VOUT and is connected to the inverting input terminal (pin 3) of chip U1 through resistor R1. The non-inverting input terminal (pin 1) of chip U1 is grounded through resistor R7 to form a bias.

[0036] Chip U1 amplifies the input signal, and the output of chip U1 is used to control the conduction level of MOSFET Q2.

[0037] The voltage monitoring circuit includes comparator U10A, comparator U10B, and voltage transformer L3. Pin 1 of voltage transformer L3 is connected in series with resistors R103 and R104. Pin 2 of voltage transformer L3 is connected in series with resistors R105 and R106. Pin 3 of voltage transformer L3 is connected to pin 3 of comparator U10A, and pin 4 of voltage transformer L3 is connected to pin 2 of comparator U10A. Pin 3 of comparator U10A is connected to pin 7 of comparator U10B.

[0038] Pin 5 of comparator U10B is connected to resistors R100 and R101 respectively. Pin 7 of comparator U10B is connected in parallel with resistor R102 and capacitor C100. Pins 3 and 4 of comparator U10B are connected in parallel with diodes D24 and D25 and capacitor C102. Pins 1 and 2 of comparator U10A are connected in parallel with resistor R107, resistor R108 and capacitor C103 connected in series. Pin 1 of comparator U10A is connected to resistor R109 and diode D26.

[0039] The input signal is connected to pin 5 of comparator U10B via resistor R100. Comparator U10B amplifies the input signal, and the amplified signal is output from pin 7 of comparator U10B and connected to pin 1 of voltage transformer L3. Voltage transformer L3 isolates the input signal after voltage transformation. Diodes D24 and D25 convert the AC signal output from voltage transformer L3 into a DC signal. Capacitor C101 smooths the rectified DC signal to reduce ripple.

[0040] Then the DC signal enters pin 3 of comparator U10A, comparator U10A amplifies and processes the DC signal, and the processed signal is output from pin 1 of comparator U10A.

[0041] The oscillation circuit includes a comparator U2D, and pin 10 of the comparator U2D is connected to a capacitor C16 and a diode D6 and a resistor R20 connected in parallel.

[0042] When there is a voltage input at pin 11 of comparator U2D, V7 is off, and V5 equals the forward voltage drop of V6. When V5 < V6, V7 turns from off to on, V6 rises to the input voltage, and V5 charges capacitor C16 through resistor R20. When V5 > V6, V7 turns off, V6 drops to the forward voltage drop of diode D6, and V5 discharges through capacitor C16 and diode D6. When V5 discharges to a level less than V6, the above state is repeated, forming an oscillation.

[0043] The excitation circuit includes comparator U2C, transistors Q1 and Q4. The bases of transistors Q1 and Q4 are both connected to the output of comparator U2C, and the emitter of transistor Q1 is connected to the collector of transistor Q4. Pin 8 of comparator U2C is connected to a dipole resistor R21, a parallel resistor R22, and a capacitor C13. The output of comparator U2C is connected to a resistor R23, and capacitors C17 and C18 are connected in parallel to the collector of transistor Q1.

[0044] The oscillation circuit outputs a low-voltage pulse signal, which cannot directly control the saturation conduction and cutoff of the IGBT. The signal needs to be amplified by the excitation circuit. When V8 is off, V8 < V9, transistor Q1 is on, transistor Q4 is off, the gate of the IGBT is 0V, and the IGBT is off. When V8 is on, V8 > V9, Q1 is off, Q4 is on, and +18V is applied to the gate of the IGBT through resistor R23, the bases of transistors Q4 and Q1, and the IGBT is on.

[0045] The pulse width modulation circuit includes resistors R30, R31, and R34 connected in series, and capacitors C27, R32, C28, and C29 connected in parallel. Resistor R31 is connected between capacitor C27 and resistor R32, and resistor R34 is connected between capacitor C28 and capacitor C29.

[0046] The main control chip outputs PWM pulses to the integrating circuit composed of resistor R30, capacitor C27, and resistor R31. The wider the PWM pulse width, the higher the voltage of capacitor C28, and the higher the voltage of capacitor C29. The control voltage sent to the oscillation circuit increases with the increase of capacitor C29. The higher the voltage of the oscillation circuit, the longer V7 is in the on state, and the greater the heating power of the induction cooker, and vice versa.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An induction cooker with power identification and control technology, characterized in that: Includes a housing (1) and a panel (2) fixed to the top of the housing (1). The housing (1) is equipped with a power identification control module that identifies and controls the heating power of the induction cooker. The housing (1) is also equipped with a heat dissipation mechanism for heat dissipation of the internal components of the induction cooker. The power identification and control module includes a power identification unit and a power control unit. The power identification unit includes a current monitoring circuit and a voltage monitoring circuit connected to the main control chip. The power control unit includes an oscillation circuit, an excitation circuit, and a pulse width modulation circuit connected to the main control chip.

2. An induction cooker with power identification and control technology according to claim 1, characterized in that: The heat dissipation mechanism includes a fan (4) rotatably installed inside the housing (1), and an air inlet (3) aligned with the fan (4) is provided at the bottom of the housing (1). The housing (1) is also provided with a fan shroud (5) installed around the fan (4).

3. An induction cooker with power identification and control technology according to claim 2, characterized in that: The air duct (6) is installed inside the outer shell (1). The air duct (6) is located on the side of the fan (4) away from the shroud (5). An exhaust port (7) is opened on the side of the outer shell (1) near the air duct (6).

4. An induction cooker with power identification and control technology according to claim 1, characterized in that: The current monitoring circuit includes a chip U1 and a load connector PH2. Resistors R4 and R5 are connected between pin 1 of chip U1 and pin 1 of load connector PH2. Resistor R2 is connected between pin 3 of chip U1 and pin 1 of load connector PH2. Resistor R1 is connected between pin 3 and pin 4 of chip U1. MOSFET Q2 is connected to pin 2 of load connector PH2.

5. An induction cooker with power identification control technology according to claim 1, characterized in that: The voltage monitoring circuit includes comparator U10A, comparator U10B, and voltage transformer L3. Pin 1 of voltage transformer L3 is connected in series with resistors R103 and R104. Pin 2 of voltage transformer L3 is connected in series with resistors R105 and R106. Pin 3 of voltage transformer L3 is connected to pin 3 of comparator U10A. Pin 4 of voltage transformer L3 is connected to pin 2 of comparator U10A. Pin 3 of comparator U10A is connected to pin 7 of comparator U10B.

6. An induction cooker with power identification and control technology according to claim 1, characterized in that: The oscillation circuit includes a comparator U2D, and pin 10 of the comparator U2D is connected to a capacitor C16 and a diode D6 and a resistor R20 connected in parallel.

7. An induction cooker with power identification and control technology according to claim 1, characterized in that: The excitation circuit includes a comparator U2C, a transistor Q1, and a transistor Q4. The bases of transistor Q1 and Q4 are both connected to the output of comparator U2C, and the emitter of transistor Q1 is connected to the collector of transistor Q4.

8. An induction cooker with power identification control technology according to claim 1, characterized in that: The pulse width modulation circuit includes resistors R30, R31, and R34 connected in series, and capacitors C27, R32, C28, and C29 connected in parallel. Resistor R31 is connected between capacitor C27 and resistor R32, and resistor R34 is connected between capacitor C28 and capacitor C29.

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