A half-bridge induction cooker circuit

Abstract

A kind of half-bridge electromagnetic oven circuit, including master unit U4, still including the drive circuit being connected with the master unit U4, the drive circuit is connected with IGBT1 tube and IGBT2 tube, the drive circuit receives the driving signal of the master unit U4, and IGBT1 tube and IGBT2 tube are driven alternately to make heat disc work, the present application adopts the half-bridge control scheme not applied to electromagnetic oven in market at present, compared with traditional scheme circuit, half-bridge scheme uses two-way IGBT to work alternately, avoids high back pressure problem, and failure rate is low, simultaneously, also makes half-bridge electromagnetic oven can with low power continuous output, provides better cooking experience.

Description

Technical Field

[0001] This utility model relates to the field of induction cookers, and in particular to a half-bridge induction cooker circuit. Background Technology

[0002] Induction cookers utilize the principle of magnetic field induction eddy current heating to directly heat cookware, achieving an energy conversion efficiency of 80%–90%. Their popularity stems from their flameless operation, high efficiency, and portability. However, traditional induction cookers, operating at a high peak voltage of 1200V, are prone to interference and explosions. Furthermore, their limited IGBT operating characteristics prevent them from achieving continuous low-power heating, significantly diminishing the user's cooking experience.

[0003] Therefore, with the continuous evolution of products and increasingly higher user demands, product reliability and user experience have become the directions for changes in induction cookers.

[0004] Traditional induction cookers are driven by a single IGBT. Due to the operating characteristics of the IGBT, the heat generated by the IGBT increases sharply when the output power is low. Since the heat dissipation system cannot be expanded indefinitely, the IGBT is prone to overheating, exceeding its operating limits and leading to the risk of explosion. At the same time, because the peak voltage of the IGBT is as high as 1200V, it is highly susceptible to interference. Once there is external interference signal, the IGBT can easily exceed its peak voltage limit, resulting in explosion. Utility Model Content

[0005] To solve the above problems, this technical solution provides a half-bridge induction cooker circuit.

[0006] To achieve the above objectives, the technical solution is as follows:

[0007] A half-bridge induction cooker circuit includes a main control unit U4 and a drive circuit connected to the main control unit U4. The drive circuit is connected to IGBT1 and IGBT2. The drive circuit receives the drive signal from the main control unit U4 and alternately drives IGBT1 and IGBT2 to make the heating plate work.

[0008] In some embodiments, the driving circuit includes;

[0009] The driving unit U1 has its first input terminal connected to the main control unit U4 through resistor R25, its first output terminal connected to the base of the IGBT1 transistor, its collector connected to the power supply terminal, and its emitter grounded through resistors R13 and R19.

[0010] The second input terminal of the driving unit U1 is connected to the main control unit U4 through resistor R20. The second output terminal of the driving unit U1 is connected to the base of the IGBT2 transistor. The collector of the IGBT2 transistor is connected to the power supply terminal through resistors R5 and R8. The emitter is grounded through resistor R13.

[0011] In some embodiments, a data acquisition circuit is also included, which includes a transformer CT1, one end of the first coil of the transformer CT1 being connected to a power supply terminal and the other end being connected to the resistor R13;

[0012] A capacitor C11, a resistor R24, and a resistor R26 are respectively provided between the two ends of the second coil of the transformer CT1. A resistor R31 and a resistor R32 are also connected between the two ends. One end of the resistor R31 is connected to the main control unit U4 through a resistor R34, and the other end is grounded. One end of the resistor R32 is connected to the main control unit U4 through a resistor R35, and the other end is grounded.

[0013] In some embodiments, a thermistor RT1 for detecting IGBT1 is also included, one end of which is connected to a voltage via resistor R44, the other end of which is grounded, and one end of which is also connected to the main control unit U4.

[0014] In some embodiments, the system further includes terminals FAN1 and FAN2 for connecting a fan. One end of terminal FAN1 is connected to a voltage source, and the other end is connected to the collector of transistor Q3. The emitter is grounded, and the base is connected to the main control unit U4. One end of terminal FAN2 is connected to a voltage source, and the other end is connected to the collector of transistor Q3.

[0015] The beneficial effects of this application are:

[0016] This application adopts a half-bridge control scheme that is not currently used in induction cookers. Compared with traditional circuit schemes, the half-bridge scheme uses two IGBTs to work alternately, avoiding the problem of high reverse voltage and resulting in a low failure rate. At the same time, it also enables the half-bridge induction cooker to continuously output low power, providing a better cooking experience. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the block structure of an embodiment of the present utility model;

[0019] Figure 2 This is a structural schematic diagram of an embodiment of the present utility model. Detailed Implementation

[0020] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] Please refer to Figure 1-2 As shown, a half-bridge induction cooker circuit includes a main control unit U4 and a drive circuit connected to the main control unit U4. The drive circuit is connected to IGBT1 and IGBT2. The drive circuit receives the drive signal from the main control unit U4 and alternately drives IGBT1 and IGBT2 to make the heating plate work.

[0022] This utility model provides a half-bridge induction cooker solution. The input voltage powers the microcontroller through the power supply circuit. The microcontroller detects signals from the peripheral circuit, outputs complementary drive signals, controls the upper and lower IGBTs to work alternately, and tracks signal feedback in real time to adjust the output to achieve the best working state.

[0023] The circuit uses an HT45F0075 microcontroller, which is powered by a power supply circuit. The microcontroller detects external input signals and controls the upper IGBT and the lower IGBT to work alternately, and tracks the signal feedback in real time. This process is repeated to form a closed loop.

[0024] The circuit operation process of this utility model is as follows: After the microcontroller uses components such as R20, R25, R27, R28, C15, C16, and 2EDL05I06PF, it controls IGBT1 and IGBT2 to work alternately. By judging the feedback circuit signal composed of components such as CT1, C11, R24, R26, R31, R32, R34, R35, R37, R38, D5, D6, D7, D8, C27, and C28, it performs power compensation output control. This process is repeated to achieve stable power output.

[0025] This invention utilizes a microcontroller of model HT45F0075 and uses complementary PWM signals to enable two IGBTs to work alternately, avoiding the problem of high reverse voltage and resulting in a low failure rate. At the same time, it also enables the half-bridge induction cooker to continuously output low power, providing a better cooking experience.

[0026] In this embodiment, the driving circuit includes;

[0027] The driving unit U1 has its first input terminal connected to the main control unit U4 through resistor R25, its first output terminal connected to the base of the IGBT1 transistor, its collector connected to the power supply terminal, and its emitter grounded through resistors R13 and R19.

[0028] The second input terminal of the driving unit U1 is connected to the main control unit U4 through resistor R20. The second output terminal of the driving unit U1 is connected to the base of the IGBT2 transistor. The collector of the IGBT2 transistor is connected to the power supply terminal through resistors R5 and R8. The emitter is grounded through resistor R13.

[0029] The main control unit U4 sends a signal to the drive unit U1, so that the drive unit U1 sends a signal to the corresponding IGBT tube to turn it on, thereby starting the corresponding operation. Then, the signals are sent alternately, causing the two IGBT tubes to work alternately.

[0030] In this embodiment, a data acquisition circuit is also included, which includes a transformer CT1. One end of the first coil of the transformer CT1 is connected to the power supply terminal, and the other end is connected to the resistor R13.

[0031] A capacitor C11, a resistor R24, and a resistor R26 are respectively provided between the two ends of the second coil of the transformer CT1. Resistors R31 and R32 are also connected between the two ends. One end of resistor R31 is connected to the main control unit U4 through resistor R34, and the other end is grounded. One end of resistor R32 is connected to the main control unit U4 through resistor R35, and the other end is grounded. The input signal is fed back, and then power compensation output control is performed.

[0032] In this embodiment, a thermistor RT1 for detecting the IGBT1 is also included. One end of RT1 is connected to a voltage source through a resistor R44, and the other end is grounded. One end of RT1 is also connected to the main control unit U4. The voltage received by the main control unit changes according to the temperature change of the IGBT, thereby detecting the current temperature of the IGBT.

[0033] In this embodiment, the device also includes terminals FAN1 and FAN2 for connecting the fan. One end of terminal FAN1 is connected to a voltage source, and the other end is connected to the collector of transistor Q3. The emitter is grounded, and the base is connected to the main control unit U4. One end of terminal FAN2 is connected to a voltage source, and the other end is connected to the collector of transistor Q3. After a signal is sent to turn on the transistor, the terminal is energized to power the fan and turn it on.

[0034] The above description is only a preferred embodiment of this application and is not intended to limit the scope of implementation of this application. Any other embodiments whose principles and basic structures are the same as or similar to those of this application are within the protection scope of this application.

Claims

1. A half-bridge induction hob circuit, characterized in that, It includes a main control unit U4 and a drive circuit connected to the main control unit U4. The drive circuit is connected to IGBT1 and IGBT2. The drive circuit receives the drive signal from the main control unit U4 and alternately drives IGBT1 and IGBT2 to make the heating plate work.

2. A half-bridge electromagnetic hob circuit according to claim 1, characterized in that: The driving circuit includes; The driving unit U1 has its first input terminal connected to the main control unit U4 through resistor R25, its first output terminal connected to the base of the IGBT1 transistor, its collector connected to the power supply terminal, and its emitter grounded through resistors R13 and R19. The second input terminal of the driving unit U1 is connected to the main control unit U4 through resistor R20. The second output terminal of the driving unit U1 is connected to the base of the IGBT2 transistor. The collector of the IGBT2 transistor is connected to the power supply terminal through resistors R5 and R8. The emitter is grounded through resistor R13.

3. A half bridge electromagnetic hob circuit according to claim 2, characterised in that: It also includes a data acquisition circuit, which includes a transformer CT1, one end of the first coil of the transformer CT1 is connected to the power supply terminal, and the other end is connected to the resistor R13; A capacitor C11, a resistor R24, and a resistor R26 are respectively provided between the two ends of the second coil of the transformer CT1. A resistor R31 and a resistor R32 are also connected between the two ends. One end of the resistor R31 is connected to the main control unit U4 through a resistor R34, and the other end is grounded. One end of the resistor R32 is connected to the main control unit U4 through a resistor R35, and the other end is grounded.

4. A half bridge electromagnetic hob circuit according to claim 1, characterized in that: It also includes a thermistor RT1 for detecting IGBT1 transistors, one end of which is connected to a voltage via resistor R44, the other end of which is grounded, and one end of which is also connected to the main control unit U4.

5. A half bridge electromagnetic hob circuit as claimed in claim 1, characterized in that: It also includes terminals FAN1 and FAN2 for connecting the fan. One end of terminal FAN1 is connected to the voltage, and the other end is connected to the collector of transistor Q3. The emitter is grounded, and the base is connected to the main control unit U4. One end of terminal FAN2 is connected to the voltage, and the other end is connected to the collector of transistor Q3.

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