Bidirectional anti-interference electric stove

Abstract

The utility model relates to the technical field of electric range especially a two -way anti -interference electric fire range, including power cord, filter circuit and control module, the filter circuit includes three -stage filter and two -stage filter, power cord input electric end, three -stage filter and two -stage filter are electrically connected in proper order, be equipped with electric reactor on the L line of power cord, and control module input and two -stage filter output are electrically connected with electric reactor respectively. Power cord, three -stage filter and two -stage filter are electrically connected in proper order, can through the step -by -step filtering effect of three -stage filter and two -stage filter, step -by -step filter out the electromagnetic interference of power grid input, reduce the interference signal and enter subsequent control module. The electric reactor of setting up on the L line of power cord, on one hand can further restrain the differential mode and common mode interference of power grid side, on the other hand its electric connection design of control module input, two -stage filter output respectively, can block the interference of two -stage filter not completely filtered and conduct to control module, guarantee control module power supply stability.

Description

Technical Field

[0001] This utility model relates to the technical field of electric stoves, specifically to a bidirectional anti-interference electric stove. Background Technology

[0002] Electric stoves generate heating flames through a plasma flame device (driven by a high-voltage boost circuit), eliminating the need for gas throughout the process and thus removing the safety hazards of traditional gas stoves such as gas leaks, backfires, and carbon monoxide poisoning. Furthermore, when equipped with a sensor control unit (such as a flame sensor and a temperature sensor), it can monitor the flame status and pot temperature in real time. It can quickly cut off the high-voltage power supply when the pot is dry-burning or there is no flame, further reducing usage risks and meeting the safety needs of various scenarios, including home and commercial kitchens.

[0003] EMC (Electromagnetic Compatibility) testing is a core standard for measuring the electromagnetic interference (EMI) and electromagnetic interference immunity (EMS) of electronic and electrical equipment. Electric stoves are complex devices containing high-voltage systems and high-frequency switching components. During use, electric stoves are subject to various types of external electromagnetic interference. If their immunity is insufficient, it can easily lead to performance failures. In addition, electric stoves can also interfere with surrounding electronic equipment. Therefore, optimizing existing electric stoves based on EMC testing is the key to ensuring their own performance and the safety of surrounding equipment. Utility Model Content

[0004] This invention proposes a bidirectional anti-interference electric stove, which improves the bidirectional anti-interference performance of the electric stove by adding electrical components such as a three-stage filter to the existing electric stove.

[0005] A bidirectional anti-interference electric stove designed for this purpose includes a power line, a filter circuit, and a control module. The filter circuit includes a three-stage filter and a two-stage filter. The power line input terminal, the three-stage filter, and the two-stage filter are electrically connected in sequence. A reactor is provided on the L-line of the power line. The input terminal of the control module and the output terminal of the two-stage filter are respectively electrically connected to the reactor.

[0006] The third-stage filter and the second-stage filter are integrated on the same circuit board, or the third-stage filter and the second-stage filter are independently set on different circuit boards.

[0007] The three-stage filter includes a first-stage filter group, a second-stage filter group, and a third-stage filter group, wherein the third-stage filter group is provided with a varistor electrically connected thereto; The first-stage filter group includes a 2uF first-stage safety capacitor, and the second-stage filter group includes a 472m / 400V Y capacitor and a 10D471k varistor.

[0008] The secondary filter includes a magnetic ring choke assembly, a pre-stage filter group, and a post-stage filter group; The magnetic ring choke assembly includes a magnetic ring and a power line wound around the magnetic ring at least 8 times; The pre-stage filter group includes a 2uF pre-stage safety capacitor, and the post-stage filter group includes a 25mH post-stage common-mode inductor.

[0009] The bidirectional anti-interference electric stove also includes an auxiliary power supply and a central control unit, and the control module, the central control unit and the auxiliary power supply are electrically connected to each other; The auxiliary power supply includes a rectifier circuit, a voltage regulator and filter unit, and an output interface. A first inductor is provided between the output terminal of the rectifier circuit and the voltage regulator and filter unit; a second inductor is provided between the voltage regulator and filter unit and the output interface. The first inductor is used to filter high-frequency switching noise to reduce current ripple, and the second inductor is used as a low-pass filter to block high-frequency signals from being transmitted outward. The inductance values ​​of both the first and second inductors are 100uH.

[0010] The auxiliary power supply is equipped with a MOSFET, the driving resistor of which is 100R, and a 100pF capacitor is connected in parallel to the DS pin of the MOSFET.

[0011] The auxiliary power supply's AC power supply terminal is equipped with a filter inductor, which has a value of 100uH.

[0012] The bidirectional anti-interference electric stove also includes a high-voltage power module, and the output terminals of the control module and the central control unit are electrically connected to the input terminal of the high-voltage power module; The high-voltage power module includes diode D1, transistor Q1, IGBT, and a drive resistor electrically connected to the IGBT; The pins of diode D1 and / or transistor Q1 are respectively fitted with ferrite beads to absorb high-frequency interference conducted through the pins. The IGBT is connected in parallel with a 100pF snubber capacitor, which is used to absorb the surge voltage generated when the IGBT is switched.

[0013] The driving resistor is 33R.

[0014] The bidirectional anti-interference electric stove also includes a high-voltage boost circuit and a plasma flame device, with the output of the high-voltage power module electrically connected to the high-voltage boost circuit. The plasma flame device includes a high-voltage electrode and a grounding electrode. The high-voltage electrode is used to release high-frequency high voltage and form a strong electric field with the grounding electrode. The output terminal of the high-voltage boost circuit is electrically connected to the high-voltage electrode to provide the high-frequency voltage required for the strong electric field, so as to meet the energy output and circuit conduction of the plasma flame device.

[0015] The power lines at both the input and output terminals of the high-voltage transformer in the high-voltage boost circuit are fitted with magnetic clips.

[0016] The bidirectional anti-interference electric stove also includes a sensor control unit, which is electrically connected to the central control unit.

[0017] The beneficial technical effects of this utility model are as follows: The power supply line, the third-stage filter, and the second-stage filter are electrically connected in sequence. Through the successive filtering effect of the third-stage and second-stage filters, electromagnetic interference from the mains input is gradually filtered out, reducing the amount of interference signals entering the subsequent control module. The reactor installed on the L-line of the power supply line further suppresses differential-mode and common-mode interference from the mains side. Furthermore, its design of being electrically connected to the input terminal of the control module and the output terminal of the second-stage filter respectively can prevent interference not completely filtered out by the second-stage filter from being conducted to the control module, ensuring stable power supply to the control module.

[0018] Furthermore, through the aforementioned overall structural improvements, the applicant has completed laboratory testing for all nine tests: conducted immunity test, harmonic test, voltage flicker test, clatter test, electrostatic discharge immunity test, electrical fast transient / burst immunity test, surge (impulse) immunity test, radio frequency conducted (injected current) immunity test, and voltage sag and short-term interruption immunity test. The test structure meets expectations and is within the standard range. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an electric stove control circuit according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of a three-stage filter according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of a two-stage filter according to an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the control circuit board structure of the auxiliary power supply according to an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the magnetic snap fastening structure according to an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the magnetic snap opening structure according to an embodiment of the present invention. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. In order to make the above-mentioned objects, features and advantages of the present application more apparent and understandable, many specific details are set forth in the following description in order to provide a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0026] See Figures 1-6 A bidirectional anti-interference electric stove includes a power line 1, a filter circuit 2, and a control module 3. The filter circuit 2 includes a three-stage filter 201 and a two-stage filter 202. The input terminal of the power line 1, the three-stage filter 201, and the two-stage filter 202 are connected in sequence. A reactor is provided on the L line of the power line 1. The input terminal of the control module and the output terminal of the two-stage filter 202 are respectively connected to the reactor.

[0027] Power line 1, the third-stage filter 201, and the second-stage filter 202 are sequentially connected electrically. Through the step-by-step filtering effect of the third-stage filter 201 and the second-stage filter 202, electromagnetic interference from the mains input is gradually filtered out, reducing the amount of interference signals entering the subsequent control module 3. The reactor installed on the L-line of power line 1 further suppresses differential-mode and common-mode interference from the mains side. Furthermore, its design, with electrical connections to the input terminal of control module 3 and the output terminal of second-stage filter 202 respectively, prevents interference not completely filtered out by second-stage filter 202 from being conducted to control module 3, ensuring stable power supply to control module 3. The overall design effectively improves the electromagnetic interference resistance of the electric stove control circuit, reduces performance failures caused by interference, and lowers the electromagnetic radiation emitted by the electric stove, meeting EMC testing standards and ensuring the safety of its own operation and surrounding equipment.

[0028] The third-level filter 201 and the second-level filter 202 are integrated on the same circuit board 4, or the third-level filter 201 and the second-level filter 202 are independently set on different circuit boards 4.

[0029] The three-stage filter 201 includes a first-stage filter group 203, a second-stage filter group 204 and a third-stage filter group 205, wherein the third-stage filter group 205 is provided with a varistor 5 electrically connected thereto. The first-stage filter group 203 includes a 2uF first-stage safety capacitor, the second-stage filter group 204 includes a 472m / 400V Y capacitor, and the varistor 5 is a 10D471kΩ.

[0030] The first-stage filter group 203, the second-stage filter group 204, and the third-stage filter group 205 in the three-stage filter 201 form a multi-stage progressive filtering structure, gradually enhancing the filtering capability against power grid interference, reducing the residual interference signals of different frequency bands, and providing cleaner power to subsequent circuits. The varistor 5 connected to the third-stage filter group 205 can quickly respond to overvoltage in the power grid, absorbing overvoltage energy and preventing damage to the three-stage filter 201 and subsequent components such as the control module 3 and auxiliary power supply 6, thus extending the overall lifespan of the circuit. Simultaneously, the combination of multi-stage filtering and overvoltage protection improves the operational stability of the electric stove under power grid voltage fluctuations, reduces downtime caused by overvoltage or interference, and ensures continuous operation.

[0031] The secondary filter 202 includes a magnetic ring choke assembly 206, a pre-stage filter group 207, and a post-stage filter group 208. The magnetic ring choke assembly 206 includes a magnetic ring and a power line wound around the magnetic ring at least 8 times. The pre-stage filter group 207 includes a 2uF pre-stage safety capacitor, and the post-stage filter group 208 includes a 25mH post-stage common-mode inductor.

[0032] The magnetic ring choke assembly 206 in the secondary filter 202, through its interaction with the wound power line and the design of the power line winding around the magnetic ring at least 8 times, enhances the suppression of common-mode interference and hinders the transmission of common-mode interference signals. The pre-stage filter group 207 performs preliminary filtering on the power energy processed by the tertiary filter 201, further removing residual interference; the post-stage common-mode inductor in the post-stage filter group 208 specifically filters out common-mode interference. The three work together to form a complete secondary filter circuit, significantly reducing the probability of interference signals entering the control module 3. This design improves the stability of the control module 3, reduces control command deviations caused by interference, and reduces electromagnetic radiation interference from the electric stove, meeting the dual requirements of anti-interference and low radiation in EMC testing.

[0033] The bidirectional anti-interference electric stove also includes an auxiliary power supply 6 and a central control unit 7. The control module 3, the central control unit 7 and the auxiliary power supply 6 are electrically connected to each other. The auxiliary power supply 6 includes a rectifier circuit, a voltage regulator and filter unit, and an output interface. A first inductor 8 is provided between the output terminal of the rectifier circuit and the voltage regulator and filter unit; a second inductor 9 is provided between the voltage regulator and filter unit and the output interface. The first inductor 8 is used to filter high-frequency switching noise to reduce current ripple, and the second inductor 9 is used as a low-pass filter to block high-frequency signals from being transmitted outward. The inductance values ​​of both the first inductor 8 and the second inductor 9 are 100uH.

[0034] The electrical connection between the auxiliary power supply 6, control module 3, and central control unit 7 allows the auxiliary power supply 6 to provide stable power to both the control module 3 and the central control unit 7, preventing control failures due to unstable power supply. In the auxiliary power supply 6, the first inductor 8 between the rectifier circuit and the voltage regulator unit filters out high-frequency switching noise in the rectified power, reducing current ripple and making the input to the voltage regulator unit smoother, thus improving voltage regulation. The second inductor 9 between the voltage regulator unit and the output interface prevents high-frequency signals generated inside the auxiliary power supply 6 from being transmitted outwards, avoiding interference with other modules of the electric stove. This stable power supply and anti-interference design allows the central control unit 7 to accurately coordinate the operation of the control module 3, improving the overall operational stability of the electric stove and reducing malfunctions caused by power supply problems.

[0035] The auxiliary power supply 6 is equipped with a MOSFET, which has a 100Ω drive resistor, and a 100pF capacitor is connected in parallel to the MOSFET's drain and source pins. The voltage regulation and filtering unit is the core module in the DC power supply that converts pulsating DC power into stable DC power. It mainly consists of a filter circuit and a voltage regulator circuit. The voltage regulator circuit comprises components such as a Zener diode, a three-terminal regulator (e.g., LM7805), a transistor, and a capacitor. The filter circuit consists of a capacitor and an inductor.

[0036] The MOSFET on the auxiliary power supply 6, paired with a drive resistor and a capacitor connected in parallel to the DS pin, optimizes the switching characteristics of the MOSFET. The drive resistor adjusts the switching speed of the MOSFET, reducing high-frequency spike interference generated during switching. The parallel capacitor absorbs high-frequency noise between the MOSFET's DS pins, preventing noise from being conducted to the control module 3 or the central control unit 7 through the power supply lines of the auxiliary power supply 6. This design reduces electromagnetic interference generated by the MOSFET during operation, ensuring the purity of the output power from the auxiliary power supply 6, thereby maintaining the stable operation of the control module 3 and the central control unit 7. Simultaneously, it reduces the electromagnetic radiation emitted by the auxiliary power supply 6, meeting EMC testing requirements and preventing interference with surrounding electronic equipment.

[0037] The auxiliary power supply 6 has a filter inductor at its AC power supply terminal, and the filter inductor is 100uH.

[0038] The filter inductor installed at the AC power supply terminal of auxiliary power supply 6 filters out high-frequency interference signals before the mains power enters the auxiliary power supply 6, preventing interference signals from entering the rectifier circuit and voltage regulation filter unit of auxiliary power supply 6, and preventing interference from affecting rectification efficiency and voltage regulation effect. Clean input power makes the rectification and voltage regulation process of auxiliary power supply 6 more stable, reduces output voltage fluctuations, and provides a more reliable power supply for control module 3 and central control unit 7. At the same time, the filter inductor reduces the impact of mains interference on the components of auxiliary power supply 6 itself, extending the service life of auxiliary power supply 6.

[0039] The auxiliary power supply 6 limits the existing power circuit board, and its specific electrical components will not be described in detail.

[0040] The bidirectional anti-interference electric stove also includes a high-voltage power module 10, and the output terminals of the control module 3 and the central control unit 7 are electrically connected to the input terminal of the high-voltage power module 10. The high-voltage power module 10 includes a diode D1, a transistor Q1, an IGBT, and a drive resistor electrically connected to the IGBT; The pins of diode D1 and / or transistor Q1 are respectively fitted with ferrite beads to absorb high-frequency interference conducted through the pins. The IGBT is connected in parallel with a 100pF snubber capacitor, which is used to absorb the surge voltage generated when the IGBT is switched.

[0041] After receiving the output signals from the control module 3 and the central control unit 7, the high-voltage power module 10 uses the ferrite bead fitted onto the pins of diode D1 and / or transistor Q1 to absorb high-frequency interference conducted through the pins, preventing interference from being conducted into the high-voltage power module 10 or spreading outwards. The parallel absorption capacitor of the IGBT absorbs the surge voltage generated when the IGBT switches, protecting the IGBT from overvoltage damage and extending its service life. The drive resistor optimizes the IGBT drive signal, ensuring stable switching. These three components work together to ensure the high-voltage power module 10 outputs a stable signal, providing a reliable input for the subsequent high-voltage boost circuit 11. Simultaneously, they reduce electromagnetic interference generated by the high-voltage power module 10 itself, preventing interference with other modules or peripheral equipment in the electric stove, meeting EMC requirements, and ensuring the stability and safety of the electric stove's high-voltage system.

[0042] The driving resistor is 33R.

[0043] The bidirectional anti-interference electric stove also includes a high-voltage boost circuit 11 and a plasma flame device 12, and the output terminal of the high-voltage power module 10 is electrically connected to the high-voltage boost circuit 11. The plasma flame device 12 includes a high-voltage electrode and a grounding electrode. The high-voltage electrode is used to release high-frequency high voltage and form a strong electric field with the grounding electrode. The output terminal of the high-voltage boost circuit 11 is electrically connected to the high-voltage electrode to provide the high-frequency voltage required for the strong electric field, so as to meet the energy output and circuit conduction of the plasma flame device.

[0044] The signal output from the high-voltage power module 10, after being processed by the high-voltage boost circuit 11, is converted into the high-frequency voltage required by the plasma flame device 12 and transmitted to the high-voltage electrode of the plasma flame device 12. The high-frequency high voltage released by the high-voltage electrode forms a strong electric field with the ground electrode, meeting the energy requirements and circuit continuity requirements for the plasma flame device 12 to generate a heating flame, ensuring stable flame output. Simultaneously, pre-filtering and anti-interference designs, such as the three-stage filter 201, the two-stage filter 202, and ferrite beads, reduce interference on the high-voltage boost circuit 11 and the plasma flame device 12, preventing abnormal flame generation such as flame instability or flameout, ensuring reliable heating function of the electric stove. Furthermore, the anti-interference design of the entire high-voltage system reduces external electromagnetic radiation, meets EMC testing standards, and ensures the safety of surrounding equipment.

[0045] The bidirectional anti-interference electric stove also includes a sensor control unit 13, which is electrically connected to the central control unit 7.

[0046] After the sensor control unit 13 is electrically connected to the central control unit 7, it can monitor the operating status of the electric stove in real time, such as the flame status and pot temperature, and transmit the monitoring information to the central control unit 7. After receiving the information, if the central control unit 7 detects abnormal conditions such as dry burning of an empty pot or no flame, it can quickly send a command to the control module 3, which will cut off the high-voltage power supply to prevent safety accidents such as pot burnout or circuit damage, further improving the safety of the electric stove. At the same time, the real-time feedback from the sensor control unit 13 allows the central control unit 7 to adjust the operating status of the control module 3 and the high-voltage power module 10 in a timely manner, ensuring that the electric stove operates under reasonable parameters, reducing circuit interference or malfunctions caused by abnormal conditions, and maintaining overall EMC performance stability.

[0047] The central control unit 7 is an MCU central processing unit, and its circuit diagram can be found in the MCU central processing unit circuit diagram disclosed in Chinese patent CN107702139A.

[0048] The high-voltage power module 10 and the high-voltage boost circuit 11 can also be found in the high-voltage drive unit circuit diagram disclosed in Chinese Patent CN107702139A.

[0049] The control module 3 includes a control chip mounted on a circuit board, which is also a commonly used control circuit board in existing electric stoves. The control module 3 is a purchased component of the applicant, and the applicant has not made any improvements to the control module 3, so it will not be described in detail here.

[0050] Power from the grid is input via power line 1 and first undergoes multi-stage filtering through a three-stage filter 201 and a two-stage filter 202. The three-stage filter 201 filters out interference step by step through the first-stage filter group 203, the second-stage filter group 204, and the third-stage filter group 205. The varistor 5 of the third-stage filter group 205 absorbs overvoltage. The two-stage filter 202 further suppresses common-mode interference and residual interference through the magnetic ring choke assembly 206, the pre-stage filter group 207, and the post-stage filter group 208. At the same time, the reactor on power line 1L blocks interference conduction. After rectification by the rectifier circuit, the auxiliary power supply 6 filters out high-frequency switching noise and reduces current ripple through the first inductor 8, then is regulated by the voltage regulator filter unit, and finally blocks high-frequency signal conduction through the second inductor 9, providing stable power supply for the control module 3 and the central control unit 7. The filter inductor at the AC power supply end of the auxiliary power supply 6 filters out grid interference, and the drive resistor and parallel capacitor of the MOSFET reduce switching interference.

[0051] After receiving power from the auxiliary power supply 6, the central control unit 7 works in conjunction with the control module 3 to output control signals to the high-voltage power module 10. In the high-voltage power module 10, the magnetic bead absorbs high-frequency interference from the diode D1 and transistor Q1 pins, the absorption capacitor protects the IGBT, and the drive resistor optimizes the IGBT drive signal, ensuring a stable output signal to the high-voltage boost circuit 11. The high-voltage boost circuit 11 boosts the signal to a high-frequency voltage, which is transmitted to the high-voltage electrode of the plasma flame device 12. The high-voltage electrode and the ground electrode form a strong electric field, generating a stable heating flame. Simultaneously, the sensor control unit 13 monitors the flame status, pot temperature, and other information in real time, transmitting this data to the central control unit 7. If the central control unit 7 detects an abnormality, it immediately cuts off the high-voltage power supply through the control module 3 to ensure safe operation.

[0052] The power lines at both the input and output terminals of the high-voltage transformer in the high-voltage boost circuit 11 are fitted with magnetic clips 14. The high-voltage transformer needs to boost the low-voltage electricity to several thousand or even tens of thousands of volts, and the process involves high-speed "switching actions," which directly generate strong high-frequency interference.

[0053] Without the magnetic clasp 14, these interferences could cause equipment malfunctions or even fail to meet national electromagnetic compatibility (EMC) certification standards, preventing it from leaving the factory normally.

[0054] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An electric stove, wherein the electric stove is a bidirectional anti-interference electric stove, the electric stove comprising a power cord (1), a filter circuit (2), and a control module (3), characterized in that: The filter circuit (2) includes a third-level filter (201) and a second-level filter (202). The power supply line (1) input terminal, the third-level filter (201) and the second-level filter (202) are connected in sequence. A reactor is provided on the L line of the power supply line (1). The control module input terminal and the output terminal of the second-level filter (202) are respectively connected to the reactor.

2. The electric stove according to claim 1, characterized in that: The third-level filter (201) and the second-level filter (202) are integrated on the same circuit board (4), or the third-level filter (201) and the second-level filter (202) are independently set on different circuit boards (4).

3. The electric stove according to claim 1, characterized in that: The three-stage filter (201) includes a first-stage filter group (203), a second-stage filter group (204) and a third-stage filter group (205), wherein the third-stage filter group (205) is provided with a varistor (5) electrically connected thereto. The first-stage filter group (203) includes a 2uF first-stage safety capacitor, the second-stage filter group (204) includes a 472m / 400V Y capacitor, and the varistor (5) is 10D471k.

4. The electric stove according to claim 1, characterized in that: The secondary filter (202) includes a magnetic ring choke assembly (206), a pre-stage filter group (207), and a post-stage filter group (208). The magnetic ring choke assembly (206) includes a magnetic ring and a power line wound around the magnetic ring at least 8 times; The pre-stage filter group (207) includes a 2uF pre-stage safety capacitor, and the post-stage filter group (208) includes a 25mH post-stage common-mode inductor.

5. The electric stove according to claim 1, characterized in that: It also includes an auxiliary power supply (6) and a central control unit (7), and the control module (3), the central control unit (7) and the auxiliary power supply (6) are electrically connected to each other; The auxiliary power supply (6) includes a rectifier circuit, a voltage regulator and filter unit and an output interface. A first inductor (8) is provided between the output end of the rectifier circuit and the voltage regulator and filter unit; a second inductor (9) is provided between the voltage regulator and filter unit and the output interface. The first inductor (8) is used to filter high-frequency switching noise to reduce current ripple, and the second inductor (9) is used as a low-pass filter to block high-frequency signals from being transmitted outward. The inductance values ​​of the first inductor (8) and the second inductor (9) are both 100uH.

6. The electric stove according to claim 5, characterized in that: The auxiliary power supply (6) is equipped with a MOS transistor, the driving resistor of the MOS transistor is 100R, and a 100pF capacitor is connected in parallel to the DS pin of the MOS transistor.

7. The electric stove according to claim 5, characterized in that: The auxiliary power supply (6) has a filter inductor at its AC power supply terminal, and the filter inductor is 100uH.

8. The electric stove according to claim 5, characterized in that: It also includes a high-voltage power module (10), a control module (3), and a central control unit (7), the outputs of which are electrically connected to the input of the high-voltage power module (10); The high-voltage power module (10) includes a diode D1, a transistor Q1, an IGBT, and a drive resistor electrically connected to the IGBT; The pins of diode D1 and / or transistor Q1 are respectively fitted with ferrite beads to absorb high-frequency interference conducted through the pins. The IGBT is connected in parallel with a snubber capacitor with a capacitance of 100pF, which is used to absorb the surge voltage generated when the IGBT is switched. The driving resistor is 33R.

9. The electric stove according to claim 8, characterized in that: It also includes a high-voltage boost circuit (11) and a plasma flame device (12), with the output of the high-voltage power module (10) electrically connected to the high-voltage boost circuit (11); The plasma flame device (12) includes a high-voltage electrode and a grounding electrode. The high-voltage electrode is used to release high-frequency high voltage and form a strong electric field with the grounding electrode. The output terminal of the high-voltage boost circuit (11) is electrically connected to the high-voltage electrode to provide the high-frequency voltage required for the strong electric field, so as to satisfy the energy output and circuit conduction of the plasma flame device. The power lines of the high voltage transformer input and output terminals of the high voltage boost circuit (11) are fitted with magnetic buckles (14).

10. The electric stove according to claim 9, characterized in that: It also includes a sensor control unit (13), which is electrically connected to the central control unit (7).

Images