A plasma stove with a single electrode controllable

Abstract

The present invention discloses a plasma stove with a controllable single electrode, which includes a base, at least one burner disposed on the base, and an electronic control unit. The burner includes a cookware support exposed above the base and a plurality of discharge electrodes located inside the cookware support. The burner further includes a high-voltage package disposed in the base. The high-voltage package includes a shielding housing and a plurality of micro-transformers hermetically disposed in the shielding housing. The input end of each micro-transformer is electrically connected to the electronic control unit and is individually controlled by the electronic control unit. The output end of each micro-transformer is electrically connected to one of the discharge electrodes. Each micro-transformer converts the low-voltage power input by the electronic control unit into high-voltage power and discharges through the discharge electrode electrically connected thereto. The present invention can individually control the on / off of each discharge electrode, thereby accurately controlling the heating effect of the plasma stove, and at the same time can effectively shield or suppress the electromagnetic radiation generated by the high-frequency high-voltage circuit in the plasma stove.

Description

Technical Field

[0001] The present invention relates to the technical field of cooking appliances, and particularly to a plasma stove with controllable single electrode. Background Art

[0002] Plasma, also called ionized gas, is an ionized gaseous substance composed of positive and negative ions formed by atoms and atomic groups after some electrons are deprived. It is a macroscopic electrically neutral ionized gas with a scale larger than the Debye length. Its motion is mainly governed by electromagnetic force and exhibits significant collective behavior. Plasma is a good conductor of electricity. By using a cleverly designed magnetic field, plasma can be captured, moved, and accelerated. The development of plasma physics provides new technologies and processes for the further development of sciences such as materials, energy, information, environmental space, space physics, and geophysics. Plasma is the fourth state of matter different from solids, liquids, and gases. Matter is composed of molecules, molecules are composed of atoms, and atoms are composed of a positively charged atomic nucleus and negatively charged electrons surrounding it. When heated to a sufficiently high temperature or due to other reasons, the outer electrons break free from the bondage of the atomic nucleus and become free electrons, just like students running to the playground to play freely after class. When electrons leave the atomic nucleus, this process is called "ionization". At this time, the matter becomes a uniform "paste" composed of positively charged atomic nuclei and negatively charged electrons. Therefore, people jokingly call it ionized plasma. The total amount of positive and negative charges in these ionized plasmas is equal, so it is approximately electrically neutral and is called plasma.

[0003] A plasma stove is a new type of cooking appliance that utilizes the characteristics of plasma, uses high-voltage electricity to break down air to form thermal plasma, converts electrical energy into heat energy, and finally obtains a thermal plasma beam with an ideal length and function, and generates a thermal plasma beam with flame-like characteristics to heat cookware for cooking.

[0004] At present, the plasma stoves on the market already have a preliminary heating function, but they have the following defects:

[0005] 1. Multiple discharge electrodes of the existing plasma stoves are uniformly powered by a single high-voltage power supply device. When adjusting the power, it is impossible to specifically control the on and off of a certain discharge electrode. Instead, multiple electrodes randomly discharge to generate plasma, which makes it impossible to accurately control which discharge electrode on the bottom of the pot generates an ion flame, and thus it is impossible to accurately control the heating position on the bottom of the cookware, affecting the cooking quality and effect.

[0006] 2. There is no reasonable structural design for the high-frequency high-voltage power generation circuit required for the discharge electrode to shield or suppress the electromagnetic radiation generated by it. Long-term use will cause harm to the health of users.

[0007] Therefore, the existing technology still needs to be improved. Summary of the Invention

[0008] In view of the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a plasma stove with controllable single electrodes, aiming to be able to individually control the switches of each discharge electrode, so as to accurately control the heating effect of the plasma stove, and at the same time effectively shield or suppress the electromagnetic radiation generated by the high-frequency high-voltage circuit in the plasma stove.

[0009] To achieve the above purpose, the present invention adopts the following technical solutions:

[0010] A plasma stove with controllable single electrodes includes a base, at least one burner head arranged on the base, and an electronic control unit arranged in the base. The burner head includes a cookware support exposed above the base and a plurality of discharge electrodes located inside the cookware support. The base and the cookware support are protected by grounding.

[0011] Among them, the burner head further includes a high-voltage package arranged in the base. The high-voltage package includes a shielding housing and a plurality of micro-transformers hermetically arranged in the shielding housing. The input end of each micro-transformer is electrically connected to the electronic control unit and is individually controlled by the electronic control unit. The output end of each micro-transformer is electrically connected to one of the discharge electrodes. Each micro-transformer converts the low-voltage electricity input by the electronic control unit into high-voltage electricity and discharges through the discharge electrode electrically connected thereto.

[0012] Among them, the high-voltage package further includes a first mounting circuit board and a second mounting circuit board in the shielding housing for fixing the upper and lower ends of each micro-transformer. The output ends of each micro-transformer are arranged in parallel on the first mounting circuit board, and the input ends of each micro-transformer are arranged in parallel on the second mounting circuit board.

[0013] Among them, each micro-transformer includes a first magnetic core and a second magnetic core arranged up and down and detachably connected, a primary coil and a secondary coil respectively sleeved on both sides of the first magnetic core and the second magnetic core, and a magnetic core fixing frame for locking the first magnetic core and the second magnetic core and fixing the upper and lower ends to the first mounting circuit board and the second mounting circuit board respectively.

[0014] Among them, the secondary coil is provided with a split groove structure for winding wires.

[0015] Among them, an insulating oil liquid for infiltrating the plurality of micro-transformers is poured into the shielding housing.

[0016] Among them, the burner head further includes a high-temperature resistant insulating board located above the shielding housing, and the high-temperature resistant insulating board mounts the plurality of discharge electrodes.

[0017] Wherein, a negative electrode for forming a discharge circuit with a plurality of discharge electrodes is further provided above the high-temperature resistant insulating plate, and the negative electrode is electrically connected to the power ground terminal of the electronic control unit.

[0018] Wherein, the shielding housing includes an upper cover and a bottom shell which is hermetically connected to the upper cover. The upper cover is fixedly connected to the bottom shell and supports the high-temperature resistant insulating plate and the cookware support. The bottom shell houses the plurality of micro transformers, and a temperature sensor is further provided on the bottom shell and is electrically connected to the electronic control unit.

[0019] Wherein, a wiring port and an oil filling port are hermetically connected to the side wall of the bottom shell;

[0020] A cooling fan is further provided on the base towards the side wall of the bottom shell of the high-voltage package, and an air inlet and an air outlet for the cooling fan to intake and exhaust air are provided.

[0021] Wherein, the burner further includes a liftable grounding device disposed above the high-voltage package. The liftable grounding device protrudes upwardly with an elastically liftable extending end for elastically contacting the bottom of the cookware, and the extending end is electrically grounded.

[0022] For the single-electrode controllable plasma cooker of the present invention, by arranging the high-voltage power supply part in the base as a high-voltage package, the high-voltage package is composed of a shielding housing hermetically provided with a plurality of micro transformers. The input end of each micro transformer is connected to the electronic control unit, and the output end is connected to a discharge electrode. Each micro transformer is individually controlled by the electronic control unit. In this way, the discharge of each discharge electrode can be individually controlled by its corresponding micro transformer in combination with the electronic control unit, so that it can accurately control which specific position on the bottom surface of the cookware generates the plasma beam, thereby precisely controlling the heating effect, improving the cooking quality, and at the same time, the shielding housing can effectively shield the electromagnetic radiation generated by the high-frequency and high-voltage electric field in the micro transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0024] Figure 1 It is a schematic structural diagram of the first embodiment of the single-electrode controllable plasma cooker of the present invention;

[0025] Figure 2 For Figure 1 Exploded schematic diagram of the structure;

[0026] Figure 3 For Figure 1Schematic cross-sectional view of the structure;

[0027] Figure 4 Schematic circuit principle diagram of the first embodiment of the plasma cooker with controllable single electrode of the present invention;

[0028] Figure 5 is Figure 1 Internal schematic diagram of the bottom surface of the structure;

[0029] Figure 6 Schematic structural diagram of the high-voltage package of the present invention;

[0030] Figure 7 is Figure 6 Exploded schematic diagram of the structure;

[0031] Figure 8 Schematic layout diagram of the micro-transformer in the high-voltage package of the present invention;

[0032] Figure 9 is Figure 8 Schematic diagram of another perspective of the structure;

[0033] Figure 10 Another schematic layout diagram of the micro-transformer in the high-voltage package of the present invention;

[0034] Figure 11 Schematic structural diagram of the micro-transformer of the present invention;

[0035] Figure 12 is Figure 11 Exploded schematic diagram of the structure;

[0036] Figure 13 Schematic cross-sectional view of the present invention provided with a liftable grounding device;

[0037] Figure 14 Schematic cross-sectional view of the contact state between the liftable grounding device and the bottom surface of the cookware.

[0038] Explanation of reference numerals:

[0039] 100 - Plasma stove, 1 - Base, 11 - Plug, 12 - Human - machine interaction panel, 13 - Switch button, 14 - Adjustment knob, 15 - Air inlet, 16 - Air outlet, 17 - Partition, 2 - Burner, 3 - Electric control unit, 31 - Main control circuit, 32 - Power supply circuit, 33 -, 4 - Cookware support, 5 - Discharge electrode, 6 - High - voltage pack, 61 - Shielding housing, 611 - Upper cover, 612 - Bottom shell, 6121 - Wiring port, 6122 - Oil filling port, 6123, 6124 - Ground wire terminal, 62 - Miniature transformer, 621 - First magnetic core, 622 - Second magnetic core, 623 - Primary coil, 624 - Secondary coil, 6241 - Split - slot structure, 625 - Magnetic core fixing bracket, 626, 627, 628, 629 - Terminal, 63 - First mounting circuit board, 64 - Second mounting circuit board, 65 - Temperature sensor, 7 - High - temperature insulating board, 8 - Negative electrode, 9 - Cooling fan, 10 - Lifting grounding device, 101 - Extended end, 200 - Cookware. Detailed implementation mode

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0041] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0042] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0043] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0044] Please refer to Figures 1 to 3 , the present invention provides a plasma cooker 100 with a controllable single electrode, which includes a base 1, at least one cooking burner 2 disposed on the base 1, and an electronic control unit 3 disposed in the base 1. The cooking burner 2 includes a cookware support 4 exposed above the base 1 and a plurality of discharge electrodes 5 located inside the cookware support 4. The base 1 and the cookware support 4 are grounded for protection. The cookware support 4 is used to support the cookware. During cooking, the cookware is placed on the cookware support 4 of the cooking burner 2, so that the cookware can also be effectively grounded to ensure the safety of use. The cookware can be made of materials such as metal cookware or ceramic cookware.

[0045] The cooking burner 2 of the embodiment of the present invention further includes a high-voltage package 6 disposed in the base 1. The high-voltage package 6 includes a shielding housing 61 and a plurality of micro transformers 62 hermetically disposed in the shielding housing 61. The input end of each micro transformer 62 is electrically connected to the electronic control unit 3 and is individually controlled by the electronic control unit 3. The output end of each micro transformer 62 is electrically connected to one of the discharge electrodes 5. Each micro transformer 62 converts the low-voltage power input by the electronic control unit 3 into high-voltage power and discharges through the discharge electrode 5 electrically connected thereto.

[0046] The electronic control unit 3 is used to generate the driving power required by the micro transformers 62, and control the on and off and output power of the micro transformers 62. The driving power generated by the electronic control unit 3 is a high-frequency low-voltage power supply after frequency conversion. The high-frequency power supply is suitable for using micro transformers. Otherwise, if a low-frequency power supply is used, a large-sized transformer is required. The micro transformers 62 convert the high-frequency low-voltage power input by the electronic control unit 3 into high-frequency high-voltage power and then output it to the discharge electrodes 5 for discharging. The arc generated by the discharge of the discharge electrodes 5 ionizes the air to generate high-temperature plasma to heat the bottom of the pot. In the embodiment of the present invention, the electronic control unit 3 and the high-voltage package 6 are isolatedly disposed in the base 1.

[0047] Since each discharge electrode 5 is individually connected to a micro transformer 62, the electronic control unit 3 individually controls each micro transformer 62 to achieve individual control of each discharge electrode 5, so that precise control can be performed on which specific position of the bottom of the pot generates a plasma beam for heating. For example, if the plurality of discharge electrodes 5 are arranged in multiple circles, when the heat is too high and the power needs to be reduced, several or all of the discharge electrodes 5 in the outer circle can be selectively turned off, so as to precisely control the heating of the bottom of the pot and improve the cooking quality. At the same time, since the shielding housing 61 seals the plurality of micro transformers 62 in a space, the electromagnetic radiation generated by the high-frequency high-voltage electric field in the high-voltage package 6 can be effectively shielded, thus ensuring the safety of the human body.

[0048] The discharge electrode 5 of the plasma stove 100 of the present invention is a positive electrode. When the cookware is a metal cookware, the metal cookware can be directly used as the negative electrode to form a discharge circuit; when the cookware is a ceramic cookware, a negative electrode needs to be separately provided in the stove head 2.

[0049] As Figure 4 shown, the electronic control unit 3 of the embodiment of the present invention includes a main control circuit 31, a power supply circuit 32 electrically connected to the main control circuit 31, and the output end of the power supply circuit 32 is electrically connected to the input ends of the plurality of micro transformers 62. The main control circuit 31 can be controlled by a single-chip microcomputer combined with a program. The main control circuit 31 individually controls the opening and closing of each micro transformer 62, and the power supply circuit 32 provides drive current for the plurality of micro transformers 62 in the high-voltage package 6. The power supply circuit 32 is connected to an external mains supply through a plug 11.

[0050] In the embodiment of the present invention, a human-machine interaction panel 12 is further provided on the base 1 for controlling the plasma stove 100. The human-machine interaction panel 12 can be set as a button or a touch screen. A switch button 13 and an adjustment knob 14 are also provided on the base 1 for turning on and off the plasma stove 100 and adjusting the output power. The output power adjustment can be controlled by the program built in the electronic control unit 3 to specifically control the on and off of a single discharge electrode 5. The human-machine interaction panel 12, the switch button 13 and the adjustment knob 14 are all electrically connected to the main control circuit 31. It can be understood that the electronic control unit 3 of the present invention can also be provided with a leakage detection circuit for detecting whether the plasma stove is leaking. The leakage detection circuit detects whether there is leakage in the base 1, the cookware support 4 of the stove head 2, the cookware, the high-voltage package 6, etc. Once leakage occurs, the main control circuit 31 controls to turn off the power supply of the plasma stove 100. Thus, the use safety is ensured.

[0051] Preferably, as Figure 5 shown, the electronic control unit 3 and the high-voltage package 6 of the present invention are isolated by a partition 17 provided on the base 1. To prevent the high-voltage package 6 from interfering with the electronic control unit 3 thermally and electrically and ensure the normal operation of the electronic control unit 3.

[0052] Specifically, as shown in FIGS. 6 to Figure 7As shown, the high-voltage package 6 of the embodiment of the present invention further includes a first mounting circuit board 63 and a second mounting circuit board 64 for fixing the upper and lower ends of each micro-transformer 62 within the shielding housing 61. The output terminals of each micro-transformer 62 are connected in parallel on the first mounting circuit board 63, and the input terminals of each micro-transformer 62 are connected in parallel on the second mounting circuit board 64. Both the first mounting circuit board 63 and the second mounting circuit board 64 are provided with mounting holes and printed circuits. In this way, both the first mounting circuit board 63 and the second mounting circuit board 64 can fix multiple micro-transformers 62 and also function as wire connections. The output terminal of the first mounting circuit board 63 is electrically connected to each discharge electrode 5, and the input terminal of the second mounting circuit board 64 is electrically connected to the electronic control unit 3. Since printed circuits are used instead of wires, no wires need to be arranged inside the high-voltage package 6, greatly saving space and facilitating installation at the same time.

[0053] Preferably, as Figure 8 and Figure 9 shown, multiple micro-transformers 62 of the embodiment of the present invention are arranged in an inner and outer layer circular arrangement. This is beneficial for layout and also for heat dissipation. It can be understood that the layout method of the multiple micro-transformers 62 arranged in an inner and outer layer circular arrangement in the embodiment of the present invention can also be the method shown in Figure 10 as well.

[0054] Preferably, the shielding housing 61 of the high-voltage package 6 in the embodiment of the present invention is filled with an insulating oil liquid that infiltrates the multiple micro-transformers 62. In this embodiment, the insulating oil liquid uses transformer oil. The transformer oil promptly conducts the heat generated by the micro-transformers 62 to the shielding housing 61 and then quickly dissipates it, further improving the heat dissipation effect of the high-voltage package 1. At the same time, the transformer oil has good insulating properties, ensuring the insulation performance between the micro-transformers 62 inside the high-voltage package 6 under high-frequency high-voltage electric fields.

[0055] The shielding housing 61 of the high-voltage package 6 in the embodiment of the present invention includes an upper cover 611 and a bottom shell 612 that is hermetically connected to the upper cover 611. The upper cover 611 and the bottom shell 612 are fixedly connected and support the cookware bracket 4. The bottom shell 612 houses the multiple micro-transformers 62, and a temperature sensor 65 is also provided on the bottom shell 612 and is electrically connected to the electronic control unit 3. The bottom shell 612 uses a metal housing to ensure the electromagnetic shielding effect, and the upper cover 611 can use a metal housing or a plastic housing. In order to have good insulation with the discharge electrode 5 thereon, the upper cover 611 of the present invention preferably uses a plastic housing.

[0056] The temperature sensor 65 can detect the temperature of the entire high-voltage package 6. During operation, when the actual temperature of the high-voltage package 6 exceeds the preset temperature, the power supply to the high-voltage package 6 will be cut off, causing the high-voltage package 6 to stop working to ensure safe use.

[0057] As Figure 6As shown, on the side wall of the bottom case 612 of the embodiment of the present invention, a wiring port 6121 and an oil injection port 6122 are hermetically connected; at the position of the oil injection port 6122, ground wire terminals 6123 and 6124 are also provided. The oil injection port 6122 is used for injecting and replacing transformer oil. The wiring port 6121 is used to connect the second mounting circuit board 64 and the electronic control unit 3 to supply power to and control each micro-transformer 62 in the high-voltage package 6. The ground wire terminals 6123 and 6124 are used for grounding the high-voltage package shielding case 61, the cookware support 4, etc.

[0058] Combined with Figure 2 and Figure 5 As shown, on the base 1 of the present invention, a cooling fan 9 facing the side wall of the bottom case 612 of the high-voltage package 6, and an air inlet 15 and an air outlet 16 for the cooling fan 9 to intake and exhaust air are further provided. This can quickly blow out the heat transferred from the shielding case 61 of the high-voltage package 6 from the base 1 to ensure the heat dissipation of the whole machine.

[0059] Furthermore, as Figures 11 to 12 shown, each micro-transformer 62 of the embodiment of the present invention includes a first magnetic core 621 and a second magnetic core 622 which are arranged up and down and are detachably connected, a primary coil 623 and a secondary coil 624 respectively sleeved on both sides of the first magnetic core 621 and the second magnetic core 622, and a magnetic core fixing frame 625 which locks the first magnetic core 621 and the second magnetic core 622 and fixes the upper and lower ends to the first mounting circuit board 63 and the second mounting circuit board 64 respectively. The first magnetic core 621 and the second magnetic core 622 adopt ferrite soft magnetic cores to ensure the excitation effect in the high-frequency circuit. And the first magnetic core 621 and the second magnetic core 622 are detachably connected, which is convenient for the installation of the primary coil 623 and the secondary coil 624. The magnetic core fixing frame 625 first locks the upper and lower ends of the first magnetic core 621 and the second magnetic core 622, and then fixes them to the first mounting circuit board 63 and the second mounting circuit board 64 respectively. Two wiring posts 626, 627 are provided at the bottom of the primary coil 623, which are respectively connected to the output ends from the electronic control unit 3 on the second mounting circuit board 64. A wiring post 628 is provided at the bottom of the secondary coil 624 for connecting to the electrical ground point on the second mounting circuit board 64, and a wiring post 629 is provided at the top of the secondary coil 624 for electrically connecting to the discharge electrode 5 through the circuit on the first mounting circuit board 63. Through the structural design of the transformer of the present invention, the transformer can be miniaturized and a transformer can be configured for each discharge electrode 5 for independent control.

[0060] Furthermore, the secondary coil 624 of this embodiment is provided with a split groove structure 6241 for winding wires. The split groove structure 6241 can enhance the insulation effect of the high-voltage output end.

[0061] Please continue to refer to Figure 2 and Figure 3, the burner 2 of the embodiment of the present invention further includes a high-temperature resistant insulating plate 7 located above the shielding housing 61, and the high-temperature resistant insulating plate 7 mounts the plurality of discharge electrodes 5. In the embodiment of the present invention, the upper cover 611 of the shielding housing 61 supports the high-temperature resistant insulating plate 7 and the cookware support 4. On the one hand, the high-temperature resistant insulating plate 7 can prevent the heat loss from the bottom of the cookware, and on the other hand, it can block the heat from flowing downward to the high-voltage package to prevent the temperature at the upper end of the high-voltage package 6 from being too high. At the same time, the high-temperature resistant insulating plate 7 is also used to mount and support the plurality of discharge electrodes 5.

[0062] Further, above the high-temperature resistant insulating plate 7 of the embodiment of the present invention, a negative electrode 8 for forming a discharge circuit with the plurality of discharge electrodes 5 is further provided, and the negative electrode 8 is electrically connected to the power ground terminal of the electronic control unit 3.

[0063] In the embodiment of the present invention, the negative electrode 8 is separately provided. In this way, during use, the cookware 200 is no longer part of the electrical circuit, changing the method of some existing plasma cookers 100 in which the plasma beam is generated between the "discharge electrode" and the "cookware", and allowing the plasma beam to be generated between the "discharge electrode" and the "negative electrode", so that both metal and non-metal cookware can be used on the plasma cooker 100 of the present invention. At the same time, it avoids the problem that when using the cookware as the negative electrode, the plasma directly hits the bottom of the cookware, causing the cookware to be punctured under long-term action and affecting the service life of the cookware.

[0064] Further, as Figure 13 and Figure 14 shown, the burner 2 further includes a liftable grounding device 10 provided above the high-voltage package 6. The liftable grounding device 10 protrudes upward with an elastically liftable protruding end 101 for elastically contacting the bottom of the cookware 200, and the protruding end 101 is electrically grounded. The protruding end 101 being electrically grounded causes the protruding end 101 to ultimately be connected to the ground and have a zero potential.

[0065] For safety requirements, in the prior art, when the cookware 200 is completely separated from the plasma cooker, the fire needs to be immediately turned off.

[0066] Because in the prior art, once the cookware 200 leaves the cookware support 4, the cookware 200 is no longer grounded. If the fire is not turned off, the discharge electrode may discharge towards the bottom of the cookware 200 that has left the cookware support 4, making the cookware 200 charged and prone to electric shock safety accidents. This makes it impossible for users to "flip the pan" (referring to the cooking action of lifting the cookware, leaving the cooking appliance, and repeatedly jolting to make the cooked food fully heated) during cooking in the prior art.

[0067] The liftable grounding device 10 provided in the present invention has a liftable extending end 101 that elastically contacts the bottom of the cookware 200. In this way, within the extending range of the extending end 101, even if the cookware 200 is lifted off the cookware support 4, since the bottom of the pot is still in contact with the extending end 101 and the extending end 101 is grounded, the cookware 200 remains grounded and there is no safety hazard. Again, even if the height at which the cookware 200 is lifted is higher than the maximum extending height of the extending end 101, at this time, since the bottom of the cookware 200 is far enough from the discharge electrode 5, the discharge electrode 5 will not discharge towards the bottom of the pot, and the cookware 200 at this time is also safe. In this way, the user can perform "wok tossing" during cooking without safety hazards. The maximum extending height of the extending end 101 can be designed through experiments. For example, the height of the maximum extending height of the extending end 101 from the plane of the discharge electrode 5 is greater than or equal to 50 mm.

[0068] At the same time, due to the safety function of the liftable grounding device 10, after the cookware 200 leaves the cookware support 4, the plasma cooker 100 of the present invention does not need to turn off the fire immediately, avoiding the defect in the prior art that if "wok tossing" is required, the cooker needs to turn off and turn on the fire repeatedly to ensure safety, resulting in discontinuous heat and affecting cooking.

[0069] The plasma cooker with a single electrode controllable proposed in the embodiment of the present invention sets the high-voltage power supply part in the base as a high-voltage package. The high-voltage package is composed of a plurality of micro transformers sealed by a shielding shell. The input end of each micro transformer is connected to the electronic control unit, and the output end is connected to a discharge electrode. Each micro transformer is individually controlled by the electronic control unit. In this way, the discharge of each discharge electrode can be individually controlled by its corresponding micro transformer in combination with the electronic control unit, so as to accurately control which specific position on the bottom of the pot generates the plasma beam, thereby precisely controlling the heating effect, improving the cooking quality. At the same time, the shielding shell can effectively shield the electromagnetic radiation generated by the high-frequency high-voltage electric field in the micro transformer, improving the safety of product use.

[0070] The above description is only an example clearly illustrating the present invention, and does not limit the patent scope of the present invention. It is impossible to list all implementation manners here. Any equivalent structural transformation made using the content of the technical solution of the present invention under the concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A single-electrode controllable plasma cooker comprising a base, at least one cooker head mounted on the base, and an electronic control unit disposed within the base, wherein the cooker head comprises a pot holder exposed above the base and a plurality of discharge electrodes located within the pot holder, and the base and pot holder are protectively grounded. It is characterized in that The stove head also includes a high-voltage transformer disposed in the base, the high-voltage transformer including a shielding shell, and a plurality of micro-transformers sealed in the shielding shell, the input end of each micro-transformer being electrically connected to the electronic control unit and independently controlled by the electronic control unit, the output end of each micro-transformer being electrically connected to one of the discharge electrodes, and each micro-transformer converting low-voltage electricity input from the electronic control unit into high-voltage electricity and discharging the electricity through the discharge electrode electrically connected thereto; The stove head further comprises a high temperature resistant insulating plate located above the shielding shell, and the high temperature resistant insulating plate is provided with the plurality of discharge electrodes; A negative electrode for forming a discharge loop with a plurality of discharge electrodes is further provided above the high temperature resistant insulation plate, and the negative electrode is electrically connected to the power ground terminal of the electronic control unit.

2. The single-electrode controllable plasma stove according to claim 1, characterized in that: The high-voltage transformer also includes a first mounting circuit board and a second mounting circuit board in the shielding shell for fixing the upper and lower ends of each micro-transformer. The first mounting circuit board is provided with the output end of each micro-transformer in parallel, and the second mounting circuit board is provided with the input end of each micro-transformer in parallel.

3. The single-electrode controllable plasma stove according to claim 2, characterized in that: Each micro-transformer includes a first magnetic core and a second magnetic core arranged upper and lower and detachably connected, a primary coil and a secondary coil respectively sleeved on both sides of the first magnetic core and the second magnetic core, and a magnetic core fixing frame that locks the first magnetic core and the second magnetic core and fixes the upper and lower ends to the first mounting circuit board and the second mounting circuit board respectively.

4. The single-electrode controllable plasma stove according to claim 3, characterized in that: The secondary coil is provided with a slot structure for winding a wire.

5. The single-electrode controllable plasma cooker according to claim 1, characterized in that: The shielding shell is filled with insulating oil that soaks the multiple micro-transformers.

6. The single-electrode controllable plasma stove according to claim 1, characterized in that: The shielding shell includes an upper cover and a bottom shell sealed to the upper cover. The upper cover is fixedly connected to the bottom shell and supports the high-temperature resistant insulation board and the pot holder. The bottom shell accommodates the multiple micro-transformers. A temperature sensor is also provided on the bottom shell and is electrically connected to the electronic control unit.

7. The single-electrode controllable plasma cooker according to claim 6, characterized in that: The side wall of the bottom shell is sealed with a wiring port and an oil filling port; The base is also provided with a cooling fan facing the side wall of the bottom shell of the high-voltage package, and an air inlet and an air outlet for the cooling fan to take in and out air.

8. The single-electrode controllable plasma cooker according to claim 1, characterized in that: The stove head also includes a liftable grounding device arranged above the high-voltage package. The liftable grounding device protrudes upward and is provided with an elastically liftable protruding end for elastically contacting the bottom of the pot. The protruding end is electrically grounded.

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