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CN-122015139-A - EMC optimized electric flame stove

CN122015139ACN 122015139 ACN122015139 ACN 122015139ACN-122015139-A

Abstract

The invention discloses an EMC optimized electric flame stove which comprises a case, an EMI filtering component, a power supply board, a shielding cover, a transformer, a resonant inductor, a voltage doubling rectifying board and a stove head component, wherein the EMI filtering component, the power supply board, the shielding cover, the transformer, the resonant inductor and the voltage doubling rectifying board are arranged in the case, and the stove head component is arranged on the case. The transformer and the resonant inductor are jointly arranged in the same shielding case, the magnetic field excitation directions of the transformer and the resonant inductor are in reverse arrangement, so that mutual cancellation of magnetic fields and mutual suppression of resonant interference are realized, meanwhile, interference energy forms a closed circulation in the shielding case, is absorbed by eddy current loss of a metal body of the shielding case and converted into heat energy to be dissipated, and avoids outward radiation in an electromagnetic wave form.

Inventors

  • Request for anonymity

Assignees

  • 益能电焰科技(深圳)有限公司

Dates

Publication Date
20260512
Application Date
20260413

Claims (8)

  1. 1. The utility model provides an EMC optimization type electric flame kitchen, includes the quick-witted case, installs in quick-witted incasement EMI filter module, power strip, shield cover, transformer, resonant inductance, doubly presses the rectification board to and install the furnace end subassembly on the quick-witted case, its characterized in that: The machine case comprises a shielding bottom shell and a shielding surface shell, wherein the shielding surface shell is detachably arranged on the top of the shielding bottom shell; The transformer and the resonant inductor are arranged in the shielding case together, and ventilation openings for opposite flows are formed in two opposite sides of the shielding case.
  2. 2. The EMC optimized electric flame cooker of claim 1, wherein the EMI filter assembly is composed of a shielding case and an EMI filter board disposed in the shielding case, the EMI filter board having two input wires of different polarities, and a section of the input wires located inside the case being wrapped with a shielding case.
  3. 3. The EMC optimized electric flame range of claim 1, wherein the transformer and the resonant inductor are commonly mounted on the same printed circuit board, and the magnetic field excitation directions of the two are arranged in opposite directions.
  4. 4. The EMC optimized electric flame cooker of claim 3, wherein the shield is single point grounded.
  5. 5. The EMC optimized type electric flame stove according to claim 1, wherein an air intake grill is opened at a side wall of the shielding bottom case, and a plurality of heat radiation fans are installed at an inner side of the air intake grill.
  6. 6. The EMC optimized electric flame stove according to claim 1, wherein the burner assembly comprises a burner shielding shell and a plurality of electrode pins arranged in the burner shielding shell, and a plurality of negative electrode pipes corresponding to the electrode pins are further arranged on the top surface of the burner shielding shell.
  7. 7. The EMC optimized electric flame range of claim 6, wherein the voltage doubler rectifying plate is provided with a plurality of voltage doubler rectifying units corresponding to the electrode pins, and a resonance capacitor and a resonance resistor.
  8. 8. The EMC optimized electric flame range of claim 3, wherein the assembly process of the transformer and the resonant inductor together mounted on the same printed circuit board is: s1, a high-voltage insulating printed circuit board is selected, special bonding pads of a transformer and a resonant inductor are etched in advance on the board, copper foil wiring is paved at the same time, and one copper foil wiring directly connects a bonding pad at a first end of a secondary winding of the transformer with a bonding pad of a similar resonant inductor; S2, customizing and processing a main winding coil of the transformer and a coil of the resonant inductor in opposite winding directions, and locking the reverse characteristic of a magnetic field; and S3, accurately aligning and mounting the transformer and the resonant inductor respectively corresponding to the bonding pads.

Description

EMC optimized electric flame stove Technical Field The invention relates to an electric flame stove. Background The existing electric flame stove generally only focuses on the design of high-voltage electric safety and structural insulation, and has obvious defects in electromagnetic compatibility. The alternating current modules such as the EMI filter circuit, the high-voltage transformer, the resonant inductor and the like are high-frequency high-voltage interference sources, strong electromagnetic radiation and conduction interference can be generated during working, and resonant waveform distortion and interference energy superposition are easy to generate among the modules, so that interference is caused to the main control circuit, the PFC conversion power supply circuit and the outside. The invention patent with the application number 2019106831779 discloses an electric flame stove, wherein a main control circuit board assembly comprises a metal shielding cover and a printed circuit board arranged in the metal shielding cover, and electromagnetic waves generated by a reflecting transformer are reflected by the metal shielding cover, so that the influence of electromagnetic radiation on circuits and components on the printed circuit board is avoided. However, the technical solution of the above patent of the invention cannot truly solve the technical problem of electromagnetic compatibility, and electromagnetic waves generated by high-frequency alternating current of the transformer still radiate to the outside, affect other components and external components or human bodies in the chassis, and cannot achieve the effect of electromagnetic compatibility. On the basis of the technical scheme, an independent shielding box is added to the transformer, electromagnetic waves radiated outwards during working of the transformer are continuously reflected inside the shielding box and cannot be effectively dissipated, so that the field intensity inside the shielding box is obviously increased, energy is accumulated, air inside the shielding box is easy to break down, meanwhile, reflected high-frequency interference can be reversely coupled back to a transformer winding, working waveform distortion, resonance point offset and output high voltage instability are caused, the stability of an electric flame stove is affected, in addition, if the shielding box is grounded, a strong electric field generated inside the shielding box is conducted to a main control board and a power line through a ground wire, large-area conduction interference and secondary electromagnetic radiation are formed, a power grid is polluted, and the electric flame stove cannot pass EMC authentication. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a technical scheme capable of solving the problems. An EMC optimized electric flame stove comprises a case, an EMI filtering component, a power panel, a shielding cover, a transformer, a resonant inductor, a voltage doubling rectifying plate and a stove head component, wherein the EMI filtering component, the power panel, the shielding cover, the transformer, the resonant inductor and the voltage doubling rectifying plate are arranged in the case; The machine case comprises a shielding bottom shell and a shielding surface shell, wherein the shielding surface shell is detachably arranged on the top of the shielding bottom shell; the transformer and the resonant inductor are arranged in a shielding case together, and ventilation openings for opposite flows are formed in two opposite sides of the shielding case; Preferably, the EMI filter assembly consists of a shielding box and an EMI filter board arranged in the shielding box, wherein the EMI filter board is provided with two input wires with different polarities, and a shielding sleeve is wrapped on the section of the input wires positioned in the chassis; preferably, the transformer and the resonant inductor are mounted on the same printed circuit board together, and the magnetic field excitation directions of the transformer and the resonant inductor are arranged reversely; Preferably, the shielding cover is grounded in a single point; Preferably, an air inlet grille is arranged on one side wall of the shielding bottom shell, and a plurality of cooling fans are arranged on the inner side of the air inlet grille; preferably, the furnace end assembly comprises a furnace end shielding shell and a plurality of electrode pins arranged in the furnace end shielding shell, and a plurality of negative electrode tubes corresponding to the electrode pins are further arranged on the top surface of the furnace end shielding shell; Preferably, the voltage doubling rectifying plate is provided with a plurality of voltage doubling rectifying units corresponding to the electrode pins, and a resonant capacitor and a resonant resistor; Preferably, the assembly process of the transformer and the resonant inductor mou