CN202385322U

CN202385322U - Microwave oven

Info

Publication number: CN202385322U
Application number: CN2011205277084U
Authority: CN
Inventors: 梁伟国
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-06-18
Filing date: 2011-12-16
Publication date: 2012-08-15
Anticipated expiration: 2021-12-16
Also published as: CN202328414U; CN202334974U; CN202385323U; CN202455577U; CN202385321U; CN202455576U

Abstract

The utility model relates to a microwave oven which comprises a high-voltage transformer, a magnetron, a high-voltage capacitor and a recoverable over-voltage protection device; and the cathode of the magnetron is connected with a filament winding to form a heating loop. A secondary winding, the high-voltage capacitor and the recoverable over-voltage protection device form a half-wave voltage doubling circuit; and the input end of the recoverable over-voltage protection device is connected with the heating loop, and the output end of the recoverable over-voltage protection device is connected with the anode of the magnetron. According to the microwave oven, the design is reasonable, the recoverable over-voltage protection device replaces an original high-voltage diode; when the surge of the magnetron makes the voltage between the cathode and the anode exceed a certain value, the recoverable over-voltage protection device is started; the microwave stove can return to normal through the filter surge of a circuit in which the recoverable over-voltage protection device is arranged after the voltage is reduced or the microwave stove is powered off and restarted, so that a high-voltage transformer, a high-voltage capacitor and other elements are not affected by the surge and the voltage resistant requirement of the high-voltage capacitor is reduced on the one hand, and the repair times of the microwave stove can be reduced on the other hand.

Description

Microwave oven

Technical field

The utility model relates to a kind of microwave oven.

Background technology

About secondary general the output 2000VAC of existing a kind of high voltage transformer of microwave oven; And secondary winding one end is through contacting ground connection with transformer framework; Therefore have a half-wave voltage-multiplying circuit in the secondary back of microwave oven; Earlier to the charging of the electric capacity in the half-wave voltage-multiplying circuit, the output when utilizing other half reversal periods of high-tension transformer then, stack had originally charged the voltage that the electric capacity of electricity forms about a 4000VAC and had made its work to magnetron high-tension transformer in the half period of a sine wave; For the high temperature that prevents high-tension transformer causes security incidents such as winding is on fire; General high-voltage fuse component of series connection between high-tension transformer secondary winding and high-voltage capacitance, when image height taking place press diode breakdown etc. unusual, the electric current of secondary winding surpasses the current limit of high-voltage fuse; Fuse will burn to play a protective role; Since magnetron the moment that starts high energy produce one 2～30,000 volts reverse impulse, pass through the negative electrode that high-voltage capacitance, secondary winding are got back to magnetron from the anode of magnetron, in order to deal with the reverse impulse of magnetron; High-tension transformer and high-voltage capacitance all have special requirement of withstand voltage, and this has just increased the cost of microwave oven.

Summary of the invention

Therefore, first purpose of the utility model is to provide a kind of and can handles the reverse impulse of magnetron and the microwave oven that can reduce cost.

Above-mentioned purpose adopts following technical proposals to realize.

A kind of microwave oven comprises high-tension transformer, magnetron, high-voltage capacitance and recoverable over-pressure safety device, and high-tension transformer comprises skeleton, elementary winding, secondary winding and Filament Winding again, and the negative electrode and the Filament Winding of magnetron connect to form heating circuit.Secondary winding, high-voltage capacitance and recoverable over-pressure safety device are formed the half-wave voltage-multiplying circuit, and the input of recoverable over-pressure safety device is connected with heating circuit, and the output of recoverable over-pressure safety device is connected with anode of magnetron.

Technique scheme also can be done following further perfect.

Said recoverable over-pressure safety device is recoverable diode.

Said recoverable over-pressure safety device is recoverable Transient Voltage Suppressor.

Said recoverable over-pressure safety device is made up of diode and controllable diode reverse parallel connection, and the input of diode is connected with heating circuit.

Be provided with load in the said half-wave voltage-multiplying circuit.

Be parallel with high-voltage diode between the input of said recoverable over-pressure safety device and the output, the polarity of high-voltage diode is identical with the polarity of recoverable over-pressure safety device.

Second purpose of the utility model is to provide a kind of microwave oven that can handle the reverse impulse of magnetron and further improve the magnetron power output.

Above-mentioned purpose adopts following technical proposals to realize.

A kind of microwave oven; Comprise high-tension transformer, magnetron, high-voltage capacitance, recoverable over-pressure safety device and transformer; High-tension transformer comprises skeleton, elementary winding and secondary winding again; Secondary winding, high-voltage capacitance and recoverable over-pressure safety device are formed the half-wave voltage-multiplying circuit, and the output of recoverable over-pressure safety device is connected with anode of magnetron, and transformer comprises input winding and output winding; Output winding and magnetron cathode connect to form heating circuit, and the input of recoverable over-pressure safety device is connected with heating circuit.

The utility model is reasonable in design; Use recoverable over-pressure safety device to replace original high-voltage diode; When the surge of magnetron makes the voltage between the anode and cathode surpass one regularly, recoverable over-pressure safety device starts, and the circuit through recoverable over-pressure safety device place filters surge; After voltage reduces or after the microwave oven outage reopening, can make microwave oven recover normal; Guarantee that devices such as high-tension transformer and high-voltage capacitance are not influenced by surge on the one hand, reduce the requirement of withstand voltage of high-voltage capacitance, can reduce the number of times of microwave oven maintenance again.

Description of drawings

Fig. 1 is the high-pressure section electric diagram of embodiment 1.

Fig. 2 is the high-pressure section electric diagram of embodiment 2.

Fig. 3 is the high-pressure section electric diagram of embodiment 3.

Fig. 4 is the high-pressure section electric diagram of embodiment 4.

Fig. 5 is the high-pressure section electric diagram of embodiment 5.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is done further to detail.

Embodiment 1; In conjunction with Fig. 1, a kind of microwave oven comprises high-tension transformer 1, high-voltage fuse 8, high-voltage capacitance 9, magnetron 11, recoverable over-pressure safety device 12; High-tension transformer 1 comprises that again elementary winding 2, secondary winding 3 and Filament Winding 4, elementary winding have input 5,6,7; Secondary winding 3, high-voltage fuse 8, recoverable over-pressure safety device 12 and high-voltage capacitance 9 constitute the half-wave voltage-multiplying circuit, and the negative electrode of magnetron 11 and Filament Winding 4 connect to form heating circuit, and heating circuit is connected with the input of recoverable over-pressure safety device 12; One end ground connection of the output of recoverable over-pressure safety device 12 and secondary winding 3; The anode of magnetron 11 is connected with ground, and recoverable over-pressure safety device 12 is a recoverable Transient Voltage Suppressor (TVS), because the surge between the anode and cathode of magnetron makes voltage surpass a timing (as 10000 volts); The characteristic equivalence of TVS is the device of a low resistance; Surge directly discharges from the anode of magnetron to the negative electrode and through heating circuit, can other devices of micro-wave oven high-voltage part not impacted, when surge later or the microwave oven outage reopen after TVS recovery diode characteristic.

Embodiment 2, and in conjunction with Fig. 2, embodiment 2 is in the half-wave voltage-multiplying circuit, to increase a high-voltage diode 10 with the difference of embodiment 1, and the input of high-voltage diode 10 is connected the output head grounding of high-voltage diode 10 with magnetron 11 negative electrodes.

Embodiment 3, and in conjunction with Fig. 3, embodiment 3 is that with the difference of embodiment 2 output of recoverable over-pressure safety device 12 is connected a load 13 ground connection again, and cancels the input 6 of elementary winding 3.

Embodiment 4; In conjunction with Fig. 4, embodiment 4 is that with the difference of embodiment 1 recoverable over-pressure safety device 12 is composed in parallel by high-voltage diode 10 and controllable silicon 21, and high-voltage diode 10 is opposite with controllable silicon 21 polarity; The input of high-voltage diode 10 is connected with heating circuit; High-voltage diode 10 output head groundings, when detecting overtension, 21 conductings of control controllable silicon discharge surge.

Embodiment 5, in conjunction with Fig. 5, and a kind of microwave oven; Comprise high-tension transformer 1, high-voltage fuse 8, high-voltage capacitance 9, high-voltage diode 10, magnetron 11, recoverable over-pressure safety device 12; High-tension transformer 1 comprises that again elementary winding 2, secondary winding 3, elementary winding have input 5 and 7, also has a transformer 16, and transformer 16 comprises input winding 17 and output winding 18 again; The input winding has

input

19,20; Secondary winding 3, high-voltage fuse 8, high-voltage diode 10 and high-voltage capacitance 9 constitute the half-wave voltage-multiplying circuit, and the negative electrode of magnetron 11 connects to form heating circuit with output winding 18, and heating circuit is connected with the input of high-voltage diode 10; One end ground connection of the output of high-voltage diode 10 and secondary winding 3; The anode of magnetron 11 is connected with ground, between the magnetron anode and cathode, is connected with recoverable over-pressure safety device 12, and recoverable over-pressure safety device 12 is Transient Voltage Suppressor (TVS); The input of recoverable over-pressure safety device 12 is connected with magnetron cathode, and the output of recoverable over-pressure safety device 12 is connected with anode of magnetron.

The purpose of this patent is between anode and cathode, to be provided with recoverable over-pressure safety device and discharges surge; Avoid surge that high-voltage capacitance in the high-tension circuit etc. is impacted; Recoverable over-pressure safety device can not have influence on the operate as normal of magnetron; Recoverable diode or Transient Voltage Suppressor (TVS) are best choice, and other functionally similar devices or combination of devices are also in the protection range of this patent.

Claims

1. microwave oven; Comprise high-tension transformer, magnetron and high-voltage capacitance; High-tension transformer comprises skeleton, elementary winding, secondary winding and Filament Winding again, and the negative electrode and the Filament Winding of magnetron connect to form heating circuit, it is characterized in that: also comprise recoverable over-pressure safety device;

Secondary winding, high-voltage capacitance and recoverable over-pressure safety device are formed the half-wave voltage-multiplying circuit, and the input of recoverable over-pressure safety device is connected with heating circuit, and the output of recoverable over-pressure safety device is connected with anode of magnetron.

2. according to the said microwave oven of claim 1, it is characterized in that: said recoverable over-pressure safety device is recoverable diode.

3. according to the said microwave oven of claim 1, it is characterized in that: said recoverable over-pressure safety device is recoverable Transient Voltage Suppressor.

4. according to the said microwave oven of claim 1, it is characterized in that: said recoverable over-pressure safety device is made up of diode and controllable diode reverse parallel connection, and the input of diode is connected with heating circuit.

5. according to the said microwave oven of claim 1, it is characterized in that: be provided with load in the said half-wave voltage-multiplying circuit.

6. according to the said microwave oven of claim 1, it is characterized in that: be parallel with high-voltage diode between the input of said recoverable over-pressure safety device and the output, the polarity of high-voltage diode is identical with the polarity of recoverable over-pressure safety device.

7. a microwave oven comprises high-tension transformer, magnetron and high-voltage capacitance, and high-tension transformer comprises skeleton, elementary winding and secondary winding again, it is characterized in that: also comprise recoverable over-pressure safety device;

Secondary winding, high-voltage capacitance and recoverable over-pressure safety device are formed the half-wave voltage-multiplying circuit, and the output of recoverable over-pressure safety device is connected with anode of magnetron;

Also comprise a transformer, transformer comprises input winding and output winding, and output winding and magnetron cathode connect to form heating circuit, and the input of recoverable over-pressure safety device is connected with heating circuit.