CN201765916U

CN201765916U - Microwave oven high voltage transformer and microwave oven comprising the same

Info

Publication number: CN201765916U
Application number: CN2010201526670U
Authority: CN
Inventors: 梁伟国
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-03-31
Filing date: 2010-03-31
Publication date: 2011-03-16
Anticipated expiration: 2020-03-31

Abstract

The utility model relates to a microwave oven high voltage transformer and a microwave oven comprising the same. The microwave oven high voltage transformer comprises a transformer framework, a secondary winding and a primary winding. The utility model is characterized in that the primary winding is provided with at least four power input ends, and one output end of the secondary winding is electrically connected with the transformer framework. The utility model has reasonable design, can make the overall efficiency of the microwave oven improved, can reduce the temperature rise and the noise of the complete machine and make the microwave oven have the advantages of high efficiency, low loss and low temperature rise.

Description

A kind of high voltage transformer of microwave oven and contain the microwave oven of this high-tension transformer

Technical field

The utility model relates to a kind of high voltage transformer of microwave oven and contains the microwave oven of this high-tension transformer.

Background technology

The high-tension transformer of existing microwave oven generally adopts magnetic-leakage type EI sheet metal skeleton and copper cash or aluminum steel to form as winding, about secondary general output 2000VAC of high voltage transformer of microwave oven, and secondary winding one end contacts ground connection with transformer framework, therefore have a half-wave voltage-multiplying circuit in the secondary back of microwave oven, high voltage transformer of microwave oven charges to the electric capacity in the half-wave voltage-multiplying circuit earlier in the half period of a sine wave, output when utilizing other half reversal periods of high-tension transformer then, the voltage that stack had originally charged about electric 4000VAC of electric capacity composition makes its work to magnetron, because the input voltage of microwave oven might fluctuate up and down in the daily use, when voltage descends, the power of microwave oven will obviously reduce, when voltage rises, the power of microwave oven obviously increases, and makes microwave oven on the low side higher with temperature rise aspect Energy Efficiency Ratio.When employing contains the high-tension transformer of this structure, equally also easily cause microwave oven to decrease ring.

Summary of the invention

First purpose of the present utility model is to provide a kind of high voltage transformer of microwave oven that stable power output can both be arranged when input voltage changes greatly.

Above-mentioned purpose adopts following technical proposals to realize:

A kind of high voltage transformer of microwave oven comprises transformer framework, Filament Winding, secondary winding and elementary winding, and described elementary winding is provided with four power inputs at least, and an output of secondary winding and transformer framework are electrically connected.

Can do following simplification in order to make transformer efficiency more stablize first technical scheme:

Described elementary winding is wrapped on the skeleton by thin film conductor and forms, or adopts wire rods such as copper cash, aluminum steel to be wrapped on the skeleton to form.Described transformer framework be shaped as " EI " or " I " shape.By selecting the defeated turn ratio of regulating elementary winding of bringing in of closed different electrical power.Above-mentioned transformer production is fairly simple, can also can be merged into a winding to several windings according to the tap in winding process of existing winding, and the merging tie point is a power input.

Second purpose of the present utility model is to provide a kind of microwave oven that stable power output can both be arranged when input voltage changes greatly.

Above-mentioned purpose adopts following technical proposals to realize:

A kind of microwave oven, comprise circuit control device, transformer framework, Filament Winding, secondary winding and, elementary winding, by-pass cock, by-pass cock is electrically connected with circuit control device, by-pass cock is closed and disconnection by circuit control device control, described elementary winding is provided with four power inputs at least, power input is all or part of to be connected with by-pass cock, according to input power source voltage size, control corresponding power input and the input power turn-on that is complementary by by-pass cock, an output of secondary winding and transformer framework are electrically connected.

On two power input bases of former elementary winding, increase by two or two above power inputs, these power inputs are independent to each other, recently reach different output voltage with stability microwave stove power by connecting the number of turn that different power inputs changes elementary winding.

Technique scheme can be done following further perfect:

Described elementary winding is wrapped on the skeleton by thin film conductor and forms, or adopts wire rods such as copper cash, aluminum steel to be wrapped on the skeleton to form.Described transformer framework be shaped as " EI " or " I " shape.Regulate the turn ratio of elementary winding by selecting closed different electrical power input terminal.Above-mentioned transformer production is fairly simple, can also can be merged into a winding to several windings according to the tap in winding process of existing winding, and the merging tie point is a power input.

The utility model is reasonable in design, can make the microwave oven overall efficiency improve, reduce complete machine temperature rise and noise.The applicant improves high voltage transformer of microwave oven, what the power input at the elementary winding two ends of transformer increased by two elementary windings outward at least takes out the end of a thread as power input, these power inputs are independent to each other, resistance between any power input and other any power inputs is all inequality, by connecting the number of turn that different power inputs changes transformer stability microwave stove power recently, the secondary of transformer has output to be connected with transformer framework, uses the microwave oven of such high-tension transformer can reach high efficiency, low-loss, the advantage of low temperature rise.

Description of drawings

Fig. 1 is the structural representation of embodiment 1;

Fig. 2 is the microwave oven partial electrical principle schematic of embodiment 1;

Fig. 3 is the structural representation of embodiment 2;

Fig. 4 is the structural representation of embodiment 3.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples.

Embodiment 1, in conjunction with Fig. 1, a kind of high voltage transformer of microwave oven, comprise high-tension transformer skeleton 1, elementary winding 2, secondary winding 3 and Filament Winding 4, elementary winding 2 comprises power input 5 again, power input 6, power input 7 and power input 8, one output 9 ' and the transformer framework 1 of secondary winding 3 are electrically connected, the other end is an output 9, Filament Winding 4 comprises output 10 and output 11 again, when the operating voltage of microwave oven is near rated voltage, carry out power supply by power input 5 with power input 7 and be connected the microwave oven work that makes elementary winding 2, when operating voltage than rated voltage after a little while, carry out power supply by power input 5 with power input 6 and be connected the microwave oven work that makes elementary winding 2, because power input 5, between 6 than power input 5, umber of turn is few between 7, therefore secondary energy produces higher voltage, so the decline of power supply can not influence microwave power big variation is not arranged, equally, when operating voltage is higher than rated voltage, carries out power supply by power input 5 with power input 8 and be connected the microwave oven work that makes elementary winding 2.

In conjunction with Fig. 2, elementary winding 2 power inputs 5 are connected with by-pass cock 20, and

other power input

6,7,8 is connected with by-

pass cock

21,22,23 respectively, and the circuit control device present embodiment does not illustrate, and realize with existing circuit board commonly used.Elementary winding is selected different umber of turns by the closure of different adjustment switch.The output 9 of secondary winding 3 is connected with the input of protective tube assembly 24, the output of protective tube assembly 24 respectively with magnetron 25, and by high-voltage diode ground connection.

Embodiment 2, and in conjunction with Fig. 3, the difference of embodiment 2 and embodiment 1 is: elementary winding 2 has increased power input 12.

Embodiment 3, and in conjunction with Fig. 4, the difference of embodiment 3 and embodiment 1 is: power input terminal 5 is extremely normally closed with input power supply one.

The microwave oven that contains the foregoing description structure be not described further herein, because except said structure is improvements of the present utility model, other structure is consistent with existing microwave oven basically, by disclosing of the foregoing description, those of ordinary skills can produce the microwave oven that contains said structure.

Claims

1. a high voltage transformer of microwave oven comprises transformer framework, Filament Winding, secondary winding and elementary winding, it is characterized in that: described elementary winding is provided with four power inputs at least, and an output of secondary winding and transformer framework are electrically connected.

2. high voltage transformer of microwave oven according to claim 1 is characterized in that: elementary winding is for being the film-type winding.

3. high voltage transformer of microwave oven according to claim 1 is characterized in that: elementary winding is a wire rod type winding.

4. according to claim 1 or 2 or 3 described high voltage transformer of microwave oven, it is characterized in that: described transformer framework be shaped as " EI " shape.

5. according to claim 1 or 2 or 3 described high voltage transformer of microwave oven, it is characterized in that: described transformer framework be shaped as " I " shape.

6. microwave oven, comprise circuit control device, transformer framework, Filament Winding, secondary winding and elementary winding, it is characterized in that: also comprise by-pass cock, by-pass cock is electrically connected with circuit control device, by-pass cock is closed and disconnection by circuit control device control, described elementary winding is provided with four power inputs at least, power input is all or part of to be connected with by-pass cock, according to input power source voltage size, control corresponding power input and the input power turn-on that is complementary by by-pass cock, an output of secondary winding and transformer framework are electrically connected.

7. microwave oven according to claim 6 is characterized in that: elementary winding is for being the film-type winding.

8. microwave oven according to claim 6 is characterized in that: elementary winding is a wire rod type winding.

9. according to claim 6 or 7 or 8 described microwave ovens, it is characterized in that: described transformer framework be shaped as " EI " shape.

10. according to claim 6 or 7 or 8 described microwave ovens, it is characterized in that: described transformer framework be shaped as " I " shape.