CN102638914A

CN102638914A - Microwave oven

Info

Publication number: CN102638914A
Application number: CN2012101210046A
Authority: CN
Inventors: 梁伟国
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-04-24
Filing date: 2012-04-24
Publication date: 2012-08-15

Abstract

The invention relates to a microwave oven. The microwave oven comprises a magnetron and a high-voltage transformer, wherein the high-voltage transformer comprises a framework, a filament winding, a secondary winding and a primary winding; the filament winding is connected with the cathode of the magnetron to form a heating loop; the anode of the magnetron is earthed; the secondary winding is provided with a normal phase output port, an inverted output port and a common port; the normal phase output port is connected with a first high-voltage capacitor and a first high-voltage diode in series to form a first half-wave voltage doubling circuit; and the inverted output port is connected with a second high-voltage capacitor and a second high-voltage diode in series to form a second half-wave voltage doubling circuit; and the common port is earthed. The microwave oven is reasonable in design and can make the most of the three output ports of the secondary winding of the high-voltage transformer to form two heterogeneous half-wave voltage doubling circuits, so that the positive and negative half-wave output powers of the high-voltage transformer are roughly equal, thus reducing the temperature rise of the high-voltage transformer and improving the efficiency.

Description

Microwave oven

Technical field

The present invention relates to a kind of microwave oven.

Background technology

Existing microwave oven generally comprises high-tension transformer, high-voltage capacitance, high-voltage diode and magnetron; High-tension transformer comprises elementary winding, secondary winding, Filament Winding and transformer framework four parts again; Voltage about the secondary output 2000VAC of high-tension transformer; Secondary winding, high-voltage capacitance and high-voltage diode are formed the half-wave voltage-multiplying circuit and are come the work of driven magnetic keyholed back plate, because high-tension transformer has half-wave to charge to electric capacity in the course of the work, have half-wave to carry out voltage and superpose the driven magnetic keyholed back plate; Therefore the power of high-tension transformer is unequal in one-period, causes the high-tension transformer serious inefficiency of generating heat.

Summary of the invention

The object of the present invention is to provide a kind of realization power output microwave oven efficiently.

Above-mentioned purpose adopts following technical proposals to realize.

A kind of microwave oven comprises magnetron and high-tension transformer, and high-tension transformer comprises skeleton, Filament Winding, secondary winding and elementary winding again, and Filament Winding and magnetron cathode connect to form heating circuit, anode of magnetron ground connection.

Said secondary winding has positive output end, reversed-phase output and three ports of common port;

The forward output is connected with first high-voltage capacitance, first high-voltage diode and is constituted the first half-wave voltage-multiplying circuit; The output head grounding of first high-voltage diode; The first half-wave voltage-multiplying circuit is connected with heating circuit through the 3rd high-voltage diode, and the output of the 3rd high-voltage diode is connected with the input of first high-voltage diode;

Reversed-phase output is connected with second high-voltage capacitance, second high-voltage diode and is constituted the second half-wave voltage-multiplying circuit; The output head grounding of second high-voltage diode; The second half-wave voltage-multiplying circuit is connected with heating circuit through the 4th high-voltage diode, and the output of the 4th high-voltage diode is connected with the input of second high-voltage diode;

Said common end grounding.

Technique scheme can be done further perfect as follows.

Said common port is connected with skeleton, skeleton ground connection.

Said common end grounding, common port and skeleton open circuit.

Said common port is connected with the 5th high-voltage diode input, the 5th high-voltage diode output head grounding.The said second high-voltage diode output, the 4th high-voltage diode output are connected with the input of the 5th high-voltage diode,

Have at least a winding to connect in said Filament Winding, secondary winding and the elementary winding with the Temperature protection device.

The present invention is reasonable in design; Can utilize the half-wave voltage-multiplying circuit of two out-phase of three outputs compositions of high-tension transformer secondary winding as far as possible; Make high-tension transformer positive and negative half-wave power output about equally, thereby reduce the temperature rise of high-tension transformer, raise the efficiency.

Description of drawings

Fig. 1 is the micro-wave oven high-voltage part schematic diagram of embodiment 1.

Fig. 2 is the micro-wave oven high-voltage part schematic diagram of embodiment 2.

Fig. 3 is the micro-wave oven high-voltage part schematic diagram of embodiment 3.

Fig. 4 is the micro-wave oven high-voltage part schematic diagram of embodiment 4.

Fig. 5 is the micro-wave oven high-voltage part schematic diagram of embodiment 5.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is made further detailed description.

Embodiment 1, in conjunction with Fig. 1, and a kind of microwave oven; Comprise high-tension transformer 1 and magnetron 30, high-tension transformer 1 comprises skeleton 2, elementary winding 3, secondary winding 4 and Filament Winding 5 again, and Filament Winding 5 is formed heating circuit with the negative electrode of magnetron 30; Secondary winding 4 has common port 6, positive output end 7 and reversed-phase output 8; Common port 6 is connected with skeleton 2, and skeleton 2 is connected with ground when microwave oven is installed, and the anode of magnetron 30 is connected with ground.Common port 6, positive output end 7, first high-voltage fuse 9, first high-voltage capacitance 10 and first high-voltage diode 11 constitute the first half-wave voltage-multiplying circuit; Wherein first high-voltage diode, 11 outputs are connected with the anode of magnetron 30; The first half-wave voltage-multiplying circuit is connected with heating circuit through the 3rd high-voltage diode 12, and the 3rd high-voltage diode 12 outputs are connected with first high-voltage diode, 11 inputs.Common port 6, reversed-phase output 8, second high-voltage fuse 13, second high-voltage capacitance 14 and second high-voltage diode 15 constitute the second half-wave voltage-multiplying circuit; Wherein second high-voltage diode, 15 outputs are connected with magnetron 30 anodes; The second half-wave voltage-multiplying circuit is connected with heating circuit through the 4th high-voltage diode 16, and the 4th high-voltage diode 16 outputs are connected with second high-voltage diode, 15 inputs.In each half-wave; One of them half-wave voltage-multiplying circuit is to the high-voltage capacitor charging in this half-wave voltage-multiplying circuit; Another one half-wave voltage-multiplying circuit carries out the work of voltage stack driven magnetic keyholed back plate; So all export same power at each half-wave mesohigh transformer, the 3rd high-voltage diode 12 and the 4th high-voltage diode 16 also have the function of the surge when blocking magnetron 30 startups except stoping positive output end 7 and reversed-phase output 8 connections.

Embodiment 2; In conjunction with Fig. 2; Embodiment 2 is not to be connected to come ground connection with skeleton 2 at the common port 6 of secondary winding 4 with the difference of embodiment 1; But the output of increase the 5th high-voltage diode 17, the five high-voltage diodes 17 is connected with ground between common port 6 and ground, and the effect of the 5th high-voltage diode 17 is to strengthen the ability of anti-surge.The not direct ground connection of the output of first high-voltage diode 11 and second high-voltage diode 15, but be connected with the input of the 5th high-voltage diode 17

Embodiment 3, and in conjunction with Fig. 3, embodiment 3 is common port 6 direct ground connection with the difference of embodiment 1.

Embodiment 4, and in conjunction with Fig. 4, embodiment 4 is that with the difference of embodiment 3 the 4th high-voltage diode 16 usefulness high-voltage diodes 18 are composed in series with high-voltage diode 19, and same situation also can appear on the devices such as other high-voltage diode or high-voltage capacitance.

Embodiment 5, and in conjunction with Fig. 5, embodiment 5 and the difference of embodiment 1 temperature insurance device 20 that is in elementary winding 3, to connect replaces first high-voltage fuse 9 and second high-voltage fuse 13, and elementary winding 3 is the windings with three power inputs.

Claims

1. a microwave oven comprises magnetron and high-tension transformer, and high-tension transformer comprises skeleton, Filament Winding, secondary winding and elementary winding again, and Filament Winding and magnetron cathode connect to form heating circuit, and anode of magnetron ground connection is characterized in that:

Said common end grounding.

2. according to the said microwave oven of claim 1, it is characterized in that: said common port is connected with skeleton, skeleton ground connection.

3. according to the said microwave oven of claim 1, it is characterized in that: said common end grounding, common port and skeleton open circuit.

4. according to the said microwave oven of claim 1, it is characterized in that: said common port is connected with the 5th high-voltage diode input, the 5th high-voltage diode output head grounding.

5. according to the said microwave oven of claim 4, it is characterized in that: the said second high-voltage diode output, the 4th high-voltage diode output are connected with the input of the 5th high-voltage diode.

6. according to the said microwave oven of claim 1, it is characterized in that: have at least a winding to connect in said Filament Winding, secondary winding and the elementary winding with the Temperature protection device.