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A microwave oven magnetron preheating control method and control circuit

A magnetron preheating and control method technology, which is applied in the microwave oven magnetron control circuit and the microwave oven magnetron preheating control field, can solve the problems of increasing the complexity of the control circuit and inconvenient actual operation, and achieves simple structure and high efficiency. Long service life, uniform heating effect

Active Publication Date: 2015-10-14
刘新保
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the complexity of the control circuit will be greatly increased, so the general magnetron filament preheating control circuit is very inconvenient in actual operation, and it is necessary to use a new control method and control circuit to solve such problems

Method used

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  • A microwave oven magnetron preheating control method and control circuit
  • A microwave oven magnetron preheating control method and control circuit
  • A microwave oven magnetron preheating control method and control circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: The microwave oven magnetron preheating control method of the present invention, for a microwave heating source composed of n magnetrons, n AC contactors are used to control and connect n magnetrons respectively, and the n AC The contactor is connected to the PLC under control, and the closing and opening of the AC contactor is controlled by programming the output signal of the PLC, so that m of the n magnetrons work first, and the filament of the m+1th magnetron is turned on , to preheat it; then stop the first magnetron every 90 to 200 seconds, start the m+1th magnetron, and start the m+1th magnetron at the same time to make the m+2th magnetron Turn on the filament of the control tube to preheat it; then stop the second magnetron every 90 to 200 seconds, start the m+2 magnetron, and start the m+2 magnetron at the same time The filament of the m+3th magnetron is turned on to preheat it until the nth magnetron is started, and at the same time the filament ...

Embodiment 2

[0022] Embodiment two: see figure 1 , figure 2 , this embodiment is a single-phase microwave oven magnetron control circuit for realizing the preheating control method of microwave oven magnetron as described above, including PLC, n AC contactors, n magnetrons and their power supply circuits, n AC The contactor is correspondingly connected to n magnetrons, and the n AC contactors are respectively controlled and connected to the PLC. The primary winding of the transformer in each magnetron power supply circuit is connected through the first set of normally open contacts of the corresponding AC contactor. power supply, each AC contactor is provided with a third set of normally open contacts connected in series between the secondary high-voltage winding of the transformer in the corresponding magnetron power supply circuit and the voltage doubler rectifier capacitor; at the same time, each AC contactor is provided with The second group of normally open contacts starts from the ...

Embodiment 3

[0030] Embodiment three: see figure 1 , image 3 , the present embodiment is to realize the three-phase microwave oven magnetron control circuit of the microwave oven magnetron preheating control method as described above, including PLC, AC contactor, magnetron and power supply circuit thereof, all connected in each phase power supply There are n AC contactors corresponding to n magnetrons connected to the control, and all AC contactors are controlled and connected to the PLC respectively. In each phase, the primary winding of the transformer in each magnetron power supply circuit passes through the first AC contactor. A group of normally open contacts is connected to the phase power supply, and each AC contactor is provided with a third group of normally open contacts connected in series between the secondary high voltage winding of the transformer in the corresponding magnetron power supply circuit and the voltage doubler rectifier capacitor; At the same time, each AC conta...

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Abstract

The invention relates to a microwave oven magnetron preheating controlling method and controlling circuit. For a microwave heating source which comprises n magnetrons, n alternating current contactors are used for respectively and correspondingly controlling and being connected with the n magnetrons, the alternating current contactors are controlled by and connected with a programmable logic controller (PLC), the alternating current contactors are controlled to be closed and broken through the fact the that the PLC is programmed to output signals, m magnetrons in the n magnetrons are enabled to work, a lamp filament of an m+1 magnetron is powered on, and the m+1 magnetron is preheated; after 90-200 seconds, a first magnetron is stopped from working, the m+1 magnetron is started, a lamp filament of an m+2 magnetron is powered on, and the m+2 magnetron is preheated; and then after 90-200 seconds, a second magnetron is stopped from working, the m+2 magnetron is started, a lamp filament of an m+3 magnetron is powered on, and the m+3 magnetron is preheated, and until an n magnetron is started, a circulation is completed. The microwave oven magnetron preheating controlling method and controlling circuit solves the problems that an existing microwave heat processing device is complex in structure, high in cost, inconvenient to use and maintain and the like and largely improves the service life of the magnetrons.

Description

technical field [0001] The invention relates to a microwave oven magnetron filament preheating control, in particular to a microwave oven magnetron preheating control method and a microwave oven magnetron control circuit. Background technique [0002] Microwave oven is a kind of heat treatment equipment that uses microwave treatment to interact materials with microwave field. Microwaves are absorbed by materials and converted into heat energy, and the whole material is heated from inside. The use of microwaves for heat treatment has been more and more widely used in the field of heat treatment due to its advantages of energy saving, rapid heating without thermal hysteresis, and interaction with substances. [0003] The magnetron is an important part of the microwave oven, the core component of the microwave heat treatment system, and a large part that is relatively easy to damage in the microwave oven, so it must work in a normal state during use. A magnetron consists of a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B6/68
Inventor 刘新保贾晓林
Owner 刘新保
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