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Numerically controlled microwave oven with continuously adjustable power

A digital control, microwave oven technology, applied in microwave heating, household stoves/stoves, household heating, etc., can solve problems such as poor effect, uneven cooking heating, rough control methods, etc., to improve performance/price ratio, convenient The effect of upgrading and improving working life

Inactive Publication Date: 2006-06-21
NANKAI UNIV
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AI Technical Summary

Problems solved by technology

This method makes the magnetron in the switch working state, which reduces the working life of the magnetron. At the same time, the control method of this method is rough, the cooking heating is uneven, and the effect is not good. It is not convenient to carry out intelligent transformation of the existing microwave oven, which affects Product update

Method used

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  • Numerically controlled microwave oven with continuously adjustable power
  • Numerically controlled microwave oven with continuously adjustable power
  • Numerically controlled microwave oven with continuously adjustable power

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Embodiment Construction

[0018] The voltage regulating circuit board (6) is installed in the microwave oven box ( Figure 5 ), it is composed of three parts: zero-crossing detection circuit, single-chip microcomputer control circuit, triac trigger circuit, wherein the zero-crossing detection circuit is composed of T 3 , U 5 (LM339), U 3 (74LS123) and U 2 , (74LS02), the input signal is industrial frequency alternating current (220V, 50HZ) through the transformer T 3 It becomes AC 5V and sent to the voltage comparator U through R6, R5 and C5 5 (LM339) non-inverting and inverting input terminals, it is in U 5 (LM339) output terminal 2 forms a square wave with a pulse width of 180°, and the square wave is respectively passed to the monostable circuit U 3 , (74LS123) on the two trigger input terminals 2 and 9, the positive and negative pulse series corresponding to the positive and negative zero crossings are output at the output terminals 13 and 5, and sent to the NOR gate U 2 (74LS02) 2 and 3 pins...

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Abstract

The title of the present invention is a digitally controlled power continuously adjustable microwave oven, which belongs to the technical field of electric appliances. The power of existing microwave ovens is not continuously adjustable, and the power is adjusted indirectly by using relays to control the on-off of the working power of the magnetron to control the ratio of the full-power emission time to the stop working time. The technical solution is to separate the magnetron filament transformer from the chamber voltage transformer, and add an intelligent voltage regulation circuit board to the primary stage of the chamber voltage changer, so that the power of the microwave oven can be continuously adjusted, and at the same time, the life of the magnetron is improved, and the cooking effect is good. , Simple, easy to promote.

Description

technical field [0001] The title of the present invention is a digitally controlled power continuously adjustable microwave oven, which belongs to the technical field of electric appliances. Background technique [0002] The microwave power of the existing microwave oven is not continuously adjustable, it uses the relay to control the power supply of the magnetron to control the ratio of the full power emission time to the stop working time, and indirectly achieves the purpose of power regulation. This method makes the magnetron in the switch working state, which reduces the working life of the magnetron. At the same time, the control method of this method is rough, the cooking heating is uneven, and the effect is not good. It is not convenient to carry out intelligent transformation of the existing microwave oven, which affects Product replacement. Contents of the invention [0003] The purpose of the present invention is to design a digitally controlled power continuous...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24C7/02F24C7/08H05B6/68H05B6/80
Inventor 李维祥孙桂玲杨文霞刘凤先
Owner NANKAI UNIV
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