Micro-wave oven soft starting method and starting apparatus

A starter device and microwave oven technology, applied in microwave heating, etc., can solve the problems of increasing cost, increasing thermistor, complex hardware circuit, etc., achieving the effect of simple and feasible cost, and reducing the opening current

Active Publication Date: 2008-12-31
SHENZHEN H&T INTELLIGENT CONTROL
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The disadvantage of this method is that due to the increase of the thermistor, the hardware circuit is more complicated and the cost is increased.

Method used

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  • Micro-wave oven soft starting method and starting apparatus
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  • Micro-wave oven soft starting method and starting apparatus

Examples

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Embodiment Construction

[0023] refer to figure 1 , this figure is a hardware circuit diagram of an embodiment of the microwave oven soft start method provided by the present invention; as shown in the figure, the output terminal of the magnetron Mag is connected to the base of the triode TR9 through the resistor R7, and the collector of the TR9 is connected through the resistor R51 To the gate of the thyristor SR1 and connected to the +5V power supply through a pull-up resistor, the positive and negative poles of SR1 are respectively connected to the two ends of the load.

[0024] refer to figure 2 , because in the inductive load circuit, the maximum value of voltage 1 and current 2 has a phase difference of 90°, that is, the highest point of voltage, that is, the minimum point of current. Based on the above principle, the voltage zero-crossing signal 3 can be monitored through the control of the single-chip microcomputer, and the load is turned on for a certain time after the voltage zero-crossing...

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Abstract

The invention discloses a soft starting method of a microwave oven, for a microwave oven control circuit output by silicon control magnetron microwave, comprising: setting an output end as a low level when starting the magnetron to work; starting a timer after detecting that output voltage signal of the magnetron reaches a crossover point, and setting timing interrupting time according to pulse width of the voltage; setting the output end of the magnetron as a high level at the timing breakout point of the timer, starting a load. The invention also provides a starting device of the microwave oven. The invention can effectively reduce starting current of the microwave oven, which is simple and practical, low in cost.

Description

technical field [0001] The invention relates to a microwave oven startup technology, in particular to a microwave oven soft startup method and a startup device. Background technique [0002] As we all know, a microwave oven is a device that uses microwaves generated by a magnetron to apply microwaves to a load. Because the microwave oven load is an inductive load, a voltage will be applied to the load at the moment the magnetron of the microwave oven is started, and a large current will be generated in the control circuit, up to 60-70A. Such a large current will affect the magnetron. The life of the tube has a great influence, and when it is turned on, due to the large current, it will produce a lot of noise. [0003] In the prior art, there are mainly two methods for controlling the magnetron of a microwave oven, namely, relay control and thyristor control. Among them, for the former, generally a thermistor with a positive temperature coefficient connected in parallel at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B6/68
Inventor 王志根秦宏武汪显方刘建伟董晓勇
Owner SHENZHEN H&T INTELLIGENT CONTROL
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