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Micro-wave oven soft starting method and starting apparatus

A technology of starting device and microwave oven, which is applied in microwave heating and other directions to achieve simple and feasible cost and reduce the effect of opening current

Inactive Publication Date: 2011-03-30
SHENZHEN H&T INTELLIGENT CONTROL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

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Embodiment Construction

[0024] 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.

[0025] 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-crossin...

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Abstract

The invention discloses a starting device of a microwave oven. An ouput end of a magnetron of the microwave oven is connected to a base electrode of a triode TR9 through a first resistance R7. A collector of the triode TR9 is connected to a gate electrode of a silicon controlled rectifier SCR1 through a second resistance R51 and is connected to a power supply through a pull-up resistance. The positive and negative electrodes of the SCR1 are respectively connected to both ends of a load. The device also comprises: a magnetron starting unit to start the work of the SCR1 and to be set as a low level through the output end of the magnetron; a timing unit to start a timer after a voltage signal output from the magnetron reaches zero-crossing point, and to set a timing interrupted time according to the pulse width of the voltage; a load starting unit to set the magnetron output end as a high level at the timing interrupted time of the timer, and to start the load. The invention also provides a soft starting method 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 Patents(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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