JPS60262385A - High frequency heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is characterized by 1. The present invention relates to a high-frequency heating device equipped with two high-frequency optical ILF devices in the S and M frequency bands (industrial, scientific, and medical), 2450 MHz band and 915 MHz band.

Conventional configuration and its problems High-frequency heating requires 1. 2 recognized as S and M frequencies
One of the two frequencies, the 450 MHz band and the 91'5 MHz band, is often used, and currently there are overwhelmingly many high-frequency heating devices that use the 2450 MHz band with a magnetron as the oscillation source.

On the other hand, high-frequency heating devices using the 915 MHz band are also being reconsidered in recent years because low frequencies are advantageous for solid-state oscillation circuits using transistors and the like.

Both are used for high-frequency heating, but due to their different wavelengths, there are differences in the degree of penetration into the food and radio wave distribution within the heating chamber.In addition, solid-state oscillation using transistors and other devices used in the 915 MHz band Circuits have advantages and disadvantages for each frequency, such as low efficiency and difficulty in increasing power consumption.

Purpose of the Invention The present invention has advantages and disadvantages between 2450MHz and 915MHz.
The purpose of the present invention is to inexpensively provide a high-frequency heating device with high output and high efficiency, which has little unevenness in cooking performance, that is, by using high-frequency waves having two frequencies of z.

In order to achieve one of the objectives of the invention, the present invention
A magnetron that generates a high frequency band, and a high J1'il whose output in the 915 MHz band is approximately 1/2 or less than that of a Macnetron.
The solid-state oscillator circuit that generates 74㎜ and the output control of these two high-frequency sources are used to control the output of radio waves in the two frequency bands.
This is equipped with an output control device that adjusts the ratio to iJK. With this I7#1 configuration, it is possible to select the optimal radio wave output for each cooking category such as the type and amount of food to be heated, resulting in excellent cooking.
! A high-frequency front # that has I+ ability and is highly efficient! 4Ai
i'II can be realized at low cost.

Description of examples Embodiments of the present invention will be described below with reference to the drawings.

In the drawing, the heating chamber IK does not accommodate the heated object 2,
, 6, 4, 11, 2゜2. . Yo. Ya 24. .

High frequencies of MHz and 915 MHz are introduced through antenna 4 and antenna 10, respectively. The magnetron 3 is a high frequency source that generates a high frequency in the 2450 MHz band, and the solid state oscillation circuit 9 is a high frequency source in the 915 MHz band.
The high-frequency outputs are 600W and 100W, respectively. The high-voltage transformer 78, high-voltage capacitor 6, and diode 5 constitute a high-voltage power source for driving the magnetron 3. By selecting high-voltage capacitors 6a, 6b, and 6c with different capacities with the high-voltage switch 7,
Output proportional to capacity, in this example 600W, 300W
W, 100W can be obtained.

The solid-state oscillator circuit 9 is driven by a power source consisting of a 1-ra/nu 13 and a rectifying and smoothing circuit 12 that rectifies and smoothes this output J. It is controlled in the form of a change in the average amount J by turning it on and off in a sufficiently short time period, for example, a period of about 30 seconds.

Furthermore, a switch 14 is provided for controlling on/off the input voltages of both the high voltage transformer 8 of the magnetron 1-3 and the power transformer 713 of the solid state oscillation circuit 9.

II'lIH self switch 7.11.14f microconhi.

It is controlled by a control circuit 15 constituted by a multiplex circuit such as a user, and its control contents are changed and selected in accordance with instructions inputted from a control panel 16. Further, the switches 7, 11, and 14 may be simply relay switches having a 1° coil and 1θ coil, or may be solid state switches using semiconductor elements such as triacs.

Next, an example of the operation of the high-frequency heating device configured as described above and its effects will be described. Consider two operating modes, mode 1 and mode n, as the most typical operating modes. In mode 1, the oscillation output of magnetron 3 is 600W.
Switch 7 is installed so that 245
In addition to the 0 MHz output, the solid-state oscillator circuit 9 also outputs -1 MHz.
At the same time, radio waves of 915 MHz and a total of 700 W are applied to the heating chamber 1 as high-frequency waves. On the other hand, in the case of mode ■, switch 7 selects high voltage capacitor 〇〇 so that the oscillation output of Magui-Tron 3 becomes 100W. Therefore, 2450 MHz and 915 MHz are each 1
00W, a total of 200W of high frequency power is applied to the heating chamber 1. In this way, the output of 2450 MHz is changed by the switch 7, and therefore the output ratio of 2450 MHz and 915 MHz and the total output are changed.

By switching the operation mode as described above, whereas conventional high-frequency heating simply changes the output depending on the type of cooking, it is possible to change the output above a certain level, such as for general cooking or reheating. If you need efficiency, choose Mort River,
If you want to avoid local heating as much as possible and heat the inside as much as possible, such as when defrosting or cooking eggs, use 915, which has a large penetration depth.
You can use the characteristics of the two types of frequencies to suit your cooking, such as selecting a moder that has a large MHz ratio and a small overall output, and can be expected to have an effect of uniformizing temperature distribution through heat transfer.

Effects of the Invention As described above, the high-frequency heating device of the present invention can solve the following problems:
It is better to have a relatively low output power, such as when cooking eggs, and for cooking that requires heating as uniformly as possible to the inside of the food, 915MHz, 100W, and 2450MHz of about 100W are recommended. By adding radio waves, it is possible to achieve an effective heating state. - For power, general cooking, and heating, heating can be performed using a high output of about 600W at 2450MHz. Moreover, since the 2450MHz uses a magnetron, it is highly efficient, compact, and inexpensive, and can provide high output, but the 915MHz
Since it has a small output after 100W iin, it can be realized in a relatively compact manner using a solid-state oscillation circuit, and in terms of efficiency and cost, the influence on the entire high-frequency heating device is kept to an extremely small range. As described above, according to the configuration of the present invention, it is possible to provide a high-frequency heating device that has excellent cooking performance, is highly effective, and can output a large output as required at a low cost.

[Brief explanation of the drawing]

The figure shows a high frequency heating device J17 showing one embodiment of the present invention.
-j, M Nltヮ1□lAh.

Claims (2)

[Claims] (1) A pair of high-frequency sources, a magnetron and a solid-state oscillator circuit, each generating a high frequency wave in a first frequency band and a high frequency wave in a second frequency band; A high-frequency heating device comprising: a heating chamber that introduces both high-frequency waves in the frequency bands; and an output control device that varies the ratio of high-frequency outputs of the high-frequency sources in the pair of frequency bands. (2) Set the maximum value of the high frequency output of the solid-state oscillator circuit to Magnet 1.
- The high-frequency heating device according to claim 1, wherein the high-frequency output is approximately one-half or less of the maximum value of the high-frequency output.