JPH0268882A - High frequency heating device - 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 the Invention The present invention relates to a high-frequency generator of a high-frequency heating apparatus that uses high-frequency waves to heat and cook food, and a time limit of a time limit device.

2. Description of the Related Art As shown in FIG. 5, a high-frequency generator for a general microwave oven forms a half-wave voltage doubler rectifier circuit with a high-voltage capacitor 1 and a high-voltage diode 2, and a secondary winding 4 of a high-voltage transformer 3.
, and magnetron 5 is connected in parallel to high voltage diode 2.
was connected and configured. Furthermore, in order to set the heating time of the food, a time switch 6 as a timer is connected in series with the primary winding 7 of the high voltage transformer 3 to protect the commercial power source 8. However, with such a high frequency generator, even if the high frequency output at the commercial frequency of 50 Hz is 500 W, at 60 Hz a high frequency output of 600 W or more can be obtained.
There was a problem that the food would be overcooked if the heating time was fixed. For this reason, conventionally, dedicated high-voltage transformers, high-voltage capacitors, and time switches were used to maintain a constant high-frequency output depending on the commercial frequency.

As another method, as shown in Fig. 6, the high-voltage capacitor 9 of the high-frequency generator has two capacitances, and a switching relay 10 is provided to switch the capacitance according to the commercial frequency 8, thereby keeping the high-frequency output constant. Ta. (Tokuko Showa 53-1
9091 Publication) Problems to be Solved by the Invention However, the use of a dedicated high voltage transformer, high voltage capacitor, and time switch depending on the commercial frequency as in the former case is difficult to achieve even though the model is the same model as the 50H2 specification, 6
The product had to be manufactured using different parts while taking into account the 0Hz specification, which caused problems in terms of production management and commercial management. Furthermore, when a consumer moves to an area with a different commercial frequency after purchasing a microwave oven, it is necessary to replace it with a dedicated high-voltage transformer, high-voltage capacitor, or time switch that corresponds to the frequency, which burdens the consumer with the cost of parts. There was also the problem that it took time and effort to replace the product at the store.

Furthermore, the latter method also requires a microprocessor to determine the commercial frequency, or requires a changeover switch to be provided outside the device so that the user can switch according to the commercial frequency. As a result, parts costs were high, and there were safety issues due to malfunctions of the microprocessor and erroneous operation of the changeover switch on the outside of the device.

The present invention solves these conventional problems,
To provide an excellent high-frequency heating device that has a simple configuration and can heat food regardless of the commercial frequency of 50 Hz or 60 Hz.

Means for Solving the Problems The high-frequency heating device of the present invention includes a high-frequency generator consisting of a high-voltage transformer, a high-voltage capacitor, a high-voltage diode, and a magnetron, and a commercial power supply connected to the primary winding of the high-voltage transformer, which is turned on and off according to time limits. Equipped with a time switch, a scale showing numbers or symbols corresponding to the time limit, and a pointer for setting the time limit, the high frequency output obtained with a 60 Hz commercial power supply is 1.1 of the high frequency output obtained with a 50 Hz commercial power supply. Configure the high frequency generator to increase the frequency by ~1.3 times,
When the time switch is driven by a synchronous electric motor and the time switch is operated by aligning the pointer with the same number or symbol on the scale, the time limit obtained with a 50Hz commercial power supply is 6.
It is configured so that the time limit is 1.2 times that obtained with a 0Hz commercial power supply.

Function The high frequency generator for a microwave oven of the present invention is configured so that the high frequency output obtained from a 60H2 commercial power source is 1.1 to 1.3 times the high frequency output obtained from a 5 Q Hz commercial power source, and the time Even if the switch is driven by a synchronous motor and the time switch is operated by matching the pointer to the same number or symbol on the scale, the time limit obtained with a 50Hz commercial power source is 12 times the time limit obtained with a 60Hz commercial power source. Since it is configured so that
The integrated amount of the product of high-frequency output and heating time to heat food at 60Hz A6 is almost the same, and almost constant energy is given to food regardless of the commercial frequency of 50Hz or 5QHz, which results in uniform food production. Allows cooking. Furthermore, there is no need to use a dedicated high voltage transformer, high voltage capacitor, or time switch for 5QHz and 60Hz, and there is no need to use a switching immersion capacity high voltage capacitor or changeover switch for 50H2 and 60Hz. .

EXAMPLE Hereinafter, a high frequency heating device according to an example of the present invention will be explained with reference to the drawings.

As shown in FIG. 1, the operating unit 11 has a scale 12 showing numbers corresponding to the cooking time of the food, a knob 14 that rotates in conjunction with the time switch main shaft 13, and a pointer 15 on the knob 14. It consists of In addition, as shown in FIG. 2, a half-wave voltage doubler rectifier circuit is formed by a high-voltage capacitor 16 and a high-voltage diode 17, and the high-voltage transformer
A time switch is connected to the next winding 19, and a magnetron 20 is connected in parallel to the high voltage diode 17 to form a high frequency generator, and is driven by a single stage electric motor 21 as a timer to set the heating time of the food. 22 is connected in series with the primary winding 23 of the high voltage transformer 18 to protect the commercial power source 8. This high frequency generator sets the relationship between the primary voltage of the high voltage transformer 18 and the high frequency output to a commercial frequency of 50 Hz,
As shown in Fig. 3, which shows a comparison for every 60 Hz, when the primary voltage of the high voltage transformer 18 is 100 V, the high frequency output of 50) 1 z is set as P2O, and the high frequency output of 60 Hz is set as P2O.
Then, the configuration is such that the relationship is P2O-1, 2XP50. Furthermore, since the time switch 22 is driven by the synchronous electric motor 21, when setting the heating time, even if the pointer 15 of the knob 14 of the time switch 22 is set to the number on the scale 12, the rotational speed of the synchronous electric motor 21 will be lower than the frequency. Since there is a proportional relationship, the time limit of 50Hz is set to 750,
If the time limit of 60Hz is 760, T50=1.2XT
There will be a relationship of 60. Therefore, the integrated amount by the product of the high frequency output and heating time to heat food at 50 Hz, and 60 Hz.
Hz, the integrated amount by the product of the high frequency output and heating time that heats food becomes low, and the commercial frequency of 5QHz,
A constant amount of energy is given to the food regardless of the frequency of 60Hz, which enables uniform food cooking. In addition, 50
There is no need to use high-voltage transformers, high-voltage capacitors, or time switches dedicated to Hz and 60Hz, and there is no need to use dual-capacity high-voltage capacitors or changeover switches that switch between 50Hz and 60Hz, which improves production management. In addition to being advantageous in terms of product management, when a consumer moves to an area with a different commercial frequency after purchasing a microwave oven, there is no need to replace the dedicated high-voltage transformer, high-voltage condenser, or time switch that corresponds to that frequency. Consumers no longer have to pay for parts or have to replace them at a retail store, which is even more advantageous.

The operation unit 11 has a scale 12 representing numbers corresponding to the cooking time of the food, and a time switch main axis 13.
A knob 14 that rotates in conjunction with the time switch and a pointer 15 are provided on the knob 14, and as shown in FIG. 4, the knob 25 that rotates in conjunction with the time switch main shaft 24 corresponds to the time for cooking the food. The same effect can be obtained by setting a numerical scale 26 and a pointer 28 on the operating section 27, and aligning the number on the scale 26 of the knob 25 of the time switch 22 with the pointer 28 when setting the heating time. Needless to say.

Effects of the Invention As described above, the high frequency generator for microwave ovens of the present invention has the following advantages:
The integrated amount obtained by multiplying the high frequency output and heating time for heating food is the same regardless of the commercial frequency of 5Q) 4z or 60Hz, and the same energy is applied to food, making it possible to cook food uniformly. , has the following effects.

■ Even if the model is the same, it is no longer necessary to use dedicated high-voltage transformers, high-voltage capacitors, time switches, etc. depending on the 50Hz or 60Hz specifications, and it is now possible to use dedicated parts depending on the frequency during production, and to set characteristic standards for product inspection. There is no longer a need to switch or display shipping classifications, which improves productivity.

■ Since there is no longer a division into 50Hz specifications and 60Hz specifications, there is no longer a need to store products separately when they are in stock, and there is no longer a need to ship products according to the commercial frequency. In addition, as in the past, we can predict the demand according to the commercial frequency area and stock it, so even when there is a shortage in one frequency area and a surplus in another area,
This eliminates the need to transport products regionally or modify the frequency-specific parts of products, making it extremely convenient in terms of product management.

0 Even if a consumer moves to an area with a different commercial frequency after purchasing a microwave oven, there is no need to modify the frequency-specific parts of the product, eliminating the burden of parts costs on the consumer and the hassle of replacing them at a retailer. It turned out to be very convenient.

■ Depending on the commercial frequency to be used, there is no need for extra electronic circuits such as a microprocessor, 2-capacity high-voltage capacitor, or changeover switch to determine the commercial frequency, so malfunction of the microprocessor or changeover switch is prevented. It is possible to prevent the occurrence of danger due to

Alternatively, a method in which a changeover switch is provided outside the device body and the user switches the switch according to the commercial frequency can also prevent the user from forgetting to operate the switch or from erroneously operating the switch.

[Brief explanation of the drawing]

Fig. 1 is a front view of the operating section in one embodiment of the present invention, Fig. 2 is a circuit diagram showing the configuration of the same high-frequency heating device, and Fig. 3 is the primary voltage and high-frequency output of the high-voltage transformer of the high-frequency generator. FIG. 1 is a characteristic diagram showing the relationship between 8...Commercial power supply, 11.27...Operation unit, 12.26...Scale, 13.24...
...Time switch main axis, 14.25...Knob, 15.28...Pointer, 21...
Synchronous motor, 22...Time switch. Name of agent Patent attorney Shige Takashi Awano Idiot 1 person 2 Figure 3 Figure tt-8 Sakubu 12- Scale 13°°- Time switch main shaft 14-Full reading 15--2 Kutsu Iku ↑ 1st evening meal Figure diagram

Claims (1)

[Claims] A high-frequency generator consisting of a high-voltage transformer, a high-voltage capacitor, a high-voltage diode, and a magnetron, and whose high-frequency output obtained from a 60Hz commercial power supply is 1.1 to 1.3 times the high-frequency output obtained from a 50Hz commercial power supply; It is equipped with a time switch that turns on and off the commercial power supply connected to the primary winding of the high-voltage transformer according to a time limit, a scale that indicates numbers or symbols corresponding to the time limit, and a pointer for setting the time limit. When the time switch is operated with the pointer set to the symbol, the time limit obtained with a 50Hz commercial power source is 12 times the time limit obtained with a 60Hz commercial power source.
A high frequency heating device configured to drive the time switch with a synchronous motor so as to double the time.