JPS5973883A - 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 the Invention The present invention relates to an electric circuit configuration of a high-frequency heater that heats uncooked food using microwaves.

Conventional configuration and its problems In high-frequency heaters that use microwaves to heat food in the heating chamber, a door is installed in the front of the heating chamber so that food can be taken in and out of the heating chamber freely. It is set up. During cooking, the interior light that illuminates the interior of the refrigerator turns off when the door is opened, making the interior of the refrigerator dark and making it difficult to see the food inside. This problem was solved by implementing the circuit configuration provided. A switch is provided that is linked to the opening and closing of the door, and when the door is opened, as shown in Figure 1,
Power is supplied only to the lamp for the interior light, and the lamp is turned on. Also, when the door is closed, the relay is open, so the light is normally off, but when a control function signal that receives an external start signal is given to IJ 14-, and the relay closes, the lamp turns off. Light.

However, the switch that is linked to opening and closing the door is a latch switch that stops high-frequency oscillation and radio waves to ensure safety when the door is opened, and a latch switch that receives control function signals and operates according to the instructions. The configuration is such that the relay is short-circuited to ensure reliability and further safety.

Switches mainly operate mechanically, but when the contacts are short-circuited due to damage or failure due to the durability or impact force of opening and closing the door, there are launch switches and relays that maintain the safety mentioned above. There is a hidden danger that the function of the device may be lost.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks by turning on and off the interior light in conjunction with the opening and closing of the door, and also by improving the functions of the launch switch and relay provided for safety purposes. The aim is not to cause any damage.

Structure of the Invention In order to achieve the above object, the present invention utilizes a microcomputer (hereinafter abbreviated as microcomputer) and installs a relay that is linked to the opening and closing of the door of the high-frequency heater and lights up the four internal lights of the high-frequency heater. The circuit configuration improves convenience by illuminating the interior of the refrigerator when putting food in and out, or when the door is open, and also ensures the functionality of parts that ensure safety, such as latch switches. This has the effect that the functions of a latch switch and the like can be sufficiently ensured.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an external view of one embodiment.

Reference numeral 1 denotes a main body of a high-frequency heater, and a heating chamber 2 is provided within this main body 1. A door 3 which can be opened and closed is provided at the front opening of the heating chamber 2 to allow food to be taken in and taken out. Main body 1
The operation panel section 4 provided on the front side of the unit includes a display tube for displaying cooking time, etc., and a microcomputer 5+ in the control section for setting the cooking time and cooking output. A keyboard is provided at L for transmitting input signals.

FIG. 2 shows a circuit configuration of an embodiment of the present invention.

The operation panel section 4 is provided with a control section 5 that controls cooking output and time, and is equipped with a microcomputer (hereinafter abbreviated as microcomputer) (6a') to control each function. It is linked to the opening and closing of the door 3, and when closed, the circuit is closed to supply power to the power transformer 6 of the high frequency heater, and
When opened, the above power supply circuit is opened to prevent high frequency oscillation from occurring. 4. Safety is required.
Chifi Cheer 8 is provided. Furthermore, a switch 9 is provided which is linked to the door 3 and transmits the opening/closing status of the door 3 to the microcomputer (5a) of the control section 5. It is equipped with a lamp 13 that illuminates the inside of the heating chamber 2 and a fan motor 14 that cools the high frequency oscillator, its power supply parts, and other parts, and a relay A10 is provided in series with each of them to receive signals from the control section 5. , the circuit is opened and closed, and the lamp 13 is turned on and off, and the fan motor 14 blows air and stops. relay 81
1 receives a signal from the control unit 6 and makes the power transformer 6 of the single-frequency oscillator intermittent, thereby intermittent high-frequency oscillation, and obtains a variable high-frequency output.

Furthermore, a relay Ago is activated as the door 3 opens and closes.

The control of relay B11 is shown in FIG.

The microcomputer (5a) knows the opening/closing status of the door 3 through the switch 9 that is linked to the opening/closing of the door 3, and for example, when the door 3 is open, the microcomputer (5a) determines whether the door is closed or not.
Since it is No, relay person 1o is ON, Riv-
At 811, an OFF control signal is issued. From the circuit diagram of FIG. 3, the latch switch 7.8 is open, and even if the relay A10 is closed, the lamp 13 is lit and the fan motor tab 14 is stopped. That is, when the door 3 is opened, only the lamp 13 is lit to illuminate the inside of the heating chamber 2. Next, when the door 3 is closed, the microcomputer (5a) activates the relay A10. Turn off the V-811 and stop everything. Next, after setting the cooking program such as the cooking time, the start signal is input.'' Relay person 10. Relay, -81
1 is turned on and lamp 13. Fan motor 14. Power is supplied to power transformer 6, high frequency oscillation is performed, and when high, relay AI'O and relay B11 are turned off and all operations are stopped. Then, as shown in FIG. 3, the original routine is returned and this process is repeated.

Also, when branching to the "NO" side midway through the process, the original routine returns in the same way.

An actual operation of the operation shown in Fig. 3 is shown in Fig. 4,
To explain, first, when the door 3 is closed and no settings are made, the latch switches 7, 8, etc. are closed because the door 3 is closed. Switch 9 is ON, but since the start signal is not input, relay A10. Relay 811 is O
It is FF, and the lamp 13. fan motor 1
4 is stopped. Next, when door 3 is opened, the latch switches 7, 8. and switch 9 is OF
F L, the microcomputer (sa') receives a signal from the switch 9 and turns on the relay A10 assuming that the door 3 is open. According to the circuit diagram of FIG. 3, voltage is applied only to the lamp 13-, a circuit is formed in the fan motor 14 that is opened by the launch switch 7, and only the lamp 13 is lit.

Next, when door 3 is closed and a start signal is given,
Relay A10. Relay B11 performs ONL and high frequency oscillation. During this process, when the door 3 is opened, a signal from the opening/closing of the switch 9 is given to the microcomputer (5a) as described above, which opens the relay B11 and stops high-frequency oscillation, but the relay A10 remains closed. When the latch switch is opened, the fan motor 14-2 stops, but the lamp 13 remains lit.

The operation from closing the door 3 again to starting the cooking time until the end of the cooking time is as shown in FIG. 4. When the cooking ends, the relay A 1o and the IJ relay 11 are opened, and the cooking time is completely stopped.

In this way, according to this embodiment, when the door is opened, the inside of the heating chamber is illuminated, making it easy to set up food and check the finished product. Furthermore, unlike conventional mechanical operations, the lamp switching operation is processed by a microcomputer program, eliminating mechanical failures and ensuring the function of a latch switch (a function that ensures safety). It has the effect of being able to.

FIG. 6 shows another embodiment of the invention.

The relay A10 is provided on the main power circuit.

By providing the relay A10 in the main power circuit, the safety function of opening and closing the main power circuit can be further increased.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) By installing a relay controlled by a microcomputer, it is possible to eliminate the switch that was used to switch on and off the lamp for the interior light in conjunction with the opening and closing of the door. etc.), it is possible to prevent the loss of the function of the switch (function to ensure safety), ensure the function of the latch switch, and provide a highly safe product.

(2) By eliminating the above-mentioned changeover switch, it is possible to reduce the number of parts and reduce costs.

(3) When using the above switch, the lamp turns on and off repeatedly as the door opens and closes.
The durability of the lamp had been degraded, but microcomputer control can reduce the number of times the lamp goes out and the number of times the lamp goes out due to opening and closing of the door can be reduced to about 0%, improving durability.

(4) By installing the fan motor in parallel with the latch switch, it is possible to use it for lamps and fans ((there is no need to provide a relay, which reduces costs.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional example, FIG. 2 is an external view of an embodiment of the present invention, and FIG. 3 is a circuit diagram of an embodiment of the present invention.
FIG. 4 is a flowchart of a microcomputer program of the present invention, FIG. 6 is an operation diagram of the present invention, and FIG. 6 is a circuit diagram of another embodiment of the present invention. 1...Main body, 2...Heating chamber, 3...
・Door, 6 ・・Control unit, 6a ・・Microcomputer-17.8 ・Latch switch, 9・
Signal switch, 10...Relay A111...
・Relay B113・・Rumpf, Group 14・Fan motor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) Equipped with an internal light that illuminates the heating chamber, a blower that cools power supply components, a latch switch that opens and closes the main power circuit in conjunction with the opening and closing of the door, and a control unit equipped with a microcomputer. In addition, a switch that detects the opening and closing of the door and a relay that turns on and off the interior light are installed, and a microcomputer detects the opening and closing of the door and drives the relay to turn on the interior light when the door is opened. A high-frequency heater configured to turn off the light when the door is closed, and turn on the light after starting. (2) Install a relay in series with the interior light, and in parallel with the interior light.
The high-rise heater according to claim 1, further comprising a blower and at least one latch switch provided in series.