JPH0221591A - Cooking utensil - 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 protection device for ensuring safety and malfunction of devices caused by abnormal voltages generated when lightning strikes power transmission lines or the like.

Conventional technology In recent years, with the development of LSI, the adoption of LSI in cooking appliances has become common, and the use of LSI allows for the assembly of complex cooking sequences, and the use of various sensors such as humidity sensors and humidity sensors for automatic cooking. is progressing.

However, as these control functions become electronically controlled using LSI, and as cookers become smaller, various electric components are placed in a centralized manner, and abnormal high voltages coming from the power supply side of the cooker become more and more difficult. Weaknesses (destruction and malfunction) have been highlighted closely. In particular, studies are underway to deal with the pulse-like abnormal voltages that occur when lightning strikes power transmission lines or substations. On the other hand, in response to these
Conventionally, an absorption element such as a varistor is installed between the two poles of the power supply to absorb these abnormal high voltages, but
In some cases, the protection function between earths is provided by a spatial spark gap, etc., but its performance changes significantly depending on the spark gap distance, weather conditions, and installation location, and stable performance is not achieved. is the current situation. In response to this, recently, individual components have been designed to withstand abnormally high voltages, and materials with good tracking properties are used to prevent insulation deterioration from spreading over the entire surface even if creeping discharge or space discharge occurs due to abnormally high voltages. Measures have been taken. However, as mentioned above, as cooking appliances become smaller, various electrical components are placed in a concentrated manner, and creeping discharge or space discharge occurs between the electrical components, causing damage to the electronic control section centered on the LSI, which is the main part. Currently, in order to ensure creepage distances and spatial distances between electrical parts, there are restrictions on the mounting of parts, and separate parts such as insulating sheets are used.

Problems that the invention aims to solve The present invention solves the above-mentioned conventional problems.

With a simple configuration, it can protect against abnormal high voltage between the power supply and ground.
This prevents creepage and space discharge between electrical components, and prevents destruction and malfunction of control units of LSIs, electronic components, etc.

Means for Solving the Problems In order to achieve the above object, the present invention is configured with LSI, electronic components, etc., and is capable of executing and
It has a structure in which a side wall (barrier) is provided on a door switch that provides a signal to a control section that performs control and display.

Effect: The above configuration has the effect of not discharging in response to abnormally high voltage coming from the power supply side, thereby preventing malfunction and destruction of the control function.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 2 shows an external view of a high-frequency heating device that is an embodiment of the present invention. Reference numeral 1 denotes a main body of a high-frequency heating device, and a heating chamber 2 is provided within this main body 1. The opening of the heating chamber 2 is provided with a door 3 that can be opened and closed in order to take in and take out the food in the heating chamber 2. On the front side of the main body 1, an operating section 4 for displaying and controlling settings such as cooking time and output, and an open/close button 6 for opening the door 3 are provided.

FIG. 3 shows a circuit diagram of an embodiment of the present invention. 6
A control section provided in the operation section 4 is mainly composed of LIS and electronic components (low voltage transformers, diodes, etc.), and executes, controls, and displays set cooking sequences. 7 is the power fuse, which is installed closest to the power source such as an outlet, and is damaged inside the main unit 1.

This is the position on the circuit that allows for the safest treatment in the event of an electrical leakage. Reference numerals 8, 9, and 10 are door switches that stop high-frequency oscillation in conjunction with the opening and closing of the door 3, and the door switch 1o controls the opening/closing state of the door 3 by controlling the control unit 6.
It is something that can be conveyed to people.

Reference numeral 11 denotes a temperature switch provided to prevent abnormal temperatures within the heating chamber 2 and to protect the magnetron 12 as a high frequency oscillation source. Reference numeral 13 denotes a varistor provided to absorb abnormally high voltage generated between the poles of the power line due to dropping or the like.

Now, FIG. 4 shows a side view of an embodiment equipped with a door switch of the present invention. 14 is a door hook (resin) installed inside the main body 1, with the door switch 8 on the upper side and the door switch 9. The door switch 1o with side wall (barrier) 1Oa is on the lower side (looking at the drawing, 9 is on the back side, 1 is on the front side)
0). The door 3 is composed of a door E15, a door key 16, and a spring 1.
moves up and down. The figure shows the door 3 closed, and the door switch 8 can be operated directly with the door key, and the door switch 9 can be operated directly with the door key.
．． 10 is a spacer 18 provided on the door hook 14.
The switch is closed by two rotations of movement 19. Also, door 3 is
A of the spacer 19 is pressed by the lift button 6 (not shown).
When the door key 16 is pushed up, each door switch opens at the same time, and s3 opens. FIG. 1 is a perspective view of the installation of the door switches 9 and 10, and FIG. 5 shows the state of wiring to the door switches 9 and 10. 20.21 is the terminal of the door switch 9, 10 (
22°23 is the lead sensor terminal and 24
．． 25 is a case of a lead sensor terminal. Figure 6 shows
It is a diagram of the same system.

Hereinafter, the effects of the above configuration will be explained.

When a pulse-like abnormal high voltage generated by a lightning strike is transmitted between the two poles of the main body 10 through the power cable and between the live part and the ground, the voltage generated between the two poles is transmitted to the varistor 13.
absorbed into. On the other hand, regarding what occurs between the charging section and the ground, the door switch 9 on the charging side and the control section 5 (LSI) on the ground side.

An abnormally high voltage is applied between the door switch 10 (electronic parts, etc.), causing destruction or malfunction of the control unit 5 due to creeping or space discharge. By providing the rear) 10a, sufficient creepage distance and spatial distance between the switches are ensured, no discharge occurs, and the control section 6 always operates normally. Generally, the abnormal high voltage is about eKV, but if the door switch 20 does not have a side wall, the abnormal high voltage is about 6 to aKV and creeping.
A blank discharge occurs, leading to destruction of the control unit and malfunction.

On the other hand, in the door switch 1o of the present invention, 1 s
It can be applied to an abnormally high voltage of xv.

The wall part (barrier) of the door switch may be provided on the door switch 9 side, or if three door switches are stacked, the wall part (barrier) f is provided on both sides.
It is sufficient to provide c. Furthermore, if there is no case for the IJ-desen terminal, it is sufficient to provide the wall part (2) (rear) up to the top of the lead-sen terminal.

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

(1) It is possible to effectively absorb abnormal high voltages caused by lightning strikes, etc., to prevent malfunctions and damage to the control functions of control units (LSIs, heavy components, etc.), and to supply highly safe products.

(2) Creepage distance and spatial distance can be easily secured, and stable performance can be obtained without being affected by weather conditions.

(3) Installation (installation with distance between electrical parts).

There are no restrictions on configuration (separate installation of electrical components), etc., allowing electrical components to be stacked, simplifying the configuration, and making it more compact.

[Brief explanation of the drawing]

FIG. 1 is a perspective view 1 of essential parts of a cooking device which is an embodiment of the present invention.
．． Fig. 2 is a perspective view of the same external appearance, Fig. 3 is a circuit diagram, Fig. 4 is a side view of the main part, Fig. 5 is a front view of the main part, and Fig. 6 is an explanatory diagram showing the system. . 1...Main body, 2...Heating chamber, 3...
...Door, 4...Operation unit, 6...Control unit, 8,9.10...Door switch, 10
a...Side wall (barrier). Name of agent: Patent attorney Shigetaka Awano and one other person
6 Cause

Claims (1)

[Claims] A main body, a heating chamber provided in the main body and having an opening on the front side, a door that opens and closes the front opening of the heating chamber, a switch mechanism for the door that operates when the door is opened and closed, and the main body. What is claimed is: 1. A cooking appliance comprising: an operating section on the front surface of the cooking appliance; and a switch having a wall section provided on the side surface of the terminal in the switch mechanism of the door.