KR100650781B1 - Structure for wiring of microwave oven - Google Patents

Abstract

The present invention discloses a wiring structure of a microwave oven, which can restructure a wiring design of a microwave oven and improve cost and productivity.

According to the present invention, the temperature switch of the microwave oven is mounted on the upper surface of the cavity of the microwave oven, and is connected in parallel with the cavity lamp CL, or, as another embodiment of the present invention, is mounted on the cavity bottom surface of the microwave oven, and the tray is Parallel connection with the motor (GM), the temperature switch is composed of a Thermostat (Normal Open Type).

Therefore, the present invention is to connect the cavity lamp CL of the microwave oven and the temperature switch mounted on the upper side of the cavity in parallel to each other, and to use the wiring of the temperature switch of the same type as the wiring of the cavity lamp CL. As a result, the wiring length of the temperature switch can be shortened and a low power wiring structure can be provided to facilitate the wiring work of the product and increase the productivity of the product.

Microwave, Thermostat, Thermostat, Cavity Lamp, Tray Motor, Wiring

Description

Wiring structure of microwave oven {STRUCTURE FOR WIRING OF MICROWAVE OVEN}

1 is a circuit diagram showing a conventional microwave oven.

2 is a circuit diagram of a microwave oven according to a first embodiment of the present invention.

3 is a circuit diagram of a microwave oven according to a second embodiment of the present invention.

<Explanation of symbols for main drawings>

201, 301: noise filter 203, 303: temperature switch

205, 305: door switch 207. 307: monitor switch

209, 309: Timer switch 211, 311: VPC switch

CL: Cavity Lamp FM: Fan Motor

GM: Tray Motor

The present invention relates to a microwave oven, and more particularly, by changing the switching structure of a temperature switch (Thermostat) used as a microwave oven and redesigning the wiring of the temperature switch therefrom, thereby increasing product productivity and cost reduction. It relates to a wiring structure of a microwave oven.

In general, a microwave oven is a device for heating / cooking food using microwaves, and includes a conventional high voltage transformer and a magnetron. This high voltage transformer generates a predetermined high voltage to drive the magnetron, which emits microwaves of high frequency (approximately 2450 MHz) in a confined space in which food is stored. The microwave thus vibrates the water molecules contained in the food, and the food is heated / cooked by molecular frictional heat generated by the vibration of the water molecules.

1 is a circuit diagram of a microwave oven for adjusting an output level according to the prior art. As shown, one end of the first and second commercial AC lines L1 and L2 is connected to the noise filter 101 on the input side to input a normal commercial AC power source AC 220V, and the other end thereof. It is connected to both ends of the high voltage transformer (HVT). The noise filter 101 includes a fuse.

Meanwhile, the fuse is connected to the first commercial AC line L1, and a temperature switch 103, a door switch 105, and a monitor switch 107 are connected to the first commercial AC line L1. The timer assembly is connected to the output terminal of the monitor switch 107. The timer assembly includes a timer switch 109 and a VPC switch 111 operated by a timer TM. In addition, the cavity lamp CL, the fan motor FM, and the tray motor GM which are interlocked according to the switching operation of the timer assembly are connected.

The temperature switch 103 is turned on / off according to the temperature of the cooking chamber to prevent overheating of the cooking chamber. For this purpose, the temperature switch 103 is mounted on the upper plate of the cavity or the bottom (bottom surface) of the cavity. In addition, the door switch 105 and the monitor switch 107 block the power supply according to the switching operation, thereby performing a safety function of the microwave oven.

However, in the conventional microwave oven circuit, as described above, as the temperature switch 103 is installed on the upper side or the lower side of the cavity, unlike the circuit diagram, the first commercial AC line L1 is used for electrons. Since it has to extend from the lower side of the stove to the upper side (or bottom) of the cavity, there is a problem in that the wiring work of the power line occurs. Such a problem is acting as a cause of reducing the productivity of a microwave oven.

In addition, it is pointed out that the wire used as the power line has to consider the total power consumption of the microwave oven, thus increasing the unnecessary production cost.

The present invention was created to solve the above problems, and an object of the present invention is to change the structure and wiring of the temperature switch used as a microwave oven, thereby increasing the ease of wiring work in the production of the product, the production cost on the wiring It is to provide a wiring structure of the microwave oven can be reduced.

The wiring structure of the microwave oven according to the aspect of the present invention for achieving the above object, in the wiring structure of the microwave oven having a temperature switch for controlling the power supply cut off according to the cooking chamber temperature of the microwave oven, wherein the temperature switch is Mounted on the upper side of the cavity of the microwave oven, connected in parallel with the cavity lamp (CL), or mounted on the bottom of the cavity of the microwave oven, connected in parallel with the tray motor (GM), and overcurrent by shorting both ends when the temperature is overheated. It is characterized in that the fuse is disconnected by inducing.

According to a preferred embodiment of the present invention, the wiring applied to the temperature switch has the same specifications (diameter, allowable current) as the wiring used for the tray motor (GM), the temperature switch is a thermostat (Thermostat), The thermostat is characterized in that the normal open type (Normal Open Type).

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a circuit diagram of a microwave oven according to a first embodiment of the present invention. As shown, a noise filter 201 including a fuse FUSE is connected to one end of the first and second commercial AC lines L1 and L2 to receive a normal commercial AC power source AC 220V. The other ends of the first and second commercial AC lines L1 and L2 are connected to a high voltage transformer HVT.

The fuse (FUSE) is connected to the first commercial AC line (L1), the door switch 205 and the monitor switch 207 is connected to the first commercial AC line (L1), the monitor switch 207 The timer assembly is connected to the output terminal of. The timer assembly includes a timer switch 209 and a VPC switch 211 operated by a timer TM. A cavity lamp (CL), a fan motor (FM), and a tray motor (GM) which are linked to the switching operation of the timer assembly are connected, and a temperature switch of a normal open type (Normal Open Type) is connected to the cavity lamp (CL). 203 are connected in parallel.

The temperature switch 203 is turned on / off according to the temperature of the cooking chamber to prevent overheating of the cooking chamber, for this purpose, the temperature switch 103 is mounted on the top of the cavity or the bottom (bottom surface) of the cavity. Thus, the temperature switch 203 is directly connected from the terminal of the cavity lamp CL mounted to the side of the cavity.

Power supplied to the microwave is provided to the door switch 205 and the monitor switch 207 via the first commercial AC line (L1). Thereafter, power is supplied to the timer switch 209 and the VPC switch 211 in response to the user's operation to operate the cavity lamp CL, the tray motor GM, and the fan motor FM. When power is supplied to the cavity lamp CL, power is supplied to the temperature switch 203 connected in parallel with the cavity lamp CL.

Here, the temperature switch 203 is a normal open type thermostat. When the overheat state of the cavity is normal, the thermostat does not operate. On the other hand, when the cavity maintains an overheated state greater than or equal to a predetermined value, the thermostat switches the contact to short both ends of the cavity lamp. Therefore, the power supply of the microwave oven causes an overcurrent to flow into the fuse FUSE by contact switching to the thermostat, thereby shutting off the system power supply of the microwave oven.

The temperature switch 203 which performs the operation of the microwave oven is mounted to the upper side or the bottom side of the cavity and installed close to the cavity lamp CL. Therefore, the electric wire for wiring the temperature switch 203 can be low-power wiring to the extent that only the power supplied to the cavity lamp CL can be accommodated, and the temperature switch 203 is close to the cavity lamp CL. As it is installed, the length of the wiring is greatly reduced.

3 is a circuit diagram showing a second embodiment of the present invention.

As shown, a noise filter 301 for removing noise on a power line by receiving commercial power (AC) and blocking overcurrent of the system, and connected to the noise filter 301 to supply power to the system. The first and second commercial AC lines L1 and L2 are connected. The first commercial AC line (L1) is supplied to the timer switch 309 through the door switch 305 and the monitor switch 307, the cavity lamp (CL), the fan motor (according to the control pattern of the microwave oven) FM) and tray motor GM are each supplied with power.

At this time, the tray motor GM is connected in parallel with the temperature switch 303, and the temperature switch 303 is a normal open type switching element, and a thermostat is used. The thermostat of the normal off type is in a normal state, that is, when the cavity temperature of the microwave oven is in the normal range, the thermostat is kept open, and when the cavity temperature is over the normal range, the thermostat is closed. It switches to (Close) state.

Meanwhile, the above-described cavity lamp CL, the tray motor GM, and the fan motor FM are wired with different thicknesses according to their respective power consumption, and the power line connected to the tray motor GM has a low power. Usable wires are wired. Therefore, the temperature switch 303 is connected in parallel with the tray motor GM, but the same specification (diameter, allowable current) as the wiring used as the tray motor GM is applied.

In addition, as the tray motor GM is mounted to the bottom of the cavity, the temperature switch 303 is also installed to the bottom of the cavity so that the tray motor GM is in close proximity to the tray motor GM. This shortens the wiring distance of the temperature switch 303 and improves the convenience of product manufacturing.

The microwave oven configured as described above is supplied with power to the cavity lamp CL, the fan motor FM, and the tray motor GM according to the user's selection of the cooking mode, and the cooking mode is performed along with the operation of the magnetron. At this time, the temperature of the cavity maintains a normal state, and thus the temperature switch 303 maintains an open state. Accordingly, the temperature switch 303 maintains an open state regardless of the operation of the tray motor GM, and thus the electrical equipment such as the tray motor GM, the fan motor FM, and the cavity lamp CL is normally driven.

Subsequently, when the temperature of the cavity becomes overheated beyond the normal state due to an abnormal state of the microwave oven, ie, excessive cooking and an error of the system, the temperature switch 303 mounted to the bottom of the cavity is caused by the heating of the cavity. Contact switching takes place. This is because the thermostat switches the contact of the open state to the closed state, and shorts both ends of the power supply of the tray motor GM connected in parallel with the thermostat.

Therefore, the power supplied to the tray motor GM is switched to the overload state due to the short of the thermostat. For this reason, the commercial power AC supplied through the noise filter 303 supplies an overcurrent due to an overload, and the fuse FUSE cuts off the supply power due to an overcurrent.

On the other hand, the microwave oven applied in the present invention can be applied to the OTR type microwave oven, of course.

 As described above, the wiring structure of the microwave oven according to the present invention connects the cavity lamp CL of the microwave oven and the temperature switch mounted on the upper side of the cavity in parallel to each other, and the wiring of the temperature switch is connected to the cavity lamp ( By using the same specification as the wiring of CL), the wiring length of the temperature switch can be shortened and the low power wiring structure can be provided to facilitate the wiring work of the product and increase the productivity of the product.

In addition, the above-mentioned temperature switch is connected in parallel with the tray motor GM mounted on the bottom of the microwave oven, and the temperature switch is installed on the bottom of the microwave oven close to the tray motor GM, and the wiring of the temperature switch As the low power wiring used for the tray motor GM is made, the wiring length of the temperature switch can be shortened, thereby reducing the unit cost of the product and increasing the productivity of the product by facilitating the wiring of the product. .

While the invention has been shown and described with respect to specific preferred embodiments thereof, the invention is not limited to the embodiments described above, and is commonly used in the art to which the invention pertains without departing from the spirit of the invention as claimed in the claims. Anyone with knowledge will be able to make various variations.

Claims (5)

In the wiring structure of the microwave oven having a temperature switch for controlling the power supply cut off according to the cooking chamber temperature of the microwave oven, The temperature switch is mounted on the upper surface of the cavity of the microwave oven, and is connected in parallel with the cavity lamp CL to induce an overcurrent by shorting both ends of the cavity lamp when the temperature is overheated to disconnect the fuse. Microwave wiring structure. delete In the wiring structure of the microwave oven having a temperature switch for controlling the power supply cut off according to the cooking chamber temperature of the microwave oven, The temperature switch is mounted on the bottom surface of the cavity of the microwave oven, and is connected in parallel with a tray motor (GM) to induce an overcurrent by shorting both ends of the tray motor when the temperature is overheated to cut the fuse. Wiring structure. delete The wiring structure of a microwave oven according to claim 1 or 3, wherein the temperature switch is a thermostat, and the thermostat is a normal open type.

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