KR940004811Y1 - Conclude signal apparatus of microwave oven - Google Patents

Abstract

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Description

Operation end signal device of microwave oven

1 is a block diagram of a general microwave oven.

2 is an operating state circuit diagram of a conventional microwave oven in FIG.

3 is an operating state circuit diagram of the inventive microwave oven as shown in FIG.

4 is a signal flow diagram illustrating the operation of the present invention.

* Explanation of symbols for main parts of the drawings

1: Printed Circuit Board (PCB) Sub Assembly

2: first relay 3: second relay

4: low voltage transformer 5: oven lamp

6: fan motor 7: turntable motor

8: primary switch 9: monitor switch

10: secondary switch 11: high voltage transformer

12: magnetron 13: the third relay

The present invention relates to an operation end signal device of a microwave oven, and in particular, by periodically turning on / off a lamp to visually inform the end state of cooking so that it is suitable for preventing the user from leaving the cooked food in the microwave. It relates to an operation end signal device of a microwave oven.

In general, the microwave oven is composed of the first and second relays (2), (3) and the low voltage transformer (4) as shown in FIG. 1 through the primary and secondary switches (8) and (10). Printed circuit board sub-assembly (1) for detecting the opening and closing of the door of the microwave oven, and the monitor circuit is opened by the second relay (3) receives the power from the primary switch (8) The monitor switch 9 which prevents the fuse F from melting during normal operation, and the oven lamp 5 which is connected in parallel to operate simultaneously with the driving of the first relay 2 to illuminate the inside of the product and rotate Fan motor 6 to cool the heat of the magnetron 6, turntable motor 7 for heating food evenly, and the magnetron 12 by supplying power to the oscillation according to the operation of the second relay (3) The main body is composed of a high-voltage transformer (11). Yes torch and oven and thermostat (H · V · C · V · D and H) is a high-voltage capacitor and a diode. And (P · J and J · S) are probe jacks and jack switches.

In the microwave oven configured as described above, when the door of the microwave oven is closed in the operating state circuit diagram shown in FIG. 2, the contact of the primary switch 8 is pressed by a mechanical mechanism, and the circuit is connected to one side of the high voltage transformer 11. Power is supplied to the terminals.

In addition, since the contact of the secondary switch 10 is pressed, the printed circuit board subassembly 1 detects that the door of the microwave oven is closed, and when the contact of the monitor switch 9 is pressed, the circuit is opened to open the monitor circuit. Is opened to prevent the fuse (F) from melting during normal operation.

At this time, when the start key is pressed to operate the system, the first relay 2 is driven to operate the oven lamp 5, the fan motor 6, and the turntable motor 7, and the second relay 3 is driven. The magnetron 12 oscillates by supplying power to the high voltage transformer 11.

That is, the oven lamp 5 is turned on to illuminate the inside of the product, and the magnetron 12 is cooled by the wind from which the fan motor 6 rotates, and this wind draws out the steam inside the product, and the turntable motor 7 Rotation of) heats food in the heating chamber evenly.

Thus, the oven lamp (5), fan motor (6), turntable motor (7) is driven by the first relay (2) during the set operation, and when the door of the microwave oven is returned to the circuit state of FIG. The first relay 2 is cut off to stop the operation of the oven lamp 5, the fan motor 6, and the turntable motor 7, and the second relay 3 is cut off to be supplied to the high voltage transformer 11. Cut off the power.

In addition, when the set time ends, the first and second relays 2 and 3 are cut off, and the oven lamp 5, the fan motor 6, and the turntable motor 7 stop operation and the high voltage transformer 11 is stopped. ) Also stops supplying power.

However, in the conventional microwave oven, when the time expires, the first relay is cut off, and the operation of the oven lamp, the fan motor, and the turntable motor driven by the first relay is stopped.

At this time, consumers who use the microwave often do different things when cooking food in the microwave, so if you do not watch when the set time is over, you will not know the cooking is over and leave the cooked food in the microwave. In many cases, the cooked food will cool.

Therefore, in order to reheat it, the microwave oven must be reactivated, and thus, the taste of food is lowered and the discomfort and energy loss caused by the reoperation are reduced.

In addition, in order not to do this, the consumer of the microwave oven has to keep watching when cooking food, so there is a problem in that other things cannot be done in parallel when using the microwave oven.

The present invention adds a third relay in consideration of such a conventional problem, and periodically turns on or off the lamp according to the operation of the relay to visually inform the end of cooking, so that the user can cook the finished food in the microwave. An operation end signal device for a microwave oven which can be prevented from being left unattended, which will be described below with reference to the accompanying drawings.

3 is an operating state circuit diagram of the present invention as shown in FIG. 1, which is composed of first and second relays 2, 3, and a low voltage transformer 4, and a primary and secondary switch 8 as shown in FIG. , The printed circuit board sub-assembly (1) detecting the opening and closing of the microwave oven door through (10), and the monitor circuit is opened by the second relay (3) to apply power from the primary switch (8). And a power supply to the magnetron 12 by the primary switch 8 and the second relay 3 and the monitor switch 9 for preventing the fuse F from melting during normal operation. A high-pressure transformer 11 for oscillating and heating food in a microwave oven, a fan motor 6 for cooling the magnetron 6 by rotating by the first relay 2, and the fan motor 6 Turntable motor (7) connected in parallel with and driven to uniformly heat food in the microwave In the microwave oven consisting of an open lamp (5) that illuminates the inside of the product, by connecting the primary switch (8) and the oven lamp (5) one side terminal to drive the oven lamp (5) on / off periodically It comprises a third relay 13 for lamp control to visually inform the end of cooking, and the descriptions of the drawings (M · T), (O · T), (H · V · C), (H · V · D), (P · J) and (J · S) are magnetron and oven thermostats, high voltage capacitors, diodes, probe jacks and jack switches.

The operation and effects of the present invention constructed as described above will be described with reference to FIG. 3 and FIG.

First, when the set is operated in the operating state circuit diagram of the present invention shown in FIG. 3, the magnetron 12 is oscillated by supplying power to the high voltage transformer 11 by the primary switch 8 and the second relay 3. The food in the microwave is heated.

At this time, the fan motor 6 rotates to cool the magnetron 12. When the first relay 2 is driven, a circuit is connected and rotated by the first relay 2, and at the same time, the fan motor 6 In turn, the turntable motor 7 connected in parallel also rotates. Here, the driving of the first and second relays 2 and 3 is performed when the printed circuit board subassembly 1 is detected as closed by the ON of the secondary switch 10 and the oven door is closed. Since one terminal of the lamp 5 is independently connected to the third relay 13, the oven lamp 5 is turned on by the driving of the third relay 13 during the set operation. When the operation is finished, the oven lamp 5 is periodically turned on / off by the control of the third lamp 13 for controlling the lamp to visually inform the user that the cooking is finished.

That is, as shown in the signal flow diagram shown in FIG. 4, if the completion flag is set, the periodic flag is set. Turn on the oven lamp 5 for 1 second by turning on the contact of the third relay 13 of the stage. Reset the cycle flag by executing the program.

after, By doing a loop of Turn off the contact of the third relay 13 of the stage to open the oven lamp (5) for 1 second, and then Run the program of step to set the cycle flag again Perform

In this way, the oven lamp 5 is turned on / off every two seconds until the door of the microwave oven is opened so that a consumer using the microwave can visually know the cooking state.

In addition, the operation is repeated periodically until the door of the microwave oven is opened, and when the door is opened, the oven switch 5 is automatically switched off because one terminal of the third relay 13 is cut off. Becomes off.

As described in detail above, in the prior art, there is no device for notifying that the cooking is finished when the operation of the microwave stops, but the user did not know that the cooking was finished unless the user watched the cooking progress. When it stops, the lamp is turned on / off at a predetermined cycle to visually indicate the finished state, so that other things can be done at the same time. It is possible to prevent the energy loss caused by.

Claims (2)

And a third relay for controlling the oven lamp, and a microcomputer (not shown) for periodically turning on / off the third relay to periodically turn on / off the oven lamp by interrupting the third relay. Operation end signal of microwave oven. The operation end signal device of the microwave oven according to claim 1, wherein the third relay is periodically turned on / off until the door switch is opened.