KR20070008815A - Apparatus for processing input signal of (a) micro wave oven range - Google Patents

Abstract

An input signal processing apparatus for a microwave oven is provided to reduce costs by reducing the number of input ports of a micro computer. An input signal processing apparatus comprises a switching unit(200) constituted by a plurality of switches which are turned on/off by the command selected by a user; a signal processing unit for grouping switches of the switching unit such that different signals are output; and a micro computer(100) for taking, as an input, the signal output from the signal processing unit through a plurality of ports thereof, and outputting a control signal in accordance with the command. The signal processing unit includes a first signal processing section(300) for dividing switches into a plurality of groups, and outputting different signals in accordance with turn on/off of switches constituting a first group; and a second signal processing section(400) which is connected to switches excluding switches connected to the first signal processing section, and outputs different signals in accordance with turn on/off of switches constituting a second group.

Description

Apparatus for processing input signal of (a) micro wave oven range}

1 is a circuit diagram showing an input signal processing apparatus of a microwave oven according to the prior art.

2 is a circuit diagram showing an input signal processing apparatus of a microwave oven according to the present invention;

<Description of the symbols for the main parts of the drawings>

100: microcomputer 200: switching unit

300: first signal processor 400: second signal processor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven, and more particularly, to an input signal processing apparatus for a microwave oven, which enables a simpler process of a key input signal for selecting various menus of a microwave oven.

2. Description of the Related Art In general, a microwave oven is a cooking apparatus that drives a heater or a magnetron using electricity and cooks microwaves or heat. In particular, microwave ovens are easily used in a very short time, and thus are widely used in homes, businesses, and convenience stores.

In addition, in recent years, the number of people using microwave ovens is rapidly increasing, so that many households have microwave ovens, and the range of cooking ranges available in microwave ovens is expected to increase, and the use of microwave ovens is expected to continue to increase.

Thus, the cost of manufacturing the product is accompanied by the utilization of the microwave oven and the use population. Many products are available and feature diversified, but the most important part of consumers will be manufacturing cost and supply cost.

If the manufacturing cost of the product is high due to expensive materials and various other reasons, the demand population will have to be small. Compared to the function of the product, the manufacturer wants to produce a low-cost product with more functions. It must be the greatest wish. In this regard, the form or new proposal that can lower the manufacturing cost of the microwave oven can be very important from many aspects of the product.

One reason to increase manufacturing costs in addition to internal components in a microwave oven is to have multiple keys for selecting various menus. For example, a key for automatic cooking, manual cooking, other thawing and warming should be provided on a large category, and a key for selecting many cooking menus such as popcorn cooking, steaming, boiling, thawing, etc., on the medium category of the automatic cooking. Shall be. Many of these keys are configured to generate a signal for each cooking.

Hereinafter, an input signal processing circuit of a microwave oven according to the prior art will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram showing an input signal processing circuit of a microwave oven according to the prior art.

The input signal processing circuit of the microwave oven according to the related art has a switching unit 20 for switching according to a user's menu selection, and a microcomputer that receives a signal of the switching unit 20 and outputs a control signal to perform a corresponding operation. It consists of (10).

The switching unit 20 is a kind of dial key or menu selection key provided in a microwave oven, and is switched as the dial is rotated or a key is input to transmit a signal to the microcomputer 10.

In this case, the switching unit 20 is composed of a first switch (SW1) to the twelfth switch (SW12), the on / off switching of the first to twelfth switches (SW1 ~ SW12) configured in the switching unit 20 By operation, as the microcomputer 10 is connected to the first to twelfth ports P1 to P12 of the microcomputer 10, the microcomputer 10 determines what command the user selects and the microwave oven according to the corresponding menu. Control to be driven.

That is, the first port P1 of the micom 10 is connected to the first switch SW1 of the switching unit 20, and the second port P2 of the micom 10 is provided. As the second switch SW2 of the switching unit 20 is connected, the third port P3 to the twelfth port P12 also switch to the third switching unit SW3 to twelfth switching of the switching unit 20. It is connected to the part SW12.

That is, when the first switch SW1 is on-switching, the on signal is input to the first port P1 of the microcomputer 10, and when the second switch SW2 is on-switching, the on-signal Is input to the second port P2 of the microcomputer 10.

According to the cooking function input by the user as described above, the microcomputer 10 is assigned to the port by the on / off operation of each of the first to second switches SW1 to SW2 configured in the switching unit 20. It grasps the input signal and controls to perform the corresponding operation.

However, in selecting an operation function of the microwave oven according to the related art, in order to recognize a signal corresponding to each operation function, a port provided in the microcomputer 10 is connected to each of the switches provided in the switching unit 20. Consists of.

Therefore, since one port must be configured in one switch, the number of ports provided in the microcomputer 10 is relatively increased, so that the number of ports provided in the microcomputer 10 is relatively increased, and as a result, the expensive microcomputer 10 It was necessary.

Therefore, as the manufacturing cost increases, there is a problem such that the internal circuit becomes complicated to add various keys.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to enable a microcomputer to recognize a key signal input by a user with a small number of ports.

In addition, there is another purpose that the number of ports of the microcomputer does not increase at the same time even if the switch increases.

The input signal processing apparatus of the microwave oven according to the present invention for achieving the above object is a switching unit consisting of a plurality of switches that are turned on / off according to a command selected by the user, and different signals by grouping a plurality of switches of the switching unit And a microcomputer that receives a signal output from the signal processor and outputs a control signal according to a corresponding command.

Preferably, the switching unit is composed of first to Nth switches SW1 to SWN.

More preferably, the signal processor divides the first to Nth switches SW1 to SWN into a plurality of groups, and according to on / off of each of the switches SW1 to SW1 / 2N constituting the first group. The first signal processor for outputting different signals and the other switches SW3 / 2N to SWN except for a switch connected to the first signal processor among the first to Nth switches SW1 to SWN. A second signal processor outputs different signals according to on / off of each of the switches SW3 / 2N to SWN constituting the second group.

That is, the input signal processing apparatus of the microwave oven according to the present invention may be composed of a plurality of switches SW1 to SWN turned on / off according to a command to be selected by the user, and the user turns on / off the switches. You can choose the command you want.

That is, when a user wants to recognize the corresponding command in the microcomputer to turn on / off the plurality of switches SW1 to SWN, unlike the related art, the plurality of switches SW1 to SWN are grouped into a predetermined group. As the grouped switches are connected as one, the microcomputer may require only one or more reduced ports. That is, the number of ports applied to the microcomputer may be connected to one to N-1 as many as the number of switches.

EXAMPLE

Hereinafter, an example of using 12 switches in an input signal processing apparatus of a microwave oven according to the present invention will be described with reference to the accompanying drawings. In other words, it can be seen that when applied to the above description, N = 12.

2 is a circuit diagram showing an embodiment of an input signal processing apparatus of a microwave oven according to the present invention.

As shown in FIG. 2, the input signal processing apparatus of the microwave oven according to the present invention includes a switching unit 200 including a plurality of switches turned on / off according to a command selected by a user, and a plurality of the switching units 200. Signal processing unit (300) and 400 for processing different signals are output by grouping a plurality of switches, and the signal output from the signal processing unit 300 is respectively input to a plurality of ports to output a control signal according to the corresponding command It is composed of a microcomputer (100).

The switching unit 200 includes first to twelfth switches SW1 to SW2, and the signal processing unit includes first to sixth switches SW1 to SW6 of the first to twelfth switches SW1 to SW12. A first signal processing unit 300 connected to the first signal processing unit 300 to output different signals according to switching on of the first to sixth switches SW1 to SW6, and a seventh of the first to twelfth switches SW1 to SW12. The second signal processor 400 is connected to the twelfth switches SW7 to SW12 to output different signals according to the switching on of the seventh to twelfth switches SW7 to SW12.

In addition, the first signal processor 300 may include first to sixth resistors R300 to R305 having one end connected to the first to sixth switches SW1 to SW6 and the other end connected to one contact point. A thirteenth resistor R101 having one end connected to the contact and the other end being grounded, a fourteenth resistor R103 having one end connected to the thirteenth resistor R101, and one end connected to the fourteenth resistor R103 The other end is connected to the first capacitor (C95) is grounded.

The second signal processor 400 includes seventh to twelfth resistors R306 to R311 having one end connected to the seventh to twelfth switches SW7 to SW12 and the other end connected to one contact point. A fifteenth resistor R102 having one end connected to the contact and the other end grounded, a sixteenth resistor R104 having one end connected to the fifteenth resistor R102, and one end to the fourteenth resistor R104. The other end is connected to the first capacitor (C96) is grounded.

Accordingly, the microcomputer 100 may recognize that only a plurality of first and second ports P11 and P12 are required to receive the processing signals of the first signal processor 300 and the second signal processor 400. have.

The operation of the input signal processing apparatus of the microwave oven according to the present invention configured as described above is as follows.

According to the switching operation of the first to twelfth switches SW1 to SW12 of the switching unit 200, a voltage value recognized by the micom 100 is input differently, and the micom 100 is connected to the first port P11. ) Or determine the voltage value input to the second port (P12), and outputs the corresponding control signal according to the command input by the user.

For example, when all of the first to twelfth switches SW1 to SW12 are in an off state, voltage values are provided at the first port P11 and the second port P12 provided in the microcomputer 100. In this case, the microcomputer 100 recognizes the input voltage value as '0' and determines that the user has not selected any key.

In addition, when only the first switch SW1 is switched on and the remaining second to twelfth switches S2 to S12 are in an off state, the first resistor R300 and the thirteenth resistor ( The voltage dividing resistance value with R101 is input to the fourteenth resistor R103, and as a result, a corresponding voltage is applied to the first port P11 of the microcomputer 100, and thus the microcomputer 100 receives the input voltage. It outputs a control command corresponding to the value to control the operation.

Similarly, when only the seventh switch SW7 is switched on and the remaining first to twelfth switches SW1 to S12 are in an off state, the seventh resistor R306 and the fifteenth resistor. The voltage dividing resistance value with the R102 is input to the sixteenth resistor R104, and as a result, a corresponding voltage is applied to the second port P12 of the microcomputer 100. The control operation is performed by outputting a control command corresponding to the voltage value.

Therefore, the microcomputer 100 has only a voltage value input through the first port P11 or the second port P12 and any one of the first to twelfth switches SW1 to SW12 of the switching unit 200. The switch can determine whether a signal is input, and accordingly controls the operation to be performed.

As described above, the input signal processing apparatus of the microwave oven according to the present invention has the following effects.

First, the cost of selecting a microcomputer can be reduced by reducing the number of input ports provided in the microcomputer.

Second, as the cost of microcomputer selection is reduced, manufacturing costs required to manufacture a product can be reduced.

Third, since the product can be supplied at a low cost while implementing the same performance as in the related art, user satisfaction with the product can be improved.

Claims (3)

A switching unit including a plurality of switches turned on / off according to a user-selected command; A signal processing unit for processing a group of a plurality of switches of the switching unit to output different signals; And, And a microcomputer for receiving a signal output from the signal processor through a plurality of ports and outputting a control signal according to a corresponding command. The method of claim 1, And said switching unit comprises first to Nth switches (SW1 to SWN). The signal processor The first to Nth switches SW1 to SWN are divided into a plurality of groups, and the first to Nth switches SW1 to SWN output different signals according to the on / off of each of the switches SW1 to SW1 / 2N. 1 signal processing unit, Each of the switches SW3 / which are connected to the switches SW3 / 2N to SWN except for the switch connected to the first signal processing unit among the first to Nth switches SW1 to SWN to form the second group. And a second signal processor for outputting different signals according to the on / off of 2N to SWN.

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