KR20040003384A - Key input circuit in microwave oven having radio - Google Patents

Abstract

PURPOSE: A key input circuit of a radio microwave oven is provided to consult an user's convenience by adding a radio receiving function to a microwave oven. CONSTITUTION: A key input circuit of a radio microwave oven includes a signal input portion(5), a display portion(1), a radio module, an EEPROM(6), and a micro computer(7). The signal input portion(5) receives a radio operating signal. The display portion(1) displays an operating state of a radio according to the radio operating signal of the signal input portion(5). The radio module is used for receiving a signal of a channel selected by a user and outputting the received signal. The EEPROM(6) is used for storing the selected radio channel. The micro computer(7) is used for controlling an operation of the radio module according to the radio operating signal and a displaying operation of the display portion(1).

Description

Key input circuit in microwave oven having radio

The present invention relates to a radio microwave oven, and more particularly, to a key input circuit of a radio microwave oven, which improves the convenience of use in a microwave oven to which a radio function is added.

A microwave oven is a cooking apparatus that can cook quickly and simply using microwave waves and heater heat. With the recent development of technology, the use capacity and control function of the electric devices provided in the microwave have also gradually increased. In addition to this, as the frequency of use of microwave ovens increases, consumers are demanding that microwaves be used not only for cooking but also for cooking.

However, the conventional microwave oven is simply composed of a cooking device for cooking.

As shown in FIG. 1, the conventional microwave oven includes a driving unit 120 including a magnetron and a heater for generating heat or microwave waves for cooking, and a control unit 110 for controlling the driving unit 120. A signal input unit 100 for selecting or inputting a cooking mode, a display unit 130 for displaying a current cooking state and a state input by the user, a voice output unit 140 for outputting a warning signal, etc. Is done.

The microwave oven having the above configuration simply consists of a component for selecting a dish to be controlled, controlling the dish, and performing the dish. Therefore, the structure for functions other than cooking is not provided and it does not have a function. For this reason, microwaves could only be used as cooking equipment for cooking, but not in other parts.

This conventional microwave oven configuration has the following problems.

First, it did not have multimedia functions according to the current trend of globalization. In other words, the conventional microwave oven could only be used for cooking, but not otherwise. This has become a factor due to the dissatisfaction of consumers who demand multiplexing.

Secondly, various electrical components used in microwave ovens due to the recent development of technology have high performances with large capacities and fast processing speeds. Nevertheless, simply using the microwave oven as a cooking device for cooking, the utilization of the various electrical components provided in the product was low. This is a problem that does not have a product function in proportion to high performance and expensive manufacturing cost.

Accordingly, an object of the present invention is to provide a key input circuit of a radio microwave oven, which is easy to use in a radio microwave oven capable of listening to a radio signal by adding a simple component.

1 is a block diagram of a conventional microwave oven,

2 is a block diagram of a radio microwave oven according to the present invention;

3 is an exemplary view of a signal input unit and a display device in a radio microwave oven according to the present invention;

4, 5, 6, and 7 are operational flowcharts for simplifying radio channel selection in a radio microwave oven according to the present invention.

Explanation of symbols on the main parts of the drawings

1: Display device 2: Relay drive unit

3: dial input circuit 4: power supply circuit

5: key input circuit 7: microcomputer

9: reference frequency oscillator 11: phase comparator

13: frequency divider 15: universal counter

17: low pass filter 19: voltage regulator

21 Antenna 23 Mixer

25: intermediate frequency circuit 27: multiplexer circuit

29 Speaker 6: EEPROM

A key input circuit of a radio microwave oven according to the present invention for achieving the above object comprises: a signal input unit for inputting a radio operation signal in a microwave oven having a cooking control function; A display device displaying a radio operation state according to a radio operation signal of the signal input unit; A radio module for receiving and outputting a signal of a radio channel selected by a user; An EEPROM for storing a radio channel tuned in the radio module; And a microcomputer controlling the operation of the radio module by the radio operation signal of the signal input unit and controlling the display of the radio channel on the display device based on the radio channel stored in the EEPROM.

The EEPROM stores frequency counts of radio channels tuned to by the radio module, and the microcomputer controls radio channel display of the display device in order of frequency of use among frequencies stored in the EEPROM. .

The microcomputer controls the display device to display the frequency with the highest frequency of use among the frequencies stored in the EEPROM at the same time as the radio function is selected.

The signal input unit, the display device, the EEPROM, and the microcomputer are used in common when performing cooking control of a microwave oven.

The microcomputer is characterized by controlling not to use the radio function and cooking function at the same time.

Hereinafter, a key input circuit of a radio microwave oven according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a control block diagram of a radio microwave oven according to the present invention.

First, a radio microwave oven according to an embodiment of the present invention includes a radio module for controlling a radio function and a module for driving the microwave oven. The radio module is configured to be controlled by a driving module of the microwave oven. The radio module uses a chipped radio receiver 30 and a chipped PPL circuit 20. The radio module further includes a voltage adjusting unit and a low pass filter.

The driving module 10 of the microwave oven includes a relay driver 2 for driving a magnetron, a heater, a fan motor, and the like, and a microcomputer for controlling the relay driver 2 when cooking in a microwave oven. (7), a dial input circuit (3) and a key input circuit (5), which are signal input sections for inputting a user selection signal, and a display device (1) for displaying a current operating state of a microwave oven, a signal input by a user, and the like. It includes. And a power supply circuit 4 for supplying power to the microcomputer 7.

The dial input circuit 3 changes the input signal in accordance with the amount of rotation of the dial, and is generally used for input of menus, time and temperature according to automatic cooking. The key input circuit 5 selects various key signals provided in the outer case of the microwave oven and transmits a code corresponding to the selected signal to the microcomputer 7.

The dial input circuit 3 and the key input circuit 5 are also used to input a channel tuning signal or the like according to the radio function performance. Therefore, the dial input circuit 3 and the key input circuit 5 should include a key signal or menu for radio channel selection.

3 shows various key buttons provided in the microwave oven of the present invention. Volume key 212 for adjusting the volume, tuning key 212 for adjusting the frequency, band 204 and the like, memory key 208 for storing the frequency to be described later, and preset Key 206, on / off key 202 for listening to radio, and the like. Reference numeral 1 denotes a display device. In addition, a variety of key buttons are provided for cooking in the microwave.

In the present invention, the microwave driving module 10 includes an EEPROM 6. The EEPROM 6 stores frequencies according to radio channels set by a user. Accordingly, the user can perform channel selection simply by selecting a frequency stored in the EEPROM 6 at the time of radio channel selection. The EEPROM 6 can also be used to store various control programs according to automatic cooking in the cooking function of the microwave oven.

The relay driver 2 includes a magnetron that generates heat or microwave waves required when cooking in a microwave oven, and relays that open and close the power supply to the heater. It also includes a relay to open and close the power supply to the fan motor to circulate the cooling function and heater heat into the refrigerator.

In addition, the microcomputer 7 performs a function of controlling cooking of the microwave oven. Therefore, it stores the control algorithm necessary for cooking control. In particular, the control algorithm for each cooking menu is stored according to the control process, operating temperature, operating time, and so on.

In the microwave oven of the present invention, the microcomputer 7 is also used to control the radio function. That is, the microcomputer 7 recognizes the broadcast channel (frequency) currently received by the radio receiver 30, which will be described later, and checks whether it matches the broadcast channel selected by the user. The microcomputer 7 also controls the tuning operation according to the broadcast channel selected by the user through the PPL circuit described later. Therefore, the microcomputer 7 must have a control algorithm required for radio function control.

In the present invention, the display device 1 displays a cooking progress state, a selected cooking mode, and the like while the function of the microwave oven is being performed. However, during the execution of the radio function, the frequency input according to channel selection during the execution of the radio function is displayed, such as the current input frequency and the final determined frequency according to the tuning operation.

Next, the radio module includes a chipped PPL circuit 20 and a chipped radio receiver 30, and is not included in the PPL circuit 20, but is configured to form a PLL circuit like the PPL circuit 20. The adjusting unit 19 and the low pass filter 17 are provided.

The PPL circuit 20 is composed of one chip and is connected to a serial port of the microcomputer 7. This is because the elements in the PPL circuit 20 are implemented in a serial manner, so the data input to the PPL circuit 20 should be serial data. Thus, the microcomputer 7 connects the PPL circuit 20 to an internal serial port.

The PPL circuit 20 receives a signal from the microcomputer 7 by assisting the PLL circuit and performs a reception frequency tuning operation so that a channel selected by a user can be tuned. To this end, the PPL circuit 20 includes a reference frequency oscillator 9 for generating a reference frequency for the tuning operation under the control of the microcomputer 7 and an input frequency under the control of the microcomputer 7. And a phase comparator 11 for comparing the phase of the frequency divided by the frequency divider 13 and the reference frequency generated by the reference frequency oscillator 9. The PPL circuit 20 includes a universal counter 15. The universal counter 15 counts the intermediate frequency signal output from the intermediate frequency circuit 25 and outputs the result to the microcomputer 7. The microcomputer 7 causes the display device 1 to display the output signal of the universal counter 15.

And a low pass filter (17) for forming a PLL circuit together with the PPL circuit (20), the low pass filter (17) outputting a DC voltage with respect to the phase comparison deviation in the phase comparator (11), and the low pass filter (17). A voltage adjusting unit 19 for outputting an oscillation frequency in accordance with the voltage output from is provided.

Next, the radio receiver 30 includes an intermediate frequency circuit 25 for extracting an intermediate frequency signal from an input signal, and a multiplexer circuit 27 for adjusting stereo sound from a received signal passing through the intermediate frequency circuit 25. It is configured to include. The output signals of the intermediate frequency circuit 25 and the multiplexer circuit 27 are also input to the microcomputer 7.

In addition, in the present invention, the mixer 23 for mixing the voltage signal output from the voltage adjusting unit 19 and the reception frequency of the antenna 21 and transmitting it to the radio receiver 30, and the output of the radio receiver 30 The speaker 29 which outputs these audible signals is included.

From the above configuration, the microcomputer 7 inside the microwave driving module 10 is connected to the divider 13 and the reference frequency oscillator 9 in the PPL circuit 20 through an internal serial port. . The microcomputer 7 is connected to the universal counter 15 in order to input the output signal of the universal counter 15 in the PPL circuit 20. In addition, the microcomputer 7 is connected to the output terminal of the intermediate frequency circuit 25 inside the radio receiver 30, and is also connected to the output terminal of the multiplexer circuit 27.

Next will be described the operation of the radio microwave oven according to the present invention having the above configuration.

First, the operation process for cooking in the microwave will be described.

When power is input into the product, it is supplied to the microcomputer 7 through the power supply circuit 4. The power supplied from the power supply circuit 4 is shared and used for both the radio module and the microwave driving module.

In the state where power is supplied inside the product, the user selects the cooking mode via the dial input circuit 3 or the key input circuit 5. The selected cooking mode is input to the microcomputer 7. The microcomputer 7 controls the selected cooking to be performed.

That is, when the selected dish is an automatic dish, after recognizing a predetermined control algorithm corresponding to the selected cooking mode, a signal is output to the relay driver 2 to drive a corresponding driving device (eg, a magnetron or a heater). do. The microcomputer 7 causes the display device 1 to display the cooking state currently in progress.

In addition, when the selected dish is a manual dish, the display device 1 displays a value corresponding to a signal input by the user. Then, the driving device required to perform the selected manual cooking is driven. After the cooking is started, the display device 1 displays data according to the cooking state.

The control according to the cooking operation of the microwave oven is the same as the general control operation.

Next, look at the operation of the radio function in the microwave oven.

In a state where power is supplied to the product through the power supply circuit 4, when a user wants to perform a radio function in a microwave oven, the user receives the signal using the dial input circuit 3 or the key input circuit 5. Enter the radio channel you want. The input radio channel is transmitted to the microcomputer 7, and by the signal, the microcomputer 7 recognizes a radio channel that the user requests to perform a radio function and the user wants to receive.

Upon recognizing the radio channel according to the reception request by the above operation, the microcomputer 7 outputs a control signal for listening to the radio to the PPL circuit 20. That is, the microcomputer 7 outputs, to the divider 13, PPL data capable of producing the center frequency of the radio channel selected in the initial state. The microcomputer 7 also outputs an operation signal to the reference frequency oscillator 9.

In this operation, the frequency divider 13 divides the input frequency and outputs it to the phase comparator 11, and the reference frequency oscillator 9 generates a reference frequency and outputs it to the phase comparator 11. The phase comparator 11 receives a frequency divided by the frequency divider 13 and a reference frequency output from the reference frequency oscillator 9 and compares the phases of the two frequencies.

If the phases compared in the phase comparator 11 are different, the low pass filter 17 filters them to different DC voltages, and outputs them to the voltage adjusting unit 19. The voltage adjusting unit 19 mixes the oscillation frequency fo according to the DC voltage output from the low pass filter 17, that is, the oscillation frequency fo determined by the tuning data of the microcomputer 17. )

On the other hand, the mixer 23 mixes the radio signal received through the antenna 21 and the oscillation frequency fo, and outputs the intermediate frequency IF obtained at this time to the radio receiver 30. The intermediate frequency circuit 25 in the radio receiver 30 amplifies and outputs only a signal of a desired band from the received reception signal.

The signal output from the intermediate frequency circuit 25 is input to the universal counter 15, and the universal counter 15 digitizes the input signal and transmits it to the microcomputer 7. The microcomputer 7 causes the display device 1 to display the output signal of the universal counter 15. Therefore, the user can check the frequency of the channel selected by the signal displayed on the display device 1 in the above process.

In addition, the intermediate frequency signal SD output from the intermediate frequency circuit 25 is directly input to the microcomputer 7. At this time, by the input signal, the microcomputer 7 confirms whether the channel matches the frequency of the channel selected by the user. If the frequency of the channel selected by the user and the signal SD directly input from the intermediate frequency circuit 25 are different, the tuning operation through the PPL circuit 20 is repeatedly performed to match the two signals.

The microcomputer 7 directly inputs the signal ST output from the multiplexer circuit 27. Then, a process of comparing the signals input from the intermediate frequency circuit 25 and reconfirming whether the two signals are identical is performed.

When the tuning of the radio channel is completed by the above process, the display device 1 finally displays the user-selected radio channel frequency counted by the universal counter 15. The signal output from the intermediate frequency circuit 25 becomes a signal according to a radio channel selected by a user. Therefore, the multiplexer circuit 27 adjusts stereo sound from the output signal of the intermediate frequency circuit 25 and outputs it through the speaker 29.

Next, a process of facilitating the use of key input in the radio microwave oven according to the present invention will be described.

4 is a flowchart illustrating an operation according to a process for storing a radio frequency in an EEPROM according to the present invention.

In the present invention, there is provided an EEPROM (6) for storing the tuned frequency for use in future use. The EEPROM 6 is controlled by the microcomputer 7, and stores the tuned frequency.

That is, when the user wants to listen to the radio, the user selects the radio on / off button 202 (step 300). The button 202 selection signal is input to the microcomputer 7. The microcomputer 7 recognizes that the user has selected the radio function by the signal.

Then, the microcomputer 7 inputs the frequency tuned by the user via the tuning key 210 (step 310). When the user selects the memory key 208 after the final tuning is completed (step 320 and step 330), the microcomputer 7 stores the tuned frequency in the EEPROM 6 (step 340). At this time, the microcomputer 7 assigns a frequency stored in the EEPROM 6 to a preset function. This is to read the frequency stored in the EEPROM 6 when the preset key 206 is selected next. This operation allows the user to store a plurality of frequencies in the EEPROM 6 according to the preset function of the microcomputer 7.

Next, a process of controlling radio reception using the frequency stored in the EEPROM 6 will be described with reference to FIG. 5.

When a user wants to listen to a radio using a microwave oven, the user first selects a radio on key 202. The user then selects preset key 206 (step 400).

The microcomputer 7 recognizes that when the preset key 206 is selected in step 400, the user performs radio channel selection using the frequency stored in the EEPROM 6. Therefore, the microcomputer 7 reads the stored radio frequency from the EEPROM 6 (step 410).

Whenever the user selects the preset key 206 once, the microcomputer 7 sequentially displays the plurality of frequencies stored in the EEPROM 6 on the display device 1 (step 420).

In addition, in the present invention, when the user selects the radio function, it is also possible to control the frequency to be displayed on the display device 1 in the order of the frequently used frequencies.

In order to control the operation, the microcomputer 7 stores the number of frequencies used in a predetermined portion of the EEPROM 6, and when the preset key 206 is selected, the order in which the number of frequencies used is high. As such, the display device 1 controls the frequency display.

That is, as shown in FIG. 6, when the user selects a radio function (step 500) and tunes a radio channel frequency to receive (step 510), the microcomputer 7 selects the EEPROM. The control for storing the frequency of use of the frequency tuned to the predetermined portion of step (6) is performed (step 520). The process shown in FIG. 6 is a process for checking and storing the frequency of use of the used frequency.

When the frequency of use of the frequency used in this operation is stored, when displaying the frequency stored in the EEPROM in step 420, it is possible to control the display to be performed in the order of the frequency used.

In addition, according to the present invention, it is also possible to control the radio frequency, which has been used the most, at the same time as the radio on key 202 is displayed on the display device 1. The procedure at this time is shown in FIG.

To control the operation, the microcomputer 7 uses the frequency of use of the used frequency according to the process of FIG. And if the radio on key 202 is selected, and if the radio on key 202 is selected (step 600), the number of frequencies used is based on the frequency of use stored in the EEPROM according to the process of FIG. Many frequencies are read from the EEPROM (step 610). The display apparatus 1 is controlled to be displayed on the display device 1 (operation 620).

In the embodiment of the present invention, it is preferable that the operation of the radio module is not performed while the cooking mode of the microwave oven is operating. This is the magnetron, which is the driving device of the microwave, oscillates microwave waves to perform cooking. Therefore, when the radio module is operated during the cooking operation, the radio reception is difficult due to the high frequency noise generated in the magnetron.

Therefore, when the radio function related key is selected while the microwave is in use, it is preferable to display an error on the display unit 1 or to control an alarm sound according to the occurrence of the error. On the contrary, even while the radio function is being performed, if a button for cooking control of the microwave oven is input, it is preferable to control so as to output a message or an alarm sound to stop the radio function first.

As described above, the key input device of the radio microwave oven according to the present invention stores the radio channel frequency tuned in the microwave oven equipped with the radio listening function in the EEPROM. Whenever the preset key is selected, the channel frequency stored in the EEPROM is sequentially displayed on the display device, thereby simplifying the selection of the radio channel frequency. In addition, the present invention is characterized in that the radio channel used by the user is controlled to be displayed on the display device with the highest priority or radio on operation.

The present invention described above can obtain the following effects.

First, since the present invention is provided with a radio listening function in addition to the cooking function in the microwave, it is possible to listen to the radio using a microwave oven. Therefore, it is possible to provide an economic advantage to consumers by eliminating the expense of purchasing a separate radio product.

Secondly, the present invention uses various electric elements provided in the microwave in common for cooking function control and radio function control. Therefore, it is possible to obtain the effect of increasing the utilization of the electrical devices provided in the product.

Third, the present invention provides one or more functions using one electronic device. Therefore, while providing a microwave oven to the consumer, it is possible to increase the satisfaction with the product.

Fourth, the present invention simplifies radio channel selection by storing frequencies used to simplify the selection of radio channel frequencies and controlling the display of stored frequencies by simple key selection.

Claims (5)

In a microwave oven with a cooking control function, A signal input unit for inputting a radio operation signal; A display device displaying a radio operation state according to a radio operation signal of the signal input unit; A radio module for receiving and outputting a signal of a radio channel selected by a user; An EEPROM for storing a radio channel tuned in the radio module; A key input circuit of a radio microwave oven including a microcomputer controlling an operation of the radio module by a radio operation signal of the signal input unit and controlling radio channel display on a display device based on a radio channel stored in the EEPROM. . The method of claim 1, The EEPROM stores frequency counts of radio channels tuned in the radio module. And the microcomputer controls radio channel display of the display device in order of frequency of use among frequencies stored in the EEPROM. The method of claim 2, And the microcomputer controls the radio microwave so as to display the frequency with the highest frequency of use among the frequencies stored in the EEPROM at the same time as the radio function is selected. The method according to any one of claims 1 to 3, And the signal input unit, the display device, the EEPROM, and the microcomputer are used in common when performing cooking control of the microwave oven. The method of claim 4, wherein And the microcomputer controls the radio function and the cooking function so as not to be used at the same time.