KR100577227B1 - Key input system - Google Patents

Abstract

The present invention relates to a key input system, and more particularly to a key input system that can easily detect the occurrence of a problem of the key input system itself. The key input system of the present invention is a key input system connected through a plurality of lines of a main board and a connector with a built-in microcomputer, and is composed of a plurality of switches in a matrix form, one end of each of the plurality of switches being the connector. Connect one of the plurality of output ports of the microcomputer through one of a plurality of lines of and the other end of each of the plurality of switches is connected to one of the plurality of input ports of the microcomputer through one of the plurality of lines of the connector And configuring at least one switch of the plurality of switches in a short state to determine whether there is a defect in a connector line to which the short switch is connected through signal input / output of the short state switch. Display the code, even if the motherboard is normal It may be mistaken as to obtain motherboard failure to prevent errors that exchange expensive motherboard.

Keystroke system

Description

Key input system

1 is a block diagram illustrating a connection between a key input system and a main board according to the prior art;

FIG. 2 is a circuit diagram illustrating a connection state between a key input system and a main board illustrated in FIG. 1.

3 is a circuit diagram illustrating a connection state between a key input system and a main board according to the present invention;

* Description of the symbols for the main parts of the drawings *

30: motherboard 31: microcomputer

32: connector 40: key input unit

The present invention relates to a key input system, and more particularly to a key input system that can easily detect the occurrence of a problem between the key input system and the connector of the motherboard.

Oven range functions can be divided into three functions: oven function, roasting function and gas range. These functions are maintained at a high level in terms of function and safety due to the development of product technology. Some functions, such as roasting functions, have already reached a certain level due to the development of Korean oven range.

Recently, the trend of pursuing differentiated design and ease of use while maintaining the function of the oven range according to the consumer's taste is showing.

In addition to such microwave ovens, there are also microwave ovens that heat food by radio waves, often called microwave ovens.

Heaters and gases heat food outside, but in microwaves the entire food receives energy from radio waves and heats up uniformly.

In microwave or oven ranges, the key input system is mainly connected to the main PCB assembly with a microcomputer and a connector. When a user inputs a desired key through the key input system, The signal is passed through the connector to the main PCB assembly.

Hereinafter, a key input system in an oven range according to the prior art will be described with reference to the accompanying drawings.

1 is a block diagram illustrating a connection between a key input system and a main board according to the prior art, and FIG. 2 is a view for explaining a connection state between the key input system and the main board shown in FIG. 1.

The connection configuration between the key input system and the main board according to the prior art is shown in the case of an oven range, for example, the main PCB assembly in which the key input unit 20, which is a key input system, and the microcomputer 15 are built-in The connection structure with the abbreviation 10 is shown.

Here, the main board 10 interprets the control command of the connector 17 for connection to the key input unit 20 and the signal interface and the key input unit 20 transmitted through the connector 17, and then interprets the control command on the display unit 13. It is composed of a microcomputer 15 for displaying and controlling the oven range as a whole, and a power supply unit 11 for supplying power to the microcomputer 15.

At this time, the main board 10 is connected to the key input unit 20 through the connector 17. When a user inputs a desired key through the key input unit 20, a corresponding signal is input through the connector 17. It is transmitted to the microcomputer 15 of (10).

The detailed configuration of the key input unit 20 generally includes a plurality of input keys SW01, SW02, ..., SW20 as shown in the circuit diagram of FIG. 2, and the user input key SW01, SW02, ... If SW20 is selected, the key input signal generated from the input keys SW01, SW02, ..., SW20 is transmitted to the microcomputer 15.

At this time, the first to fourth ports port1 to port4 of the first to ninth ports port1 to port9 of the microcomputer 15 are output ports, and output arbitrary pulse waveforms sequentially and periodically at intervals from each other. do.

The fifth to ninth ports port5 to port9 are input ports of the microcomputer 15, and whether the pulses of the output ports port1 to port4 are input through the fifth to ninth ports port5 to port9. If input, it checks which port is inputted, and based on it, the microcomputer 15 determines whether the user inputs a key or which key is pressed if the key is input.

Also, if the user does not press any key, no signal is input through the fifth to ninth ports port5 to port9 which are input ports. In this case, referring to the example of FIG. 2, a voltage close to 5V is always input.

However, in FIG. 2, when the contact of the connector line 1 is unstable, the switches S / W04, S / W08, S / W12, S / W16 and S / W20 of the key input unit do not operate.

In addition, if the contact of line 8 of the connector is unstable, the switches S / W13, S / W14, S / W15 and S / W16 of the key input unit do not operate.

In this way, if the contact of any line of the connector 20 connecting the main board and the key input unit is unstable, the switches connected thereto do not work properly. However, it could be difficult for the user or repairman to determine the cause of the malfunctioning of the entire oven range.

In other words, if the connection status of the connector connecting the main board with the key input unit and the microcomputer is unstable, the signal from the key input unit may not be properly transmitted to the main board, and thus the user may not respond or do not want the desired key. There are a lot of defects are performed on the consumer side, and thus the user or repairman may misjudge the fault of the motherboard itself even though there is a cause of poor connector connection, etc., thereby causing an error of exchanging an expensive motherboard.

Accordingly, the present invention has been made to solve the above-described problems of the prior art, and by adding a self-diagnosis function to the key input system of the oven range, it is easy to detect and repair a problem between the key input system and the motherboard. The purpose is to provide a key input system that can be.

The key input system of the present invention for achieving the above object, in the key input system connected through a plurality of lines of the motherboard and the connector with a microcomputer, it is composed of a plurality of switches of the matrix form, each of the plurality of switches Is connected to one of the plurality of output ports of the microcomputer through one of the plurality of lines of the connector, and the other end of each of the plurality of switches is the plurality of input ports of the microcomputer through one of the plurality of lines of the connector. It is connected to one of the, characterized in that by configuring at least one or more switches of the plurality of switches in a short state to determine whether there is a failure of the connector line is connected to the switch in the short state through the signal input and output of the short state switch.

Preferably, one end of each of the plurality of switches of the key input system is in a horizontal direction, and the other end thereof is in one of a plurality of input ports and a plurality of output ports of the microcomputer through a plurality of lines of the connector. Common connection to one.

Preferably, the microcomputer of the main board outputs an arbitrary pulse waveform at a predetermined time interval through an output port connected to one end of the switch in the short state and then the pulse through the input port connected to the other end of the switch in the short state. It is determined whether a waveform is input, and if the pulse waveform is not input, each line of a connector connected to one end and the other end of the short switch is configured to output a connection error.

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Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, a key input system according to the present invention will be described with reference to the accompanying drawings.

3 is a circuit diagram illustrating a connection state between a key input system and a main board according to the present invention.

In the connection state between the key input system and the main board according to the present invention, if the connector connecting the main board (main PCB assembly) in which the key input system and the microcomputer are built in is properly connected, an arbitrary signal continues at a set interval. If the contact point of the connector is unstable, the signal is not transmitted to the motherboard, so the microcomputer self-diagnoses whether it is properly connected through the connector between the key input system and the motherboard. The error code is displayed on the display to inform the user or the repairman of the connector connection failure.

The key input system (key input unit 40) of the present invention for this purpose is mainly connected to the motherboard 30 and the connector 32 in which the microcomputer 31 is built, and the user through the key input unit 40 When a desired key is input, a corresponding signal is transmitted to the microcomputer 31 of the motherboard 30 through the connector 32.

As shown in FIG. 3, the key input unit 40 according to the present invention includes a plurality of input keys (switches) SW01, SW02, ..., SW19 in a matrix form. When the ..., SW19) is selected, the key input signal generated from the input keys SW01, SW02, ..., SW19 is transmitted to the microcomputer 31.

At this time, the first to fourth ports (port1 to port4) of the first to ninth ports (port1 to port9) of the microcomputer 31 are output ports, and output arbitrary pulse waveforms sequentially and periodically at intervals of each other. do.

The fifth to ninth ports port5 to port9 are input ports, and any pulse waveforms sequentially and periodically outputted through the first to fourth ports port1 to port4 are inputted, and which inputs are input. The microcomputer 31 checks whether the input is made through the ports (ports 5 to 9), and determines whether the user inputs a key and, if the key is input, which key is input.

At this time, one end of the input key (switch) in the horizontal direction, the other end of each input key (switch) in the vertical direction through a plurality of lines of the connector 32 a plurality of input ports (port5 ~ port9) It can be seen that the common connection to one of the one and a plurality of output ports (port1 ~ port4).

In the key input unit 40 of the present invention, one of the output ports port1 to port4 and one of the input ports port5 to port9 are shorted. 2 illustrates that the first port port1 of the output port and the ninth port port9 of the input port are always shorted.

Therefore, in this case, even if the user does not press an input key, the output signal of the first port port1 which is the output port is input to the microcomputer 31 through the ninth port port9 which is the input port at regular intervals.

Therefore, if the connection status of line 1 or 9 of the connector 32 is unstable or poor, the output signal of the first port port1, which is an output port, is not input to the ninth port port9, which is an input port. In this case, a code indicating an error in the connection between the key input unit 40 and the connector 32 of the main board 30 is displayed on the display unit (13 of FIG. 1), thereby allowing a user or a repairman to solve the problem, for example, in the oven range. The cause can be easily identified and appropriate response can be made accordingly.

And if SW15 is always in short status, you can check the connection status unstable or bad connection of line 2 and 8 of the connector. If SW10 is always in short status, connection status of line 3 and 7 of the connector is unstable or It can check the connection failure, and if SW05 is always in short status, you can check the unstable connection or connection failure of line 4 and 6 of the connector, and make one of SW01, SW02, SW03, and SW04 always short. If so, you can check the connection status of the connector line 5 or connection failure.

That is, the shorted input port and output port are respectively connected to one end and the other end of one input key (switch) through different lines among the plurality of lines of the connector 32.

The key input system of the present invention described above has the following effects.

First, if the connection status of the connector is unstable, the error code is displayed to prevent an error of exchanging an expensive main board by mistaken for a bad motherboard even though the main board is normal.

Second, even in expensive ovens or complex models that are difficult to disassemble and install, rapid repair due to a defective connector is possible.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (4)

In the key input system connected through a plurality of lines of the motherboard and the connector with a microcomputer, A plurality of switches in a matrix form, one end of each of the plurality of switches is connected to one of the plurality of output ports of the microcomputer through one of the plurality of lines of the connector, and the other end of each of the plurality of switches Connect to one of a plurality of input ports of the microcomputer through one of a plurality of lines of the at least one switch of the plurality of switches configured in a short state of the switch of the short state through the signal input and output of the short state switch The key input system, characterized in that for determining whether the connector line is defective. The method of claim 1, One end of each of the plurality of switches of the key input system is common to one of a plurality of input ports and one of a plurality of output ports of the microcomputer through a plurality of lines of the connector in a horizontal direction and each other end in a vertical direction. Key input system, characterized in that connected. The method of claim 1, The microcomputer of the main board outputs an arbitrary pulse waveform at a predetermined time interval through an output port connected to one end of the short switch, and then the pulse waveform is input through an input port connected to the other end of the short switch. And determining whether or not the pulse waveform is input, and outputting through the display unit that each line of the connector connected to one end and the other end of the shorted switch is a connection error. delete

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