KR100409001B1 - A Washing Machine Operating Circuit - Google Patents

Abstract

The present invention relates to a washing machine operating circuit unit including a key input unit for allowing a user to input a command to a washing machine, and a display unit for displaying the externally according to the command input to the key input unit. The circuit part receives the signal passing through the key input part and the option resistor part through the same port of the micom part consisting of limited pins and ports, thereby reducing the number of ports that must be installed in the micom part for each washing machine option, and simplifying the circuit. By operating, it is possible to prevent key input due to the reverse voltage of the LED.

Description

Washing machine operating circuit {A Washing Machine Operating Circuit}

The present invention relates to a washing machine operating circuit unit, and in particular, a washing machine operating circuit unit for allowing a user's command input to a washing machine and information on options of the washing machine to be input through a same input port to a microcomputer in charge of controlling the general matters of the washing machine. It is about.

The washing machine, which has been distributed to the general public so that it is available in any household, has a variety of functions, ranging from simply washing laundry to performing various kinds of washing according to the unique function of the washing machine model on the market.

The user can adjust the washing water level or the temperature of the washing machine through the key input unit of the washing machine which is purchased or used at home. In addition, the user can select various functions such as high speed washing and wool washing at home. While laundry that was difficult to wash easily can be washed, the time required for washing laundry can be reduced depending on circumstances.

In addition, the washing machine is turned on according to the selected information so that the washing machine can know the matter related to the washing administration, such as the water level and temperature of the washing water selected by the user. It was.

However, a plurality of LEDs constituting the LED unit to be turned on in response to a user command input to the key input unit affects the key input unit due to the reverse voltage, which often causes a wrong input of the key input unit.

In order to solve the above problem, a washing machine operation display circuit of Japanese Patent Publication No. Hei 5-37671 has a microcomputer 70 which performs a predetermined operation programmed in advance as shown in Fig. 1, and the microcomputer 70 A scan circuit 71 for switching the next signal by an output signal of the present invention, a switch input circuit 75 connected to the scan circuit 71 to add a signal for operating the washing machine by the microcomputer, and the switch input. An LED display circuit 77 consisting of a printed board connected in series to a circuit 75 and mounted with a plurality of LEDs, and connected between the switch input circuit 75 and the LED display circuit 77 to display the LED display circuit. Diodes 81a, 82b, and 83c for preventing electricity from flowing from the 77 to the switch input circuit 75, and an optional resistor including a plurality of resistors R71 to R76 which are added or removed differently according to a washing machine option. And a key input is prevented through the diodes 81a, 81b, and 81c, and at the same time, the microcomputer 70 can easily grasp the option of the washing machine through the option resistor 78. do.

That is, as the scan waveform output ports co1, co2, and co3 of the microcomputer 70 sequentially output the scan waveforms, the transistors 71a, 71b, and 71c constituting the switch input circuit 75 are the scan waveform output ports. The low voltage waveform at (co1, co2, co3) is conducting on output, and if the user presses the switch 73a of the switch input circuit 75, when the co1 port outputs the low voltage waveform, the high voltage to port B21 is applied. As the waveform of the voltage is input, the microcomputer 70 may know that the switch 73a has been operated.

In this case, information such as water level and water temperature is displayed according to the switch input of the switch input circuit 75 of the LED display circuit 77. For example, when co1 and EO1 simultaneously output a low voltage waveform, the 77a LED of the LED display circuit 77 is turned on. In addition, the diodes 81a, 81b, and 81c may be installed in one direction to prevent the input of a key input due to a reverse voltage when the LED of the LED display circuit 77 is broken.

Table 1 shows options of the washing machine according to the deletion / addition of the resistors R71 to R77 of the option resistor unit 78 of the conventional washing machine operation display circuit.

Microcomputer (70) port Pump Volume Voltage A0 A1 A2 Case1 R71 R72 R73 Nil 5 kg 220 V Case2 R71 R72 R76 Nil 5 kg 240 V Case3 R71 R75 R73 Nil 6 kg 220 V Case4 R71 R75 R76 Nil 6 kg 240 V Case5 R74 R72 R73 With 5 kg 220 V Case6 R74 R72 R76 With 5 kg 240 V Case7 R74 R75 R73 With 6 kg 220 V Case8 R74 R75 R76 With 6 kg 240 V

As shown in the above table, R71 and R74 are added / deleted according to the presence or absence of the pump, R72 and 75 according to the capacity of the washing machine, and R73 and R76 according to the power supply voltage. As shown in FIG. 1, when R71, R72, and R73 are connected to Vss, and R74, R75, and R76 are not connected, the microcomputer 70 has no pump in the washing machine, its washing capacity is 5 kg, and 220V power supply voltage. It recognizes the use of the controller and executes the program accordingly.

However, in the case of the washing machine manipulation display circuit configured as described above, there is a problem in that a plurality of reverse voltage preventing diodes must be used in order to prevent key input by the reverse voltage during component breakage.

Therefore, there is a problem that the circuit constituting the washing machine operation display circuit is complicated, its size is increased, and the manufacturing cost is increased.

The present invention has been made to solve the above problems of the prior art, the object of the key input unit and the key input by using a microcomputer to grasp the information about the user command and washing machine options input to the key input unit through the same port The present invention provides a washing machine operating circuit unit for preventing a reverse voltage between a display unit displaying a negatively input command to the outside.

1 is a circuit diagram showing the configuration of a washing machine operation display circuit according to the prior art,

2 is a circuit diagram showing a configuration of a washing machine operating circuit unit according to the present invention;

3 is a graph showing a scan waveform generated in the washing machine operation circuit unit according to the present invention.

<Explanation of symbols on main parts of the drawings>

10: key input section 20: optional resistor section

30: microcomputer unit 40: display unit

According to a feature of the washing machine operating circuit unit according to the present invention for solving the above problems, an option resistor unit having a different resistance value for each washing machine option, a key input unit for inputting a user command to operate the washing machine, and the option resistor unit And a microcomputer unit for determining the command inputted to the key input unit using the same port to control the overall washing machine according to the input command, and the user to recognize the command as the command input of the key input unit is input to the microcomputer unit. The display unit is configured to display a command of the key input unit input to the microcomputer unit.

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

As shown in FIG. 2, the washing machine operating circuit unit includes a key input unit 10 through which a user inputs a command for operating the washing machine through a key operation, and a resistor arranged differently according to a washing machine option. The option resistor unit 20 and the key input unit 10 and the option resistor unit 20 output the scan waveform so as to know the option of the option resistor 20 and pass through the key input unit 10 and the option resistor unit 20 accordingly. The microcomputer unit 30 determines the options of the washing machine according to the scan waveform and simultaneously controls the washing machine according to the user command input to the key input unit 10, and the key input unit input to the microcomputer unit 30. The user command is displayed on the display unit 40 so that the user can recognize the user command of (10).

In this case, the key input unit 10 may include a first switch sw1 for inputting a command for start / pause, a second switch sw2 for inputting a command for course selection, and a command for reservation. And a third switch sw3 to input, a fourth switch sw4 for inputting a command relating to the water level, and a fifth switch sw5 for inputting a command relating to the type of washing stroke.

In addition, the option resistor unit 20 is provided to the microcomputer 30 and the key input unit 10 so that the signal output from the microcomputer 30 is input to the microcomputer 30 differently according to the washing machine option. It consists of resistors R1, R2, R3, R11, R12, and R13 connected in parallel or in series. Here, the resistors R11, 12, and 13 should always be connected, and R1, 2, and 3 are deleted or added according to the washing machine option. That is, R1 is deleted according to the presence or absence of the pump, R2 is deleted or added depending on the capacity of the washing machine according to the power supply voltage.

In this embodiment, all of R1, 2, and 3 are connected to the option resistor unit 20. Accordingly, the washing machine uses a pump, has a capacity of 5 Kg, and uses a controller for 220V voltage. Table 2 below shows the options of the washing machine according to the removed / added resistance.

division R1 R2 R3 Pump Volume Voltage Case1 With With With Nil 5Kg 220 V Case2 With With Nil Nil 5Kg 240 V Case3 With Nil With Nil 6Kg 220 V Case4 With Nil Nil Nil 6Kg 240 V Case5 Nil With With With 5Kg 220 V Case6 Nil With Nil With 5Kg 240 V Case7 Nil Nil With With 6Kg 220 V Case8 Nil Nil Nil With 6Kg 240 V

In addition, the micom unit 30 uses the three pins P51, P52, and P53 as the key input unit 10 and the option resistor unit 20, as shown in FIG. A first scan waveform output port (SO) for outputting and a first pin consisting of three pins (P70, P71, P72) to receive the scan waveform passed through the key input unit 10 and the option resistor 20 It is configured to include a scan waveform input port (SI). Here, among the ports P51, P52, and P53 constituting the first scan waveform output port SO, P51 and P52 output scan waveforms to the key input unit 10, and P53 signals to the option resistor unit 20. Outputs

In addition, the micom unit 30 is connected to the display unit 40 to operate the display unit 40 according to a user command of the key input unit 10 inputted through the first scan waveform input port SI. The apparatus further includes a second scan waveform input / output port including a plurality of input / output ports P1 to P8 for inputting and outputting scan waveforms.

The moment the user turns on the washing machine, the P53 outputs a high voltage signal, and at this time, the waveform is input to the waveforms input to the ports P70, P71, and P72 forming the first scan waveform input port SI. Accordingly, the microcomputer unit 30 grasps the option of the washing machine. In this embodiment, since the resistors R1, 2, and 3 are all connected to the option resistor unit 20, a high voltage signal is input to the P70 to 72.

In this case, as the high (5V) voltage signal is output from P53, the 5V is distributed by the resistors R1 and R6, so the resistance ratio of R1 and R6 should be appropriately selected so that the high voltage is input to P70 of the microcomputer unit 30. . For example, if R1 = 30㏀ and R6 = 10㏀, the voltage of (5 * 30 / (30 + 10)) V = 3.75V is input to P70 of the microcomputer unit 30 by the resistor distribution so that the voltage is sufficiently high. It can be recognized.

FIG. 3B illustrates waveforms when the first scan waveform input port SI of the scan waveform passing through the option resistor unit 10 is input. As the high voltage waveform of 5V is input to P70, P71, and P72, the microcomputer unit 30 is a model in which the washing machine of the present embodiment uses a pump with a capacity limit of 5Kg and a 220V voltage controller using a pump. Figure out.

Finally, the display unit 40 includes a plurality of LEDs L1 to L16 for displaying the user command to the outside as the user command is input to the key input unit 10 to the microcomputer 30, and the LEDs. And a plurality of transistors Tr1 to Tr8 connected to each other, and a plurality of resistors R5, R6, R7, and R8, and the scan waveform output from the input / output pins P1 to P8 of the microcomputer unit 30 is the LED. After passing through, the scan is performed as input to the microcomputer 30.

Here, the LEDs L1 to L16 of the display unit 40 are not directly connected to the switch of the key input unit 10 and are operated through the microcomputer 30, so that the reverse voltages of the LEDs L1 to L16 are operated. The key misinput of the key input unit 10 due to is eliminated.

Referring to the operation of the present invention configured as described above are as follows.

First, the microcomputer unit 30 using the scan waveform output port SO for outputting the scan waveform to the key input unit 10 and the option resistor unit 20 is connected through the P53 of the scan waveform output port SO. When the initial power is applied, a high voltage signal is output to the option resistor unit 20. The signal output from the P53 passes through the option resistor unit 20 and is input to P70, P71, and P72 of the scan waveform input port SI.

According to the scan waveform input to P70, P71, and P72 as shown in FIG. 3 (b), the microcomputer unit 30 identifies the model of the washing machine by checking the option of the washing machine.

After checking the washing machine option, the microcomputer unit 30 sends a low voltage signal to the P53 and a high voltage to P51 and P52 connected to the key input unit 10 so that a user command input from the key input unit 10 is grasped. Export the scan waveform to perform a key scan.

The microcomputer unit 30 detects the input user command through the key scan, and causes the LED of the display unit 40 to be turned on by scanning the LEDs L1 to L16 of the display unit 40 and the operation status thereof. Check.

The washing machine operating circuit unit of the present invention configured as described above receives a signal passing through the key input unit and the option resistor unit through the same port consisting of a limited pin and a port, and the number of pins and ports to be installed in the microcomputer unit for each washing machine option. By reducing the number of circuits, the circuit is simplified and the LED is operated through the microcomputer, thereby preventing key input due to the reverse voltage of the LED.

Claims (4)

An option resistor having a different resistance value for each washing machine option; A key input unit to which a user command for operating the washing machine is input; A microcomputer unit which outputs a scan waveform to the option resistor unit and the key input unit and accordingly determines the options of the washing machine and the command input to the key input unit using the same port and controls the washing machine overall according to the input command; And a display unit configured to display a command of the key input unit input to the micom unit to the outside of the washing machine so that the user recognizes the command as the command is input to the micom unit. The method of claim 1, The signal passing through the option resistor unit is a washing machine operation circuit unit, characterized in that configured to be input to the microcomputer unit in accordance with the voltage distribution method. The method of claim 1, The microcomputer unit is configured to sense only the voltage input to the input port connected to the option resistance unit immediately after the power is supplied to the washing machine operating circuit unit characterized in that it determines the options of the washing machine accordingly. The method of claim 1, The display unit washing machine operation circuit unit, characterized in that consisting of a plurality of LEDs that are turned on in accordance with the command of the key input unit input to the microcomputer.