KR20010048543A - A sensing circuit of open or close for washer' door - Google Patents

Abstract

PURPOSE: A door opening sensing circuit is provided to check opening of a door in a washer by receiving an AC pulse signal through a micom and to minimize malfunction of system by noise while simplifying circuit structure. CONSTITUTION: A door open sensing circuit comprises a door switch(51) outputting a door sensing signal of AC voltage shape by turning on while closing the door and turning off while opening the door; a photo coupler(52) dividing the door sensing signal through first and second resistances(R1,R2) and converting the divided signal into a pulse signal via diodes(D1,D2) and a first condenser(C1); and a micom(53) controlling to normally operate system by deciding opening of the door while the pulse signal is not delivered to the photocoupler. The micom checks opening of the door by using the AC voltage without convert of DC voltage to reduce influence of noise.

Description

A sensing circuit of open or close for washer 'door}

The present invention relates to a door opening and closing detection circuit of a washing machine, and in particular, it is applied to a drum washing machine to grasp the opening and closing state of the door with a simple circuit configuration, and detects the opening and closing of the door by the pulse signal of the AC type, so that the erroneous detection by noise is ensured. It relates to a door opening and closing detection circuit of the washing machine that can be prevented.

In general, a drum washing machine is a washing machine in which a plurality of small perforated drums are rotated with a horizontal axis as a point, and the laundry is lifted by the lift inside the drum and dropped on the water surface.

1 and 2, the structure of the drum washing machine includes a door (2) for putting laundry in and out of one side of the outer case (1); A tub 3 and a drum 4 in which laundry is filled in the door 2 to perform washing; A water supply valve 5 and a water supply hose 6 for supplying water into the drum when power is applied to the system; A detergent container 7 connected to the water supply hose 6 and supplying detergent to the drum 4; A water supply bellows (8) installed between the detergent container (7) and the tub (3) to allow the detergent to enter the drum (4) and perform expansion joints for vibration prevention;

Water level sensor for detecting the water level through the water pressure to determine whether the water supplied to the drum (4) through the water supply valve (5), water supply hose (6), detergent container (7), water supply bellows ( 9); A water level sensor hose (10) for transmitting the water pressure in the drum (4) to the water level sensor (9); A motor 11 for driving the drum 4 when the water supply stop is determined through the water level sensor 9;

A belt (12) and a pulley (13) for washing by interlocking with the motor (11) so that forward or reverse rotation of the drum (4) is performed; A draining bellows 14 through which water inside the drum 4 is discharged when washing is completed; A drain pump 15 for pumping up the water delivered through the drain bellows 14; A drain hose 16 for discharging the water pumped by the drain pump 15 to the outside; The gasket 17 is installed between the door 2 and the tub 3 to prevent leakage of water.

In particular, the lift (4 ') is installed in the drum (4) so that the laundry is pulled up to reach a certain height and the laundry can be dropped by gravity.

In the conventional washing method using the drum washing machine configured as described above, the user opens the door 2, inserts the laundry into the drum 4 properly, closes the door 2, and is installed in the out case 1. When the washing course is selected through (not shown) and the start button (not shown) is pressed, water enters the water supply valve 5 through a hose outside the washing machine connected to the faucet.

Then, the detergent enters into the drum 4 together with the water into the water supply hose 6, the detergent container 7, and the water supply bellows 8 through the water supply valve 5, and the inside of the drum 4 is fixed. When the water is filled up to the height, the water pressure inside the tub 3 is transmitted to the water level sensor 9 through the drain bellows 14 and the water level sensor hose 10 connected to the tub 3 to stop the water supply. Valve 5 power off).

In the above, when the water supply is stopped, the motor 11 is driven to perform the washing stroke while the drum 4 rotates forward or reverse through the belt 12 and the pulley 13 interlocked with the motor 11. Become

On the other hand, in the general upright washing machine is installed in the top-cover (top-cover) is opened and opened toward the top, whereas the drum washing machine is installed on one side of the outer case (1) as shown in Figure 1 opened and opened toward the front Will be.

Therefore, when the door 2 is opened while the washing machine is operating, it is always important to check the closed state of the door 2 since the laundry or the washing water filled in the drum 4 is discharged or bounced outward.

To this end, as shown in FIG. 3, the circuit for detecting a door lock state is turned off when the door 2 is open, and is turned on when the door 2 is closed to generate an AC voltage signal. A door switch 21; First and second resistors R1 and R2 for receiving an AC signal from the door switch 21 and distributing it; A first capacitor C1 for smoothing and outputting the voltages divided by the first and second resistors R1 and R2; When the voltage smoothed in the first capacitor C1 is converted into a DC voltage 5V through the second capacitor C2, the transistor Q, and the photocoupler P, the door 2 is opened / closed. It is composed of a microcomputer 22 that checks the state and performs the overall control function of driving the system according to the result of the check.

Reference numerals R3 to R6, which are not described in FIG. 3, represent third to sixth resistors, reference numeral C3 denotes a third capacitor, and reference numerals D1 and D2 denote first and second diodes, respectively.

In the conventional door opening and closing detection circuit of the washing machine configured as described above, when the door 2 is closed, the door switch 21 is turned on to generate a signal in the form of an alternating voltage to be transmitted to the first and second resistors R1 and R2. do. Then, the first and second resistors R1 and R2 receive the AC voltage and distribute it to the first capacitor C1, and the divided voltage is smoothed in the first capacitor C1. .

As such, the voltage smoothed by the first capacitor C1 is converted into a DC voltage of 5V while being passed through the second capacitor C2, the transistor Q, and the photocoupler P, and then transferred to the microcomputer 22. .

Then, when the microcomputer 22 inputs a DC voltage of 5V as shown in FIG. 4A, the microcomputer 22 determines that the door 2 is in a closed state. On the contrary, when the door 2 is opened, the microcomputer 22 shows the microcomputer 22. Since the voltage of 0V is input as shown in (b) of 4, the open state of the door 2 can be confirmed.

However, in the conventional case, since the AC signal is converted into the high and low signals of 5V and 0V as described above to confirm the open / closed state of the door 2, the number of circuit components is required. In addition, there is a problem in that the cost is increased by having a complicated circuit configuration, and vulnerable to noise.

Therefore, in the conventional case, when the microcomputer 22 is vulnerable to noise and a noise component is added when the opening / closing state of the door 2 is checked, it is determined that the door 2 is closed even though the door 2 is currently open. And even though the door is in the closed state can be determined that the door (2) is open because the system may malfunction, there is a problem that the washing operation is not performed smoothly.

The present invention has been made to solve the above problems of the prior art, the purpose of which is to check whether the door of the washing machine opening or closing the microcomputer received through the AC pulse signal through this, the circuit configuration becomes simple and at the same time the system malfunction due to noise This is to provide a door opening and closing detection circuit of the washing machine can be almost or minimized.

1 is a side cross-sectional view showing the internal structure of a general drum washing machine,

2 is a plan view of the drum washing machine viewed from the direction 'A' of FIG.

3 is a circuit diagram showing the configuration of the door opening and closing detection circuit of the washing machine according to the prior art,

4 is a signal waveform diagram according to the door closed (a) / open (b) state to be transferred to the microcomputer by FIG.

5 is a circuit diagram showing the configuration of the door opening and closing detection circuit of the washing machine according to the present invention;

6 is a signal waveform diagram according to the door closed (a) / open (b) state to be delivered to the microcomputer by FIG.

<Explanation of symbols about main part of drawing>

51: door switch 52: photocoupler

53: microcomputer R1, R2, R3: first to third resistor

C1, C2: first and second capacitors D1, D2: first and second diodes

According to a feature of the door opening and closing detection circuit of the washing machine according to the present invention for solving the above problems, the switching unit for generating and outputting an AC type door closing detection signal when the door is closed to detect whether the door is open or closed; A signal processing unit receiving the door closing detection signal of the switching unit and converting the signal into a pulse signal that can be processed by the system; The microprocessor includes a microcomputer that determines the open / closed state of the door according to whether the signal processor outputs the pulse signal and receives the pulse signal and checks the closed state of the door through the washing machine to perform normal control functions. It is done by

According to an additional feature of the present invention, the signal processing unit receives an AC-type door closing detection signal output from the switching unit and distributes it, and a voltage distribution unit for transmitting the voltage distributed by the voltage distribution unit to the microcomputer And a photo coupler unit for converting the signal into pulse signals.

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

3 is a circuit diagram showing a configuration of a door opening and closing detection circuit of a washing machine according to the present invention. Referring to the present invention, the door is opened while the door is closed while the door is closed. A door switch 51 for generating and outputting; The door detection signal of the door switch 51 is received and distributed through the first and second resistors R1 and R2, and the divided voltage is passed through the diodes D1 and D2 and the first capacitor C1. A photocoupler 52 for converting and outputting the pulse signal; The photocoupler 52 receives the pulse signal and checks the closed state of the door through the photocoupler 52, and if the pulse signal is not transmitted from the photocoupler 52, the door is opened to determine the open / closed state of the door accurately. Accordingly, the system is composed of a microcomputer 53 that performs various control functions so that the system operates normally.

The microcomputer 53 checks whether the door is closed by using the AC voltage itself without the need for the DC voltage conversion process, and thus the effect of the noise is little or minimized.

The operation of the present invention configured as described above, the user to check whether the door is completely closed in order to proceed with the washing operation after performing the opening operation of the door, such as putting the laundry or put detergent for washing.

To this end, the door switch 51 does not output any signal because the door is always in the off state, but generates a door detection signal immediately after the door is closed to the first and second resistors R1 and R2. Will be delivered.

Then, the first and second resistors R1 and R2 receive and distribute the door detection signals, and the divided voltages are diodes D1 and D2, the first capacitor C1 and the photocoupler 52. The signal is converted into a pulse signal through the third resistor R3 and the second capacitor C2 to be transferred to the microcomputer 53.

Therefore, when the microcomputer 53 transmits the pulse signal as shown in FIG. 6A through the photocoupler 52, the microcomputer 53 determines that the door is closed and performs a normal washing operation. If no signal is transmitted as shown in (b) of FIG. 6, since the current door is open, a warning sound or a warning message is output to allow the user to completely close the door.

The door open / close detection circuit of the washing machine according to the present invention configured as described above may receive an AC signal itself in a pulsed manner having a square wave to check whether the door of the washing machine is opened or closed, thereby preventing system malfunction due to noise. At the same time, the circuit can be easily configured using a small number of components such as resistors, diodes, and photocouplers, thereby reducing costs.

Claims (2)

A switching unit for generating and outputting an AC-type door closing detection signal when the door is closed to detect whether the door is opened or closed; A signal processing unit receiving the door closing detection signal of the switching unit and converting the signal into a pulse signal that can be processed by the system; The microprocessor includes a microcomputer that determines the open / closed state of the door according to whether the signal processor outputs the pulse signal and receives the pulse signal and checks the closed state of the door through the washing machine to perform normal control functions. Door opening and closing detection circuit of the washing machine, characterized in that made. The method of claim 1, The signal processing unit receives an AC-type door closing detection signal output from the switching unit and distributes it, and a photo coupler unit converting the voltage distributed by the voltage distribution unit into a pulse signal for transferring to the microcomputer. Door opening and closing detection circuit of the washing machine comprising a.