JPH03146098A - Controller for washing machine - Google Patents

Abstract

PURPOSE:To suppress damage for cloth in a washing tank or the generation of an impact sound when restarting a dehydrating operation and to prevent the reliability of a change gear mechanism from being lowered by detecting the falling of an output signal from the ON/OFF detector of a power supply switch, inhibiting a driving signal to a motor and a drainage valve, outputting the driving signal to the drainage valve when the rising is detected with the output signal more than a prescribed value, and afterwards outputting the driving signal of the motor after the lapse of fixed time. CONSTITUTION:A microcomputer 12 detects the A point of the falling when the output signal of an ON/OFF detector 11 is lowered, turns OFF switching elements 13 and 15 and stops the drive of a drainage valve 8 and a motor 6. Next, when a power supply switch 9 is turned ON with a voltage more than a B point, the microcomputer 12 detects that the output signal reaches a C point as the start, and conducts the switching element 15 in order to return to a state before turning OFF the power supply switch 9, namely, in order to continue a dehydrating state. Then, the drainage valve 8 is driven. However, since the drainage valve 8 is geared motor type, time delay is generated until the operation is completely finished. The microcomputer 12 drives the motor 6 after the drainage valve 8 is completely operated, namely, after the lapse of the fixed time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a washing machine control device equipped with a power switch on/off detection device.

Conventional technology In recent years, fully automatic washing machines have rapidly become quieter, and in order to reduce the sound of the button clicking during draining, the conventional lenoid system has been replaced with a system that uses a geared motor to slowly drive the drain valve. Things are changing. The configuration of this fully automatic washing machine will be explained with reference to FIG. In the figure, reference numeral 1 denotes a washing/drying tub (hereinafter referred to as a washing tub), and an agitating blade 2 is rotatably disposed at the inner bottom of the washing tub 1. The washing tub 1 is housed in a water receiving tank 3, and the water receiving tank 3 is supported by an outer casing 5 in a vibration-proof manner by a suspension 4. A motor 6 is disposed below the water receiving tank 3, and the rotational force of the motor 6 is transmitted to the stirring blade 2 via a speed change mechanism 7.

, 8 is a guard motor-type drain valve, which is driven when draining the water in the washing tub 1. Furthermore, during spin-drying, the rotational force of the motor 6 is transferred to the washing tub 1 via a speed change mechanism 7 that is linked to the drain valve 8. to communicate. A power switch 9 supplies AC power to the motor e and the drain valve 8.

Next, the circuit configuration of the washing machine is shown in FIG. In the same figure, 6 is the motor shown in FIG. 2, 8 is the same drain valve, and 9 is the same power switch. 1° is an AC power source, which supplies power to the motor 6 and drain valve 8 via a power switch 9. 11 is an off detection device for detecting whether the power switch 9 is turned on or off, and resistors 111.112
and a diode 113, and a smoothing circuit including a capacitor 114 and a resistor 116. 12 is a microcomputer which is a control means for controlling washing, rinsing, and dehydrating operations. The microcomputer 12 connects switching elements 13, 14, 15iC horizontal motor 6 and drain valve 8 via inverter 1e.
controls the operation of

The microcomputer 12 receives the output signal of the on/off detection device 11 and detects the state of the power switch 9.

Problem to be Solved by the Invention According to the above (a), the time chart in Fig. 4 shows the operating state of the washing machine when the power switch 9 is repeatedly turned on and off in a short period of time during dehydration operation. This is explained by: 1. With the power switch 9 in the on state, the microcomputer P 12 sets the MG drive signal to "H" and the M1 drive signal to "H", makes the switching elements 15 and 13 conductive, and connects the drain valve 8 and the motor 6. When the power switch 9 is turned off from on while the dewatering operation is being performed, the supply of AC power 1° to the drain valve 8 and motor 6 is stopped, the brake is applied, and at the same time The output signal of the on/off detection device 11 of the power switch 9 gradually changes to the input voltage to the microcomputer 12 as shown in FIG. is decreasing. here,
If the power switch 9 is turned on again when the microcomputer 12 has not reached the level at which it detects that the power switch 9 has been turned off, the microcomputer 12's M
Since the 1 drive signal and the MG drive signal are @H''', the AC power 1o is immediately supplied to the motor θ and the drain valve 8, and the dewatering operation is attempted again.The motor 8 immediately starts rotating. However, the drain valve 8 requires time to complete its operation after the AC power supply 1Q is supplied.For this reason, as shown in FIG. In other words, only the agitation blade 2 of the washing machine rotates, and then when the drain valve 8 completes its operation, the dehydration operation starts, which prevents fabric damage in the washing tub and impact noise when the dehydration operation restarts. In addition, there were problems such as a decrease in the reliability of the transmission mechanism.

Therefore, the present invention prevents the above-mentioned development from occurring even if the power switch is turned on and off in a short time.
Our aim is to provide high quality washing machines.

Means for Solving the Problems And in order to achieve the above object, the present invention detects the fall of the output signal of the logging device when the power switch is turned on and off, and prohibits the drive signal to the motor and drain valve. With,
When the rise of the output signal is detected at a predetermined value or higher, a drive signal to the drain valve is output, and then a drive signal to the motor is output after a certain period of time.

For production The washing machine control device of the present invention is based on the above Fil\ or.

Even if the power switch is turned on and off for a short period of time during dewatering, the motor is driven only after the drain valve is completely driven. As a result, stable dehydration operation becomes possible.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1, 2, and 3. 1 and 2 are the same as those described above. FIG. 3 is a time chart of the present invention, which shows the operating state of the washing machine when the power switch is repeatedly turned on and off in a short period of time during spin-drying operation.

~With the power switch 9 on, the microcomputer 12 sets the MG drive signal to 5H' and the M1 drive signal to "H", makes the switching elements 13 and 16 conductive, and drives the drain valve 8 and motor 6. If you turn the power switch 9 from on to off while dehydration is in progress,
The supply to the AC power supply 1o to the drain valve 8 and the motor 6 is stopped, and the brake is not applied.At the same time, the output signal of the on/off detection device 11 of the power switch 9 is output from the capacitor 114 of the smoothing circuit. Since the charge is discharged through the resistor 115, the input voltage to the microcomputer 12 gradually decreases. Here, the microcomputer 12 detects the falling edge point A of this output signal, sets the MG drive signal and the M1 drive signal to 'L', turns off the switching elements 13 and 15, and turns off the drain valve. 8 and motor 6 are stopped.

Next, the output signal of the on/off detection device 11 of the power switch 9 is detected by the microcomputer 12.
If you turn on the power switch 9 again before reaching point B, that is, when the voltage is higher than point B, it will turn on.
Since the AC power supply 1o is supplied to the off detection device 11, the output signal gradually increases. At this time, the microcomputer 12 detects that this output signal is 0 at the rising edge.
In order to detect that the point has been reached and return to the state before the power switch 9 was turned off, that is, to continue the dehydration state, the MG drive signal is set to 'H' and the switching element 15
The drain valve 8 is made conductive and the drain valve 8 is driven, but since the drain valve 8 is of the geared motor type, a time delay occurs before its operation is completely completed. Microcomputer 1
2 sets the M1 drive signal to 1H'' after the drain valve 8 has completely operated, that is, after a certain period of time, and drives the motor 6.

As a result, even if the power switch is turned on and off for a short time during dehydration, stable dehydration operation can be reliably continued.

Effect of the invention As described above, the present invention operates only when the power switch is turned on.

- Detects the fall of the output signal of the OFF detection device, prohibits the drive signal of the motor, drain valve, etc., and furthermore, when the output signal is higher than a predetermined value and detects the rise, the drive signal of the drain valve is Since the motor drive signal is output after a certain period of time after outputting the This has the effect of suppressing damage to the fabric inside the tank and the generation of impact noise when restarting the dehydration operation, as well as not impairing the reliability of the transmission mechanism. Furthermore, even in the event of a momentary power outage of the AC power supply, the falling edge of the on/off detection signal is detected.
Since the drive signal to the load is prohibited, it also has the effect of increasing the ability to withstand instantaneous power outages.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the circuit configuration of a fully automatic washing machine, Fig. 2 is a block diagram of the fully automatic washing machine, Fig. 3 is a time chart of the control of the present invention, and Fig. 4 is a time chart of conventional control. It is. 6...Motor, 8...Drain valve, 9...
. . . Power switch, 11 . . . On/off detection device, 12 . . . Control means.

Claims (1)

[Claims] a motor for rotating an agitating blade of a washing machine; a drain valve for draining water in a washing tub of the washing machine and transmitting the rotational force of the motor to the washing tub of the washing machine via a speed change mechanism during dewatering; a power switch that supplies alternating current power to the motor and the drain valve; an on/off detection device comprising a rectifier circuit and a smoothing circuit for detecting whether the power switch is on or off; and a control means for controlling the dewatering operation. has
The control means detects the fall of the output signal of the on/off detection device, prohibits the drive signal to the motor and the drain valve, and when the output signal rises above a predetermined value is detected, controls the drive signal to the drain valve. A washing machine control device that outputs a motor drive signal after a certain period of time after outputting a motor drive signal.