JPH0550318B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a dehydration operation device in which the counting operation of a dehydration counter for dehydration operation is controlled in accordance with the opening and closing of a lid switch.

[Technical background of the invention]

In a dehydration operation device equipped with a microcomputer that controls a drive motor that drives a dehydration basket, the drive motor is connected between both terminals of an AC power source via a triax to form a dehydration operation circuit, and the microcomputer A trigger signal is given to the gate of the triax to perform dehydration operation, and when a dehydration counter of a microcomputer finishes counting operation for a set time, the output of the trigger signal is stopped to terminate the dehydration operation. There is. Then, a lid switch that opens and closes in conjunction with the opening and closing of the lid provided above the dehydration basket is provided to interrupt the dehydration operation when the lid is opened.In this case, conventionally, the lid switch The output of the trigger signal to the triac is stopped by directly connecting the dehydration operation circuit or by applying a switching signal from the lid switch to the microcomputer.

[Problems with background technology]

However, in the former case where the dehydration operation circuit is opened directly with the lid switch, the dehydration counter on the microcomputer will continue to count even if the dehydration operation is interrupted, so when the dehydration is restarted, the remaining There was a problem that the dehydration operation time was shortened. In the latter case, when the switching signal of the lid switch is given to the microcomputer, the counting operation of the dehydration counter is interrupted, but since the switching signal of the lid switch is a low voltage and small current, a metal material with good conductivity is used as the lid switch. Not only does it have to use a contact type, which is expensive, but it also has the problem of generating erroneous signals due to the significant influence of noise.Furthermore, when the microcomputer breaks down, the lid is opened and the lid cannot be opened. Even though the brake device is interlockingly applying a braking force to the drive motor, the trigger signal may continue to be applied to the triax, resulting in a problem in which the drive motor becomes locked.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to be able to interrupt the counting operation of the dehydration counter of the microcomputer when the lid switch is opened, and to use an inexpensive lid switch. To provide a dewatering operation device which can be operated without being affected by noise and can stop the dehydration operation when a lid switch is opened even if a microcomputer is out of order.

[Summary of the invention]

In the present invention, a lid switch is interposed in the dehydration operation circuit to directly control the energization and disconnection of the dehydration operation circuit, and a detection means detects whether or not the dehydration operation circuit is energized. The present invention is characterized in that the continuation or interruption of the counting operation of the dehydration counter is controlled by a microcomputer based on the detection.

[Embodiments of the invention]

Hereinafter, an embodiment in which the present invention is applied to a dehydrator side of a two-tub washing machine will be described with reference to the drawings.

First, the electrical configuration of the operating device will be described with reference to FIG.

Reference numeral 1 denotes a single-phase AC power source, one terminal of which is connected to a power bus 3 via a power switch 2, and the other terminal connected to a power bus 4. Reference numeral 5 denotes a lid switch, which is not shown, but is opened and closed in conjunction with the opening and closing of the lid at the upper portion of the dehydration basket. In this lid switch 5, one terminal is connected to the power supply bus 4 and the other terminal is connected to the connection line 6. Reference numeral 7 designates a drive motor that rotationally drives the dehydration basket, and 8 designates a water supply electromagnetic valve that supplies water into the dehydration basket. The dehydration operation circuit 11 is thus configured. As a result, the lid switch 5 is interposed in series with the dehydration operation circuit 11. 12 is a microcomputer, which is
Input ports ₁ and ₂ and output ports Oa and Ob
and positive and negative power supply terminals E+ and E-. It goes without saying that the microcomputer 12 is supplied with DC power. and,
Output port Oa of microcomputer 12 and
Ob is connected to the gates of the triaxes 9 and 10, respectively. Reference numeral 13 denotes a detection circuit as a detection means for detecting opening/closing of the lid switch 5, and this will be described below. 14 and 15 are photocouplers, and the phototransistor 14
a and 15a, each collector is connected to the positive power terminal E+ of the microcomputer 12 via resistors 16 and 17, respectively, each emitter is connected to the negative power terminal E- of the microcomputer 12, and Capacitors 18 and 19 are connected between each collector and emitter, respectively. Further, the collectors of the phototransistors 14a and 15a are connected to the input ports I ₁ and I ₂ of the microcomputer 12, respectively. Furthermore, the light emitting diode 14b of the photocoupler 14 is connected to a protective resistor 20.
The light emitting diode 14b is connected in parallel to the drive motor 7 via the light emitting diode 14b, and a diode 21 having a polarity opposite to that of the light emitting diode 14b is connected in parallel.
Further, a light emitting diode 15b of the photocoupler 15 is connected in parallel to the water supply solenoid valve 8 via a protective resistor 22, and a diode 23 of opposite polarity is connected in parallel to the light emitting diode 15b. ing.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG. 2. FIG. 2 only extracts and shows the portion of the operation of the microcomputer 12 related to dehydration and rinsing.

First, when the power switch 2 is turned on and the dehydration rinse time is set, the microcomputer 1
2 determines ``YES'' in the judgment step A of ``Dehydrating and rinsing?'' and moves to the processing step B of ``Turn on the trigger input to the triact''. Outputs the trigger signal to the next “detection input is “L”
The process moves on to the judgment process C of “Is it?”. In this case, if the user has not closed the lid of the dehydrator, the lid switch 5 is in the open state and the drive motor 7 and water supply solenoid valve 8
Therefore, the light emitting diodes 14b and 15b of the photocouplers 14 and 15 remain off, and the potentials of the collectors of the phototransistors 14a and 15a are at a high level ("H" level), which is the detection signal S <sub>M</sub> and <sub>SW</sub> , and are applied to input ports <sub>I1</sub> and <sub>I2</sub> of the microcomputer 12, respectively. As a result, the microcomputer 12 makes a "NO" determination in the determination step C and returns to the determination step C again. However, when the user closes the lid of the dehydrator and the lid switch 5 is in the closed state, the dehydration operation circuit 11 is closed and the AC power supply voltage is applied to both ends of the drive motor 7 and the water supply solenoid valve 8. Ru. Therefore, photocoupler 14
and 15 light emitting diodes 14b and 15b are turned on, the collector potentials of phototransistors 14a and 15a become low level ("L" level), and the output of detection signals S <sub>M</sub> and <sub>SW</sub> is stopped. As a result, the microcomputer 12
In the determination step C, the determination is ``YES'', and the process moves to the process step 2 of ``Start timer count'', and the dehydration counter that counts the set time for dehydration and rinsing starts counting operation. As described above, when the AC power supply voltage is applied to the drive motor 7 and the water supply solenoid valve 8, the drive motor 7 is driven and rotates the dehydration basket, and the water supply solenoid valve 8 is opened to move inside the dehydration basket. Water is now supplied to the tank, and the dewatering and rinsing operation begins. The dewatering described above is a rinsing method in which the dehydrating basket is continuously rotated by the drive motor 7 and water is continuously supplied into the dehydrating basket by the water supply solenoid valve 8. In the case of a dewatering and rinsing mode in which water is supplied by the water supply electromagnetic valve 8 while the dewatering basket is rotated and the dewatering basket is inertly rotating or stopped, the microcomputer 12 makes the following determination in the determination step C. That is, while the drive motor 7 is rotating, the presence or absence ("H", "L") of the detection signal S <sub>M</sub> is determined based on the output of the trigger signal to the triax 9, and when the water supply solenoid valve 8 is supplying water, the presence or absence of the detection signal S M is determined based on the output of the trigger signal to the triax 9. The presence or absence of the detection signal <sub>SW</sub> (“H”,
“L”). After that, the microcomputer 12 moves to the next judgment step ``Has the set time been reached?'', and if the count value of the dehydration counter has not reached the set time, it judges ``NO''. The process moves to a judgment process similar to the judgment process C described above. Then, when the microcomputer 12 determines "YES" in the judgment step (lid switch 5 is closed), the microcomputer 12 moves to the "continue counting" processing step, and if the dehydration counter is in counting operation, it restarts. This brings us back to the judgment process. Thereafter, the microcomputer 12 sequentially repeats the judgment steps E, F and the processing step G, and when the dehydration counter finishes counting the set time, the answer is "YES" in the judgment step E.
After determining that, the process moves to the next processing step of "turning off the trigger input of triacs", and the output of the trigger signal to the gates of triacs 9 and 10 is stopped. As a result, both the drive motor 7 and the water supply solenoid valve 8 are cut off, and the dewatering and rinsing operation ends.

Now, when the user opens the lid of the dehydrator during the dehydrating and rinsing operation as described above, the lid switch 5 opens in conjunction with this, opening the dehydrating operation circuit 11, and the dehydrating and rinsing operation starts. Driving is interrupted. And the microcomputer 12
In the above-mentioned judgment step, the judgment is "NO" (lid switch 5 is opened), and the process moves to the "interrupt timer count" processing step, interrupts the counting operation of the dehydration counter, and returns to the judgment step E. become. After that, the microcomputer 12
Judgment steps E, F and treatment step I are repeated, but during this time, when the user closes the lid of the dehydrator and closes the lid switch 5, the dehydration operation circuit 11 is closed. The dehydration and rinsing operation will be restarted. And the microcomputer 12
When it moves to the judgment step, it judges "YES" (lid switch 5 is closed) and moves to the processing step. Resume counting operation. The subsequent operation is the same as described above.

As described above, according to this embodiment, the following effects can be obtained. That is, when the user opens the lid during the dehydration and rinsing operation, the lid switch 5 opens and the dehydration operation circuit 11 is opened to interrupt the dehydration and rinsing operation. Since the counter operation of the dehydration counter is interrupted upon detection, there is no need for insufficient dehydration and rinsing time, unlike in the past. In addition, the lid switch 5 is connected to the dehydration operation circuit 11.
Since the switch directly opens the circuit and does not provide the switching signal to the microcomputer 12, there is no need for the lid switch 5 to be an expensive one such as a gold contact. Since it does not generate a switching signal, it is not affected by noise.
Moreover, as mentioned above, the lid switch 5 directly opens the dehydration operation circuit 11, so even if the microcomputer 12 fails, if the lid switch 5 is opened, the drive motor 7 and the water supply solenoid valve 8 are surely disconnected. Therefore, it is possible to reliably prevent the drive motor 7 from being energized and locked while receiving the braking force from the brake device even though the lid switch 5 is opened.

In the above embodiment, a detection circuit 13 using photocouplers 14 and 15 has been described, but the present invention is not limited to this. If so, you can do the same.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and for example, the water supply solenoid valve 8 and related circuit parts may be provided as necessary. Of course, it can be implemented with appropriate modifications within the scope.

[Effects of the Invention] As described above, the present invention includes a lid switch in the dehydration operation circuit, and allows the microcomputer to continue or interrupt the counter operation of the dehydration counter depending on whether or not the dehydration operation circuit is energized. Therefore, when the lid switch is opened, the counting operation of the dehydration counter of the microcomputer can be interrupted, and an inexpensive lid switch can be used, and it is not affected by noise. Moreover, even if the microcomputer fails, the dehydration operation can be stopped when the lid switch is opened, which is an extremely excellent effect.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an electrical configuration diagram, and FIG. 2 is a flow chart for explaining the operation. In the drawings, 5 is a lid switch, 7 is a drive motor, and 8 is a flow chart for explaining the operation.
11 is a water supply solenoid valve, 11 is a dewatering operation circuit, 12 is a microcomputer, and 13 is a detection circuit.

Claims (1)

[Scope of Claims] 1. A dehydration operation device equipped with a microcomputer that controls power on/off of a dehydration operation circuit in accordance with counting operations of a dehydration counter, comprising: a lid switch interposed in the dehydration operation circuit; and a lid switch interposed in the dehydration operation circuit; a detection means for detecting whether or not the circuit is energized; the microcomputer continues the counting operation of the dehydration counter in response to the detection by the detection means as to whether or not the dehydration operation circuit is energized; A dewatering operation device, characterized in that it is configured to control interruptions.