JPS63117795A - Controller for washing machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a washing machine control device that determines and controls the load amount of clothes.

Conventional technology Conventional washing machine control devices measure the voltage rise time of the phase advance capacitor of the dehydration capacitor-type induction motor at the start of the dehydration process, determine the load amount of clothes based on the measured time, and determine the dehydration time and the like. Controls such as overtime were performed.

An example of a conventional washing machine control device will be described below with reference to the drawings.

FIG. 4 is a circuit diagram of a conventional washing machine control device. Fourth
In the figure, 1 is a dewatering motor, 2 is a phase advancing capacitor of the dehydrating motor 1, and the dehydrating motor 1 is operated by a bidirectional thyristor (hereinafter abbreviated as thyristor) 4.5 that controls a series of operations of the washing machine. On-off control is provided via the Reference numeral 6 denotes a comparator that outputs an output when the voltage across the phase advance capacitor 2 exceeds a certain voltage.
The voltage v1° rectified by the diode 9 and smoothed by the capacitor 1° and the voltage of the AC power supply 11 are connected to the resistor 12.13.
The voltage vI^ which is divided by the diode 14, rectified by the diode 14, and smoothed by the capacitor 15 is compared, and the voltage V
When ie exceeds the voltage V,^, an "H" signal is output.

16.17 is the discharge resistor of capacitor 10.15, 18
．． 19 is a resistor for limiting the gate current of thyristors 4 and 5;
20 is a DC power supply.

Next, the operation of the conventional washing machine control device having the above configuration will be explained. First, when entering the dewatering process, the control circuit 3 turns on the thyristor 4 and starts the dewatering motor 1. Dehydration motor 1
When starts to start up, the voltage across phase advance capacitor 2 is V. increases as shown in FIG. In FIG. 5, curve A represents the voltage V across the phase advance capacitor 2 when the amount of clothing loaded is small, and curve B represents the voltage V across the phase advance capacitor 2 when the amount of clothing loaded is large. shows an increasing curve. When the dehydration motor 1 is started, the voltage vc across the phase advance capacitor 2 is equal to the voltage VO of the AC power supply 11;
c increases as the rotational speed increases.

When the rotation becomes steady rotation, the voltage stabilizes at a constant level.

At this time, if the load of clothing is small, the voltage ■. rises quickly, and when there are many, it slows down. Therefore, a constant reference voltage V is set, and the amount of load on the cloth is determined by measuring the time (t^-job (to-to)) from when the dewatering motor 1 is started until the voltage rises to the reference voltage V. Specifically, from the start of the dehydration motor 1 in the control circuit 3, a voltage VI corresponding to the voltage vo across the phase advance capacitor 2 is set.
The time until the output of the comparator 6 becomes atH+t when O exceeds a voltage v1^ corresponding to a constant reference voltage v1 formed by dividing, rectifying and smoothing the voltage VO of the AC power supply 11 is measured. The amount of load on the clothes is determined based on the length of time, and subsequent spin-drying and rinsing times are controlled.

Problems to be Solved by the Invention However, in the above-mentioned conventional configuration, since the voltage of the "d!!" phase capacitor 2 is detected and controlled at one reference time, clothes may be unwound when the dehydration motor 1 is started. This method is easily affected by unbalanced conditions, and as a result, there is a problem in that the load amount of clothing is incorrectly determined.

The present invention solves the above-mentioned problems, and aims to provide a washing machine control device that can accurately determine the load amount of clothes even if the clothes become unbalanced when the dehydration motor starts. It is.

Means for Solving the Problems In order to solve the above problems, the present invention provides a detection circuit that detects the voltage of a phase advance capacitor of a dehydration motor by comparing it with two reference voltages, and a detection circuit that detects the voltage of a phase advancing capacitor of a dehydration motor when starting the dehydration motor. measuring the time for the voltage of the phase advance capacitor detected by the detection circuit to rise from a first reference voltage to a second reference voltage, and determining the magnitude of the load on the clothing based on the magnitude of the measured time; The washing machine has a control circuit that controls a series of washing machines.

Effect With the above configuration, after the dehydration motor starts to start, the time from when the voltage of the phase advance capacitor reaches the first reference voltage until it rises to the second reference voltage is measured, and this time is calculated. Since the size of the clothes load is determined based on the size, the time can be measured from the time when the rotation of the dehydration motor becomes normal and starts rotating, and the time can be measured from the time when the dehydration motor becomes unbalanced when starting up. Regardless of the time.

It is possible to accurately determine the amount of clothing loaded.

Example An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a circuit diagram of a washing machine control device showing one embodiment of the present invention. Components that are the same as those in the conventional example are given the same reference numerals and descriptions thereof will be omitted. In Figure 1, 21 is AC power supply 1
A resistor 13 is used to switch the voltage division ratio of 1 voltage to 2 stages.
A transistor 22 connected in parallel to the resistor 21 is configured to short-circuit the resistor 21 and switch the voltage division ratio of the AC power supply 11 in response to a command from the control circuit 3. 23 is a resistor for limiting the base current of the transistor 22.

The operation of the washing machine control device having the above configuration will be explained with reference to the flowchart of FIG. 2 and the rising voltage characteristic diagram of FIG. 3.

When the dehydration process begins, the control circuit 3 turns on the transistor 22 (step 31), short-circuits the resistor 21, divides the voltage of the AC power supply 11 between the resistor 12 and the resistor 13, and rectifies and smoothes this voltage. is the voltage Vc across the phase advance capacitor 2
is set in the comparator 6 as the first reference voltage ■□ to be compared with. therefore.

The comparator 6 outputs a signal H71 when the voltage Vc across the phase advancing capacitor 2 reaches the voltage V.Next, when the thyristor 4 is turned on and the dehydration motor 1 is started (step 32 ), the voltage Vc across the phase advance capacitor 2 increases as shown in FIG.
indicates a rising curve of the voltage Vc across the phase advance capacitor 2 when the load amount of clothing is small, and the curve shows an increase curve of the voltage Vc across the phase advance capacitor 2 when the load amount of clothing is large.

Simultaneously with the start of this dehydration motor 1, the count of the motor lock detection timer is started (step 33).
, monitors whether the output of the comparator 6 is "H" (step 34). If the output of the comparator 6 is not "HPP", monitor whether the count of the motor lock detection timer has exceeded the reference time (step 35); if it is determined that the count has not exceeded the reference time, return to step 34;
If it is determined that the voltage Vc of the phase advance capacitor 2 does not reach the voltage V□ within the reference time and the count exceeds the reference time due to locking of the dehydration motor 1 or significant unbalance of the clothes, the dehydration motor 1 is stopped (step 36), and an abnormality occurs. (Step 37). If the rotation of the dehydration motor 1 is normal, the voltage Vc of the phase advance capacitor 2 increases to the voltage Vc within the reference time, and the output of the comparator 6 becomes tt Hu. When it is determined that the output of the comparator 6 has become "H", the count of the cloth amount detection timer is started (step 3).
8). Then, step 3 turns off the transistor 22.
9), insert a resistor 21 in series with the voltage dividing resistor 13,
The voltage of the AC power supply 11 is connected to the resistor 13.21 in series with the resistor 12.
The voltage obtained by rectifying and smoothing this voltage is set in the comparator 6 as the second reference voltage v2, and then the voltage Vc of the phase advance capacitor 2 reaches the voltage v2, and the output of the comparator 6 becomes "H". (step 40). If it is determined that the output of the comparator 6 is not "H"', step 40 is repeated, and if it is determined that the output of the comparator 6 is "H17", the count of the cloth amount timer is stopped (step 41).
, the count value of the cloth amount timer, that is, the phase advance capacitor 2
The amount of load on the clothes is determined based on the time it takes for the voltage Vc to rise from the voltage v1 to the voltage (2) (step 42), and thereafter the process is controlled in accordance with the amount of load on the clothes.

In Figure 3, when the amount of clothing loaded is small (curve C)
Then, the time it takes for the voltage Vc across the phase advance capacitor 2 to rise from the voltage v1 to the voltage v2 is (t^□-tao), and when the load of clothing is large (curve D), this time is (j
BL-j Bo), and by measuring these times, the load amount of clothing is determined.

In this way, the reference voltages to be compared by the comparator 6 are set to two stages of voltages V By measuring the time, the load amount of clothes can be accurately determined without being influenced by a delay in starting the dehydration motor 1 due to unbalance of the clothes. Moreover, after the dehydration motor 1 starts, the voltage Vc across the phase advance capacitor 2 becomes the first
By measuring the time it takes for the voltage to rise to the reference voltage V, it is possible to easily detect a lock in the dewatering motor 1 or a significant imbalance in the clothes.

In addition, in this example, in order to correct fluctuations in AC voltage,
Although the voltage of the phase advancing capacitor 2 and the reference voltage obtained by dividing the voltage of the AC power supply 11 are compared, they may be compared with the reference voltage obtained by dividing the voltage of the DC power supply 20.

Effects of the Invention According to the present invention, the time from when the dehydration motor starts rotating normally is measured by measuring the rise time between two reference voltages, and the amount of clothing loaded is determined based on this. Therefore, the amount of load on clothes can be determined accurately without being affected by delays in starting the dehydrating motor due to unbalance of clothes.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a control device for a washing machine which is an embodiment of the present invention, Fig. 2 is a flowchart of the control of the same control device, and Fig. 3 is a phase advance of the dehydration motor when the control device starts the dehydration motor. A characteristic diagram showing the rise characteristics of the voltage across the capacitor. Figure 4 is a circuit diagram of a conventional washing machine control device. Figure 5 shows the rise in voltage across the dehydration motor phase advancing capacitor when the dehydration motor is started by the same control device. FIG. 3 is a characteristic diagram showing characteristics. 1... Dehydration motor, 2... Phase advance capacitor, 3...
・Control circuit, 6... Comparator, 11... AC power supply, 2
0...DC power supply. Agent Yoshihiro MorimotoFigure 3Figure 5

Claims (1)

[Claims] 1. A detection circuit that detects the voltage of the phase advance capacitor of the dehydration motor by comparing it with two reference voltages; and a detection circuit that detects the voltage of the phase advance capacitor of the dehydration motor by comparing it with two reference voltages; A control circuit that measures the time for the voltage to rise from a first reference voltage to a second reference voltage, determines the magnitude of the load of clothes based on the measured time, and controls a series of washing machines. A washing machine control device with. 2. If the control circuit detects that the time from the start of the dehydration motor until the detection circuit detects that the voltage of the phase advance capacitor has increased to the first reference voltage exceeds a certain time; 2. The washing machine control device according to claim 1, wherein the washing machine control device determines that the dewatering motor is locked or that the clothes are significantly unbalanced, and performs control accordingly.