JPS58140804A - Controlling circuit - Google Patents

Abstract

PURPOSE:To prevent a fault of a contact due to spark discharge with a fully automatic washing machine, etc., by cutting off the power supply to a relay contact after other load controlls are all through. CONSTITUTION:An input setting switch 100 includes a changeover switch that decides the cut-off of a power supply. A sequential controlling circuit 101 actuates load controlling circuits 103 and 104 by the input information of the switch 100 and controls a load 105. When a changeover switch is pushed, the circuit 101 cuts off the conduction to the circuit 103 containing no relay. Then the output of a timer 102 connected to the switch 100 is applied to the circuit 101 after a certain time of the timer 102 elapses. As a result, the conduction is cut off to the circuit 104 containing a relay. This prevents the fault of a contact due to spark discharge.

Description

[Detailed description of the invention] The present invention relates to a control circuit for a washing machine or the like.

In a fully automatic washing machine that has an input setting switch that modifies the washing course and an off switch, and also has a relay contact that self-holds the power when the input setting switch is pressed, the off switch is used while controlling the load of the motor, etc. If pressing immediately shuts off all power, the relay contacts may open and close while energized, and there may be several spark discharges at the contacts. Therefore, relay contacts may suffer from failures such as welding.

Of course, the same applies when the rotation of the motor is performed by a relay and the energization time is determined by a bidirectional switching element. Therefore, an object of the present invention is to solve such inconveniences at low cost.

That is, the power to the relay contacts is cut off after all other load controls are cut off, thereby eliminating spark discharge at the contacts and eliminating contact failures.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the basic configuration of the present invention. 100 is an input setting switch including an off switch for determining power cutoff, 1o1
1o2 is a sequential control circuit, and 1o2 is a timer that elapses a certain period of time after the cut-off switch is pressed. Input setting switch 100
Based on the input information, the sequential control circuit 101 operates the load control circuits 103 and 104 to control the load 106. However, if the cut-off switch is pressed, the sequential control circuit 101 cuts off the power to the load control circuit 1o3 that does not include the relay. After the timer 102 connected to the input setting switch 100 has elapsed for a certain period of time, its output is input to the sequential control circuit 101, and as a result, the power supply to 104 consisting of L/- is cut off.

FIG. 2 shows an embodiment of the present invention.

200 is a commercial power source, and 201 is a power holding switch.

When the power holding switch 201 is closed, the transformer 202 is energized, and as a result, it is rectified by the full-wave rectifier 203, and is passed through the diode 204 to the electrolytic capacitor 206.
The voltage is smoothed by the constant voltage circuit 206, and the voltage is made constant by the constant voltage circuit 206, and the power is supplied to the microcomputer 207.

When the microcomputer is supplied with power, it energizes the coil 209 of the relay via the driver 208. When the relay coil 209 is energized, the relay contacts 21
0 is closed, and commercial power is then supplied to the control system via the contact 210.

Reference numerals 211 to 214 designate a set of input setting switches for setting predetermined operations, each of which is input to the microcomputer 207 via pre-down resistors 216 to 219. 211 includes, for example, a fully automatic course that executes all processes from washing to spin-drying, a wash-only course that carries out only washing, a wash and rinse course that carries out washing and rinsing, a rinse and spin-drying course that carries out everything from rinsing to spin-drying, and spin-only course. This is a manual setting switch that selects the dehydration course. In this example, the microcomputer 207 counts the number of times 211 is pressed, and selects and stores a course corresponding to the counted number according to instructions from an internal storage section. 2
12 and 213 are input setting switches for determining washing time, spin-drying time, number of rinses, etc., 212 is called a standard course switch, and 213 is called a saving course switch. Both switches are input to the microcomputer 207 via resistors 217 and 218, and which one of them is set to input is stored.

When settings are made using the input setting switches 211, 212, and 213, the microcomputer 207 uses the display LICDs 226 to 2 via the drivers 221 to 226.
30 is operated, and a display corresponding to the course set and stored by the input setting switches 211 to 213 is displayed. Now 226 is washing, 227 rinsing, 228 dehydration, 229
Standard, corresponds to '230 savings. For example, if the fully automatic course and the standard course are selected, LKD22
6 to 228 and 229 are turned on, and if the saving course is selected in the fully automatic course, L]ED226 to 228 and 230 are turned on. 231 to 236 are the above LKD22
6 to 230 resistance for flow reduction.

When the setting is completed, the microcomputer 207
The courses set in steps 1 to 213 are executed according to instructions stored in the storage section stored in advance. If the standard course is set in the commanded automatic course, the LRD 226 corresponding to the washing is blinked, and the driver 236. Bidirectional semiconductor switching element 23B via resistor 237
and operate the water supply valve 239 connected to it,
Start water supply. When the water level reaches a certain level, the water level switch 24
0 is closed, and the information is input to the microcomputer 207 via the resistor 241. When this information is input, the microcomputer 207 stops energizing the water supply valve 239 according to instructions from the storage unit, and the Drino Z-24
2,243, a motor 249 via resistors 246, 246 and bidirectional semiconductor switching elements 247, 248. Here, 260 is a capacitor for the motor.

The microcomputer 207 inputs and counts the commercial power supply voltage waveform shaped by the resistors 247 and 248 and the TTLAND gate 249 as a time reference. The internal timer created by recurrent time based on this time limit is compared with the washing time (stored in the storage section) selected in advance by the input setting switch, and the washing process is performed until they match or the count reaches a certain value.

When the value of the timer provided inside the microcomputer becomes greater than the washing time selected in advance and stored in the memory section, the microcomputer stops energizing the motor, turns off the LKD226, completes the washing process, and rinses. Perform the process. When entering the rinsing process, LKD227 flashes. Then, in order to drain the water in the tank, the driver 243. resistance 24
The drainage magnet 264 is controlled via the 61 bidirectional semiconductor switching element 253, and drainage ends when the water in the tank runs out. When the drainage is completed, the drainage magnet and motor are operated to perform dewatering for a certain period of time, and then water is supplied and the motor is controlled to perform rinsing. The preset time is compared with the value of an internal timer, and when the timer value is equal to the value, the first rinse is completed. These operations are performed according to instructions from a storage section provided in the microcomputer.

Washing and rinsing with Sokuchi Micro Combita.

The progress of the dehydration process is memorized, and the progress of each process is also memorized. For example, if washing is in progress, the progress status is memorized to determine whether water is being supplied or washing is in progress, and if rinsing is in progress, the progress status of draining, spin-drying, water supply, rinsing, and whether it is the first rinse is stored. The state is memorized to determine whether it is the second rinse. Then, the process is executed while comparing the course selected by input settings with the progress memory. In the standard course, the above-mentioned series of rinses are performed twice.
After repeating the process, a dehydration process is performed. LK in the dehydration process
After turning off the D228 and blinking the LKD229, the drain magnet is controlled to drain the water, and then the motor is further controlled to start the dewatering operation.

When the value of the internal timer counts for a predetermined time or more, the power supply to the motor and magnet is stopped, dehydration is completed, and LE022E3 is turned off. and driver 2
After sounding the buzzer 256 via the relay coil 66, the relay coil 209 is de-energized and the power is cut off. Now, if the water is not drained and the water level switch 240 does not open even after a certain period of time has passed during draining, it is determined that the drain is defective, and further operations are stopped.

Further, when the unbalance detection switch 267 for detecting the unbalance of the dewatering cloth is operated, an input is received via the resistor 268, and the following operation is stopped as an unbalance defect. When a drainage defect or an unbalance defect occurs, the buzzer 266 is sounded, the voice synthesis means 268 is operated, and the speaker 269 is used to notify the defect at a fixed time or every fixed time. 260 is a lid switch that detects opening and closing of the lid, and is inputted to the microcomputer via a resistor 261. Returning to the original operation from the defective state is performed based on the information of the lid switch. That is, when the lid is opened or closed, predetermined operations after the occurrence of the defect are executed. At this time, when the lid is opened to recover from the defective state, the voice synthesis means is activated to notify the user of the defect contents, and the user is asked to perform an inspection based on the instructions, and after removing the cause of the defect, the lid is opened. If you close it, the original operation will continue. 262 is a pair of electrodes provided in the water supply path, 253 to 266 are resistors, and 266 is a comparator, which are input to the microcomputer 207. If water is not being supplied even though the water supply process has started, the resistance value between the electrodes will be large, and therefore the non-inverting input of the comparator will be higher than the inverting input that provides the comparator's comparison standard.
The output becomes HIGH due to the resistor 267. If the output of the comparator remains HIGH even after a certain period of time has elapsed after the start of the water supply process, the voice synthesis means is operated.1. A warning is issued to encourage people to check the opening and closing of water taps connected to the water supply route or beyond.

The setting input switch 214 is a cut-off switch for stopping all operations and cutting off the power, and is input to the microcomputer via a resistor 219. When this switch is pressed, electricity to the motor, water supply valve, drain magnet, etc. is stopped, and a second timer provided in the microcomputer is activated to cut off the power after a certain period of time.

268 is a capacitor that stops the operation of the microcomputer when the power supply to the microcomputer is unstable and constitutes a reset circuit, 269 is a resistor, and 200 is a capacitor.
These form part of the circuit that generates the clock for the microcomputer.

If the input setting switch is changed during current operation, the new course content selected by the input setting switch is stored in the storage section of the microcomputer. Instructions for washing, rinsing, and spin-drying, washing time, number of rinses, and spin-drying time are stored as course data. On the other hand, as mentioned above, the storage section within the microcomputer also stores the current progress state. When the input setting switch is changed and a course change is made, the new course data is compared with the progress state memory, and the washing, rinsing, and spin-drying steps are compared first, and the steps that have already been performed are ignored. Ru. The results are then stored in the storage section and the following execution instructions are given. In addition, in the case of washing or spin-drying, each newly set time is compared with the time that has already passed, and if the elapsed time is the same or greater than the set time, the next process is started, so for example, a new If the set time is shorter than the elapsed time, the process will proceed to the next step, and if it is longer than the elapsed time, washing or spin-drying will be performed for a time equal to the difference between the already elapsed time and the newly set time.

Regarding rinsing, the set number of times of rinsing is compared with the number of times of rinsing in the progressed state, and if the new set number of times is less than the number of times of progress, the process moves to the next step.

When moving on to the next process, the progress memory of washing, rinsing, and spin-drying is normally cleared, but when moving to the next process of spin-drying during draining and spin-drying, the progress memory and elapsed time of the timer are cleared. remains as data and moves on to the dehydration process.

Therefore, if you are draining during the second rinse with the standard setting, if you change it to save, the savings will only be in one rinse, so you will move on to the next step, dewatering, but the drain time that has already been executed will be reduced. Memory is not cleared, so draining during dehydration will only take place for as long as necessary.

An example of implementing the present invention in a fully automatic washing machine has been described above in the explanation of the operation of the automatic washing machine. After a certain period of time after cutting off the power to the IJ, the relay is activated to cut off the power to all the circuits, protecting the IJ l, z = contacts at a low cost, and is highly effective in further increasing the safety of the system.

[Brief explanation of the drawing]

FIG. 1 is a system block diagram of a control circuit in one embodiment of the present invention, and FIG. 2 is a circuit diagram of the same. 1oo... Input setting switch, 101...
...Sequential control circuit, 102...Timer, 103
, 104...Load control circuit, 10B...
··load. Name of agent: Patent attorney Toshio Nakao and 1 other person [1
Figure D3

Claims (1)

[Claims] A set of input setting switches that enable modification of the order including switches that decide to stop the operation and cut off the power, a sequential control circuit that takes the input setting switches as input, and a control circuit that is controlled by this sequential control circuit to maintain the power supply. at least one set includes a load control circuit formed by connecting a bidirectional semiconductor switching element and a relay in series, and a timer connected to the internal force setting switch; The sequential control circuit is operated by the operation of the switch that determines stoppage and power cutoff, and the power supply to the load control circuits other than the relay is stopped, and the timer is driven, and after a certain period of time, the relay is turned off. A control circuit that stops energization.