JP2015073755A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine capable of continuing an electric conduction state, even when a power supply voltage drops.SOLUTION: Electric conduction means 50 is configured of: a power supply switch 52; a first relay 51 connected in parallel with the power supply switch 52; and a second relay 53 which is connected in parallel with the power supply switch 52, which conducts electricity by the electric conduction of a coil for ON, and after the electric conduction, which retains the electric conduction even when the coil for ON is stopped, and which releases the electric conduction when electricity is conducted to the coil for OFF. When a power supply voltage detected by power source voltage detection means 56 drops lower than a first predetermined voltage, control means 87 conducts electricity to the coil for ON of the second relay 53 and brings it into an electric conduction state. Thus, even when the first relay 51 cannot retain an electric conduction state due to the drop of the power supply voltage, as the electric conduction passage to a washing machine is retained, excellent usability can be achieved.

Description

  The present invention relates to a washing machine that performs washing, rinsing, and dewatering processes.

  Conventionally, in this type of washing machine, when the power is cut off during operation, especially when a power failure occurs, the operation state at that time is stored in the non-volatile memory, and then when the power is restored, it is stored in the non-volatile memory. A configuration has been proposed in which the operation is restarted from the operation state when the power source is shut off based on the contents (for example, see Patent Document 1).

  FIG. 5 is a block circuit diagram of a conventional washing machine described in Patent Document 1, and FIG. 6 is a flowchart of the washing machine.

  5 and 6, when power is supplied to the control device 23, in step S1, a latch signal Sa is output to the transistor 27, and the ON coil 15C is energized to close the latching relay 15B. At this time, the latching relay 15B maintains the closed state.

  In step S2, the storage content of the nonvolatile memory 35 is read to determine whether the storage content remains. Here, when the previous washing operation is completed normally or when the power-off switch 16 is turned on during the previous washing operation, the parameter indicating that the stored content is zero is “0”. The determination in step S2 is “NO”, and the process proceeds to step S3. In step S3, the washing operation is started on the set course, and in step S4, the driving progress is sequentially stored at the set timing.

  In step S5, it is determined whether or not the washing operation has ended normally. If “NO”, the power-off switch 16 is turned on during the washing operation (the power-off command Sb is present) in step S6. Or not). If there is no power-off command Sb, the process returns to step S4.

  In step S6, if the washing operation ends normally or if there is a power-off command Sb, the process proceeds to step S7, the stored contents are cleared, and in step S8, the driving of each device is stopped. In S9, the latch release signal Sc is output to the transistor 29 and the off coil 15D is energized. Thus, the latching relay 15B is opened, and all devices including the control device 23 are disconnected.

  Here, if there is a power failure during the washing operation, power is not supplied to the control device 23 and other devices at that time, and the control of the control device 23 is stopped. Then, the stored contents at the time of the power failure remain in the nonvolatile memory 35. In addition, when this power failure occurs, the latching relay 15B remains closed.

  When the power failure is restored, the latching relay 15B is maintained in the closed state, so that the commercial power supply is supplied to the control power supply circuit 25. By supplying power to the control device 23, the control is started as shown in FIG. In this case, in step S1, the ON coil 15C is uniquely energized, but the latching relay 15B maintains the closed state. In the determination process of step S2, since it is determined that the stored contents of the nonvolatile memory 35 remain, the process proceeds to step S10, and a power failure indicator (not shown) on the operation panel (not shown). In step S11, it is determined whether or not the washing machine lid (not shown) is closed based on the output of the washing machine lid opening / closing sensor 32. If the washing machine lid is closed, the process proceeds to step S12. The operation is resumed according to the stored contents.

  In step S11, when it is determined that the washing machine lid is open, the process proceeds to step S13 to display a prompt to close the washing machine lid on an appropriate display and wait for the user to close the lid.

Japanese Patent No. 4987829

  However, in the conventional configuration, in order to automatically energize the device when power is restored after a power failure, it is necessary to maintain the relay ON state that maintains the current path at the time of the power failure. The power supply to the microcomputer could not be cut off, and the microcomputer could not be reset.

  In order to solve this problem, a latching relay is provided in parallel with the power supply relay, normally energized by the power supply relay, and when a power failure is detected, the latching relay is turned on, and during normal operation or from power failure It is conceivable that the microcomputer can be reset even if the microcomputer runs away by configuring the launching relay to be turned off when returning.

  However, at the time of a power failure, the voltage does not always become 0 V, and a case where a low voltage that does not turn on the latching relay is supplied is assumed. When such a power failure occurs, the control device 23 is in a state of continuing control of the load. The control device 23 has a capacitor that forms a DC power source in order to maintain its own operation. However, since the DC power stored in the capacitor flows to the load, the DC power source is consumed in a short time. The control device 23 is reset before the latching relay is turned on, and there is a problem that the washing operation cannot be automatically resumed even if the power failure is restored.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described conventional problems, and to provide a washing machine that can automatically resume a washing operation when a power failure is restored and has excellent usability.

  In order to solve the above-described conventional problems, the washing machine of the present invention includes a control unit that sequentially controls a series of processes such as washing, rinsing, dehydration, and drying, a power supply voltage detection unit that detects a voltage level of the power supply, An energizing unit provided between the power source and the control unit, and the energizing unit is connected in parallel with the power switch and the power switch, and is conducted by energizing the coil, and the coil is not energized. And a first relay that releases the conduction state, and is connected in parallel to the power switch, and conducts by energization of the on-coil. After the conduction, the conduction state is maintained, and when the off-coil is energized, the conduction state is established. A second relay to be released, and the control means energizes the ON coil of the second relay when the power supply voltage detected by the power supply voltage detection means falls below a first predetermined voltage. Shi Is obtained by a configuration in which the second relay conductive.

  Since the washing machine of the present invention can automatically resume the washing operation when the power failure is restored, excellent usability can be realized.

Side sectional view of the washing machine of the embodiment of the present invention Block diagram of the washing machine Flowchart explaining the washing operation of the washing machine Flow chart explaining operation at the time of power supply voltage drop of the washing machine Block diagram of a conventional washing machine Flow chart explaining operation of the washing machine

  The first invention is provided between the power supply and the control means, a control means for sequentially controlling a series of processes such as washing, rinsing, dehydration and drying, a power supply voltage detection means for detecting the voltage level of the power supply, and the like. And a first relay that is connected in parallel with the power switch and that conducts when the coil is energized and releases the energized state when the coil is de-energized. A second relay connected in parallel to the power switch, conducting by energization of the on-coil, maintaining a conducting state after conduction, and releasing the conducting state when the off-coil is energized; When the power supply voltage detected by the power supply voltage detection means is lower than a first predetermined voltage, the control means energizes the on-coil of the second relay to bring the second relay into a conductive state. To do It is.

  With this configuration, even if the first relay can no longer maintain the conduction state due to a drop in the power supply voltage, it is possible to automatically resume the washing operation when the power is restored by maintaining the energization path to the washing machine. Therefore, it is possible to realize excellent usability.

  According to a second aspect of the invention, the control means is configured such that the power supply voltage detected by the power supply voltage detection means is lower than the first predetermined voltage and higher than a voltage capable of holding the first relay energized. In the case of lowering the current, the energization to the first relay is stopped.

  With this configuration, it is possible to prevent the first relay from being repeatedly turned on and off in a situation where the power supply voltage is unstable, and high safety can be exhibited.

  According to a third aspect of the present invention, the control means is configured so that the power supply voltage detected by the power supply voltage detection means is lower than the second predetermined voltage and the conduction of the first relay is released. When the voltage higher than the third predetermined voltage higher than the first predetermined voltage is detected, the first relay is energized.

  With this configuration, it is possible to prevent the first relay from being repeatedly turned on and off in a situation where the power supply voltage is unstable, and high safety can be exhibited.

  According to a fourth aspect of the present invention, the control unit includes a storage unit that stores an operation status, and the power supply voltage detected by the power supply voltage detection unit is lower than the second predetermined voltage, so that the first relay After the continuity is released, when the voltage higher than the third predetermined voltage higher than the first predetermined voltage is detected and the first relay is energized, the storage means The driving is resumed from the stored driving situation.

  With this configuration, the washing operation can be automatically restarted more reliably when the power failure is restored.

  Hereinafter, embodiments of the invention will be described with reference to the drawings. Further, the present invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a washing machine according to an embodiment of the present invention.

  In FIG. 1, the washing machine 100 includes a housing 110 in which a storage tub 200 is supported in a swinging manner so that the storage tub 200 can swing freely. The storage tub 200 includes a substantially cylindrical peripheral wall 211 that surrounds a rotation axis RX. 210 and a water tank 220 containing the rotary drum 210 rotatably.

  The casing 110 includes a front wall 111 in which an inlet for putting clothes into the storage tank 200 is formed, and a rear wall 112 opposite to the front wall 111. The rotating drum 210 and the water tank 220 are , Opening toward the front wall 111.

  A door body 120 is provided on the front wall 111 of the housing 110, and the door body 120 rotates between a closed position that closes the charging port formed in the front wall 111 and an open position that opens the charging port. It turns freely. The user turns the door body 120 to the open position, puts clothing into the rotary drum 210 through the insertion port of the front wall 111, moves the door body 120 to the closed position, and starts washing.

  The rotating drum 210 rotates around a rotation axis RX extending between the front wall 111 and the rear wall 112. The clothes put into the rotating drum 210 move in the rotating drum 210 as the rotating drum 210 rotates, and are subjected to washing, rinsing and / or dehydration processes. The rotating drum 210 has a bottomed cylindrical shape, and a bottom wall 212 is formed to face the door body 120 in the closed position.

  The water tank 220 includes a bottom 221 that surrounds a part of the bottom wall 212 and the peripheral wall 211 of the rotary drum 210, and a front part 222 that surrounds the other part of the peripheral wall 211 of the rotary drum 210 between the bottom 221 and the door body 120. have.

  A rotation shaft 230 is attached to the bottom wall 212 of the rotary drum 210 in the storage tank 200, and the rotation shaft 230 extends toward the rear wall 112 along the rotation axis RX, so that the bottom 221 of the water tank 220 is formed. It penetrates and extends between the water tank 220 and the rear wall 112.

  A motor 231 installed below the water tank 220 is connected to the rotating shaft 230 via a belt 233 and a pulley 232, and the rotary drum 210 is rotationally driven in the water tank 220 by the operation of the motor 231. .

  On the front side of the housing 110, a packing structure 130 is disposed between the front portion 222 of the water tank 220 and the door body 120, and the door body 120 rotated to the closed position is in contact with the packing structure 130. The packing structure 130 forms a watertight seal structure between the door 120 and the front portion 222.

  The housing 110 includes a housing top wall 113 that extends substantially horizontally between the front wall 111 and the rear wall 112, a housing bottom wall 114 that faces the housing top wall 113, and both side walls (not shown). Has been.

  A water supply valve 140 connected to a faucet (not shown) and a distribution unit 141 for distributing water introduced through the water supply valve 140 are provided on the upper portion of the housing 110. Is provided with a connection portion with a faucet on the housing top wall 113, and the distribution portion 141 is disposed between the housing top wall 113 and the storage tank 200.

  A drainage pump 74 and a circulation pump 330 are disposed at the lower part of the housing 110. The drain pump 74 drains the water in the water tank 220 to the outside when necessary, such as at the end of the washing process or at the end of the rinse process, and the circulation pump 330 uses the water in the water tank 220 as circulating water as needed. 220 is ejected into the rotary drum 210 from a jet port inside the front portion.

  At the bottom of the water tank 220, a warm water heater (heating means) 160 comprising a sheathed heater for heating the wash water is provided in the horizontal direction, and the wash water in the water tank 220 heated by the hot water heater 160 is supplied as described above. By discharging into the rotating drum 210, the washing water is supplied to the laundry, and the washing water in the water tank 220 is recirculated. Thereby, since heated washing water is supplied to the laundry, the molecular activity of the washing water is increased and the activation of the detergent is increased, so that the cleaning power can be improved and washing unevenness can be reduced.

  The selection of the mode such as the driving course and various functions is input to the input setting means 83 (see FIG. 2) by the user operating the operation display unit 85 provided at the upper front of the casing 110, and the casing 110 is selected. The control means 87 (see FIG. 2) of the control device 80 disposed in the upper part of the screen displays the selected content on the display means 84 (see FIG. 2) on the operation display unit 85 based on the input information. To inform the user.

  FIG. 2 is a block circuit diagram of the washing machine in the embodiment of the present invention.

  In FIG. 2, the current from the commercial power source 88 is DC rectified and smoothed by the rectifier diode 54 and the capacitor 55, and the capacitor 55 forms a first DC power source. Hereinafter, the first DC power supply 55 is referred to. In the first DC power supply 55, three set voltages are set from the first set voltage to the third set voltage, and the second set voltage is lower than the first set voltage, and The voltage is set higher than the voltage that can maintain the energized state of the power relay 51 described later. The third set voltage is set to a voltage higher than the first set voltage.

  The second DC power source 57 is a DC power source that is generated from the first DC power source and supplies power to the control means 87 and the load driving means 86.

  The control means 87 is constituted by a microcomputer or the like, and operates when electric power is supplied via the energization means 50. The motor 231 and the water supply valve are operated via the load driving means 86 constituted by a bidirectional thyristor, a relay and the like. 140, the operation of the drain pump 74, the circulation pump 330, the hot water heater 160, and the like are controlled, and a series of steps of washing, rinsing, and dewatering are sequentially controlled.

  The control unit 87 and the load driving unit 86 are operated by feeding from the second DC power source 57. Therefore, when the first DC power supply 55 drops to a voltage equal to or lower than a predetermined value due to a cause such as a drop in the voltage of the commercial power supply 88, the control means 87 and the load driving means 86 are output at the output voltage of the second DC power supply 57. Cannot be operated.

  The energization means 50 includes a power switch 52 formed of a normally open switch that turns on when pressed and turns off when released, a first relay 51 (hereinafter referred to as a power relay), and a second relay. 53 (hereinafter referred to as a latching relay) are connected in parallel. The power relay 51 closes the contact by energizing a coil (not shown) and becomes conductive, and when the coil is de-energized, the contact opens and the power is cut off. The contact of the latching relay 53 is closed by energization of the ON coil (not shown), and the contact is closed. After the contact is closed, the contact is mechanically closed even if the energization of the ON coil is lost. When the state is maintained and an off coil (not shown) is energized, the contact is closed and the energization is interrupted.

  The control means 87 is energized and activated by pressing the power switch 52, and after the control means 87 is activated, the power relay 51 is energized so that the user can release the pressure on the power switch 52. Is also maintained in a conductive state.

The power supply voltage detection means 56 divides the DC voltage of the capacitor 55 (hereinafter referred to as a first DC power supply) with a resistor and outputs the voltage information to the control means 87. In the present embodiment, the voltage of the first DC power supply 55 is divided so that it can be used by the control means 87 that operates by supplying power from the second DC power supply 57, and is equal to or lower than the voltage of the second DC power supply 57. The voltage is stepped down to a voltage and output to the control means 87.

  The zero cross detection means 321 zero-crosses a rectangular wave signal that receives an alternating current of the commercial power supply 88, passes the zero voltage through the zero cross point, and switches from the H signal to the L signal or from the L signal to the H signal when the polarity changes. The signal is output to the control means 87 as a signal. The control means 87 can determine that a power failure has occurred when the signal from the zero-cross detection means 321 stops entering.

  The storage means 426 is composed of a nonvolatile memory, and is composed of an EEPROM or the like, and stores the operation progress status, operation details, data necessary for a series of controls, and the like.

  The water level detection means 90 detects the water level in the water tank 220 and outputs it to the control means 87.

  The operation display unit 85 includes an input setting unit 83 and a display unit 84. The input setting unit 83 inputs a setting course necessary for the user, an operation start, and the like. When (not shown) is pressed, the control unit 87 releases the energized state by the energizing unit 50 and turns off the power. The display means 84 displays the setting contents by the input setting means 83, the operation state, the washing operation, the abnormal state of each part of the washing machine, and the like.

  The notification means 78 is constituted by a piezoelectric buzzer or the like, and performs a notification operation by the output of the control means 87.

  The hot water heater 160 heats the washing water in the water tank 220, the water supply valve 140 supplies water into the water tank 220, and the drain pump 74 drains the washing water in the water tank 220.

  In the washing process, the control means 87 detects the amount of laundry in the rotary drum 210 at the start of washing, then controls the water supply valve 140 to supply water into the water tank 220, and the hot water heater 160 performs washing in the water tank 220. While heating the water, the rotating drum 210 is rotated at a low speed by the motor 231 to stir the laundry. When the washing is completed, the drain pump 74 is driven to perform “rinsing”, and rinsing and intermediate dehydration are performed. The combination with is performed several times. In the intermediate dehydration, the rotary drum 210 is rotated at a high speed, and the laundry is dehydrated by centrifugation. In “dehydration” after “rinsing”, the laundry drum is centrifugally dehydrated by rotating the rotary drum 210 at a high speed as in the case of intermediate dehydration.

  About the washing machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  FIG. 3 is a flowchart for explaining the washing operation of the washing machine according to the embodiment of the present invention, and FIG. 4 is a flowchart for explaining the operation of the washing machine during a power failure.

  3 and 4, when power is supplied via the power switch 52 by the user turning on the power switch 52 or via the latching relay 53 by power supply voltage processing described later, the control means 87 is activated. (Step S100).

When the control means 87 is activated, the voltage of the first DC power supply 55 is detected in step S101, and if the detected voltage of the first DC power supply 55 is equal to or higher than the third predetermined voltage (Yes in step S101), step The process proceeds to S102. The detection is repeated until the detection voltage of the first DC power supply 55 becomes equal to or higher than the third predetermined voltage. The third predetermined voltage is for confirming that the voltage of the first DC power supply 55 is in a normal state, and the first to third predetermined voltages set in the first DC power supply 55. Of these, the highest voltage is set.

  In step S102, the power supply relay 51 is turned on. In this state, since the power supply relay 51 maintains a conductive state, power can be supplied to the control means 87 even if the user releases the power switch 52.

  In step S103, an off coil (not shown) of the latching relay 53 is turned on (for example, 50 ms). At this time, the latching relay 53 is turned off in the case of a return from a low voltage state described later.

  In step S104, the storage unit 426 which is a nonvolatile memory such as an EEPROM is read, and when the operation state is not stored in step S105 (No in step S105), Alternatively, after the user turns off the power switch 52, it is determined that the power has been turned on by the user, and waits until the start switch (not shown) of the input setting means 83 is turned on as an initial standby state. (Step S107).

  In step S107, when the start switch is turned on (Yes in step S107), each load such as the water supply valve 140 and the motor 231 is controlled, and a washing operation (step S108), a rinsing operation (step S109), and a dehydrating operation (step) S110) are sequentially executed. Although not shown in the flowchart, the progress of the operation is sequentially written in the storage unit 426 during each operation or at the end. In addition, before turning on a start switch by step S107, you may set a driving course, a water level, etc. by the input setting means 83. FIG. When the start switch is turned on without setting, the control means 87 automatically sets a standard operation course according to the amount of cloth loaded and starts operation.

  In step S105, when the operation state is stored in the storage unit 426 (Yes in step S105), it is a return from a power failure or a return from a low voltage state in which the operation is stopped due to a decrease in power supply voltage. The washing operation is restarted based on the operation state that has been determined and stored (step S106).

  During the execution of each process from step S108 to step S110, the input from the power supply voltage detection means 56 is constantly monitored, and the power supply voltage process shown in FIG. 4 described below is performed.

  In FIG. 4, when the process is started (step S200), if a low voltage detection flag indicating that a low voltage is detected by the power supply voltage detection means 56 is set in step S201, it is cleared.

  If the voltage of the first DC power supply 55 is equal to or lower than the first predetermined voltage lower than the third predetermined voltage in Step S202 (Yes in Step S202), the low voltage detection flag is set in Step S203.

  The first predetermined voltage is slightly lower than that when the voltage of the first DC power supply 55 is normal, but is higher than the voltage at which the control means 87 can be driven and the energized state of the power supply relay 51 can be maintained. Is set.

Next, in step S204, the loads such as the water supply valve 140 and the motor 231 are turned off. In step S205, the on coil (not shown) of the latching relay 53 is turned on, and the latching relay 53 is turned on (conductive). . By turning off each load in step S204, consumption of residual charges of the first DC power supply 55 can be suppressed, and more time is required for the program operation of the control means 87 and the ON operation of the latching relay 53. be able to.

  In step S206, when the voltage of the first DC power supply 55 is equal to or higher than the second predetermined voltage (No in step S206), the process returns to step S202. If the voltage is equal to or lower than the second predetermined voltage (Yes in step S206), the voltage is too low. Therefore, in step S207, the power supply relay 51 is turned off. In step S208, the process ends, and the process returns to step S101 shown in FIG. .

  The second predetermined voltage is set to a voltage lower than the first predetermined voltage and higher than a voltage that can maintain the energization state of the power supply relay 51. When the voltage of the first DC power supply 55 is unstable, a series of processing is repeated many times. As a result, the power supply relay 51 is repeatedly turned on and off. It will trigger. Therefore, this state can be avoided by setting the second predetermined voltage to a voltage lower than the first predetermined voltage and higher than a voltage capable of maintaining the energization state of the power supply relay 51.

  The third predetermined voltage is set to a voltage higher than the first predetermined voltage. This is because when the voltage of the first DC power supply 55 is unstable, a series of processing is repeated many times, and as a result, the power supply relay 51 and the latching relay 53 are repeatedly turned on and off. Failure of the power relay 51 and the latching relay 53 is induced. Therefore, this state can be avoided by setting the third predetermined voltage to a voltage higher than the first predetermined voltage.

  In step S202, when the voltage of the first DC power supply 55 is equal to or higher than the first predetermined voltage (No in step S202), it is confirmed in step S211 that the low voltage detection flag is set / cleared. In step S211 (Yes in step S211), the coil for turning off the latching relay 53 is turned on in step S212, the conduction state of the latching relay 53 is released, and the normal operation is resumed (step S213).

  In step S211, when the low voltage detection flag is not set (No in step S211), it can be determined that the state is normal, so the process is terminated and normal operation is continued as it is (step S213).

  The normal operation refers to a series of washing operations shown in steps S108 to S110 in FIG.

  Returning to FIG. 3, when the dehydrating operation is completed in step S <b> 110, the operation state stored in the storage unit 426 between step S <b> 108 to step S <b> 110 is cleared (step S <b> 111), and a series of washing operations are completed by the notification unit 78. This is notified (step S112).

  In step S112, after the completion notification is completed, when the power relay 51 is turned off (step S113), the energization path is interrupted, the control means 87 is stopped (step S114), and the entire washing machine 100 is stopped.

As described above, in the present embodiment, the energizing means 50 is connected in parallel with the power switch 52 of the input setting means 83 and the power switch 52, and is turned on when the coil is energized, and the coil is no longer energized. Connected in parallel to the first relay 51 (power relay) for canceling the continuity and the power switch 52, and is turned on by energization of the on-coil. Second relay 53 (which releases the continuity when the coil is energized.
The control means 87 is electrically connected to the ON coil of the second relay 53 when the power supply voltage detected by the power supply voltage detection means 56 is lower than the first predetermined voltage. By setting the state, even when the first relay 51 cannot maintain the conduction state due to a decrease in the power supply voltage, excellent usability can be realized by maintaining the energization path to the washing machine.

  In addition, the control means 87 has the power supply voltage detected by the power supply voltage detection means 56 lower than the first predetermined voltage and further lower than the second predetermined voltage higher than the voltage capable of holding the first relay. In such a case, the configuration in which energization to the first relay 51 is stopped can prevent the first relay 51 from being repeatedly turned on and off in a situation where the power supply voltage is unstable, and is highly safe. Can demonstrate its sexuality.

  In addition, the control unit 87 detects the third voltage higher than the first predetermined voltage after the power supply voltage detected by the power supply voltage detection unit 56 is lower than the second predetermined voltage and the first relay 51 is released from conduction. When it is detected that the voltage has risen to a voltage higher than the predetermined voltage of the first relay 51, the first relay 51 is turned on in a situation where the power supply voltage is unstable. Repeating off can be prevented and high safety can be exhibited.

  In the present embodiment, an example of a control device in a washing machine has been described. However, the present invention is not limited to a washing machine, and may be implemented in a washing dryer, a clothes dryer, a dishwasher, or the like.

  As described above, the washing machine according to the present invention can maintain the energization path to the washing machine even when the first relay (power relay) cannot maintain the conduction state due to the decrease in the power supply voltage. Therefore, it can be applied to other uses such as a washing machine, a washing dryer, a clothes dryer, and a dishwasher.

50 energizing means 51 first relay (power relay)
52 Power switch 53 Second relay (latching relay)
56 power supply voltage detection means 83 input setting means 84 display means 85 operation display section 87 control means 88 commercial power supply 110 housing 210 rotating drum 220 water tank 231 motor

Claims (4)

Control means for sequentially controlling a series of processes such as washing, rinsing, dehydration, and drying, power supply voltage detection means for detecting a voltage level of a power supply, and energization means provided between the power supply and the control means The energizing means is connected in parallel with the power switch, the first relay connected in parallel with the power switch, and released when the coil is de-energized, and in parallel with the power switch. Connected to the second relay, and is made conductive by energization of the on-coil, maintains a conductive state after conduction, and is released from the conductive state when the off-coil is energized. When the power supply voltage detected by the power supply voltage detection means is lower than the first predetermined voltage, the second relay is turned on by energizing the ON coil of the second relay.濯機. The control means detects when the power supply voltage detected by the power supply voltage detection means is lower than the first predetermined voltage and lower than a second predetermined voltage higher than a voltage capable of holding the first relay. The washing machine according to claim 1, wherein energization of the first relay is stopped. The control means detects the power supply voltage detected by the power supply voltage detection means from the first predetermined voltage after the power supply voltage is lowered from the second predetermined voltage and the first relay is released from conduction. The washing machine according to claim 1 or 2, wherein the first relay is energized when a voltage higher than a high third predetermined voltage is detected. The control means includes storage means for storing an operation status, and the power supply voltage detected by the power supply voltage detection means falls below the second predetermined voltage, and the conduction of the first relay is released. After that, when a voltage higher than the third predetermined voltage higher than the first predetermined voltage is detected and energization of the first relay is performed, the operation status stored in the storage means is The washing machine according to claim 1 or 2, wherein operation is resumed.

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