JP2017131468A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine which can suppress fusion of a fuse resistor by an operation of power supply relays for turning on/off power feeding from a commercial power supply.SOLUTION: A washing machine includes: a washing tub for accommodating clothing; an outer tub for including the washing tub; an outer frame for mounting these; an operation part mounted on the outer frame; and a control board of load for making a washing function valid. Two power supply relays 22, 23 for performing power feeding to the control board from a commercial power supply are controlled by one control signal from a microcomputer 21, and an adjusting circuit 24 for an operation of a relay contact is provided between one power supply relay 23 and the microcomputer 21. With this constitution, the power supply relays 22, 23 are operated at different operation timing, and a rush current due to simultaneous ON can be prevented.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a washing machine and relates to a method for controlling a power relay.

  The control board of a washing machine is connected to a commercial power source using a general-purpose relay. By controlling the opening and closing of the contact of the general-purpose relay, the power supply from the commercial power source to the washing machine is turned on / off. It is common (for example, Unexamined-Japanese-Patent No. 2006-197738).

JP 2006-197738 A

  In the conventional method described above, the operations of the two general-purpose relays that turn on / off the power supply from the commercial power supply are determined by control signals from the microcomputer to the respective general-purpose relays.

  Therefore, if a control signal that opens the contact is input to the general-purpose relay connected in parallel with the fuse resistor for some reason during the process operation of the washing machine, a load current flows through the fuse resistor. In some cases, the fuse resistance was blown.

  An object of the present invention is to provide an easy-to-use washing machine that suppresses fusing of a fuse resistor with a simple configuration.

  A washing tub containing clothes, an outer tub containing the washing tub, a power switch for operating on / off of the power source, a first power relay and a second power relay for connecting a commercial power source and a control board, In accordance with the operation of the power switch, the first power relay is controlled by controlling the first power relay and the second power relay by a control unit that controls opening and closing of the power relay contact and one control signal from the control unit. A relay operation adjusting unit that shifts the timing of the operation of the second power relay relative to the operation of the second power relay.

  According to the present invention, it is possible to provide a washing machine that is easy to use by suppressing fusing of the fuse resistor with a simple configuration.

It is a vertical side view of the fully automatic washing machine which concerns on the Example of this invention. It is the figure which expanded the operation panel of the fully automatic washing machine which concerns on the Example of this invention. It is a block diagram of a control system concerning the example of the present invention. 1 is a circuit diagram of a relay contact holding circuit according to Embodiment 1 of the present invention. It is a circuit diagram of the relay contact holding circuit according to Example 2 of the present invention.

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

  The electric washing machine according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal side view of the electric washing machine of this embodiment, and FIG. 2 is an electric circuit diagram of the control device.

  An outer tub 3 is installed inside the outer frame 1 of the electric washing machine, supported by a plurality of suspensions 2, and a washing tub 4 serving as a washing and dehydrating tub is rotatably installed in the outer tub 3. A stirring blade 5 is rotatably installed at the bottom of 4. The washing tub 4 and the agitation blade 5 are connected to the inner end of a concentric double shaft passing through the outer tub 3 and are configured to be rotated by the motor of the main drive device 6 attached to the outside of the outer tub 3. To do.

  Although not shown in the figure, the main drive device 6 incorporates a DC brushless motor, a clutch mechanism, and a reduction gear mechanism, and drives the stirring blade 5 at a slow speed while the washing tub 4 is stationary in the washing and drying processes. In the dehydration process, the washing tub 4 and the agitating blade 5 are configured to form a drive system that integrally rotates at high speed.

  A top cover 7 having a garment input port 7 a is fixed to the upper end of the outer frame 1, and the garment input port 7 a is covered with an outer lid 8 so as to be opened and closed. An operation board 9, a control board 10, and a water level sensor 11 having an instruction input switch group and a display element group are housed in the front part of the top cover 7, and a water supply electromagnetic valve 12 and a bath water supply pump (illustrated) are provided in the rear part. (Omitted).

  An air trap 3 a provided at the lower portion of the outer tub 3 is connected to the water level sensor 11 via an air tube 13, and the drain port 3 b is connected to a drain hose 15 via a drain electromagnetic valve 14. Further, when an electric washing machine with a drying function is formed, an exhaust port is formed in the bottom side wall of the outer tub 3, the air in the outer tub is sucked out by an air circulation fan, cooled and dehumidified, and then heated to be above the washing tub 4. A dry air circulation system (not shown) that blows into the washing tub 4 is configured. In this embodiment, a fully automatic washing machine will be described, but it should be understood that a machine having a drying function may be used.

  As shown in FIGS. 2 and 3, the operation board 9 includes a power switch 16, an operation switch 17, a display unit 18, and the like. Here, the operation switch 17 is a button for appropriately selecting the operation content such as a careful course and a blanket course, and a button for appropriately changing the washing time, the number of times of rinsing, and the like. The power switch 16 is a button for starting the supply of power to the control board 10 of the washing machine.

  When the power switch 16 is pressed, the control board 10 is connected to a commercial power supply via the power switch 16 and the fuse resistor 19, and the internal power circuit 17 starts to supply power. When the internal power supply circuit 20 starts to supply power, the microcomputer 22 starts operating, the contact of the power supply relay 22 is closed, and the connection with the commercial power supply is continued without going through the power switch 16. Thereafter, the power supply relay 23 is closed and connected to the commercial power supply without going through the fuse resistor 19.

  When the power switch 16 is operated from the outside after the washing machine process is completed or during the operation, control is performed to open the contact of the power relay during the power-off process. Also, when the power supply from the outlet is interrupted due to a power failure or the like, the power-off process is performed in the same way.

  A power supply relay 23 wired in parallel with the microcomputer 21, one power supply relay 22 and the fuse resistor 19 is wired with one output terminal of the microcomputer 21, and relay operation adjustment is performed between the microcomputer 21 and the power supply relay 23. A circuit 24 is arranged. The relay operation adjustment circuit 24 includes a resistor 25 and a capacitor 26 as shown in FIG. The microcomputer 21 starts to operate by operating the power switch 16, and the microcomputer 21 outputs a control signal to close the power relay 22 and the power relay 23, but is applied to the coil of the power relay 23 by the relay operation adjusting circuit 24. The voltage to be applied to the coil of the power supply relay 22 is determined by the voltage charged in the capacitor 26 via the resistor 25, and is applied with a delay corresponding to the charging time of the capacitor 26.

  Therefore, the power supply relay 22 and the power supply relay 23 are not simultaneously turned on by a control signal from the microcomputer 21 and can be charged through the fuse resistor, thereby preventing an inrush current.

  In the second embodiment, a comparator 27 is disposed between the relay operation adjustment circuit 24 and the relay coil as shown in FIG.

  The comparison 27 compares the voltage of the capacitor 26 with the reference voltage, and is configured to invert the output when the voltage of the capacitor 26 becomes higher than the reference voltage.

  In this way, the delay time determined by the resistor 25 and the capacitor 26 of the relay operation adjusting circuit 24 can be adjusted in accordance with the reference voltage of the comparator, and the delay time can be easily adjusted.

  DESCRIPTION OF SYMBOLS 1 Outer frame, 2 Suspension, 3 Outer tub, 3a Air trap, 3b Drain port, 4 Washing tub, 5 Stirring blade, 6 Main drive device, 7 Top cover, 7a Clothes input port, 8 Outer lid, 9 Operation board, 10 Control board, 11 Water level sensor, 12 Water supply solenoid valve, 13 Air tube, 14 Drainage solenoid valve, 15 Drainage hose, 16 Power switch, 17 Operation switch, 18 Display section, 19 Fuse resistor, 20 Internal power supply circuit, 21 Microcomputer, 22 Power Relay 1, 23 Power Relay 2, 24 Relay Operation Adjustment Circuit, 25 Resistor, 26 Capacitor, 27 Comparator

Claims (3)

A washing tub for storing clothes;
An outer tub containing this washing tub;
A power switch for turning the power on and off,
A first power relay and a second power relay connecting the commercial power source and the control board;
In accordance with the operation of the power switch, a control unit that controls the opening and closing of the power relay contact;
Relay operation for controlling the first power relay and the second power relay by one control signal from the control unit and shifting the timing of the operation of the first power relay with respect to the operation of the second power relay A washing machine comprising: an adjustment unit; The washing machine according to claim 1,
The washing machine according to claim 1, wherein the relay operation adjusting unit includes a resistor and a capacitor. The washing machine according to claim 1,
A washing machine comprising a comparator between the relay operation adjusting unit and the relay coil of the second power relay.

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