JP2017131469A - Washing machine and washing-drying machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine or a washing and drying machine in which erroneous start of a power supply circuit due to induced voltage generating from a motor, is prevented irrespective of the characteristics of a power supply IC.SOLUTION: The washing machine and the washing-drying machine are provided each of which comprises a washing tub for washing laundry and a motor 19 for rotating the washing tub. Each of the washing machine and the washing-drying machine further comprises: a smoothing circuit 52 for smoothing a commercial power supply 51; an inverter circuit 54 for receiving a direct current voltage from the smoothing circuit 52 and supplying the voltage to the motor 19; a control circuit for 57 for controlling the operation of the washing machine and the washing-drying machine and the inverter circuit 54; a power supply circuit 55 for outputting a power supply voltage of the control circuit 57 by using the commercial power supply 51; and a separating circuit 53 for connecting and separating the inverter circuit 54 and the power supply circuit 55 to and from each other. Since an induced voltage of the motor 19 is not applied to the power supply circuit 55, erroneous start of the power supply circuit 55 can be suppressed.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a domestic washing machine and a washing and drying machine.

  Conventionally, a washing machine and a washing / drying machine are provided with a washing tub that is rotatably installed in an outer tub, a washing wing that is rotatably installed at the bottom of the washing tub, and a conductive drive device that rotationally drives the washing tub and the washing wing. The washing tub and washing wings are selectively driven to rotate by means of clutch switching by means of a conductive drive device, so that the laundry in the washing tub is agitated to perform the washing process and the rinsing process. It is the structure which spins and spins laundry.

  The conductive drive device is configured to supply voltage to an electric motor by an inverter circuit, and uses a DC brushless motor as the electric motor, so that various washing and dehydrating operations can be realized. Is proposed in Patent Document 1. Further, Patent Document 2 discloses a circuit configuration in which a DC brushless motor and a power supply circuit that outputs a power supply voltage of a control circuit of a washing machine are connected.

JP 9-121584 A JP 2001-46782 A

  However, in recent years, power supply ICs used in circuits for controlling the operation of washing machines and washing dryers and power supply circuits for outputting power supply voltages for driving loads have been improved in performance as the loss has been reduced. A power supply IC that can be activated has been proposed. For this reason, the power supply circuit can be started at a voltage lower than the conventional starting voltage. On the other hand, the induced voltage generated when the motor rotates is applied to the power supply circuit via the inverter circuit and the smoothing circuit. Conventionally, the induced voltage generated when the motor rotates is the starting voltage of the power circuit. Therefore, the power supply circuit was not erroneously started by the induced voltage of the motor. However, in the case of a power circuit using a power IC as described above, the starting voltage of the power circuit tends to be lower than the conventional voltage, and the induced voltage of the motor may reach the starting voltage of the power circuit. In this case, there is a problem that the power supply circuit may be erroneously started.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a washing machine and a washing / drying machine in which a power supply circuit is not erroneously activated by an induced voltage generated from a motor regardless of the characteristics of the power supply IC. .

  In order to solve the conventional problems, the present invention provides a washing tub for washing laundry, a washing circuit having a motor for rotating the washing tub, and a washing / drying machine having a smoothing circuit for smoothing a commercial power source. An inverter circuit which receives a DC voltage from the smoothing circuit and supplies the DC voltage to the motor, a control circuit which controls the operation of the washing machine and the washing / drying machine and the inverter circuit, and the control circuit using the commercial power source And a separation circuit that connects and separates the inverter circuit and the power supply circuit.

  According to the present invention, the induced voltage of the motor is prevented from being applied to the power supply circuit, and the power supply circuit is prevented from being erroneously started up by the induced voltage of the motor regardless of the characteristics of the power supply IC. It becomes possible to provide.

Longitudinal section of washing machine Conventional block diagram of control board configuration 1 Conventional block diagram of control board configuration when motor induced voltage is generated 1 Circuit block diagram of control board configuration 1 Circuit block diagram of control board configuration 2 Circuit block diagram of control board configuration 3 Circuit block diagram of control board configuration 4

  Examples of the present invention will be described below. FIG. 1 is a longitudinal sectional view of a washing machine showing an embodiment of the present invention. In this embodiment, an outline of a fully automatic washing machine is shown as an example of a washing machine.

  In the longitudinal sectional view of the washing machine shown in FIG. 1, the washing machine includes a washing machine outer frame 1, an outer frame base 2 that supports the washing machine outer frame 1 from below, and a top cover provided on the washing machine outer frame 1. 3. A lid 4 provided on the top cover 3 so as to be freely opened and closed is provided. The outer tub 5 is supported in a vibration-proof manner via a vibration-proof spring 21 on a hanging rod 7 that hangs down from a corner support portion 8 provided inside the washing machine outer frame 1.

  The washing tub 9 is rotatably placed in the outer tub 5. A DC brushless motor as the motor 19 is provided on the bottom side lower surface of the outer tub 5. The motor 19 is firmly attached to the outer tub 5 using the flange 20. The rotation main shaft 33 of the motor 19 is fixed to the bottom flange 39 of the washing tub 9 and supports the washing tub 9.

  At the center of the rotation main shaft 33, an inner rotation shaft (not shown) for rotating the washing wing 11 placed in the washing tub 9 so as to be rotatable left and right is provided.

  The motor 19 can switch the rotation operation of the washing tub 9 and the washing blade 11 by a switching means (not shown) by the clutch 31.

  In washing the laundry 38, the motor 19 rotates left and right, and the washing blade 11 also rotates left and right, and the laundry 38 is agitated.

  In the dehydration of the laundry 38, the motor 19 rotates at high speed, the washing tub 9 also rotates at high speed, and centrifugal dehydration is performed from the dewatering holes 12 provided in the body of the washing tub 9.

  The drainage electromagnetic valve 22 is provided in a drainage hose 23 that communicates with a drainage port provided at the bottom of the outer tub 5. Water used for washing and rinsing is drained outside the machine through the drainage hose 23 when the drainage solenoid valve 22 is opened. The dehydration operation in which dehydration is performed is performed with the drain electromagnetic valve 22 open.

  The control board 27 is provided on the rear side (not shown) of the top cover 3. The power switch 40 is provided on the front side of the top cover 3. The power switch 40 is turned on, and various input switches provided on the display board 36 are operated to set the operation of the washing machine.

  The water level of the washing water stored in the outer tub 5 is detected by the water level sensor 41 due to a change in water pressure, and the water level information is provided to the control board 27 to control water supply and drainage.

  The drain electromagnetic valve 22 is provided in a drain hose 23 that communicates with a drain port 22 a provided at the bottom of the outer tub 5. Water used for washing and rinsing is drained outside the machine through the drainage hose 23 when the drainage solenoid valve 22 is opened.

  The dehydration operation in which dehydration is performed is performed with the drain electromagnetic valve 22 open. The control board 27 controls opening / closing of the drain electromagnetic valve 22, operation / stop of the motor 19, and speed adjustment.

  2 and 3 exemplify conventional configuration examples of the control board 27 and peripheral components.

  A circuit for controlling the operation of the motor 19 is mounted on the control board 27. First, when the power switch 40 is ON, the smoothing circuit 52 smoothes the voltage supplied from the commercial power supply 51 into a voltage for driving the motor 19, and the smoothed voltage is supplied to the inverter circuit 54. On the other hand, the power supply circuit 55 is activated when a voltage is supplied from the commercial power supply 51 and outputs the voltage to the control circuit 57 for controlling the inverter circuit 54. The control circuit 57 supplied with the voltage from the power supply circuit controls the inverter circuit 54 to supply the voltage to the motor 19 and rotate the motor. However, as shown in FIG. 3, when the power switch 40 is OFF, the commercial power source 51 is not supplied, and the induced voltage generated by rotating the motor 19 passes through the inverter circuit 54 and the smoothing circuit 52. Applied to the power supply circuit 55. On the other hand, since the performance of the power supply IC 56 used in the power supply circuit 55 has improved as the loss is reduced, a power supply IC 56 that can be started at a lower voltage has been proposed, and the power supply circuit 55 can be started at a lower voltage. It has become. Therefore, there is a possibility that the induced voltage generated from the motor 19 may reach the starting voltage of the power supply circuit 55 and the power supply circuit 55 is erroneously started.

  As an example of this embodiment, the circuit configuration of the control board 27 and peripheral components will be described with reference to FIG.

  First, when the power switch 40 is ON, the smoothing circuit 52 smoothes the voltage supplied from the commercial power supply 51 into a voltage for driving the motor 19. The smoothed voltage is supplied to the inverter circuit 54. Here, a separation circuit 53 is disposed between the smoothing circuit 52 and the power supply circuit 55. When the power switch 40 is OFF, the commercial power supply 51 is not supplied, and the induced voltage generated when the motor 19 is rotated is applied to the inverter circuit 54 and the smoothing circuit 52 by the separation circuit 53. By separating the smoothing circuit 52 and the power supply circuit 55 by the separation circuit 53, the power supply circuit 55 is not supplied and erroneous start-up is suppressed. Control of separation and connection of separation circuit 53 is performed by control circuit 57. FIG. 5 shows a circuit configuration in which the separation and connection of the separation circuit 53 are controlled according to whether or not the drive voltage is supplied to the separation circuit 53 of the power supply circuit 55.

  As yet another example, FIG. 6 shows a circuit configuration in which the voltage supplied to the power supply circuit 55 is the voltage smoothed by the smoothing circuit 52. 4 and 5, when the power switch 40 is OFF, the induced voltage generated when the motor 19 is rotated is generated by the separation circuit 53 disposed between the inverter circuit 54 and the power circuit 55. The induced voltage is not supplied to the power supply circuit 55, and erroneous start-up of the power supply circuit 55 is suppressed. Further, FIG. 7 shows a circuit configuration in which the separation and connection of the separation circuit 53 described above are controlled depending on whether or not the drive voltage is supplied to the separation circuit 53 of the power supply circuit 55.

  As a result, even if the induced voltage generated by the rotation of the motor 19 is not applied to the power supply circuit 55 and the power supply IC 56 whose performance has been improved along with the reduction in loss is used in the power supply circuit 55, the power supply circuit 55 is erroneously started. Therefore, it is possible to provide a highly safe washing machine.

Claims (3)

In a washing machine and a washing / drying machine having a washing tub for washing laundry and a motor for rotating the washing tub,
A smoothing circuit for smoothing commercial power,
An inverter circuit that receives a DC voltage from the smoothing circuit and supplies the DC voltage to the motor;
A control circuit for controlling the operation of the washing machine and the washing and drying machine and the inverter circuit;
A power supply circuit that outputs a power supply voltage of the control circuit using the commercial power supply;
A washing machine and a washing / drying machine comprising: a separation circuit that connects and separates the inverter circuit and the power supply circuit. In the washing machine and the washing dryer according to claim 1,
A washing machine and a washing / drying machine, wherein the connection and separation operations of the separation circuit are performed by the control circuit. In the washing machine and the washing dryer according to claim 1,
A washing machine and a washing / drying machine, wherein the separation circuit is connected and separated by the power supply circuit.

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