JP2016137088A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine which achieves energy saving by reducing standby power during power OFF time.SOLUTION: During a step operation time, a first relay 34 is switched to a noise filter 32 side, a second relay 31 is switched into a closed state, a third relay 35 is switched into an open state and a fourth relay 37 is switched into a closed state, and also, when a zero-cross detection circuit 24 detects power shutdown and the operation is stopped, the first relay 34 is switched to a circuit which bypasses the noise filter 32, the second relay 31 is switched into an open state, the third relay 35 is switched into a closed state and the fourth relay 37 is switched into an open state. Thereby, energy saving can be achieved by reducing standby power at the time of waiting for turning-on of power or recovering from power failure.SELECTED DRAWING: Figure 2

Description

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

  Conventionally, this type of washing machine has been proposed to adopt an inverter control in order to cope with the sophistication of the operation course content (see, for example, Patent Document 1).

  FIG. 6 is a block circuit diagram of a conventional washing machine described in Patent Document 1. In FIG.

  In FIG. 6, the AC power of the commercial power source 120 is rectified by the rectifier 121, and the motor 181 is rotationally driven by the inverter circuit 124 using the DC power smoothed by the smoothing circuit including the choke coil 122 and the smoothing capacitor 123 as the driving power. .

  Further, the control unit 131 controls the rotation of the motor 181 based on the operation instruction input from the input setting unit 135 and the monitoring information of the operation state detected by each detection unit, and the water supply valve 127 is controlled by the load drive unit 126. In addition to controlling the operations of the drain valve 128, the blower fan 112, and the heater 129, the display means 136 transmits a display signal so that the user can know the operating state and the control state.

  The motor 181 includes a stator having three-phase windings 107a, 107b, and 107c, and a rotor (not shown) having two-pole permanent magnets, and a DC brushless provided with three position detection elements 130a, 130b, and 130c. The rotation is controlled by a PWM control inverter circuit 124 configured as a motor and configured by switching elements 124a to 124f.

  The rotor position detection signals detected by the position detection elements 130a, 130b, and 130c are input to the control unit 131 configured by a microcomputer or the like. Based on this rotor position detection signal, the drive circuit 132 performs PWM control of the on / off states of the switching elements 124a to 124f, thereby controlling the energization of the three-phase windings 107a, 107b, and 107c of the stator to control the motor 181. Rotate at the required speed.

  The control unit 131 includes a rotation speed detection unit 133 to which detection outputs of the three position detection elements 130a, 130b, and 130c are input. The rotation speed detection unit 133 is any of the three position detection elements 130a, 130b, and 130c. The period is detected in response to the change in the state of the signal, and the rotation speed of the motor 181 is calculated from the period. The detection output of the rotation speed detection unit 133 of the motor 181 corresponds to the number of rotations of the drum 178.

  A signal from a water level sensor 141 that detects the water pressure in the water tank 182 is input to the control unit 131, and the water level detection unit 142 in the control unit 131 calculates the water level in the water tank.

  Further, the storage means 190 stores acceleration data, water level data, stroke data at the time of power-off, etc., and the notification means 191 gives an end notification at the end of the stroke, an abnormality notification when an abnormality occurs, etc. to the user. It is to inform.

JP2013-070920A

  However, in the conventional configuration, the power consumption of the line-to-line capacitor and the discharge resistor in the circuit is large, the control unit itself is increased in speed and power consumption, and the detection and driving peripheral circuits are provided. Due to the fact that there are more washing machines than inverter-type washing machines, there is a problem that standby power is large when the power is turned off or when a power failure is detected, when waiting for power on or power failure recovery.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a washing machine capable of realizing energy saving by reducing standby power when waiting for power-on or power failure recovery.

  In order to solve the conventional problem, the washing machine of the present invention is connected to an AC power source, two or more sets of rectifying and smoothing circuits having a rectifier and a capacitor, an inverter circuit connected to an output of the rectifying and smoothing circuit, An electric motor connected to the output of the inverter circuit, a control means for controlling operation, a voltage conversion circuit for converting the output of the rectifying and smoothing circuit into a DC voltage used by the control means, and a circuit switching means for switching the rectifying and smoothing circuit It is what has.

  The washing machine of the present invention is connected to an AC power source, connected to an output of the rectifying and smoothing circuit having a rectifier and two or more capacitors, an inverter circuit connected to the output of the rectifying and smoothing circuit, and the output of the inverter circuit. An electric motor; control means for controlling operation; a voltage conversion circuit for converting an output of the rectifying and smoothing circuit into a DC voltage used by the control means; and circuit switching means for switching a capacitor of the rectifying and smoothing circuit.

  As a result, the standby power when the power is turned off can be lowered while waiting for a power failure recovery or power-on input.

  The washing machine of the present invention can reduce standby power when the power is turned off while waiting for power failure recovery or power-on input, and energy saving can be achieved.

1 is a longitudinal sectional view of a washing machine according to Embodiment 1 of the present invention. Block diagram of the washing machine Flow chart showing operation of the washing machine Block circuit diagram of a washing machine in Embodiment 2 of the present invention Flow chart showing operation of the washing machine Block diagram of a conventional washing machine

  The first invention is an AC power supply, two or more rectifying and smoothing circuits having a rectifier and a capacitor, an inverter circuit connected to the output of the rectifying and smoothing circuit, an electric motor connected to the output of the inverter circuit, Control means for controlling the operation, a voltage conversion circuit for converting the output of the rectifying and smoothing circuit into a DC voltage used by the control means, and circuit switching means for switching the rectifying and smoothing circuit.

  Thereby, when the power is turned off or when a power failure is detected, standby power when the power is turned on or waiting for recovery from the power failure can be reduced to realize energy saving.

  A second invention is connected to an AC power supply, a rectifying and smoothing circuit having a rectifier and two or more capacitors, an inverter circuit connected to an output of the rectifying and smoothing circuit, an electric motor connected to an output of the inverter circuit, Control means for controlling the operation, a voltage conversion circuit for converting the output of the rectifying and smoothing circuit into a DC voltage used by the control means, and circuit switching means for switching the capacitor of the rectifying and smoothing circuit.

  Thereby, when the power is turned off or when a power failure is detected, standby power when the power is turned on or waiting for recovery from the power failure can be reduced to realize energy saving.

  Hereinafter, embodiments of the present 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 Embodiment 1 of the present invention.

  In FIG. 1, the casing 41 supports the outer tank 43 in a suspended vibration-proof manner by a plurality of suspensions 42 inside. The washing / dehydrating shaft 44 is hollow and has a biaxial structure. The washing and dewatering tank 45 has a number of dewatering holes (not shown) on the side wall, a fluid balancer 46 for vibration reduction at the upper part of the inner periphery, and a pulsator 47 for clothes agitation at the center bottom. Has been.

  An upper frame 40 is provided in the upper part of the housing 41, and an operation display unit 51 for performing various input settings and displaying the setting contents is provided in the front part of the upper frame 40. And the control apparatus 50 which has the control means 21 (refer FIG. 2) is accommodated inside the operation display part 51. FIG.

  The transmission mechanism 48 incorporates a reduction gear (not shown) during washing. A motor 49 driven by an inverter by the control device 50 is attached to the outer bottom of the outer tub 43, and rotates the pulsator 47 and the washing / dehydrating tub 45 through the transmission mechanism 48.

  FIG. 2 is a circuit block diagram of the washing machine according to Embodiment 1 of the present invention, and FIG. 3 is a flowchart showing the operation of the washing machine.

  2 and 3, when the washing, rinsing, and dehydrating operations are being performed, the control means 21 mounted on the control device 50 performs power-off detection means for detecting power-off and power-on recovery. When the signal from the zero cross detection circuit 24 which is the power recovery detection means to detect is interrupted and a power failure is detected (step S1), it is connected to the output side of the first rectification smoothing circuit 30 and the second rectification smoothing circuit 36. The energization of the motor 49 driven by the inverter circuit 22 is stopped (step S2), and information on the current process is written in a non-volatile memory (not shown) as a storage means (step S3). Then, for safety, the brake is applied (step S4), and when rotation stop is detected (Y in step S5), the sequence processing is once ended, and noise on the output side of the AC power supply 33 and the power line is removed. The first relay 34 that is a circuit switching means provided between the noise filter 32 and the noise filter 32 is switched to a circuit that bypasses the noise filter 32 (step S6), and the second relay 31 that is also a circuit switching means is opened. Then, the first rectifying / smoothing circuit 30 is turned off, the fourth relay 37 and the relay 39 of the circuit switching means are opened, the inverter circuit 22 and the sensor 38 are disconnected from the circuit, and the third relay 35 of the circuit switching means. Is closed and the second rectifying / smoothing circuit 36 is turned on (step S7).

Here, the rectifying / smoothing circuit is composed of a rectifier (diode) or a smoothing capacitor, and a large-capacity electrolytic capacitor for the inverter circuit having a large leakage current is used as the smoothing capacitor of the first rectifying / smoothing circuit 30. The second rectifying / smoothing circuit 36 is a circuit for turning off the power. The smoothing capacitor of this circuit uses a low ESR electrolytic capacitor having a small capacity and a small leakage current.

  That is, when a power failure is detected, the first rectifying / smoothing circuit 30 that uses a large-capacity smoothing capacitor is turned off, and the second rectifying / smoothing circuit 36 that uses a small-capacity smoothing capacitor is turned on. The standby power while waiting for recovery can be reduced as much as possible.

  In step S8, when the AC power supply 33 that has been out of power is restored, and the voltage conversion circuit 29 is activated and the power supply to the control means 21 is resumed, the control means 21 returns from the reset state and waits for the stability of the circuit. After that, wait for zero cross input. When a signal from the zero-cross detection circuit is input, the circuit waits for the circuit to be stable (step S9), and then reads information on the process at the time of power failure from the nonvolatile memory as the storage means (step S10).

  Then, the read power failure information is determined, and if it is recorded that a power failure has occurred (Y in step S11), the first relay 34 is switched to the circuit on the noise filter 32 side (step S12), and the second The relay 31 is closed and the first rectifying / smoothing circuit 30 having a large-capacity smoothing capacitor is turned on, the fourth relay 37 and the relay 39 are closed, and the inverter circuit 22 and the sensor 38 are electrically connected to the circuit. 3 is opened, and the second rectifying / smoothing circuit 36 having a small-capacity smoothing capacitor is turned off (step S13). Then, the washing operation is resumed based on the information about the process at the time of the power failure read from the nonvolatile memory (step S14).

  That is, when the power failure is restored, the first rectifying / smoothing circuit 30 using the large-capacity smoothing capacitor is turned on, and the second rectifying / smoothing circuit 36 using the small-capacity smoothing capacitor is turned off. The motor 49 can be started smoothly by operating the inverter circuit 22.

  If it is determined in step S11 that a power failure has not been recorded in the non-volatile memory (N in step S11), it is determined that the power plug has been removed in the normal state, and a transition is made to a power-on input waiting state (step S15).

  Then, when the control means 21 detects the power-on input (Y in step S16), the first relay 34 is switched to a circuit that bypasses the noise filter 32 after the end sequence corresponding to the state at that time ( Step S17), the second relay 31 is opened, the first rectifying / smoothing circuit 30 is turned off, the fourth relay 37 and the relay 39 are opened, the inverter circuit 22 and the sensor 38 are disconnected from the circuit, 3 is closed and the second rectifying / smoothing circuit 36 is turned on (step S18), and then the power-on input is waited for (step S19).

  If the power is off in step S16 (N in step S16), the first relay 34 is switched to the circuit on the noise filter 32 side (step S20), the second relay 31 is closed, and the first rectification smoothing is performed. The circuit 30 is turned on, the fourth relay 37 and the relay 39 are closed, the inverter circuit 22 and the sensor 38 are connected to the circuit, the third relay 35 is opened, and the second rectifying and smoothing circuit 36 is turned off. After (step S21), the process shifts to an initial standby state (step S22) in which the user accepts an input operation performed from the operation display unit 51 via the operation display circuit 25.

As described above, in the first embodiment, during the stroke operation, the first relay 34 is switched to the noise filter 32 side, the second relay 31 is switched to the closed state, and the third relay 35 is opened. The fourth relay 37 is switched to the closed state, and the first relay 34 is switched to a circuit that bypasses the noise filter 32 when the zero cross detection circuit 24 detects the power interruption and stops operation. By switching the second relay 31 to the open state, switching the third relay 35 to the closed state, and switching the fourth relay 37 to the open state, the standby power when waiting for power-on or power failure recovery can be reduced. Energy saving.

(Embodiment 2)
FIG. 4 is a circuit block diagram of the washing machine according to Embodiment 2 of the present invention, and FIG. 5 is a flowchart showing the operation of the washing machine.

  In the configuration of FIG. 4, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 4, a rectifier circuit 28 composed of a rectifier (diode) is provided on one end side of the second relay 31, and a first first smoothing capacitor 26 is provided on the other end side. The first smoothing capacitor 26 is a large-capacity electrolytic capacitor with a large leakage current for an inverter circuit. The rectifier circuit 28 is provided on one end side of the third relay 35, and the second smoothing capacitor 27 is provided on the other end side. The second smoothing capacitor 27 is a low ESR electrolytic capacitor having a small capacity and a small leakage current. The inverter circuit 22 for connecting the motor 49 is connected to the output side of the first smoothing capacitor 26 and the second second smoothing capacitor 27. There is a fourth relay 37 between the first smoothing capacitor 26 and the second smoothing capacitor 27 and the inverter circuit 22.

  In the flowchart of FIG. 5, steps S1 to S6, steps S8 to S12, S14, and steps S5 to S17, S19, step S20, and step S22 are the same as those in the first embodiment of FIG. Omitted.

  In FIG. 5, the control means 21 detects the rotation stop in step S5, once ends the sequence process, and switches the first relay 34 to a circuit bypassing the noise filter 32 in step S6. Then, the second relay 31 is opened, the smoothing capacitor 26 is turned off, the fourth relay 37 and the relay 39 are opened, the inverter circuit 22 and the sensor 38 are disconnected from the circuit, and the third relay 35 is closed. Then, the second smoothing capacitor 36 is turned on (step S31).

  Here, when the power failure is detected, the large-capacity first smoothing capacitor 26 is turned off, and the small-capacity second smoothing capacitor 27 is turned on, so that the standby power while waiting for the power failure to recover is unlimited. It can be made smaller.

  If it is recorded in step S11 that a power failure has occurred, the first relay 34 is switched to the circuit on the noise filter 32 side in step S12, and then the second relay 31 is closed to increase the capacity. The first smoothing capacitor 26 is turned on, the fourth relay 37 and the relay 39 are closed, the inverter circuit 22 and the sensor 38 are connected to the circuit, the third relay 35 is opened and the second smoothing with a small capacity is performed. The capacitor 27 is turned off (step S32).

  In other words, when the power failure is restored, the large-capacity first smoothing capacitor 26 is turned on and the small-capacity second smoothing capacitor 27 is turned off to operate the inverter circuit 22 and start the motor 49 smoothly. be able to.

If the power is on in step S16, the first relay 34 is switched to a circuit that bypasses the noise filter 32 in step S17, and then the second relay 31 is opened and the first smoothing capacitor 26 is switched. Is turned OFF, the fourth relay 37 and the relay 39 are opened, the inverter circuit 22 and the sensor 38 are disconnected from the circuit, the third relay 35 is closed, and the second smoothing capacitor 27 is turned ON (step S33). After that, the apparatus enters a power-on input wait state (step S19).

  If the power is turned off in step S16 (N in step S16), the first relay 34 is switched to the circuit on the noise filter 32 side (step S20), the second relay 31 is closed, and the first relay 34 is closed. The smoothing capacitor 26 is turned on, the fourth relay 37 and the relay 39 are closed, the inverter circuit 22 and the sensor 38 are connected to the circuit, the third relay 35 is opened, and the second smoothing capacitor 27 is turned off. After (step S34), the process proceeds to the initial standby state (step S22).

    As described above, in the second embodiment, during the stroke operation, the first relay 34 is switched to the noise filter 32 side, the second relay 31 is switched to the closed state, and the third relay 35 is opened. In the state, the fourth relay 37 is switched to the closed state, and when the zero cross detection circuit 24 detects the power cutoff and stops the operation, the first relay 34 is switched to a circuit that bypasses the noise filter 32. The relay 31 is switched to the open state, the third relay 35 is switched to the closed state, and the fourth relay 37 is switched to the open state, thereby reducing standby power when waiting for power on or power recovery. , Energy saving can be realized.

  In the first and second embodiments, all the relays described above may not be electromagnetic relays, but may be semiconductor elements or switches that perform the same operation. In addition, the first relay 34, the fourth relay 37, and the relay 39 are examples of configurations, and may not affect the power consumption. Depending on the product configuration, the noise filter 32 may not be provided or may be in another location.

  Since the block circuit diagram is schematically written, the relay may be placed on the live side of the power source, on the neutral side, or on both sides as long as it is an AC unit. If it is a direct current part, it may be placed on the high voltage side, on the low voltage side, or on both sides. The relay may be on the power supply side of the rectifying / smoothing circuit or on the voltage conversion circuit side.

  Note that the power interruption detection means and the power recovery detection means may not be a zero cross detection circuit, and may detect a power supply voltage.

  As described above, the washing machine according to the present invention makes it possible to reduce standby power when waiting for power failure recovery or power-on input, thereby realizing energy saving. It can be applied to uses such as washing machines and dryers.

DESCRIPTION OF SYMBOLS 21 Control means 22 Inverter circuit 24 Zero cross detection circuit 26 1st smoothing capacitor 27 2nd smoothing capacitor 28 Rectifier circuit 30 1st rectification smoothing circuit 31 2nd relay 32 Noise filter 34 1st relay 35 3rd relay 36 2nd Rectifying and smoothing circuit 37 Fourth relay 40 Upper frame 41 Housing 43 Outer tub 45 Washing / dehydrating tub 47 Pulsator 49 Motor 50 Control device 51 Operation display section

Claims (3)

Two or more sets of rectifying and smoothing circuits having a rectifier and a capacitor connected to an AC power source, an inverter circuit connected to the output of the rectifying and smoothing circuit, an electric motor connected to the output of the inverter circuit, and a control means for controlling operation And a voltage conversion circuit for converting the output of the rectifying and smoothing circuit into a DC voltage used by the control means, and a circuit switching means for switching the rectifying and smoothing circuit. A rectifying and smoothing circuit connected to an AC power source, having a rectifier and two or more capacitors, an inverter circuit connected to the output of the rectifying and smoothing circuit, an electric motor connected to the output of the inverter circuit, and a control means for controlling operation And a voltage conversion circuit for converting the output of the rectifying and smoothing circuit into a DC voltage used by the control means, and a circuit switching means for switching a capacitor of the rectifying and smoothing circuit. The washing machine according to claim 1 or 2, wherein one capacitor of the rectifying and smoothing circuit has a large leakage current and one has a small leakage current.

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