JP2013059485A - Load-driving device and washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely bring a control circuit into a reset state to securely restart a power supply.SOLUTION: A load-driving device comprises: a direct-current power supply circuit for generating driving direct-current power by closing a power-on switch to supply alternate-current power; a control power supply circuit for generating control direct-current power from the driving direct-current power; a driving circuit for driving a load on the basis of the driving direct-current power; a control circuit for controlling drive of the load through the driving circuit when being supplied with the control direct-current power to allow the control circuit to be in an operating state; normally-open switch means connected in parallel with the power-on switch, for being closed when the control circuit is in the operating state, and being restored to be opened when a power-off switch is operated; and normally-close switch means connected in series with the power-on switch, for being opened at the same time as the closing operation of the switch means or after the closing operation, and being restored to be closed after the control circuit loses the control direct-current power to be in a reset state.

Description

  Embodiments described herein relate generally to a load driving device and a washing machine including the load driving device.

  In a washing machine, for example, a fully automatic washing machine, a water receiving tub is elastically supported in an outer box, and a rotating tub for a washing tub / dehydrating tub is provided in the water receiving tub. A stirrer is disposed on the surface. Furthermore, a drive mechanism having a washing machine motor as a load is disposed on the outer surface side of the bottom of the water receiving tub. Based on the driving of the washing machine motor, the stirrer is moved at a low speed during washing operation and rinsing operation. The rotating tub is rotated at a high speed during the dehydrating operation of the washing operation.

  And in a fully automatic washing machine, in order to drive-control a washing machine motor at the time of washing operation, the load drive device is provided. This load driving device is supplied with AC power supplied by closing a switch with power supply to generate a driving DC power supply, a DC power supply circuit having a rectifier circuit and a smoothing capacitor, and a driving DC power supply for the DC power supply circuit A control power supply circuit for generating a control DC power supply, a drive circuit for driving a washing machine motor based on a drive DC power supply for the DC power supply circuit, and a control DC power supply for the control power supply circuit, A control circuit mainly composed of a microcomputer for controlling the driving of the washing machine motor through a drive circuit; and a normally open relay switch connected in parallel to the power-on switch, and controlled by the control circuit. When the control circuit is in an operating state, it operates to close the relay switch, and when the power-off switch is operated, it returns to the relay circuit. And it is configured with a relay to open the switch.

  In other words, the load control device closes the power-on switch, the driving DC power supply of the DC power supply circuit rises, and when the control DC power supply of the control power supply circuit rises and the control circuit enters the operating state in response to this, the relay is turned on. By operating and closing the relay switch, the supply of AC power to the DC power supply circuit is continued even if the power-on switch is subsequently opened, thereby completing the power-on. Thereafter, when the power-off switch is operated, the control circuit returns the relay and opens the relay switch, thereby cutting off the supply of AC power to the DC power supply circuit. As a result, the smoothing capacitor of the DC power supply circuit is discharged and the drive DC power supply is lost, and when the control DC power supply of the control power supply circuit is lost and falls below the reset voltage of the control circuit, the control circuit is reset. Thus, the power can be turned on again by the closing operation of the next power-on switch.

  However, in the above configuration, even if the power-off switch is operated, it takes some time until the smoothing capacitor of the DC power supply circuit is discharged and the control DC power supply of the control power supply circuit is lost and the control circuit is reset. Therefore, if the user closes the power-on switch during this time, AC power is supplied to the DC power supply circuit and the smoothing capacitor of the DC power supply circuit is charged, and the control circuit is reset. Therefore, there is a problem that the power cannot be turned on again.

JP 2000-23479 A

  Therefore, a load driving device that can reliably reset the control circuit and can be surely turned on again, and a washing machine equipped with the load driving device are provided.

The load driving device of the present embodiment generates a driving DC power supply by supplying an AC power supply by closing a power-on switch that is closed during operation, a power-off switch, and the power-on switch being closed. A DC power supply circuit having a rectifying circuit and a smoothing capacitor, a control power supply circuit for generating a control DC power supply by being supplied with a drive DC power supply for the DC power supply circuit, and driving a load based on the drive DC power supply for the DC power supply circuit And a control circuit for controlling the driving of the load via the drive circuit when the control circuit is supplied with a control DC power supply for the control power supply circuit and enters an operation state, and connected to the power-on switch in parallel. A normally-open type switch means controlled by a circuit, which is closed when the control circuit is in an operating state, and is opened again when the power-off switch is operated; A normally closed type connected in series to the power-on switch, which opens simultaneously with or after the closing operation of the switch means, and returns to the closed state after the control circuit is reset due to the loss of the control DC power supply. Switch means.
The washing machine of this embodiment includes the load driving device described above, and the load is a washing machine load such as a washing machine motor.

Electrical configuration diagram of the load driving device showing the first embodiment Vertical side view showing the schematic structure of the entire fully automatic washing machine Action diagram when operating the power switch Action explanatory diagram when operating the power switch FIG. 1 equivalent diagram showing the second embodiment Action explanatory diagram showing the third embodiment FIG. 6 equivalent view showing the fourth embodiment

Hereinafter, a plurality of embodiments applied to a fully automatic washing machine will be described with reference to the drawings. In each embodiment, the same portions are denoted by the same reference numerals.
(First embodiment)
The first embodiment will be described below with reference to FIGS.
First, in FIG. 2 which shows the schematic structure of the whole fully automatic washing machine, the hollow tank-shaped housing | casing 1 which forms an outer shell is equipped with the rotation tank 4 and the water receiving tank 5 which are mentioned later. The housing 1 includes an outer box 2 and a top cover 3 that is attached so as to cover the upper surface of the outer box 2.

  The top cover 3 is formed with a laundry entrance / exit 6 at the center thereof, and for example, a folded laundry lid 7 for opening and closing the laundry entrance / exit 6 is rotatably attached thereto. An operation panel 8 is provided on the front outer surface of the top cover 3, and a control circuit 9 is provided on the lower surface portion thereof. The control circuit 9 is mainly composed of a microcomputer including a CPU, ROM, RAM, drive circuit, peripheral circuit, and the like (not shown), and has a function of controlling the overall washing operation.

  On the other hand, a mechanism chamber 3a is formed in the rear portion of the top cover 3 so as to form a large raised space, and a water supply valve 10 as a washing machine load connected to a faucet (not shown) is shown in the interior thereof. Although it is configured to have a water supply case 11 and a water supply pipe 12 that can be set to supply a soft finish or the like, the tip of the water supply pipe 12 is connected in communication with the water receiving tank 5.

  On the other hand, in the outer box 2, the water receiving tank 5 is elastically supported via a suspension bar mechanism 13. That is, the outer box 2 has a rectangular box shape, and the suspension rods 13a are suspended from the upper portions of the four corners, respectively, and coil springs 13b are attached as elastic members to the lower ends of the suspension rods 13a. The water receiving tank 5 is suspended through the coil spring 13b.

  The water receiving tank 5 has a bottomed cylindrical shape with an open upper surface, and a drive mechanism unit 15 mainly including a washing machine motor 14 (see FIG. 1) as a load, that is, a washing machine load, is attached to the outer surface side of the bottom portion. In addition, a drain valve 16 and a drain hose 17 are also provided as a washing machine load for draining from the water receiving tank 5.

  Further, a water receiving tank cover 18 having a disk shape is attached to the upper end of the water receiving tank 5 so as to cover the upper surface thereof. The water receiving tank cover 18 has a water supply pipe connection port 19 that communicates inside and outside at the rear portion, and the water supply pipe 12 is connected to the connection port 19. A water supply guide member 20 is integrally provided on the back surface side of the water supply pipe connection port 19 at a position facing the water supply pipe connection port 19 so that, for example, water can be supplied in a shower-like manner toward the inside of the tank. Further, on the center side of the water receiving tank cover 18, there is an opening 18a for putting in and taking out the laundry, and an inner lid 21 for opening and closing the opening 18a is rotatably provided.

  The washing tub / dehydration rotator 4 is rotatably provided inside the water receiving tub 5 and has a bottomed cylindrical shape similar to the water receiving tub 5, and has a large number of through holes 4a and protrusions 4b on the peripheral wall. The liquid balancer 22 is attached and fixed to the upper end opening. A hollow cylindrical dewatering shaft 23 extending from the drive mechanism 15 and projecting through the bottom of the water receiving tank 5 is connected to the center of the bottom of the rotating tank 4. A washing shaft 24 is inserted into the hollow portion of the dewatering shaft 23, and a stirring body 25 disposed on the inner bottom portion of the rotating tub 4 is connected and fixed to the upper end portion of the washing shaft 24.

  By the way, the drive mechanism unit 15 includes a clutch mechanism (not shown) that switches between rotation transmission in washing, rinsing operation and dehydration operation, and the control circuit 9 is a washing machine motor via an inverter circuit 38 to be described later. 14 is rotated forward and reverse at a low speed during a washing and rinsing operation, and rotated in one direction at a high speed during a dehydration operation. The clutch mechanism is configured to transmit the rotation of the washing machine motor 14 to the washing shaft 24 during the rinsing operation to rotate the agitator 25 forward and reverse at a low speed, and to the dehydrating shaft 23 during the dehydration operation, thereby rotating the rotating tub 4. Rotate in one direction at high speed.

  The safety lever device 26 provided in the mechanism chamber 3 a of the top cover 3 includes a safety lever 27 that hangs down in the outer box 2, although a detailed description is omitted. The safety lever 27 hangs down to a position where it wraps in the vertical direction with the outer surface of the water receiving tank 5, and is provided so as to be able to face and oscillate through a predetermined gap in the radial direction. Therefore, the predetermined position of the safety lever 27 is determined so that the outer surface of the water receiving tank 5 comes into contact with the safety lever 27 when the water receiving tank 5 is shaken outward by a vibration. ing. In the case of contact, the switch function (not shown) provided in the safety lever device 26 responds in response to the operation displacement of the safety lever 27, that is, functions as vibration detection means. The signal is input to the control circuit 9. At this time, the control circuit 9 stops the dehydration operation.

Next, a load driving device that drives and controls the washing machine motor 14 will be described with reference to FIG.
The DC power supply circuit 28 includes a full-wave rectifier circuit 29 formed by bridge-connecting four diodes as a rectifier circuit, DC power supply lines 30 and 31 connected to a DC output terminal of the full-wave rectifier circuit 29, and these Smoothing capacitors 32 and 33 connected in series between the DC power supply lines 30 and 31. The DC power supply line 31 is connected to the ground (GND). In the full-wave rectifier circuit 29, one AC input terminal is connected to one terminal of the plug 34, and the other AC input terminal is connected to a common connection point of the smoothing capacitors 32 and 33. And connected to the other terminal of the plug 34 via a normally open relay switch 35a which is a normally open switch means of the first relay 35.

  Further, a series circuit of a power-on switch 36 and a normally closed relay switch 37b, which is a normally closed switch means of the second relay 37, is connected in parallel with the relay switch 35a. Accordingly, the normally open relay switch 35a of the first relay 35 is connected in parallel to the power-on switch 36, and the normally closed relay switch 37b of the second relay 37 is connected in series to the power-on switch 36. It becomes a form. In this case, the power-on switch 36 is composed of a push button switch and is closed during operation. The relays 35 and 37 have excitation coils 35C and 37C. These excitation coils 35C and 37C will be described later.

  The plug 34 is inserted and connected to an outlet (not shown) supplied with a commercial power of 100 V (volts) as an AC power source. Therefore, when 100V commercial power is supplied to the DC power supply circuit 28 as will be described later, the DC power supply circuit 28 acts as a voltage doubler rectifier circuit to generate a drive DC power supply of EaV (for example, 282V) to generate DC It is generated between the power lines 30 and 31.

  The inverter circuit 38 serving as a drive circuit is configured by connecting three IGBTs, which are not shown in the figure, as IGBTs, which are six semiconductor switching elements, with a DC input terminal connected to DC power supply lines 30 and 31, The three-phase AC output terminal is connected to the input terminal of the washing machine motor 14. The washing machine motor 14 is composed of an outer rotor type three-phase brushless motor.

    In the control power supply circuit 39, the DC input terminal is connected to the DC power supply lines 30, 31, and the three DC output terminals are connected to the control power supply lines 40, 41, 42. The control power supply circuit 39 steps down the drive DC power supply of EaV given to the DC input terminal, generates a control DC power supply of EbV (for example, 15V) and generates it between the control power supply lines 40 and 42, and also EcV (for example, 3.3V) is generated between the control power lines 41 and 42. Note that the control power line 42 is connected to the ground (GND).

  The power input terminal of the control circuit 9 is connected to control power lines 40, 41, 42. In this case, in the control circuit 9, the EcV control DC power supply between the control power supply lines 41 and 42 is supplied to the microcomputer, and the EbV control DC power supply between the control power supply lines 40 and 42 is supplied to the other peripheral circuits. It is done. A power-off switch 43 is connected to the input terminal of the control circuit 9. The power-off switch 43 is composed of a push button switch and closes while being operated. The output terminal of the control circuit 9 is connected to a water supply valve 10 and a drain valve 16 as washing machine loads, and controls them.

  In the control circuit 9, one control terminal is connected to one terminal of the excitation coil 35 </ b> C of the first relay 35, and the other control terminal is connected to one terminal of the excitation coil 37 </ b> C of the second relay 37. The other terminals of the exciting coils 35C and 37C are connected to the ground (GND). The control circuit 9 includes a control switch 44, and this control switch 44 is connected between the DC power supply lines 30 and 31 via a discharge resistor 45 in series.

  When the control circuit 9 is initialized by being supplied with the control DC power supply between the control power supply lines 41 and 42 and is initialized, the first relay 35 by the control DC power supply between the control power supply lines 40 and 41 is used. The first relay 35 is operated by forming an energization circuit for the exciting coil 35C (the normally open relay switch 35a is closed), and the control DC power supply between the control power supply lines 40 and 41 is slightly delayed. The energizing circuit of the exciting coil 37C of the second relay 37 is formed to operate the second relay 37 (the normally closed relay switch 37b is opened). In this case, the second relay 37 forms a self-holding circuit with a control DC power supply between the control power supply lines 40 and 41. The operation of the second relay 37 may be at the same time as the operation of the first relay 35.

  Further, when the power-off switch 43 is operated, the control circuit 9 turns off the energization circuit of the exciting coil 35C of the first relay 35 and returns the first relay 35 (the normally open relay switch 35a is opened). The control switch 44 is closed. Thereafter, when the control circuit 9 is reset due to the loss of the control DC power supply between the control power supply lines 40 and 41, the control switch 44 is automatically opened. However, the second relay 37 in which a self-holding circuit using a control DC power supply between the control power supply lines 40 and 41 is formed has its return voltage set so that it returns slightly later after the control circuit 9 is reset. Has been. Therefore, the second relay 37 returns with a slight delay after the control circuit 9 is reset (the normally closed relay switch 37b opens). The setting of the return voltage of the second relay 37 corresponds to a return delay delay means.

The operation of the first embodiment will be described with reference to FIGS. 3 and 4 as well.
In the washing operation stop state in which the power is not turned on to the load driving device, as shown in FIG. 1, the power-on switch 36 and the power-off switch 43 are open, and the first relay 35 is restored and is always on. The open relay switch 35a is opened, the second relay 37 is restored, and the normally closed relay switch 37b is closed.

  As shown in FIG. 3 (a), when the user operates the power-on switch 36 to close it, 100V commercial power is supplied to the DC power circuit 28 via the power-on switch 36 and the relay switch 37b. This is full-wave rectified by the full-wave rectifier circuit 29 and smoothed by the smoothing capacitors 32 and 33 to generate a drive DC power supply of EaV (for example, 282 V), which is generated between the DC power supply lines 30 and 31. The control power supply circuit 39 generates a control DC power supply of EbV (for example, 15V) between the control power supply lines 40 and 42 based on this drive DC power supply, and also provides an EcV (for example, 3.3V) between the control power supply lines 41 and 42. ) Control DC power source.

  When the voltage of the control DC power supply between the control power supply lines 41 and 42 becomes the operating voltage of the control circuit 9, the control circuit 9 enters the operating state and is initialized. As a result, the control circuit 9 forms an energization circuit for the exciting coil 35C by the control DC power supply between the control power supply lines 40 and 42 of the first relay 35 to operate the first relay 35. FIG. As shown in (b), the relay switch 35a is closed. Therefore, even if the power-on switch 36 is subsequently opened, the supply of commercial power to the DC power supply circuit 28 is continued by the relay switch 35a, and the power-on is completed.

  The control circuit 9 forms an energization circuit for the exciting coil 37C by the control DC power supply between the control power supply lines 40 and 42 of the second relay 37 with a slight delay after operating the first relay 35 to form the second relay. 37, the relay switch 37b is opened as shown in FIG. In this case, the second relay 37 forms a self-holding circuit with a control DC power supply between the control power supply lines 40 and 41. Therefore, the second relay 37 continues to operate until the voltage of the control DC power supply between the control power supply lines 40 and 41 drops to the return voltage.

  Note that when the start switch provided on the operation panel 8 is operated, the control circuit 9 executes a washing operation including a washing operation, a rinsing operation, and a dehydrating operation based on a control program stored in the ROM. Detailed description is omitted.

  As shown in FIG. 4 (a) (same as FIG. 3 (c)), in the state where commercial power is supplied to the DC power supply circuit 28 by the relay switch 35a of the first relay 35, the user turns off the power switch. When 43 is operated and closed, the control circuit 9 turns off the energization circuit of the exciting coil 35C of the first relay 35 to return the first relay 35, and as shown in FIG. The relay switch 35a is opened, and at the same time the control switch 44 is closed. When the relay switch 35a is opened, the supply of commercial power to the DC power supply circuit 28 is cut off, and when the control switch 44 is closed, a discharge circuit passing through the discharging resistors 45 of the smoothing capacitors 32 and 33 of the DC power supply circuit 28 is created. The smoothing capacitors 32 and 33 are forcibly discharged.

  The voltage of the drive DC power supply between the DC power supply lines 30 and 31 decreases due to the discharge of the smoothing capacitors 32 and 33. The control DC between the control power supply lines 40 and 42 and 41 and 42 generated from this drive DC power supply is reduced. The voltage of the power supply also drops. When the voltage of the control DC power supply between the control power supply lines 41 and 42 drops to the reset voltage of the control circuit 9, the control circuit 9 is reset and the control switch 44 is released. Thereafter, when the voltage of the control DC power supply between the control power supply lines 40 and 42 drops to the return voltage of the second relay 37, the second relay 37 returns and, as shown in FIG. 4C, the relay switch 37b. To return to closure.

  Accordingly, even when the supply of commercial power to the DC power supply circuit 28 is cut off, the relay switch 37b of the second relay 37 is open in the state of FIG. 4B in which the control circuit 9 is not in the reset state. Therefore, even if the user operates the power-on switch 36 to close it, the commercial power is not supplied to the DC power supply circuit 28 and the smoothing capacitors 32 and 33 of the DC power supply circuit 28 are charged. Without this, the control circuit 9 can be reliably reset.

As described above, according to the first embodiment, the power-off switch that is operated when the control circuit 9 enters the operating state in parallel with the power-on switch 36 for supplying commercial power to the DC power circuit 28. A normally open relay switch 35a of the first relay 35 that is restored when the switch 43 is operated is connected, and is operated in series with the power-on switch 36 with a slight delay from the operation of the first relay 35. Since the normally closed relay switch 37b of the second relay 37 that returns after a slight delay after the circuit 9 enters the reset state is connected, before the control circuit 9 enters the reset state due to the loss of the control DC power supply. Even when the power-on switch 36 is closed, commercial power is not supplied to the DC power circuit 28, and the control circuit 9 can be reliably reset. It, it is possible to reliably cycled commercial power to the DC power supply circuit 28.
Further, since the control circuit 9 controls the operation and return of the first relay 35 and the operation of the second relay 37, the timing of closing and opening of the relay switch 35a and opening of the relay switch 37b are accurately determined. And reliable control can be performed.

  Further, when the supply of commercial power to the DC power supply circuit 28 is cut off by opening the relay switch 35a of the first relay 35, the discharge circuit of the smoothing capacitors 32 and 33 is formed by closing the control switch 44. As a result, the control DC power supply can be quickly lost and the control circuit 9 can be quickly reset. Further, since the reset voltage of the second relay 37 is set as a delay means for the second relay 37 to return with a slight delay from the reset state of the control circuit 9, the control circuit 9 has a corresponding amount. The burden can be reduced.

(Second Embodiment)
FIG. 5 shows a second embodiment.
The second embodiment differs from the first embodiment in that a second relay 46 is used instead of the second relay 37. The second relay 46 has a normally-closed relay switch 46b as a normally-closed switch means instead of the relay switch 37b. The relay switch 46b is connected in series to the power-on switch 36. The second relay 46 has an exciting coil 46C instead of the exciting coil 37C. In the exciting coil 46C, one terminal is connected to the control power supply line 40 via the backflow prevention diode 47, and the other terminal is connected to the ground (GND). A backup capacitor 48 as a delay means is connected in parallel with the exciting coil 46C.

  Accordingly, the commercial power supply is supplied to the DC power supply circuit 28 by closing the power-on switch 36, and an EaV driving DC power supply is generated between the DC power supply lines 30 and 31, and the control power supply lines 40 and 42 are responded accordingly. In addition, an EcV control DC power supply and an EcV control DC power supply are generated between the control power supply lines 41 and 42. In this case, even if the control circuit 9 enters the operating state and operates the first relay 35, the voltage applied to the exciting coil 46C of the second relay 46 rises to the operating voltage until the backup capacitor 48 completes charging. do not do. Thereafter, when the applied voltage to the exciting coil 46C becomes the operating voltage, the second relay 46 operates to open the normally closed relay switch 46b.

When the first relay 35 is restored, the relay switch 35a is opened, and the supply of commercial power to the DC power supply circuit 28 is cut off, the control circuit 9 is activated by the loss of the control DC power supply between the control power supply lines 41 and 42. Even in the reset state, the second relay 46 continues to operate until the discharge of the backup capacitor 48 proceeds. Thereafter, when the discharge of the backup capacitor 48 progresses and the applied voltage of the exciting coil 46C becomes the return voltage, the second relay 46 returns to close the relay switch 46b.
The same effect as that of the first embodiment can be obtained by the second embodiment as well, and in particular, the second relay 46 is not controlled by the control circuit 9 at all. Can be reduced.

(Third embodiment)
FIG. 6 shows a third embodiment.
In the third embodiment, a resistor 49 is connected in series to a series circuit of a power-on switch 36 and a relay switch 37b. Therefore, the relay switch 35a is connected in parallel to the series circuit of the power-on switch 36, the relay switch 37b, and the resistor 49.

According to the third embodiment, the inrush current when the power switch 36 is closed can be suppressed.
A relay switch 46b may be connected instead of the relay switch 37b.

(Fourth embodiment)
FIG. 7 shows a fourth embodiment.
In the fourth embodiment, a semiconductor switching element such as a bidirectional three-terminal thyristor (triac) 50 is used as a normally open switch means instead of the first relay 35, and the bidirectional three-terminal thyristor 50 is The power switch 36 and the relay switch 37b are connected in parallel in a series circuit. Then, a gate signal is given to the gate of the bidirectional three-terminal thyristor 50 from the control circuit 9 (see FIG. 1) at the operation timing of the first relay 35, and at the return timing of the first relay 35. It will not be given.

According to the fourth embodiment, chattering like the relay switch 35a can be prevented and the operation reliability can be improved.
A relay switch 46b may be connected instead of the relay switch 37b.

(Other embodiments)
In the second embodiment, the second relay 46 is used. Instead, a time-limited operation time-return type relay is used as the second relay, and the normally closed relay switch is used as the power-on switch 36. You may make it connect in series. In this case, the backflow prevention diode 47 and the backup capacitor 48 are unnecessary, and the time-return return characteristic of the relay corresponds to the delay means.
The above embodiment is a case where the present invention is applied to a fully automatic washing machine, but is not limited thereto, and can be applied to all washing machines such as a drum-type washing / drying machine. It can be applied to the load driving apparatus.

  As described above, according to the present embodiment, the power-on switch that is closed during operation, the power-off switch, and the power-on switch is closed so that AC power is supplied to drive the DC power source. A DC power supply circuit having a rectifier circuit and a smoothing capacitor for generating the DC power supply circuit, a control power supply circuit for generating a control DC power supply supplied with a drive DC power supply for the DC power supply circuit, and a load based on the drive DC power supply for the DC power supply circuit Is connected in parallel to the control circuit for controlling the driving of the load via the driving circuit and the power-on switch. A normally open type switch that is controlled by the control circuit and is closed when the control circuit is in an operating state, and is opened again when the power-off switch is operated. Connected in series with the power-on switch, and opens at the same time as or after the closing operation of the switch means, and returns to the closed state after the control circuit is reset due to the loss of the control DC power supply. It is characterized in that it comprises a normally closed switch means. With such a configuration, the control circuit can be reliably reset and the power can be turned on again.

  Although several embodiments have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 1 is a housing, 4 is a rotating tank, 5 is a water receiving tank, 9 is a control circuit, 14 is a washing machine motor (load, washing machine load), 15 is a drive mechanism, 28 is a DC power supply circuit, and 29 is Full-wave rectifier circuit (rectifier circuit), 32 and 33 are smoothing capacitors, 35 is a first relay, 35a is a normally open relay switch (normally open switch means), 36 is a power-on switch, 37 is The second relay, 37b is a normally closed relay switch (normally closed switch means), 38 is an inverter circuit (drive circuit), 39 is a control power circuit, 43 is a power switch, 44 is a control switch, and 45 is for discharge. A resistor 46 is a second relay, 46b is a normally closed relay switch (normally closed switch means), 48 is a backup capacitor, and 50 is a bidirectional three-terminal thyristor (normally open switch means).

Claims (5)

A power-on switch that closes during operation,
A power switch,
A DC power supply circuit having a rectifier circuit and a smoothing capacitor for generating a drive DC power supply by supplying an AC power supply by closing the power-on switch;
A control power supply circuit that is supplied with a drive DC power supply of the DC power supply circuit and generates a control DC power supply;
A driving circuit for driving a load based on a driving DC power supply of the DC power supply circuit;
A control circuit for controlling the driving of the load via the drive circuit when the control DC power supply of the control power supply circuit is supplied and enters an operation state;
A normally-open switch means connected in parallel to the power-on switch, controlled by the control circuit, closed when the control circuit is in operation, and opened again when the power-off switch is operated When,
A normally closed type connected in series to the power-on switch, which opens simultaneously with or after the closing operation of the switch means, and returns to the closed state after the control circuit is reset due to the loss of the control DC power supply. A load driving device.   2. The load driving device according to claim 1, wherein the normally closed switch means is opened by the control of the control circuit.   3. The load driving device according to claim 1, wherein the normally closed switch means is provided with delay means so that the normally closed switch means returns to the closed state after the control circuit is reset.   4. The load driving apparatus according to claim 3, wherein the delay means is a backup capacitor of a control DC power source provided to the normally closed switch means.   A washing machine comprising the load driving device according to any one of claims 1 to 4, wherein the load is a washing machine load such as a washing machine motor.

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