JP2014045836A - Drum type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a drum type washing machine including a motor driving device capable of boost controlling a direct current supplied to an inverter circuit under appropriate conditions corresponding to a state.SOLUTION: A drum type washing machine includes: a shorting circuit 32 comprising: a reactor 34 connected in series between an AC power supply 31 and a full-wave rectifying circuit 36; a short-circuit control element 35 connected between one end of the reactor 34 and one end on an input side of the full-wave rectifying circuit 36, in parallel with the AC power supply 31; and a current detection circuit 40. A control unit 30 for driving a first inverter circuit 22 includes: a short-circuit signal generation unit. The short-circuit signal generation unit generates a short-circuit signal Ps beginning at a zero-cross detection point of an AC power supply voltage, and sets pulse width Tw of the short-circuit signal, target rotation frequency Nt of a drum motor 7, and a target voltage Vt of a direct current voltage Vd which is set according to the target rotation frequency Nt of the drum motor 7 and which is applied to the first inverter circuit 22, based on a current Id flowing in the current detection circuit 40 and generation time Tp of the short-circuit signal Ps.

Description

  The present invention relates to a drum type in which a rotating drum and a compressor motor are driven by an inverter circuit in order to drive the rotating drum and the compressor motor containing the laundry at a rotational speed corresponding to each process such as washing, dehydration, and drying. It relates to a washing machine.

  An example of the structure of a drum-type washing machine using a conventional dehumidifying and drying method using a heat pump is shown in FIGS. FIG. 5 is a cross-sectional view showing a configuration of a conventional drum-type washing machine, and FIG. 6 is an internal rear view thereof.

  In this drum type washing machine, a water tub 2 is supported in a suspended state in a washing machine body 1 by a suspension structure (not shown). A rotating drum 3 formed in a bottomed cylindrical shape is supported in the water tank 2 with its axial direction inclined downward from the front side to the back side. On the front side of the aquarium 2 is formed a clothing doorway 4 leading to the opening end of the rotary drum 3, and by opening the door 5 that closes the opening provided in the upward inclined surface on the front side of the washing machine body 1 so that it can be opened and closed. The laundry can be taken in and out of the rotary drum 3 through the clothing entrance 4.

  The rotating drum 3 is formed with a large number of through holes 6 communicating with the inside of the water tank 2 on its peripheral surface, and provided with stirring protrusions (not shown) at a plurality of positions on the inner peripheral surface. The rotating drum 3 is rotationally driven in the forward and reverse directions by a drum motor 7 attached to the back side of the water tank 2. In addition, a water injection pipe 8 and a drain pipe 9 are connected to the water tank 2 to perform water injection and drainage into the water tank 2 by controlling a water injection valve and a water discharge valve (not shown).

  When the door 5 is opened, laundry and detergent are put into the rotating drum 3 and the operation is started by an operation on the operation panel 10 provided at the upper part of the front surface of the washing / drying main body 1, for example, a water injection pipe is placed in the water tank 2. A predetermined amount of water is injected from the path 8 and the drum 3 is driven to rotate the rotating drum 3 to start the washing process. By the rotation of the rotating drum 3, the laundry accommodated in the rotating drum 3 is lifted in the rotating direction by the stirring protrusion provided on the inner peripheral wall of the rotating drum 3, and the stirring operation of dropping from the lifted appropriate height position Is repeated, so that the laundry has the effect of tapping and washing.

  After the required washing time, the dirty washing liquid is discharged from the drain pipe 9 and the washing liquid contained in the laundry is dehydrated by a dehydrating operation of rotating the rotary drum 3 at a high speed. Rinsing is performed by pouring water from the path 8. Also in this rinsing process, the laundry stored in the rotating drum 3 is rinsed by repeating the stirring operation of being lifted and dropped by the stirring protrusions by the rotation of the rotating drum 3.

  This drum type washing machine is provided with a function of drying laundry stored in the rotary drum 3, and the air in the water tank 2 is exhausted and dehumidified by the circulation air passage 11 to be heated and dried. Is again blown into the water tank 2. In the middle of the circulation air passage 11, a dehumidifying means such as an evaporator 12, a heat pump composed of a heating means such as a condenser 13, and a circulation fan 14 serving as an air blowing means are provided. As shown in FIG. 6, the evaporator 12 and the condenser 13 are arranged at the lowest position of the circulation air passage 11 as a heat exchange part 15 with the circulation air.

By rotating and driving the circulation fan 14, an air flow is generated in the circulation air passage 11, and the air in the rotating drum 3 containing the laundry is circulated from the water tank 2 to the circulation fan 14 through the through holes 6. High-temperature air that is always dried by being exhausted to the air introduction pipe 16 and dehumidifying the evaporator 12 located upstream of the circulation fan 14 by dew condensation and heating by heat exchange with the condenser 13. It is said.

  The dried high-temperature air is sent from the circulation fan 14 to the air duct 17 to the water tank 2 and blown into the water tank 2. The high-temperature dry air blown into the water tank 2 enters the rotating drum 3 through the through holes 6 and escapes to the water tank 2 while being exposed to laundry such as clothes, and is again introduced into the circulating air introduction pipe line 16. A drying process is implemented by the repetition of the circulation of the air in the above circulation ventilation path 11.

  In the drying process using the circulation air passage 11, foreign matter such as lint generated from laundry such as clothes is mainly circulated in the air circulated through the circulation air passage 11, and the evaporator 12 and the condenser 13 are circulated. Clogging, clogging into the rotating part of the circulation fan 14, and difficulty in performing a drying process such as accumulation on the inner surface of the circulation fan 14. A filter 18 for removing foreign matter is provided.

  The motor driving device of the drum type washing machine configured as described above includes a DC voltage supply source including an inverter circuit for the drum motor 7 that rotationally drives the rotary drum 3 and an inverter circuit that drives the compressor motor for the heat pump. Is shared. Therefore, in the operation state of the compressor motor, or in the dehydration drying operation process in which the dehydration operation and the heat pump drying operation are performed simultaneously, the AC power supply current may increase and the outlet capacity may be exceeded.

  For this reason, for example, Patent Document 1 discloses an AC power source by estimating and calculating the input or output power of each of the drum motor and the compressor motor at the time of the dehydration drying operation, which is the maximum power consumption of the washing machine, from the respective motor currents. It is disclosed that the current is controlled so as not to exceed the outlet capacity upper limit value. Thereby, the DC voltage of the inverter circuit can be supplied stably.

  Patent Document 2 discloses means for short-circuiting the AC power supply via a reactor connected in series with the AC power supply between the rectifier circuit for supplying the DC voltage Vd to the inverter circuit for driving the motor and the AC power supply. A provided motor drive circuit is disclosed. The short-circuit means performs a short-circuit operation during a period set by the pulse width Tw of the control signal, starting from a predetermined delay time Td from the zero crossing time of the AC power supply. The power factor is supplied to the inverter circuit while keeping the power factor of the power supply device at the maximum value even if the power supply voltage fluctuates by improving the power factor by short-circuiting the power supply once or multiple times in the half cycle of the power supply voltage Vs. The DC voltage Vd can be controlled to be constant.

JP 2008-54811 A JP 2004-72806 A

  In order to improve the function of the washing machine, for example, it is desired to increase the rotation speed of the drum motor in the dehydration process, for example, to increase the maximum rotation speed from the conventional 1200 r / min to 1600 r / min. . However, considering the increase in cost and energy saving, it is desirable to enable high-speed rotation without increasing the size of the motor.

However, in order to increase the rotation speed without increasing the size of the motor, it is necessary to increase the power supplied to the motor. On the other hand, when the supplied power is increased, the DC voltage supplied to the inverter circuit is reduced. In particular, in the dehydration process during the operation including the dehydration process and the drying process, the decrease in the DC power supply voltage becomes very large during the parallel drive period in which the drum motor and the compressor motor are simultaneously driven.

  Further, in the drying process, it is desired to maintain the DC voltage in order to stably operate the circulation fan even under a situation where the DC voltage decreases with a decrease in the power supply voltage or an increase in the compressor motor output for the heat pump.

  In order to avoid such a drop in the DC voltage and maintain a sufficient level of DC voltage and supply sufficient power to the drum motor and the like, we studied boosting the DC voltage with a booster circuit. However, when using a booster circuit, the temperature of the short-circuit element used in the rectifier circuit or short circuit may rise due to fluctuations in the power supply voltage, which may exceed the specifications of the parts. Appropriate and appropriate control is required. However, the techniques disclosed in Patent Documents 1 and 2 do not meet such requirements.

  Accordingly, an object of the present invention is to provide a drum type washing machine including a motor driving device capable of boosting and controlling a DC voltage supplied to an inverter circuit under appropriate conditions according to the situation.

  In order to solve the above problems, a drum-type washing machine of the present invention includes a rotating drum having a rotation center axis in a horizontal direction or an inclination direction, a water tank holding the rotating drum rotatably, and the rotating drum. A drum motor for rotational driving; a rectifying circuit for rectifying alternating current from an alternating current power supply; a smoothing capacitor connected to an output terminal of the rectifying circuit; and a parallel connection to the smoothing capacitor for driving and controlling the drum motor. 1 inverter circuit; a reactor connected in series to one end of the AC power supply and one end on the rectifier circuit input side; a short-circuit control element having one end connected between one end of the reactor and one end on the rectifier circuit input side , And one end connected to the other end of the short-circuit control element, and the other end is connected to the other end of the AC power supply and the other end on the rectifier circuit input side. A short circuit having a current detection circuit for detecting a current, a zero cross detection circuit for detecting a zero cross of the voltage of the AC power supply, and a controller for driving the first inverter circuit and controlling a series of washing operations. .

  The control unit includes a rotation number detection unit that detects the rotation number of the drum motor, a DC voltage detection unit that detects a DC voltage Vd output to both ends of the smoothing capacitor, and a short circuit signal that causes the short circuit control element to conduct. The short circuit signal generation part which produces | generates is comprised. The short-circuit signal generation unit generates the short-circuit signal from a zero-cross detection point of the AC power supply voltage as a starting point at least during a partial period of the dehydration process, and the short-circuit signal pulse width Tw and the target rotation speed of the drum motor Nt and the target voltage Vt of the DC voltage Vd set according to the target rotational speed Nt of the drum motor are set based on the current Id flowing through the current detection circuit and the generation time Tp of the short circuit signal.

  According to the drum type washing machine of the present invention, the short circuit signal is generated starting from a zero crossing detection point of the AC power supply voltage, the pulse width Tw of the short circuit signal, the target rotational speed Nt of the drum motor, and the drum Since the target voltage Vt of the DC voltage Vd set according to the target rotational speed Nt of the motor is set based on the current Id flowing through the current detection circuit and the generation time Tp of the short circuit signal, it is supplied to the inverter circuit The DC voltage to be boosted can be controlled under appropriate conditions according to the situation.

The block diagram which shows the motor drive device of the drum type washing machine in Embodiment 1 of this invention. The figure which shows the operation at the time of the short circuit with the short circuit of the motor drive device (A) The figure which shows the change of the input current to the full wave rectifier circuit by operation | movement of the short circuit of the motor drive device. (B) The change of the input current to the full wave rectifier circuit in the conventional motor drive device without the short circuit. Illustration The figure for demonstrating the setting example of the step-up operation of DC voltage of the motor drive device Sectional drawing which shows the structure of the drum-type washing machine using the dehumidification drying system by the conventional heat pump Inside rear view of the drum type washing machine

  The drum type washing machine of the present invention can take the following aspects based on the above-described configuration.

  That is, in the above configuration, at least a compressor is provided, drying means for introducing air in the water tank through a circulation path to dehumidify and heat, a compressor motor for driving the compressor, and the smoothing capacitor in parallel. A second inverter circuit connected to and controlling the drive of the compressor motor, wherein the control unit is configured to drive the second inverter circuit together with the first inverter circuit, and the control unit When the drum motor and the compressor motor are simultaneously driven in parallel to perform an operation including a process and a drying process, it is preferable to perform control so as to increase the DC voltage Vd by operating the short circuit. .

  The control unit generates the short circuit signal starting from a zero-crossing detection point of the AC power supply voltage, the pulse width Tw of the short circuit signal, the target rotation speed Nt of the drum motor, and the target rotation of the drum motor. The target voltage Vt of the DC voltage Vd set according to the number Nt can be set based on the current Id flowing through the current detection circuit and the generation time Tp of the short circuit signal.

  In addition, it comprises at least a compressor, and is connected in parallel to a drying means for introducing air in the water tank through a circulation path to dehumidify and heat, a compressor motor for driving the compressor, and the smoothing capacitor, A second inverter circuit for driving and controlling the compressor motor, wherein the control unit is configured to drive the second inverter circuit together with the first inverter circuit, and the control unit is configured for the drying process. When the compressor motor is driven to rotate, the short circuit signal is generated starting from a zero-cross detection point of the AC power supply voltage, and the pulse width Tw of the short circuit signal and the rotation speed Nt ′ of the compressor motor are It can be set based on the current Id flowing through the current detection circuit and the generation time Tp of the short circuit signal.

  Further, a thermistor capable of detecting the temperature in the substrate is provided, and the controller controls the pulse width of the short circuit signal based on the value of the thermistor, the current Id flowing through the current detection circuit, and the generation time Tp of the short circuit signal. Tw can be set.

  In addition, the control unit may detect the drum motor when the DC voltage Vd cannot be boosted according to the target voltage Vt based on a value calculated from the current Id flowing through the current detection circuit and the generation time Tp of the short circuit signal. It is preferable to reduce the target rotational speed Nt of the compressor or the rotational speed Nt ′ of the compressor motor.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a block diagram showing a motor driving device of a drum type washing machine in an embodiment of the present invention. In addition, the whole structure of the drum type washing machine in this Embodiment is the same as that shown in FIG.5 and FIG.6. Further, the basic operation and action of the drum type washing machine are the same as those of the conventional one, and the description thereof is omitted. The motor driving device which is a characteristic configuration of the drum type washing machine of the present invention will be described in detail below.

  The motor drive device has a function of controlling the drive of the drum motor 7, the fan motor for driving the circulation fan 14 (see FIG. 5), and the compressor motor for the heat exchange unit 15 (see FIG. 6). Only the part which is concerned with the drive of the drum motor 7 and the compressor motor 20 is shown. Each of the drum motor 7 and the compressor motor 20 is a permanent magnet synchronous motor including a stator having a three-phase winding and a rotor having a two-pole permanent magnet.

  The drum motor 7 is provided with three rotor position detection elements 21a, 21b, and 21c for detecting the rotor position. The rotor position detection elements 21a to 21c output a rotor position signal for every electrical angle of 60 degrees corresponding to the rotor magnetic pole position. The drum motor 7 is rotationally driven by the first inverter circuit 22. The first inverter circuit 22 is configured by connecting six switching elements 23 in a three-phase bridge, and a flywheel diode 24 is connected to each switching element 23 in parallel. The on / off state of each switching element 23 is PWM controlled by the first drive circuit 25.

  On the other hand, the compressor motor 20 is rotationally driven by the second inverter circuit 26. The compressor motor 20 has no rotor position detection element, and is position sensorless sine wave drive controlled based on a signal from the current detection means, for example. Similarly to the first inverter circuit 22, the second inverter circuit 26 is configured by connecting six switching elements 27 in a three-phase bridge, and a flywheel diode 28 is connected to each switching element 27 in parallel. The on / off state of each switching element 27 is PWM controlled by the second drive circuit 29.

  Actually, the motor drive device is also provided with a third inverter circuit and a third drive circuit for driving the fan motor for the circulation fan 14, but the configuration and operation thereof are the same as those of the second inverter circuit. Since it is the same as that of No. 26 and the 2nd drive circuit, illustration and description are omitted.

  The first drive circuit 25 and the second drive circuit 29 operate under the control of the control unit 30. A rotor position signal output from the rotor position detecting elements 21 a to 21 c of the drum motor 7 is input to the control unit 30. Based on this rotor position signal, the first drive circuit 25 performs PWM control of the on / off state of each switching element 23, thereby controlling the energization of the three-phase winding of the stator of the drum motor 7 and synchronously driving the rotor. Is done. Although not shown, the control unit 30 further includes a rotation speed detection unit that detects the rotation speed of the rotor, that is, the rotation speed Nd of the drum motor 7 based on the rotor position signals from the three rotor position detection elements 21a to 21c. The rotation speed detection unit detects the cycle every time the state of the three rotor position signals changes, and calculates the rotation frequency Nd of the drum motor 7 from the cycle.

  Supply of electric power to the first and second inverter circuits 22 and 26 is performed by an AC power supply 31, a short circuit 32, and a rectifier 33. That is, a DC voltage Vd is generated from the AC voltage Vs supplied from the AC power supply 31 by the short circuit 32 and the rectifier 33 and applied to the first and second inverter circuits 22 and 26.

The short circuit 32 includes a reactor 34 connected in series between the AC power supply 31 and the rectifier 33, a short circuit control element 35 connected in parallel to the AC power supply 31 via the reactor 34, and a current detection circuit 40. The The short-circuit control element 35 can be constituted by a power semiconductor switching element such as a diode bridge and IGBT, a bipolar transistor, or a MOSFET, for example. The current detection circuit 40 can be configured by inputting a voltage generated by a resistance element or the like to the control unit 30.

  The rectifier 33 includes a full-wave rectifier circuit 36 (rectifier circuit), and a series circuit of smoothing capacitors 37 and 38 is connected to the full-wave rectifier circuit 36 in parallel. The DC voltage Vd across the smoothing capacitors 37 and 38 is applied to the first inverter circuit 22 and the second inverter circuit 26, and the DC power is converted into three-phase AC power and supplied to the drum motor 7 and the compressor motor 20. Is done.

  In addition, a zero cross detection circuit 39 is provided, and the AC voltage Vs across the AC power supply 31 is input. The zero-cross detection circuit 39 outputs a zero-cross detection signal that switches from the High signal to the Low signal or from the Low signal to the High signal at the timing when the polarity of the alternating voltage Vs passes through the zero-cross point and changes the polarity.

  The control unit 30 also includes a DC voltage detection unit that detects the DC voltage Vd across the smoothing capacitors 37 and 38, and thus the DC voltage Vd applied to the first and second inverter circuits 22 and 26. Furthermore, the control unit 30 includes a short circuit signal generation unit, and generates a short circuit signal Ps for conducting the short circuit control element 35 of the short circuit 32 at least during a partial period of the dehydration process.

  The motor drive device having the above configuration is characterized by the operation of the short circuit 32. The short circuit 32 shorts the AC voltage Vs through the reactor 34 when the short control element 35 is turned on. In the short circuit state, the power of the AC voltage Vs is accumulated in the reactor 34, and the accumulated power is supplied to the rectifier 33 when the short circuit control element 35 is turned off. The supplied power is converted into direct current by the full-wave rectifier circuit 36, and the smoothing capacitors 37 and 38 are charged to increase the output direct current voltage Vd.

  In the drum type washing machine motor driving device of the present invention, in order to effectively perform such a boosting operation, the short circuit signal generation unit of the control unit 30 starts from the zero cross detection point detected by the zero cross detection circuit 39. The short circuit signal Ps is generated every half cycle of the power supply voltage Vs. Further, the pulse width Tw of the short circuit signal, the target rotational speed Nt of the drum motor 7, and the target voltage Vt of the DC voltage Vd set according to the target rotational speed Nt of the drum motor 7 are supplied to the current detection circuit 40. It is set based on the flowing current Id and the generation time Tp of the short circuit signal Ps.

  For example, if the current Id flowing through the current detection circuit 40 and the generation time Tp of the short circuit signal Ps are integrated to consume more than the reference power amount, the target rotational speed Nt of the drum motor 7 or the compressor motor The number of rotations Nt ′ of 20 is reduced, and control is performed so that energy exceeding the reference power amount is not generated. The heat generation of the short-circuit control element 35 is that the current Id flowing through the current detection circuit 40 is square and proportional to the generation time Tp of the short-circuit signal. Is possible.

  In particular, since the energy is maximized in the dehydration process that performs high-speed rotation, the amount of power until the end of dehydration is estimated in consideration of the remaining time until the end of dehydration, and the target rotational speed Nt of the drum motor 7 is reduced in advance. Then, by resetting the target voltage Vt of the DC voltage Vd necessary for the rotation of the drum motor 7, even if an external factor such as voltage fluctuation occurs, it can be used within the specifications of the parts, and the short circuit is performed in advance. Since it is not necessary to limit the signal generation time Tp, it is possible to operate with maximum efficiency.

An example of the operation of the short circuit 32 is shown in FIG. A short circuit signal Ps having a pulse width Tw is generated every half cycle starting from the zero crossing detection point of the voltage Vs of the AC power supply 31. During the High period of the short circuit signal Ps, the short circuit control element 35 is turned on, a short circuit current due to the AC voltage Vs flows, and electric power is accumulated in the reactor 34. When the short circuit signal Ps becomes Low, the auxiliary input current Ia based on the electric power accumulated in the reactor 34 is passed through the full-wave rectifier circuit 36. The auxiliary input current Ia is superimposed on the current due to the AC voltage Vs to form an input current to the full-wave rectifier circuit 36. By superimposing the auxiliary input current Ia, the DC voltage Vd across the smoothing capacitors 37 and 38 can be increased.

  FIG. 3A shows how the input current Ib to the full-wave rectifier circuit 36 increases due to the auxiliary input current Ia. For comparison, FIG. 3B shows the input current Ib to the full-wave rectifier circuit 36 when the short circuit 32 is not operated.

  In the dehydration process, as shown in FIG. 4, pressure increase control is performed in accordance with the target rotational speed Nt at each stage. FIG. 4 shows the target rotational speed Nt at each stage of the dehydration process. The abscissa indicates each stage of the process, and processing is performed in the order of preliminary dewatering, cloth peeling, and main dewatering. In the preliminary dehydration, Nt = 320 r / min, and when the cloth is peeled off, the rotation speed is lower, so that the pressure increase control is unnecessary. In addition, the driving of the compressor is started for the heat pump operation from the stage of cloth peeling.

  In this dehydration stage, control for gradually increasing the rotational speed is performed. At this stage, since the drum motor 7 and the compressor motor 20 are operated in parallel, the DC voltage Vd may decrease. Therefore, it is desirable to perform a boost operation when entering the dehydration stage. Therefore, the target voltage Vt to be boosted is changed according to the target rotation speed Nt of the drum motor 7. For example, boost control is not performed during a period in which the target rotational speed Nt is up to 420 r / min. During the period in which the target rotational speed Nt is 420 to 1600 r / min, the target voltage Vt is set to 300 V to control the pulse width Tw of the short circuit signal Ps. The reason why the boost control is not performed in the period up to 420 r / min is that the beat sound generated by the reactor 34 is conspicuous at a low rotational speed, and the necessity for boosting is low.

  In the drying process, control is performed to increase the rotational speed of the circulation fan 14 by increasing the pressure. The target voltage Vt at this time is about 250V, for example. As a result, even if the power supply is lowered or the compressor motor input is increased and the DC voltage is lowered, the circulation fan 14 can be stably operated.

  In the drying process, as in the dehydration process, in order to effectively perform the boosting operation, the short-circuit signal generation unit of the control unit 30 starts from the zero-cross detection point detected by the zero-cross detection circuit 39 as a half cycle of the power supply voltage Vs. A short circuit signal Ps is generated every time. The pulse width Tw of the short circuit signal Ps and the rotation speed Nt ′ of the compressor motor 20 are set based on the current Id flowing through the current detection circuit 40 and the generation time Tp of the short circuit signal Ps. Particularly in the drying process, since the operation time is long, the saturation temperature is estimated from the amount of electric power, and if the temperature exceeds the saturation temperature, the rotation speed Nt ′ of the compressor motor 20 or the rotation speed of the circulation fan motor is reduced. By setting the optimum pulse width Tw of the short circuit signal Ps and the current Id flowing through the current detection circuit 40, even if an external factor such as voltage fluctuation occurs, it can be used within the specifications of the component. In addition, since it is not necessary to limit the generation time Tp of the short circuit signal Ps in advance, it is possible to operate with maximum efficiency.

  Further, a thermistor capable of detecting the temperature in the substrate is provided, and when the heat generation of the short-circuit control element 35 or the like is converted by the value of the thermistor, the current Id flowing in the current detection circuit 40 is offset by offsetting the temperature in the substrate. Based on the generation time Tp of the short circuit signal Ps, the amount of power is estimated as described above, and detection can be performed with higher accuracy by setting the pulse width Tw of the short circuit signal Ps.

  As described above, the drum-type washing machine according to the present embodiment includes the short circuit 32 including the reactor 34 and the short-circuit control element 35, and the short-circuit signal Ps for conducting the short-circuit control element 35 is used as the zero cross of the voltage of the AC power supply 31. A detection point is generated as a starting point. The short circuit signal generator generates the short circuit signal Ps starting from the zero crossing detection point of the voltage of the AC power supply 31, the pulse width Tw of the short circuit signal Ps, the target rotational speed Nt of the drum motor 7, and the drum motor 7. The target voltage Vt of the DC voltage Vd set according to the target rotation speed Nt is set based on the current Id flowing through the current detection circuit 40 and the generation time Tp of the short circuit signal Ps.

  As a result, the DC voltage Vd supplied to the first and second inverter circuits 22 and 26 and the like can be boosted under appropriate conditions according to the situation, and the fan for driving the drum motor 7 and the circulation fan 14 can be controlled. It is possible to control the drive of the motor and the compressor motor 20 for the heat exchanging section with maximum efficiency.

  As described above, according to the drum type washing machine of the present invention, it is possible to stably supply a DC voltage to the inverter circuit, which is useful for a washing machine using a dehumidification drying method using a heat pump.

DESCRIPTION OF SYMBOLS 1 Washing machine main body 2 Water tank 3 Rotating drum 4 Clothes entrance / exit 5 Door 6 Through hole 7 Drum motor 8 Water injection line 9 Drainage line 10 Operation panel 11 Circulation ventilation path 12 Evaporator 13 Condenser 14 Circulation fan 15 Heat exchange part 16 Circulation Air introduction line 17 Blower line 18 Filter 20 Compressor motors 21a, 21b, 21c Rotor position detection element 22 First inverter circuit 23, 27 Switching element 24, 28 Flywheel diode 25 First drive circuit 26 Second inverter circuit 29 Second drive circuit 30 Controller 31 AC power supply 32 Short circuit 33 Rectifier 34 Reactor 35 Short circuit control element 36 Full-wave rectifier circuit (rectifier circuit)
37, 38 Smoothing capacitor 39 Zero cross detection circuit 40 Current detection circuit

Claims (3)

A rotating drum having a rotation center axis in a horizontal direction or an inclination direction, a water tank that rotatably holds the rotating drum, a drum motor that rotationally drives the rotating drum, and a rectifying circuit that rectifies AC from an AC power source A smoothing capacitor connected to the output terminal of the rectifier circuit; a first inverter circuit connected in parallel to the smoothing capacitor to drive and control the drum motor; one end of the AC power supply and the rectifier circuit input side A reactor connected in series to one end, a short-circuit control element having one end connected between one end of the reactor and one end on the rectifier circuit input side, and one end connected to the other end of the short-circuit control element Is connected to the other end of the AC power supply and the other end of the rectifier circuit input side, and has a short circuit having a current detection circuit for detecting a current passing through the short circuit control element, A zero-cross detection circuit for detecting a zero-cross of the voltage of the flow power supply, and a control unit for driving the first inverter circuit and controlling a series of washing operations, and the control unit detects the number of rotations of the drum motor. A rotation speed detector, a DC voltage detector for detecting a DC voltage Vd output across the smoothing capacitor, and a short-circuit signal generator for generating a short-circuit signal for conducting the short-circuit control element. The signal generation unit generates the short circuit signal from the zero cross detection point of the AC power supply voltage as a starting point at least during a partial period of the dehydration process, and the pulse width Tw of the short circuit signal and the target rotation speed Nt of the drum motor The target voltage Vt of the DC voltage Vd set according to the target rotational speed Nt of the drum motor is set to the current Id flowing through the current detection circuit and the current Drum type washing machine and sets on the basis of the generation time Tp of No. fault signal. At least a compressor, and a drying means that introduces air in the water tank through a circulation path to dehumidify and heat, a compressor motor that drives the compressor, and the smoothing capacitor are connected in parallel to the compressor. A second inverter circuit for driving and controlling the motor, the control unit is configured to drive the second inverter circuit together with the first inverter circuit, A short circuit signal is generated starting from the zero crossing detection point of the AC power supply voltage, and the pulse width Tw of the short circuit signal and the rotation speed Nt ′ of the compressor motor are determined based on the current Id flowing through the current detection circuit and the short circuit signal. The drum type washing machine according to claim 1, wherein the drum type washing machine is set based on the generation time Tp. A thermistor capable of detecting the temperature in the substrate is provided, and the control unit determines the pulse width Tw of the short circuit signal based on the value of the thermistor, the current Id flowing through the current detection circuit, and the generation time Tp of the short circuit signal. The drum type washing machine according to claim 1 or 2, which is set.