JP4985687B2 - Drum washing machine - Google Patents

Description

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

  An example of the structure of a drum-type washing / drying machine using a dehumidifying and drying system using a heat pump is shown in FIGS. FIG. 7 is a cross-sectional view showing the configuration of the main part of the drum-type washing machine, and FIG. 8 is an internal rear view thereof.

  In this 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 and drying machine is provided with a function of drying the 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, and dried by heating. Air is blown into the water tank 2 again. 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. 8, 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 the circulation fan 14, an air flow is generated in the circulation air passage 11, and the air in the rotary drum 2 containing the laundry is circulated from the water tank 3 to the circulation fan 14 through the through holes 6. High-temperature air that is always dried by being exhausted to the 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. Is done.

  The dried high-temperature air is sent from the circulation fan 14 to the air duct 17 to the water tank 3 and blown into the water tank 3. The high-temperature dry air blown into the water tank 3 enters the rotary drum 2 through the through holes 6 and escapes to the water tank 3 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 circulated in the air circulated through the circulation air passage 11, and the eyes of the evaporator and the condenser are circulated. Since clogging, clogging into the rotating part of the circulation fan 14, and a drying process such as accumulation on the inner surface of the circulation fan 14 are likely to be hindered, foreign substances in the circulation air may be trapped in the circulation air passage 11. A filter 18 for removal is provided.

  The motor driving device of the drum type washing and drying machine having the above-described configuration includes a DC voltage supply source for the inverter circuit for the drum motor 7 that rotationally drives the rotary drum 3 and the 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 that AC input or output power 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 / drying machine, is estimated and calculated from each motor current. It is disclosed that the power supply 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 / drying 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. Yes. 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 the drum motor or the compressor motor for the heat pump is stopped, the electric power of the AC voltage Vs accumulated in the reactor 34 is supplied to the rectifier 33 by the input of the short circuit signal, and the smoothing capacitors 37 and 38 are supplied. Terminal voltage Vd may increase and exceed the rating. Therefore, the smoothing capacitors 37 and 38 need to be composed of high withstand voltage or high capacity elements, which increases the cost.

  Therefore, an object of the present invention is to provide a drum type washing machine that does not require a high withstand voltage and high capacity smoothing capacitor and can be realized at low cost.

In order to solve the above problem, a drum type washing machine of the present invention includes a rotating drum having a rotation center axis in the horizontal or inclined direction, a water tub rotatably holding said rotary drum, before Symbol rotary drum A drum motor that rotates the motor, a load capable of consuming electric power, a rectifier circuit that rectifies AC from an AC power source , a smoothing capacitor connected to an output terminal of the rectifier circuit, and a parallel to the smoothing capacitor A first inverter circuit connected to drive and control the drum motor; a reactor connected in series to one end of the AC power supply and one end of the rectifier circuit; and one end of the reactor and one end of the rectifier circuit input side A short circuit having a short-circuit control element having one end connected in between and the other end connected to the other end of the AC power supply; and driving the first inverter circuit; And a control unit for controlling, the load includes a compressor motor having three windings are driven by the second inverter circuit, wherein the control unit includes a zero crossing detection circuit for detecting a zero cross of the voltage of the AC power source A rotation number detection unit for detecting the rotation number of the drum motor, a DC voltage detection unit for detecting a DC voltage Vd output across the smoothing capacitor, and a short circuit signal for conducting the short circuit control element. comprising a short-circuit signal generating section, together configured to drive the first inverter circuit and the second inverter circuit, the short signal generation unit, in some period of at least dehydration step, the short signal generate and, before Symbol DC voltage Vd, so that is can large required for obtaining the target rotation speed Nt of the drum motor, a pulse width Tw of the short signal Gosuru as to, when the drum motor is stopped, the input of the short signal leads the power accumulated in the reactor into two windings of the three windings included in the load, the compressor motor The control unit is controlled to consume power without rotating the motor .

  According to the drum-type washing machine of the present invention, a low-voltage drum-type washing machine is provided because a smoothing capacitor with a low withstand voltage and a low capacity is used without requiring a high-voltage withstanding and high-capacity smoothing capacitor. can do.

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

  That is, in the drum type washing machine of the present invention, the load can be constituted by a compressor motor for the heat pump. By adopting such a configuration, when the drum motor is stopped, the electric power stored in the reactor can be led to the load and consumed, so that the smoothing capacitor is realized with a low withstand voltage and low capacity element. Can reduce costs. In addition, since the regenerative current can be consumed using the existing load, it is not necessary to provide a separate load for current consumption, and can be realized at low cost.

  In the drum type washing machine of the present invention, the load may be configured by a motor that exhausts wet air in the water tank and that can rotationally drive a fan capable of introducing dry air into the water tank. it can. By adopting such a configuration, when the drum motor or the compressor motor for the heat pump is stopped, the electric power stored in the reactor can be led to the load and consumed, so that the smoothing capacitor has a low withstand voltage, This can be realized with a low-capacity element, and the cost can be reduced. In addition, since the regenerative current can be consumed using the existing load, it is not necessary to provide a separate load for current consumption, and can be realized at low cost.

  In the drum type washing machine of the present invention, the load may be constituted by a motor that drives a pump capable of introducing external water into the water tank. By adopting such a configuration, when the drum motor or the compressor motor for the heat pump is stopped, the electric power stored in the reactor can be led to the load and consumed, so that the smoothing capacitor has a low withstand voltage. This can be realized with a low-capacity element, and the cost can be reduced. In addition, since the regenerative current can be consumed using the existing load, it is not necessary to provide a separate load for current consumption, and can be realized at low cost.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(Embodiment)
FIG. 1 is a block diagram showing a motor driving device of a drum type washing / drying machine according to an embodiment of the present invention. In addition, the whole structure of the drum type washing / drying machine in the present embodiment is the same as that shown in FIGS.

  1 has a function of controlling driving of a drum motor 7, a fan motor for driving a circulation fan 14 (see FIG. 7), and a compressor motor for a heat exchanging unit 15 (see FIG. 8). In the figure, only the part related to the driving 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 a 2nd drive circuit, illustration and description are abbreviate | 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.

  A feature of increasing the output DC voltage Vd in the present embodiment will be described with reference to FIG.

  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 rectifying unit 33, and a short circuit control element 35 connected in parallel to the AC power supply 31 via the reactor 34. 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 rectifier 33 includes a full-wave rectifier circuit 36, 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 order to effectively perform such boosting operation, the short circuit signal generation unit of the control unit 30 generates the short circuit signal Ps every half cycle of the power supply voltage Vs starting from the zero cross detection point detected by the zero cross detection circuit 39. Generate. Further, the target voltage Vt with respect to the DC voltage Vd is set according to the target rotational speed Nt of the drum motor 7, and the pulse width Tw of the short circuit signal Ps is set based on the target voltage Vt and the detected value of the DC voltage Vd. The For example, the pulse width Tw is controlled so that the direct-current voltage Vd becomes a constant magnitude necessary for obtaining the target rotational speed Nt of the drum motor 7.

  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. 3 shows how the input current Ib to the full-wave rectifier circuit 36 increases due to the auxiliary input current Ia. For comparison, FIG. 4 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. 6, pressure increase control is performed according to the target rotational speed Nt at each stage. FIG. 6 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 boosting operation when entering the final 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 is conspicuous in the low rotational speed state, and the necessity for boosting is low.

  In the drying process, control is performed to increase the rotation speed of the circulation fan 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 circulating fan can be stably operated.

  Next, when the drum motor 7 or the compressor motor 20 for the heat pump is stopped due to disconnection of the connection lead, disconnection of the connector of the connection lead, occurrence of an instantaneous stop state of the power source, etc., it is stored in the reactor. Measures for guiding and consuming the generated power to the load will be described.

  In FIG. 1, the control unit 30 can detect the state of rotation of the drum motor 7 from the state of the first drive circuit 25. When the control unit 31 detects a signal for stopping the rotation of the drum motor 7, the control unit 31 sends a command to the second drive circuit 29 to drive the second inverter circuit 26. The second drive circuit 29 selectively controls on / off of the switching elements 27a to 27f of the second inverter circuit 26 based on a command from the control unit 30, whereby the power stored in the reactor 34 is 2 The electric power stored in the smoothing capacitors 37 and 38 is consumed by the compressor motor 20 for the heat pump using the inverter circuit 26.

  FIG. 5 shows the on / off operation of the switching element 27d.

  When the drum motor 7 is rotating, since the terminal voltage Vd of the smoothing capacitor is controlled to be constant, it does not change as shown in FIG.

  When the drum motor 7 is stopped, the electric power stored in the reactor 34 flows into the smoothing capacitors 37 and 38. At this time, in the present embodiment, when the control unit 30 detects a signal for stopping the rotation of the drum motor 7, it sends a drive command to the second drive circuit 29. The second drive circuit 29 selectively switches the switching element included in the second inverter circuit 26 based on a command from the control unit 30. For example, the switching element 27a is controlled to repeat the on / off operation at a predetermined duty ratio as shown in FIG. 5, and the switching element 27d is controlled to be turned on. Thereby, the electric power which is going to flow into the smoothing capacitors 27 and 28 flows to the compressor motor 20 for the heat pump via the switching element 27a. In addition, since the electric power flowing to the compressor motor 20 for heat pump flows to the windings 20a and 20b, only the electric power stored in the reactor 34 is consumed, and the compressor motor 20 for heat pump does not rotate. .

  As described above, the drum-type washing and drying machine of the present embodiment includes the second inverter circuit 26 and the second drive circuit 29, so that the connection lead wire is disconnected, the connection lead wire is disconnected, and the power supply is instantaneous. The electric power stored in the reactor 34 that is generated when the rotation of the drum motor 7 is stopped due to the occurrence of the stop state or the like can be led to the compressor motor 20 for heat pump and consumed. Therefore, since the electric power flowing into the smoothing capacitors 27 and 28 can be consumed, the smoothing capacitors 27 and 28 can be composed of low-breakdown voltage, low-capacitance and inexpensive elements, and the cost can be reduced.

  In the present embodiment, the switching elements 27a and 27d are operated in order to guide the electric power stored in the reactor 34 to the compressor motor 20 for the heat pump, but this combination of switching elements is an example. Any combination of other switching elements may be used as long as the electric power stored in the reactor 34 can be guided to two of the three windings 20a to 20c.

  In the present embodiment, the compressor motor 20 for heat pump is a motor for rotating the compressor motor 20, but may be other motors. For example, a motor capable of exhausting wet air in the water tank 2 and rotating the circulation fan 14 capable of introducing dry air into the water tank 2 or a pump capable of introducing external water into the water tank is driven. Even if it is a motor which carries out, it is realizable similarly. Further, the load for consuming the electric power stored in the reactor 34 is not limited to the motor. If the electric power stored in the reactor 34 can be consumed at least electrically connected to the smoothing circuit, the load of other configurations can be reduced. It may be a load.

  In the present embodiment, the electric power stored in the reactor 34 generated when the rotation of the drum motor 7 is stopped is consumed. However, the compressor motor 20 for the heat pump stops rotating. And when the motor capable of rotating the circulation fan 14 capable of introducing the dry air into the water tank 2 is stopped in rotation, the wet air in the water tank 2 is exhausted and stored in the reactor 34. If the generated power increases the terminal voltage Vd of the smoothing capacitor, the rotation of the drum motor 7 is not limited to the stopped mode. For example, the electric power stored in the reactor 34 can be consumed when the compressor motor 20 is stopped from the state where the compressor motor 20 for heat pump is rotating in the drying mode.

  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 and drying machine using a dehumidifying and drying method using a heat pump.

The block diagram which shows the motor drive device of the drum type washing-drying machine in one embodiment 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 The figure which shows the change of the input current to the full-wave rectifier circuit by the operation of the short circuit of the motor drive device The figure which shows the input current to the full-wave rectifier circuit in the motor drive device of the prior art example without a short circuit Diagram showing on / off operation of switching element 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-drying machine using the dehumidification drying system by the heat pump of a prior art example Inside rear view of the drum type washing and drying machine

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 Control unit 31 AC power source 32 Short circuit 33 Rectifier unit 34 Reactor 35 Short circuit control element 36 Full wave rectifier circuit 37, 38 Smoothing capacitor 39 Zero cross detection circuit

Claims (4)

A rotary drum having a rotation center axis in the horizontal or inclined direction, a water tub rotatably holding said rotary drum, a drum motor for rotating the pre-Symbol rotary drum, load and can be consumed electric power, AC A rectifying circuit for rectifying an alternating current from a power supply; a smoothing capacitor connected to an output terminal of the rectifying circuit; a first inverter circuit connected in parallel to the smoothing capacitor and drivingly controlling the drum motor; One end of an AC power source and one end of the rectifier circuit connected in series, and one end connected between the one end of the reactor and one end of the rectifier circuit input side, the other end is connected to the other end of the AC power source a short circuit with the connected short-circuit control element, to drive the first inverter circuit, and a control unit for controlling a series of washing operations, the load is second inverter Includes a compressor motor having a driven three windings by road, the control unit includes a zero crossing detection circuit for detecting a zero cross of the voltage of the AC power source, a rotational speed detector for detecting the rotational speed of the drum motor a DC voltage detection unit that detects a DC voltage Vd output to both ends of the smoothing capacitor, provided with a short-circuit signal generating section for generating a short-circuit signal for conducting the short-circuit control element, wherein the first inverter circuit and the together configured to drive the second inverter circuit, the short signal generation unit, in some period of at least dehydration step, the short signal forms raw previous SL DC voltage Vd, the target rotation of the drum motor so that the atmosphere is necessary to obtain the number Nt, so as to control the pulse width Tw of the short signal, when the drum motor is stopped, before The input of the short-circuit signal, leads to power accumulated in the reactor into two windings of the three windings having said load, said to consume power without rotating the compressor motor controller Drum type washing machine to control. A drying means for dehumidifying and and heated introducing air before Symbol in the water tank through the circulation path, the drying means includes a heat pump driven by a compressor motor, the front Symbol controller, said for the drying step 2. The drum type washing machine according to claim 1, wherein when the compressor motor is driven to rotate, control is performed so as to increase the DC voltage Vd by operating the short circuit. 3. The load includes a motor that exhausts wet air in the water tank and rotationally drives a fan capable of introducing dry air into the water tank . When the drum motor is stopped , the load is input by the short circuit signal. The drum type washing machine according to claim 1 or 2 , wherein the control unit is controlled so that electric power stored in a reactor is guided to a motor that rotationally drives the fan to consume electric power . The load includes a motor that drives a pump capable of introducing external water into the water tank . When the drum motor is stopped, the pump drives the pump with the electric power stored in the reactor by the input of the short circuit signal. The drum type washing machine according to claim 1 or 2 , wherein the controller is controlled so as to lead to a motor that consumes power and consume electric power .