KR20190127417A - Laundry treating appratus and controlling method thereof - Google Patents

Abstract

Disclosed are a clothes treating apparatus and an operation method thereof. According to the present invention, the clothes treating apparatus comprises: a plurality of motors configured to drive a drum, an air blowing fan, and a compressor of a heat pump; a plurality of inverters configured to supply power to the plurality of motors; and a control unit configured to control driving of the plurality of inverters and switching of a switch provided in each of the plurality of inverters based on control of vector-based three-phase pulse width modulation. The control unit is configured to detect a miss-detection state of a minimum valid vector within a control period of pulse width modulation to selectively use a first mode for estimating at least one current among three phases by using a phase current previously detected and a second mode for detecting a one phase current by limiting a variable width of three-phase pulse width modulation. When a peak of a detection current is generated while driven in the first mode or the second mode, the control unit controls the plurality of inverters using a third mode for limiting the use of the phase current previously detected and detecting at least a two phase current among three phases. According to the present invention, it is possible to accurately detect a phase current flowing in the motors of the clothes treating apparatus.

Description

Clothing treatment apparatus and its control method {LAUNDRY TREATING APPRATUS AND CONTROLLING METHOD THEREOF}

The present invention relates to a laundry treatment apparatus having a plurality of inverters and converters, and performing a drying function, and a control method thereof.

The apparatus for treating clothes refers to all devices that manage or process clothes, such as washing, drying, or removing wrinkles in clothes or bedding, such as at home or at a laundry. The clothes treating apparatus includes a washing machine, a dryer, a washing machine and a dryer, a refresher, an iron and a steamer.

A washing machine is a device for washing clothes or bedding. A dryer is a device that removes moisture such as clothes or bedding and dries it. The washing machine and dryer are both laundry and drying functions. A refresher is a device for refreshing clothes, such as removing odors and dust from clothes or preventing static electricity from occurring. An iron is a device for removing unnecessary wrinkles of clothing or for generating wrinkles necessary for clothing. Steamer is a device that sterilizes clothes or removes unnecessary wrinkles of clothes by using hot steam without contact with hot plate.

In particular, the dryer supplies hot air to a treatment object such as clothes or bedding put into a drum (or tub) to evaporate moisture contained in the treatment object. The moisture of the object to be evaporated from the drum and the air exiting the drum contain the moisture of the object to be treated at a high temperature and high humidity. At this time, the type of dryer is classified into a condensation type and an exhaust type according to a method of treating the high temperature and high humidity air.

The condenser dryer condenses the moisture contained in the hot humid air through heat exchange while circulating without discharging the hot humid air to the outside. In contrast, the exhaust dryer directly discharges hot and humid air to the outside. The condensation dryers have a structure for treating condensed water, and the exhaust dryers have a structural difference from each other in that they have a structure for exhausting air.

In recent years, the trend is that consumers demand a larger capacity dryer, and research on a dryer having a plurality of motors has been conducted to satisfy such a demand. In order to control a plurality of motors, it is necessary to detect the current in three phases. To this end, within one cycle of the pulse width modulation, the signal of the pulse width modulation of the three phases is varied so that the current detection timing is varied so that a current of at least two or more of the three phases can be detected.

In this case, electrical noise is generated due to distortion of the voltage vector, which causes a problem of emotional noise. Therefore, a current estimation algorithm can be used to reduce the noise. In this case, when a detected peak of the current is generated, the previous current value has a great influence on the current estimation, and the motor is stopped even though no overcurrent actually occurs. The problem occurs that occurs.

One object of an embodiment of the present invention for solving such a problem is to provide a clothing treatment apparatus and a method of operating the same, while minimizing emotional noise due to distortion of a voltage vector, and there is no error in starting performance even when a current peak occurs. It is.

In addition, another object according to an embodiment of the present invention, clothes processing apparatus and its operation method minimizes the operation error by accurately measuring the three-phase current of the motor in the clothes processing apparatus having a plurality of inverters and a single converter To provide.

Clothing processing apparatus according to an embodiment of the present invention for achieving the above object, the body forming an appearance; A drum containing a drying object and rotatably installed in the main body; A compressor of the heat pump compressing the refrigerant so that the moisture is removed from the heated air absorbed from the drying object, and the air from which the moisture is removed passes through the condenser and is thermally circulated to the drum; A blowing fan for generating a flow of the heated air or the dehumidified air; A plurality of motors for driving the drum, the blowing fan, and a compressor of the heat pump; A plurality of inverters for supplying power to the plurality of motors; And a control unit controlling driving of the plurality of inverters and controlling switching of switches provided in each of the plurality of inverters based on control of pulse width modulation based on a vector of three phases. Detects the undetected state of the minimum effective vector within the control period of the width modulation, and determines the variable width of the first mode and the three-phase pulse width modulation by estimating at least one current of the three phases using the previously detected phase current. Selectively uses a second mode for detecting the current of one phase, and limits the use of a previously detected phase current when the peak of the detection current occurs during driving in the first mode or the second mode. At least a part of the plurality of inverters is driven by using a third mode for detecting at least two phase currents.

In addition, in one embodiment, the peak generation of the detection current is detected by monitoring the degree of change in the detection current of the second time after the first time compared to the detection current of the first time entering the microcomputer of the clothing processing apparatus. It features.

In addition, in one embodiment, whether to switch to the third mode is a clothes processing apparatus, characterized in that after the motor driving the compressor of the heat pump is driven in accordance with the start of the drying operation of the main body.

Further, in one embodiment, the minimum effective vector is the sum of the dead time time of the inverter, the stabilization time after ringing occurrence, the interior permanent magnet (IPM) margin time, and the analog-to-digital conversion time at the time of switching of the switch. The undetected state of the effective vector is characterized in that the application time of the voltage vector is smaller than the minimum effective vector within the control period of the pulse width modulation.

The controller may be further configured to drive the plurality of inverters in the first mode while a minimum valid vector is detected for all three phases within the control period of the pulse width modulation.

In one embodiment, in the first mode, while detecting the minimum effective vector for all three phases, two currents of three phases are detected and the other current is obtained by estimating the equilibrium condition of the three phase currents. It is characterized by.

Also, in an embodiment, the controller may be configured to drive the inverter using the second mode when the minimum valid vector is not detected, and to respond to the release of the undetected state while driving in the second mode. By switching to the first mode from the second mode is characterized in that for driving the inverter.

Further, in one embodiment, the control unit, when the peak of the detection current in the first mode or the second mode, the inverter is switched to the third mode to drive the inverter, and if the predetermined time elapses of the minimum effective vector The inverter is driven in the first mode or the second mode according to the detection state.

In an embodiment, the second mode may include a first state in which one of three phases of current is detectable in an undetected state of the minimum effective vector, and at least two of three phases are in an undetected state of a minimum effective vector Is performed differently according to any one of the second states,

While the control unit drives the inverter in the second mode: in the first state, all of the variations of the pulse width modulation of the three phases are limited, and in the second state, the current is detected so that the current of one of the three phases is detected. The pulse width modulation of the three phases is symmetrically varied with a minimum variable width corresponding to the minimum effective vector.

The display device may further include a detector configured to detect at least one driving speed from among the plurality of motors, wherein the controller is configured to perform the first operation while at least one of the plurality of motors is driven at a speed lower than or equal to a reference value. And controlling the frequency or execution time of the mode to be smaller than the frequency or execution time of the second mode.

In addition, the laundry treatment apparatus according to another embodiment of the present invention for achieving the above object, the body to form an appearance; A drum containing a drying object and rotatably installed in the main body; A compressor of the heat pump compressing the refrigerant so that the moisture is removed from the heated air absorbed from the drying object, and the air from which the moisture is removed passes through the condenser and is thermally circulated to the drying drum; A blowing fan for generating a flow of the heated air or the dehumidified air; A first motor for driving the drum and the blower fan and a second motor for driving a compressor of the heat pump; First and second inverters respectively supplying power to the first motor and the second motor; A resistor element disposed between the DC link capacitor and the first inverter and the second inverter; And controlling the driving of the first inverter and the second inverter based on the current sampled through the resistor element, and controlling the driving of the first inverter and the second inverter, and controlling the driving of the first inverter and the second inverter based on a vector-based three-phase pulse width modulation control. It includes a control unit for controlling the switching of each provided switch. In addition, the control unit detects the undetected state of the minimum effective vector within the control period of the pulse width modulation, and varies the pulse width modulation of the first mode and the three phases to estimate the current of the other phase based on the sampled current. Limit the width to selectively use a second mode for detecting the current of one phase; limit the use of previously detected phase current when a peak of the detected current occurs during driving in the first mode or the second mode; At least a portion of the first inverter and the second inverter may be driven by using a third mode for detecting a current of at least two phases of a phase.

The control unit may drive the inverter using the first mode or the second mode for a predetermined time after the second motor is driven, and the second controller may be configured according to the start of the drying operation of the main body. After the motor is driven, it is determined whether to switch to the third mode.

According to an exemplary embodiment of the present invention, when the application time of the voltage vector is detected to be smaller than the minimum effective vector application time, at least one current of the three phases based on the effective vector may be detected. By selectively using the first mode estimated using the current and the second mode of detecting the current of one phase by limiting the variable width of the pulse width modulation of the three phases, noise due to distortion and ripple generation of the voltage vector can be eliminated. It is possible to accurately detect the phase current flowing through the motor of the clothes treating apparatus while being reduced.

In addition, if a peak of the detection current is generated while the motor is driving, it is limited to estimating the current of the other phase using the previously detected phase current and is switched to the third mode which detects the current of at least two of the three phases. This eliminates the control problem that the compressor motor of the heat pump stops when the actual current is not an overcurrent but the detected current is a peak value.

1 is a conceptual diagram of a clothes treating apparatus according to an embodiment of the present invention.
2A is a side view of a drum and an air circulation passage in a clothes treating apparatus according to an embodiment of the present invention.
2B is a perspective view of a base and parts mounted on the base in the clothes treating apparatus according to the embodiment of the present invention.
Figure 3a is a block diagram showing the components of the laundry treatment apparatus according to the present invention.
Figure 3b is a circuit diagram showing a control circuit of the laundry treatment apparatus according to the present invention.
FIG. 4 is an exemplary diagram for describing phase current detection of a motor for controlling driving of an inverter in FIG. 3B.
5 and 6 are flowcharts illustrating the detection of current by selectively using the first mode, the second mode, and the third mode when driving the inverter according to the present invention.
7A, 7B, 7C, and 7D are graphs for explaining that the compressor motor of the heat pump is stopped according to the use of the first mode or the second mode when a peak of the detected current is generated while driving the inverter in the present invention. admit.
FIG. 8 is a view for explaining an additional use of the third mode such that the driving of the compressor motor of the heat pump is not affected when a peak of the detected current is generated according to an embodiment of the present invention.
9A, 9B, and 9C are diagrams for describing an application time of a minimum effective vector and a detection time of a current in the present invention.
10A, 10B, 10C, 10D, 10E, 10F, 11A, and 11B are diagrams related to selectively using the first mode and the second mode in the non-detected state of the least effective vector in the present invention. admit.

EMBODIMENT OF THE INVENTION Hereinafter, the clothing processing apparatus which concerns on this invention is demonstrated in detail with reference to drawings. In the present specification, different embodiments are given the same or similar reference numerals for the same or similar components, and description thereof is replaced with the first description. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

When a component is referred to herein as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but other components may be present in between. It should be understood that it may. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

1 is a conceptual diagram of a clothes processing apparatus 1000 according to an embodiment of the present invention.

The cabinet 1010 forms an appearance of the clothes treating apparatus 1000. A plurality of metal plates constituting the front part, the rear part, the left and right side parts, the upper part and the lower part of the clothes processing apparatus 1000 are coupled to each other to form a cabinet 1010. The front opening 1011 is formed in the front portion of the cabinet 1010 so that the object to be processed may be introduced into the drum 1030.

The door 1020 is formed to open and close the front opening 1011. The door 1020 may be rotatably connected to the cabinet 1010 by a hinge 1021. The door 1020 may be formed of a partially transparent material. Therefore, even when the door 1020 is closed, the inside of the drum 1030 may be visually exposed through the transparent material.

The drum 1030 is rotatably installed in the cabinet 1010. The drum 1030 is formed in a cylindrical shape to accommodate the object to be treated. The drum 1030 is disposed so as to lie toward the front and rear direction of the clothes treating apparatus 1000 so as to receive the object to be treated through the front opening 1011. Unevenness may be formed along the circumference of the outer circumferential surface of the drum 1030.

The drum 1030 is formed with openings opened toward the front and the rear of the clothes processing apparatus 1000. The object to be treated may be introduced into the drum 1030 through the front opening. Hot dry air may be supplied into the drum 1030 through the rear opening.

The drum 1030 is rotatably supported by the front supporter 1040, the rear supporter 1050, and the roller 1060. The front supporter 1040 is disposed below the front of the drum 1030, and the rear supporter 1050 is disposed behind the drum 1030.

The roller 1060 may be installed at the front supporter 1040 and the rear supporter 1050, respectively. The roller 1060 is disposed directly below the drum 1030 and contacts the outer circumferential surface of the drum 1030. The roller 1060 is formed to be rotatable, and an elastic member such as rubber is coupled to the outer circumferential surface of the roller 1060. The roller 1060 is rotated in a direction opposite to the rotation direction of the drum 1030.

Heat pump cycle devices 1100 may be installed below the drum 1030. Here, the lower side of the drum 1030 means a lower portion in the space between the outer circumferential surface of the drum 1030 and the inner circumferential surface of the cabinet 1010. The heat pump cycle devices 1100 refer to devices that constitute a cycle to sequentially evaporate-compress-condense-expand the refrigerant. Upon operation of the heat pump cycle apparatuses 1100, the air is hot dried while sequentially exchanging heat with the evaporator 1110 and the condenser 1130.

Inlet duct 1210 and outlet duct 1220 form a flow path for circulating hot dry air formed by heat pump cycle devices 1100 to drum 1030. The inlet duct 1210 is disposed at the rear of the drum 1030, and the air dried by the heat pump cycle devices 1100 is supplied to the drum 1030 through the inlet duct 1210. The outlet duct 1220 is disposed at the front lower side of the drum 1030, and the air that has dried the object to be processed is recovered again through the outlet duct 1220.

A base 1310 is installed below the heat pump cycle devices 1100. The base 1310 refers to a molded body that supports various components of the clothes treating apparatus 1000, including the heat pump cycle apparatuses 1100, from below.

The base cover 1320 is installed between the base 1310 and the drum 1030. The base cover 1320 is formed to cover the heat pump cycle devices 1100 mounted on the base 1310. When the side wall of the base 1310 and the base cover 1320 are combined, an air circulation flow path is formed. Some of the heat pump cycle devices 1100 are installed in the air circulation passage.

The bucket 1410 is disposed on the upper left side or the upper right side of the drum 1030. Here, the upper left or upper right side of the drum 1030 means the upper left or upper right portion in the space between the outer circumferential surface of the drum 1030 and the inner circumferential surface of the cabinet 1010. In FIG. 1, a bucket 1410 is shown disposed on the upper left side of the drum 1030. The water container 1410 collects condensate.

Condensed water is generated when the air that has dried the object to be treated is recovered through the outlet duct 1220 and heat exchanged with the evaporator 1110. More specifically, when the temperature of the air decreases due to heat exchange in the evaporator 1110, the amount of saturated water vapor that the air may contain decreases. Since the air recovered through the outlet duct 1220 contains moisture exceeding the amount of saturated water vapor, condensed water is inevitably generated.

The water pump 1440 (see FIG. 3) is installed in the clothes processing apparatus 1000. The water pump 1440 raises the condensate to the water tank 1410. The condensate is collected in the bucket 1410.

The bucket cover 1420 may be disposed at one corner of the front portion of the clothes processing apparatus 1000 to correspond to the position of the bucket 1410. The bucket cover 1420 is formed to be gripped by hand and is disposed on the front surface of the clothes processing apparatus 1000. When the bucket cover 1420 is pulled to empty the condensed water collected in the bucket 1410, the bucket 1410 is withdrawn from the bucket supporting frame 1430 together with the bucket cover 1420.

The bucket supporting frame 1430 is formed to support the bucket 1410 in the cabinet 1010. The bucket supporting frame 1430 extends along the insertion or withdrawal direction of the bucket 1410 to guide the insertion or withdrawal of the bucket 1410.

The input / output panel 1500 may be disposed beside the bucket cover 1420. The input / output panel 1500 may include an input unit 1510 for receiving a selection of a clothing processing course from a user, and an output unit 1520 for visually displaying an operating state of the clothing processing apparatus 1000. The input unit 1510 may be formed of a jog dial, but is not limited thereto. The output unit 1520 may be configured to visually display an operating state of the clothes processing apparatus 1000, and the clothes processing apparatus 1000 may include a separate configuration for an acoustic display in addition to the visual display.

The controller 1600 is configured to control the operation of the clothing processing apparatus 1000 based on a user's input applied through the input unit 1510. The controller 1600 may include a printed circuit board and elements mounted on the printed circuit board. When the user inputs a control command such as selecting a clothes processing course through the input unit 1510 or operating the clothes processing apparatus 1000, the controller 1600 controls the operation of the clothes processing apparatus 1000 according to a preset algorithm. do.

The printed circuit board constituting the controller 1600 and the elements mounted on the printed circuit board may be disposed on the upper left side or the upper right side of the drum 1030. In FIG. 1, the printed circuit board is disposed on the upper right side of the drum 1030 opposite to the water tank 1410 on the upper side of the drum 1030. The condensate is collected in the bucket 1410, the heat pump cycle devices 1100 and the ducts 1210, 1220 and 1230 contain moisture-flowing air and electrical products such as printed circuit boards and components. Given the vulnerability to water, the printed circuit board and the elements are preferably spaced away from the bucket 1410 or the heat pump cycle devices 1100 as far as possible.

Hereinafter, the drum 1030 and the air circulation passage will be described.

2A is a side view of the drum 1030 and the air circulation passage. In FIG. 2A, the left side corresponds to the front side F of the drum 1030, and the right side corresponds to the rear side R of the drum 1030.

In order to dry the clothes and the like (processing object) put into the drum 1030, the air is dried at high temperature and supplied to the drum 1030, and the air from which the clothes are dried is recovered again to remove moisture from the air. shall. In order to repeat this process in a condensation dryer, air must be continuously circulated through the drum 1030. The air is circulated through the drum 1030 and the air circulation passage.

The air circulation passage is formed by an inlet duct 1210, an outlet duct 1220, and a connecting duct 1230 disposed between the inlet duct 1210 and the outlet duct 1220. Each of the inlet duct 1210, the outlet duct 1220, and the connecting duct 1230 may be formed by combining a plurality of members.

The inlet duct 1210, the drum 1030, the outlet duct 1220 and the connecting duct 1230 are sequentially connected based on the flow of air, and the connecting duct 1230 is again connected to the inlet duct 1210 to waste oil. Form a closed flow path.

The inlet duct 1210 extends from the connecting duct 1230 to the rear side of the rear supporter 1050. The rear surface of the rear supporter 1050 refers to the surface facing the rear of the clothes processing apparatus 1000. Since the drum 1030 and the connecting duct 1230 are arranged to be spaced apart from each other along the vertical direction, the inlet duct 1210 is toward the rear of the drum 1030 from the connecting duct 1230 disposed below the drum 1030. It may have a structure extending in the vertical direction.

The inlet duct 1210 is coupled to the backside of the rear supporter 1050. Holes are formed in the rear surface of the rear supporter 1050. Therefore, the hot dry air is supplied from the inlet duct 1210 into the drum 1030 through the hole formed in the rear supporter 1050.

The outlet duct 1220 is disposed below the front supporter 1040. Since the front opening for injecting a treatment object should be formed in front of the drum 1030, the outlet duct 1220 is disposed below the front of the drum 1030.

Outlet duct 1220 extends from front supporter 1040 to connecting duct 1230. Like the inlet duct 1210, the outlet duct 1220 may extend vertically, but the length of the outlet duct 1220 extending in the vertical direction is shorter than that of the inlet duct 1210. Air dried in the drum 1030 is recovered to the connecting duct 1230 through the outlet duct 1220.

An evaporator 1110 and a condenser 1130 of the heat pump cycle devices 1100 are installed in the connection duct 1230. In addition, a circulation fan 1710 for supplying hot dry air to the inlet duct 1210 is also installed in the connection duct 1230. An evaporator 1110 is disposed upstream of the condenser 1130 based on the flow of air, and a circulation fan 1710 is disposed downstream of the condenser 1130. The circulation fan 1710 generates air in a direction of sucking air from the condenser 1130 and supplying the air to the inlet duct 1210.

Next, the components under the drum 1030 will be described.

2B is a perspective view of the base 1310 and components mounted to the base 1310.

The base 1310 is formed to support the mechanical elements of the garment treatment apparatus 1000, including the heat pump cycle devices 1100. The base 1310 forms a number of mounts 1313 for mounting of the mechanical elements. Mounting portion 1313 refers to an area provided for mounting of mechanical elements. Each mounting portion 1313 may be partitioned from each other by a step of the base 1310. Hereinafter, the components will be described in the counterclockwise direction with respect to the connection duct 1230.

Unlike the drum 1030 disposed at the center of the clothes processing apparatus 1000 in the left and right directions, the air circulation path is eccentrically disposed to the left or the right of the drum 1030. In FIG. 2B, the air circulation passage is illustrated as being disposed on the lower right side of the drum 1030. Eccentric arrangement of the air circulation passage is for efficient drying of the object to be treated and for efficient placement of the parts.

The inlet portion 1311 of the connecting duct 1230 is disposed below the outlet duct 1220 and is connected with the outlet duct 1220. The inlet portion 1311 of the connecting duct 1230 is formed with the outlet duct 1220 to guide the air in an inclined direction. For example, in FIG. 2B the inlet portion 1311 of the connecting duct 1230 narrows down. In particular, the left side surface of the inlet portion 1311 is formed to be inclined to the lower right side. If the air circulation passage is disposed on the lower left side of the drum 1030, the right side of the inlet portion 1311 will be inclined to the lower left side.

The evaporator 1110, the condenser 1130, and the circulation fan 1710 are sequentially disposed downstream of the inlet portion 1311 based on the flow of air. When the clothes processing apparatus 1000 is viewed from the front, the condenser 1130 is disposed behind the evaporator 1110, and the circulation fan 1710 is disposed behind the condenser 1130. The evaporator 1110, the condenser 1130 and the circulation fan 1710 are mounted to respective mounting portions 1313 provided in the base 1310.

The base cover 1320 may be installed on the evaporator 1110 and the condenser 1130. The base cover 1320 may be composed of a single member or a plurality of members. When the base cover 1320 is formed of a plurality of members, the base cover 1320 may include a front base cover 1321 and a rear base cover 1322.

The base cover 1320 is formed to cover the evaporator 1110 and the condenser 1130. The base cover 1320 may be coupled to a step or sidewall of the base 1310 formed on the left and right sides of the evaporator 1110 and the condenser 1130 to form a part of the connection duct 1230.

The circulation fan 1710 is surrounded by the base 1310 and the base cover 1320. An outlet portion 1312 of the connecting duct 1230 is formed above the circulation fan 1710. The outlet portion 1312 of the connecting duct 1230 is connected with the inlet duct 1210. The hot dry air formed by the heat pump cycle apparatuses 1100 is supplied to the drum 1030 through the inlet duct 1210.

A water pump 1440 is installed at one side of the condenser 1130 (or one side of the circulation fan 1710). The water pump 1440 is formed to transfer the condensed water collected to the mounting portion in which the water pump 1440 is installed.

The base 1310 is formed to drain the condensed water generated during the operation of the heat pump cycle devices 1100 to a mounting portion in which the water pump 1440 is installed. For example, the bottom surface of the mounting portion 1313 may be inclined to allow the condensate to flow to the mounting portion in which the water pump 1440 is installed, or the step height of the mounting portion in which the water pump 1440 is installed may be partially low.

By the structure of the base 1310, the condensed water collected by the mounting unit 1313 in which the water pump 1440 is installed may be transferred to the water tank 1410 by the water pump 1440. In addition, the condensed water may be transferred by the water pump 1440 and used to clean the evaporator 1110 or the condenser 1130.

One side of the water pump 1440 may be a compressor 1120 and a compressor cooling fan 1720 for cooling the compressor 1120. The compressor 1120 is an element constituting the heat pump cycle devices 1100, but does not need to be installed in the air circulation passage because it does not directly exchange heat with air. Rather, since the compressor 1120 may interfere with the flow of air if the compressor 1120 is installed in the air circulation passage, the compressor 1120 is preferably installed outside the air circulation passage as shown in FIG. 2B.

The compressor cooling fan 1720 generates wind toward the compressor 1120 or in the direction of sucking air from the compressor 1120. When the temperature of the compressor 1120 is lowered by the compressor cooling fan 1720, the compression efficiency is improved.

The gas-liquid separator 1140 is installed upstream of the compressor 1120 based on the flow of the refrigerant. The gas-liquid separator 1140 separates the gaseous phase and the liquid phase of the abnormal refrigerant introduced into the compressor 1120 so that only the gas phase flows into the compressor 1120. This is because the liquid phase causes a failure of the compressor 1120 and a decrease in efficiency.

The refrigerant is evaporated (liquid-> gas) while absorbing heat from the evaporator 1110, and the refrigerant is brought into the compressor 1120 at a low temperature and low pressure gas state. When the gas-liquid separator 1140 is installed upstream of the compressor 1120, the refrigerant may pass through the gas-liquid separator 1140 before entering the compressor 1120. In the compressor 1120, the refrigerant in the gas phase is compressed and flows to the condenser 1130 at a high temperature and high pressure. In the condenser 1130, the refrigerant liquefies while releasing heat. The liquefied high pressure refrigerant is depressurized in an expander (not shown). The low temperature low pressure liquid refrigerant enters the evaporator 1110.

The hot dry air is supplied to the drum 1030 through the inlet duct 1210 to dry the object to be treated. The hot dry air evaporates the moisture of the object to be treated and becomes hot and humid air. The high temperature and high humidity air is recovered through the outlet duct 1220, and receives the heat of the refrigerant through the evaporator 1110 to become low temperature air. As the temperature of the air decreases, the amount of saturated water vapor in the air decreases, and the steam contained in the air condenses. Subsequently, the low temperature dry air receives heat of the refrigerant through the evaporator 1110, and becomes the high temperature dry air and is supplied to the drum 1030 again.

Next, referring to FIG. 3A, the laundry treatment apparatus according to the present invention includes an input unit 310, an output unit 320, a communication unit 330, a detection unit 340, an inverter 350, a motor 360, and a converter ( 370, a control unit 380, a valve unit 391, a pump unit 392 and the auxiliary heater unit 393 may be included.

The input unit 310 may receive a control command related to an operation of the clothes treating apparatus from a user. The input unit 310 may be configured as a plurality of buttons or may be configured as a touch screen.

In detail, the input unit 310 may be formed as a control panel that receives a selection of an operation mode of the clothes processing apparatus or receives an input related to execution of the selected operation mode.

The output unit 320 may output information related to the operation of the clothes treating apparatus. The output unit 320 may include at least one display.

The information output by the output unit 320 may include information related to an operating state of the clothes treating apparatus. That is, the output unit 320 may output information related to at least one of the selected driving mode, whether a failure occurs, the driving completion time, and the amount of storage accommodated in the drum.

In one embodiment, the output unit 320 may be a touch screen integrally formed with the input unit 310.

The communication unit 330 may communicate with an external network. The communication unit 330 may receive a control command related to the operation of the clothes treating apparatus from an external network. For example, the communication unit 330 may receive an operation control command of the clothes processing apparatus sent from the external terminal through the external network. As a result, the user can remotely control the clothes treating apparatus.

In addition, the communication unit 330 may transmit information related to the operation result of the clothes treating apparatus to a predetermined server through an external network.

In addition, the communication unit 330 may communicate with other electronic devices in order to establish an Internet of Things (IOT) environment.

The sensor 340 may detect information related to the operation of the clothes treating apparatus.

In detail, the detector 340 may include at least one of a current sensor, a voltage sensor, a vibration sensor, a noise sensor, an ultrasonic sensor, a pressure sensor, an infrared sensor, a visual sensor (camera sensor), and a temperature sensor.

In one example, the current sensor of the sensing unit 340 may detect a current flowing to one point of the control circuit of the clothing treatment apparatus.

In another example, the temperature sensor of the sensing unit 340 may detect the temperature in the drum.

As described above, the sensing unit 340 may include at least one of various types of sensors, and the type of sensor included in the clothes treating apparatus is not limited. In addition, the number or installation position of each sensor can also be variously designed according to the purpose.

The inverter 350 includes a plurality of inverter switches, converts the smoothed DC power supply (Vdc) into three-phase AC power supplies (va, vb, vc) of a predetermined frequency by outputting them to a motor. can do.

Referring to FIG. 3A, the clothes treating apparatus according to the present invention may include a plurality of inverters 351, 352, and 353, and each inverter may supply power to the plurality of motors 361, 362, and 363. have.

In FIG. 3A, the clothes treating apparatus includes three inverters 351, 352, and 353, and each inverter supplies power to three motors 361, 362, and 363. It is not limited to this.

In detail, the first inverter 351 may supply power to the first motor 361 that rotates the drum 301, and the second inverter 352 may rotate the second motor 362 that rotates the blower fan 302. ), And the third inverter 353 may supply power to the third motor 363 driving the compressor of the heat pump 303.

The rotating shaft of the first motor 361 and the rotating shaft of the drum 301 are connected by a belt (not shown), and the first motor 361 may transmit the rotating force to the drum 301 side through the belt.

The motor 360 may be a BLDC motor capable of speed control based on the speed command value, or may be a constant speed motor that does not perform speed control. In one example, the first motor for rotating the drum, the third motor for driving the compressor may be configured as a BLDC motor, the second motor for rotating the blowing fan may be configured as a constant speed motor.

Inverters 351, 352, and 353 each have a pair of upper arm switches Sa, Sb, Sc, and lower arm switches S'a, S'b, S'c connected in series with each other. The lower arm switches are connected in parallel with each other (Sa & S'a, Sb & S'b, Sc & S'c). Diodes are connected in anti-parallel to each of the switches Sa, S'a, Sb, S'b, Sc and S'c.

That is, the first upper arm switch Sa and the first lower arm switch S'a implement the first phase, and the second upper arm switch Sb and the second lower arm switch S'b implement the second phase. The third upper arm switch Sc and the third lower arm switch S'c may implement the third phase.

In an embodiment, the inverter 350 may include a shunt resistor corresponding to at least one of the first to third phases.

Specifically, a first shunt resistor may be connected to one end of the first lower arm switch S'a of the first switch pairs Sa and S'a, and similarly, to one end of the second lower arm switch S'b. The second shunt resistor may be connected, and a third shunt resistor may be connected to one end of the third lower arm switch S'c. The first to third shunt resistors are not essential components, and only some of the three shunt resistors may be provided as necessary.

In another embodiment, the inverter 350 may be connected to a common shunt resistor commonly connected to the first to third phases.

Meanwhile, the switches in the inverters 351, 352, and 353 perform on / off operations of the switches based on the inverter switching control signal generated by the controller 380. As a result, the three-phase AC power having a predetermined frequency is output to the motor 360.

The controller 380 may control the switching operation of the inverters 351, 352, and 353 based on the sensorless method. In detail, the controller 380 may control the switching operation of the inverter 350 using the motor phase current detected by the current sensor of the detector 340.

The controller 380 outputs an inverter switching control signal to the inverters 351, 352, 353 in order to control the switching operation of the inverters 351, 352, 353. Here, the inverter switching control signal is composed of a switching control signal of the pulse width modulation (PWM).

As shown in Figure 3a, the laundry treatment apparatus according to the present invention includes a plurality of inverters. 3A, three motors 360 and three inverters 350 for driving the compressor of the drum 301, the blower fan 302, and the heat pump 303 are not limited thereto. For example, when the drum 301 and the blower fan 302 are driven by one motor and the compressor of the heat pump 303 is driven by another motor, two motors and two inverters may be used. It may also include.

As the number of inverters increases as the number of inverters increases, the present invention proposes a clothes treating apparatus having a converter 370.

The converter 370 converts commercial AC power into DC power and outputs the DC power. In more detail, the converter 370 may convert the single-phase AC power or the three-phase AC power into DC power to output the same. The internal structure of the converter 370 also varies according to the type of commercial AC power source.

On the other hand, the converter 370 may be made of a diode or the like without a switching element, and may perform rectification without a separate switching operation.

For example, in the case of single phase AC power, four diodes may be used in the form of a bridge, and in the case of three phase AC power, six diodes may be used in the form of a bridge.

On the other hand, the converter 370, for example, may be used a half-bridge converter is connected to two switching elements and four diodes, in the case of a three-phase AC power supply, six switching elements and six diodes may be used. .

When the converter 370 includes a switching element, the boosting operation, the power factor improvement, and the DC power conversion may be performed by the switching operation of the switching element.

The valve 391 may be disposed at one point of the flow path installed in the clothes treating apparatus to intercept the flow of the flow path. The pump unit 392 may provide a driving force for supplying gas or liquid to the flow path.

In addition, the auxiliary heater 393 may be installed separately from the heat pump to supply heat to the drum. The auxiliary heater unit 393 may heat air introduced into the drum.

The controller 380 may control the components included in the clothes treating apparatus.

First, the controller 380 may generate at least one of a power command value, a current command value, a voltage command value, and a speed command value corresponding to the motor 360 to control the rotation of the motor 360.

In detail, the controller 380 may calculate the power or the load of the motor 360 based on the output of the detector 340. In detail, the controller 380 may calculate the rotational speed of the motor by using the phase current value detected by the current sensor of the detector 340.

In addition, the controller 380 may generate a power command value corresponding to the motor, and calculate a difference between the generated power command value and the calculated power. In addition, the controller 380 may generate the speed command value of the motor based on the difference between the power command value and the calculated power.

 In addition, the controller 380 may calculate a difference between the speed command value of the motor and the calculated rotation speed of the motor. In this case, the controller 380 may generate a current command value applied to the motor based on the difference between the speed command value and the calculated rotation speed.

In an example, the controller 380 may generate at least one of a q-axis current command value and a d-axis current command value.

The controller 380 may convert the phase current of the stationary coordinate system or the phase current of the rotational coordinate system based on the phase current detected by the current sensor. The controller 380 may generate a voltage command value applied to the motor by using the converted phase current and the current command value.

By performing such a process, the controller 380 generates an inverter switching control signal according to the PWM method.

The controller 380 may adjust the duty ratio of the switch included in the inverter by using the inverter switching control signal.

In addition, the controller 380 may control at least one of a drum, a blowing fan, and a heat pump based on a control command input by the input unit 310.

In one example, the controller 380 may control the rotation pattern of the drum based on a user input applied to the input unit 310.

In another example, the controller 380 may control the rotational speed or the operation time of the blowing fan based on a user input applied to the input unit 310.

In another example, the controller 380 may control the output of the heat pump to adjust the temperature in the drum based on a user input applied to the input unit 310.

In the following Figure 3b is described a control circuit of the laundry treatment apparatus according to the present invention.

The control circuit included in the clothes treating apparatus according to the present invention includes a converter 370, a dc terminal voltage detector B, a smoothing capacitor Vdc, a plurality of shunt resistors, a plurality of inverters 351, 352, and 353, a plurality of inverters. It may further include a diode (D, BD), the reactor (L) and the like.

The reactor L is disposed between the commercial AC power supply Vin and the converter 370 to perform power factor correction or step-up operation. In addition, the reactor L may perform a function of limiting harmonic currents due to the high speed switching of the converter 370.

The converter 370 converts the commercial AC power Vin passed through the reactor L into a DC power source and outputs the DC power. In the drawing, a commercial AC power source Vin is illustrated as a single phase AC power source, but may be a three phase AC power source.

The smoothing capacitor Vdc smoothes the input power and stores it. In the drawing, one device is illustrated as a smoothing capacitor Vdc, but a plurality of devices are provided, and device stability may be ensured. On the other hand, both ends of the smoothing capacitor (Vdc), because the DC power is stored, it may be referred to as a dc terminal or a dc link terminal.

The controller 380 may detect the input current is input from the commercial AC power supply 405 using the shunt resistor installed in the converter 370. In addition, the controller 380 may detect the phase current of the motor by using the shunt resistor Rin installed in the inverter 350.

The clothes treating apparatus 100 according to the present invention does not have an additional sensor for detecting the rotor position of the drum motor 361, that is, controls the drum motor 361 by a sensorless method. The drive of the inverter 351 is controlled by controlling the switching element in the inverter 351 which supplies electric power to the drum motor 361.

On the other hand, the drum motor 361 may drive the drum 301 together with the blower fan 302 that generates a flow of heated air or air from which moisture is removed. That is, the drum motor 361 may provide rotational force not only to the drum 301 but also to the blowing fan 302 at the same time. To this end, a plurality of output shafts (or rotating shafts) may be provided in one drum motor 361, in which case the driving force of the drum motor 361 is driven by a pulley and a belt connected to each output shaft. 301 and blowing fan 302 are delivered. In this case, the drum 301, the drum 301, and the blowing fan 302 may be rotated at different rotational speeds.

However, the structure is not limited thereto, and as described above, in the structure in which a separate fan motor 362 for driving the blowing fan 302 is added, embodiments of the present disclosure may be applied. . In this case, the inverter 351 for supplying driving power to the drum motor 361 and the inverter 352 for supplying driving power to the fan motor 362 and the heat pump 303 according to the control signal of the controller 380. Inverters 353 for supplying driving power to the compressor are provided separately.

4 is an exemplary diagram for describing phase current detection of a motor for controlling driving of an inverter in FIG. 3B.

Referring to Figure 4, the front of the inverter 350, for example, the drum inverter of the laundry treatment apparatus 100 according to the present invention is provided with a boost converter (for example, PFC circuit), DC link capacitor, reactor (L) do. In addition, one resistor element (eg, a shunt resistor) may be included between the DC link capacitor and the switch of the inverter.

The inverter 350 includes three pairs of switches switched according to a switching signal transmitted from the controller. The inverter 350 converts the DC power stored in the DC link capacitor into AC power, and outputs the AC power to the motor 361.

Although not shown, the control circuit includes a voltage detector for detecting a voltage applied to the motor 361, an input current detector for detecting at least two phases of a current input to the motor 361, and a motor 361. An output current detection unit for detecting the current output from the) may be further included. The detected current or voltage is transmitted to the controller 380 and used to drive the motor 360 and the inverter 350.

The controller 380 controls the switching operation of the switches provided in the inverter so that the AC power converted by the inverter 350 is appropriately provided to the connected motor 360. For this purpose, the control unit 380 detects the current of the three phases of the motor based on the signal of the three-phase pulse width modulation PWM outputted to the inverter 350. The vector operation is performed based on the detected three-phase current, and the three-phase voltage is determined. Based on the three-phase PWM signal, the three-phase PWM signal is generated, so that the switching elements of the switch in the inverter 350, that is, six power MOSFETs By outputting a gate signal to each gate, the switching operation (switching time, interval, etc.) of the switch in the inverter 350 is controlled. Therefore, it is very important to accurately measure the three-phase current of the motor for the control of the inverter 350.

The control unit 380 of the laundry treatment apparatus according to an embodiment of the present invention controls the operation of the switch in the inverter 350 by controlling the pulse width modulation based on the effective vector, and within one cycle control period of the pulse width modulation. The first mode of estimating at least one current of the three phases using a previously detected phase current and the variable width of the pulse width modulation of the three phases by limiting the variable width of the one phase according to whether or not the minimum effective vector is detected A second mode for detecting current is selectively used. Specifically, the first mode of detecting the current of one phase by operating in the first mode or by limiting the variation of the pulse width modulation of the three phases or minimizing the variable width depending on whether the application time of the effective voltage is less than the minimum effective vector. The two modes may be used to drive at least some of the plurality of inverters 351, 352, and 353 connected to one converter.

Here, the minimum effective vector means the sum of the dead time time of the inverter, the stabilization time after the ringing occurs, the margin time of the interior permanent magnet (IPM), and the analog-to-digital conversion time when switching the switch in the inverter. Specifically, the minimum effective vector Tmin may be calculated as follows.

When the vector and application time of the three phases are determined, the controller 380, that is, the microcomputer, outputs a PWM signal. The PWM signal output from the microcomputer generates dead time (Tdead) 2us by applying dead-time to prevent arm short of the IPM. In addition, when the PWM signal is supplied to the motor via the IPM, the interior permanent magnet (IPM) delay and the interior permanent magnet (IPM) delay margin time 1.5us also occur.

In addition, a stabilization time (Tsteady) 3us occurs after a ringing occurs during switching of the switch in the inverter 350. Therefore, for one shunt current detection, after the effective vector is applied, the analog-to-digital conversion must be started after a delay of at least 6.5us.

Therefore, finally, the effective vector within the PWM control period, taking into account the dead time (2us), Steady Time (3us), IPM Margin (0.5us), AD Conversion Time (2us) and Margin (0.5us) shown above. In order to detect the three-phase current of, the effective vector application time of at least 8 us should be secured.

When the application time of the three-phase voltage vector is greater than the minimum effective vector Tmin, the phase current may be sensed at an intermediate point of the voltage vector. On the other hand, if at least some of the voltage vectors of the three phases are smaller than the minimum effective vector Tmin, a dead zone occurs, and sampling of the phase current becomes impossible. In this case, the controller recognizes that the minimum valid vector is not detected.

Accordingly, the non-detected state of the minimum effective vector Tmin means that an application time of at least one voltage vector within the control period of the pulse width modulation is less than the application time of the minimum effective vector so that a three-phase current cannot be detected. It means that it is detected.

As such, when an undetected state of the minimum effective vector is detected, phase current cannot be sensed, so that the minimum effective vector is secured by varying the phase of at least some of the three-phase pulse width modulation (for example, shifting in both directions or one direction). Next, the phase current will have to be detected.

Here, varying a part of the pulse width modulation of the three phases in order to ensure the minimum effective vector actually means shifting the switching timing of the switching elements in the inverter.

As such, when the pulse width modulation is varied to detect the phase current, voltage distortion and current ripple may occur, thereby causing electrical noise (emotional noise). Therefore, in the present invention, in the undetected state of the minimum effective vector Tmin, the voltage distortion and the current reflow are limited in such a manner that the variation of the pulse width modulation is limited or the phase current is detected by minimizing the variable width even when the variation is necessary. The phase current can be switched to the second mode which can accurately detect the noise while reducing the emotional noise.

In addition, when the undetected state of the minimum effective vector Tmin is released or a predetermined time elapses after the execution of the second mode, the controller 380 switches to the above-described first mode to detect the phase current and correspond to the inverter. The driving of 350 is controlled.

Here, the first mode may have a higher frequency of use or a longer usage time than the second mode. For example, while operating in the first mode normally, the second mode may be operated only in a period in which the minimum effective vector Tmin is not obtained.

Further, when the control unit 380 of the clothes treating apparatus 100 according to an embodiment of the present invention detects a peak of a detection current while driving the inverter in the first mode or the second mode, the control unit 380 may previously It is possible to drive at least some of the plurality of inverters 351, 352, 353 using a third mode of limiting estimating other phase currents using the detected phase currents and detecting at least two phase currents of the three phases. .

Here, the peak generation of the detection current is detected by monitoring the degree of change in the detection current of the second time that is after the first time compared to the detection current of the first time that enters the control unit 380, that is, the microcomputer.

When the first detection current value detected at the first time point and the second detection current value detected at the second time point are significantly different than the reference value, the detection current value is regarded as 'splitting instantaneously' and a peak of the detection current occurs. Recognize that.

This is not an actual overcurrent, but if it is used to estimate the phase current of another phase or the next control period based on the peaked phase current, an error in current detection will occur, and even if no actual overcurrent has occurred, The driving of the caught motor (eg, the motor 363 of the compressor of the heat pump) can be stopped.

Accordingly, in the present invention, when the generation of the peak of the detection current is detected while controlling the driving of the inverter 350 in the first mode or the second mode, the phase current of another phase current or the next control period is replaced by the previously detected phase current. In order not to estimate, the current estimation method is limited, and the drive of the inverter is controlled in the third mode for detecting the current in two phases. Thus, in the phase current estimation after the peak generation of the detection current, the possibility of stopping the motor driving due to an error is eliminated. Accordingly, the control stability of the clothes treating apparatus 100 is further improved.

The controller 380 controls the switching timing of the switching elements in the inverter 350 to shift during the first mode or the second mode.

In detail, during the first mode, the controller 380 may estimate the current of another phase or the current of the three phases based on the detected current using the average phase current.

In addition, the controller 380 may estimate the other two phase currents based on the current of one phase sampled in one cycle of three phase pulse width modulation during the first mode.

Specifically, within the control period of the vector based pulse width modulation (PWM), when an effective voltage vector is applied, one phase current is detected from the shunt resistor disposed between the DC link capacitor and the inverter, and Phase current is analog-digital (A / D) converted, the effective vector and application time are determined, and the phase current is restored. In this way, two-phase current can be restored within one control period, and the current of the other one phase is estimated using the equilibrium condition of three-phase current, in which the sum of the three phase currents is zero.

In other words, in the region where phase current detection is possible, the current of one phase or three phases can be detected, and the current of the other phase can be estimated based on the detected current.

Meanwhile, when at least some of the three phases are in a state in which no minimum effective vector is detected, that is, when a section in which phase current cannot be detected is detected, the controller 380 may switch to the second mode to drive the inverter 350.

The reason for switching to the second mode in the minimum effective vector non-detection state, which is a section in which phase current detection is impossible in this manner, is as follows. Specifically, in the first mode, the pulse width modulation of one phase is varied or the pulse width modulation of two phases is controlled to ensure the minimum effective vector application time. In this case, the composite vector in one period is the same as the value due to the control result, but the composite vector during the half period is different from the value due to the control result. As a result, current ripple and noise of the clothes treating apparatus 100 are increased.

This is even greater when the minimum effective vector is not secured and one or two phase pulse width modulations must be shifted significantly. In the case of the laundry treatment apparatus 100, since many households use it indoors, it causes a problem of emotional noise.

Therefore, when the minimum valid vector is not secured, the operation is switched to the second mode. Specifically, when only the vector of one phase is not secured with the minimum effective vector, current detection of the one phase is possible, so that the pulse width modulation is not shifted. Also, if the vectors of two phases are not secured with the minimum effective vector, the pulse widths of all three phases are shifted to the minimum width so that current detection of one phase can be performed.

In this way, by suppressing the shift of the pulse width modulation or minimizing the width of the shift when the pulse width modulation is variable (actually, the current detection time is changed), the problem of the emotional noise of the clothes treating apparatus 100 is reduced. At the same time, the detection of the phase current can be made accurately.

5 and 6 illustrate examples in which the first mode, the second mode, and the third mode are selectively used according to the present invention when the inverter 350 is applied to the clothes treating apparatus 100 according to the present invention. It is a flowchart for doing so.

First, referring to FIG. 5, when the drying operation of the clothes treating apparatus according to the present invention is started (S501), the first motor 361 for driving the drum 301 according to the first mode or the second mode described above is described. Or controls the driving of the first inverter 351 or the third inverter 353 to supply power (or voltage) to the third motor 363 for driving the compressor of the heat pump 303 (S502). .

Specifically, when the drying operation of the clothes treating apparatus 100 starts, the control unit 380 usually detects the three-phase current or restores the two-phase current according to the first mode, and the other one according to the equilibrium conditions. By estimating, the drive of the inverter is controlled by detecting the three-phase current of the motor.

In addition, the controller 380 switches to the second mode so that the emotional noise may be reduced when the undetected state of the minimum effective vector is detected while driving the inverter 350 in the first mode to perform a drying operation. By detecting the shift of the pulse width modulation or varying the pulse width modulation for the three phases to the minimum width, the current of one phase is detected and the remaining phases are detected by estimating the three-phase current.

Next, when the occurrence of the peak of the detection current is detected, the use of the first mode or the second mode by the current estimation technique is restricted for a predetermined time, and the inverter 350 is driven in the third mode (S503). That is, the third mode of sensing the two-phase current through the current detector, for example, is performed without using a current estimation technique from the first mode and the second mode of estimating the at least some phase current.

Here, the peak generation of the detection current may be detected based on the degree of change of the detection current at the second time after the first time compared to the detection current at the first time entering the microcomputer.

Specifically, when the difference between the magnitude of the first detection current sensed at the first time point and the second detection current sensed at the second time point exceeds the reference value, it is considered that a peak of the detection current occurs. In this case, when estimating another phase current using the previously detected phase current, driving of the heat pump 303 compressor motor 363 may be stopped due to an abnormality of the detection current.

Therefore, at this time, by limiting a current estimation technique for estimating another phase current using the previous detection current and detecting the phase current according to the third mode, the switching time of the inverter 350 can be adjusted. For example, the controller 380 may control the switching of the inverter 350 at a fixed timing without changing the current detection section according to the operation of the third mode.

On the other hand, if it is determined that a predetermined time elapses and the detection current is not a peak value, the controller 380 may switch the third mode to the first mode or the second mode to drive the inverter.

At this time, the controller 380 may control to return to the operation mode used before the peak generation of the detection current is detected to drive the inverter 350. Alternatively, the controller 380 may control to drive the inverter 350 using the first mode by default unless the minimum valid vector is not detected.

As described above, according to the present invention, the current is generated in any one of the first mode, the second mode, and the third mode according to whether the detection of the minimum effective vector is detected or whether the peak of the detection current is generated, but not in the actual overcurrent state. By detecting the control by driving the inverter 350, the emotional noise can be reduced and the accuracy of detection of the current and the control stability can be improved.

Next, referring to FIG. 6, after the drying operation of the clothes treating apparatus 100 is started 611, it is determined whether at least one of the three phase vectors for driving the inverter does not satisfy the minimum valid vector (612). . In operation, the first mode 613 or the second mode 614 is operated.

If it is determined that all three phase vectors satisfy an application time of a minimum effective vector or more, the current is detected according to the first mode 613 to control the driving of the inverter 350.

If at least one of the three phase vectors is smaller than the application time of the minimum effective vector, only one phase is detected without shifting the pulse width modulation and the remaining current is estimated using a current estimation technique or the width or modulation of the shift of the pulse width modulation. By operating the inverter in a second mode in which only one phase current is sensed and the rest are estimated by minimizing the width of the circuit, the clothes processing apparatus 100 generated due to the shift of the pulse width modulation in the section where phase current sampling is impossible. Reduce the emotional noise.

In addition, when the undetected state of the minimum valid vector is released, that is, in a control cycle in which phase current sampling is possible, the inverter driving may be controlled by switching back to the first mode.

In the second mode 614, when only the application time of one voltage vector of the three phases is smaller than the minimum effective vector ('first state'), the pulse width modulation of the three phases is varied, i.e., shifted regardless of the magnitude of the voltage vector. Restrict all Thus, there is no problem of emotional noise due to voltage distortion and current ripple.

In the second mode 614, if the application time of two voltage vectors of the three phases is less than the minimum effective vector ('second state'), the pulse width modulation is shifted to detect at least one phase current. In order to minimize the variable width, the larger of the first voltage vector and the second voltage vector is selected, and the three-phase pulse width modulation is performed with a minimum variable width that can secure the minimum effective vector application time. Shift all.

Specifically, at the application time of the minimum effective vector, the value obtained by subtracting the application time of the selected voltage vector is determined as the shift width, and the three-phase pulse width modulation is shifted based on the selected voltage vector. This also minimizes the asymmetrical formation of the vector.

For example, in FIG. 6, as a result of comparing the magnitudes of the voltage vector at the first time point T1 and the voltage vector at the second time point T2 within one period of pulse width modulation, the voltage vector of T1. When the size of the T is larger than T2 and smaller than the minimum effective vector, the switching timing is minimum shifted based on the time T1 to determine the current detection time.

On the other hand, when the magnitude of the voltage vector of T2 is larger than T1 and smaller than the minimum effective vector, the phase current detection time is determined by shifting the switching timing to the minimum based on the time point T2.

As shown in Fig. 6, since all three-phase pulse width modulation is shifted to the minimum, the generation of voltage distortion and ripple current is also minimized.

As described above, even when the drive of the inverter is controlled in the first mode or the second mode, if a peak occurs in the detected phase current, the inverter is driven by switching to the third mode 615 to stabilize the control.

In this regard, referring to FIG. 7A, the actual current value 701 is not an overcurrent, when the detected current value 702 has a peak, and the current estimation technique used in the first mode or the second mode is peaked. In the case of a generation time (a), as shown in FIG. 7B, it can be seen that the driving of the compressor of the heat pump 180 is actually stopped.

Therefore, in order to more reliably eliminate the possibility of control error due to the application of the current estimation technique at the peak occurrence time (a), the inverter is switched to the third mode, that is, the inverter is driven by detecting the current without using the current estimation technique. It is.

To this end, the present invention discloses an example of detecting a current of at least two of three phases, but is not limited thereto. In addition, it is also possible to limit the phase current detection by the current estimation method by adding a separate detector for detecting the phase current or by changing a control period for detecting the phase current.

In addition, as shown in FIGS. 7C and 7D, when the driving stop phenomenon C of the heat pump 303 compressor occurs, the flag generation (i.e., reset) for an abnormality of the detection current is generated, not a stop due to an actual overcurrent. You can check it. This can be seen from the fact that the driving stop of the motor 363 driving the heat pump 303 compressor has occurred at an actual overcurrent detection level, for example, a current peak value higher than 13A.

As such, whether to switch to the third mode may be determined after the motor 363 of the compressor of the heat pump 180 is driven according to the start of the drying operation of the clothes treating apparatus 100.

That is, when the inverter is driven in the first mode or the second mode, a peak is detected in the detected current because a current estimation technique is used to estimate the phase current of another phase or the next control period using the previously detected phase current. After that, it was confirmed that other phase currents were detected with a large current value, so that the operation of the compressor motor of the heat pump 303 could be stopped even though no actual overcurrent occurred.

Therefore, if the compressor motor of the heat pump 303 is not driven, it is not necessary to switch to the third mode, so that control is made to determine whether to switch to the third mode at least after the compressor motor of the heat pump 303 is driven. can do.

FIG. 8 shows a current detection scheme in which the third mode is additionally mixed to detect phase current so that the driving of the motor 363 of the heat pump 303 compressor is not affected when the detection current peak occurs.

FIG. 8 (a) detects the current of one phase in a section in which a minimum effective vector is secured (or performs a minimum width shift for this) according to the first mode or the second mode described above, and detects the current of the remaining phases. It estimates and detects three-phase current.

FIG. 8B illustrates detection of at least two phase currents through a current detector (not shown) of the detector 340 without estimating current of another phase, that is, without current estimation, according to a peak of the detection current. .

In the first mode or the second mode, the current of the other phase is estimated based on the sampling current, or the shift of the pulse width modulation is minimized or the shift is limited, and the current of the other phase is estimated using only the current of one phase if it is detected. The drive of the inverter in a controlled manner.

However, as described above, when the peak of the detection current occurs, the control of the motor 363 driving the compressor of the heat pump 303 may be affected by noise, so that even if a voltage distortion or ripple current occurs temporarily, The driving of the corresponding inverter 353 is controlled by detecting a current of two phases without current estimation, or by detecting currents of at least two phases at a time point when an application time of the minimum effective vector is satisfied.

FIG. 8C shows that after operating in the third mode, a predetermined time has elapsed, the apparatus switches to the first mode or the second mode and detects phase current. Since the peak generation of the detection current is instantaneous, most of the detection current is detected to its original size again after a certain time.

Therefore, after operating in the third mode, after a predetermined time, the inverter is driven by switching to the first mode if the minimum effective vector is secured, and switching to the second mode if the minimum effective vector is not secured. Drive.

Even when driving in the first mode, if it is necessary to detect the current in a section in which the minimum effective vector is not secured, the inverter is driven again in the second mode. When the minimum valid vector is secured while driving in the second mode, the inverter 350 is driven again in the first mode. Herein, it is possible to implement the first mode most frequently.

9A, 9B, and 9C are diagrams for describing an application time of a minimum effective vector and a detection time of a current.

FIG. 9A illustrates that the stabilization time due to the ringing occurring during the switching of the switch in the inverter, the dead time and the delay time of the inverter should be included in the application time of the minimum valid vector. To explain that.

9B shows a current detection time point in an effective voltage vector having a minimum valid vector. FIG. 9C illustrates a current detection time point in a minimum effective vector, and illustrates an example of determining a sensing time point by varying a pulse width modulation.

Next, FIGS. 10A, 10B, 10C, 10D, 10E, 10F, 11A, 11B, 12A, and 12B illustrate the first mode and the second mode in the non-detected state of the minimum effective vector in the present invention. Figures related to selectively using modes.

First, with reference to FIGS. 10A, 10B, 10C, 10D, 10E, and 10F, a variable control of the pulse width modulation according to the first mode in the current estimation technique and the non-detection state of the minimum effective vector will be described. .

Figure 10a shows the principle of the current estimation technique, to estimate the current of the other phase with the detection current of one phase using the 120 degree phase relationship of the three phase current to estimate the vector based three phase current. In the waveform of FIG. 10A, the current of the front phase is estimated based on the current of the rear phase.

The controller 380 drives the inverter in the first mode while an effective vector is detected for all three phases in one period of the pulse width modulation signal, that is, in a section in which current can be detected. In the first mode, while the minimum effective vector is detected for all three phases, all three phase currents are detected, or two of the three phases are detected and the other one is obtained by estimating the equilibrium conditions of the three phase currents.

Next, referring to FIG. 10B, first, a phase current ia is detected for a T2 / 2 time since the first effective vector for the three-phase current is “100”. Next, since the second effective vector is "110", the c-phase current (-ic) is detected for T1 / 2 hours. The b phase current, which is the other one, may be obtained through calculation according to a current estimation technique. In this way, the driving of the inverter can be controlled by acquiring vector current and performing vector control.

10C-10F show vectors and pulse width modulated signals associated with acquiring phase current for vector control, in the undetected state of the least effective vector.

FIG. 10C shows a case where an effective vector of one of three phases is smaller than a minimum valid vector Tmin in one control period according to control of vector based pulse width modulation. The resistance V disposed between the DC link capacitor and the inverter generates a region V3 in which current detection is impossible, and corresponds to a region in which phase current detection is impossible.

In addition, FIG. 10D illustrates a case where two valid vectors of three phases are smaller than the minimum valid vector Tmin in one control period according to the control of the vector-based pulse width modulation. At this time, the region between V2 and V1 corresponds to the region where phase current detection is impossible.

Referring to FIG. 10E corresponding to FIG. 10C, it can be seen that the T2 / 2 is larger than the minimum valid vector, but the T1 / 2 does not satisfy the minimum valid vector. 10F corresponding to FIG. 10D, it may be confirmed that the minimum valid vector is not satisfied in both T1 / 2 and T2 / 2.

Therefore, only the phase a current can be detected in FIG. 10E. In addition, in Fig. 10F, neither a phase current nor c phase current can be detected.

10E (i.e., only a phase current is detected), according to the second mode described above, a phase current is detected, c phase current is estimated therefrom, and b phase current is a three phase equilibrium condition. Can be obtained according to. That is, the remaining phase current is estimated using only one phase current without variation in pulse width modulation. In other words, the turn-on timing of the inverter does not shift. Therefore, there is no fear of distortion or ripple of the voltage vector at this time.

In the case corresponding to FIG. 10F (that is, when neither a phase current nor c phase current can be detected), the phase current is detected by varying the phase of the pulse width modulation to the minimum width according to the second mode described above. That is, instead of shifting the turn-on timing in the form as shown in FIG. 10B in which the two-phase current is detectable, the turn-on timing is set in all three phases so as to be in the form as shown in FIG. 10C, that is, only as much as the current in one phase can be detected. Shift to a minimum to minimize distortion and ripple in the voltage vector.

Accordingly, in the present invention, the first mode or the second mode is performed according to whether the minimum valid vector is not detected, and furthermore, whether or not the current of one phase is undetectable (ie, the first state) when the minimum valid vector is not detected. Control is performed differently by distinguishing whether the current of the two phases is undetectable (that is, the second state).

Next, referring to FIGS. 11A and 11B, according to the second mode, it is shown that the pulse width modulation is variably controlled to the minimum variable width for phase current sampling.

In FIG. 11A, since the voltage vector at T1 is larger than T2, the pulse width modulation on a, b, and c phases may be shifted to the minimum width so as to satisfy the minimum effective vector in the T1 / 2 interval, thereby detecting a phase current. . The other one is estimated from a phase current, and the other is obtained according to the three phase equilibrium conditions. In addition, since FIG. 11B shows that the voltage vector at T2 is larger than T1, the pulse width modulation on a, b, and c phases is shifted to the minimum width so that the minimum effective vector is satisfied in the T2 / 2 interval, thereby detecting a phase current. Can be.

Further, in the second state of the second mode according to the present invention, as shown in Figs. 11A and 11B, since the pulse width modulation of all three phases is symmetrically shifted to the minimum width, voltage distortion due to an asymmetric shift is caused. And ripple generation is minimized. Therefore, even while controlling the switching operation of the inverter in the second mode in the section in which the minimum effective vector is not secured, there is almost no voltage distortion and ripple due to the asymmetry of the vector.

As another example, when the motor 363 of the compressor of the heat pump 303 is driven below a predetermined speed, the clothes treating apparatus according to the present invention may detect the motor driving speed through a speed detector (not shown). . In this case, the controller 380 may control the frequency or execution time of the first mode to be smaller than the second mode while at least one of the first motor and the second motor is driven at a speed lower than or equal to the reference value.

This results in a narrow turn-on timing interval of the inverter switching element due to the three-phase vector when driving the motor 363 at a low speed, for example, when the driving speed is less than 30 rpm, thereby further reducing the phase current detection interval. This is because there are more sections where the current cannot be detected.

In addition, the controller 380 may control the driving of the inverter 350 based on a current sampled through a resistor (eg, a shunt resistor) disposed between the DC link capacitor and the inverter. In the first mode, another phase current can be estimated based on the current sampled in this way.

As described above, according to the laundry treatment apparatus and its operation method according to an embodiment of the present invention, if it is detected that the application time of the voltage vector is less than the minimum effective vector application time of at least one of the three phases based on the effective vector Distortion of the voltage vector by selectively using the first mode in which the current is estimated using the previously detected phase current and the second mode in which the pulse width modulation of the three phases are variable or the variable width is limited to detect the current in one phase And while the noise due to the ripple is reduced can accurately detect the phase current flowing through the motor of the clothes treating apparatus. In addition, if a peak of the detection current is generated while the motor is driving, it is limited to estimating the current of the other phase using the previously detected phase current and is switched to the third mode which detects the current of at least two of the three phases. This eliminates the control problem in which the compressor motor of the heat pump can be stopped even if the actual current is not an overcurrent but the detected current is a peak value.

The present invention described above can be embodied as computer readable codes on a medium in which a program is recorded. The computer-readable medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable media include hard disk drives (HDDs), solid state disks (SSDs), silicon disk drives (SDDs), ROMs, RAM, CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and the like. This also includes those implemented in the form of carrier waves (eg, transmission over the Internet). In addition, the computer may include a clothes processing apparatus 100 and a control unit 380. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims (12)

A body forming an appearance;
A drum containing a drying object and rotatably installed in the main body;
A compressor of the heat pump compressing the refrigerant so that the moisture is removed from the heated air absorbed from the drying object, and the air from which the moisture is removed passes through the condenser and is thermally circulated to the drum;
A blowing fan for generating a flow of the heated air or the dehumidified air;
A plurality of motors for driving the drum, the blowing fan, and a compressor of the heat pump;
A plurality of inverters for supplying power to the plurality of motors; And
A control unit for controlling driving of the plurality of inverters, and controlling switching of switches provided in each of the plurality of inverters based on control of pulse width modulation based on a vector;
The control unit,
The first mode and the three-phase pulse width modulation is variable by detecting an undetected state of the minimum effective vector within the control period of the pulse width modulation and estimating at least one current of the three phases using a previously detected phase current. Selectively uses a second mode of limiting the width to detect current in one phase,
The plurality of inverters using a third mode which limits the use of previously detected phase currents and detects at least two phase currents of three phases when a peak of a detection current occurs during driving in the first mode or the second mode. Clothing processing apparatus characterized in that for driving at least a portion of the. The method of claim 1,
The peak generation of the detection current is detected by monitoring the degree of change in the detection current of the second time after the first time compared to the detection current of the first time entering the microcomputer of the clothes processing apparatus. The method of claim 1,
Whether or not to switch to the third mode is determined after the motor for driving the compressor of the heat pump in accordance with the start of the drying operation of the main body. The method of claim 1,
The minimum effective vector is the sum of the dead time time of the inverter, the stabilization time after ringing occurrence, the interior permanent magnet (IPM) margin time, and the analog-to-digital conversion time at the time of switching of the switch,
The undetected state of the minimum effective vector is a case where the application time of the voltage vector is smaller than the minimum effective vector within the control period of the pulse width modulation. The method of claim 1,
The control unit,
And the plurality of inverters are driven in the first mode while a minimum effective vector is detected for all three phases within the control period of the pulse width modulation. The method of claim 5,
In the first mode, while the minimum effective vector is detected for all three phases is detected by detecting two currents of the three phases and the other current is obtained by estimating the equilibrium condition of the three-phase current . The method of claim 1,
The control unit,
In the undetected state of the minimum valid vector, drives the inverter using the second mode and goes from the second mode to the first mode in response to the undetected state being released while driving in the second mode; Clothing processing apparatus characterized in that for driving the inverter by switching. The method of claim 1,
The control unit,
When the peak of the detection current occurs in the first mode or the second mode, the inverter switches to the third mode to drive the inverter,
And the inverter is driven in the first mode or the second mode according to whether or not the minimum effective vector is detected when a predetermined time elapses. The method of claim 1,
The second mode may be any one of a first state in which one of three phases is detectable in an undetected state of the minimum valid vector, and a second state in which at least two of the three phases are in an undetected state of a minimum valid vector. Differently,
While the control unit drives the inverter in the second mode:
In the first state, all the variations of the pulse width modulation of the three phases are limited,
And wherein in the second state, the pulse width modulation of the three phases is symmetrically varied with a minimum variable width corresponding to the minimum effective vector so that the current of one of the three phases is detected. The method of claim 1,
Further comprising a sensing unit for sensing at least one driving speed of the plurality of motors,
The control unit,
And at least one of the plurality of motors is driven at a speed lower than or equal to a reference value, so that the frequency or execution time of the first mode is controlled to be smaller than the frequency or execution time of the second mode. A body forming an appearance;
A drum containing a drying object and rotatably installed in the main body;
A compressor of the heat pump compressing the refrigerant so that the moisture is removed from the heated air absorbed from the drying object, and the air from which the moisture is removed passes through the condenser and is thermally circulated to the drying drum;
A blowing fan for generating a flow of the heated air or the dehumidified air;
A first motor for driving the drum and the blower fan and a second motor for driving a compressor of the heat pump;
First and second inverters respectively supplying power to the first motor and the second motor; And
A resistor element disposed between the DC link capacitor and the first inverter and the second inverter; And
Controlling the driving of the first inverter and the second inverter based on the current sampled through the resistor element, and respectively controlling the first inverter and the second inverter based on the control of the pulse width modulation based on the vector. It includes a control unit for controlling the switching of the provided switch,
The control unit,
Detects the undetected state of the minimum effective vector within the control period of the pulse width modulation, and limits the variable width of the pulse width modulation of the first mode and three phases to estimate the current of the other phase based on the sampled current. Selectively uses a second mode for detecting current,
When the peak of the detection current occurs during the driving in the first mode or the second mode, the first inverter using a third mode that limits the use of previously detected phase currents and detects at least two of the three phase currents. And at least some of the second inverters. The method of claim 11,
The control unit,
After the drive of the second motor for a predetermined time to drive the inverter using the first mode or the second mode,
And whether to switch to the third mode after the second motor is driven according to the start of the drying operation of the main body.

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