KR20160097697A - Compressor driving device and refrigerator including the same - Google Patents

Abstract

The present invention relates to a compressor driver and a refrigerator including the same. The compressor driver according to an embodiment of the present invention comprises: an inverter to convert DC power into AC power by a switching operation and to output the converted AC power to a motor for driving a compressor; an output current detection unit to detect an output current flowing in the motor; and a control unit to control the inverter based on the detected output current, wherein the control unit controls to drive the motor based on an operating current command value and a current command value in accordance with a frequency variation, to calculate a velocity or a vibration of the motor based on the output current detected in the output current detection unit while the motor is driven and to determine a resonant frequency based on the calculated velocity or vibration of the motor. Thereby, a resonant frequency of the compressor can be simply calculated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a compressor driving apparatus and a refrigerator including the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor driving apparatus and a refrigerator having the same, and more particularly, to a compressor driving apparatus and a refrigerator having the compressor driving apparatus.

Generally, a refrigerator is a device used to store foods fresh for a long period of time. The refrigerator is composed of a freezer compartment for freezing food, a refrigerator compartment for refrigerating the plant, and a freezing cycle for cooling the freezer compartment and the refrigerating compartment. The operation control is performed by the control unit.

Unlike in the past, such a refrigerator is not simply a space for eating, but it is transformed into a major living space for family members to converge and solve dietary habits. Therefore, refrigerator, which is a key element in kitchen space, In addition, there is a need for quantitative / qualitative functional changes to facilitate the use of all family members.

SUMMARY OF THE INVENTION An object of the present invention is to provide a compressor driving apparatus capable of easily grasping a resonance frequency for a compressor and a refrigerator having the compressor driving apparatus.

According to an aspect of the present invention, there is provided a compressor driving apparatus for converting a DC power source into an AC power source by a switching operation, An output current detection section for detecting an output current flowing through the motor; and a control section for controlling the inverter based on the detected output current, wherein the control section controls the drive current command value and the frequency Based on the current command value based on the variable, and calculates the speed or vibration of the motor based on the output current detected by the output current detection unit during the motor operation, and based on the calculated speed or vibration of the motor , And determines the resonance frequency.

According to another aspect of the present invention, there is provided a refrigerator including a compressor, a motor for operating the compressor, and a compressor driver for driving the motor, wherein the compressor driver drives the DC power source Converted to AC power, and converted AC power. An output current detection section for detecting an output current flowing through the motor; and a control section for controlling the inverter based on the detected output current, wherein the control section controls the drive current command value and the frequency Based on the current command value based on the variable, and calculates the speed or vibration of the motor based on the output current detected by the output current detection unit during the motor operation, and based on the calculated speed or vibration of the motor , And determines the resonance frequency.

A compressor driving apparatus and a refrigerator having the same according to the embodiment of the present invention drive a motor on the basis of a current command value and a current command value based on a frequency variable and determine whether the output current detected by the output current detection unit The resonance frequency of the compressor can be grasped simply by calculating the speed or vibration of the motor based on the calculated speed or vibration of the motor.

Particularly, by discriminating the resonance frequency using the frequency variation of the current, it is possible to actively detect the resonance frequency which can be changed by the compressor scattering, and the influence of the compressor scattering can be minimized.

On the other hand, after the determination of the resonance frequency, the compressor can be operated stably by avoiding the resonance frequency during normal operation. In addition, vibration and noise can be significantly reduced.

1 is a perspective view illustrating a refrigerator according to an embodiment of the present invention.
Fig. 2 is a perspective view of the door of the refrigerator of Fig. 1 opened. Fig.
3 is a view showing the ice maker of Fig.
FIG. 4 is a view schematically showing a configuration of the refrigerator of FIG. 1;
FIG. 5 is a block diagram schematically illustrating the interior of the refrigerator shown in FIG. 1. FIG.
6 is a circuit diagram showing the compressor driving unit of FIG.
7 is a circuit diagram showing an example of the inside of the inverter control unit of Fig.
8 to 9 are views referred to in the description of the operation of the inverter control unit of FIG.
10A and 10B are flowcharts showing various examples of the operation method of the compressor driving apparatus according to the embodiment of the present invention.
11 is a diagram illustrating various home appliances having a compressor driving apparatus according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.

The suffix "module" and " part "for components used in the following description are given merely for convenience of description, and do not give special significance or role in themselves. Accordingly, the terms "module" and "part" may be used interchangeably.

1 is a perspective view illustrating a refrigerator according to an embodiment of the present invention.

The refrigerator 1 according to the present invention includes a case 110 having an inner space divided into a freezing chamber and a refrigerating chamber, a freezing chamber door 120 for shielding the freezing chamber, The outer appearance of the refrigerator is formed by the door 140 of the refrigerator.

A door handle 121 protruding frontward is further provided on the front surface of the freezing compartment door 120 and the refrigerating compartment door 140 so that the user can easily grip the freezing compartment door 120 and the refrigerator compartment door 140 .

Meanwhile, a home bar 180 may be provided on the front of the refrigerator compartment door 140, which is a means for allowing a user to take out a stored beverage such as beverage without opening the refrigerator compartment door 140.

The dispenser 160 may be provided on the front surface of the freezer compartment door 120 as a convenience means for allowing a user to easily remove ice or drinking water without opening the freezer compartment door 120. In addition, A control panel 210 may be further provided on the upper side of the refrigerator 1 for controlling the driving operation of the refrigerator 1 and showing the state of the refrigerator 1 in operation.

Although the dispenser 160 is disposed on the front surface of the freezer compartment door 120, the present invention is not limited thereto. The dispenser 160 may be disposed on the front surface of the refrigerator compartment door 140.

In the upper portion of the freezing chamber (not shown), there are provided an ice-maker 190 for ice-making water supplied from the freezing chamber by using cool air in the freezing chamber, an ice bank (not shown) mounted inside the freezing chamber (Not shown). Further, although not shown in the drawings, an ice chute (not shown) may be further provided to guide the ice contained in the ice bank 195 to be dropped by the dispenser 160. The ice maker 190 will be described later with reference to FIG.

The control panel 210 may include an input unit 220 including a plurality of buttons, and a display unit 225 for displaying a control screen and an operation state.

The display unit 225 displays information such as a control screen, an operating state, and a room temperature. For example, the display unit 225 can display the service type (each ice, water, sculptured ice) of the dispenser, the set temperature of the freezer, and the set temperature of the freezer.

The display unit 225 may be implemented in various types such as a liquid crystal display (LCD), a light emitting diode (LED), and an organic light emitting diode (OLED). Also, the display unit 225 may be implemented as a touch screen capable of performing the function of the input unit 220 as well.

The input unit 220 may include a plurality of operation buttons. For example, the input unit 220 may include a dispenser setting button (not shown) for setting a dispenser service type (ice, water, sculpted ice, etc.), a freezer room temperature setting button (not shown) And a refrigerator compartment temperature setting button (not shown) for setting the freezer compartment temperature. Meanwhile, the input unit 220 may be implemented as a touch screen capable of performing the function of the display unit 225 as well.

Meanwhile, the refrigerator according to the embodiment of the present invention is not limited to the double door type shown in the drawing, but may be a one door type, a sliding door type, a curtain door type It is sufficient that the ice bank 195 and the ice bank vibrating unit 175 for vibrating the ice bank 195 are disposed inside the freezing chamber regardless of the shape of the ice bank 195 and the curtain door type.

Fig. 2 is a perspective view of the door of the refrigerator of Fig. 1 opened. Fig.

Referring to the drawings, a freezing chamber 155 is disposed inside the freezing chamber door 120, and a refrigerating chamber 157 is disposed inside the refrigeration chamber door 140.

An ice bank 190 is provided in the upper portion of the freezing chamber 155 for ice-making water using the cool air in the freezing chamber 155. The ice bank 190 is installed inside the freezing chamber (not shown) An ice bank vibrating unit 175 for vibrating the ice bank 195, and a dispenser 160 are disposed. Although not shown in the drawing, an ice chute (not shown) for guiding the ice contained in the ice bank 195 to drop into the dispenser 160 may be further disposed.

3 is a view showing the ice maker of Fig.

The ice maker 190 includes an ice-making tray 212 for containing water for making ice into a predetermined shape of ice, a water supplying section 213 for supplying water to the ice-making tray 212, A slider 214 provided so as to be able to slide the ice-ice to the ice bank 190, and a heater (not shown) for separating the ice-ice from the ice-making tray 212.

The ice-making tray 212 can be fastened to the freezing chamber 155 of the refrigerator by the fastening portion 212a.

The ice maker 190 includes a ice-making driving unit 216 that operates the ejector 217 and ice (ice) that is axially combined with a motor (not shown) provided in the ice- And an ejector 217 for ejecting the ink to the ice bank 195.

The ice-making tray 212 has a substantially semi-cylindrical shape, and the inner surface of the ice-making tray 212 is formed with the partitioning protrusions 212b at predetermined intervals so that ice can be separated and taken out.

The ejector 217 includes a shaft 217a formed to cross the center of the ice-making tray 212 and a plurality of ejector pins 217b formed on the side surface of the shaft 217a of the ejector 217 do.

Here, each ejector pin 217a is positioned between the partitioning protrusions 212b of the ice-making tray 212, respectively.

The ejector pins 217a are means for ejecting the produced ice to the ice bank 195. [ For example, the ice moved by the ejector pin 217a is put on the slider 214 and then slides along the slider 214 surface to fall into the ice bank 195. [

Although not shown in the drawing, a heater (not shown) is attached to the bottom surface of the ice-making tray 212 to raise the temperature of the ice-making tray 212 to melt ice adhering to the surface of the ice- And is separated from the ice-making tray 212. The separated ice is discharged to the ice bank 195 by the ejector 217.

The ice maker 190 senses whether or not ice is filled in the ice bank 195 located below the ice tray 190 before separating the ice from the ice tray 212 And a light receiving unit 233 and a light receiving unit 234, respectively.

The light transmission unit 233 and the light reception unit 234 are disposed under the ice maker 190 and can transmit and receive predetermined light in the ice bank 195 using an infrared sensor or a light emitting diode (LED).

For example, when an infrared sensor type is used, an infrared ray transmitter 233 and an infrared ray receiver 234 are provided below the ice maker 190, respectively. In the case of non-full ice, the infrared receiver 234 receives the high level signal, and when it is full ice, receives the low level signal. Thus, the controller 310 determines whether or not it is full. On the other hand, one or more infrared receiver 234 can be used, and two infrared receiver 234 are shown.

The light transmitting portion 233 and the light receiving portion 234 may be embodied in a structure embedded in the lower case 219 of the icemaker 190 to protect the elements from moisture,

The control unit 310 controls the operation of the ice-making driving unit 216 so that ice is no longer supplied to the ice bank 195 Do not remove it.

On the other hand, an ice bank vibration unit 175 for vibrating the ice bank 195 can be disposed at the lower end of the ice bank 195. Although the ice bank vibration unit 175 is disposed at the lower end of the ice bank 195 in the drawing, it is not limited thereto and may be any adjacent position such as the side wall as long as it can vibrate the ice bank 195.

FIG. 4 is a view schematically showing a configuration of the refrigerator of FIG. 1;

The refrigerator 1 includes a compressor 112, a condenser 116 for condensing the refrigerant compressed by the compressor 112, a condenser 116 for condensing the refrigerant condensed in the condenser 116, A freezer compartment evaporator 124 disposed in a freezer compartment (not shown), and a freezer compartment expansion valve 134 for expanding the refrigerant supplied to the freezer compartment evaporator 124. [

Meanwhile, the compressor 112 in the present invention may include a reciprocal compressor.

In the figure, one evaporator is used, but it is also possible to use the evaporator in each of the refrigerating chamber and the freezing chamber.

That is, the refrigerator 1 includes a refrigerating compartment evaporator (not shown) disposed in a refrigerating compartment (not shown), a three-way valve (not shown) for supplying the refrigerant condensed in the condenser 116 to a refrigerating compartment evaporator (Not shown), and a refrigerating compartment expansion valve (not shown) for expanding the refrigerant supplied to the refrigerating compartment evaporator (not shown).

The refrigerator 1 may further include a gas-liquid separator (not shown) in which the refrigerant having passed through the evaporator 124 is separated into a liquid and a gas.

The refrigerator 1 further includes a freezer compartment fan (not shown) and a freezer compartment fan 144 that suck cool air having passed through the freezer compartment evaporator 124 and blow it into a refrigerator compartment (not shown) and a freezer compartment can do.

The controller may further include a compressor driving unit 113 for driving the compressor 112 and a refrigerating compartment fan driving unit (not shown) and a freezing compartment fan driving unit 145 for driving the refrigerating compartment fan (not shown) and the freezing compartment fan 144 have.

In this case, a damper (not shown) may be installed between the refrigerator compartment and the freezer compartment, and a fan (not shown) may be installed between the refrigerator compartment and the freezer compartment, Can be forcedly blown to be supplied to the freezer compartment and the refrigerating compartment.

FIG. 5 is a block diagram schematically illustrating the interior of the refrigerator shown in FIG. 1. FIG.

5 includes a compressor 112, a machine room fan 115, a freezer compartment fan 144, a controller 310, a heater 331, an ice maker 190, an ice bank 195, A temperature sensing unit 321, and a memory 240. The refrigerator includes a compressor driving unit 113, a mechanical room fan driving unit 117, a freezing compartment fan driving unit 145, a heater driving unit 332, a ice making driving unit 216, an ice bank vibrating unit 175, a display unit 225, And an input unit 220.

For a description of compressor 112, machine room fan 115, and freezer compartment fan 144, see FIG.

The input unit 220 includes a plurality of operation buttons and transmits a signal to the control unit 310 about the input freezing room set temperature or the refrigerating room setting temperature.

The display unit 225 can display the operating state of the refrigerator.

The memory 240 may store data necessary for refrigerator operation.

The temperature sensing unit 321 senses the temperature in the refrigerator and transmits a signal regarding the sensed temperature to the controller 310. [ Here, the temperature sensing unit 321 senses the refrigerator compartment temperature and the freezer compartment temperature, respectively. It is also possible to detect the temperature of each chamber in the refrigerating chamber or each chamber in the freezing chamber.

The control unit 310 controls the compressor driving unit 113 and the fan driving unit 117 or 145 as shown in the figure for controlling the on / off operation of the compressor 112 and the fan 115 or 144 Thereby finally controlling the compressor 112 and the fan 115 or 144. Here, the fan driving unit may be the machine room fan driving unit 117 or the freezing room fan driving unit 145.

For example, the control unit 310 can output a corresponding speed command value signal to the compressor driving unit 113 or the fan driving unit 117 or 145, respectively.

The compressor driving unit 113 and the freezing compartment fan driving unit 145 each include a compressor motor (not shown) and a freezer compartment fan motor (not shown), and each motor (not shown) And can be operated at the target rotation speed according to the control.

On the other hand, the machine room fan driving unit 117 includes a motor for fan room fan (not shown), and a motor for fan room fan (not shown) can be operated at the target rotating speed under the control of the controller 310.

When such a motor is a three-phase motor, it can be controlled by a switching operation in an inverter (not shown) or can be controlled at a constant speed by using AC power as it is. Here, each motor (not shown) may be any one of an induction motor, a BLDC (blush less DC) motor, a synRM (synchronous reluctance motor) motor, and the like.

On the other hand, the control unit 310 can control the operation of the entire refrigerator 1, in addition to the operation control of the compressor 112 and the fans 115 and 144, as described above.

For example, the control unit 310 can control the operation of the ice bank vibration unit 175. [ Particularly, when ice cubes are sensed, ice cubes are controlled to be taken out from the ice maker 190 to the ice bank 195, and the ice bank 195 can be controlled to vibrate during the ice extraction or within a predetermined time after the ice cubes are taken out. As described above, by vibrating the ice bank 195 at the time of taking out the ice, the ice in the ice bank 195 can be uniformly distributed.

In addition, the controller 310 can vibrate the ice bank 195 repeatedly at predetermined time intervals to prevent the ice bank 195 from being frozen and kept from ice.

When the dispenser 160 is operated by the user's operation, the control unit 310 controls the ice in the ice bank 195 to be taken out by the dispenser 160. In addition, It can be controlled to vibrate the ice bank 195 just before. Specifically, it is possible to control the ice bank oscillation unit 175 to control the ice bank 195 to operate. As a result, it is possible to prevent the phenomenon of ice coming out to the user at the time of taking out ice.

The control unit 310 can control the heater (not shown) in the ice maker 190 to operate in order to freeze the ice in the ice-making tray 212. [

On the other hand, the control unit 310 may control the ice-making driving unit 216 to operate the ejector 217 in the ice-maker 190 after the heater (not shown) is turned on. This is a control operation for smoothly taking out the ice into the ice bank 195.

On the other hand, when the ice in the ice bank 195 is judged to be full ice, the control unit 310 can control to turn off the heater (not shown). Also, the operation of the ejector 217 in the ice maker 190 can be controlled to stop.

On the other hand, the control unit 310 can control the overall operation of the refrigerant cycle in accordance with the set temperature from the input unit 220, as described above. For example, the three-way valve 130, the refrigerating compartment expansion valve 132, and the freezing compartment expansion valve 134 may be controlled in addition to the compressor driving unit 113, the refrigerating compartment fan driving unit 143 and the freezing compartment fan driving unit 145 . The operation of the condenser 116 can also be controlled. In addition, the control unit 310 may control the operation of the display unit 225.

On the other hand, the heater 331 may be a freezer defrost heater. The freezer compartment defroster heater 331 may be operated to remove the property adhering to the freezer compartment evaporator 124. [ To this end, the heater driving unit 332 can control the operation of the heater 331. [ On the other hand, the control unit 310 can control the heater driving unit 332.

6 is a circuit diagram showing the compressor driving unit of FIG.

The compressor driving unit 113 according to the embodiment of the present invention includes a converter 410, an inverter 420, an inverter control unit 430, an input current detection unit A, a dc voltage detection unit B ), A smoothing capacitor (C), and an output current detector (E).

Meanwhile, since the compressor driving unit 113 drives the motor 230 in the compressor 112, it may be called a motor driving unit, a motor driving unit, or a compressor driving unit.

First, the input current detection section A can detect the input current (is) input from the commercial AC power source 405. To this end, a current transformer (CT), a shunt resistor, or the like may be used as the input current detector A. The detected input current is is a pulse-shaped discrete signal that can be input to the inverter control unit 430 for power consumption calculation.

The converter 410 converts the coarse commercial AC power source 405 into a DC power source and outputs it. Although the commercial AC power source 405 is shown as a single-phase AC power source in the figure, it may be a three-phase AC power source. The internal structure of the converter 410 also changes depending on the type of the commercial AC power source 405.

Meanwhile, the converter 410 may include a diode without a switching element, and may perform a rectifying operation without a separate switching operation.

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

On the other hand, the converter 410 may be, for example, a half-bridge type converter in which two switching elements and four diodes are connected, and in the case of a three-phase AC power source, six switching elements and six diodes may be used .

Next, a capacitor C for storing or smoothing the power converted by the converter 410 may be provided at the output terminal of the converter 410. Both ends of the capacitor C at this time can be named dc stages. Therefore, the capacitor C may be referred to as a dc-stage capacitor.

The dc voltage detection unit B can detect the dc voltage Vdc at both ends of the smoothing capacitor C. [ For this purpose, the dc voltage detection unit B may include a resistance element, an amplifier, and the like. The detected dc voltage source Vdc can be input to the inverter control unit 430 as a discrete signal in the form of a pulse.

The inverter 420 can drive the compressor 112. In particular, the compressor motor 230 in the compressor 112 can be driven.

To this end, the inverter 420 includes a plurality of inverter switching elements, and converts the smoothed direct current power Vdc into a three-phase alternating current power (va, vb, vc) of a predetermined frequency by on / off operation of the switching element And outputs it to the three-phase synchronous motor 230.

The inverter 420 includes a pair of upper arm switching elements Sa, Sb and Sc and lower arm switching elements S'a, S'b and S'c serially connected to each other, The switching elements are connected to each other in parallel (Sa & S a, Sb & S'b, Sc & S'c). Diodes are connected in anti-parallel to each switching element Sa, S'a, Sb, S'b, Sc, S'c.

The switching elements in the inverter 420 perform ON / OFF operations of the respective switching elements based on the inverter switching control signal Sic from the inverter controller 430. [ Thus, three-phase AC power having a predetermined frequency is output to the three-phase synchronous motor 230.

The inverter control unit 430 can control the switching operation of the inverter 420. [ To this end, the drive controller 430, and can receive the output current (i _o) detected by the output current detector (E).

The inverter control unit 430 outputs the inverter switching control signal Sic to the inverter 420 to control the switching operation of the inverter 420. [ Inverter switching control signal (Sic) is output is generated by a switching control signal of a pulse width modulation (PWM), based on the output current (i _o) detected by the output current detector (E). Detailed operation of the output of the inverter switching control signal Sic in the inverter control unit 430 will be described later with reference to Fig.

An output current detector (E) detects the inverter 420 and the three-phase motor output current (i _o) flowing between (230). That is, the current flowing in the motor 230 is detected. The output current detection unit E can detect all of the output currents ia, ib, ic of each phase or can detect the output currents of two phases using the three-phase balance.

The output current detection unit E may be located between the inverter 420 and the motor 230. For current detection, a current transformer (CT), a shunt resistor, or the like may be used.

Three shunt resistors are placed between the inverter 420 and the synchronous motor 230 or the three lower arm switching elements S'a, S'b, S'c To be connected to each other. On the other hand, it is also possible to use two shunt resistors using three phase equilibrium. On the other hand, when one shunt resistor is used, the shunt resistor may be disposed between the capacitor C and the inverter 420 described above.

The detected output current (i _o) are, as discrete signals (discrete signal) of the pulse type, may be applied to the inverter controller 430, the inverter switching control signal (Sic) based on the detected output current (i _o) Is generated. In the output current detection (i _o) will now be described in that the three-phase output currents (ia, ib, ic) of the.

On the other hand, the compressor motor 230 may be a three-phase motor. The compressor motor 230 is provided with a stator and a rotor and each alternating current power source of a predetermined frequency is applied to a coil of a stator of each phase (a, b, c phase) do.

Such a motor 230 may be, for example, a surface-mounted permanent magnet synchronous motor (SMPMSM), an interior permanent magnet synchronous motor (IPMSM) A synchronous motor (Synchronous Reluctance Motor; Synrm), and the like. Among these, SMPMSM and IPMSM are permanent magnet applied Permanent Magnet Synchronous Motor (PMSM), and Synrm is characterized by having no permanent magnet.

On the other hand, when the compressor 112 is driven, when the compressor 112 is driven with the resonance frequency, that is, when the compressor motor 230 is driven with the resonance frequency, considerable noise and vibration are generated.

In order to reduce such noise and vibration, it is necessary to discriminate the resonance frequency with respect to the compressor 112.

In the present invention, a method of simply grasping the resonant frequency using the inverter control unit 430 without any additional apparatus is presented.

The inverter control unit 430 controls the motor 230 to be driven based on the current command value and the current command value based on the frequency variable and controls the motor 230 during the operation of the motor 230. [ It is possible to calculate the speed or vibration of the motor 230 and to determine the resonance frequency based on the speed or the vibration of the motor 230 that has been calculated. As a result, the resonance frequency of the compressor 112 can be easily grasped.

Particularly, by discriminating the resonance frequency using the frequency variable of the current, the resonance frequency which can be changed by the dispersion of the compressor 112 can be actively sensed, and the influence of the dispersion of the compressor 112 can be minimized.

Specifically, the inverter control unit 430 controls the motor 230 to drive based on the operation current command value and the current command value based on the frequency variable in the resonant frequency detection mode, and controls the motor 230 And controls the motor 230 to store the speed or vibration of the motor 230. When the resonance frequency detection mode is completed, the maximum speed or the maximum speed of the stored motor or the maximum speed Based on the vibration, the resonance frequency can be determined.

On the other hand, after the resonance frequency detection mode, the inverter control unit 430 can control the resonance frequency avoiding operation based on the determined resonance frequency. As a result, the compressor 112 can be stably operated. In addition, vibration and noise can be significantly reduced.

7 is a circuit diagram showing an example of the inside of the inverter control unit of Fig.

7, the inverter control unit 430 includes an axis conversion unit 310, a speed calculation unit 320, a current command generation unit 330, a voltage command generation unit 340, an axis conversion unit 350, A switching control signal output unit 360, a frequency variable unit 345, a resonance frequency determination unit 537, a speed command generation unit 538, and a memory 539. [

The axial conversion unit 310 receives the three-phase output currents ia, ib, ic detected by the output current detection unit E and converts the three-phase output currents ia, ib, ic into the two-phase currents iα, iβ in the stationary coordinate system.

On the other hand, the axis converting unit 310 can convert the two-phase current i ?, i? Of the still coordinate system into the two-phase current id, iq of the rotating coordinate system.

)와 연산된 속도(

)를 출력할 수 있다.Based on the two-phase current (i?, I?) Of the stationary coordinate system changed in the axis by the axis converting unit 310, the speed calculating unit 320 calculates the speed

) And the calculated speed (

Can be output.

)와 속도 지령치(ω^* _r)에 기초하여, 전류 지령치(i^* _q)를 생성한다. 예를 들어, 전류 지령 생성부(330)는, 연산 속도(

)와 속도 지령치(ω^* _r)의 차이에 기초하여, PI 제어기(335)에서 PI 제어를 수행하며, 전류 지령치(i^* _q)를 생성할 수 있다. 도면에서는, 전류 지령치로, q축 전류 지령치(i^* _q)를 예시하나, 도면과 달리, d축 전류 지령치(i^* _d)를 함께 생성하는 것도 가능하다. 한편, d축 전류 지령치(i^* _d)의 값은 0으로 설정될 수도 있다. On the other hand, the current command generation unit 330 generates the current command

(I ^* _q ) on the basis of the speed command value? ^* _R and the speed command value? ^* _R. For example, the current command generation section 330 generates the current command

The PI controller 335 performs the PI control based on the difference between the speed command value? ^* _R and the speed command value? ^* _R , and generates the current command value i ^* _q . In the figure, the q-axis current command value (i ^* _q ) is exemplified by the current command value, but it is also possible to generate the d-axis current command value (i ^* _d ) unlike the figure. On the other hand, the value of the d-axis current command value i ^* _d may be set to zero.

On the other hand, the current command generation section 330 may further include a limiter (not shown) for limiting the current command value (i ^* _q ) so that the current command value (i ^* _q ) does not exceed the allowable range.

Next, the voltage command generating unit 340 generates the voltage command generating unit 340 with the d-axis and q-axis currents (i _d , i _q ) axially transformed into the two-phase rotational coordinate system in the axial converting unit and the current command value based on ^{_{i * d, i * q)}} , and generates a d-axis, q-axis voltage command value ^{_{(v * d, v * q}} ). For example, the voltage command generation unit 340 performs PI control in the PI controller 344 based on the difference between the q-axis current (i _q ) and the q-axis current command value (i ^* _q ) It is possible to generate the axial voltage command value v ^* _q . The voltage command generation unit 340 performs PI control in the PI controller 348 based on the difference between the d-axis current i _d and the d-axis current command value i ^* _d , It is possible to generate the command value v ^* _d . The voltage command generator 340 may further include a limiter (not shown) for limiting the level of the d-axis and q-axis voltage command values v ^* _d and v ^* _q so as not to exceed the permissible range .

On the other hand, the generated d-axis and q-axis voltage command values (v ^* _d and v ^* _q ) are input to the axial conversion unit 350.

)와, d축, q축 전압 지령치(v^* _d,v^* _q)를 입력받아, 축변환을 수행한다.The axis transforming unit 350 transforms the position calculated by the velocity calculating unit 320

) And the d-axis and q-axis voltage command values (v ^* _d , v ^* _q ).

)가 사용될 수 있다.First, the axis converting unit 350 performs conversion from a two-phase rotating coordinate system to a two-phase stationary coordinate system. At this time, the position calculated by the speed calculator 320 (

) Can be used.

Then, the axial conversion unit 350 performs conversion from the two-phase stationary coordinate system to the three-phase stationary coordinate system. Through this conversion, the axial conversion unit 1050 outputs the three-phase output voltage instruction values v ^* a, v ^* b, v ^* c.

The switching control signal output section 360 generates the switching control signal Sic for inverter according to the pulse width modulation (PWM) method based on the three-phase output voltage instruction values v ^* a, v ^* b and v ^* And outputs it.

The output inverter switching control signal Sic may be converted into a gate driving signal in a gate driving unit (not shown) and input to the gate of each switching element in the inverter 420. As a result, the switching elements Sa, S'a, Sb, S'b, Sc, and S'c in the inverter 420 perform the switching operation.

On the other hand, the frequency variable section 345 can generate the current command value I ^* f based on the frequency variable in the resonant frequency detection mode.

For example, while the motor 230 is constantly rotating at the first speed which is the target speed, the frequency variable section 345 generates the current command value I ^* f based on the frequency variable in the resonant frequency detection mode .

On the other hand, the frequency varying section 345 can sequentially vary the frequency with respect to the current while the motor 230 is constantly rotated at the first speed.

For example, the frequency variable unit 345 can sequentially generate a current command value corresponding to a high frequency from a current command value corresponding to a low frequency.

The frequency variable section 345 may be provided in the current command generation section 330.

On the other hand, in the normal operation mode other than the resonance frequency detection mode, the voltage command generation unit 340 generates the voltage command generation value (i ^* _d , i ^* _q ) and the output current io from the current command generation unit 330 to the voltage command values _{^{(v * d, v * q}} ) the generation, and the resonance frequency detection mode, the driving current instruction value _{^{(i * d, i * q}} ), (i * f) current command value based on the frequency variable based on and The voltage command values v ^* _d and v ^* _q can be generated based on the output current io.

The switching control signal output unit 360 outputs the axis-converted 3-phase output (v ^* _d , v ^* _q ) based on the voltage command value v ^* _d , v ^* _q based on the current command value I ^* f based on the frequency variable in the resonant frequency detection mode. And generates and outputs an inverter switching control signal Sic according to the pulse width modulation (PWM) method based on the voltage command values v ^* a, v ^* b and v ^* c.

On the other hand, the speed calculating section 320 calculates the speed or vibration of the motor 230 based on the output current detected by the output current detecting section E during the resonant frequency detecting mode.

The memory 539 can store the speed or vibration of the motor 230 calculated by the speed calculating unit 320 during the resonant frequency detecting mode. In particular, the memory 539 may store the speed or vibration of the motor 230, which is calculated for each variable current frequency.

The resonance frequency determination unit 537 can determine the resonance frequency based on the speed of the motor 230 stored in the memory 539 or the maximum speed or the maximum vibration among the vibrations when the resonance frequency detection mode is completed. Accordingly, the resonance frequency of the compressor 112 can be easily grasped.

On the other hand, after the resonance frequency detection mode, the speed command generation section 538 can generate the speed command value? ^* _R1 for resonance frequency avoiding operation based on the determined resonance frequency. In particular, the speed command value? ^* _R1 output from the speed command generation section 538 for resonance frequency avoidance operation can be input to the current command generation section 330. [

Then, in the normal operation mode after the resonance frequency detection mode, the current command generation unit 330 can generate and output the current command value (i ^* _d , i ^* _q ) so as to perform the resonance frequency avoiding operation.

Accordingly, the voltage command generation unit 340 can generate the voltage command values v ^* _d and v ^* _q so as to perform the resonance frequency avoiding operation.

The switching control signal output unit 360 outputs the switching control signal Sic for the inverter according to the pulse width modulation (PWM) method generated based on the voltage command values v ^* _d and v ^* _q so as to avoid the resonance frequency operation. Can be output.

Therefore, the motor 230 is driven by avoiding the resonance frequency. Accordingly, the compressor 112 can be stably operated. In addition, vibration and noise can be significantly reduced.

Fig. 8 is a diagram showing the motor drive by the resonance frequency detection mode, and Fig. 9 is a diagram illustrating the resonance frequency discrimination by the motor drive of Fig.

Referring to the drawing, during the first period T1, the rotational speed of the motor 230 increases to the first speed? 1, and during the second period T2, that is, during the resonant frequency detection mode, And the current command value by the frequency variable, the speed of the motor 230 is pulsated.

During the third period T3, the resonance frequency is discriminated while the rotational speed of the motor 230 rotates at the first speed? 1, and during the fourth period T4, according to the discriminated resonance frequency, The rotation speed of the motor 230 can be rotated at the second speed? 2 or the rotation speed of the motor 230 can be reduced at the third speed? 3.

The resonance frequency detection mode may correspond to the second period T2 and the third period T3.

During the second period T2, as described above, the inverter control unit 430 sequentially varies the frequency from a low frequency to a high frequency, and generates a current command value of the small signal corresponding to the variable frequency.

FIG. 9A illustrates frequency-varying current command value I ^* f sequentially from a low frequency to a high frequency.

The inverter control unit 430 drives the motor 230 during the second period T2 based on the current command value of the operation signal and the command signal of the small signal that correspond to the constant first speed?

When the motor 230 is operated by the current command value I ^* f whose frequency has changed from a low frequency to a high frequency sequentially, the inverter control unit 430 controls the motor 230 based on the detected output current io, (230).

During the third period T3 after the frequency change ends during the second period T2, the inverter control section 430 determines, based on the frequency stored in the memory 539, the calculated motor speed or vibration, The frequency corresponding to the maximum speed or the maximum vibration can be extracted, and the extracted frequency can be determined as the resonance frequency.

Fig. 9 (b) illustrates the speed or the vibration [omega] f of the motor calculated based on the frequency commanded current command value I ^* f sequentially from a low frequency to a high frequency.

Particularly, it can be seen that the change in the amplitude of the velocity is the largest in the Tx section. Accordingly, the inverter control unit 430 can determine the frequency component corresponding to the Tx section as the resonance frequency after the end of the second period (T2).

Thereafter, during the fourth period T4, the inverter control section 430 can increase or decrease the rotation speed of the motor so as to perform the determined resonance frequency avoiding operation.

10A and 10B are flowcharts showing various examples of the operation method of the compressor driving apparatus according to the embodiment of the present invention.

Referring to FIG. 10A, the current command generation unit 330 in the inverter control unit 430 generates a current command value based on the speed command value (S1005). Then, the motor 230 is driven based on the driving current command value.

For example, during the period T1 in Fig. 8, the operating current command value corresponding to the continuously rising speed command value can be generated.

Then, during the period T2, the operating current command value corresponding to the constant speed? 1 can be generated.

Next, the inverter control unit 430 determines whether the mode is the resonant frequency detection mode (S1010). If the mode is the resonant frequency detection mode, the inverter control unit 430 generates a current command value based on the frequency variable (S1015).

In particular, the frequency variable section 345 generates a current command value I ^* f based on a sequential frequency variable. The current command value based on the frequency variable to be generated is input to the voltage command generator 340.

Next, the inverter control unit 430 drives the motor 230 based on the current command value and the current command value based on the frequency variable (S1020).

The inverter control unit 430 drives the motor 230 according to a pulsating speed component in addition to the constant speed? 1 during the period T2 in FIG. In particular, the pulsating velocity component corresponds to a current command value based on a sequential frequency variable.

On the other hand, when the inverter control unit 430 is not in the resonance frequency detection mode, that is, in the normal operation mode, the inverter control unit 430 drives the motor 230 based on the operation current instruction value (S1025).

10B, the output current detection unit E detects the output current io flowing through the motor 230 (S1055).

Next, the inverter control section 430 calculates the speed or vibration of the motor based on the output current (S1060). In particular, the speed calculator 320 in the inverter controller 430 can calculate the speed or vibration of the corresponding motor for each variable frequency.

Next, the inverter control unit 430 determines whether or not the variable frequency interval has been completed (S1065), and if not, controls the memory 539 to store the calculated velocity or vibration of the frequency-dependent motor S1070).

On the other hand, in step 1065 (S1065), when the variable frequency section is completed, the inverter control section 430, particularly the resonance frequency determination section 537, determines the maximum pulse wave frequency as the resonance frequency based on the stored speed pulse or vibration (S1075).

Then, the inverter control unit 430 controls to perform the resonance frequency avoiding operation based on the determined resonance frequency (S1080).

In particular, the speed command generation section 538 can generate the speed command value speed command value? ^* _R1 for the resonance frequency avoidance operation based on the discriminated resonance frequency.

Meanwhile, the operation method of the compressor driving apparatus 113 described in Figs. 6 to 10B can be applied to various home appliances. In particular, the present invention can be applied to a home appliance having a compressor 112 as it is.

11 is a diagram illustrating various home appliances having a compressor driving apparatus according to an embodiment of the present invention.

11 (a) illustrates a dryer 200b for drying laundry, and FIG. 11 (b) illustrates an air conditioner 200c for supplying cold air to a room by driving a compressor And Fig. 11C illustrates a water purifier 200e that provides ice or the like by driving a compressor.

The compressor driving device and the refrigerator having the compressor driving device according to the present invention can be applied to all or some of the embodiments so that various modifications can be made. Some of which may be selectively combined.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present invention.

Claims (14)

The switching power supply unit converts the direct current power into the alternating current power by the switching operation, An inverter for outputting to a motor for driving a compressor;
An output current detector for detecting an output current flowing to the motor; And
And controlling the inverter based on the detected output current,
Wherein,
And controls the motor to be driven based on the current command value and the current command value based on the frequency variable,
Wherein the control unit calculates a speed or a vibration of the motor based on an output current detected by the output current detection unit during the motor drive,
And determines the resonance frequency based on the speed or the vibration of the calculated motor. The method according to claim 1,
Wherein,
In the resonant frequency detection mode,
And controls the motor to be driven based on the current command value and the current command value based on the frequency variable,
Wherein the control unit calculates a speed or a vibration of the motor based on an output current detected by the output current detection unit during the motor drive,
Controls to store the speed or vibration of the motor,
And when the resonance frequency detection mode is completed, judges the resonance frequency based on the speed or the maximum speed or the maximum vibration of the stored motor. The method according to claim 1,
Wherein,
Wherein the resonance frequency avoiding operation is performed based on the determined resonance frequency after the resonance frequency detecting mode. The method according to claim 1,
Wherein,
In the resonant frequency detection mode,
And controls the motor to be driven based on the current command value and the current command value based on the frequency variable,
And controls the motor to be driven based on the operation current command value when the mode is not the resonance frequency detection mode. The method according to claim 2 or 4,
Wherein,
In the resonant frequency detection mode,
And sequentially controls the frequency so as to drive the motor based on the operation current instruction value and the sequential frequency varying current instruction value. The method according to claim 1,
A frequency variable portion for generating a current command value based on the frequency variable in the resonant frequency detection mode;
A current command generator for generating the operating current command value based on the speed command value;
A speed calculating unit for calculating speed or vibration of the motor based on an output current detected by the output current detecting unit;
A memory for storing the calculated speed or vibration of the motor;
And a resonance frequency determination unit for determining a resonance frequency based on a maximum speed or a maximum vibration among the speed or vibration of the stored motor when the resonance frequency detection mode is completed. The method according to claim 6,
And a speed command generator for generating a speed command value for the resonance frequency avoiding operation based on the discriminated resonance frequency after the resonance frequency detection mode,
Wherein the speed command value for the resonance frequency avoiding operation is input to the current command generation unit. The method according to claim 6,
A voltage command generation unit for generating a voltage command value based on the operation current command value; And
And a switching control signal output unit for outputting a switching control signal for driving the inverter based on the voltage command value,
Wherein the voltage command generation unit comprises:
And in the resonant frequency detection mode, generates the voltage instruction value based on the operation current instruction value and the current instruction value based on the frequency variable. The method according to claim 1,
Wherein,
Controls to drive the motor based on a current command value and a current command value based on the frequency variable while the motor rotates at a constant speed,
Wherein the control unit calculates a speed or a vibration of the motor based on an output current detected by the output current detection unit during the motor drive,
And determines the resonance frequency based on the speed or the vibration of the calculated motor. compressor;
A motor for operating the compressor;
And a compressor driving unit for driving the motor,
Wherein the compressor-
The switching power supply unit converts the direct current power into the alternating current power by the switching operation, An inverter for outputting to a motor for driving a compressor;
An output current detector for detecting an output current flowing to the motor; And
And controlling the inverter based on the detected output current,
Wherein,
And controls the motor to be driven based on the current command value and the current command value based on the frequency variable,
Wherein the control unit calculates a speed or a vibration of the motor based on an output current detected by the output current detection unit during the motor drive,
And determines the resonance frequency based on the calculated speed or vibration of the motor. 11. The method of claim 10,
Wherein,
In the resonant frequency detection mode,
And controls the motor to be driven based on the current command value and the current command value based on the frequency variable,
Wherein the control unit calculates a speed or a vibration of the motor based on an output current detected by the output current detection unit during the motor drive,
Controls to store the speed or vibration of the motor,
And determines the resonance frequency based on the maximum speed or the maximum vibration among the velocity or vibration of the stored motor when the resonance frequency detection mode is completed. 11. The method of claim 10,
Wherein,
And after the resonance frequency detection mode, performs resonance frequency avoiding operation based on the determined resonance frequency. 11. The method of claim 10,
A frequency variable portion for generating a current command value based on the frequency variable in the resonant frequency detection mode;
A current command generator for generating the operating current command value based on the speed command value;
A speed calculating unit for calculating speed or vibration of the motor based on an output current detected by the output current detecting unit;
A memory for storing the calculated speed or vibration of the motor;
And a resonance frequency determining unit for determining a resonance frequency based on a maximum speed or a maximum vibration among the speed or vibration of the stored motor when the resonance frequency detecting mode is completed. 11. The method of claim 10,
Wherein,
Controls to drive the motor based on a current command value and a current command value based on the frequency variable while the motor rotates at a constant speed,
Wherein the control unit calculates a speed or a vibration of the motor based on an output current detected by the output current detection unit during the motor drive,
And determines the resonance frequency based on the calculated speed or vibration of the motor.

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