KR20180093341A - Motor driving apparatus and home appliance including the same - Google Patents

Abstract

The present invention relates to a motor driving apparatus and a home appliance including the same. According to one embodiment of the present invention, the motor driving apparatus comprises: a converter converting input AC power into DC power; a switching unit disposed on the front end of the converter, and including a resistor element and a relay element which are connected in parallel; an inverter disposed on an output end of the converter, including a plurality of switching elements, converting first DC power supplied from the converter into AC power, and outputting the converted AC power to a motor by switching operation; a rectifier connected to the converter or the switching unit in parallel and rectifying the input AC power; a power dropping unit disposed on the output end of the rectification unit to drop the voltage of second DC power supplied from the rectification unit, and outputting operational power to the inverter; and a control unit determining as a black out when a level of the input AC power is equal to or less than a first level, and in the case of the black out, turning off the relay element and stopping output of the invertor when the level of the first DC power is equal to or less than a second level and the level of the second DC power is equal to or greater than a third level. Accordingly, a circuit element is prevented from being burned by peak current after the black out.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a motor driving apparatus and a home appliance having the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor driving apparatus and a home appliance having the motor driving apparatus, and more particularly, to a motor driving apparatus and a home appliance having the motor driving apparatus that can prevent a circuit element from being burned out due to a peak current after a power failure.

The motor driving apparatus is an apparatus for driving a motor having a rotor for rotating and a stator for winding a coil.

The motor driving apparatus is an apparatus that drives an electric motor by using an AC power source after converting input AC power to DC power.

On the other hand, when the input AC power input to the motor driving apparatus is temporarily out of order, thereafter, the peak current flows to the circuit elements in the motor driving apparatus, resulting in a problem that the circuit elements such as the converter are burned out.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a motor driving apparatus capable of preventing a circuit element from being burned out due to peak current after a power failure and a home appliance having the motor driving apparatus.

According to an aspect of the present invention, there is provided a motor drive apparatus including a converter for converting an input AC power source to a DC power source, a switching element having a resistance element and a relay element, An inverter which is disposed at an output terminal of the converter and has a plurality of switching elements and converts the first DC power from the converter into AC power by the switching operation and outputs the converted AC power to the motor, And a power supply step-down unit that is connected in parallel to the switching unit and rectifies the input AC power, a power down unit that is disposed at the output end of the rectifying unit and reduces the second DC power from the rectifying unit and outputs operation power to the inverter, The level of the first DC power supply is equal to or lower than the second level at the time of power failure, and when the level of the first DC power supply is equal to or lower than the first level, If the level is, less than a third level, and controlled so that the relay device is off, and a control unit for controlling so that the output of the inverter is stopped.

According to another aspect of the present invention, there is provided a motor driving apparatus including: a converter for converting input AC power to DC power; a resistor element and a relay element disposed in front of the converter, An inverter for converting the first DC power from the converter into an AC power and outputting the converted AC power to the motor by a switching operation, the inverter comprising: a switching unit provided at an output terminal of the converter, A power down unit that is connected in parallel to the converter or the switching unit and rectifies the input AC power, a power down unit that is disposed at the output end of the rectifying unit and reduces the second DC power from the rectifying unit and outputs operation power to the inverter, When the level of the first DC power supply is equal to or lower than the first level and the level of the second DC power supply is equal to or higher than the second level, Said a controller for controlling so that the output of the inverter is stopped.

According to another aspect of the present invention, there is provided a home appliance comprising a converter for converting an input AC power to a DC power, a resistor element disposed at a front end of the converter and connected in parallel to each other, A switching unit having a relay element and a plurality of switching elements disposed in an output terminal of the converter and configured to convert the first direct current power from the converter into an alternating current power by the switching operation, A rectifying part connected in parallel to the converter or the switching part for rectifying the input AC power; a power step-down control part which is disposed at the output end of the rectifying part to step down the second DC power from the rectifying part, When the level of the input AC power source is equal to or lower than the first level, it is determined that the power failure has occurred. In the case of a power failure, Or less and, in the case where the level of the second DC power source, at least a third level, and controls so that the relay device off, and a control unit for controlling so that the output of the inverter is stopped.

According to another aspect of the present invention, there is provided a home appliance including a converter for converting input AC power into DC power, a resistor element and a relay element disposed in front of the converter and connected in parallel to each other An inverter for converting the first DC power from the converter into an AC power and outputting the converted AC power to the motor by a switching operation; A power down unit that is connected in parallel to the converter or the switching unit and rectifies the input AC power, a power down unit that is disposed at the output end of the rectifying unit and reduces the second DC power from the rectifying unit and outputs operation power to the inverter, When the level of one DC power supply is equal to or lower than the first level and the level of the second DC power supply is equal to or higher than the second level, And a control unit for controlling so that the output of the inverter is stopped.

A motor driving apparatus and a home appliance having the motor driving apparatus according to an embodiment of the present invention include a converter for converting input AC power into DC power, a resistor element and a relay element disposed in front of the converter and connected in parallel to each other An inverter for converting the first DC power from the converter into an AC power and outputting the converted AC power to the motor by a switching operation; A power down unit that is connected in parallel to the converter or the switching unit and rectifies the input AC power, a power down unit that is disposed at the output end of the rectifying unit and reduces the second DC power from the rectifying unit and outputs operation power to the inverter, When the level of the AC power source is equal to or lower than the first level, it is determined that the power failure occurs. In the case of power failure, the level of the first DC power source is equal to or lower than the second level, When the level of the DC power supply is equal to or higher than the third level, the relay element is controlled to be turned off and the output of the inverter is stopped. Thus, it is possible to prevent the circuit element from being damaged by the peak current after the power failure. Particularly, it is possible to prevent a circuit element such as a converter and an inverter from being burned.

Particularly, in the case of a power failure, the operation of the inverter can be stopped by continuously supplying the operation power to the control unit by the operation of the power down unit, so that it is possible to prevent the circuit element from being damaged by the peak current after the power failure.

According to another aspect of the present invention, there is provided a motor driving apparatus and a home appliance including the motor driving apparatus. The motor driving apparatus includes a converter for converting input AC power into DC power, a resistor element disposed in front of the converter, And a plurality of switching elements arranged in the output stage of the converter for converting the first DC power from the converter into AC power by the switching operation and outputting the converted AC power to the motor A power down unit that is connected in parallel to the inverter, the converter or the switching unit and rectifies the input AC power, a power down unit that is disposed at the output end of the rectifying unit and reduces the second DC power from the rectifying unit, , When the level of the first DC power supply is equal to or lower than the first level and the level of the second DC power supply is equal to or higher than the second level, And the control unit controls the output of the inverter to be stopped. Thus, it is possible to prevent the circuit element from being burned due to the peak current after the power failure. Particularly, it is possible to prevent a circuit element such as a converter and an inverter from being burned.

1 illustrates an example of an internal block diagram of a motor driving apparatus according to an embodiment of the present invention.
2 is an example of an internal circuit diagram of the motor driving apparatus of FIG.
3 is an internal block diagram of the inverter control unit of FIG.
4 is a timing chart showing changes of the first DC power supply and the second DC power supply when the input AC power supply is out of order.
5 is a flowchart illustrating an operation method of a motor driving apparatus according to an embodiment of the present invention.
6A to 7 are views referred to in the description of the operation method of FIG.
8 is a flowchart illustrating an operation method of a motor driving apparatus according to another embodiment of the present invention.
9A to 10 are views referred to in the description of the operation method of FIG.
11 is a perspective view illustrating a laundry processing apparatus according to an embodiment of the present invention.
12 is an internal block diagram of the laundry processing apparatus of FIG.
13 is a diagram illustrating a configuration of an air conditioner that is another example of a home appliance according to an embodiment of the present invention.
14 is a schematic view of the outdoor unit and the indoor unit of Fig.
15 is a perspective view illustrating a refrigerator as another example of a home appliance according to an embodiment of the present invention.
FIG. 16 is a view schematically showing the configuration of the refrigerator of FIG. 15;

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.

Meanwhile, the motor driving apparatus 220 according to the embodiment of the present invention may be referred to as a motor driving unit.

FIG. 1 illustrates an example of an internal block diagram of a motor driving apparatus according to an embodiment of the present invention, and FIG. 2 illustrates an example of an internal circuit diagram of the motor driving apparatus of FIG.

The motor driving apparatus 220 according to the embodiment of the present invention drives the motor in a sensorless manner and may include an inverter 420 and an inverter control unit 430 have.

The motor driving apparatus 220 according to the embodiment of the present invention includes a converter 410, a first dc voltage detecting unit B, a first dc short capacitor C, and an output current detecting unit E . The driving unit 220 may further include an input current detection unit A, a reactor L, and the like.

The inverter control unit 430 in the motor driving apparatus 220 according to an embodiment of the present invention determines that the level of the input AC power supply Vs is the first level Ith1 or lower, The relay element SL is controlled to be off when the level of the first DC power supply Vdc is equal to or lower than the second level Vth2 and the level of the second DC power supply Vdcs is equal to or higher than the third level Vth3, The output of the inverter 420 can be controlled to be stopped. It is possible to prevent the circuit element from being burned out due to the peak current after the power failure. In particular, it is possible to prevent the circuit elements such as the converter 410 and the inverter 420 from being burned.

Particularly, in the case of a power failure, since the operation of the inverter 420 that is generated can be stopped by continuously supplying the operating power to the inverter control unit 430 by the operation of the power down unit (417 in FIG. 2) It is possible to prevent the circuit element from being burned out by the current.

Hereinafter, the operation of each of the constituent units in the motor driving apparatus 220 of Fig. 1 and Fig. 2 will be described.

1 and 2 includes a switching unit 407, a converter 410, an inverter 420, an inverter control unit 430, a rectification unit 415, and a power source voltage step-down unit 417 can do.

The switching unit 407 may include a resistance element RL and a relay element SL disposed at the front end of the converter 410 and connected in parallel with each other.

On the other hand, the switching unit 407 supplies the input power to the converter 410 through the resistance element RL in the case of a power failure, and supplies the input power to the converter 410 via the relay element SL, Converter 410 as shown in FIG.

A reactor (L) is arranged between the commercial power supply, the input AC power source (405, v _s) and the converter 410, and performs power factor correction or a step-up operation. The reactor L may also function to limit the harmonic current due to the fast switching of the converter 410.

The input current detection section A can detect the input current (i _s ) input from the input AC power supply 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 i _s can be input to the inverter control unit 430 as a discrete signal in the form of a pulse.

The converter 410 converts the input AC power source 405, which has passed through the reactor L, into DC power and outputs the DC power. Although the input 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 input 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 . In this case, the converter 410 may be referred to as a rectifier.

When the converter 410 includes a switching element, the boosting operation, the power factor correction, and the DC power conversion can be performed by the switching operation of the switching element.

The first dc-capacitor C smoothes the input power supply and stores it. In the figure, one element is exemplified by the first dc-stage capacitor C, but a plurality of elements are provided so that the element stability can be ensured.

On the other hand, both ends of the first dc short capacitor C may be referred to as a dc stage or a dc stage since the dc power source is stored.

The first dc voltage detection unit B may detect the dc voltage Vdc at both ends of the first dc short capacitor C. [ To this end, the first 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 includes a plurality of inverter switching elements and converts the smoothed DC power supply Vdc into a three-phase AC power supply va, vb, vc having a predetermined frequency by on / off operation of the switching element, And outputs it to the 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 based on the sensorless method. To this end, the inverter control unit 430 may receive the output current idc detected by the output current detection unit 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. [ The inverter switching control signal Sic is generated and outputted based on the output current idc detected by the output current detection section E as a switching control signal of the pulse width modulation method (PWM). 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.

The output current detection unit E can detect the output current idc flowing between the three-phase motors 230. [

The output current detection unit E can be disposed in the inverter 420 and the motor 230 to detect the current flowing in the motor 230 as shown in the figure.

The output current detection section E may include three resistance elements as shown in the drawing. It is possible to detect phase currents (ia, ib, ic) that are the output currents io flowing through the motor 230 through the three resistive elements. The detected output currents (ia, ib, ic) can be applied to the inverter control unit 430 as a discrete signal in the form of pulses, and based on the detected output currents ia, ib, ic, The switching control signal Sic is generated.

In the present specification, the output currents ia, ib, ic, or io are used in combination.

On the other hand, unlike the drawing, the output current detecting section E may include two resistance elements. The phase currents of the remaining phases can be calculated using three-phase equilibrium.

The output current detector E is disposed between the first dc capacitor C and the inverter 420 and includes one shunt resistive element Rs so that the current flowing through the motor 230 Current may be detected. This method can be called a 1-shunt method.

According to the one-shunt method, the output current detection section E uses the single shunt resistor element Rs to detect the output current (current) flowing through the motor 230 in time division at the time of turning on the lower arm switching element of the inverter 420 idc) can be detected.

The detected output current idc can be applied to the inverter control unit 430 as a pulse discrete signal and the inverter switching control signal Sic is generated based on the detected output current idc .

On the other hand, the three-phase motor 230 has a stator and a rotor, and each phase alternating current power of a predetermined frequency is applied to a coil of a stator of each phase (a, b, c) .

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

The rectifying part 415 is connected in parallel to the converter 410 or the switching part 407 to rectify the input AC power Vs.

The power source voltage step-down unit 417 is disposed at the output terminal of the rectifying unit 415 to step down the second DC power source Vdcs from the rectifying unit 415 and output the operating power Voo to the inverter 420 .

For example, the second direct-current power supply Vdcs may be approximately 70V, and the operation power supply Voo may be 5V, 15V, or the like.

On the other hand, the first DC power supply Vc may be approximately 200V to 300V.

On the other hand, the power down unit 417 may be provided with a switch mode power supply (SMPS).

On the other hand, the power source voltage-down unit 417 can continuously output the operating power to the inverter 420 at the time of a power failure.

The second dc-stage capacitor Cs smoothes the input power supply and stores it. In the figure, one element is exemplified by the second dc-stage capacitor Cs, but a plurality of elements are provided so that the element stability can be ensured.

On the other hand, both ends of the second dc-stage capacitor Cs may be referred to as a dc stage or a dc-stage since the dc power source is stored.

The second dc voltage detecting unit B1 may be disposed between the output terminal of the rectifying unit 415 and concretely between the rectifying unit 415 and the power source voltage step-down unit 417.

The second dc voltage detection unit B1 can detect the second dc voltage Vdcs at both ends of the second dc short capacitor Cs. To this end, the second dc voltage detection unit B1 may include a resistance element, an amplifier, and the like. The detected second dc voltage Vdcs may be input to the inverter control unit 430 as a discrete signal in the form of a pulse.

On the other hand, the first dc-terminal capacitor C may be a small-capacity dc-terminal capacitor C, which is called a capacitorless. For example, a film capacitor.

On the other hand, the second dc-terminal capacitor Cs may be an electrolytic capacitor rather than a small-capacity capacitor.

In particular, the capacitance of the first dc-capacitor C may be smaller than the capacitance of the second dc-capacitor Cs.

As a result, the level change rate of the first DC power supply Vdc becomes larger than the level change rate of the second DC power supply Vdcs during a power failure.

The inverter control unit 430 determines that the level of the input AC power supply Vs is equal to or lower than the first level Ith1 and determines that the level of the first DC power supply Vdc is equal to or lower than the second level Vth2 When the level of the second DC power supply Vdcs is equal to or higher than the third level Vth3, the relay device SL is controlled to be turned off and the output of the inverter 420 is stopped. It is possible to prevent the circuit element from being burned out due to the peak current after the power failure. In particular, it is possible to prevent the circuit elements such as the converter 410 and the inverter 420 from being burned.

In particular, since the operation of the inverter 420 can be stopped by continuously supplying the operating power Voo to the inverter control unit 430 by the operation of the power down unit 417 during the power outage, It is possible to prevent the circuit element from being burned out by the current.

3 is an internal block diagram of the inverter control unit of FIG.

3, 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, And a switching control signal output unit 360.

The axis converting unit 310 can convert the output currents ia, ib, ic detected by the output current detecting unit E 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.

)를 추정하고, 추정된 위치를 미분하여, 속도(

)를 연산할 수 있다. Based on the output currents (ia, ib, ic) detected by the output current detecting unit E, the speed calculating unit 320 calculates the position value

), Differentiates the estimated position,

) Can be calculated.

)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.

4 is a timing chart showing changes of the first DC power supply and the second DC power supply when the input AC power supply is out of order.

4A illustrates an input current waveform Isa by an input AC power supply Vs and FIG. 4B illustrates a relationship between a voltage across both ends of the first dc- And FIG. 4C illustrates the second DC power supply waveform Vdcsa, which is the voltage across the second dc-capacitor Cs.

The input current waveform Isa, the first DC power supply waveform Vdca, and the second DC power supply waveform Vdcsa can be maintained at a predetermined level, respectively, in the case where no power failure occurs, that is, before the Tm.

On the other hand, since the level of the first DC power supply waveform Vdca is increased by the converter 410 or the like, it may be higher than the level of the second DC power supply waveform Vdcsa.

On the other hand, when a power failure occurs, the input current waveform Isa, the first DC power supply waveform Vdca, and the second DC power supply waveform Vdcsa are lowered.

The input current waveform Isa shows that the input current waveform is lowered at a constant level while a constant level is maintained. In particular, at the time Tm, the current level falls below the first level Ith1, Down to the level shown in FIG.

On the other hand, when the capacitance of the first dc-terminal capacitor C is smaller than the capacitance of the second dc-terminal capacitor Cs, the level change rate of the first DC power supply Vdc is lower than the level change rate of the second DC power supply Vdcs .

Accordingly, at the time of power failure, the first DC power supply waveform Vdca falls to the second level (Vth2) or lower at the time Tth, and finally falls to the zero level at the time Tm1.

On the other hand, at the time of power failure, the second DC power supply waveform (Vdcsa) falls more slowly than the first DC power supply waveform (Vdca), and finally falls to zero level at a Tm22 point farther than Tm1.

On the other hand, at the time Tth, the level of the second DC power supply waveform Vdcsa is maintained at the third level (Vth2) or higher.

On the other hand, when the power interruption is temporary, the input AC power supply Vs is supplied again after the Tth point and at the Tn point.

However, if the waveform of the second DC power supply waveform Vdcsa is equal to or greater than the third level Vth2 before the time Tn, the power supply voltage down unit 417 supplies the operating power supply Voo to the inverter 420, The inverter control unit 430 operates as it is despite the power failure.

Therefore, at the time Tn when the power failure is canceled, the current path by the input AC power supply Vs is applied to the relay element SL in the switching unit 407, the converter 410, the first dc- , And an inverter (420).

At this time, due to a sudden rise in level of the input AC power supply Vs at the time Tn when the power failure is canceled, the relay element SL, the converter 410, the first dc capacitor C , A peak current due to an inrush current may flow on the current path formed by the inverter 420. [

In the figure, it is exemplified that a peak current occurs in the input current waveform Isa at time Tn. In this case, the possibility of burning at least one circuit element of the relay element SL, the converter 410, the first dc short-circuit capacitor C, and the inverter 420 in the switching unit 407 located on the current path is increased do.

Then, in the event of actual burnout, the current path is no longer generated, and after the time Tn, the input current waveform Isa falls to the zero level as shown in Fig. 4 (a).

The present invention thus proposes a method for preventing the destruction of the circuit element due to the peak current after the power failure. This will be described with reference to FIG.

FIG. 5 is a flowchart illustrating an operation method of a motor driving apparatus according to an embodiment of the present invention, and FIGS. 6A to 7 are views referred to in the description of the operation method of FIG.

The motor driving apparatus according to an embodiment of the present invention includes a converter 410 for converting an input AC power supply Vs into a DC power supply, A switching element 407 having a resistance element RL and a relay element SL which is connected to the output terminal of the converter 410 and has a plurality of switching elements, An inverter 420 for converting the first DC power supply Vdc of the first DC power supply Vdc into an AC power and for outputting the converted AC power to the motor 230 and an inverter 420 connected in parallel to the converter 410 or the switching unit 407, A rectifying section 415 for rectifying the power source Vs and a second direct current power source Vdcs provided at the output terminal of the rectifying section 415 to step down the second direct current power source Vdcs from the rectifying section 415, When the level of the input AC power supply Vs is equal to or lower than the first level Ith1, When the level of the first DC power supply Vdc is equal to or lower than the second level Vth2 and the level of the second DC power supply Vdcs is equal to or higher than the third level Vth3 upon power failure, And the inverter control unit 430 controls the output of the inverter 420 to be stopped. As a result, it is possible to prevent the circuit element from being burned out due to the peak current after the power failure. In particular, it is possible to prevent the circuit elements such as the converter 410 and the inverter 420 from being burned.

In particular, since the operation of the inverter 420 can be stopped by continuously supplying the operating power Voo to the inverter control unit 430 by the operation of the power down unit 417 during the power outage, It is possible to prevent the circuit element from being burned out by the current.

Referring to the drawing, an input current or an input voltage in the motor driving apparatus 220 is detected (S510), and the detected input current or input voltage is input to the inverter control unit 430. [

2, when the input current detection unit A is provided in the motor driving device 220, the input current detected by the input current detection unit A may be input to the inverter control unit 430 .

Next, the inverter control unit 430 can determine whether the detected input current or input voltage is equal to or less than the first level (S515). If so, it can be determined that there is a power failure (S520).

Next, the inverter control unit 430 determines whether the level of the first DC power supply Vdc is equal to or lower than the second level Vth2 at the time of a power failure (S525). If so, It is determined whether or not the level of the inverter element Vdcs is equal to or greater than the third level Vth3 at step S530 and if so, the relay element SL is controlled to be turned off at step S535, (S540).

For example, as shown in FIG. 4, when the input current waveform Isa falls at the time of power failure and the current level falls to the first level (Ith1) or lower at the time Tm, the inverter control unit 430 , It can be judged as a power failure from the time Tm.

On the other hand, the inverter control unit 430 can determine whether or not the level of the first DC power supply Vdc is equal to or lower than the second level Vth2 from the point of time Tm.

As shown in Fig. 4, the first DC power supply waveform Vdca falls to the second level (Vth2) or lower at the time Tth. Accordingly, the inverter control unit 430 determines that the level of the first DC power supply Vdc is equal to or lower than the second level Vth2 from the time Tth, and the level of the second DC power supply Vdcs , And the third level (Vth3) or more.

As shown in Fig. 4, the level of the second DC power supply waveform Vdcsa can be maintained at the third level (Vth2) or higher, from the Tth point to the Tn point, which is the electrostatic attraction cancellation point.

4, the inverter control unit 430 controls the relay device SL to be turned off from the time Tth to the time Tn, which is the time to cancel the electrostatic discharge, Can be controlled to be stopped.

4, the relay element SL is turned on and the current flows through the first current path Ipath1 until the Tth point of time, By the time Tn, the relay element SL is turned off as shown in FIG. 6B, and current can flow through the second current path Ipath2.

Accordingly, even if the input AC power supply is again applied, the current flows through the resistance element RL in the switching unit 417, so that the resistance element RL supplies some power The peak current is not generated. Therefore, it is possible to reduce the possibility of burning of the circuit elements such as the converter 410 and the like.

On the other hand, FIG. 7 is a diagram illustrating an example in which a power failure is judged according to a level of an input voltage among input AC powers.

7A shows an input voltage waveform Vs1 by an input AC power supply Vs and FIG. 7B shows an rms voltage waveform of an input AC power supply Vs (FIG. 7A) Vrms), and FIG. 7 (c) illustrates the first DC power supply waveform Vdc1, which is the voltage across the first dc-side capacitor C.

In the case where a power failure occurs at the time T1, the rms voltage waveform (Vrms) shows that when the voltage level falls from the time T1 and falls to the Vtha voltage level corresponding to the second level, The relay element SL can be controlled to be turned off.

That is, the inverter control unit 430 can control the relay element SL to be off at the time point of Toffa, which is a time point at which the voltage drops to the Vtha voltage level of the rms voltage waveform Vrms.

Of course, as described above, on the assumption that the level of the second DC power supply Vdcs is equal to or higher than the third level Vth3 at the Toffa time, the inverter control unit 430 controls the relay element SL to be off . Further, the inverter control section 430 can control so that the output of the inverter 420 is stopped.

According to this method, since the inverter control unit 430 can control the relay element SL to be turned off at the time point of Toffa earlier than the time when the level of the input voltage actually drops to the zero level in the actual T2m, The circuit elements in the driving unit 220 can be safely protected.

On the other hand, the power source voltage step-down unit 417 can continuously output the operation power source Voo by the inverter 420 at the time of a power failure.

Nevertheless, the inverter control unit 430 controls the relay device SL to be turned off and controls the output of the inverter 420 to be stopped so that the circuit elements in the motor driving unit 220 can be safely protected.

FIG. 8 is a flowchart illustrating an operation method of a motor driving apparatus according to another embodiment of the present invention, and FIGS. 9A to 10 are diagrams referred to in the description of the operation method of FIG.

The driving apparatus for a motor 230 and the home appliance having the driving apparatus according to another embodiment of the present invention include a converter 410 for converting an input AC power source Vs into a DC power source, A switching section 407 having a resistance element RL and a relay element SL connected in parallel to each other and a switching element 407 disposed at an output terminal of the converter 410 and having a plurality of switching elements, An inverter 420 for converting the first DC power supply Vdc from the inverter 410 to an AC power and for outputting the converted AC power to the motor 230 and an inverter 420 for connecting the converter 410 or the switching unit 407 in parallel A rectifying section 415 for rectifying the input AC power supply Vs and a rectifying section 416 disposed at an output terminal of the rectifying section 415 to step down the second DC power supply Vdcs from the rectifying section 415, A power supply step-down unit 417 for outputting the power supply voltage Voo; And an inverter control unit 430 for controlling the relay device SL to be off and controlling the output of the inverter 420 to stop when the level of the second DC power supply Vdcs is equal to or higher than the second level Vth2, . ≪ / RTI > As a result, it is possible to prevent the circuit element from being burned out due to the peak current after the power failure. In particular, it is possible to prevent the circuit elements such as the converter 410 and the inverter 420 from being burned.

8 is similar to the operation method of FIG. 5 except that steps 510 to 520 (S510 to S525) relating to power failure determination are omitted, and instead, step 810 There is a difference in the detection of the dc voltage at step S810.

The first dc voltage detecting unit B may detect the first dc voltage source Vdc stored in the first dc capacitor C and the second dc voltage detecting unit B1 may detect the first dc voltage source Bc, The second DC power supply Vdcs stored in the second capacitor Cs may be detected (S810).

For example, as shown in FIG. 4, when the first DC power supply waveform Vdca falls to the second level (Vth2) or lower at the time Tth, the inverter control unit 430 sets the It is judged that the level of the one DC power supply Vdc is equal to or lower than the second level Vth2 and it is judged whether or not the level of the second DC power supply Vdcs which is the next stage is equal to or higher than the third level Vth3 .

As shown in Fig. 4, the level of the second DC power supply waveform Vdcsa can be maintained at the third level (Vth2) or higher, from the Tth point to the Tn point, which is the electrostatic attraction cancellation point.

4, the inverter control unit 430 controls the relay device SL to be turned off from the time Tth to the time Tn, which is the time to cancel the electrostatic discharge, Can be controlled to be stopped.

4, the relay element SL is turned on and the current flows through the first current path Ipath1 until the time point Tth, and then the relay element SL is turned on as shown in FIG. By the time Tn, the relay element SL is turned off as shown in Fig. 9B, and a current can flow through the second current path Ipath2.

Accordingly, even if the input AC power supply is again applied, the current flows through the resistance element RL in the switching unit 417, so that the resistance element RL supplies some power The peak current is not generated. Therefore, it is possible to reduce the possibility of burning of the circuit elements such as the converter 410 and the like.

10 (a) illustrates the rms waveform Ism of the input current by the input AC power supply Vs, and FIG. 10 (b) illustrates the rms waveform Ism of the input current by the voltage across the first dc- And FIG. 10C illustrates a second DC power supply waveform Vdcsm, which is a voltage across the second dc-capacitor Cs.

When the first DC power supply waveform (Vdcm) is observed at the Tx time point, the inverter control unit 430 determines that the voltage level falls from the Tx point to the Vthb voltage level corresponding to the second level, , It is possible to control the relay element SL to be turned off.

That is, the inverter control unit 430 can control the relay element SL to be turned off at the time of Ty, which is the time point at which the voltage falls to the Vthb voltage level of the first DC power source waveform Vdcm.

Of course, as described above, assuming that the level of the second DC power supply Vdcs is equal to or higher than the third level Vth3 at the time of Ty, the inverter control unit 430 controls the relay element SL to be off . Further, the inverter control section 430 can control so that the output of the inverter 420 is stopped.

According to this method, the inverter control unit 430 controls the relay element SL so that the relay element SL is turned off at the time Ty before the level of the rms waveform Ism of the input current drops to the zero level in the actual Tz The circuit elements in the motor driving unit 220 can be safely protected.

On the other hand, the power source voltage step-down unit 417 can continuously output the operation power source Voo by the inverter 420 at the time of a power failure.

Nevertheless, the inverter control unit 430 controls the relay device SL to be turned off and controls the output of the inverter 420 to be stopped so that the circuit elements in the motor driving unit 220 can be safely protected.

On the other hand, the motor driving apparatus 220 described above can be applied to various electronic apparatuses. For example, it can be applied to a laundry appliance, an air conditioner, a refrigerator, a water purifier, a cleaner, a vehicle, a robot, a drone, and the like in a home appliance. Various examples of home appliances applicable to the motor driving apparatus 220 will be described below.

11 is a perspective view illustrating a laundry processing apparatus according to an embodiment of the present invention.

Referring to the drawings, a laundry processing apparatus 100a according to an embodiment of the present invention is a front load type laundry processing apparatus in which a bag is inserted into a washing tub in a front direction. Such a front type laundry processing apparatus is a concept including a washing machine in which a bag is inserted and performing washing, rinsing and dewatering, or a dryer in which a wet cloth is inserted to perform drying, and the following description will mainly focus on a washing machine.

The laundry processing apparatus 100a of FIG. 11 is a laundry laundry processing apparatus which includes a cabinet 110 for forming an outer appearance of the laundry processing apparatus 100a, a cabinet 110 disposed inside the cabinet 110, A motor 130 for driving the washing tub 122 and a cabinet 110 disposed outside the cabinet main body 111. The washing tub 122 is disposed inside the cabinet 110, (Not shown) for supplying washing water to the inside of the tub 120 and a drain (not shown) for discharging washing water to the outside.

A plurality of through holes 122A are formed in the washing tub 122 so as to allow washing water to pass therethrough. The washing tub 122 is lifted up to a predetermined height during the rotation of the washing tub 122, (124) may be disposed.

The cabinet 110 includes a cabinet body 111 and a cabinet cover 112 disposed on the front surface of the cabinet body 111 and coupled to the cabinet body 111. The cabinet 110 is disposed above the cabinet cover 112, And a top plate 116 disposed on the control panel 115 and coupled to the cabinet main body 111. The cabinet main body 111 includes a top plate 116,

The cabinet cover 112 includes a catch and release hole 114 formed so as to be able to move in and out of the can and a door 113 arranged to be rotatable in the left and right direction so that the catch and release hole 114 can be opened and closed.

The control panel 115 is provided with operation keys 117 for operating the laundry processing apparatus 100a and a display device (not shown) disposed at one side of the operation keys 117 and for displaying the operation state of the laundry processing apparatus 100a 118).

The operation keys 117 and the display device 118 in the control panel 115 are electrically connected to a control unit (not shown), and a control unit (not shown) electrically controls each component, etc. of the laundry processing apparatus 100a do. The operation of the control unit (not shown) will be described later.

On the other hand, the washing tub 122 may be provided with autobalance (not shown). The autobalance (not shown) is for reducing vibrations caused by the amount of eccentricity of the laundry contained in the washing tub 122, and can be realized by liquid balance, ball balance, or the like.

The laundry processing apparatus 100a may further include a vibration sensor for measuring the vibration amount of the washing tub 122 or the vibration amount of the cabinet 110 although not shown in the drawing.

12 is an internal block diagram of the laundry processing apparatus of FIG.

Referring to the drawings, in the laundry processing apparatus 100a, the driving unit 220 is controlled by the control unit 210, and the driving unit 220 drives the motor 230. As a result, the washing tub 122 is rotated by the motor 230.

The control unit 210 receives an operation signal from the operation key 1017 and performs an operation. Thus, washing, rinsing and dewatering can be performed.

Also, the control unit 210 can control the display 18 to display the washing course, the washing time, the dehydration time, the rinsing time, or the current operation state.

Meanwhile, the control unit 210 controls the driving unit 220 so that the driving unit 220 controls the motor 230 to operate. At this time, a position sensing unit for sensing the rotor position of the motor is not provided inside or outside the motor 230. That is, the driving unit 220 controls the motor 230 by a sensorless method.

2) for detecting an output current flowing through the motor 230 and an inverter (not shown) for driving the motor 230. The drive unit 220 includes an inverter (not shown) And an output voltage detector (F in Fig. 2) for detecting an output voltage vo applied to the motor 230. [ Further, the driving unit 220 may be a concept further including a converter or the like that supplies DC power input to an inverter (not shown).

For example, the inverter control unit (430 in Fig. 2) in the driving unit 220 estimates the rotor position of the motor 230 based on the output current idc and the output voltage vo. Then, based on the estimated rotor position, the motor 230 is controlled to rotate.

Specifically, the inverter control unit 430 of FIG. 2 generates a switching control signal (Sic of FIG. 2) of a pulse width modulation (PWM) method based on the output current idc and the output voltage vo, (Not shown), the inverter (not shown) performs a high-speed switching operation, and supplies AC power of a predetermined frequency to the motor 230. Then, the motor 230 is rotated by an alternating current power source of a predetermined frequency.

On the other hand, the driving unit 220 may correspond to the motor driving device 220 of FIG.

On the other hand, the control unit 210 can detect the discharge amount based on the output current idc flowing to the motor 230 or the like. For example, while the washing tub 122 rotates, the laundry amount can be sensed based on the current value idc of the motor 230.

In particular, the control unit 210 can accurately detect the amount of the battery pack using the stator resistance and the inductance value of the motor measured in the motor alignment interval when the battery pack is detected.

Meanwhile, the control unit 210 may sense the amount of eccentricity of the washing tub 122, that is, the unbalance (UB) of the washing tub 122. This eccentricity detection can be performed based on the ripple component of the output current idc flowing to the motor 230 or the rotational speed change amount of the washing tub 122.

In particular, the controller 210 can accurately detect the amount of eccentricity by using the stator resistance and the inductance value of the motor measured in the motor alignment interval at the time of detecting the amount of discharged fluid.

13 is a diagram illustrating a configuration of an air conditioner that is another example of a home appliance according to an embodiment of the present invention.

The air conditioner 100b according to the present invention may include an indoor unit 31b and an outdoor unit 21b connected to the indoor unit 31b as shown in FIG.

The indoor unit 31b of the air conditioner may be any of a stand-type air conditioner, a wall-mounted type air conditioner, and a ceiling type air conditioner, but the stand type indoor unit 31b is exemplified in the figure.

Meanwhile, the air conditioner 100b may further include at least one of a ventilator, an air purifier, a humidifier, and a heater, and may operate in conjunction with the operation of the indoor unit and the outdoor unit.

The outdoor unit 21b includes a compressor (not shown) for receiving and compressing refrigerant, an outdoor heat exchanger (not shown) for exchanging heat between the refrigerant and outdoor air, an accumulator for extracting the gas refrigerant from the supplied refrigerant and supplying it to the compressor And a four-way valve (not shown) for selecting the flow path of the refrigerant according to the heating operation. In addition, a number of sensors, valves, oil recovery devices, and the like are further included, but a description thereof will be omitted below.

The outdoor unit 21b operates the compressor and the outdoor heat exchanger to compress or heat-exchange the refrigerant according to the setting to supply the refrigerant to the indoor unit 31b. The outdoor unit 21b can be driven by a demand of a remote controller (not shown) or the indoor unit 31b. At this time, as the cooling / heating capacity is changed corresponding to the indoor unit to be driven, the number of operation of the outdoor unit and the number of operation of the compressor installed in the outdoor unit can be varied.

At this time, the outdoor unit 21b supplies compressed refrigerant to the connected indoor unit 310b.

The indoor unit 31b receives the refrigerant from the outdoor unit 21b and discharges the cold air to the room. The indoor unit 31b includes an indoor heat exchanger (not shown), an indoor fan (not shown), an expansion valve (not shown) to which refrigerant is supplied, and a plurality of sensors (not shown).

At this time, the outdoor unit 21b and the indoor unit 31b are connected to each other via a communication line to exchange data. The outdoor unit and the indoor unit are connected to a remote controller (not shown) by wire or wireless, can do.

The remote controller (not shown) is connected to the indoor unit 31b, and inputs a control command of the user to the indoor unit, and receives and displays the status information of the indoor unit. At this time, the remote controller can communicate by wire or wireless according to the connection form with the indoor unit.

14 is a schematic view of the outdoor unit and the indoor unit of Fig.

Referring to the drawings, the air conditioner 100b is roughly divided into an indoor unit 31b and an outdoor unit 21b.

The outdoor unit 21b includes a compressor 102b that compresses the refrigerant, an electric motor 102bb that drives the compressor, an outdoor heat exchanger 104b that dissipates the compressed refrigerant, An outdoor fan 105b which is disposed at one side of the heat exchanger 104b and includes an outdoor fan 105ab for accelerating the heat radiation of the refrigerant and an electric motor 105bb for rotating the outdoor fan 105ab and an outdoor fan 105b for expanding the condensed refrigerant An accumulator 103b for temporarily storing the gasified refrigerant to remove water and foreign matter and supplying a refrigerant of a predetermined pressure to the compressor, a compressor 106b for compressing the refrigerant, a cooling / heating switching valve 110b for changing the flow path of the compressed refrigerant, And the like.

The indoor unit 31b includes an indoor heat exchanger 109b disposed inside the room and performing a cooling / heating function, an indoor fan 109ab disposed at one side of the indoor heat exchanger 109b for promoting heat radiation of the refrigerant, And an indoor fan 109b composed of an electric motor 109bb for rotating the fan 109ab.

At least one indoor heat exchanger 109b may be installed. At least one of an inverter compressor and a constant speed compressor can be used as the compressor 102b.

Further, the air conditioner 100b may be constituted by a cooler for cooling the room, or a heat pump for cooling or heating the room.

The compressor 102b in the outdoor unit 21b in Fig. 13 can be driven by a motor driving device, such as the one shown in Fig. 1, which drives the compressor motor 250b.

Alternatively, the indoor fan 109ab or the outdoor fan 105ab may be driven by a motor driving apparatus, such as the one shown in Fig. 1, which drives the indoor fan motor 109bb and the outdoor fan motor 150bb, respectively.

15 is a perspective view illustrating a refrigerator as another example of a home appliance according to an embodiment of the present invention.

The refrigerator 100c according to the present invention includes a case 110c having an inner space defined by a freezing compartment and a refrigerating compartment (not shown), a freezing compartment door 120c for shielding the freezing compartment, A refrigerating compartment door 140c is formed on the outer surface of the refrigerating compartment.

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

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

The dispenser 160c may be provided on the front surface of the freezing chamber door 120c as a convenience means for allowing the user to easily remove ice or drinking water without opening the freezing chamber door 120c. A control panel 210c for controlling the driving operation of the refrigerator 100c and showing the state of the refrigerator 100c in operation can be further provided on the upper side.

In the drawing, the dispenser 160c is disposed on the front surface of the freezing chamber door 120c. However, the dispenser 160c may be disposed on the front surface of the refrigerator chamber door 140c.

On the other hand, an ice-maker 190c for ice-cooling the water supplied from the ice maker using the cool air in the freezing room is provided in the upper portion of the freezing chamber (not shown), and an ice bank (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 195c to be dropped by the dispenser 160c.

The control panel 210c may include an input unit 220c including a plurality of buttons, and a display unit 230c for displaying a control screen and an operation state.

The display unit 230c displays information such as a control screen, an operating state, and a room temperature. For example, the display unit 230c can display the service type (ice, water, sculptured ice) of the dispenser, the set temperature of the freezer, and the set temperature of the freezer.

The display unit 230c may be implemented as a liquid crystal display (LCD), a light emitting diode (LED), an organic light emitting diode (OLED), or the like. Also, the display unit 230c may be implemented as a touch screen capable of performing the function of the input unit 220c.

The input unit 220c may include a plurality of operation buttons. For example, the input unit 220c includes a dispenser setting button (not shown) for setting the service type (each ice, water, sculpted ice, etc.) of the dispenser, a freezer room temperature setting button (not shown) And a refrigerator compartment temperature setting button (not shown) for setting the freezer compartment temperature. The input unit 220c may be implemented as a touch screen capable of performing a function of the display unit 230c.

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 (Curtain Door Type).

FIG. 16 is a view schematically showing the configuration of the refrigerator of FIG. 15;

The refrigerator 100c includes a compressor 112c, a condenser 116c for condensing the refrigerant compressed by the compressor 112c, and a condenser 116c for condensing the refrigerant condensed in the condenser 116c, A freezer compartment evaporator 124c disposed in a freezer compartment (not shown), and a freezer compartment expansion valve 134c for expanding the refrigerant supplied to the freezer compartment evaporator 124c.

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 100c 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 116c 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 100c may further include a gas-liquid separator (not shown) in which the refrigerant having passed through the evaporator 124c is separated into a liquid and a gas.

The refrigerator 100c further includes a refrigerator compartment fan (not shown) and a freezer compartment fan 144c that suck the refrigerant that has passed through the freezer compartment evaporator 124c and blow it into a refrigerator compartment (not shown) and a freezer compartment can do.

The refrigerator can further include a compressor driving unit 113c for driving the compressor 112c and a refrigerating compartment fan driving unit (not shown) and a freezing compartment fan driving unit 145c for driving the refrigerating compartment fan (not shown) and the freezing compartment fan 144c 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.

The compressor 112c of Fig. 16 can be driven by a motor drive device, such as the one shown in Fig. 1, which drives the compressor motor.

Alternatively, a refrigerator compartment fan (not shown) or a freezer compartment fan 144c may be driven by a motor drive device, such as the one shown in Figure 1, that drives a refrigerator compartment fan motor (not shown) and a freezer compartment fan motor .

The motor driving apparatus and the home appliance having the motor driving apparatus according to the embodiments of the present invention can be applied to the configuration and method of the embodiments described above in a limited manner, All or some of the embodiments may be selectively combined.

Meanwhile, the motor driving method or the method of operating the home appliance of the present invention can be implemented as a processor-readable code on a recording medium readable by a processor included in a motor driving apparatus or a home appliance. The processor-readable recording medium includes all kinds of recording apparatuses in which data that can be read by the processor is stored.

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 (10)

A converter for converting input AC power into DC power;
A switching unit disposed at a front end of the converter and having a resistance element and a relay element connected in parallel to each other;
An inverter disposed at an output terminal of the converter and having a plurality of switching elements for converting a first DC power from the converter into an AC power by a switching operation and outputting the converted AC power to the motor;
A rectifier connected in parallel to the converter or the switching unit, for rectifying the input AC power;
A power down unit disposed at an output terminal of the rectifying unit to step down the second direct current power from the rectifying unit and output operation power to the inverter;
When the level of the first DC power supply is equal to or lower than the second level and the level of the second DC power supply is equal to or higher than the third level during a power failure, And a controller for controlling the relay element to be turned off and controlling the output of the inverter to be stopped. The method according to claim 1,
A first dc capacitor disposed at an output of the converter for storing a first dc power source from the converter;
A first dc voltage detecting unit detecting the first dc voltage stored in the first dc capacitor;
A second dc capacitor disposed at an output terminal of the rectifying unit and storing a second DC power from the rectifying unit;
And a second dc voltage detecting unit detecting the second dc voltage stored in the second dc capacitor. The method according to claim 1,
And an input current detector for detecting an input current based on the input AC power,
Wherein,
And when the level of the input current detected by the input current detecting unit is equal to or lower than the first level, the motor driving apparatus determines that the power failure has occurred. The method according to claim 1,
And an output current detector for detecting an output current flowing between the motor and the inverter,
Wherein,
And outputs a switching control signal to the inverter based on the detected output current. The method according to claim 1,
The power down /
And outputs the operating power to the inverter continuously during the power failure. The method according to claim 1,
The switching unit includes:
Supplying the input power to the converter through the resistor element during the power failure,
And supplies the input power to the converter through the relay element which is turned on when the current is not the power failure. The method according to claim 1,
Wherein the level change rate of the first DC power supply is greater than the level change rate of the second DC power supply during the power failure. 3. The method of claim 2,
Wherein a capacitance of the first dc-terminal capacitor is smaller than a capacitance of the second dc-terminal capacitor. A converter for converting input AC power into DC power;
A switching unit disposed at a front end of the converter and having a resistance element and a relay element connected in parallel to each other;
An inverter disposed at an output terminal of the converter and having a plurality of switching elements for converting a first DC power from the converter into an AC power by a switching operation and outputting the converted AC power to the motor;
A rectifier connected in parallel to the converter or the switching unit, for rectifying the input AC power;
A power down unit disposed at an output terminal of the rectifying unit to step down the second direct current power from the rectifying unit and output operation power to the inverter;
A controller for controlling the relay element to be turned off and controlling the output of the inverter to be stopped when the level of the first DC power supply is equal to or lower than a first level and the level of the second DC power supply is equal to or higher than a second level; The motor driving apparatus comprising: A home appliance comprising the motor drive device according to any one of claims 1 to 9.

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