KR101936641B1 - Power converting apparatus and home appliance including the same - Google Patents

Abstract

The present invention relates to a power conversion apparatus and a home appliance having the power conversion apparatus. A power conversion apparatus according to an embodiment of the present invention includes an inverter having a plurality of sag-lock switching elements and a plurality of down-arm switching elements, and a plurality of s-arm gates And a power source voltage step-down unit for outputting different voltage levels to the plurality of squeeze gate drive units. Thus, the electromagnetic noise generated when the inverter is turned on or off can be reduced without changing the switching frequency.

Description

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power conversion device and a home appliance having the power conversion device, and more particularly, to a power conversion device capable of reducing electromagnetic interference (EMI) noise generated when the inverter is turned on or off, And a home appliance having the same.

The power conversion apparatus is a device that converts supplied power and outputs the converted power.

As an example of the power conversion apparatus, an inverter that converts a DC power source to an AC power source can be exemplified.

On the other hand, electromagnetic noise (EMI) is generated when the inverter is turned on or off, specifically, when the switching element is turned on or off.

Various studies have been attempted to reduce such electromagnetic noise.

On the other hand, Korean Patent Laid-Open No. 2003-0026211 has a separate circuit for frequency modulation phase delay in accordance with the switching frequency change in order to reduce electromagnetic noise. However, such a circuit may cause problems such as increased complexity, increased manufacturing cost, and the like.

An object of the present invention is to provide a power conversion device capable of reducing electromagnetic noise generated upon turning on or off of an inverter without changing a switching frequency and a home appliance having the power conversion device.

According to an aspect of the present invention, there is provided a power conversion apparatus including: an inverter having a plurality of sag-lock switching elements and a plurality of down-arm switching elements; And a power source voltage step-down unit for outputting different voltage levels to the plurality of somen gate drive units.

According to another aspect of the present invention, there is provided a home appliance including: an inverter having a plurality of sagittal switching elements and a plurality of downward switching elements; A plurality of squeeze gate driving units for outputting different voltage levels to the plurality of squeeze gate driving units.

According to an aspect of the present invention, there is provided a power conversion apparatus and a home appliance having the same, including: an inverter having a plurality of sway-arc switching elements and a plurality of down-arm switching elements; A plurality of squeeze gate drivers for outputting signals, and a plurality of squeeze gate drivers for outputting different voltage levels. Thus, the electromagnetic noise generated when the inverter is turned on or off can be reduced without changing the switching frequency.

In particular, when a plurality of sag-carous switching elements are turned on, the rising times of the switching waveforms are set to be different from each other in accordance with gate driving signals of different levels outputted from the plurality of sag gate driving units, Electromagnetic noise is reduced.

Furthermore, the falling time of the switching waveforms is set differently according to the gate driving signals of different levels outputted from the plurality of the sway-rock gate drivers at the time of turn-off of the plurality of the s- The electromagnetic noise to be generated is reduced.

Meanwhile, a plurality of saddle-shaped resistive elements are disposed between the plurality of saddle-shaped switching elements and the plurality of saddle-shaped gate drivers. The resistance values of the plurality of saddle-shaped resistive elements may be different from each other. In this case, The rising waveform of the switching waveform is set to be different from the rising waveform of the switching waveform when the switching waveform is turned on at the time of the turn-on, thereby reducing the electromagnetic noise generated in the switching waveform.

On the other hand, the plurality of squeeze resistance elements may include a plurality of squeeze on resistance elements and a plurality of squeeze off resistance elements respectively connected to both ends of the plurality of squeeze ON resistance elements. According to this, The polling slope of the switching waveforms is different at the time of turn-off of the switching waveforms of the plurality of sod-like switching elements as well as at the turn-on time, so that the falling times of the switching waveforms are set to be different from each other, Noise is reduced.

On the other hand, the apparatus further includes a plurality of down-gate gate drivers for outputting gate drive signals to the gate terminals of the plurality of down-arm switching elements, and the power source down converter outputs different voltage levels to the plurality of down- The rise time or the falling time of the switching waveform of the switching elements and the plurality of down-arm switching elements are set to be different from each other, so that the electromagnetic noise generated in the switching waveform is reduced.

On the other hand, the apparatus further includes a plurality of down-gate gate drivers for outputting gate driving signals to the gate terminals of the plurality of down-arm switching elements, respectively, and the power source down converter outputs different voltage levels to the plurality of down- The rise time or the falling time of the switching waveform of the upper arc-shaped switching element and the plurality of lower-arm switching elements are set to be different from each other, thereby reducing the electromagnetic noise generated in the switching waveform.

1 illustrates an example of an internal block diagram of a power conversion apparatus according to an embodiment of the present invention.
2 is an example of an internal circuit diagram of the power conversion apparatus of FIG.
3 is an internal block diagram of the inverter control unit of FIG.
4A to 4C are diagrams referred to in describing the operation of a conventional power conversion apparatus.
5 is a diagram illustrating a power conversion apparatus according to an embodiment of the present invention.
FIG. 6 is a diagram referred to in describing an operation method of the power conversion apparatus of FIG. 5;
7 is a diagram illustrating a power conversion apparatus according to another embodiment of the present invention.
FIG. 8 is a diagram referred to in the description of the operation method of the power conversion apparatus of FIG. 7; FIG.
9 is a diagram illustrating a power conversion apparatus according to another embodiment of the present invention.
10 is a diagram referred to in the description of the operation method of the power conversion apparatus of FIG.
11 is a view illustrating a power conversion apparatus according to another embodiment of the present invention.
FIG. 12 is a diagram referred to in the description of the operation method of the power conversion apparatus of FIG.
13 is a perspective view illustrating a laundry processing apparatus, which is an example of a home appliance according to an embodiment of the present invention.
14 is an internal block diagram of the laundry processing apparatus of FIG.
FIG. 15 is a diagram illustrating a configuration of an air conditioner, which is another example of a home appliance according to an embodiment of the present invention.
16 is a schematic view of the outdoor unit and the indoor unit of Fig.
17 is a perspective view illustrating a refrigerator that is another example of a home appliance according to an embodiment of the present invention.
Fig. 18 is a view schematically showing the configuration of the refrigerator of Fig. 17;

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 power conversion device 220 according to the embodiment of the present invention may include an inverter for driving the motor. Accordingly, the power conversion device 220 may be referred to as a motor drive device.

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

The power converter 220 according to the embodiment of the present invention includes a converter 410, a dc capacitor C, an inverter 420, an inverter controller 430, (445).

Meanwhile, the power conversion device 220 according to the embodiment of the present invention may further include a dc voltage detection unit B and an output current detection unit E. The power conversion device 220 may further include an input current detection unit A, a reactor L, and the like.

Meanwhile, the power converter 220 according to the embodiment of the present invention can use a small capacity dc single capacitor C, which is called capacitorless. In this case, the both-end voltage of the dc short-circuit capacitor C may be pulsated.

On the other hand, the inverter 420 may include a plurality of high-arc switching elements and a plurality of down-arm switching elements.

On the other hand, when a plurality of sag lock switching elements in the inverter 420 are turned on at the same time, or when a plurality of down-arm switching elements are turned on at the same time, switching elements having the same rising time A waveform will be generated. As a result, electromagnetic noise (EMI) due to the same rising time occurs.

The present invention proposes a solution for solving this problem.

The power conversion device 220 according to the embodiment of the present invention includes an inverter 220 having a plurality of upper arc rocking switches Sa, Sb, Sc and a plurality of lower arm switching devices S'a, S'b, S'c, A plurality of squeeze gate drivers GDa, GDb and GDc for outputting gate drive signals to the gate terminals of the plurality of squeeze switching elements Sa, Sb and Sc, , GDb, and GDc. The power supply voltage step-down unit 445 outputs different voltage levels. Thus, the electromagnetic noise generated when the inverter 420 is turned on or off can be reduced without changing the switching frequency.

Particularly, when the turn-on of the plurality of sod-shaped switching elements Sa, Sb and Sc, the rising time of the switching waveform (for example, rising time are set to be different from each other, the electromagnetic noise generated in the switching waveform is reduced.

Further, according to the gate driving signals of different levels outputted from the plurality of sway gates gate drivers GDa, GDb and GDc at the time of turn-off of the plurality of sod-arc switching elements Sa, Sb and Sc, (falling time) are set to be different from each other, the electromagnetic noise generated in the switching waveform is reduced.

A plurality of squeeze resistance elements are disposed between the plurality of squeeze switching elements Sa, Sb and Sc and the plurality of squeeze gate drivers GDa, GDb and GDc, In this case, since the rising slope of the switching waveforms Sa, Sb, and Sc of the switching elements Sa, Sb, and Sc varies when the switching waveform is turned on at the time of turning on, the rising time of the switching waveforms As a result, the electromagnetic noise generated in the switching waveform is reduced.

On the other hand, the plurality of squeeze resistance elements include a plurality of upper arc on resistance elements (Raon, Rbon, Rcon) and a plurality of upper arc on resistance elements (Raon, Rbon, Rcon) Sa, Sb and Sc of the plurality of sod rock switching elements Sa, Sb and Sc as well as the turn-on of the plurality of sod rock switching elements Sa, Sb and Sc, The polling slope of the switching waveform is changed when the switching waveform is polled, so that the falling time of the switching waveform is set to be different from each other, thereby reducing the electromagnetic noise generated in the switching waveform.

On the other hand, a plurality of down-gate gate drivers (GDd, GDe, GDf) for outputting gate driving signals are respectively connected to the gate terminals of the plurality of down-arm switching elements S'a, S'b, S'c, Sb and Sc and a plurality of down-arm switching elements S'a and S ', by outputting different voltage levels to the plurality of down-gate gate drivers GDd, GDe and GDf, b, S'c) of the switching waveform are different from each other, so that the electromagnetic noise generated in the switching waveform is reduced.

On the other hand, a plurality of down-gate gate drivers (GDd, GDe, GDf) for outputting gate driving signals are respectively connected to gate terminals of the plurality of down-arm switching elements (S'a, S'b, S'c) The step-down unit outputs a plurality of different-level voltage levels to the plurality of down-gate gate drivers GDd, GDe and GDf to generate a plurality of lower-arm switching elements Sa, Sb and Sc and a plurality of lower- 'b, S'c) of the switching waveform are set different from each other, the electromagnetic noise generated in the switching waveform is reduced.

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

The reactor L is disposed between the commercial AC power source 405 (v _s ) and the converter 410, and performs a power factor correcting or boosting 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 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 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 commercial AC power source 405, which has passed through the reactor L, into DC power and outputs the DC power. 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 . 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 dc single capacitor C smoothes the input power supply and stores it. In the figure, one element is exemplified by the dc-terminal capacitor C, but a plurality of elements are provided, thereby ensuring the element stability.

For example, when the DC power from the solar cell is supplied to the dc capacitor C, the dc capacitor C is connected to the output terminal of the converter 410. However, the present invention is not limited thereto, Or may be DC / DC converted and input. Hereinafter, the portions illustrated in the drawings are mainly described.

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

the dc short-circuit voltage detector B can detect the dc short-circuit voltage Vdc at both ends of the dc short-circuit 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 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. [ As a result, the three-phase alternating-current power supply of the variable 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. For this, the inverter control unit 430 can receive the output current io 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 output based on the output current io detected by the output current detection section E as a switching control signal of the pulse width modulation method (PWM). Detailed operation of outputting 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 a phase current flowing between the three-phase motors 230, that is, an output current io.

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 detection unit E is disposed between the dc short-circuit capacitor C and the inverter 420 and includes a single shunt resistor Rs to control the current flowing through the motor 230 . 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 io 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 io .

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 power source voltage step-down unit 445 steps down the level of the input DC power and outputs a DC voltage that has been reduced.

For example, when the power down unit 445 is connected to both ends of the dc short-circuit capacitor C disposed between the converter 410 and the inverter 420 as shown in Fig. 2, the dc short- It is possible to level-down and output the direct-current power between approximately 200 and 370 V, which is a both-end voltage, with a direct-current power between approximately 5 V and 20 V.

On the other hand, the power output from the power down unit 445 can be used as an operation power supply for the inverter control unit 430, and an operation power supply for the gate drive unit described later with reference to FIG.

Meanwhile, the power down unit 445 according to the embodiment of the present invention can output different voltage levels (V1 to V3) to the plurality of silevel gate drivers GDa, GDb, and GDc. Thus, the electromagnetic noise generated when the inverter 420 is turned on or off can be reduced without changing the switching frequency.

Particularly, when the turn-on of the plurality of sod-shaped switching elements Sa, Sb and Sc, the rising time of the switching waveform (for example, rising time are set to be different from each other, the electromagnetic noise generated in the switching waveform is reduced.

Further, according to the gate driving signals of different levels outputted from the plurality of sway gates gate drivers GDa, GDb and GDc at the time of turn-off of the plurality of sod-arc switching elements Sa, Sb and Sc, (falling time) are set to be different from each other, the electromagnetic noise generated in the switching waveform is reduced.

On the other hand, the power source voltage-down unit 445 may output the voltage V4 different from the voltage level supplied to the plurality of silevel gate drivers GDa, GDb, and GDc to the low-gate gate driver GDx. The rising time or the polling time of the switching waveforms of the plurality of the upper arm switching elements Sa, Sb and Sc and the plurality of lower arm switching elements S'a, S'b and S'c falling time are set to be different from each other, the electromagnetic noise generated in the switching waveform is reduced.

On the other hand, the power source voltage-down unit 445 can output different voltage levels (V4 to V6) to the plurality of down-gate gate drivers GDd, GDe, and GDf. The rising time or the polling time of the switching waveforms of the plurality of the upper arm switching elements Sa, Sb and Sc and the plurality of lower arm switching elements S'a, S'b and S'c falling time are set to be different from each other, the electromagnetic noise generated in the switching waveform is reduced.

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

3, the inverter control unit 430 includes an axis conversion unit 510, a speed calculation unit 520, a current command generation unit 530, a voltage command generation unit 540, an axis conversion unit 550, And a switching control signal output unit 560.

The axial conversion unit 510 can convert the output currents ia, ib, ic detected by the output current detection unit E into the two-phase currents iα, iβ of the stationary coordinate system.

On the other hand, the axial conversion unit 510 can convert the two-phase current i?, I? Of the still coordinate system into the two-phase current id, iq of the rotational 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 detection section (E), the speed calculation section (520)

), 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(530)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 section 530 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 unit 530 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 unit 530 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 generation unit 540 generates the voltage command generation unit 540 based on the d-axis and q-axis currents (i _d , i _q ) axially transformed into the two-phase rotational coordinate system in the axial conversion 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 540 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 . Further, voltage command generation unit 540, on the basis of the difference between the d-axis current (i _d) and, the d-axis current command value (i ^* _d), and performs the PI control in the PI controller (348), d-axis voltage It is possible to generate the command value v ^* _d . The voltage command generator 540 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 , v ^* _q ) are input to the axial conversion unit 550.

)와, d축, q축 전압 지령치(v^* _d,v^* _q)를 입력받아, 축변환을 수행한다.The axis transforming unit 550 transforms the position computed by the velocity computing unit 520

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

)가 사용될 수 있다.First, the axis converting unit 550 performs conversion from a two-phase rotating coordinate system to a two-phase stationary coordinate system. At this time, the position computed by the speed calculator 520

) Can be used.

Then, the axis converting unit 550 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 unit 560 generates an inverter switching control signal Sic according to the pulse width modulation (PWM) method based on the three-phase output voltage set values v ^* a, v ^* b and v ^* c 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.

4A to 4C are diagrams referred to in describing the operation of a conventional power conversion apparatus.

First, FIG. 4A shows a conventional power conversion device 220x.

An inverter 420x having a plurality of sag-lock switching elements Sa to Sc and lower arm switching elements S'a to S'c and a plurality of gate drivers GDax, GDcx, GDcx and GDxx, A device Rx may be disposed. At this time, the resistance value of each resistance element Rx may be the same.

A plurality of switching elements Sa-Sc, S'a-S 'are formed by gate driving signals output from the plurality of gate driving sections GDax, GDcx, GDcx, GDxx when the resistance values of the respective resistance elements Rx are the same, c, the rising times of the switching waveforms are all the same during the Pxaa period as shown in FIG. 4B.

Therefore, during the Pxaa period, the level of the power Pxa consumed in the plurality of switching elements sharply increases as shown in (b) of FIG. 4B. In the Pxaa period, as shown in (c) (Noa) level is rapidly increased. That is, there may be a problem that a sudden electromagnetic noise is generated during the Pxaa period.

On the other hand, when the resistance values of the resistive elements Rx are the same, a plurality of switching elements Sa to Sc, S'a to Sc, and S'a to Sc 'are turned on by the gate driving signals output from the plurality of gate drivers GDax, GDcx, GDcx, During the Pxab period, the fall time of the switching waveform is all the same at the turn-off of the switching waveform S'c as shown in FIG. 4B.

4B, during the Pxab period, the level of the power Pxa consumed in the plurality of switching elements sharply increases, and during the Pxab period as shown in FIG. 4B (c), the electromagnetic noise (Noa) level is rapidly increased. That is, there may be a problem that a sudden electromagnetic noise is generated during the Pxaa period.

On the other hand, similar to FIG. 4B, FIG. 4C shows a state where a plurality of switching elements Sa to Sc, S'a to S'c are turned on or off, that is, during the Pxba period or the Pxbb period, The level of the consumed power Pxb is rapidly increased in the device, and the level of the electromagnetic noise Nob rapidly increases.

4B, the switching speed of the plurality of switching elements Sa to Sc, S'a to S'c in FIG. 4B is faster. In this case, however, the switching loss, that is, the power consumption is reduced, Is higher than that of the second embodiment.

On the other hand, the switching speed of the plurality of switching elements Sa to Sc, S'a to S'c in FIG. 4C is slower than in FIG. 4B. In this case, the level of electromagnetic noise becomes small, , The power consumption is further increased.

Accordingly, the present invention proposes a method of varying the rising time, the polling time, and the like of the switching waveform by varying the level of the gate driving voltage supplied to the gate driver. This will be described with reference to FIG.

FIG. 5 is a diagram illustrating a power conversion apparatus according to an embodiment of the present invention, and FIG. 6 is a diagram referred to in describing an operation method of the power conversion apparatus of FIG.

5, the power converter 220a includes a plurality of high-to-low switching elements Sa, Sb, and Sc and a plurality of down-arm switching elements S'a, S'b, and S'c A plurality of squeeze gate drivers GDa, GDb and GDc for outputting gate drive signals to the gate terminals of the plurality of squeeze switching elements Sa, Sb and Sc, GDa, GDb, and GDc. The power supply voltage step-down unit 445 outputs different voltage levels.

The power source voltage step-down unit 445 steps down the level of the input DC power and outputs a DC voltage that has been reduced.

For example, when the power down unit 445 is connected to both ends of the dc short-circuit capacitor C disposed between the converter 410 and the inverter 420 as shown in Fig. 2, the dc short- It is possible to level-down and output the direct-current power between approximately 200 and 370 V, which is a both-end voltage, with a direct-current power between approximately 5 V and 20 V.

On the other hand, the power output from the power down unit 445 can be used as an operation power supply for the inverter control unit 430, and an operation power supply for the gate drive unit described later with reference to FIG.

Meanwhile, the power down unit 445 according to the embodiment of the present invention can output different voltage levels (V1 to V3) to the plurality of silevel gate drivers GDa, GDb, and GDc. Thus, the electromagnetic noise generated when the inverter 420 is turned on or off can be reduced without changing the switching frequency.

In particular, as shown in FIG. 6, in response to the gate driving signals of different levels outputted from the plurality of silevel gate drivers GDa, GDb, and GDc of the plurality of sod rock switching elements Sa, Sb and Sc on the turn- The rising time of the waveform may be different from T1 to T2 and T3. As a result, in the switching waveforms flowing through the plurality of upper-arm switching elements Sa, Sb and Sc, the overlapped portion becomes smaller, so that the electromagnetic noise is reduced.

Further, in response to the gate drive signals of the different levels (V1 to V3) output from the plurality of sway gates gate drivers GDa, GDb and GDc at the time of turn-off of the plurality of sod-arc switching elements Sa, Sb and Sc, As shown in Fig. 6, the falling time of the switching waveform may be different from T1 to T2 and T3. As a result, in the switching waveforms flowing through the plurality of upper-arm switching elements Sa, Sb and Sc, the overlapped portion becomes smaller, so that the electromagnetic noise is reduced.

In Fig. 6, the magnitude of the power supply level increases from V1 to V3 to V3, and accordingly, the rising time increases from T1 to T3 to T3.

On the other hand, the power source voltage-down unit 445 may output the voltage V4 different from the voltage level supplied to the plurality of silevel gate drivers GDa, GDb, and GDc to the low-gate gate driver GDx.

According to this, the rising time or falling time of the switching waveform of the plurality of down-arm switching elements S'a, S'b, S'c is set to T4 as shown in Fig. 6, T1, T2, and T3, which are the rising time or falling time of the switching waveform of the upper arm switching elements Sa, Sb, and Sc of the switching elements Sa, Sb, and Sc. As a result, the electromagnetic noise generated in the switching waveforms of the plurality of down-arm switching elements S'a, S'b, S'c is reduced.

On the other hand, the above-described rising time and polling time of the switching waveform are influenced by the resistance value of the resistance element disposed between the gate driving unit and the switching element, in addition to the level of the DC power supply output from the power down unit 445 .

The resistance element disposed between the gate driver and the switching element may include an on resistance element and an off resistance element connected in parallel to both ends of the on resistance element, as shown in Fig.

The power conversion device 220a of FIG. 5 includes a plurality of upper arc on-resistance elements Raon, Rbon, and Gdb disposed between the plurality of upper arc rocking switches Sa, Sb, Sc and the plurality of silevel gate drivers GDa, GDb, , Rcon). At this time, the resistance values of the high-resistance on-resistance elements (Raon, Rbon, Rcon) may all be the same.

Accordingly, as shown in Fig. 6, at each of the rising times T1 to T3, the respective rising slopes become equal to each other.

On the other hand, a plurality of high-temperature on-resistance elements (Raon, Rbon, Rcon), a plurality of high-side on-diode elements (Daon, Dbon, Dcon) are arranged.

A plurality of on-off resistors (Raoff, Rboff, Rcoff) and a plurality of on-off resistors (Raon, Rbon, Rcon) and a plurality of on- Off diodes (Daoff, Dboff, Dcoff) may be arranged.

The first to third gate drivers GDa, GDb and GDc output the gate driving signals to the plurality of sod rock switching elements Sa, Sb and Sc, respectively, .

The power converter 220a of FIG. 5 further includes a plurality of upper-arm off-resistance elements (Raoff, Rboff, Rcoff) connected to both ends of a plurality of on-state on resistance elements Raon, .

At this time, the resistance values of the plurality of on-off resistors (Raoff, Rboff, Rcoff) may be the same. Accordingly, as shown in FIG. 6, at the polling times T1 to T3, the respective polling slopes become the same.

On the other hand, the power conversion device 220a includes a plurality of down-arm ON resistance elements Ra'on, Ra'on, and Ra'on disposed between the plurality of down-arm switching elements S'a, S'b, S'c and the bottom- Rb'on, Rc'on). At this time, the resistance values of the resistance elements Ra'on, Rb'on, and Rc'on may all be the same.

Accordingly, as shown in Fig. 6, at the rising time T4, the respective rising slopes become equal to each other.

On the other hand, the power conversion device 220a of FIG. 5 includes a plurality of down-arm resistance elements Ra'off, Ra'off, Ra'off, and Ra'off, which are connected to both ends of a plurality of down- Rb'off, Rc'off).

At this time, the resistance values of the plurality of lower arm resistance elements (Ra'off, Rb'off, Rc'off) may all be the same. Accordingly, as shown in Fig. 6, at the polling time T4, the polling slopes are all the same.

On the other hand, a plurality of downham-on resistive elements (Ra'on, Rb'on, Rc'on), and a plurality of down-gate resistive elements (Ra'on, Rb'on, Rc'on) A plurality of down-arm diode elements Da'on, Db'on, and Dc'on are arranged.

A plurality of down-arm resistance elements (Ra'on, Rb'on, Rc'on) and a plurality of down-arm diode elements (Da'on, Db'on, Dc'on) Elements Ra'off, Rb'off, and Rc'off, and a plurality of load-lamp-off diode elements Da'off, Db'off, and Dc'off may be disposed.

The lower gate gate driving unit GDx, that is, the fourth gate driving unit GDx, can output gate driving signals to the plurality of lower arm switching elements S'a, S'b and S'c, respectively.

FIG. 7 is a view illustrating a power conversion apparatus according to another embodiment of the present invention, and FIG. 8 is a diagram referred to in describing an operation method of the power conversion apparatus of FIG.

7, the power conversion apparatus 220a of FIG. 7 is similar to the power conversion apparatus 220a of FIG. 5 except that a resistance value of a plurality of siderium on resistance elements Raon, Rbon, Rcon and a plurality of sine- The resistance elements (Raoff, Rboff, Rcoff) are different from each other.

Accordingly, when the plurality of upper arc on-resistance elements (Raon, Rbon, Rcon) and the plurality of upper arc on resistance elements Raoff, Rboff, Rcoff) are different from each other, so that the rising or the falling slope can be changed within each rising or polling time, as shown in FIG.

Accordingly, in FIG. 8, T1a, T2a, and T3a are exemplified by a rising time and a polling time for the plurality of upper arc rocking switches Sa, Sb, and Sc.

On the other hand, in FIG. 7, the resistance values of the plurality of down-arm resistance elements Ra'on, Rb'on and Rc'on and the plurality of the lower-arm resistance elements Ra'off, Rb'off, 8A and 8B illustrate that the rising time and polling time for the plurality of down arm switching elements S'a, S'b, and S'c are T4a.

On the other hand, unlike in FIG. 7, the resistance values of a plurality of down-arm resistance elements Ra'on, Rb'on and Rc'on and the plurality of down-arm resistance elements Ra'off, Rb'off and Rc'off , But different ones are possible.

FIG. 9 is a view illustrating a power conversion apparatus according to another embodiment of the present invention, and FIG. 10 is a diagram referred to in describing an operation method of the power conversion apparatus of FIG.

9, the power conversion device 220b is similar to the power conversion device 220a of FIG. 5, except that a plurality of down-arm switching devices S'a, S'b, There is a difference in that the number of gate drivers for supplying signals is not three but three.

That is, the power conversion device 220b of FIG. 9 includes a plurality of down-gate gate drivers GDd (GDa), GDb GDe and GDf and the power source voltage down unit 445 can output different voltage levels V4 to V6 to the plurality of ram gate driving units GDd, GDe and GDf.

Particularly, the power source voltage down unit 445 can output different voltage levels (V4 to V6) different from the voltage levels (V1 to V3) supplied to the plurality of inlaid gate drivers GDa, GDb and GDc .

Accordingly, the electromagnetic noise generated when the inverter 420 is turned on or off can be reduced without changing the switching frequency.

Particularly, in accordance with gate drive signals of different levels outputted from the plurality of down-gate gate drivers GDd, GDe and GDf at the time of turn-on of the plurality of down-arm switching elements S'a, S'b and S'c, As shown in Fig. 10, the rising time of the switching waveform may be different from T4, T5 and T6. Accordingly, in the switching waveforms flowing through the plurality of down-arm switching elements S'a, S'b, and S'c, the overlapped portion becomes smaller, so that electromagnetic noise is reduced.

Further, when the plurality of down-arm switching elements S'a, S'b, S'c are turned off, the voltages of the different levels (V4 to V6) outputted from the plurality of the ram gate driving sections GDd, GDe, GDf According to the gate driving signal, the falling time of the switching waveform may be different from T4, T5 and T6 as shown in Fig. Accordingly, in the switching waveforms flowing through the plurality of down-arm switching elements S'a, S'b, and S'c, the overlapped portion becomes smaller, so that electromagnetic noise is reduced.

In Fig. 10, the magnitude of the power supply level increases from V4 to V6 to V4, and accordingly, the rising time increases from T4 to T6 to T6.

In the power converter 220a of Fig. 9, the resistance values of the lower-am resistance elements Ra'on, Rb'on, and Rc'on may all be the same.

Accordingly, as shown in Fig. 10, at each of the rising times T4 to T6, the respective rising tilts are the same.

On the other hand, the resistance values of the plurality of lower arm resistance elements (Ra'off, Rb'off, Rc'off) may all be the same. Accordingly, as shown in Fig. 10, at the polling times T4 to T6, the respective polling slopes become all the same.

FIG. 11 is a view illustrating a power conversion apparatus according to another embodiment of the present invention, and FIG. 12 is a diagram referred to in describing an operation method of the power conversion apparatus of FIG.

Referring to FIG. 11, the power conversion device 220a of FIG. 11 is similar to the power conversion device 220a of FIG. 9, except that the resistance values of a plurality of on-state on resistance devices Raon, The resistance elements (Raoff, Rboff, Rcoff) are different from each other.

Accordingly, when the plurality of upper arc on-resistance elements (Raon, Rbon, Rcon) and the plurality of upper arc on resistance elements Raoff, Rboff, Rcoff) are different from each other, so that the rising slope or the polling slope can be changed within each rising or polling time, as shown in Fig.

12, T1b, T2b, and T3b are exemplified by a rising time and a polling time for the plurality of upper arc rocking switches Sa, Sb, and Sc.

On the other hand, in FIG. 11, the resistance values of the plurality of down-arm resistance elements Ra'on, Rb'on and Rc'on and the plurality of the down-arm resistance elements Ra'off, Rb'off and Rc'off, Illustrate the different things. 12, T4b, T5b, and T6b are exemplified by a rising time and a polling time for the plurality of lower arm switching elements S'a, S'b, and S'c.

As described above, by varying the resistance values of the resistance elements while varying the voltage levels of the gate driving signals, the electromagnetic noise can be further reduced.

Meanwhile, the power conversion device 220 described above can be applied to various electronic devices. 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 power conversion device 220 will be described below.

13 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. 13 is a laundry laundry processing apparatus, which comprises a cabinet 110 that forms an outer appearance of the laundry processing apparatus 100a, and a cabinet 110 which is disposed inside the cabinet 110 and supported by 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.

14 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 power conversion 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 controller 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 quantity of the motor.

FIG. 15 is a diagram illustrating a configuration of an air conditioner, which 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.

16 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. 15 can be driven by a power conversion 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 power conversion device, such as the one shown in Fig. 1, which drives the indoor fan motor 109bb and the outdoor fan motor 150bb, respectively.

17 is a perspective view illustrating a refrigerator that is 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 beverage 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. 18 is a view schematically showing the configuration of the refrigerator of Fig. 17;

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. 18 may be driven by a power conversion device, such as Fig. 1, which drives a compressor motor.

Alternatively, a refrigerator compartment fan (not shown) or a freezer compartment fan 144c may be driven by a power conversion 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 power conversion apparatus and the home appliance having the power conversion apparatus according to the embodiment of the present invention are not limited to the configuration and method of the embodiments described above, All or some of the embodiments may be selectively combined.

Meanwhile, the motor driving method or the operation method of the home appliance of the present invention can be implemented as a processor-readable code on a processor-readable recording medium provided in a power conversion 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 (11)

An inverter having a plurality of sag-lock switching elements and a plurality of down-arm switching elements;
A plurality of squeeze gate drivers for respectively outputting gate driving signals to gate terminals of the plurality of squeeze switching elements;
And a power down unit for outputting different voltage levels to the plurality of sway gate driving units. The method according to claim 1,
And a plurality of squeeze resistance elements disposed between the plurality of squeeze switching elements and the plurality of squeeze gate drivers,
Wherein resistance values of the plurality of squeeze resistance elements are different from each other. 3. The method of claim 2,
Wherein the plurality of squeeze resistance elements comprise:
And a plurality of upper arc on resistance elements connected to both ends of the plurality of upper arc on resistance elements, respectively. The method of claim 3,
Resistance values of the plurality of on-resistance on-resistance elements are different from each other,
Wherein resistance values of the plurality of on-off resistive elements are different from each other. The method according to claim 1,
And a low-amorphous gate driver for outputting a gate driving signal to gate terminals of the plurality of lower arm switching elements,
The power down /
And outputs a voltage different from a voltage level supplied to the plurality of silevel gate driving units to the ram gate driving unit. The method according to claim 1,
And a plurality of down-gate gate drivers for respectively outputting gate driving signals to gate terminals of the plurality of down-arm switching elements,
The power down /
And outputs a different voltage level to the plurality of ram block gate drive units. The method according to claim 6,
The power down /
And outputs a different voltage level to the plurality of silevel gate drivers and the plurality of downham gate drivers for outputting gate drive signals at different levels. The method according to claim 6,
And a plurality of down-arm resistance elements disposed between the plurality of down-arm switching elements and the plurality of down-gate gate drivers,
Wherein resistance values of the plurality of lower-arm resistance elements are different from each other. 9. The method of claim 8,
The plurality of lower-arm resistance elements comprise:
And a plurality of lower-arm resistance elements connected to both ends of the plurality of lower-arm ON resistance elements, respectively. 10. The method of claim 9,
The resistance values of the plurality of downham-on resistive elements are different from each other,
Wherein resistance values of the plurality of lower-arm resistance elements are different from each other. A home appliance comprising the power conversion device according to any one of claims 1 to 10.

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