KR20190107993A - Power converting apparatus and home appliance including the same - Google Patents

Abstract

The present invention relates to a power converting device and a home appliance having the same. According to an embodiment of the present invention, the power converting device comprises: a filter unit filtering input alternating current (AC) power; a first impedance unit arranged between an input terminal and an output terminal of the filter unit; and a second impedance unit arranged between the output terminal and a grounding terminal of the filter unit. Therefore, electromagnetic wave noise can be effectively reduced.

Description

Power converting apparatus and home appliance having the same {Power converting apparatus and home appliance including the same}

The present invention relates to a power conversion device and a home appliance having the same, and more particularly, to a power conversion device capable of efficiently reducing electromagnetic interference EMI and a home appliance having the same.

The power converter is a device that converts and outputs the supplied electric power.

As an example of the power converter, an inverter for converting DC power into AC power may be exemplified.

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

Various studies have been attempted to reduce such electromagnetic noise.

On the other hand, Korean Patent Publication No. 2003-0026211, in order to reduce the electromagnetic noise, according to the switching frequency change, a separate circuit for the frequency modulation phase delay. However, due to such a circuit, problems such as increased complexity and increased manufacturing cost may occur.

An object of the present invention relates to a power converter that can effectively reduce electromagnetic noise and a home appliance having the same.

On the other hand, another object of the present invention relates to a power converter that can replace the wire core disposed between the filter portion and the ground terminal and a home appliance having the same.

Power conversion device according to an embodiment of the present invention for achieving the above object, the filter unit for filtering the input AC power, the first impedance unit disposed between the input terminal and the ground terminal of the filter unit, the output terminal and the ground terminal of the filter unit It has a 2nd impedance part arrange | positioned in between.

On the other hand, the power conversion device according to an embodiment of the present invention, a converter for converting the AC power filtered by the filter unit to the DC power supply, a dc stage capacitor disposed in the output terminal of the converter, and a plurality of switching elements, switching The operation further includes an inverter for converting the DC power of the dc terminal capacitor into the AC power.

The first impedance unit may include a first resistor element and a first inductor, and the second impedance unit may include a second resistor element and a second inductor.

On the other hand, the first resistance element and the first inductor are connected in parallel, and the second resistance element and the second inductor are connected in parallel.

On the other hand, the resistance values of the first resistive element and the second resistive element correspond to a quality factor.

Meanwhile, impedances of the first inductor and the second inductor may have impedances corresponding to noise.

Meanwhile, impedances of the first impedance unit and the second impedance unit may be the same.

Meanwhile, the power converter according to the embodiment of the present invention may further include a wire core disposed at the front end of the filter unit.

Meanwhile, the filter unit, the first impedance unit, the second impedance unit, the converter, the dc terminal capacitor, and the inverter may be mounted on the same substrate.

On the other hand, the filter unit is disposed between the first capacitor unit having a plurality of capacitors, the second capacitor unit having a plurality of capacitors, disposed in the output terminal, and disposed between the first capacitor unit and the second capacitor unit Ferrite may be provided.

On the other hand, the power conversion device according to another embodiment of the present invention, the filter unit for filtering the input AC power source, the first impedance unit disposed between the input terminal and the ground terminal of the filter unit, and disposed between the output terminal and the ground terminal of the filter unit The second impedance part may include a first impedance part and a second impedance part, each having a resistance element and an inductor, and the filter part, the first impedance part, and the second impedance part may be mounted on the same substrate.

According to an embodiment of the present invention, a power converter and a home appliance having the same include: a filter unit for filtering input AC power, a first impedance unit disposed between an input terminal and a ground terminal of the filter unit, an output terminal of the filter unit, And a second impedance part disposed between the ground terminals. Thereby, electromagnetic wave noise can be reduced efficiently.

Meanwhile, the first impedance unit may include a first resistor element and a first inductor, and the second impedance unit may include a second resistor element and a second inductor, and thus may be disposed between the filter unit and the ground terminal. It is possible to replace the wire core.

In particular, resistance values of the first resistor element and the second resistor element may correspond to a quality factor, and impedances of the first inductor and the second inductor may have impedances corresponding to noise. As a result, the first impedance portion and the second impedance portion can reduce the production cost while efficiently reducing the electromagnetic noise.

Meanwhile, the filter unit, the first impedance unit, the second impedance unit, the converter, the dc terminal capacitor, and the inverter may be mounted on the same substrate. This makes it possible to effectively reduce electromagnetic noise for circuit elements arranged on the same substrate.

On the other hand, the filter unit is disposed between the first capacitor unit having a plurality of capacitors, the second capacitor unit having a plurality of capacitors, disposed in the output terminal, and disposed between the first capacitor unit and the second capacitor unit Ferrite may be provided. Accordingly, the input AC power can be filtered.

On the other hand, the power converter and the home appliance having the same according to another embodiment of the present invention, the filter unit for filtering the input AC power, the first impedance unit disposed between the input terminal and the ground terminal of the filter unit, the output terminal of the filter unit And a second impedance part disposed between the ground and the ground terminals, wherein the first impedance part and the second impedance part each include a resistance element and an inductor, and the filter part, the first impedance part, and the second impedance part are on the same substrate. Can be mounted on Thereby, electromagnetic wave noise can be reduced efficiently.

1 illustrates an example of an internal block diagram of a power conversion apparatus according to an embodiment of the present invention.
FIG. 2 is an example of an internal circuit diagram of the power converter of FIG. 1.
3 is an internal block diagram of the inverter controller of FIG. 2.
4A to 4B are views referred to for describing the operation of the conventional power converter.
5 is a view showing a power conversion apparatus according to an embodiment of the present invention.
6A through 8C are views for describing an operating method of the power converter of FIG. 5.
9 is a diagram illustrating a configuration of an air conditioner as an example of a home appliance according to an exemplary embodiment of the present invention.
10 is a schematic diagram of the outdoor unit and the indoor unit of FIG. 9.
11 is a perspective view illustrating a laundry treatment device as another example of a home appliance according to an exemplary embodiment of the present invention.
12 is an internal block diagram of the laundry treatment machine of FIG.
13 is a perspective view illustrating a refrigerator that is another example of a home appliance according to an exemplary embodiment of the present invention.
FIG. 14 is a view schematically illustrating the configuration of the refrigerator of FIG. 13.

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

The suffixes "module" and "unit" for components used in the following description are merely given in consideration of ease of preparation of the present specification, and do not impart any particular meaning or role by themselves. Therefore, the "module" and "unit" may be used interchangeably.

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

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

Referring to the drawings, the power conversion device 220 according to the embodiment of the present invention, the converter 410, a dc terminal capacitor (C), an inverter 420, and an inverter controller 430 Can be.

On the other hand, the power conversion device 220 according to an embodiment of the present invention may further include a dc terminal voltage detector (B), the output current detector (E). In addition, the power converter 220 may further include an input current detector A, a filter 500, and the like.

On the other hand, the power conversion device 220 according to an embodiment of the present invention, may be used a small capacity dc terminal capacitor (C), which is called a capacitorless (capacitorless). In this case, the voltage across the dc terminal capacitor C may pulsate.

The inverter 420 may include a plurality of upper arm switching elements and a plurality of lower arm switching elements.

On the other hand, according to the switching of the inverter 420, etc. in the power converter 220, electromagnetic noise (EMI) noise is generated. In particular, when the plurality of phase arm switching elements in the inverter 420 are turned on at the same time, or when the plurality of lower arm switching elements are turned on at the same time, the plurality of switching elements each have the same rising time. The waveform will be generated. This causes electromagnetic noise (EMI) noise due to the same rising time.

The present invention proposes a method for efficiently reducing such electromagnetic wave (EMI) noise.

Thus, the power converter 220 according to the embodiment of the present invention, the filter unit (500 of FIG. 5) for filtering the input AC power (Vs), the input terminal and the ground terminal ( A first impedance unit 540a disposed between GND1 and a second impedance unit 540b disposed between the output terminal of the filter unit 500 and the ground terminal GND2 are provided. Thereby, electromagnetic wave noise can be reduced efficiently. This will be described in detail with reference to FIG. 5 or below.

On the other hand, according to another embodiment of the present invention, the power converter 220, the filter unit 500 for filtering the input AC power (Vs), and between the input terminal and the ground terminal (GND1) of the filter unit 500 And a first impedance unit 540a disposed between the first impedance unit 540a and a second impedance unit 540b disposed between the output terminal of the filter unit 500 and the ground terminal GND2. The impedance unit 540b includes a resistor and an inductor, respectively, and the filter unit 500, the first impedance unit 540a, and the second impedance unit 540b may be mounted on the same substrate PCB. . Thereby, electromagnetic wave noise can be reduced efficiently. This will be described in detail with reference to FIG. 5 or below.

Hereinafter, the operation of each component unit in the power converter 220 of FIGS. 1 and 2 will be described.

The filter unit 500 may be disposed between the input AC power sources 405 and v _s and the converter 410 to filter the input AC power source Vs.

In particular, the filter unit 500 may include a passive circuit element or an active circuit element to reduce electromagnetic noise generated by a switching operation of the inverter 420 or the like.

For example, in order to reduce common mode noise, a plurality of circuit elements may be provided.

Specifically, as illustrated in FIG. 5, the filter unit 500 is disposed at an input terminal, and includes a first capacitor unit 510 including a plurality of capacitors, and a second capacitor unit disposed at an output terminal and including a plurality of capacitors. 520 and a ferrite FT disposed between the first capacitor portion 510 and the second capacitor portion 520.

In this case, the capacitance of the capacitor in the first capacitor unit 510 may be greater than the capacitance of the capacitor of the second capacitor unit 520. As a result, electromagnetic noise of AC power input to the filter unit 500 can be reduced over a wide band.

The input current detector A can detect the input current i _s input from the input AC power supply 405. To this end, a CT (current trnasformer), a shunt resistor, or the like may be used as the input current detector A. FIG. The detected input current i _s may be input to the inverter controller 430 as a discrete signal in the form of a pulse.

The converter 410 converts the input AC power supply 405 which passed through the filter part 500 into DC power, and outputs it. In the drawing, the input AC power source 405 is shown as a single phase AC power source, but may be a three phase AC power source. The internal structure of the converter 410 also varies according to the type of the input AC power source 405.

Meanwhile, the converter 410 may be formed of a diode or the like without a switching element, and may perform rectification without a separate switching operation.

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

On the other hand, the converter 410, for example, a half-bridge type converter that is connected to two switching elements and four diodes may be used, and in the case of a three-phase AC power supply, 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 improvement, and the DC power conversion may be performed by the switching operation of the switching element.

The dc terminal capacitor C smoothes the input power and stores it. In the figure, one device is exemplified by the dc terminal capacitor C, but a plurality of devices may be provided to ensure device stability.

On the other hand, in the drawing, but is illustrated as being connected to the output terminal of the converter 410, not limited to this, a direct current power may be input directly, for example, the direct current power from the solar cell is a dc terminal capacitor (C) It may be input directly to the DC or DC / DC conversion. Hereinafter, the parts illustrated in the drawings will be mainly described.

On the other hand, since the DC power is stored at both ends of the dc terminal capacitor C, this may be referred to as a dc terminal or a dc link terminal.

The dc end voltage detector B may detect a dc end voltage Vdc that is both ends of the dc end capacitor C. To this end, the dc terminal voltage detector B may include a resistor, an amplifier, and the like. The detected dc terminal voltage Vdc may be input to the inverter controller 430 as a discrete signal in the form of a pulse.

The inverter 420 includes a plurality of inverter switching elements, converts the smoothed DC power supply Vdc into three-phase AC power supplies va, vb and vc of a predetermined frequency by turning on / off an operation of the switching device, It may output to the synchronous motor 230.

Inverter 420 is a pair of upper arm switching elements Sa, Sb, Sc and lower arm switching elements S'a, S'b, S'c, which are connected in series with each other, and a total of three pairs of upper and lower arms The switching elements are connected in parallel with each other (Sa & S'a, Sb & S'b, Sc & S'c). Diodes are connected in anti-parallel to each of the switching elements Sa, S'a, Sb, S'b, Sc, and 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 AC power having a variable frequency is output to the three-phase synchronous motor 230.

The inverter controller 430 may control a switching operation of the inverter 420 based on a sensorless method. To this end, the inverter controller 430 may receive an output current io detected by the output current detector E. FIG.

The inverter controller 430 outputs an 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 a switching control signal of the pulse width modulation method PWM, and is generated and output based on the output current io detected by the output current detector E. FIG. A detailed operation of the output of the inverter switching control signal Sic in the inverter controller 430 will be described later with reference to FIG. 3.

The output current detector E may detect a phase current flowing between the three-phase motor 230, that is, the output current io.

The output current detector E may be disposed in the inverter 420 and the motor 230 to detect a current flowing in the motor 230 as shown in the figure.

The output current detector E may be provided with three resistance elements as shown in the figure. Through the three resistance elements, it is possible to detect a phase current (ia, ib, ic) which is an output current io flowing through the motor 230. The detected output currents ia, ib and ic may be applied to the inverter controller 430 as discrete signals in the form of pulses and are based on the detected output currents ia, ib and ic. The switching control signal Sic is generated.

In the present specification, ia, ib, ic or io is used as an output current.

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

On the other hand, unlike the figure, the output current detection unit E is disposed between the dc terminal capacitor C and the inverter 420, and has one shunt resistor element Rs to provide current flowing through the motor 230. It can also be detected. This method may be called a shunt method.

According to the one shunt method, the output current detection unit E uses the one shunt resistor element Rs to output the output current flowing through the motor 230 at time division by turning on the lower arm switching element of the inverter 420. It is possible to detect a phase current (idc).

The detected output current io may be applied to the inverter controller 430 as a discrete signal in the form of a pulse, and the inverter switching control signal Sic is generated based on the detected output current io. Can be.

On the other hand, the three-phase motor 230 is provided with a stator and a rotor, each phase AC power of a predetermined frequency is applied to the coil of the stator of each phase (a, b, c phase), the rotor rotates Will be

Such a motor 230 is, for example, a Surface-Mounted Permanent-Magnet Synchronous Motor (SMPMSM), an Interidcr Permanent Magnet Synchronous Motor (IPMSM), and a synchronous clock. Synchronous Reluctance Motor (Synrm) and the like. Of these, SMPMSM and IPMSM are permanent magnet synchronous motors (PMSMs) with permanent magnets, and synrms have no permanent magnets.

3 is an internal block diagram of the inverter controller of FIG. 2.

Referring to FIG. 3, the inverter controller 430 may include an axis converter 310, a speed calculator 320, a current command generator 330, a voltage command generator 340, an axis converter 350, and The switching control signal output unit 360 may be included.

The axis conversion unit 310 can convert the output currents (ia, ib, ic) detected by the output current detection unit (E) into two-phase currents (iα, iβ) of the stationary coordinate system.

On the other hand, the axis conversion unit 310 can convert the two-phase current (iα, iβ) of the stationary coordinate system into a two-phase current (id, iq) of the rotary coordinate system.

)를 추정하고, 추정된 위치를 미분하여, 속도(

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

), The derivative of 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 has a calculation speed (

) And the current command value i ^* _q based on the speed command value ω ^* _r . For example, the current command generation unit 330 has a calculation speed (

) Based on the difference between the speed command value ω ^* _r and the PI controller 335, the PI control may be performed, and the current command value i ^* _q may be generated. In the drawing, although the q-axis current command value i ^* _q is illustrated as a current command value, it is also possible to generate | generate a d-axis current command value i ^* _d unlike a 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 330 may further include a limiter (not shown) for restricting the level so that the current command value i ^* _q does not exceed the allowable range.

Next, the voltage command generation unit 340 includes the d-axis and q-axis currents i _d and i _q which are axis-converted in the two-phase rotational coordinate system by the axis conversion unit, and the current command value in the current command generation unit 330 ( Based on i ^* _d , i ^* _q ), the d-axis and q-axis voltage command values v ^* _d and v ^* _q are generated. For example, the voltage command generation unit 340 performs the 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 , and q The axial voltage setpoint v ^* _q can be generated. In addition, the voltage command generation unit 340 performs the 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 , and the d-axis voltage. The setpoint (v ^* _d ) can be generated. On the other hand, the voltage command generation unit 340 may further include a limiter (not shown) for restricting the level so that the d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) do not exceed the allowable range. .

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

)와, d축, q축 전압 지령치(v^* _d,v^* _q)를 입력받아, 축변환을 수행한다.The axis conversion unit 350 may be a position calculated by the speed calculating unit 320 (

), And the d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) are input, and axis conversion is performed.

)가 사용될 수 있다.First, the axis conversion unit 350 converts from a two-phase rotation coordinate system to a two-phase stop coordinate system. At this time, the position calculated by the speed calculating unit 320 (

) Can be used.

In addition, the axis conversion unit 350 performs a transformation from the two-phase stop coordinate system to the three-phase stop coordinate system. Through this conversion, the axis conversion unit 350 outputs the three-phase output voltage command value (v ^* a, v ^* b, v ^* c).

The switching control signal output unit 360 generates an inverter switching control signal Sic according to the pulse width modulation (PWM) method based on the three-phase output voltage command values (v ^* a, v ^* b, v ^* c). To print.

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

4A to 4B are views referred to for describing the operation of the conventional power converter.

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

The conventional power converter 220x includes wirings L and N for supplying an input AC power supply Vs, a fuse Fsx operating to cut the power supply, a filter unit 500x for reducing electromagnetic noise, and a converter. 410x, a dc terminal capacitor Cx, and an inverter 420x.

On the other hand, a wire core 522x for reducing electromagnetic noise is disposed between the wirings L and N and the converter 410x, particularly between the wirings L and N and the fuse Fsx, and the filter unit 500x is provided. Wire cores 523ax and 523bx are disposed between the ground terminals GND1 and GND2 to reduce noise. Then, a wire core 524x for grounding the input AC power supply Vs is disposed.

The wire cores 522x, 523ax, 523bx, and 524x of FIG. 4A may be implemented in a form in which a wire CND is wound around the core CR as shown in FIG. 4B.

On the other hand, as shown in Figure 4a, when using a plurality of wire core (522x, 523ax, 523bx, 524x), the electromagnetic noise reduction is partially reduced, but the manufacturing cost according to the wire core (522x, 523ax, 523bx, 524x) is increased there is a problem.

Accordingly, the present invention proposes a method for efficiently reducing electromagnetic noise while reducing manufacturing costs.

In particular, the present invention proposes a method of efficiently reducing electromagnetic noise while replacing the wire cores 523ax and 523bx connected to the ground terminal with other circuit elements to reduce the manufacturing cost. This will be described with reference to FIG. 5 or below.

FIG. 5 is a diagram illustrating a power converter according to an embodiment of the present invention, and FIGS. 6A to 8C are diagrams for describing an operating method of the power converter of FIG. 5.

First, referring to FIG. 5, the power converter 220a according to the embodiment of the present invention includes a filter unit 500 for filtering an input AC power supply Vs, an input terminal and a ground terminal () of the filter unit 500. The first impedance unit 540a disposed between the GND1 and the second impedance unit 540b disposed between the output terminal of the filter unit 500 and the ground terminal GND2 may be provided. Thereby, electromagnetic wave noise can be reduced efficiently.

On the other hand, the power conversion device 220a according to an embodiment of the present invention, the converter 410 for converting the AC power filtered by the filter unit 500 to the DC power, and the dc stage disposed at the output terminal of the converter 410 An inverter 420 including a capacitor C and a plurality of switching elements, and converting the DC power of the dc terminal capacitor C into an AC power by a switching operation.

Meanwhile, the first impedance unit 540a includes a first resistor element Ra and a first inductor La, and the second impedance unit 540b includes the second resistor element Rb and the second inductor ( Lb), and thus, it is possible to replace the wire core 522 disposed between the filter unit 500 and the ground end.

Here, the first resistance element Ra and the first inductor La may be connected in parallel, and the second resistance element Rb and the second inductor Lb may be connected in parallel.

In particular, the resistance values of the first resistor element Ra and the second resistor element Rb may correspond to a quality factor, and the impedances of the first inductor La and the second inductor Lb may be It may have an impedance corresponding to noise. As a result, the first impedance portion 540a and the second impedance portion 540b can reduce the manufacturing cost while efficiently reducing the electromagnetic noise.

Meanwhile, impedances of the first impedance unit 540a and the second impedance unit 540b may be the same.

Meanwhile, the power converter 220a according to the embodiment of the present invention may further include a wire core 522 disposed at the front end of the filter unit 500.

The wire core 522 may be disposed to reduce electromagnetic noise between the wirings L and N and the converter 410, particularly between the wirings L and N and the fuse Fs. The wire core 522 may be implemented in a form in which a wire CND is wound around the core CR as shown in FIG. 4B.

On the other hand, in the power converter 220a according to the embodiment of the present invention, a wire core 524 for grounding the input AC power source Vs may be disposed.

Meanwhile, the filter unit 500, the first impedance unit 540a, the second impedance unit 540b, the converter 410, the dc terminal capacitor C, and the inverter 420 are mounted on the same substrate PCB. Can be. This makes it possible to effectively reduce electromagnetic noise for circuit elements arranged on the same substrate.

On the other hand, the filter unit 500 is disposed at an input terminal and includes a first capacitor unit 510 including a plurality of capacitors Ca to Cc, and a plurality of capacitors Cd to Cf disposed at an output terminal. The second capacitor unit 520 and the ferrite FT may be disposed between the first capacitor unit 510 and the second capacitor unit 520. Accordingly, the input AC power supply Vs can be filtered.

In this case, the capacitances Ca to Cc of the capacitors in the first capacitor unit 510 may be larger than the capacitances of the capacitors Cd to Cf of the second capacitor unit 520. As a result, electromagnetic noise of AC power input to the filter unit 500 can be reduced over a wide band.

The first impedance unit 540a may be disposed between the first capacitor Ca and the second capacitor Cb and between the ground terminal GND1. In particular, the first resistance element Ra and the first inductor La may be connected in parallel with each other.

Accordingly, the electromagnetic noise generated at the input terminal of the filter unit 500 is reduced through the first impedance unit 540a and flows to the ground terminal GND1.

The second impedance unit 540b may be disposed between the fifth capacitor Ce and the sixth capacitor Cf and between the ground terminal GND2. In particular, the second resistance element Rb and the second inductor Lb may be connected in parallel with each other.

Accordingly, the electromagnetic noise generated at the output terminal of the filter unit 500 is reduced through the second impedance unit 540b and flows to the ground terminal GND2.

The first impedance part 540a and the second impedance part 540b allow the wire cores 5524ax and 523bx of FIG. 4A to be replaced, thereby effectively reducing electromagnetic noise while reducing manufacturing costs. It becomes possible to reduce.

6A and 6B are views referred to for describing the performance of the first impedance unit 540a and the second impedance unit 540b.

First, FIG. 6A is a diagram illustrating impedance versus frequency.

In FIG. 6A, f1a represents an impedance curve with respect to frequency when the wire cores 5524ax and 523bx of FIG. 4A are provided. In FIG. 6A, f2a represents the first impedance unit 540a and the second impedance unit 540b of FIG. 5. ) Shows a frequency versus impedance curve when the inductors la and Lb are omitted, and f3a of FIG. 6A shows inductors la and Lb in the first impedance unit 540a and the second impedance unit 540b of FIG. 5. ) And a frequency vs. impedance curve when the resistors Ra and Rb are provided.

Analyzing each of the curves f1a, f2a, and f3a, the impedances of f1a and f2a increase as the frequency increases, but the impedance of f3a becomes constant even when the frequency increases.

Therefore, as shown in FIG. 5, in the case where both the inductors la and Lb and the resistance elements Ra and Rb are provided in the second impedance unit 540b, the electromagnetic waves are evenly distributed over the entire band due to the constant impedance to frequency. There is an advantage that can reduce noise.

Next, FIG. 6B is a diagram illustrating a quality factor versus frequency.

In FIG. 6B, f1b shows a frequency-to-frequency quality factor curve when the wire cores 5524ax and 523bx of FIG. 4A are provided, and f2b in FIG. 6B represents a first impedance unit 540a and a second impedance unit (FIG. In FIG. 6B, the frequency factor curves of the inductors la and Lb are omitted, and f3b of FIG. 6B represents inductors la of the first impedance unit 540a and the second impedance unit 540b of FIG. 5. , Lb, and a frequency-to-frequency factor curve when the resistors Ra and Rb are provided.

Analyzing each curve (f1b, f2b, f3b), f1b increases the quality factor as the frequency increases, but decreases the quality factor from fm frequency and then increases, but f2b and f3b increase the quality factor even when the frequency increases. Gradually becomes smaller.

As a result, resonance deterioration may occur in Arb near the fb frequency of f1b, and the electromagnetic noise may be severe. In Ara near the frequencies of f2b and f3b, the resonance may be improved to reduce the electromagnetic noise.

Therefore, as shown in FIG. 5, when both the inductors la and Lb and the resistance elements Ra and Rb are provided in the second impedance unit 540b, the frequency factor decreases with respect to the frequency, thereby evenly spreading over the entire band. Therefore, there is an advantage that can reduce electromagnetic noise.

Meanwhile, FIG. 7 illustrates a case in which the power converter 220m according to the present invention is omitted, in which the first impedance unit 540a and the second impedance unit 540b are omitted in comparison with FIG. 5.

Next, FIG. 8A illustrates a voltage level Cu and a current level Cub versus frequency when the wire cores 5524ax and 523bx of FIG. 4A are provided, and FIG. 8B illustrates the first impedance unit 540a of FIG. In the second impedance unit 540b, the voltage level Cuc and the current level Cud versus frequency when the inductors la and Lb and the resistance elements Ra and Rb are provided are illustrated in FIG. 8C. As shown in FIG. 7, the voltage impedance level Cue and the current level Cuf of the frequency when the first impedance unit 540a and the second impedance unit 540b are omitted are shown.

8A and 8B show that the voltage level and the current level are stable with respect to the frequency, but FIG. 8C shows that the voltage level and the current level increase as the frequency increases, especially in the arm region. .

When the first impedance part 540a and the second impedance part 540b of FIG. 5 exist, the performance corresponding to the wire cores 523ax and 523bx of FIG. 4A is shown, but the first impedance part 540a is shown. In the absence of the second impedance portion 540b, the electromagnetic noise appears to be quite significant.

As a result, electromagnetic wave noise can be considerably reduced due to the first impedance part 540a and the second impedance part 540b of FIG. 5, and furthermore, the manufacturing cost can be reduced.

On the other hand, the power converter 220 and the home appliance 100 having the same according to another embodiment of the present invention, the filter unit 500 for filtering the input AC power (Vs), and the input terminal of the filter unit 500 And a first impedance unit 540a disposed between the ground terminal GND1 and a second impedance unit 540b disposed between the output terminal of the filter unit 500 and the ground terminal GND2. The unit 540a and the second impedance unit 540b each include a resistance element and an inductor, and the filter unit 500, the first impedance unit 540a, and the second impedance unit 540b are formed of the same substrate ( PCB). Thereby, electromagnetic wave noise can be reduced efficiently.

Meanwhile, the above-described power converter 220 or 220a may be applied to various electronic devices. For example, the present invention may be applied to a laundry treatment device, an air conditioner, a refrigerator, a water purifier, a cleaner, a vehicle, a robot, a drone, and the like among home appliances. Hereinafter, various examples of applicable home appliances of the power converter 220 are illustrated.

9 is a diagram illustrating a configuration of an air conditioner as an example of a home appliance according to an exemplary embodiment of the present invention.

As shown in FIG. 9, the air conditioner 100 according to the present invention may include an indoor unit 31 and an outdoor unit 21 connected to the indoor unit 31.

The indoor unit 31 of the air conditioner may be any of a stand type air conditioner, a wall-mounted air conditioner, and a ceiling type air conditioner, but the drawing illustrates the stand type indoor unit 31.

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

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

The outdoor unit 21 supplies a refrigerant to the indoor unit 31 by compressing or heat-exchanging the refrigerant according to a setting by operating a compressor and an outdoor heat exchanger. The outdoor unit 21 may be driven by the demand of the remote controller (not shown) or the indoor unit 31. In this case, as the cooling / heating capacity is changed corresponding to the indoor unit being driven, the number of operation of the outdoor unit and the number of operation of the compressor installed in the outdoor unit may be changed.

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

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

At this time, the outdoor unit 21 and the indoor unit 31 are connected by a communication line to transmit and receive data, and the outdoor unit and the indoor unit are connected to a remote controller (not shown) by wire or wirelessly and operate under the control of a remote controller (not shown). can do.

The remote controller (not shown) may be connected to the indoor unit 31 to input a control command of the user to the indoor unit, and receive and display state information of the indoor unit. At this time, the remote control may communicate by wire or wirelessly according to the connection form with the indoor unit.

10 is a schematic diagram of the outdoor unit and the indoor unit of FIG. 9.

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

The outdoor unit 21 includes a compressor 102 that serves to compress the refrigerant, a compressor electric motor 102b that drives the compressor, an outdoor side heat exchanger 104 that serves to radiate the compressed refrigerant, and an outdoor unit. An outdoor blower 105 disposed at one side of the heat exchanger 104 and configured to expand the condensed refrigerant by an outdoor blower 105 including an outdoor fan 105a for promoting heat dissipation of the refrigerant and an electric motor 105b for rotating the outdoor fan 105a. A mechanism 106, a cooling / heating switching valve 110 for changing a flow path of a compressed refrigerant, and an accumulator 103 for temporarily storing a gasified refrigerant to remove moisture and foreign matter and then supplying a refrigerant having a constant pressure to the compressor. And the like.

The indoor unit 31 is an indoor heat exchanger 109 disposed indoors to perform a cooling / heating function, and an indoor fan 109a disposed at one side of the indoor heat exchanger 109 to promote heat dissipation of the refrigerant, and an indoor unit. And an indoor blower 109 composed of an electric motor 109b for rotating the fan 109a.

At least one indoor side heat exchanger 109 may be installed. The compressor 102 may be at least one of an inverter compressor and a constant speed compressor.

In addition, the air conditioner 100 may be configured as a cooler for cooling the room, or may be configured as a heat pump for cooling or heating the room.

The compressor 102 in the outdoor unit 21 of FIG. 9 may be driven by a power converter, such as FIG. 1, which drives the compressor motor 250.

Alternatively, the indoor fan 109a or the outdoor fan 105a may be driven by the power converter 220, as shown in FIG. 1, which drives the indoor fan motor 109b and the outdoor fan motor 150b, respectively. .

11 is a perspective view showing a laundry treatment machine according to an embodiment of the present invention.

Referring to the drawings, the laundry treatment machine 100b according to an embodiment of the present invention is a laundry machine of a front load type in which a bag is inserted into a washing tank in a front direction. The laundry treatment apparatus of the front type is a concept including a washing machine in which a cloth is inserted to perform washing, rinsing and dehydration, or a dryer in which a wet cloth is inserted to perform drying. Hereinafter, a washing machine will be described.

The laundry treatment apparatus 100b of FIG. 11 is a laundry tub laundry treatment apparatus. The laundry treatment apparatus 100b is disposed inside the cabinet 110b and supported by the cabinet 110b. The tub 120b, the washing tub 122b disposed inside the tub 120b, the cloth is washed, the motor 130b for driving the washing tub 122b, and the cabinet 110b outside the cabinet body 111b. It includes a washing water supply device (not shown) for supplying the wash water therein, and a drainage device (not shown) formed under the tub 120b to discharge the wash water to the outside.

A plurality of through holes 122Ab are formed in the washing tub 122b to allow the washing water to pass therethrough, and when the laundry is rotated, the laundry is lifted to a certain height, and then lifted on the inner side of the washing tub 112b so as to fall by gravity. 124b may be disposed.

The cabinet 110b includes a cabinet main body 111b, a cabinet cover 112b disposed on the front surface of the cabinet main body 111b and coupled thereto, and a control disposed above the cabinet cover 112b and coupled with the cabinet main body 111b. A panel 115b and a top plate 116b disposed above the control panel 115b and coupled to the cabinet body 111b are included.

The cabinet cover 112b includes a fabric access hole 114b formed to allow the fabric to enter and exit, and a door 113b disposed to be rotatable from side to side to allow the fabric access hole 114b to be opened and closed.

The control panel 115b includes operation keys 117b for manipulating the driving state of the laundry processing apparatus 100b and a display device disposed at one side of the manipulation keys 117b and displaying the driving state of the laundry processing apparatus 100b. 118b).

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

On the other hand, the washing tank 122b may be provided with an auto balance (not shown). Auto balance (not shown) is to reduce the vibration caused by the eccentric amount of the laundry contained in the washing tank 122b, it may be implemented as a liquid balance, ball balance and the like.

On the other hand, although not shown in the figure, the laundry treatment apparatus 100b may further include a vibration sensor for measuring the vibration amount of the washing tank 122b or the vibration amount of the cabinet 110b.

12 is an internal block diagram of the laundry treatment machine of FIG.

Referring to the drawings, in the laundry treatment apparatus 100b, the driving unit 220b is controlled by the control operation of the control unit 210b, and the driving unit 220b drives the motor 230b. Accordingly, the washing tank 122b is rotated by the motor 230b.

The control unit 210b receives an operation signal from the operation key 1017b and operates. Accordingly, washing, rinsing, and dehydration strokes can be performed.

In addition, the controller 210b may control the display 18b to display a washing course, a washing time, a dehydration time, a rinsing time, or a current operation state.

On the other hand, the control part 210b controls the drive part 220b, and the drive part 220b controls to operate the motor 230b. At this time, inside or outside the motor 230b, a position sensing unit for sensing the rotor position of the motor is not provided. That is, the driving unit 220b controls the motor 230b by a sensorless method.

The driver 220b is for driving the motor 230b, and an output current detector (E in FIG. 2) for detecting an output current flowing through an inverter (not shown), an inverter controller (not shown), and the motor 230b. And an output voltage detector (b of FIG. 2) for detecting the output voltage vo applied to the motor 230b. In addition, the driving unit 220b may have a concept of further including a converter, which supplies a DC power input to an inverter (not shown).

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

Specifically, the inverter controller 430b of FIG. 2 generates a switching control signal (Sic of FIG. 2) of the pulse width modulation PWM pattern based on the output current idc and the output voltage vo, thereby inverting the inverter. When output to (not shown), the inverter (not shown) performs a high speed switching operation, and supplies AC power of a predetermined frequency to the motor 230b. The motor 230b is then rotated by an AC power supply of a predetermined frequency.

The driver 220b may correspond to the power converter 220 of FIG. 1.

On the other hand, the controller 210b may detect the amount of dose based on the output current idc flowing through the motor 230b. For example, while the washing tub 122b is rotating, the amount of quantity can be sensed based on the current value idcb of the motor 230b.

In particular, the control unit 210b, when detecting the amount of capacity, by using the stator resistance and inductance value of the motor measured in the motor alignment section, it is possible to accurately detect the amount.

On the other hand, the control unit 210b may detect an eccentric amount of the washing tub 122b, that is, an unbalance (UB) of the washing tub 122b. Such eccentricity detection may be performed based on the ripple component of the output current idc flowing in the motor 230b or the rotation speed change amount of the washing tub 122b.

In particular, the controller 210b can accurately detect the amount of eccentricity by using the stator resistance and the inductance value of the motor measured in the motor alignment section during the detection of the dose.

13 is a perspective view illustrating a refrigerator that is another example of a home appliance according to an exemplary embodiment of the present invention.

Referring to the drawings, the refrigerator 100c according to the present invention, although not shown, has a case 110c having an inner space partitioned into a freezer compartment and a refrigerator compartment, a freezer compartment door 120c that shields the freezer compartment, and a refrigerator compartment. A rough appearance is formed by the refrigerating compartment door 140c.

In addition, the front surface of the freezing compartment door 120c and the refrigerating compartment door 140c is further provided with a door handle 121c protruding forward, so that the user easily grips and rotates the freezing compartment door 120c and the refrigerating compartment door 140c. Make it work.

On the other hand, the front of the refrigerator compartment door 140c may be further provided with a home bar 180c, which is a convenient means for allowing a user to take out a storage such as a beverage contained therein without opening the refrigerator compartment door 140c.

In addition, the front of the freezer compartment door 120c may be provided with a dispenser 160c, which is a convenience means for allowing the user to easily take out ice or drinking water without opening the freezer compartment door 120c, such a dispenser 160c. An upper side of the control panel 210c may be further provided to control the driving operation of the refrigerator 100c and to show a state of the refrigerator 100c being operated on the screen.

Meanwhile, although the dispenser 160c is illustrated as being disposed on the front surface of the freezer compartment door 120c, the present invention is not limited thereto, and the dispenser 160c may be disposed on the front side of the refrigerator compartment door 140c.

On the other hand, the inner upper portion of the freezer compartment (not shown) is an ice maker 190c for making water supplied using cold air in the freezer compartment, and an ice bank mounted inside the freezer compartment (not shown) so that the ice iced from the ice maker is iced and contained therein. 195c may be further provided. In addition, although not shown in the drawing, an ice chute (not shown) may be further provided to guide the ice contained in the ice bank 195c to fall into 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 temperature inside the refrigerator. For example, the display unit 230c may display a service type (eg, ice, water, or flake ice) of the dispenser, a set temperature of the freezer compartment, and a set temperature of the refrigerator compartment.

The display unit 230c may be implemented in various ways, such as a liquid crystal display (LCD), a light emitting diode (LED), and an organic light emitting diode (OLED). In addition, 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 may include a dispenser setting button (not shown) for setting a service type of the dispenser (ice cube, water, ice cubes, etc.) and a freezer compartment temperature setting button (not shown) for setting a freezer temperature. And, it may include 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 that can also perform the 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 drawings, but is a one door type, a sliding door type, a curtain door type. (Curtain Door Type) and other forms.

FIG. 14 is a view schematically illustrating the configuration of the refrigerator of FIG. 13.

Referring to the drawings, the refrigerator 100c is provided with a compressor 112c, a condenser 116c for condensing the refrigerant compressed by the compressor 112c, and a refrigerant condensed by the condenser 116c, and evaporated. 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 may be included.

On the other hand, in the drawing, but illustrated as using one evaporator, it is also possible to use each evaporator in the refrigerating chamber and freezing chamber.

That is, the refrigerator 100c is a three-way valve for supplying a refrigerator evaporator (not shown) arranged in the refrigerator compartment (not shown) and a refrigerant condensed in the condenser 116c to the refrigerator compartment evaporator (not shown) or the freezer compartment evaporator 124c. (Not shown) and a refrigerator compartment expansion valve (not shown) for expanding the refrigerant supplied to the refrigerator compartment evaporator (not shown).

In addition, the refrigerator 100c may further include a gas-liquid separator (not shown) in which the refrigerant passing through the evaporator 124c is separated into a liquid and a gas.

In addition, the refrigerator 100c further includes a refrigerator compartment fan (not shown) and a freezer compartment 144c that suck cold air that has passed through the freezer compartment evaporator 124c and blow it into a refrigerator compartment (not shown) and a freezer compartment (not shown), respectively. can do.

In addition, the compressor driving unit 113c for driving the compressor 112c, a refrigerator compartment fan (not shown) and a refrigerator compartment fan driver (not shown) and a freezer compartment driver 145c for driving the freezer compartment 144c may be further included. have.

Meanwhile, according to the drawing, since a common evaporator 124c is used in the refrigerating compartment and the freezing compartment, in this case, a damper (not shown) may be installed between the refrigerating compartment and the freezing compartment, and the fan (not shown) is one evaporator. The cold air generated in the air may be forced to be supplied to the freezing compartment and the refrigerating compartment.

The compressor 112c of FIG. 14 may be driven by a power converter, such as FIG. 1, which drives the compressor motor.

Alternatively, the refrigerating compartment fan (not shown) or the freezer compartment fan 144c may be driven by a power converter, such as FIG. 1, respectively driving a refrigerating compartment fan motor (not shown) and a freezer compartment fan motor (not shown). .

The power conversion apparatus and the home appliance having the same according to the embodiment of the present invention are not limited to the configuration and method of the embodiments described as described above, but the embodiments may be modified in various ways. All or some of the embodiments may be optionally combined.

On the other hand, the motor driving method or the operation method of the home appliance of the present invention, it is possible to implement as a processor-readable code on a processor-readable recording medium provided in the power converter or the home appliance. The processor-readable recording medium includes all kinds of recording devices that store data that can be read by the processor.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

Claims (11)

Filter unit for filtering the input AC power;
A first impedance unit disposed between an input terminal of the filter unit and a ground terminal;
A second impedance part disposed between the output end of the filter part and a ground end;
A converter for converting the AC power filtered by the filter into DC power;
A dc terminal capacitor disposed at the output terminal of the converter;
And a plurality of switching elements, the inverter converting the DC power of the dc terminal capacitor into an AC power by a switching operation. The method of claim 1,
The first impedance unit,
A first resistor element and a first inductor,
The second impedance unit,
And a second resistor element and a second inductor. The method of claim 2,
The first resistor element and the first inductor are connected in parallel,
And the second resistor element and the second inductor are connected in parallel. The method of claim 2,
And a resistance value of the first resistor element and the second resistor element corresponds to a quality factor. The method of claim 2,
And the impedance of the first inductor and the second inductor has an impedance corresponding to noise. The method of claim 1,
And the impedance of the first impedance unit and the second impedance unit is the same. The method of claim 1,
And a wire core disposed at a front end of the filter unit. The method of claim 1,
And the filter unit, the first impedance unit, the second impedance unit, the converter, the dc terminal capacitor, and the inverter are mounted on the same substrate. The method of claim 1,
The filter unit,
A first capacitor unit disposed at the input terminal and having a plurality of capacitors;
A second capacitor unit disposed at the output terminal and having a plurality of capacitors;
And a ferrite disposed between the first capacitor portion and the second capacitor portion. Filter unit for filtering the input AC power;
A first impedance unit disposed between an input terminal of the filter unit and a ground terminal;
A second impedance part disposed between the output end of the filter part and a ground end;
A converter for converting the AC power filtered by the filter into DC power;
A dc terminal capacitor disposed at the output terminal of the converter;
An inverter having a plurality of switching elements, and converting a DC power of the dc terminal capacitor into an AC power by a switching operation;
The first impedance portion and the second impedance portion,
Each has a resistive element and an inductor,
And the filter unit, the first impedance unit, the second impedance unit, the converter, the dc terminal capacitor, and the inverter are mounted on the same substrate. A home appliance comprising the power converter of any one of claims 1 to 10.

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