KR101756410B1 - Motor driving apparatus and home appliance including the same - Google Patents

Abstract

The present invention relates to a motor driving apparatus and a home appliance having the motor driving apparatus. A motor driving apparatus according to an embodiment of the present invention includes a converter for converting input AC power to DC power and outputting the DC power to the dc stage, a dc-stage capacitor connected to both ends of the dc stage, An inverter for converting a DC power source of the dc stage into an AC power source and outputting the converted AC power source to the motor by a switching operation; a first switching element, which is disposed between the dc- And a second switching element, and a control unit for controlling the operation of the inverter and the filter unit. As a result, the electromagnetic noise can be reduced.

Description

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

The present invention relates to a motor driving apparatus and a home appliance having the motor driving apparatus, and more particularly, to a motor driving apparatus capable of reducing electromagnetic noise and a home appliance having the same.

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

On the other hand, the motor drive apparatus can be classified into a sensor-driven motor drive apparatus using sensors and a sensorless motor drive apparatus without sensor.

2. Description of the Related Art In recent years, sensorless motor drive devices have been widely used due to a reduction in manufacturing cost and the like. Accordingly, a sensorless motor drive device has been studied for efficient motor drive.

On the other hand, various efforts have been made to reduce electromagnetic noise (EMI noise) in a motor driving apparatus in accordance with regulations of respective countries.

An object of the present invention is to provide a motor driving apparatus capable of reducing electromagnetic noise and a home appliance having the same.

It is another object of the present invention to provide a motor drive apparatus capable of actively reducing electromagnetic noise without a separate noise detection circuit and a home appliance having the motor drive apparatus.

According to an aspect of the present invention, there is provided a motor drive apparatus including a converter for converting an input AC power to a DC power and outputting the DC power to a dc stage, a dc-stage capacitor connected to both ends of the dc stage, An inverter for converting a DC power source of the dc stage to an AC power source and outputting the converted AC power source to the motor by a switching operation; and an inverter disposed between the dc- A filter unit having a first switching element and a second switching element to be connected, and a control unit for controlling operations of the inverter and the filter unit.

According to another aspect of the present invention, there is provided a home appliance including a converter for converting input AC power to DC power and outputting the DC power to a dc stage, a dc-stage capacitor connected to both ends of the dc stage, An inverter which has a switching element and a lower arm switching element and converts the DC power of the dc stage into an AC power by the switching operation and outputs the converted AC power to the motor; A filter unit having a first switching element and a second switching element connected in series, and a control unit for controlling operations of the inverter and the filter unit.

According to an embodiment of the present invention, a motor driving apparatus and a home appliance having the motor driving apparatus include a converter for converting an input AC power into a DC power and outputting the DC power to the dc stage, a dc-stage capacitor connected to both ends of the dc stage, An inverter for converting a DC power source of the dc stage into an AC power source and outputting the converted AC power source to the motor by a switching operation, and a dc capacitor disposed between the dc capacitor and the inverter, The filter section including the first switching element and the second switching element which are connected in series to each other and the control section for controlling the operation of the inverter and the filter section can reduce the electromagnetic noise.

Particularly, the control unit generates and outputs a filter switching control signal for canceling the noise component generated in switching the inverter by the inverter switching control signal, so that the electromagnetic noise is actively reduced without a separate noise detection circuit .

On the other hand, when the filter unit further includes the third switching device and the fourth switching device, the first switching device or the second switching device is turned on, or the third switching device or the fourth switching device is turned on, Not only low-frequency noise but also high-frequency noise can be reduced.

1 illustrates an example of an internal block diagram of a motor driving apparatus according to an embodiment of the present invention.
2 is an example of an internal circuit diagram of the motor driving apparatus of FIG.
3 is an internal block diagram of the inverter control unit of FIG.
4 is an example of a circuit diagram of a motor driving apparatus.
5 is an example of a circuit diagram of a motor driving apparatus according to an embodiment of the present invention.
6 is another example of a circuit diagram of a motor driving apparatus according to an embodiment of the present invention.
7 is another example of a circuit diagram of a motor driving apparatus according to an embodiment of the present invention.
8 is another example of a circuit diagram of a motor driving apparatus according to an embodiment of the present invention.
9 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.
10 is an internal block diagram of the laundry processing apparatus of FIG.
11 is a diagram illustrating a configuration of an air conditioner that is another example of a home appliance according to an embodiment of the present invention.
12 is a schematic view of the outdoor unit and the indoor unit of Fig.
13 is a perspective view illustrating a refrigerator that is another example of a home appliance according to an embodiment of the present invention.
14 is a view schematically showing the configuration of the refrigerator of Fig.

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.

The motor driving apparatus described in this specification can estimate the rotor position of the motor by a sensorless method in which a position sensing unit such as a hall sensor for sensing the rotor position of the motor is not provided Which is a motor-driven device. Hereinafter, a sensorless motor drive apparatus will be described.

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

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

The motor driving apparatus 220 according to the embodiment of the present invention drives a motor in a sensorless manner and includes a filter unit 610, an inverter 420, an inverter control unit 430).

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

Meanwhile, a motor driving apparatus 220 according to an embodiment of the present invention includes a converter 410 for converting input AC power to DC power and outputting the DC power to the dc stage, a dc-stage capacitor connected to both ends of the dc stage, An inverter 420 for converting the direct current power of the dc stage to the alternating current power and outputting the converted alternating current power to the motor by a switching operation, and a dc short capacitor and an inverter A filter unit 610 having a first switching element Sf1 and a second switching element Sf2 that are connected in series to each other and a second switching element Sf2 disposed between the inverter 420 and the filter unit 610, The inverter control unit 430 may be provided. In this way, the electromagnetic noise generated by the switching operation of the inverter 420 can be reduced.

In particular, the inverter control unit 430 generates and outputs the filter switching control signal Sfc for canceling the noise component generated in the inverter switching by the inverter switching control signal Sic, thereby outputting the filter switching control signal Sfc without any additional noise detection circuit, So that the electromagnetic noise can be actively reduced.

Particularly, when a small-capacity dc single capacitor C, which is called capacitorless, is used, the voltage across the dc short capacitor C is pulsated. In the motor driving apparatus according to the embodiment of the present invention The inverter control unit 430 in the inverter control unit 220 generates and outputs the filter switching control signal Sfc for canceling the noise component generated in switching the inverter by the inverter switching control signal Sic, , The electromagnetic noise can be actively reduced.

Hereinafter, the operation of each of the constituent units in the motor driving 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 that has passed through the reactor L into DC power, and outputs the DC power to the dc stage. 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 is connected across dc, smoothing the input power supply and storing 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. [ Thus, three-phase AC power having a predetermined frequency is output to the three-phase synchronous motor 230.

The inverter control unit 430 can control the switching operation of the inverter 420 based on the sensorless method. To this end, the inverter control unit 430 may receive the output current idc detected by the output current detection unit E.

The inverter control unit 430 outputs the inverter switching control signal Sic to the inverter 420 to control the switching operation of the inverter 420. [ The inverter switching control signal Sic is generated and outputted based on the output current idc detected by the output current detection section E as a switching control signal of the pulse width modulation method (PWM). Detailed operation of the output of the inverter switching control signal Sic in the inverter control unit 430 will be described later with reference to Fig.

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

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

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

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

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

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

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

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

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.

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.

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.

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 ).

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.

On the other hand, the switching control signal output unit 560 can output the filter switching control signal Sfc to the filter unit 610 in accordance with the inverter switching control signal Sic to be outputted.

Particularly, the switching control signal output unit 560 can generate and output a filter switching control signal Sfc for canceling the noise component generated when the inverter 420 is switched by the inverter switching control signal Sic . Thereby, the electromagnetic noise generated by the switching operation of the inverter 420 can be actively reduced without a separate noise detection circuit.

4 is an example of a circuit diagram of a motor driving apparatus.

4 includes an active filter unit 490 and a passive filter unit 620 for reducing electromagnetic noise (EMI) generated by switching of the inverter 420. The active filter unit 490, the passive filter unit 620, As shown in Fig.

The active filter unit 490 shown in Fig. 4 includes a current detecting unit CT for detecting a current flowing in a dc stage, and a switching device (not shown) for performing a switching operation based on the detected current, Sfa, Sfb).

According to this configuration, the current detector CT must include the inductors Lca and Lcb, and the switching elements Sfa and Sfb are turned on or off by the detected noise. However, according to such a configuration, only noise in a limited frequency band (mainly low frequency band) is reduced.

Further, since the current detecting portion CT is required, space and cost are constrained.

In the present invention, a method for easily reducing the electromagnetic noise is presented. We also discuss ways to reduce broadband electromagnetic noise. This will be described with reference to Figs. 5 to 8. Fig.

5 is an example of a circuit diagram of a motor driving apparatus according to an embodiment of the present invention.

5, the motor driving apparatus 400a includes a converter 410 for converting input AC power to DC power and outputting the DC power to the dc stage, a dc-stage capacitor C connected to both ends of the dc stage, An inverter 420 having a plurality of sag-lock switching elements and a lower arm switching element, for converting a DC power source of the dc stage into an AC power source by a switching operation and outputting the converted AC power source to the motor, a dc- A filter unit 610 including a first switching device Sf1 and a second switching device Sf2 that are connected in series with each other and an operation of the inverter 420 and the filter unit 610, And an inverter control unit 430 for controlling the inverter.

5 may further include a second filter unit 620 disposed between the input AC power source and the converter 410 and made of a passive element.

The second filter unit 620 may include the two inductor elements La and Lb and the capacitor elements Ca and Cb connected in series between the inductor elements La and L. [

The second filter unit 620, which is a passive filter unit, can be used to reduce the noise signal in the frequency band not reduced by the filter unit 610 which is the active filter unit.

The filter unit 610 includes a first switching element Sf1 whose one end is connected to a node a which is one end of the dc stage ab and a second switching element Sf2 connected to the other terminal of the first switching element Sf1 ).

The first switching element Sf1 and the second switching element Sf2 may be a phsh-pull switching element or a phsh-pull amplifier.

The filter unit 610 includes a first impedance element Cf1 connected between the first node nf1 between the first switching element Sf1 and the second switching element Sf2 and the ground terminal GND, As shown in FIG.

On the other hand, the inverter control unit 430 outputs the inverter switching control signal Sic to the inverter 420 and outputs the filter switching control signal Sfc to the filter unit 610 in response to the inverter switching control signal Sic Can be output.

Specifically, the inverter control unit 430 can generate and output a filter switching control signal Sfc for canceling the noise component generated when the inverter 420 is switched by the inverter switching control signal Sic.

That is, the inverter control unit 430 generates and outputs the inverter switching control signal Sic for switching operation of the inverter 420, so that the electromagnetic noise signal that can be generated at the dc stage is predicted by the switching of the inverter 420 .

Accordingly, the inverter control unit 430 controls the switching operation of the first switching element Sf1 and the second switching element Sf2, which are active elements in the filter unit 610, in order to reduce the electromagnetic noise signal to be generated and predicted , The filter switching control signal Sfc can be generated and output.

For example, the inverter control unit 430 turns on the first switching device Sf1 and turns off the second switching device Sf2 so that the electromagnetic noise generated at the dc stage becomes the first impedance element Cf1 To the ground terminal (GND). According to this, since the electromagnetic noise generated at the dc stage flows to the ground terminal (GND), it does not affect the converter 410 and the input AC power source. Therefore, electromagnetic noise in the motor driving apparatus 220 can be effectively reduced.

The inverter control unit 430 turns on the first switching device Sf1 and turns on the second switching device Sf2 so that the electromagnetic noise generated at the dc stage becomes the first switching device Sf1, , The second switching element (Sf2), and the dc short-circuit capacitor (C).

On the other hand, the converter 410 may be constituted by a rectifying part without a switching element.

6 is another example of a circuit diagram of a motor driving apparatus according to an embodiment of the present invention.

The motor driving apparatus 220b of FIG. 6 is similar to the motor driving apparatus 200a of FIG. 5 except that the second filter section 620 of FIG. 5 is omitted.

5, since the electromagnetic noise generated in the dc stage does not affect the converter 410 and the input AC power source by the operation of the filter unit 610, The second filter unit 620 may be omitted.

Thus, according to the motor driving apparatus 220b of Fig. 6, the manufacturing cost and the like are reduced as compared with Fig. 4, etc., and the motor driving apparatus can be downsized.

7 is another example of a circuit diagram of a motor driving apparatus according to an embodiment of the present invention.

7, the motor driving apparatus 220c of FIG. 7 is similar to the motor driving apparatus 200a of FIG. 5 except that the first switching element Sf1 and the second switching element Sf2 The third switching element Sf3, the fourth switching element Sf4 and the second impedance element Cf2 in addition to the first impedance element Cf1 and the first impedance element Cf1.

At this time, it is preferable that the impedances of the first impedance element Cf1 and the second impedance element Cf2 are different from each other.

The filter unit 710 includes a first switching device Sf1 whose one end is connected to a node a which is one end of the dc stage ab and a second switching device Sf2 connected to the other terminal of the first switching device Sf1 ).

The filter unit 710 includes a first node nf1 between the first switching element Sf1 and the second switching element Sf2 and a first impedance element Cf1 connected between the ground node GND, As shown in FIG.

The filter unit 710 includes a third switching device Sf3 whose one end is connected to a node a of the dc stage ab and a fourth switching device Sf2 connected to the other terminal of the third switching device Sf3, (Sf4).

On the other hand, the third switching element Sf3 and the fourth switching element Sf4 may be a phsh-pull switching element or a phsh-pull amplifier.

The filter unit 710 includes a second node nf2 between the third switching element Sf3 and the fourth switching element Sf4 and a second impedance element Cf2 connected between the ground terminal GND, As shown in FIG.

That is, the third switching element Sf3 and the fourth switching element Sf4 can be connected in parallel to the first switching element Sf1 and the second switching element Sf2.

The inverter control unit 430 controls the first switching device Sf1 or the second switching device Sf2 to be turned on or the third switching device Sf3 or the fourth switching device Sf2 according to the noise signal at the dc stage Sf4) are turned on.

For example, when the impedance of the first impedance element Cf1 is larger than the impedance of the second impedance element Cf2, the first switching element Sf1, the second switching element Sf2, the first impedance element Cf1 ) Is used for reducing the low frequency band of the electromagnetic noise, and the third switching element Sf3, the fourth switching element Sf4, and the second impedance element Cf2 are used for reducing the high frequency band of electromagnetic noise .

That is, the inverter control unit 430 turns on the first switching device Sf1 when the electromagnetic noise generated by the operation of the inverter 420 is in the low frequency band, and turns on the second switching device Sf2, The element Sf3, and the fourth switching element Sf4 can be turned off. As a result, the electromagnetic noise in the low frequency band flows to the ground terminal (GND) through the first impedance element Cf1.

On the other hand, when the electromagnetic noise generated by the operation of the inverter 420 is the high frequency band, the inverter control unit 430 turns on the third switching device Sf3 and turns on the first switching device Sf1, The element Sf2, and the fourth switching element Sf4 can be turned off. As a result, the electromagnetic noise in the high frequency band flows through the second impedance element Cf2 to the ground terminal GND.

As described above, according to the motor driving apparatus 220c of Fig. 7, it is possible to reduce broadband electromagnetic noise.

On the other hand, the bandwidths of the first switching device Sf1 and the second switching device Sf2 may be different from the bandwidths of the third switching device Sf3 and the fourth switching device Sf4.

For example, when the bandwidths of the first switching element Sf1 and the second switching element Sf2 are low, the first switching element Sf1, the second switching element Sf2, and the first impedance element Cf1 are electrically connected to the electromagnetic wave The third switching element Sf3 and the fourth switching element Sf4 are used when the bandwidth of the third switching element Sf3 and the fourth switching element Sf4 is higher than that of the third switching element Sf3, It is preferable that the 2-impedance element Cf2 is used when reducing the high-frequency band of the electromagnetic noise.

8 is another example of a circuit diagram of a motor driving apparatus according to an embodiment of the present invention.

7, the motor driving apparatus 220d of FIG. 8 includes a filter unit 810 including a first switching element Sf1, a second switching element Sf2, a first impedance element Cf1) a third switching element Sf3, a fourth switching element Sf4 and a second impedance element Cf2 and further includes a current detecting part CT for detecting a current flowing in the c- There is a difference.

As described above, according to the motor driving device 220d of Fig. 8, it is possible to reduce broadband electromagnetic noise.

On the other hand, the filter unit 810 includes a current detection unit CT. The current detected by the current detection unit CT is distributed through the resistance element Ra, and the first switching element Sf1 and the second And may be applied to the respective gate terminals of the switching element Sf2. Accordingly, the first switching device Sf1 and the second switching device Sf2 perform the switching operation.

On the other hand, the current detected by the current detection part CT can be distributed via the resistance element Rb and applied to the gate terminals of the third switching element Sf3 and the fourth switching element Sf4. Accordingly, the third switching element Sf3 and the fourth switching element Sf4 perform the switching operation.

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

9 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 cloth is inserted to perform drying, and the following description will be focused on a washing machine.

The laundry processing apparatus 100a of FIG. 9 is a laundry laundry processing apparatus, which is a laundry laundry processing apparatus comprising a cabinet 110 for forming an outer appearance of the laundry processing apparatus 100a, a cabinet 110 disposed inside the cabinet 110, A motor 130 for driving the washing tub 122 and a cabinet 110 disposed outside the cabinet main body 111. The washing tub 122 is disposed inside the cabinet 110, (Not shown) for supplying washing water to the inside of the tub 120 and a drain (not shown) for discharging washing water to the outside.

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

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

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

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

The operation keys 117 and the display device 118 in the control panel 115 are electrically connected to a control unit (not shown), and a control unit (not shown) electrically controls each component 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.

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

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

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

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

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

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

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

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

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

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

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

Meanwhile, the 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 amount of discharged fluid.

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

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

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

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

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

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

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

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

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

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

12 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. 11 can be driven by a motor driving apparatus, such as the one shown in Fig. 1, which drives the compressor motor 250b.

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

13 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).

14 is a view schematically showing the configuration of the refrigerator of Fig.

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. 14 can be driven by a motor drive 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 motor drive device, such as the one shown in Figure 1, that drives a refrigerator compartment fan motor (not shown) and a freezer compartment fan motor .

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

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

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

Claims (11)

A converter for converting input AC power to DC power and outputting the DC power to the dc stage;
A dc-stage capacitor connected to both ends of the dc stage;
An inverter for converting a DC power source of the dc stage into an AC power source and outputting the converted AC power source to the motor by a switching operation, the inverter including a plurality of sway arc switching elements and a lower arm switching element;
A first switching element and a second switching element which are disposed between the dc short capacitor and the converter and are connected in series to each other, a third switching element and a fourth switching element which are disposed between the dc short capacitor and the converter, A first impedance element connected between a first node and a ground terminal between the first switching element and the second switching element, a second impedance element connected between a second node between the third switching element and the fourth switching element, A second impedance element connected between the first and second impedance elements;
And a control unit for controlling operations of the inverter and the filter unit,
The impedance of the first impedance element and the impedance of the second impedance element are different from each other,
Wherein,
Controls the first switching element or the second switching element to be turned on or controls the third switching element or the fourth switching element to be turned on according to the noise signal of the dc stage,
Wherein the first switching element, the second switching element, and the first impedance element reduce the electromagnetic noise in the first frequency band of the electromagnetic noise,
Wherein the third switching element, the fourth switching element, and the second impedance element reduce electromagnetic noise in a second frequency band higher than the first frequency band. The method according to claim 1,
Wherein,
Outputs an inverter switching control signal to the inverter,
And outputs a filter switching control signal to the filter section in response to the inverter switching control signal. 3. The method of claim 2,
Wherein,
And generates and outputs the filter switching control signal for canceling a noise component generated in switching the inverter by the inverter switching control signal. The method according to claim 1,
Wherein,
Wherein the control unit controls the noise signal of the dc stage to flow to the ground terminal in accordance with the switching operation of the first switching element or the second switching element in the filter unit. delete The method according to claim 1,
Further comprising: a second filter unit disposed between the input AC power supply and the converter, the second filter unit including an inductor and a capacitor. delete delete The method according to claim 1,
A dc voltage detection unit detecting a voltage of the dc short-circuit capacitor;
And an output current detector disposed between the dc-terminal capacitor and the inverter to detect an output current flowing to the motor,
Wherein,
And controls the inverter and the filter unit based on the output current. 10. The method of claim 9,
Wherein,
An estimating unit that estimates a speed of the motor based on the detected output current;
A current command generator for generating a current command value based on the estimated speed and a speed command value;
A voltage command generator for generating a voltage command value based on the current command value and the detected output current; And
And a switching control signal output unit for outputting a switching control signal for driving the inverter based on the voltage command value. A home appliance comprising the motor drive device according to any one of claims 1 to 4, 6, 9 and 10.

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