KR102106912B1 - Motor driving apparatus and home appliance including the same - Google Patents

Abstract

The present invention relates to a motor drive and a home appliance having the same. A motor driving apparatus according to an embodiment of the present invention includes a dc stage resistor element disposed between a dc stage capacitor and an inverter, a current detector detecting current flowing through the dc stage resistor element, and an inverter based on the detected current. A control unit is provided, and the control unit controls, according to the diagnostic mode, to turn on only one switching element in the inverter, and when the detected level of the current is greater than or equal to the first level, short-circuiting the switching element that is not turned on ( short). Accordingly, in the motor drive device having the dc stage resistance element, it is possible to easily grasp whether the inverter is faulty or where the fault is.

Description

Motor driving apparatus and home appliance including the same

The present invention relates to a motor drive device and a home appliance having the same, and more specifically, to a motor drive device having a dc stage resistance element, a motor drive device capable of easily determining whether an inverter is faulty or where a failure occurs, and It relates to a home appliance having this.

The motor driving device is a device for driving a motor having a rotor that rotates and a stator wound with a coil.

On the other hand, in the motor drive device, an inverter that outputs AC power is essential for driving the motor.

The inverter can output AC power of various frequencies, and in particular, can operate in response to a motor load.

However, in response to various loads, when an inverter is operated, it is highly likely that any part of a plurality of switching elements of the inverter is disconnected or short-circuited.

On the other hand, in the event of an inverter failure, if it continues to drive, it affects not only the circuit around the inverter, but also the motor.

Therefore, research has been conducted on a method for easily determining whether or not the inverter has failed.

An object of the present invention is to provide a motor drive device and a home appliance having the same, which can easily grasp whether the inverter has a fault and a fault location in a motor drive device having a dc stage resistance element.

In order to achieve the above object, a motor drive device according to an embodiment of the present invention and a home appliance having the same, the dc stage resistance element disposed between the dc stage capacitor and the inverter, and the current detecting the current flowing through the dc stage resistance element A detection unit and a control unit for controlling the inverter based on the detected current, and the control unit, according to the diagnostic mode, controls only one switching element in the inverter to be turned on, and the level of the detected current is greater than or equal to the first level In the case, it is determined that the switching element that is not turned on is short.

On the other hand, the control unit of the motor driving apparatus according to the embodiment of the present invention, according to the diagnostic mode, when the level of the detected current is less than the first level, and controls so that only the three switching elements in the inverter is turned on, the detected current of When the level is equal to or less than the second level that is greater than the first level, it may be determined to be open for at least one switching element among turned-on switching.

Meanwhile, the control unit of the motor driving apparatus according to the embodiment of the present invention controls the switching elements in the inverter to be turned on one by one according to the diagnostic mode, and is detected when the first phase arm switching element is turned on among the plurality of phase cancer switching elements. When the level of the current is equal to or greater than the third level greater than the second level, the first lower arm switching element corresponding to the first upper arm switching element can be determined as a short circuit.

On the other hand, the control unit of the motor driving apparatus according to the embodiment of the present invention controls the plurality of upper and lower arm switching elements to be sequentially turned on one by one according to the diagnostic mode, and based on the level of each detected current, It can be determined whether or not the switching element in the inverter is short-circuited.

On the other hand, the controller of the motor driving apparatus according to the embodiment of the present invention, the lower the detected temperature, the control can be controlled such that the longer the turn-on period in which only one switching element is turned on.

On the other hand, the control unit of the motor driving apparatus according to the embodiment of the present invention controls, according to the diagnostic mode, only three switching elements of the plurality of upper arm switching elements and the lower arm switching elements to be sequentially turned on, and the level of each detected current Based on this, it can be determined whether the switching element in the inverter is disconnected or not.

On the other hand, the control unit of the motor driving apparatus according to the embodiment of the present invention, the lower the detected temperature, the control can be controlled so that the turn-on period in which only three switching elements are turned on.

Meanwhile, the controller of the motor driving apparatus according to the embodiment of the present invention may control the diagnostic mode to be performed when the motor is driven and before the motor alignment period.

According to an embodiment of the present invention, a motor drive device and a home appliance having the same include: a dc stage resistor element disposed between a dc stage capacitor and an inverter, a current detector detecting current flowing through the dc stage resistor element, and being detected. Based on the current, a control unit for controlling the inverter is provided, and the control unit controls, according to the diagnostic mode, to turn on only one switching element in the inverter, and when the detected level of the current is greater than or equal to the first level, it is not turned on. It is determined as a short for a switching element that is not. Accordingly, in the motor drive device having the dc stage resistance element, it is possible to easily grasp whether the inverter is faulty or where the fault is.

On the other hand, the control unit of the motor driving apparatus according to the embodiment of the present invention, according to the diagnostic mode, when the level of the detected current is less than the first level, and controls so that only the three switching elements in the inverter is turned on, the detected current of When the level is equal to or less than the second level that is greater than the first level, it may be determined to be open for at least one switching element among turned-on switching. Accordingly, in the motor drive device having the dc stage resistance element, it is possible to easily grasp whether the inverter is faulty or where the fault is.

Meanwhile, the control unit of the motor driving apparatus according to the embodiment of the present invention controls the switching elements in the inverter to be turned on one by one according to the diagnostic mode, and is detected when the first phase arm switching element is turned on among the plurality of phase cancer switching elements. When the level of the current is equal to or greater than the third level greater than the second level, the first lower arm switching element corresponding to the first upper arm switching element can be determined as a short circuit. Accordingly, in the motor drive device having the dc stage resistance element, it is possible to easily grasp whether the inverter is faulty or where the fault is.

On the other hand, the control unit of the motor driving apparatus according to the embodiment of the present invention controls the plurality of upper and lower arm switching elements to be sequentially turned on one by one according to the diagnostic mode, and based on the level of each detected current, It can be determined whether or not the switching element in the inverter is short-circuited. Accordingly, in the motor drive device having the dc stage resistance element, it is possible to easily grasp whether the inverter is faulty or where the fault is.

On the other hand, the controller of the motor driving apparatus according to the embodiment of the present invention, the lower the detected temperature, the control can be controlled such that the longer the turn-on period in which only one switching element is turned on. Accordingly, in the diagnostic mode, it is possible to perform preheating for the motor.

On the other hand, the control unit of the motor driving apparatus according to the embodiment of the present invention controls, according to the diagnostic mode, only three switching elements of the plurality of upper arm switching elements and the lower arm switching elements to be sequentially turned on, and the level of each detected current Based on this, it can be determined whether the switching element in the inverter is disconnected or not. Accordingly, in the motor drive device having the dc stage resistance element, it is possible to easily grasp whether the inverter is faulty or where the fault is.

On the other hand, the control unit of the motor driving apparatus according to the embodiment of the present invention, the lower the detected temperature, the control can be controlled so that the turn-on period in which only three switching elements are turned on. Accordingly, in the diagnostic mode, it is possible to perform preheating for the motor.

Meanwhile, the controller of the motor driving apparatus according to the embodiment of the present invention may control the diagnostic mode to be performed when the motor is driven and before the motor alignment period. Accordingly, it is possible to prevent burnout of the motor and the like.

1 illustrates an example of an internal block diagram of a motor drive device according to an embodiment of the present invention.
FIG. 2 is an example of an internal circuit diagram of the motor drive of FIG. 1.
3 is an internal block diagram of the inverter control unit of FIG. 2.
4 is a diagram illustrating an example of an output current detection unit.
5 is a diagram illustrating an example of an output current detection unit of a motor driving apparatus according to an embodiment of the present invention.
6 is a flowchart illustrating an operation method of a motor driving apparatus according to an embodiment of the present invention.
7A to 12D are views referred to for explaining the operation method of FIG. 6.
13 is a perspective view showing a laundry treatment apparatus as an example of a home appliance according to an embodiment of the present invention.
14 is an internal block diagram of the laundry treatment device of FIG. 13.
15 is a diagram illustrating a configuration of an air conditioner as another example of a home appliance according to an embodiment of the present invention.
16 is a schematic diagram of the outdoor unit and the indoor unit of FIG. 15.
17 is a perspective view showing a refrigerator as another example of a home appliance according to an embodiment of the present invention.
18 is a diagram briefly showing the configuration of the refrigerator of FIG. 17.

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

The suffixes "modules" and "parts" for components used in the following description are given simply by considering the ease of writing the present specification, and do not give meanings or roles particularly important in themselves. Therefore, the "module" and the "unit" may be used interchangeably.

The motor driving device described in this specification is to estimate the rotor position of the motor by a sensorless method, which is not equipped with a position sensor such as a hall sensor that senses the position of the rotor of the motor. It is a motor-driven device. Hereinafter, a sensorless motor driving device will be described.

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

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 is an example of an internal circuit diagram of the motor driving apparatus of FIG. 1.

Referring to the drawings, the motor driving apparatus 220 according to an embodiment of the present invention is for driving a motor in a sensorless manner, an inverter 420, an inverter control unit 430, and a temperature sensing unit (232).

In addition, the motor driving apparatus 220 according to an embodiment of the present invention may include a converter 410, a dc stage voltage detector (B), a dc stage capacitor (C), and an output current detector (Edc). In addition, the motor driving device 220 may further include an input current detection unit A, a reactor L, and the like.

The motor driving apparatus 220 according to an embodiment of the present invention detects a phase current by using one dc stage resistance element (Rdc) disposed between a dc stage capacitor and an inverter.

At this time, the inverter control unit 430 controls the switching element in the inverter 420 by controlling the spatial vector-based pulse width.

To this end, the inverter controller 430 receives phase current information that is sequentially detected using one dc terminal resistance element, and based on this, based on a space vector-based pulse width variable control, in the inverter 420 The switching element can be controlled.

On the other hand, when using one dc terminal resistance element (Rdc), since it is necessary to sequentially detect the phase current, when the inverter 420 fails, it is not easy to determine whether or not the failure and the location of the failure.

Accordingly, in the present invention, a method is provided for easily grasping whether the inverter 420 has a failure and a failure location in the value of the motor driving field 220 with one dc terminal resistance element (Rdc).

To this end, the motor driving apparatus 220 according to an embodiment of the present invention includes an inverter 420, a dc stage resistance element (Rdc) disposed between the dc stage capacitor and the inverter 420, and a dc stage resistance element ( Rdc) is provided with a current detection unit (Edc) for detecting the current flowing through, and an inverter control unit 430 for controlling the inverter 420 based on the detected current.

Then, the inverter control unit 430, according to the diagnostic mode, controls only one switching element in the inverter 420 to be turned on, and when the detected level of the current (Idc) is greater than or equal to the first level, the switching is not turned on The device is judged to be short. Accordingly, in the motor driving device 220 having the dc terminal resistance element Rdc, it is possible to easily grasp whether the inverter 420 has failed and where the failure is.

On the other hand, the inverter control unit 430 of the motor driving device 220 according to an embodiment of the present invention, according to the diagnostic mode, when the level of the detected current (Idc) is less than the first level, the three in the inverter 420 When only the switching element is controlled to be turned on, and the level of the detected current Idc is equal to or less than the second level greater than the first level, it can be determined as open for at least one switching element among the turned on switching. Accordingly, in the motor driving device 220 having the dc terminal resistance element Rdc, it is possible to easily grasp whether the inverter 420 has failed and where the failure is.

Meanwhile, the inverter control unit 430 of the motor driving apparatus 220 according to the embodiment of the present invention controls the switching elements in the inverter 420 to be turned on one by one according to the diagnostic mode, and the plurality of phase-arm switching elements Sa When the level of the current Idc detected during turn-on of the first phase-arm switching elements Sa to Sc among ~ Sc is equal to or greater than the third level greater than the second level, it corresponds to the first phase-arm switching elements Sa to Sc The first lower arm switching elements S'a to S'c can be judged as a short circuit. Accordingly, in the motor driving device 220 having the dc terminal resistance element Rdc, it is possible to easily grasp whether the inverter 420 has failed and where the failure is.

On the other hand, the inverter control unit 430 of the motor driving apparatus 220 according to an embodiment of the present invention, according to the diagnostic mode, a plurality of upper and lower switching elements (Sa ~ Sc) and the lower arm switching elements (S'a ~ S'c) ) Is sequentially controlled to turn on one by one, and it is possible to determine whether or not the switching element in the inverter 420 is shorted based on the level of the current Idc detected. Accordingly, in the motor driving device 220 having the dc terminal resistance element Rdc, it is possible to easily grasp whether the inverter 420 has failed and where the failure is.

On the other hand, the inverter control unit 430 of the motor driving device 220 according to an embodiment of the present invention, the lower the temperature detected by the temperature sensing unit 232, the longer the turn-on period in which only one switching element is turned on Control. Accordingly, in the diagnostic mode, it is possible to perform preheating for the motor.

On the other hand, the inverter control unit 430 of the motor driving apparatus 220 according to an embodiment of the present invention, according to the diagnostic mode, a plurality of upper and lower switching elements (Sa ~ Sc) and the lower arm switching elements (S'a ~ S'c) ) Is controlled so that only three switching elements are sequentially turned on, and it is possible to determine whether the switching element in the inverter 420 is disconnected based on the level of the current Idc, which is detected. Accordingly, in the motor driving device 220 having the dc terminal resistance element Rdc, it is possible to easily grasp whether the inverter 420 has failed and where the failure is.

On the other hand, the inverter control unit 430 of the motor driving device 220 according to an embodiment of the present invention, the lower the temperature detected by the temperature sensing unit 232, the longer the turn-on period in which only three switching elements are turned on Control. Accordingly, in the diagnostic mode, it is possible to perform preheating for the motor.

Meanwhile, the inverter control unit 430 of the motor driving apparatus 220 according to the embodiment of the present invention may control the diagnostic mode to be performed before the motor alignment period when the motor is driven. Accordingly, it is possible to prevent burnout of the motor and the like.

Hereinafter, the operation of each of the constituent units in the motor drive unit 220 of FIGS. 1 and 2 will be described.

The reactor L is disposed between the commercial AC power sources 405 and v _s and the converter 410 to perform power factor correction or boost operation. In addition, the reactor L may perform a function of limiting harmonic currents due to high-speed switching of the converter 410.

The input current detector A can detect the input current i _s input from the commercial AC power supply 405. To this end, as the input current detector A, a current trnasformer (CT), a shunt resistor, or the like can be used. The detected input current i _s may be input to the inverter control unit 430 as a pulsed discrete signal.

The converter 410 converts and outputs the commercial AC power 405 that has passed through the reactor L into a DC power. Although the commercial AC power source 405 is illustrated as a single-phase AC power source in the drawing, it may be a three-phase AC power source. The internal structure of the converter 410 also varies according to the type of the commercial AC power source 405.

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

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

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

When the converter 410 includes a switching element, a step-up operation, power factor improvement, and DC power conversion may be performed by the switching operation of the switching element.

The dc stage capacitor (C) smooths the input power and stores it. In the drawing, one device is illustrated as a dc terminal capacitor (C), but a plurality of devices are provided to ensure device stability.

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

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

The dc stage voltage detector B may detect the dc stage voltage Vdc that is both ends of the dc stage capacitor C. To this end, the dc stage voltage detector B may include a resistance element, an amplifier, and the like. The detected dc stage voltage (Vdc) may be input to the inverter control unit 430 as a pulsed discrete signal.

The inverter 420 includes a plurality of inverter switching elements, and converts the DC power supply (Vdc) smoothed by the on / off operation of the switching element into three-phase AC power (va, vb, vc) of a predetermined frequency, thereby making it three-phase. It can be output to the synchronous motor 230.

In the inverter 420, the upper and lower switching elements Sa, Sb and Sc and the lower and lower switching elements S'a, S'b and S'c 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 to each other (Sa & S'a, Sb & S'b, Sc & S'c). Diodes are connected in reverse 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 operation of each switching element based on the inverter switching control signal Sic from the inverter control unit 430. Accordingly, the three-phase AC power having a predetermined frequency is output to the three-phase synchronous motor 230.

The inverter control unit 430 may control the switching operation of the inverter 420 based on the sensorless method. To this end, the inverter control unit 430 may receive an output current i _o detected by the output current detection unit Edc.

In order to control the switching operation of the inverter 420, the inverter control unit 430 outputs the inverter switching control signal Sic to the inverter 420. The inverter switching control signal Sic is a pulse width modulation method (PWM) switching control signal, which is generated and output based on the output current i _o detected by the output current detection unit Edc. 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. 3.

The output current detector Edc detects the output current i _o flowing between the three-phase motors 230 by using a dc stage resistor element Rdc disposed between the dc stage capacitor C and the inverter 420. do.

In particular, the output current detector Edc may sequentially detect the output currents ia, ib, and ic of each phase.

To this end, the output current detection unit Edc may include a current trnasformer (CT).

The detected output current (i _o ) is a discrete signal in the form of a pulse, and may be applied to the inverter control unit 430, and the inverter switching control signal (Sic) based on the detected output current (i _o ) Is created. Hereinafter, it can be described in parallel that the detected output current (i _o ) is the three-phase output current (ia, ib, ic).

Meanwhile, the three-phase motor 230 is provided with a stator and a rotor, and AC power of a predetermined frequency is applied to a coil of the stator of each phase (a, b, c phase), so that the rotor rotates. Will do.

Such a motor 230 is, for example, a surface-mounted permanent magnet synchronous motor (Surface-Mounted Permanent-Magnet Synchronous Motor; SMPMSM), an embedded permanent magnet synchronous motor (Interior Permanent Magnet Synchronous Motor; IPMSM), and a synchronous reel A Synchronous Reluctance Motor (Synrm) may be included. Among them, SMPMSM and IPMSM are Permanent Magnet Synchronous Motor (PMSM) with permanent magnet applied, and Synrm has no permanent magnet.

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

Referring to FIG. 3, the inverter control unit 430 includes: an axis conversion unit 310, a speed calculation unit 320, a current command generation unit 330, a voltage command generation unit 340, an axis conversion unit 350, and A switching control signal output unit 360 may be included.

The axis conversion unit 310 may convert the three-phase output current (ia, ib, ic) or the estimated current detected by the output current detection unit (Edc) into a two-phase current (iα, iβ) in the stop coordinate system. have.

Meanwhile, the axis converter 310 may convert the two-phase currents iα and iβ of the stationary coordinate system into two-phase currents id and iq of the rotary coordinate system.

)와 연산된 속도(

)를 출력할 수 있다.The speed calculating unit 320 is a position calculated based on the two-phase currents iα and iβ of the stationary coordinate system axially changed by the axis converting unit 310 (

) And calculated speed (

).

)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, the calculation speed (

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

) And the speed command value (ω ^* _r ), the PI controller 335 performs PI control and generates a current command value (i ^* _q ). In the drawing, as the current command value, the q-axis current command value (i ^* _q ) is illustrated, but unlike the drawing, it is also possible to generate the d-axis current command value (i ^* _d ) together. Meanwhile, the value of the d-axis current command value (i ^* _d ) may be set to 0.

Meanwhile, the current command generation unit 330 may further include a limiter (not shown) that limits the level so that the current command value i ^* _q does not exceed the allowable range.

Next, the voltage command generation unit 340, the d-axis, q-axis current (i _d , i _q ) axis-converted in the two-phase rotation coordinate system in the axis conversion unit, the current command value in the current command generation unit 330, etc. Based on i ^* _d , i ^* _q ), d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) are generated. For example, the voltage command generation unit 340 performs PI control in the PI controller 344 based on the difference between the q-axis current i _q and the q-axis current command value i ^* _q , q The axial voltage setpoint (v ^* _q ) can be generated. In addition, the voltage command generation unit 340 performs PI control in the PI controller 348 based on the difference between the d-axis current i _d and the d-axis current command value i ^* _d , and the d-axis voltage A setpoint (v ^* _d ) can be generated. Meanwhile, the voltage command generation unit 340 may further include a limiter (not shown) that limits the level so that the d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) do not exceed an allowable range. .

On the other hand, the generated d-axis and q-axis voltage command values (v ^* _d , 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, the position calculated by the speed calculation unit 320 (

), 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 performs conversion from a two-phase rotational coordinate system to a two-phase stationary coordinate system. At this time, the position calculated by the speed calculator 320 (

) Can be used.

Then, the axis conversion unit 350 performs conversion from a two-phase stationary coordinate system to a three-phase stationary coordinate system. Through this conversion, the axis conversion unit 1050 outputs a three-phase output voltage command value (v ^* a, v ^* b, v ^* c).

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

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

On the other hand, as described above, the motor driving device 220, through the control of the inverter 420, in order to perform vector (vector) control to drive the motor 230, the output current (io) flowing in the motor (motor) In particular, it is essential to detect the phase current.

The inverter control unit 430 may control the motor 230 to a desired speed and torque using the sensed phase current, using the current command generation unit 330 and the voltage command generation unit 340. There will be.

4 is a diagram illustrating an example of an output current detection unit.

Referring to the drawing, the output current detection unit Ex of FIG. 4 includes two current sensors CSa for sensing the a-phase current and the c-phase current among the three-phase currents (a, b, and c-phase currents) flowing through the motor 230. , CSc).

On the other hand, the b-phase current can be calculated using the condition that the sum of the three-phase current is zero.

On the other hand, as compared to the method of FIG. 4, as shown in FIG. 5, a method of sensing a motor current using a single dc terminal resistance element has an advantage in that manufacturing cost is reduced and installation is easy.

Accordingly, in the present invention, a method of sensing a motor current using a single shunt resistor element as shown in FIG. 5 will be mainly described.

5 is a diagram illustrating an example of an output current detection unit of a motor driving apparatus according to an embodiment of the present invention.

Referring to the drawings, the output current detection unit Edc may include a dc terminal resistance element Rdc disposed between the dc terminal capacitor C and the inverter 420.

The inverter control unit 430 may calculate the current flowing through the motor 230 based on the current flowing through the dc terminal resistance element Rdc, and control the inverter 420 based on the calculated motor current.

As shown in the figure, a current acquisition method using a dc stage resistance element (Rdc) is called a shunt algorithm.

The shunt algorithm is divided into 1-shunt, 2-shunt, and 3-shunt according to the position and number of shunt resistor elements. In the present invention, the 1-shunt method is used. Describe.

According to this 1-shunt (shunt) method, the three-phase current (a, b, c phase current) flowing in the motor 230 is obtained with only one shunt resistor element disposed in the dc stage.

Therefore, compared to FIG. 4, the current sensor can be reduced, and a peripheral circuit such as a voltage amplifier and an A / D port can be reduced compared to a two-shunt and three-shunt method. In addition, there are many advantages, such as a reduction in the manufacturing cost and volume of the motor drive device 220.

The motor driving apparatus 220 according to an embodiment of the present invention detects a phase current using one dc stage resistor element disposed between a dc stage capacitor and an inverter.

6 is a flowchart illustrating an operation method of a motor driving apparatus according to an embodiment of the present invention, and FIGS. 7A to 12D are views referred to for explaining the operation method of FIG. 6.

Referring to the drawing, the inverter control unit 430 may control to perform a diagnostic mode when the power is turned on or according to a user input (S610).

At this time, the diagnostic mode is for protecting the motor 230 and the inverter 420, and may be performed to determine whether or not the inverter 420 has a failure or a failure location.

Accordingly, the inverter control unit 430 may control the diagnostic mode to be performed when the motor is driven and before the motor alignment period.

On the other hand, before the motor alignment period, if the motor needs to warm up, before the motor warm-up period, the diagnostic mode may be performed.

Alternatively, the inverter control unit 430 may control the diagnostic mode and the preheating mode to be performed together.

When the diagnostic mode and the preheating mode are performed together, the inverter control unit 430 may control the duration of the diagnostic mode to vary according to the temperature around the motor sensed by the temperature sensing unit 232.

In particular, the inverter control unit 430 may control to increase the duration of the diagnostic mode for preheating, as the temperature around the motor sensed by the temperature sensing unit 232 is lower.

More specifically, the inverter control unit 430, the lower the temperature around the motor sensed by the temperature sensing unit 232, for preheating, only one switching element of the inverter 420 is turned on, or the inverter 420 It can be controlled so that the period during which only the three switching elements of the on is longer.

Next, the inverter control unit 430 may control such that only one switching element in the inverter 420 is turned on according to the start of the diagnostic mode (S615).

Next, the inverter control unit 430 determines whether or not the level of the current Idc detected by the current detection unit Edc is greater than or equal to the first level (S620), and if applicable, short-circuits the switching element that is not turned on. It can be determined as (short) (S625).

Next, when the level of the current Idc detected by the current detection unit Edc is less than the first level, the inverter control unit 430 may control such that only three switching elements in the inverter 420 are turned on (S615). .

Next, the inverter control unit 430 determines whether the level of the detected current Idc is less than or equal to the second level greater than the first level (S635), and, if applicable, to at least one switching element among turned-on switching. Can be determined as open (S640).

Meanwhile, when only one switching element is turned on, the inverter control unit 430 has a level of a current Idc detected by the current detection unit Edc less than a first level, and only three switching elements are turned on. When the level of the current Idc detected by the current detection unit Edc exceeds the second level, it may be determined that the inverter 420 is normal (S645).

7A to 8 are diagrams referred to whether a short circuit is determined according to the on of one switching element.

FIG. 7A shows that during the P1 period, only the first upper arm switching element Sa among the plurality of upper arm switching elements Sa to Sc and lower arm switching elements S'a to S'c is turned on, and the remaining five switch elements are shown in FIG. Illustrates that it is off.

According to this, since all of the lower arm switching elements S'a to S'c are turned off, the first upper arm switching element Sa is also turned on, and no current flows through the current detection unit Idc, so that the current is at a zero level. It is normal that is detected.

However, when the first lower arm switching element S'a is short-circuited, according to the turn-on of the first upper arm switching element Sa, the current detection unit Idc has a third that is much larger than the first level and the second level. Current above the level can be detected. That is, a grounding current can be detected.

Accordingly, the inverter control unit 430 may determine that the first lower arm switching element S'a is short-circuited when a current of a third level or higher, that is, a ground fault current is detected.

On the other hand, when the second lower arm switching element S'b or the third lower arm switching element S'c is short-circuited, according to the turn-on of the first upper arm switching element Sa, the current detection unit Idc is provided with A current of one level or higher can be detected.

Accordingly, the inverter control unit 430, the second lower arm switching element (S'b) or the third lower arm switching element (S) when the current of the first level or more is detected when the first upper arm switching element (Sa) is turned on. It can be determined that 'c) is a short circuit.

7B, during the P2 period, only the second upper arm switching element Sb among the plurality of upper arm switching elements Sa to Sc and the lower arm switching elements S'a to S'c is turned on, and the remaining five switch elements Illustrates that it is off.

According to this, since all of the lower arm switching elements S'a to S'c are turned off, the second upper arm switching element Sb is also turned on, and no current flows through the current detection unit Idc, so that the current is 0 level. It is normal that is detected.

However, when the second lower arm switching element S'b is short-circuited, according to the turn-on of the second upper arm switching element Sb, the current detection unit Idc has a third that is much larger than the first level and the second level. Current above the level can be detected. That is, a grounding current can be detected.

Accordingly, the inverter control unit 430 may determine that the second lower arm switching element S'b is short-circuited when a current of a third level or higher, that is, a ground fault current is detected.

On the other hand, when the first lower arm switching element S'a or the third lower arm switching element S'c is short-circuited, according to the turn-on of the second upper arm switching element Sb, the current detection unit Idc is provided with a first A current of one level or higher can be detected.

Accordingly, the inverter control unit 430, the first lower arm switching element (S'a) or the third lower arm switching element (S'a) when a current of a first level or more is detected when the second upper arm switching element (Sb) is turned on. It can be determined that 'c) is a short circuit.

7C, during the P3 period, only the third upper arm switching element Sc among the plurality of upper arm switching elements Sa to Sc and lower arm switching elements S'a to S'c is turned on, and the remaining five switch elements Illustrates that it is off.

According to this, since all of the lower arm switching elements S'a to S'c are turned off, the third phase arm switching element Sc is also turned on, and no current flows through the current detection unit Idc, so that the current is at a zero level. It is normal that is detected.

However, when the third lower arm switching element S'c is short-circuited, according to the turn-on of the third upper arm switching element Sc, the current detection unit Idc has a third that is much larger than the first level and the second level. Current above the level can be detected. That is, a grounding current can be detected.

Accordingly, the inverter control unit 430 may determine that the third lower arm switching element S'c is short-circuited when a current of a third level or higher, that is, a ground fault current is detected.

Meanwhile, when the first lower arm switching element S'a or the second lower arm switching element S'b is short-circuited, according to the turn-on of the third upper arm switching element Sc, A current of one level or higher can be detected.

Accordingly, the inverter control unit 430, the first lower arm switching element (S'a) or the second lower arm switching element (S) when the current of the first level or more is detected when the third upper arm switching element (Sc) is turned on. It can be determined that 'b) is a short circuit.

7A to 7C, in the period P4 to P6, the first lower arm switching element S'a, the second lower arm switching element S'b, and the third lower arm switching element S'c, respectively, It may be turned on, and accordingly, it may be determined whether the first to third phase-arm switching elements are short-circuited.

Meanwhile, the inverter control unit 430 may control to output a switching control signal Sic of a fixed duty to the inverter 420 for turning on only one switching element in the inverter 420 when the diagnostic mode is performed. . For example, it may be controlled to output the switching control signal Sic of a fixed duty of approximately 20% or less to the inverter 420. Accordingly, the diagnostic mode can be stably performed.

Fig. 8 is a diagram showing the on timing of the switching elements in the inverter sequentially from the P1 period to the P6 period, whereby a switching element capable of short circuit determination is illustrated.

9A to 10 are diagrams referred to whether or not the disconnection is determined according to the on of the three switching elements.

FIG. 9A shows the first upper arm switching element Sa and the second lower arm switching element S'b among the plurality of upper arm switching elements Sa to Sc and the lower arm switching elements S'a to S'c in the period P7. ), Only the third lower arm switching element S'c is turned on, and the other three switch elements are turned off.

According to this, it is normal that the current flowing through the first upper arm switching element Sa, the second lower arm switching element S'b, and the third lower arm switching element S'c is detected according to path1.

However, when the first phase-arm switching element Sa is disconnected, the current may not be detected. That is, a current below the second level can be detected.

Accordingly, the inverter control unit 430 may determine that the first phase-arm switching element Sa is disconnected when a current lower than the second level is detected.

Meanwhile, when either the second lower arm switching element S'b or the third lower arm switching element S'c is disconnected, the second lower arm switching element S'b or the third lower arm switching element S ' Since the current flows through the other of c), a current exceeding the second level may be detected in the current detector Idc.

Accordingly, the inverter control unit 430 cannot determine the disconnection when it is one of the second lower arm switching element S'b or the third lower arm switching element S'c.

9B, during the P8 period, the second upper arm switching element Sb and the first lower arm switching element S'a among the plurality of upper arm switching elements Sa to Sc and the lower arm switching elements S'a to S'c. ), Only the third lower arm switching element S'c is turned on, and the other three switch elements are turned off.

According to this, it is normal that the current flowing through the second upper arm switching element Sb, the first lower arm switching element S'a, and the third lower arm switching element S'c is detected according to path2.

However, when the second phase-arm switching element Sb is disconnected, the current may not be detected. That is, a current below the second level can be detected.

Accordingly, the inverter control unit 430 may determine that the second phase-arm switching element Sb is disconnected when a current lower than or equal to the second level is detected.

Meanwhile, when either the first lower arm switching element S'a or the third lower arm switching element S'c is disconnected, the first lower arm switching element S'a or the third lower arm switching element S ' Since the current flows through the other of c), a current exceeding the second level may be detected in the current detector Idc.

Accordingly, the inverter control unit 430 cannot determine the disconnection when it is one of the first lower arm switching element S'a or the third lower arm switching element S'c.

FIG. 9C shows the third upper arm switching element Sc and the first lower arm switching element S'a among the plurality of upper arm switching elements Sa to Sc and the lower arm switching elements S'a to S'c in the period P9. ), Only the second lower arm switching element S'b is turned on, and the other three switch elements are turned off.

According to this, it is normal that the current flowing through the third upper arm switching element Sc, the first lower arm switching element S'a, and the second lower arm switching element S'b is detected according to path3.

However, when the third phase arm switching element Sc is disconnected, the current may not be detected. That is, a current below the second level can be detected.

Accordingly, the inverter control unit 430 may determine that the third phase-arm switching element Sc is disconnected when a current lower than or equal to the second level is detected.

Meanwhile, when either the first lower arm switching element S'a or the second lower arm switching element S'b is disconnected, the first lower arm switching element S'a or the second lower arm switching element S ' Since the current flows through the other of b), a current exceeding the second level may be detected in the current detector Idc.

Accordingly, the inverter control unit 430 cannot determine the disconnection when it is one of the first lower arm switching element S'a or the second lower arm switching element S'b.

9A to 9C, in the period P10 to P12, one lower arm switching element and two upper arm switching elements may be turned on, respectively, as shown in FIG. 10, and accordingly, the first to third It is possible to determine whether the lower arm switching elements S'a to S'c are disconnected.

Meanwhile, the inverter control unit 430 may control to output the switching control signal Sic of a fixed duty to the inverter 420 for turning on only three switching elements in the inverter 420 when the diagnostic mode is performed. . For example, it may be controlled to output the switching control signal Sic of a fixed duty of approximately 20% or less to the inverter 420. Accordingly, the diagnostic mode can be stably performed.

Fig. 10 is a diagram showing the on timing of switching elements in the inverter sequentially from the period P7 to the period P12, whereby the detected current Idc and the switching element capable of determining disconnection are respectively illustrated.

11A illustrates the current waveform idca1 when it is detected by the current detection unit Edc while only one switching element is turned on during the periods P1 to P6 described above.

As shown in the figure, when only one switching element is turned on, when all the switching elements in the inverter 420 are normal, the current waveform idca1 has a zero level.

Accordingly, the inverter control unit 430 may determine that the inverter 420 is normal when the current waveform idca1 of FIG. 11A is detected.

Next, FIG. 11B illustrates the current waveform idca2 when it is detected by the current detection unit Edc while only one switching element is turned on during the periods P1 to P6 described above.

In the drawing, it is illustrated that the level of the current waveform idca2 exceeds the third level in the P2 period, particularly at the start time 1110 of the P2 period.

As described above, when the current waveform idca2 of FIG. 11B is detected, the inverter control unit 430 may determine that the second lower arm switching element S'b is short-circuited.

On the other hand, in Figs. 11A to 11B, the width of each period of the period P1 to P6 is the same as Tex1.

When the temperature sensed by the temperature sensing unit 232 is approximately 15 degrees or more, the inverter control unit 430 may control the width of each period of the period P1 to P6 to be set to Tex1.

On the other hand, the inverter control unit 430, when the temperature detected by the temperature sensing unit 232 is approximately 5 degrees or less, for preheating, the width of each period of P1 to P6 period is set to be set to a Tex2 period wider than Tex1 can do. This will be described with reference to FIG. 11C.

FIG. 11C illustrates the current waveform idca3 when the current detection unit Edc is detected in a state in which only one switching element is turned on during periods P'1 to P'6 having a width of Tex2.

As shown in the figure, when only one switching element is turned on, when all the switching elements in the inverter 420 are normal, the current waveform idca1 has a zero level.

Therefore, the inverter control unit 430 may determine that the inverter 420 is normal when the current waveform idca3 of FIG. 11C is detected.

FIG. 12A illustrates the current waveform idcb1 when it is detected by the current detection unit Edc while only three switching elements are turned on during the periods P7 to P12 described above.

As shown in the figure, in a state in which only three switching elements are turned on, when the maximum level of the current waveform idcb1 exceeds the second level, the inverter control unit 430 may determine that the inverter 420 is normal.

Next, FIG. 12B illustrates the current waveform idcb2 when detected by the current detection unit Edc while only three switching elements are turned on during the periods P7 to P12 described above.

In the drawing, it is illustrated that in the P4 period 1210, the level of the current waveform idcb2 appears as a zero level that is less than or equal to the second level.

As described above, when the current waveform idcb2 of FIG. 12B is detected, the inverter control unit 430 may determine that the second lower arm switching element S'b is disconnected.

Next, FIG. 12C illustrates the current waveform idcb2b when detected by the current detection unit Edc in a state where only three switching elements are turned on during the periods P7 to P12 described above.

In the drawing, it is exemplified that the level of the current waveform idcb2b appears at the zero level, which is equal to or less than the second level, in the P6 period 1215.

As described above, when the current waveform idcb2b in FIG. 12B is detected, the inverter control unit 430 may determine that the third lower arm switching element S'c is disconnected.

On the other hand, in Figs. 12A to 12C, the width of each period of the periods P7 to P12 is the same as Tex1.

When the temperature sensed by the temperature sensing unit 232 is approximately 15 degrees or more, the inverter control unit 430 may control the width of each period of the period P7 to P12 to be set to Tex1.

On the other hand, the inverter control unit 430, when the temperature detected by the temperature sensing unit 232 is approximately 5 degrees or less, for preheating, the width of each period of P7 to P12 period is set to be set to a Tex2 period wider than Tex1 can do. This will be described with reference to FIG. 12D.

FIG. 12D illustrates the current waveform idcb3 when detected by the current detection unit Edc in a state in which only three switching elements are turned on during the periods P'7 to P'12 in which the width of the period is Tex2.

As shown in the figure, when only three switching elements are turned on, and only three switching elements are turned on, when the maximum level of the current waveform idcb1 is greater than the second level, the inverter control unit 430 includes: 420) can be determined to be normal.

Meanwhile, the above-described motor driving device 220 may be provided in various devices and used. For example, it can be used in laundry treatment devices, air conditioners, refrigerators, water purifiers, and cleaners among home appliances. In addition, it is applicable to a vehicle, a robot, a drone, etc. that can be operated by a motor.

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

Referring to the drawings, the laundry treatment apparatus 100a according to an embodiment of the present invention is a front load type laundry treatment apparatus in which the fabric is inserted into the laundry tank in the front direction. The laundry treatment apparatus of the front type is a concept including a washing machine for performing washing, rinsing and dehydration by inserting a cloth, or a dryer for drying by inserting a wet cloth, and hereinafter, the washing machine is mainly described.

The laundry treatment apparatus 100a of FIG. 13 is a laundry-type laundry treatment apparatus, the cabinet 110 forming the exterior of the laundry treatment apparatus 100a, and the cabinet 110 disposed inside and supported by the cabinet 110 The tub 120 to be disposed inside the tub 120, the washing tank 122 in which the cloth is washed, the motor 130 driving the washing tank 122, and the cabinet body 111 disposed outside the cabinet 110 It includes a washing water supply device (not shown) for supplying washing water to the inside, and a drainage device (not shown) that is formed under the tub 120 to discharge the washing water to the outside.

A plurality of through holes 122A are formed in the washing tank 122 so that the washing water passes, and after the laundry is lifted to a certain height when the washing tank 122 is rotated, a lifter is installed on the inner side of the washing tank 112 so as to fall by gravity. 124 may be disposed.

The cabinet 110 is disposed on the front of the cabinet body 111, the cabinet body 111, and the cabinet cover 112 to be coupled, and the cabinet cover 112 is disposed on the upper side and is controlled to be coupled to the cabinet body 111. It includes a panel 115 and a top plate 116 disposed on the control panel 115 and coupled to the cabinet body 111.

The cabinet cover 112 includes a fabric entrance and exit hole 114 formed to allow the entrance and exit of the fabric, and a door 113 that is rotatably disposed left and right to open and close the fabric entrance and exit hole 114.

The control panel 115 includes operation keys 117 for manipulating the operation state of the laundry treatment device 100a, and display devices disposed on one side of the operation keys 117 and displaying the operation state of the laundry treatment device 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 the control unit (not shown) electrically controls each component of the laundry treatment device 100a. do. The operation of the control unit (not shown) will be described later.

Meanwhile, an auto balance (not shown) may be provided in the washing tank 122. The auto balance (not shown) is for reducing vibration generated according to the eccentric amount of laundry accommodated in the washing tank 122, and may be implemented as a liquid balance, a ball balance, or the like.

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

14 is an internal block diagram of the laundry treatment device of FIG. 13.

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

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

In addition, the control unit 210 may control the display 18 to display a washing course, washing time, dehydration time, rinsing time, or the like, or a current operating 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, the inside or outside of the motor 230, for detecting the position of the rotor of the motor, the position detection unit is not provided. That is, the driving unit 220 controls the motor 230 by a sensorless method.

The driving unit 220 is for driving the motor 230, an inverter (not shown), an inverter control unit (not shown), and an output current detection unit (Edc in FIG. 2) that detects an output current flowing through the motor 230 In addition, an output voltage detector (F in FIG. 2) for detecting the output voltage vo applied to the motor 230 may be provided. In addition, the driving unit 220 may be a concept that further includes 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 io 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 in FIG. 2), based on the output current (io) and the output voltage (vo), generates a pulse width modulation (PWM) switching control signal (Sic in FIG. 2), the inverter When output to (not shown), the inverter (not shown) performs a high-speed switching operation to supply AC power of a predetermined frequency to the motor 230. Then, the motor 230 is rotated by an AC power source having a predetermined frequency.

Meanwhile, the driving unit 220 may correspond to the motor driving device 220 of FIG. 1.

Meanwhile, the control unit 210 may sense the amount of cloth based on the output current i _o flowing through the motor 230. For example, while the washing tub 122 is rotating, the amount of cloth may be detected based on the current value i _o of the motor 230.

In particular, the control unit 210 can accurately detect the amount of the cloth by using the stator resistance and the inductance value of the motor measured in the motor alignment section when detecting the amount.

Meanwhile, the control unit 210 may detect the eccentricity amount of the washing tank 122, that is, the unbalance (UB) of the washing tank 122. The eccentricity detection may be performed based on the ripple component of the output current i _o flowing in the motor 230 or the rotation speed change amount of the washing tank 122.

In particular, the control unit 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 section when detecting the amount of cloth.

15 is a diagram illustrating a configuration of an air conditioner as 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. 15.

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

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

The outdoor unit (21b) is a compressor (not shown) that receives and compresses refrigerant, an outdoor heat exchanger (not shown) that exchanges refrigerant with outdoor air, and an accumulator (not shown) that extracts gas refrigerant from the supplied refrigerant and supplies it to the compressor. City), and a four-way valve (not shown) for selecting a flow path of the refrigerant according to the heating operation. In addition, a plurality of sensors, valves, and an oil recovery device are further included, but a description of the configuration will be omitted below.

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

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

The indoor unit (31b) receives refrigerant from the outdoor unit (21b) and discharges cold and hot air into the room. The indoor unit 31b includes an indoor heat exchanger (not shown), an indoor 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 21b and the indoor unit 31b are connected by a communication line to transmit and receive mutual data, and the outdoor unit and the indoor unit are connected to a remote controller (not shown) or wired or wirelessly to operate under the control of a remote controller (not shown). can do.

The remote control (not shown) is connected to the indoor unit 31b, and inputs a user's control command into the indoor unit, and receives and displays status information of the indoor unit. At this time, the remote control may communicate with wired or wireless depending on the type of connection with the indoor unit.

16 is a schematic diagram of the outdoor unit and the indoor unit of FIG. 15.

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

The outdoor unit 21b includes a compressor 102b serving to compress the refrigerant, an electric motor 102bb for the compressor driving the compressor, an outdoor heat exchanger 104b serving to dissipate the compressed refrigerant, and outdoor An outdoor fan (105b) disposed on one side of the heat exchanger (104b) to promote heat dissipation of the refrigerant and an outdoor fan (105b) consisting of an electric fan (105bb) for rotating the outdoor fan (105ab), and expansion to expand the condensed refrigerant Mechanism (106b), the cooling / heating switch valve (110b) for changing the flow path of the compressed refrigerant, and accumulator (103b) for temporarily storing the vaporized refrigerant to remove moisture and foreign substances, and then supplying a refrigerant at a constant pressure to the compressor And the like.

The indoor unit (31b) is disposed indoors to perform the cooling / heating function, an indoor heat exchanger (109b), and an indoor fan (109ab) and indoors arranged on one side of the indoor heat exchanger (109b) to promote heat dissipation of refrigerant. And an indoor blower 109b made of an electric motor 109bb for rotating the fan 109ab.

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

In addition, the air conditioner 100b may be configured with a cooler that cools the room, or may be configured with a heat pump that cools or heats the room.

The compressor 102b in the outdoor unit 21b of FIG. 15 may be driven by a motor driving device, such as 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 device, such as FIG. 1, which drives the indoor fan motor 109bb and the outdoor fan motor 150bb, respectively.

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

Referring to the drawings, the refrigerator 100c according to the present invention, although not shown, shields the freezer compartment door 120c and the freezer compartment door 120c, which has an internal space partitioned by a freezer compartment and a freezer compartment, and a freezer compartment A schematic appearance is formed by the refrigerator compartment door 140c.

And, the front of the freezer compartment door 120c and the freezer compartment door 140c is further provided with a door handle 121c that protrudes forward, so that the user can easily grip and rotate the freezer compartment door 120c and the freezer compartment door 140c. To be able to.

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 storage such as beverages contained therein without opening the refrigerator compartment door 140c.

And, the front of the freezer compartment door 120c may be provided with a dispenser 160c, which is a convenient means for allowing a user to easily take out ice or drinking water without opening the freezer compartment door 120c, and such a dispenser 160c A control panel 210c that controls a driving operation of the refrigerator 100c and shows the state of the refrigerator 100c in operation on the screen may be further provided on the upper side.

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

On the other hand, the inner upper portion of the freezer (not shown), the ice bank mounted on the inside of the freezer (not shown) so that the ice maker 190c for ice-watered water is cooled using ice in the freezer and ice contained in the ice machine is stored. 195c may be further provided. In addition, although not shown in the drawing, an ice suit (not shown) that guides ice contained in the ice bank 195c to be dropped into the dispenser 160c may be further provided.

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

The display unit 230c displays information such as a control screen, an operating state, and a high internal temperature. For example, the display unit 230c may display a dispenser service type (each ice, water, or piece of ice), a set temperature of the freezer, and a set temperature of the refrigerator.

The display unit 230c may be implemented in various ways, such as a liquid crystal display (LCD), a light emitting diode (LED), or an organic light emitting diode (OLED). 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 a service type (ice cubes, water, crushed ice, etc.) of the dispenser, and a freezer temperature setting button (not shown) for setting the freezer temperature. And, it may include a refrigerator temperature setting button (not shown) for setting the freezer temperature. Meanwhile, the input unit 220c may be implemented as a touch screen capable of performing the function of the display unit 230c.

On the other hand, the refrigerator according to the embodiment of the present invention is not limited to the double door type (Double Door Type) shown in the drawing, and is a one door type (one door type), a sliding door type (sliding door type), a curtain door type (Curtain Door Type).

18 is a diagram briefly showing the configuration of the refrigerator of FIG. 17.

Referring to the drawings, the refrigerator 100c is supplied with a compressor 112c, a condenser 116c for condensing the refrigerant compressed in the compressor 112c, and a refrigerant condensed in the condenser 116c to evaporate, 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.

Meanwhile, in the drawings, one evaporator is used, but it is also possible to use each evaporator in the refrigerating compartment and the freezing compartment.

That is, the refrigerator 100c is a three-way valve that supplies the refrigerant condensed in the refrigerator evaporator (not shown) and the condenser 116c disposed in the refrigerator (not shown) to the refrigerator evaporator (not shown) or the freezer evaporator 124c. (Not shown) and a refrigerating compartment expansion valve (not shown) for expanding the refrigerant supplied to the refrigerating compartment evaporator (not shown) may be further included.

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 liquid and gas.

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

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

Meanwhile, according to the drawings, 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 a fan (not shown) is one evaporator. The generated cold air may be forcedly blown to be supplied to the freezing and refrigerating chambers.

The compressor 112c of FIG. 18 may be driven by a motor driving device, such as FIG. 1, which drives the compressor motor.

Alternatively, the refrigerator compartment fan (not shown) or the freezer compartment fan 144c may be driven by a motor drive device, such as FIG. 1, to drive the refrigerator compartment fan motor (not shown) and the freezer compartment fan motor (not shown), respectively. .

The motor driving apparatus and the home appliance having the same according to the exemplary embodiment of the present invention are not limited to the configuration and method of the exemplary embodiments described above, and the exemplary embodiments are provided so that various modifications can be made. All or some of the embodiments may be configured by selectively combining.

On the other hand, the motor driving method or the operation method of the home appliance of the present invention can be implemented as a code readable by the processor on a recording medium readable by a processor provided in the motor driving device or the home appliance. The processor-readable recording medium includes all types of recording devices in which data that can be read by the processor are stored.

In addition, although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention pertains without departing from the gist of the present invention claimed in the claims. In addition, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical idea or prospect of the present invention.

Claims (10)

A dc stage capacitor storing DC power;
A plurality of first to third upper arm switching elements and first to third lower arm switching elements are provided, and the switching operation converts the DC power stored in the DC terminal capacitor into AC power, and converts the converted AC power. An inverter outputting to the motor;
A dc stage resistor element disposed between the dc stage capacitor and the inverter;
An output current detector for detecting a current flowing in the dc terminal resistance element;
And an inverter control unit controlling the inverter based on the detected current.
The inverter control unit,
Depending on the diagnostic mode,
During a period in which only one switching element in the inverter is turned on, control is performed such that a plurality of upper and lower arm switching elements are sequentially turned on one by one,
During a period in which only one switching element in the inverter is turned on, according to sequential turn-on, when the level of the sequentially detected current is less than the first level, control is performed so that three switching elements are turned on in the inverter,
During the period in which only the three switching elements in the inverter are turned on, some of the first to third upper arm switching elements in the inverter and some of the first to third lower arm switching elements are turned on to turn 6 in the inverter. It is controlled such that only three of the switching elements are sequentially turned on,
During a period in which only three switching elements in the inverter are turned on, the first upper arm, the second lower arm, and the third lower arm switching element are turned on in the first period, and in the second period, the second upper arm, the first lower arm, The third lower arm switching element is turned on, and in the third period, the third upper arm, the first lower arm, and the second lower arm switching element is turned on, and in the fourth period, the second upper arm, the third upper arm, and the first lower arm switching element. On, in the fifth period, the first upper arm, the third upper arm, and the second lower arm switching element are turned on, and in the sixth period, the first upper arm, the second upper arm, and the third lower arm switching element are turned on,
During a period in which only three switching elements in the inverter are turned on, according to a sequential turn-on, when the level of the current sequentially detected is equal to or less than a second level greater than the first level, at least one of the three switching elements turned on The switching element is judged to be open,
During a period in which only three switching elements in the inverter are turned on, the level of the detected current is higher than the second level in a state where only the first phase-arm switching elements of the plurality of first to third phase-arm switching elements in the inverter are turned on. And a first lower arm switching element corresponding to the first upper arm switching element is determined as a short circuit when the level is greater than the third level. delete delete delete According to claim 1,
Further comprising; a temperature sensor for sensing the temperature around the motor,
The inverter control unit,
The lower the sensed temperature, the motor driving device characterized in that the control so that the turn-on period that only the one switching element is turned on becomes longer. delete According to claim 1,
Further comprising; a temperature sensor for sensing the temperature around the motor,
The inverter control unit,
The lower the sensed temperature, the motor drive device characterized in that the control so that the longer the turn-on period in which only the three switching elements are turned on. According to claim 1,
The inverter control unit,
The diagnostic mode, when driving the motor, characterized in that to control the motor to be performed before the motor alignment period. According to claim 1,
The inverter control unit,
A motor driving apparatus characterized in that, for turning on only the first phase-arm switching element in the inverter, a switching control signal of a fixed duty is output to the inverter. A home appliance comprising the motor drive of any one of claims 1, 5, 7-9.

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