KR102198184B1 - Motor driving apparatus and home appliance including the same - Google Patents

Abstract

The present invention relates to a motor drive device and a home appliance including the same. A motor driving apparatus according to an embodiment of the present invention includes a plurality of switching elements, an inverter that converts DC power of a DC single capacitor into AC power and outputs it to a motor by a switching operation, an inverter control unit that controls the inverter, An overcurrent detection unit for outputting a signal based on a current applied to the inverter and a gate driving unit for controlling on and off of the switching element based on the overcurrent detection signal, and the overcurrent detection unit has one end connected to a dc terminal capacitor, A first resistance element with the other end connected to the inverter, a second resistance element with one end connected to the other end of the first resistance element, a third resistance element with one end connected to the other end of the second resistance element, and the other end of the third resistance element It is connected and may include a voltage variable portion for varying the first voltage applied between the other end and the ground terminal of the third resistance element. Accordingly, by changing the level of the overcurrent detection signal, it is possible to protect the elements in the motor driving apparatus from overcurrent. In addition, various embodiments are possible.

Description

Motor driving apparatus and home appliance including the same TECHNICAL FIELD

The present invention relates to a motor driving apparatus and a home appliance having the same, and more particularly, a motor driving apparatus capable of protecting elements in a motor driving apparatus from overcurrent by changing the level of an overcurrent detection signal, and having the same It's all about home appliances.

A home appliance is a device used for user convenience. In addition, home appliances, such as air conditioners, washing machines, and refrigerators, used in predetermined spaces such as homes and offices each perform unique functions and operations according to user manipulation.

On the other hand, the motor driving device is a device for driving a motor having a rotor for rotating motion and a stator wound around a coil, and in particular, can be used to drive a motor in a home appliance. In order to stably drive such a motor driving device, an overcurrent protection circuit capable of protecting the inverter from the influence of overcurrent is required.

However, the conventional overcurrent protection circuit generally has a fixed criterion for determining the overcurrent, and thus, there is a problem that the criterion for determining the overcurrent cannot be changed even if the motor is replaced. In addition, the conventional overcurrent protection circuit, when a motor or the like is replaced, cannot protect an inverter, a motor, a gate driver, etc. from an overcurrent, and thus there is a problem in that the motor cannot be stably driven.

An object of the present invention is to provide a motor driving device and a home appliance including the same, which can protect elements in a motor driving device from overcurrent by changing the level of an overcurrent detection signal in response to motor replacement.

In order to achieve the above object, a motor driving apparatus according to an embodiment of the present invention includes an overcurrent detection unit that outputs an overcurrent detection signal to a gate driver based on a current applied to the inverter, and the overcurrent detection unit is output from the inverter control unit. A circuit configuration capable of changing the level of the overcurrent detection signal may be included by including a voltage variable unit that changes the voltage based on the signal.

In order to achieve the above object, a motor driving apparatus according to various embodiments of the present invention includes a plurality of switching elements, and an inverter that converts DC power of a DC terminal capacitor into AC power and outputs it to a motor by a switching operation. , An inverter control unit for controlling the inverter, an overcurrent detection unit for outputting a signal based on a current applied to the inverter, and a gate driving unit for controlling on and off of a switching element based on the overcurrent detection signal, and the overcurrent The detection unit includes a first resistance element having one end connected to the dc terminal capacitor and the other end connected to the inverter, a second resistance element having one end connected to the other end of the first resistance element, and one end of the second resistance element. A third resistive element connected to the other end and a voltage variable part connected to the other end of the third resistive element and varying a first voltage applied between the other end of the third resistive element and a ground terminal may be included.

In order to achieve the above object, a home appliance according to another embodiment of the present invention includes a plurality of switching elements, and an inverter that converts DC power of a DC terminal capacitor into AC power and outputs it to a motor by a switching operation, An inverter control unit for controlling the inverter, an overcurrent detection unit for outputting a signal based on a current applied to the inverter, and a gate driving unit for controlling on and off of a switching element based on the overcurrent detection signal, and the overcurrent detection unit Is, a first resistance element having one end connected to the dc terminal capacitor, the other end connected to the inverter, a second resistance element having one end connected to the other end of the first resistance element, and one end of the other end of the second resistance element A motor driving device including a third resistance element connected to and a voltage variable part connected to the other end of the third resistance element and for varying a first voltage applied between the other end of the third resistance element and a ground terminal. I can.

In the motor driving apparatus according to various embodiments of the present disclosure, since the level of the overcurrent detection signal can be changed, even when the motor is replaced, elements in the motor driving apparatus can be stably protected.

In addition, since the motor driving apparatus according to various embodiments of the present disclosure stops the inverter and the motor when an overcurrent is detected, it is possible to prevent demagnetization of the motor and damage to circuit elements due to the overcurrent.

In addition, the motor driving apparatus according to various embodiments of the present invention detects overcurrent based on a smaller value among the set values of overcurrent of the motor and the inverter, and thus prevents overcurrent conduction even when a motor having a smaller capacity compared to the inverter capacity is connected. can do.

In addition, the gate driver in the motor driving apparatus according to various embodiments of the present disclosure outputs an inverter stop signal to the inverter when an overcurrent is detected, and thus has the advantage of quick response to the overcurrent.

In addition, since the motor driving apparatus according to various embodiments of the present invention uses relatively simple circuit elements such as resistors, capacitors, and transistors, there is an advantage in that the implementation is easy.

In addition, since the motor driving apparatus according to various embodiments of the present disclosure changes the level of the overcurrent detection signal by controlling the duty ratio of the signal applied to the transistor element, the level of the overcurrent detection signal can be linearly changed.

In addition, since the motor driving apparatus according to various embodiments of the present invention includes a resistance element and/or a capacitor for removing noise, unnecessary malfunction due to a noise signal can be prevented.

In the home appliance according to another embodiment of the present invention, since the level of the overcurrent detection signal can be changed, even when the motor is replaced, elements in the motor driving apparatus can be stably protected.

1 is an internal block diagram of a motor driving apparatus according to an embodiment of the present invention.
2 is an internal circuit diagram of a motor driving apparatus according to an embodiment of the present invention.
3 is an internal block diagram of an inverter control unit according to an embodiment of the present invention.
4 is a flowchart illustrating a method of operating a motor driving apparatus according to an embodiment of the present invention.
5A is an exemplary view showing an operation of a motor driving apparatus according to an embodiment of the present invention, and FIG. 5B is a graph showing a voltage changed by a voltage variable unit according to an embodiment of the present invention, and FIG. 5C Is a circuit diagram referenced for describing the operation of a motor driving apparatus according to an embodiment of the present invention, and FIG. 5D is a graph illustrating overcurrent detection according to a change in the level of the overcurrent detection signal according to an embodiment of the present invention to be.
6 is a diagram illustrating a configuration of an air conditioner that is an example of a home appliance according to an embodiment of the present invention.
7 is a schematic diagram of the outdoor unit and the indoor unit of FIG. 6 according to an embodiment of the present invention.
8 is a perspective view showing a laundry treatment device that is another example of a home appliance according to an embodiment of the present invention.
9 is an internal block diagram of the laundry treatment apparatus of FIG. 8 according to an embodiment of the present invention.
10 is a perspective view illustrating a refrigerator, which is another example of a home appliance according to an embodiment of the present invention.
11 is a diagram schematically showing the configuration of the refrigerator of FIG. 10 according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings. In the drawings, in order to clearly and briefly describe the present invention, the illustration of parts not related to the description is omitted, and the same reference numerals are used for identical or extremely similar parts throughout the specification.

The suffixes "module" and "unit" for the constituent elements used in the following description are given in consideration of only the ease of writing in the present specification, and do not impart a particularly important meaning or role by themselves. Therefore, the "module" and "unit" may be used interchangeably with each other.

In the present application, terms such as "comprises" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or additional possibility of additions or numbers, steps, actions, components, parts, or combinations thereof, is not preliminarily excluded.

In addition, in this specification, terms such as first and second may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

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

1 and 2, a motor driving apparatus 220 according to various embodiments of the present invention includes an overcurrent detection unit 410, an inverter 420, a gate driving unit 430, an inverter control unit 440, and a memory. 450), a motor 230 and/or a load 231 may be included.

The motor driving apparatus 220 according to an embodiment of the present invention may further include a converter 450 that converts the input AC power 405 to DC power and outputs it.

The motor driving device 220 according to an embodiment of the present invention includes an input current detection unit (A), a reactor (not shown), a dc terminal capacitor (C), a dc terminal voltage detection unit (B), and an output current detection unit (E). It may further include.

The overcurrent detection unit 410 may output an overcurrent detection signal Scd to the gate driver 430 based on, for example, a current value of a current applied to the inverter 420.

The gate driver 430 may output an inverter stop signal Ss to the inverter 420 when the overcurrent detection signal Scd received from the overcurrent detection unit 410 is greater than or equal to a preset value.

The inverter 420 may include, for example, a plurality of inverter switching elements, and may output DC power to the motor 230 based on a signal received from the gate driver 430. The motor 230 may include, for example, a three-phase synchronous motor.

The reactor, for example, is disposed between the input AC power source 405 and the converter 450 to perform power factor correction or boosting operation. In addition, the reactor may perform a function of limiting harmonic current by high-speed switching such as a converter.

The input current detection unit A can detect, for example, an input current is input from the commercial AC power supply 405. The input current detection unit A is, for example, an input current detection unit A, and may include a current transformer (CT), a shunt resistor, and the like. The detected input current is, for example, as a discrete signal in the form of a pulse, and may be input to the inverter controller 440.

The converter 450, for example, may change the commercial AC power 405 to a DC power and output it to a DC terminal. In the drawings, the commercial AC power source 405 is shown as a single-phase AC power source, but the present invention is not limited thereto, and may be a three-phase AC power source, and the internal structure of the converter 450 according to the type of the commercial AC power source 405 It can also be different.

Meanwhile, the converter 450 may be made of, for example, a diode without a switching element, and may perform a rectification operation without a separate switching operation. For example, when the commercial AC power source 405 is a single-phase AC power source, four diodes may be provided in a bridge form, and when the commercial AC power source 405 is a three-phase AC power source, six diodes are provided in a bridge form. Can be.

Meanwhile, as the converter 450, for example, a half-bridge converter in which two switching elements and four diodes are connected may be used. As for the converter 450, for example, when the commercial AC power source 405 is a three-phase AC power source, 6 switching elements and 6 diodes may be used. In this case, the converter 450 may be referred to as a rectifier.

When the converter 450 includes, for example, a switching element, a step-up operation, power factor improvement, and DC power change may be performed by a switching operation of the switching element.

The dc terminal capacitor C is, for example, connected to both ends of dc, smoothing the input power and storing it. In the drawings, a single device is shown as a dc-stage capacitor C, but the present invention is not limited thereto, and a plurality of devices are provided to ensure device stability.

Meanwhile, in the drawings, the dc terminal capacitor C is shown to be connected to the output terminal of the converter 450, but the present invention is not limited thereto, and may be directly connected to a DC power supply. For example, direct current power from a solar cell may be directly input to the dc terminal capacitor C or may be input by varying DC/DC. In the following, the parts illustrated in the drawings will be mainly described.

Meanwhile, since DC power is stored at both ends of the DC terminal capacitor C, for example, it may be referred to as a dc terminal or a dc link terminal.

The dc terminal voltage detector B may detect, for example, the dc terminal voltage Vdc, which is both ends of the dc terminal capacitor C. To this end, the dc terminal voltage detection unit B may include a resistance element, an amplifier, and the like. The detected dc terminal voltage Vdc is, for example, a discrete signal in the form of a pulse and may be input to the inverter controller 440.

The inverter 420 may change the DC power (Vdc) smoothed by the on/off operation of the inverter switching element into a three-phase AC power source (va, vb, vc) having a predetermined frequency and output it to the motor 230. .

For example, upper-arm switching elements (Sa, Sb, Sc) and lower-arm switching elements (S'a, S'b, S'c) may be connected in series to each other to form a pair, and the inverter 420 A total of three pairs of upper and lower arm switching elements (Sa&S'a, Sb&S'b, and Sc&S'c) connected in parallel may be included. To each of the switching elements Sa, S'a, Sb, S'b, Sc, S'c, for example, a diode may be connected in reverse parallel.

The inverter 420 may control an on/off operation of each inverter switching element based on, for example, an inverter switching control signal Sic output from the inverter controller 440. In more detail, the inverter controller 440 may output, for example, a switching control signal Sic to the gate driver 430. The gate driver 430 may output the inverter switching signal Si to the inverter 420, for example, when receiving the switching control signal Sic from the inverter controller 440.

Meanwhile, the motor driving apparatus 220 according to various embodiments of the present disclosure may further include a voltage step-down unit (not shown). The voltage step-down unit may supply, for example, a gate driving voltage for operation of the inverter switching elements of the inverter 420 to the gate driving unit 430.

The voltage step-down unit 470 includes, for example, an AC-DC variable device such as a switched-mode power supply (SMPS) using a high-frequency transformer or a non-insulated step-down type buck converter. Can include.

The inverter controller 440 may control a switching operation of the inverter 420 based on, for example, a sensorless method. To this end, the inverter control unit 440 may receive, for example, an output current io detected by the output current detection unit E.

The inverter controller 440 may output an inverter switching control signal Sic to the gate driver 430 in order to control a switching operation of the inverter 420, for example. In this case, the inverter switching control signal Sic may be, for example, a control signal of a pulse width modulation (PWM) having a predetermined duty cycle and frequency, and the output current detection unit E It may be generated based on the detected output current io.

The output current detection unit E may detect, for example, an output current io flowing between the motors 230.

The output current detection unit E may be disposed between the inverter 420 and the motor 230 in order to detect, for example, a current flowing through the motor 230.

The output current detection unit E may be provided with, for example, three resistance elements. The output current detector E may detect, for example, a phase current (ia, ib, ic) that is an output current io flowing through the motor 230 through three resistance elements. The detected output currents (ia, ib, ic) are discrete signals in the form of pulses and may be applied to the inverter control unit 440, and based on the detected output currents (ia, ib, ic), the inverter switching control signal ( Sic) can be created.

Meanwhile, in the present specification, ia, ib, ic, or io are mixed and used as the output current.

On the other hand, unlike the drawings, the output current detection unit E may include, for example, two resistance elements. At this time, the phase current of the remaining one phase may be calculated using a three-phase equilibrium.

Meanwhile, unlike the drawings, the output current detection unit E may be disposed between, for example, the dc terminal capacitor C and the inverter 420. The output current detection unit E may be provided with, for example, one shunt resistance element Rs, and may detect a current flowing through the motor 230. This method can be referred to as a one shunt method.

According to the one shunt method, the output current detection unit E can use, for example, one shunt resistor element Rs. In this case, when the lower arm switching element of the inverter 420 is turned on, a phase current that is an output current idc flowing through the motor 230 may be detected by time division.

The detected output current io may be input to the inverter controller 440 as, for example, a discrete signal in the form of a pulse. In this case, the inverter controller 440 may generate an inverter switching control signal Sic based on the input output current io, for example.

On the other hand, the motor 230 includes a stator and a rotor, and AC power of each phase of a predetermined frequency is applied to the coil of the stator of each phase (a, b, c phase) so that the rotor rotates. can do.

The motor 230 is, for example, a Surface-Mounted Permanent-Magnet Synchronous Motor (SMPMSM), a built-in permanent magnet synchronous motor (Interidcr Permanent Magnet Synchronous Motor; IPMSM), and synchronous reluctance. It may include a Synchronous Reluctance Motor (Synrm) or the like. Among them, SMPMSM and IPMSM are Permanent Magnet Synchronous Motor (PMSM), and Synrm is characterized by no permanent magnet.

The overcurrent detection unit 410 may include, for example, first to third resistance elements R1 to R3 and a voltage variable unit 411. The overcurrent detection unit 410 may detect, for example, a current applied to the inverter 420.

The first resistance element R1 may have one end connected to the dc terminal capacitor C, and the other end connected to the inverter 420, for example. For example, when a current is applied to the first resistance element R1, a voltage (V1 in FIG. 2, hereinafter the first voltage) may be generated at a node to which the inverter 420 and the first resistance element R1 are connected, and , The overcurrent detection unit 410 may detect whether the current applied to the inverter 420 is an overcurrent based on the first voltage value. Accordingly, the remaining components except for the first resistance element R1 may be referred to as the overcurrent detection unit 410.

One end of the second resistance element R2 may be electrically connected to, for example, a node V1 to which the inverter 420 and the first resistance element R1 are connected.

One end of the third resistance element R3 may be connected to, for example, the other end of the second resistance element R2, and the other end of the third resistance element R3 may be connected to the voltage variable part 411.

The voltage variable part 411 may change, for example, a voltage of a node connected to the third resistance element R3 (V3 in FIG. 2, hereinafter, a third voltage).

The voltage variable part 411 may include, for example, a capacitor element C1, fourth and fifth resistance elements, and a transistor element TR.

The capacitor element C1 may be connected between, for example, the other end of the third resistance element R3 and the ground terminal.

One end of the fourth resistance element R4 may be connected to the other end of the third resistance element R3, for example.

For example, a reference voltage may be input to one end of the fifth resistive element R5, and the other end of the fifth resistive element R5 may be connected to the other end of the fourth resistive element R4. In this case, the reference voltage may mean, for example, a voltage having a preset constant voltage value.

The transistor element TR may be connected between, for example, the other end of the fourth resistance element and the ground terminal. The transistor element TR may receive, for example, a voltage variable signal Svv output from the inverter controller 440. In this case, according to the voltage variable signal Svv, the current flowing through the transistor element TR may be changed, and accordingly, the third voltage V3 may be changed. Meanwhile, the voltage variable signal Svv may be a PWM signal.

Meanwhile, the transistor element TR may be, for example, a bipolar junction transistor (BJT) or a field effect transistor (FET). For example, when the transistor element TR is a bipolar junction transistor, the inverter controller 440 may output the voltage variable signal Svv to the base terminal of the transistor element TR. For example, when the transistor element TR is a field effect transistor, the inverter controller 440 may output the voltage variable signal Svv to the gate terminal of the transistor element TR. Meanwhile, the voltage variable signal Svv may be, for example, a PWM-type base input current or a gate input voltage.

The voltage variable unit 411 may further include a sixth resistance element Rb for removing noise between a node and a ground terminal between the inverter control unit 440 and the transistor element TR. . For example, the voltage variable signal Svv may be a PWM signal, and the sixth resistance element Rb causes a noise current due to switching to flow through the ground terminal, so that a noise current is generated in the voltage variable unit 411 It can be prevented from entering. Accordingly, the motor driving apparatus 220 can prevent unnecessary malfunctions, such as turning on the transistor element TR due to input of a noise signal.

The voltage variable part 411 may further include, for example, a capacitor element C2 connected between one end of the third resistance element R3 and a ground terminal. The capacitor element C2 may remove a harmonic component or delay the input time of the overcurrent detection signal Scd.

The overcurrent detection unit 410 may detect, for example, an overcurrent applied to the inverter 420 and output the overcurrent detection signal Scd to the gate driver 430. In this case, the overcurrent detection signal Scd may be, for example, a voltage value of the second voltage V2.

The gate driver 430 may control on or off of the switching element, for example, based on the overcurrent detection signal Scd. For example, the gate driver 430 may control on/off of the switching element based on the second voltage V2.

When the overcurrent detection signal Scd is greater than or equal to a preset value, the gate driver 430 may output an inverter stop signal Ss to the inverter 420 to stop driving the inverter 420. For example, the gate driver 430 may output an inverter stop signal Ss to the inverter 420 when the second voltage V2 is equal to or greater than a preset voltage.

Meanwhile, the overcurrent may mean the maximum current that the inverter 420 and the motor 230 can allow, and the preset value is the capacity, rated current, and switching of the inverter 420 and/or motor 230 It may be set in consideration of the breakdown voltage of the elements. Accordingly, hereinafter, the preset value may be referred to as an overcurrent reference value, a reference level of the overcurrent detection signal Scd, and the like.

Meanwhile, as described above, the gate driver 430 may output the inverter switching signal Si to the inverter 420, for example, when receiving a switching control signal Sic from the inverter controller 440. Thus, it is possible to control the on/off operation of the switching element in the inverter 420.

However, when the overcurrent detection signal Scd is equal to or greater than a preset value, the gate driver 430 transmits the inverter stop signal Ss to the inverter 420 in preference to the switching control signal Sic of the inverter controller 440. Can be printed. For example, when the second voltage V2 is greater than or equal to a preset voltage, the gate driver 430 may transmit the inverter stop signal Ss to the inverter 420 in preference to the switching control signal Sic of the inverter controller 440. ) Can be printed.

According to an embodiment of the present invention, the motor driving apparatus 220 may further include a memory 450.

The memory 450 may store, for example, information on a duty ratio of a signal applied to a transistor device. For example, the duty ratio may be stored in the memory 450 in the form of a look-up table.

The inverter controller 440 may determine, for example, a duty ratio of the voltage variable signal Svv, and may generate the voltage variable signal Svv based on the determined duty ratio.

The inverter controller 440 may change a voltage value of the third voltage V3 by controlling a signal applied to the transistor device based on, for example, a duty ratio stored in the memory 450. In this case, the duty ratio may be a value between 0 and 1.

The inverter controller 440 may compare, for example, an overcurrent set value of the motor 230 and an overcurrent set value of the inverter 420, and may determine a duty ratio based on the comparison result. In this case, the overcurrent setting value of the motor 230 and the overcurrent setting value of the inverter 420 may be stored in, for example, the memory 450. Here, the overcurrent setting value may mean a maximum value of current that can be applied to each circuit element to protect the circuit elements from overcurrent, for example. The overcurrent setting value may be, for example, a value equal to or smaller than the rated current value.

Meanwhile, the overcurrent setting value of the motor 230 and the overcurrent setting value of the inverter 420 may be changed according to, for example, a user's setting. For example, the inverter controller 440 may determine a smaller value of the overcurrent setting value of the motor 230 and the overcurrent setting value of the inverter 420 as the total overcurrent setting value. Also, the inverter controller 440 may determine a duty ratio based on, for example, the determined total overcurrent setting value, and control a signal applied to the transistor element based on the determined duty ratio. Meanwhile, for example, the duty ratio according to the total overcurrent setting value may be calculated by the inverter control unit 440 according to a predetermined calculation formula, or may be stored in the memory 450.

Meanwhile, in FIG. 1, the inverter control unit 440 and the memory 450 are shown as being separated and provided in the motor driving device 220, but the present invention is not limited thereto, and the inverter control unit 440 and the memory 450 ) May be provided in the motor driving device 220 in one configuration.

Meanwhile, the motor driving apparatus 220 according to various embodiments of the present disclosure may further include a display unit (not shown), and may display whether an error occurs due to an overcurrent through a predetermined display unit. The display unit may include, for example, a device that outputs numbers, characters, special characters, or images.

3 is an internal block diagram of an inverter control unit according to an embodiment of the present invention.

Referring to FIG. 3, the inverter control unit 440 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 receive, for example, three-phase output currents (ia, ib, ic) detected by the output current detection unit E, and convert them into two-phase currents (iα, iβ) of the stationary coordinate system. have.

Meanwhile, the axis conversion unit 310 may convert, for example, the two-phase currents iα and iβ in the stationary coordinate system into the two-phase currents id and iq in the rotation coordinate system.

)와 연산된 속도(

)를 출력할 수 있다.The speed calculation unit 320, for example, based on the two-phase currents (iα, iβ) of the stationary coordinate system axis-changed in the axis conversion unit 310, the calculated position (

) And calculated speed (

) Can be printed.

)와 속도 지령치(ω^* _r)에 기초하여, 전류 지령치(i^* _q)를 생성할 수 있다. 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 도시하나, 본 발명이 이에 한정되는 것은 아니며, d축 전류 지령치(i^* _d)를 함께 생성할 수도 있다. 한편, d축 전류 지령치(i^* _d)의 값은 0으로 설정될 수도 있다. On the other hand, the current command generation unit 330, for example, the calculation speed (

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

) And the speed command value (ω ^* _r ), PI control is performed in the PI controller 335 and a current command value (i ^* _q ) can be generated. In the drawings, the q-axis current command value (i ^* _q ) is shown as the current command value, but the present invention is not limited thereto, and the d-axis current command value (i ^* _d ) may be generated 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, for example, a limiter (not shown) that limits its level so that the current command value i ^* _q does not exceed an allowable range.

Next, the voltage command generation unit 340 is, for example, in the d-axis and q-axis currents (i _d , i _q ) and the current command generation unit 330 that are axis-transformed from the axis conversion unit to a two-phase rotation coordinate system Based on the current command values (i ^* _d , i ^* _q ) of, d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) can be 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 ), and q It is possible to generate the axis voltage command value (v ^* _q ). Further, the voltage command generation unit 340 performs PI control in the PI controller 348 based on, for example, a difference between the d-axis current (i _d ) and the d-axis current command value (i ^* _d ), and , d-axis voltage command value (v ^* _d ) can be generated. Meanwhile, the voltage command generation unit 340 may further include a limiter for limiting the level of the d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) not exceeding the allowable range. .

Meanwhile, the generated d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) may be input to, for example, the axis conversion unit 350.

)와, d축, q축 전압 지령치(v^* _d, v^* _q)를 입력받아, 축변환을 수행할 수 있다.The axis conversion unit 350 is, for example, a position calculated by the speed calculation unit 320 (

), and d-axis and q-axis voltage command values (v ^* _d , v ^* _q ), and axis transformation can be performed.

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

) Can be used.

In addition, the axis conversion unit 350 may perform conversion from a 2-phase stationary coordinate system to a 3-phase stationary coordinate system. Through this conversion, the axis conversion unit 350 may output a three-phase output voltage command value (v ^* a, v ^* b, v ^* c).

The switching control signal output unit 360, for example, based on the three-phase output voltage command value (v ^* a, v ^* b, v ^* c) for the inverter switching control signal (Sic) according to the pulse width modulation method You can create and print it.

The inverter switching control signal Sic may be converted into an inverter switching signal Si in the gate driver 430 and input to the gates of each switching element in the inverter 220. For example, each switching element (Sa, S'a, Sb, S'b, Sc, S'c) provided in the inverter 220 may perform a switching operation by the inverter switching signal Si. .

4 is a flowchart illustrating a method of operating a motor driving apparatus according to an embodiment of the present invention.

4, the inverter control unit 440 of the motor driving apparatus 220 according to an embodiment of the present invention, in operation S410, the overcurrent set value of the motor 230 and the overcurrent set value of the inverter 420 Can be compared. The inverter controller 440 may compare an overcurrent setting value of the motor 230 stored in the motor driving device 220 and an overcurrent setting value of the inverter 420. Meanwhile, the overcurrent setting value of the motor 230 and/or the overcurrent setting value of the inverter 420 may be changed according to a user's setting, for example. For example, when the user changes the motor 230, the user may change the overcurrent setting value of the motor 230 stored in the motor driving device 220.

In operation S420, the inverter controller 440 may compare the overcurrent set value of the motor 230 and the overcurrent set value of the inverter 420, and may determine a smaller value of the two overcurrent set values.

In operation S430, when the overcurrent set value of the motor 230 is smaller than the overcurrent set value of the inverter 420, the inverter control unit 440 determines the overcurrent set value of the motor 230 as a basis for the generation of the duty ratio. It can be determined by setting value.

The inverter control unit 440, in operation S440, when the overcurrent set value of the motor 230 is greater than the overcurrent set value of the inverter 420, sets the overcurrent set value of the inverter 420 to the total overcurrent which is the basis of the duty ratio. Can be determined by value.

In operation S450, the inverter controller 440 may determine the duty ratio based on the total overcurrent set value determined in operation S440. In addition, the inverter controller 440 may generate a voltage variable signal Svv based on the determined duty ratio and may output the generated voltage variable signal Svv to the voltage variable unit 410. Meanwhile, the voltage variable signal Svv may be, for example, a signal of a pulse width modulation method for changing a base input current or a gate input voltage.

Meanwhile, the duty ratio determined according to the total overcurrent setting value may be calculated by the inverter controller 440 according to, for example, a predetermined calculation formula, or may be stored in the memory 450.

Accordingly, the motor driving device 220 can change the level of the voltage variable signal Svv and the overcurrent detection signal Scd based on the overcurrent setting values of the motor 230 and the inverter 420 provided, so that the motor is replaced. Even at the time, the elements in the motor driving device 220 can be stably protected.

In addition, there is an advantage that it is easy to implement by using relatively simple circuit elements such as resistors and transistors.

5A is an exemplary view showing an operation of a motor driving apparatus according to an embodiment of the present invention, and FIG. 5B is a graph showing a voltage varied by a voltage variable unit according to an embodiment of the present invention, and FIG. 5C is a circuit diagram referenced for explaining the operation of the motor driving apparatus according to an embodiment of the present invention, and FIG. 5D is a diagram illustrating overcurrent detection according to a change in the level of the overcurrent detection signal according to an embodiment of the present invention. It is a graph.

Referring to FIG. 5A, the first upper arm switching element Sa of the inverter 420 is turned on, the second and third upper arm switching elements Sb and Sc are turned off, and the first lower arm switching element S'a Is turned off, and when the second and third lower arm switching elements S'b and S'c are turned on, the current applied to the inverter 420 is the switching elements provided in the inverter 420 and the motor ( 230), it can be applied to the V1 node. 5A illustrates a first current path (path 1).

The current applied to the inverter 420 may be branched at the node V1 and partially applied to the first resistance element R1. In FIG. 5A, the second current path Path 2 is illustrated.

The current applied to the inverter 420 diverges from the node V1, and the second resistance element R2, the third resistance element R3, the fourth resistance element R4, the fifth resistance element R5, and the transistor element The rest of it may be licensed to (TR). In FIG. 5A, a third current path Path 3 is illustrated.

Referring to FIG. 5B, the inverter controller 440 may output a voltage variable signal Svv to the voltage variable unit 411. The voltage variable signal Svv may be, for example, a control signal of a pulse width modulation scheme (PWM) having a predetermined duty ratio and frequency. The current flowing through the transistor element TR provided in the voltage variable part 411 may be changed according to the voltage variable signal Svv, and accordingly, the third voltage V3 may be changed.

Meanwhile, the inverter control unit 440 may increase the duty ratio as shown in FIG. 5B, and output the voltage variable signal Svv according to the increased duty ratio to the voltage variable unit 411 to generate the third voltage V3. Can increase. For example, when the duty ratio increases, the current flowing through the transistor element TR may increase, and accordingly, the third voltage V3 may increase.

Meanwhile, when the third voltage V3 is changed, the second voltage V2 may be changed, and as a result, the overcurrent detection signal Scd may be changed. In more detail, it will be described based on FIG. 5C and Equation 1 below.

In the circuit diagram and Equation 1 of FIG. 5C, I1 is a current applied to the node V1, and the third voltage V3 is a voltage value changed by the voltage variable unit 411. That is, the second voltage V2, which is the voltage of the node to which the overcurrent detection unit 410 and the gate driver 430 are connected, may be changed as the value of I1 and/or the value of the third voltage V3 is changed. On the other hand, when the replaced motor 430 is a motor having a capacity smaller than that of the inverter 420, the maximum allowable current value may be lower than that of the motor before replacement. Accordingly, by changing the level of the overcurrent detection signal based on the overcurrent setting value of the replaced motor 430, it is necessary to prevent the demagnetization of the motor 430 and damage to the circuit element due to the overcurrent.

Referring to FIG. 5D, the graph of FIG. 5D displays a level change of an overcurrent detection signal according to a change in a value of the third voltage V3. The gate driver 430 may output the inverter stop signal Ss to the inverter 420, for example, when the overcurrent detection signal Scd is equal to or greater than a preset value. That is, the gate driver 430 may output the inverter stop signal Ss to the inverter 420 when the second voltage V2, which is the voltage of the node connected to the overcurrent detection unit 410, is greater than or equal to a preset value. have. For example, when the value of the third voltage V3 is 0V and the value of I1 is 18A or more, the second voltage V2 is a preset value of 0.45V or more, and the gate driver 430 generates an overcurrent detection signal ( Scd) can be output. On the other hand, when the value of the third voltage V3 is changed to 0.06V by the voltage variable unit 411, when the value of I1 is 16A or more, the value of the second voltage V2 is 0.45V or more. The 430 may output an overcurrent detection signal Scd. That is, when the value of the third voltage V3 is increased by the voltage variable unit 411, even if the value of the current I1 applied to the inverter 420 is smaller than before, the overcurrent detection signal Scd is generated by the gate driver 430 Since it is output from, it is possible to prevent demagnetization of the motor 430 and damage to circuit elements due to overcurrent.

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

Referring to FIG. 6, an air conditioner 100b according to an embodiment of the present invention may include an indoor unit 31b and an outdoor unit 21b connected to the indoor unit 31b.

The indoor unit 31b of the air conditioner can be applied to any of, for example, a stand type air conditioner, a wall-mounted type air conditioner, and a ceiling type air conditioner, but in the drawing, the stand type indoor unit 31b is illustrated. do.

Meanwhile, the air conditioner 100b may further include at least one of, for example, 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 includes, for example, a compressor (not shown) that receives and compresses a refrigerant, an outdoor heat exchanger (not shown) that heats the refrigerant and outdoor air, and extracts gaseous refrigerant from the supplied refrigerant to the compressor. It may include a supply accumulator (not shown) 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, oil collectors, and the like are further included, but a description of the configuration thereof will be omitted below.

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

In this case, the outdoor unit 21b may supply the compressed refrigerant to the connected indoor unit 310b, for example.

The indoor unit 31b may receive a refrigerant from the outdoor unit 21b and discharge hot and cold air into the room, for example. The indoor unit 31b may include, for example, an indoor heat exchanger (not shown), an indoor unit fan (not shown), an expansion valve (not shown) through which the supplied refrigerant is expanded, and a plurality of sensors (not shown). I can.

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

A remote control (not shown) may be connected to the indoor unit 31b, input a user's control command to the indoor unit 31b, and receive and display status information of the indoor unit 31b. In this case, the remote control may communicate by wire or wirelessly according to a connection type with the indoor unit 31b.

7 is a schematic diagram of the outdoor unit and the indoor unit of FIG. 6 according to an embodiment of the present invention.

Referring to FIG. 6, the air conditioner 100b according to an embodiment of the present invention can be largely divided into an indoor unit 31b and an outdoor unit 21b.

The outdoor unit 21b includes, for example, a compressor 102b serving to compress a refrigerant, a compressor motor 102bb driving the compressor 102b, and an outdoor heat exchanger serving to heat the compressed refrigerant. An outdoor blower 105b composed of a device 104b, an outdoor fan 105ab that is disposed on one side of the outdoor heat exchanger 104b to promote heat dissipation of refrigerant, and an electric motor 105bb that rotates the outdoor fan 105ab, The expansion mechanism 106b for expanding the condensed refrigerant, the cooling/heating switching valve 110b for changing the flow path of the compressed refrigerant, and the refrigerant at a constant pressure are compressed after removing moisture and foreign substances by temporarily storing the gasified refrigerant. It may include an accumulator (103b), etc. supplied to.

The indoor unit 31b includes, for example, an indoor heat exchanger 108b disposed indoors to perform a cooling/heating function, and an indoor fan disposed at one side of the indoor heat exchanger 108b to promote heat dissipation of a refrigerant. It may include an indoor blower 109b including an electric motor 109bb that rotates 109ab and the indoor fan 109ab.

At least one indoor heat exchanger 108b may be installed, for example. The compressor 102b may be, for example, 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, for example, or may be configured with a heat pump that cools or heats the room.

The compressor 102b in the outdoor unit 21b of FIG. 6 may be driven by a motor driving device 220, as shown in FIG. 2, which drives the compressor motor 250b.

Alternatively, the indoor fan 109ab or the outdoor fan 105ab is, for example, driven by an indoor fan motor 109bb and an outdoor fan motor 150bb, respectively, by a motor driving device 220 as shown in FIG. Can be driven.

8 is a perspective view showing a laundry treatment device that is another example of a home appliance according to an embodiment of the present invention.

Referring to FIG. 8, the laundry treatment device 100a according to an embodiment of the present invention may be a laundry treatment device of a front load type in which a carriage is inserted into a washing tub in a front direction. Such a front-type laundry treatment device is a concept including, for example, a washing machine in which a cloth is inserted to perform washing, rinsing and dehydration, or a dryer in which a wet cloth is inserted to perform drying, and the like will be described below. .

The laundry treatment device 100a of FIG. 8 is, for example, a laundry bath laundry treatment device, and is disposed inside the cabinet 110 and the cabinet 110 forming the exterior of the laundry treatment device 100a. ) Supported by the tub 120, the washing tub 122 disposed inside the tub 120 and in which the cloth is washed, the motor 130 driving the washing tub 122, and the cabinet body 111 A washing water supply device (not shown) for supplying washing water into the cabinet 110 and a drainage device (not shown) formed under the tub 120 to discharge washing water to the outside may be included.

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

The cabinet 110 is, for example, a cabinet body 111, a cabinet cover 112 disposed on and coupled to the front of the cabinet body 111, and is disposed above the cabinet cover 112, and the cabinet body 111 A control panel 115 coupled to the control panel 115 and a top plate 116 disposed above the control panel 115 and coupled to the cabinet body 111 may be included.

The cabinet cover 112 includes, for example, a fabric entry hole 114 formed to allow the fabric to enter and exit, and a door 113 disposed to be rotatable left and right so that the fabric entry hole 114 can be opened and closed. Can include.

The control panel 115, for example, is disposed on one side of the operation keys 117 and operation keys 117 to manipulate the operation state of the laundry treatment machine (100a) and controls the operation state of the laundry treatment machine (100a). It may include a display device 118 to display.

The operation keys 117 and the display device 118 in the control panel 115 are electrically connected to, for example, a control unit (not shown), and the control unit is electrically connected to each component of the laundry treatment device 100a. Can be controlled. The operation of the control unit will be described later.

On the other hand, in the washing tub 122, for example, an auto balance (not shown) may be provided. The auto balance is for reducing vibrations generated according to the amount of eccentricity of laundry accommodated in the washing tub 122, and may be implemented as a liquid balance or a ball balance.

Meanwhile, although not shown in the drawings, the laundry treatment device 100a may further include, for example, a vibration sensor that measures the amount of vibration of the washing tub 122 or the amount of vibration of the cabinet 110.

9 is an internal block diagram of the laundry treatment apparatus of FIG. 8 according to an embodiment of the present invention.

9, the laundry treatment device (100a), for example, by a control operation of the control unit 210, the driving unit 220 can be controlled, the driving unit 220 to drive the motor 230 I can. Accordingly, the washing tub 122 may be rotated by, for example, the motor 230.

The control unit 210 may perform an operation by receiving an operation signal from the operation key 1017, for example. Accordingly, washing, rinsing, and spin-drying processes may be performed.

In addition, the controller 210 may control the display 18 to display, for example, a washing course, a washing time, a spinning time, a rinsing time, or a current operating state.

Meanwhile, the control unit 210 may control the driving unit 220 to control the driving unit 220 to operate the motor 230, for example. In this case, a position detection unit for detecting the rotor position of the motor may not be provided inside or outside the motor 230. That is, the driving unit 220 may control the motor 230 by a sensorless method.

The driving unit 220 is for driving the motor 230, for example, an inverter (not shown), an inverter control unit (not shown), and an output current detection unit (Fig. 2E) and an output voltage detector (not shown) 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 440 of FIG. 2 in the driving unit 220 may estimate the position of the rotor of the motor 230 based on the output current idc and the output voltage vo. In addition, the inverter control unit (440 of FIG. 2) in the driving unit 220 may control the motor 230 to rotate based on the estimated rotor position.

Specifically, the inverter control unit (440 in FIG. 2) generates a pulse width modulation (PWM) switching control signal (Sic in FIG. 2) based on the output current (idc) and the output voltage (vo), When output as (not shown), the inverter performs a high-speed switching operation and can supply AC power of a predetermined frequency to the motor 230. Then, the motor 230 can be rotated by an AC power source having a predetermined frequency.

Meanwhile, the driving unit 220 may correspond to, for example, the motor driving apparatus 220 of FIG. 2.

Meanwhile, the control unit 210 may detect the amount of fabric based on, for example, an output current idc flowing through the motor 230. For example, while the washing tub 122 is rotating, the amount of cloth may be sensed based on the current value idc of the motor 230.

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

Meanwhile, the control unit 210 may detect, for example, an eccentric amount of the washing tub 122, that is, an unbalance (UB) of the washing tub 122. The detection of the amount of eccentricity may be performed based on a ripple component of the output current idc flowing through the motor 230 or a change in the rotational speed of the washing tub 122.

In particular, the control unit 210 may accurately detect the amount of eccentricity by using the stator resistance and the inductance value of the motor measured in the motor alignment section, for example, when detecting the bag amount.

10 is a perspective view illustrating a refrigerator, which is another example of a home appliance according to an embodiment of the present invention.

Referring to FIG. 10, the refrigerator 100c according to the present invention, although not shown, shields a case 110c having an internal space divided into a freezing chamber and a refrigerating chamber, and a freezing chamber door 120c and a refrigerating chamber shielding the freezing chamber. A schematic appearance may be formed by the refrigerating compartment door 140c.

Further, a door handle 121c protruding forward is further provided on the front of the freezer door 120c and the refrigerator door 140c, so that the user can easily grip and rotate the freezer door 120c and the refrigerator door 140c. I can make it.

On the other hand, on the front of the refrigerating compartment door 140c, for example, a home bar 180c, which is a convenience means for allowing the user to take out storage such as beverages accommodated therein without opening the refrigerating compartment door 140c, is further provided. It can be provided.

And, on the front of the freezing compartment door (120c), for example, a dispenser (160c), which is a convenience means that allows a user to easily take out ice or drinking water without opening the freezing compartment door (120c) may be provided, Above the dispenser 160c, a control panel 210c may be further provided to control a driving operation of the refrigerator 100c and show a state of the refrigerator 100c in operation on the screen.

Meanwhile, in the drawings, the dispenser 160c is shown to be disposed on the front side of the freezing 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, on the inner upper part of the freezing chamber (not shown), for example, an ice maker 190c that ices water supplied by using cold air in the freezing chamber, and ice made from the ice maker is iced and contained inside the freezing chamber (not shown). An ice bank 195c mounted on may be further provided. In addition, although not shown in the drawing, an ice chute (not shown) for guiding ice contained in the ice bank 195c to fall to the dispenser 160c may be further provided.

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

The display unit 230c displays information such as, for example, a control screen, an operation state, and a temperature inside the chamber. For example, the display unit 230c may display a service type (ice cube, water, ice cubes) of the dispenser, a set temperature of a freezing compartment, and a set temperature of a refrigerator compartment.

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

The input unit 220c may include, for example, a plurality of operation buttons. For example, the input unit 220c includes a dispenser setting button (not shown) for setting a service type (ice cube, water, crushed ice, etc.) of the dispenser, and a freezing chamber temperature setting button (not shown) for setting a freezing chamber temperature. And, a refrigerator compartment temperature setting button (not shown) for setting the freezing compartment temperature, and the like. 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 shown in the drawings, and is a one door type, a sliding door type, and a curtain door type. Regardless of the shape, such as (Curtain Door Type).

11 is a diagram schematically showing the configuration of the refrigerator of FIG. 10 according to an embodiment of the present invention.

Referring to FIG. 11, the refrigerator 100c receives, for example, a compressor 112c, a condenser 116c for condensing the refrigerant compressed in the compressor 112c, and a refrigerant condensed in the condenser 116c. The evaporation may include a freezing chamber evaporator 124c disposed in a freezing chamber (not shown) and a freezing chamber expansion valve 134c for expanding the refrigerant supplied to the freezing chamber evaporator 124c.

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

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

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

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

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

Meanwhile, according to the drawing, since a common evaporator 124c is used for the refrigerating chamber and the freezing chamber, in this case, a damper (not shown) may be installed between the refrigerating chamber and the freezing chamber, and the fan (not shown) is a single evaporator. It is possible to forcibly blow the cold air generated in the refrigerator to be supplied to the freezing and refrigerating chambers.

The compressor 112c of FIG. 12 may be driven by a motor driving device 220, such as FIG. 2, which drives a compressor motor.

Alternatively, the refrigerating compartment fan (not shown) or the freezing compartment fan 144c is driven by a motor driving device 220, as shown in FIG. 2, which drives a refrigerating compartment fan motor (not shown) and a freezing compartment fan motor (not shown), respectively. Can be.

The accompanying drawings are only for making it easier to understand the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings, and all changes and equivalents included in the spirit and scope of the present invention It should be understood to include water or substitutes.

Likewise, while depicting the actions in the drawings in a specific order, it should not be understood that such actions should be performed in that particular order or sequential order shown, or that all illustrated actions should be performed in order to obtain a desired result. . In certain cases, multitasking and parallel processing can be advantageous.

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 belongs without departing from the gist of the present invention claimed in the claims. In addition, various modifications are possible by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

220: motor drive
230: motor
410: overcurrent detection unit
411: voltage variable part
420: inverter
430: gate driver
440: inverter control unit
450: converter

Claims (10)

An inverter having a plurality of switching elements and converting DC power of the DC terminal capacitor into AC power and outputting it to the motor by a switching operation;
An inverter control unit for controlling the inverter;
An overcurrent detection unit that outputs a signal based on the current applied to the inverter; And
A gate driver for controlling on and off of the switching element based on the overcurrent detection signal,
The overcurrent detection unit,
A first resistance element having one end connected to the dc terminal capacitor and the other end connected to the inverter;
A second resistance element having one end connected to the other end of the first resistance element;
A third resistance element having one end connected to the other end of the second resistance element; And
A voltage variable part connected to the other end of the third resistance element and for varying a first voltage applied between the other end of the third resistance element and a ground terminal,
The gate driver,
And outputting a signal for controlling on/off of the plurality of switching elements provided in the inverter to the inverter based on a second voltage applied between the other end of the second resistance element and the ground terminal. Motor drive. delete The method of claim 1,
The gate driver,
When the second voltage is greater than or equal to a preset voltage, an inverter stop signal is output to the inverter. The method of claim 1,
The voltage variable part,
A first capacitor having one end connected to the other end of the third resistance element and the other end connected to the ground terminal;
A fourth resistance element having one end connected to the other end of the third resistance element;
A fifth resistance element having a third voltage input to one end and the other end connected to the other end of the fourth resistance element; And
And a transistor connected between the other end of the fourth resistance element and the ground terminal. The method of claim 4,
The inverter control unit,
And outputting a signal applied to the transistor so that the first voltage is varied. The method of claim 5,
The inverter control unit,
And generating a signal based on a smaller value of the overcurrent setting value of the motor and the overcurrent setting value of the inverter, and outputting the generated signal to the transistor. The method of claim 4,
And a capacitor connected between the other end of the second resistance element and the ground terminal. The method of claim 5,
The transistor,
And a bipolar junction transistor (BJT) having an emitter end connected to the other end of the fourth resistance element, a collector end connected to a ground end, and a base end connected to the inverter controller. The method of claim 5,
The voltage variable part,
A motor driving apparatus further comprising a sixth resistance element between a node connected to the inverter controller and the transistor and a ground terminal. A home appliance comprising the motor drive device of any one of claims 1 and 3 to 9.

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