KR102136153B1 - Motor driving device and air conditioner including the same - Google Patents

Abstract

The present invention relates to a motor driving device and an air conditioner having the same. A motor driving apparatus according to an embodiment of the present invention includes a rectifier for rectifying an input AC power source, a boost converter for boosting and outputting power rectified from the rectifier, and compensating for a phase with respect to an input voltage from the input AC power, and phase Based on the compensated input voltage, a converter control unit for outputting a converter switching control signal for controlling a switching element in the boost converter, and a plurality of switching elements, and a converted AC power supply using the voltage from the boost converter. It includes an inverter that outputs to the motor. Accordingly, it is possible to reduce input current distortion in a motor driving apparatus using a capacitor having a low capacity.

Description

Motor driving device and air conditioner including the same}

The present invention relates to a motor driving device and an air conditioner having the same, and more particularly, to a motor driving device capable of reducing input current distortion in a motor driving device using a low-capacity capacitor, and an air conditioner having the same. will be.

The air conditioner is installed to provide a more comfortable indoor environment to humans by discharging cold and hot air into the room to create a pleasant indoor environment, adjusting the indoor temperature, and purifying the indoor air. In general, an air conditioner includes an indoor unit configured as a heat exchanger and installed indoors, and an outdoor unit configured with a compressor and a heat exchanger to supply refrigerant to the indoor unit.

An object of the present invention is to provide a motor driving device capable of reducing input current distortion in a motor driving device using a low-capacitance capacitor, and an air conditioner having the same.

A motor driving apparatus according to an embodiment of the present invention for achieving the above object includes a rectifier for rectifying an input AC power, a boost converter for boosting and outputting power rectified from the rectifier, and an input voltage from the input AC power. Compensating the phase and, based on the phase-compensated input voltage, a converter control unit for outputting a converter switching control signal for controlling a switching element in the boost converter, and a plurality of switching elements, using the voltage from the boost converter , And an inverter that outputs the converted AC power to the motor.

In addition, an air conditioner according to an embodiment of the present invention for achieving the above object includes a compressor for compressing a refrigerant, a heat exchanger for performing heat exchange by using the compressed refrigerant, and a compressor motor driving device for driving a motor in the compressor. Including, the compressor motor driving device, a rectifier for rectifying the input AC power, a boost converter for boosting and outputting the power rectified from the rectifier, and compensates the phase for the input voltage from the input AC power, and phase compensated Based on the input voltage, a converter control unit that outputs a converter switching control signal for controlling a switching element in the boost converter, and a plurality of switching elements, and using the voltage from the boost converter, converts AC power to a motor. Includes an output inverter.

According to an embodiment of the present invention, a motor driving device and an air conditioner having the same include a rectifier for rectifying input AC power, a boost converter for boosting and outputting power rectified from the rectifier, and an input voltage from the input AC power. A converter control unit for compensating a phase for and outputting a converter switching control signal for controlling a switching element in the boost converter, based on the phase-compensated input voltage, and a plurality of switching elements, wherein the voltage from the boost converter is By including an inverter that outputs the converted AC power to the motor, it is possible to reduce input current distortion in a motor driving apparatus using a low-capacity capacitor.

In addition, the power factor is improved and the input current ripple is reduced.

Further, when the inverter uses the voltage boosted by the boost converter, the torque ripple at the time of driving the motor is reduced.

1 is a diagram illustrating a configuration of an air conditioner according to an embodiment of the present invention.
2 is a schematic diagram of the outdoor unit and the indoor unit of FIG. 1.
3 is a block diagram of a compressor motor driving apparatus in the outdoor unit of FIG. 1.
4 is an example of a circuit diagram of the motor driving apparatus of FIG. 3.
5 is an example of an internal block diagram of the converter control unit of FIG. 4.
6 to 8 are views referenced for explanation of the motor driving apparatus of FIG. 4.

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

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.

1 is a diagram illustrating a configuration of an air conditioner according to an embodiment of the present invention.

The air conditioner 100 according to the present invention may include an indoor unit 31 and an outdoor unit 21 connected to the indoor unit 31 as shown in FIG. 1.

The indoor unit 31 of the air conditioner is applicable to any of 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 31 is illustrated.

Meanwhile, the air conditioner 100 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 21 includes a compressor (not shown) that receives and compresses a refrigerant, an outdoor heat exchanger (not shown) that heats the refrigerant and outdoor air, and an accumulator (not shown) that extracts gaseous refrigerant from the supplied refrigerant and supplies it to the compressor. Si) 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, etc. are further included, but a description of the configuration thereof will be omitted below.

The outdoor unit 21 operates a compressor and an outdoor heat exchanger provided to compress or heat exchange the refrigerant according to a setting to supply the refrigerant to the indoor unit 31. The outdoor unit 21 may be driven by a remote controller (not shown) or a demand of the indoor unit 31. 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.

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

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

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

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

2 is a schematic diagram of the outdoor unit and the indoor unit of FIG. 1.

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

The outdoor unit 21 includes a compressor 102 that compresses a refrigerant, a compressor motor 102b that drives the compressor, an outdoor heat exchanger 104 that dissipates the compressed refrigerant, and an outdoor unit. An outdoor blower 105 comprising an outdoor fan 105a that is disposed on one side of the heat exchanger 104 to promote heat dissipation of the refrigerant and an electric motor 105b that rotates the outdoor fan 105a, and expansion to expand the condensed refrigerant A mechanism 106, a cooling/heating switching valve 110 that changes the flow path of the compressed refrigerant, and an accumulator 103 that temporarily stores the gasified refrigerant to remove moisture and foreign substances, and then supplies a refrigerant having a constant pressure to the compressor. And the like.

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

At least one indoor heat exchanger 109 may be installed. At least one of an inverter compressor and a constant speed compressor may be used as the compressor 102.

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

The compressor 102 in the outdoor unit 21 of FIG. 1 may be driven by a compressor motor driving device (200 of FIG. 3) that drives the compressor motor 250.

3 is a block diagram of a compressor motor driving apparatus in the outdoor unit of FIG. 1, and FIG. 4 is an example of a circuit diagram of the motor driving apparatus of FIG. 3.

Referring to the drawings, the compressor motor driving apparatus 200 includes an inverter 220 that outputs a three-phase AC current to the compressor motor 250, an inverter controller 230 that controls the inverter 220, and an inverter 220. A converter 210 that supplies DC power to the converter 210, a converter controller 215 that controls the converter 210, and a dc terminal capacitor C between the converter 210 and the inverter 220 may be included. Meanwhile, the compressor motor driving apparatus 200 may further include a dc terminal voltage detector (B), an input voltage detector (A), an input current detector (D), and an output current detector (E).

The motor driving device 200 receives AC power from a system, converts power, and supplies the converted power to the motor 250. Accordingly, the motor driving device 200 may also be referred to as a power conversion device.

On the other hand, it is assumed that the motor driving apparatus according to the embodiment of the present invention uses a low-capacity dc stage capacitor C of tens of μF or less. For example, the low-capacity dc terminal capacitor C may include a film capacitor, not an electrolytic capacitor.

In the case of using a low-capacity capacitor, a change in the voltage of the dc terminal becomes large, pulsating, and smoothing is hardly performed.

Such a motor driving device including a low-capacity dc terminal capacitor C of several tens of μF or less may be referred to as a capacitorless based motor driving device.

In this specification, a description will be given mainly on the motor driving device 200 having a low-capacity dc terminal capacitor C.

The converter 210 converts input AC power into DC power. The converter 210 may be a concept including a rectifier 410 and a boost converter 420.

The rectifier 410 receives and rectifies the single-phase AC power 201 and outputs the rectified power.

To this end, the rectifying unit 410 is a pair of upper-arm diode elements (Da, Db) and lower-arm diode elements (D'a, D'b) connected in series with each other, and a total of two pairs of upper and lower-arm diode elements It illustrates that they are connected in parallel (Da & D'a, Db & D'b). That is, they can be connected to each other in the form of a bridge.

The boost converter 420 includes an inductor L1 and a diode D1 connected in series with each other between the rectifier 410 and the inverter 220, and a switching element S1 connected between the inductor L1 and the diode D1. ). Energy stored in the inductor L1 may be stored in the inductor L1 by turning on the switching element S1, and then the energy stored in the inductor L1 may be output through the diode D1 due to the switching element S1 off. .

Particularly, in the motor driving apparatus 200 using a low-capacity dc terminal capacitor C, a voltage boosted by a predetermined voltage, that is, offset, from the boost converter 420 may be output.

The converter control unit 215 may control a turn-on timing of the switching element S1 in the boost converter 420. Accordingly, it is possible to output the converter switching control signal Scc for the turn-on timing of the switching element S1.

To this end, the converter control unit 215 may receive an input voltage Vs and an input current Is from the input voltage detection unit A and the input current detection unit B, respectively.

The input voltage detection unit A can detect the input voltage Vs from the input AC power supply 201. For example, it may be located in front of the rectifying unit 410.

The input voltage detection unit A may include a resistance element, an OP AMP, or the like for voltage detection. The detected input voltage Vs is a discrete signal in the form of a pulse and may be applied to the converter controller 215 to generate the converter switching control signal Scc.

On the other hand, by the input voltage detection unit A, the zero crossing point of the input voltage can also be detected.

Next, the input current detection unit D can detect the input current Is from the input AC power supply 201. Specifically, it may be located in front of the rectifying unit 410.

The input current detection unit D may include a current sensor, a current trnasformer (CT), a shunt resistor, or the like for current detection. The detected input voltage Is is a discrete signal in the form of a pulse and may be applied to the converter control unit 215 to generate the converter switching control signal Scc.

The dc voltage detector (B) detects the pulsating voltage (Vdc) of the dc terminal capacitor (C). For power detection, a resistance element, an OP AMP, or the like can be used. The detected voltage (Vdc) of the DC terminal capacitor C is a pulsed discrete signal, and may be applied to the inverter control unit 230, and is applied to the DC voltage Vdc of the DC terminal capacitor C. Based on the inverter switching control signal Sic may be generated.

On the other hand, unlike the drawings, the detected dc voltage may be applied to the converter control unit 215 to generate a converter switching control signal Scc.

The inverter 220 includes a plurality of inverter switching elements, and converts the DC power (Vdc) smoothed by the on/off operation of the switching element into a three-phase AC power having a predetermined frequency, and outputs it to the three-phase motor 250. I can.

Specifically, the inverter 220 may include a plurality of switching elements. For example, a pair of upper-arm switching elements (Sa, Sb, Sc) and lower-arm switching elements (S'a, S'b, S'c) connected in series with each other, respectively, and a total of three pairs of upper and lower arm switching elements May be connected to each other in parallel (Sa&S'a,Sb&S'b,Sc&S'c). Further, diodes may be connected in reverse parallel to each of the switching elements Sa, S'a, Sb, S'b, Sc, and S'c.

The inverter controller 230 may output an inverter switching control signal Sic to the inverter 220 in order to control a switching operation of the inverter 220. Inverter switching control signal (Sic) is a pulse width modulation (PWM) switching control signal, generated based on the output current (i _o ) flowing through the motor 250 and the dc terminal voltage (Vdc) across the dc terminal capacitor. Can be printed. The output current i _{o at} this time may be detected from the output current detector E, and the dc end voltage Vdc may be detected from the dc end voltage detector B.

The output current detection unit E may detect an output current i _o flowing between the inverter 420 and the motor 250. That is, the current flowing through the motor 250 is detected. The output current detection unit E may detect all of the output currents ia, ib, ic of each phase, or may detect the output currents of two phases using three-phase balance.

The output current detection unit E may be located between the inverter 220 and the motor 250, and a current trnasformer (CT), a shunt resistor, or the like may be used for current detection.

The inverter control unit 230 includes an axis conversion unit (not shown), a speed calculation unit (not shown), a current command generation unit (not shown), a voltage command generation unit (not shown), an axis conversion unit (not shown), and a switching unit. It may include a control signal output unit (not shown).

The axis conversion unit (not shown) receives the three-phase output current (ia, ib, ic) detected by the output current detection unit E and converts it into two-phase currents (iα, iβ) of the stationary coordinate system.

On the other hand, the axis conversion unit (not shown) may convert the two-phase currents iα and iβ of the stationary coordinate system into the two-phase currents id and iq of the rotational coordinate system.

)를 연산할 수 있다. 즉, 위치 신호에 기반하여, 시간에 대해, 나누면, 속도를 연산할 수 있게 된다.The speed calculation unit (not shown) is based on the position signal H of the rotor input from the position detection unit (not shown), the speed (

) Can be calculated. That is, based on the position signal, it is possible to calculate the speed by dividing it over time.

Meanwhile, the position sensing unit (not shown) may detect the position of the rotor of the motor 250. To this end, the position detection unit (not shown) may include a Hall sensor.

)와 연산된 속도(

)를 출력할 수 있다.On the other hand, the speed calculating unit (not shown), the position calculated based on the input position signal (H) of the rotor (

) And calculated speed (

) Can be printed.

)와 목표 속도(ω)에 기초하여, 속도 지령치(ω^* _r)를 연산하며, 속도 지령치(ω^* _r)에 기초하여, 전류 지령치(i^* _q)를 생성한다. 예를 들어, 전류 지령 생성부(미도시)는, 연산 속도(

)와 목표 속도(ω)의 차이인 속도 지령치(ω^* _r)에 기초하여, PI 제어기(535)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 (not shown), the calculation speed (

) And the target speed (ω), the speed command value (ω ^* _r ) is calculated, and the current command value (i ^* _q ) is generated based on the speed command value (ω ^* _r ). For example, the current command generation unit (not shown), the calculation speed (

Based on the speed command value (ω ^* _r ) that is the difference between) and the target speed (ω), the PI controller 535 performs PI control, and a current command value (i ^* _q ) can be generated. In the drawing, the q-axis current command value (i ^* _q ) is illustrated as the current command value, 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 (not shown) may further include a limiter (not shown) that limits the level of the current command value i ^* _q so that it does not exceed an allowable range.

Next, the voltage command generation unit (not shown) is the d-axis and q-axis currents (i _d , i _q ) converted from the axis conversion unit to the two-phase rotational coordinate system, and the current in the current command generation unit (not shown). Based on the command values (i ^* _d ,i ^* _q ), the d-axis and q-axis voltage command values (v ^* _d ,v ^* _q ) are generated. For example, the voltage command generation unit (not shown) performs PI control in the PI controller 544 based on the difference between the q-axis current (i _q ) and the q-axis current command value (i ^* _q ), The q-axis voltage command value (v ^* _q ) can be generated. In addition, the voltage command generation unit (not shown) performs PI control in the PI controller 548 based on the difference between the d-axis current (i _d ) and the d-axis current command value (i ^* _d ), and The voltage command value (v ^* _d ) can be generated. Meanwhile, the value of the d-axis voltage command value (v ^* _d ) may be set to 0 corresponding to the case where the value of the d-axis current command value (i ^* _d ) is set to 0.

On the other hand, the voltage command generation unit (not shown) may further include a limiter (not shown) that limits the level of the d-axis and q-axis voltage command values (v ^* _d ,v ^* _q ) to not exceed the allowable range. have.

On the other hand, the generated d-axis and q-axis voltage command values (v ^* _d and v ^* _q ) are input to an axis conversion unit (not shown).

)와, d축, q축 전압 지령치(v^* _d,v^* _q)를 입력받아, 축변환을 수행한다.The axis conversion unit (not shown) is a position calculated by the speed calculation unit (not shown) (

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

)가 사용될 수 있다.First, the axis conversion unit (not shown) performs conversion from a two-phase rotating coordinate system to a two-phase stationary coordinate system. At this time, the position calculated by the speed calculation unit (not shown) (

) Can be used.

In addition, the axis conversion unit (not shown) performs conversion from a 2-phase stationary coordinate system to a 3-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 (not shown) generates a switching control signal Sic for an inverter according to a pulse width modulation (PWM) method based on a three-phase output voltage command value (v ^* a, v ^* b, v ^* c). Generate and print.

The output inverter switching control signal Sic may be converted into a gate driving signal in a gate driver (not shown) and may be input to the gates of each switching element in the inverter 220. Accordingly, each of the switching elements Sa, S'a, Sb, S'b, Sc, S'c in the inverter 220 performs a switching operation.

5 is an example of an internal block diagram of the converter control unit of FIG. 4.

Referring to the drawings, the converter control unit 215 includes a phase compensation unit 710, an input current command generation unit 720, a current flow control unit 730, a forward compensation unit 740, and a variable voltage control unit 750. Can be equipped.

The phase compensation unit 710 performs phase compensation on the phase of the input voltage. Specifically, ground compensation is performed on the phase of the input voltage.

For example, the phase compensation unit 710 may delay the phase of the input voltage Vs by a preset predetermined value in consideration of the input current IS that is phase delayed compared to the input voltage Vs. I can. Accordingly, a ground compensation phase value Sdc corresponding to a predetermined value may be output.

As another example, the phase compensation unit 710 determines a zero crossing point of the input current Is detected by the input current detection unit D and a zero crossing point of the input voltage Vs detected by the input voltage detection unit A. Compared or corresponding to the difference, a phase value to be compensated may be calculated, and the calculated delay compensation phase value Sdc may be output.

The adder 705 may add the input voltage Vs detected by the input voltage detection unit A and the delay compensation phase value Sdc of the phase compensation unit 710. That is, the delay compensation phase value Sdc may be added to the phase of the input voltage Vs. In addition, the phase-compensated input voltage value V's may be output to the input current command generation unit 720.

The input current command generation unit 720 receives an input voltage value V's for which phase compensation, particularly ground compensation has been performed, and based on the received phase compensated input voltage V's, the input current command value I ^* s) can be created.

Meanwhile, the subtractor 725 calculates a difference between the input current command value I ^* s and the input current Is detected by the input current detection unit D, and applies the difference to the current control unit 730.

The current control unit 730 includes a first switching control signal corresponding to a first duty based on the input current command value I ^* s and the input current Is detected by the input current detector D. Sp1) is created.

Specifically, the current controller 730 generates a first switching control signal corresponding to the first duty based on the difference between the input current command value I ^* s and the input current Is.

Meanwhile, the forward compensation unit 740 performs feed-forward compensation in order to remove the disturbance consisting of the input voltage Vs and the dc voltage Vdc of the boost converter 420. Accordingly, the forward compensation unit 740 may generate a second switching control signal Sp2 corresponding to the second duty in consideration of the distortion removal.

Meanwhile, the variable voltage controller 750 controls the pulsating voltage of the dc terminal voltage Vdc, which is both ends of the capacitor C, and based on the controlled pulsating voltage, a third switching control signal corresponding to the third duty ( Spa) can be created.

For example, the variable voltage controller 750 may generate a third switching control signal Spa corresponding to the third duty based on an AC component excluding a DC component among the pulsating voltages of the dc terminal voltage Vdc. have.

According to this, the input current command generation unit 720 or the forward compensation unit 740 can generate a switching control signal by only in charge of the DC component of the pulsating voltage of the DC terminal voltage Vdc, thereby reducing the burden. It will be.

The adder 735 may add the first switching control signal Sp1, the second switching control signal Sp2, and the third switching control signal Spa to output a converter switching control signal Scc. That is, the adder 735 may output the converter switching control signal Scc in consideration of the first duty to the third duty.

As described above, when the phase compensation unit 710 is used, even in a voltage region in which boosting is insufficient, despite the use of the boost converter 420, current distortion of the input current can be reduced. This will be described in detail with reference to FIG. 6 below.

6 to 8 are views referenced for explanation of the motor driving apparatus of FIG. 4.

First, FIG. 6 is a diagram showing a duty ratio for driving the switching element S1 in the boost converter 410. The horizontal axis is the time axis, and the vertical axis may indicate the level of the duty ratio.

In order to solve the decrease in the DC terminal voltage utilization rate due to the low-capacity DC terminal capacitor C, when the boost converter 410 is used, to drive the switching element S1, the first duty ratio curve Cu1 of FIG. 6 ) May be generated by the converter control unit 215.

In detail, despite the boost converter 410, input current distortion occurs due to a voltage region in which the boost is insufficient, and accordingly, an error occurs in a portion with a low duty ratio, such as the first duty ratio curve Cu1. Is done. In the drawing, due to this error, a first duty ratio curve Cu1 partially distorted to the left is illustrated.

In the embodiment of the present invention, in order to solve this point, phase compensation is performed on the input voltage. For example, the phase of the input voltage Vs may be delayed by a preset predetermined value.

In this way, by generating a current command value in response to the phase-compensated input voltage, and generating a converter switching control signal for controlling the boost converter 410 based on the current command value, as shown in the second duty ratio curve Cu2 , Even in the portion where the duty ratio is low, the error is improved. Accordingly, it is possible to reduce the distortion of the input current.

In addition, by using the variable voltage control unit 750 to generate a converter switching control signal in consideration of the pulsating voltage of the dc end voltage, it is possible to perform pulsation voltage compensation of the dc end voltage. Accordingly, the power factor is improved and the current ripple with respect to the input current is reduced.

Next, FIG. 7 illustrates a graph of each input current, input voltage, and dc terminal voltage when input voltage compensation and variable voltage control are not performed.

Referring to the drawings, FIG. 7 is an input current (Is1), an input voltage (Vs1), and a dc terminal voltage respectively detected by an input current detection unit (D), an input voltage detection unit (A), and a dc terminal voltage detection unit (B). The graph of (Vdc1) is illustrated.

It can be seen that the dc terminal voltage Vdc1 has a frequency twice as high as the input voltage Vs1, and pulsates due to the low-capacity capacitor C.

On the other hand, it can be seen that the input current Is1 is distorted with respect to the input current in a specific period TP1, particularly in a region in which the dc terminal voltage Vdc1 is low. Due to this input current distortion, eventually, the power factor is lowered.

Next, FIG. 8 illustrates a graph of each input current, input voltage, and dc terminal voltage when input voltage compensation and variable voltage control are performed.

Referring to the drawings, FIG. 8 shows an input current (Is2), an input voltage (Vs2), and a dc terminal voltage detected by an input current detection unit (D), an input voltage detection unit (A), and a dc terminal voltage detection unit (B), respectively. The graph of (Vdc2) is illustrated.

As shown in the figure, it can be seen that the detected input current Is2 has reduced input current distortion compared to FIG. 7. In particular, it can be seen that in the specific period TP1 corresponding to the specific period TP1 of FIG. 7, the distortion of the input current is reduced.

As described above, when the input voltage compensation and the variable voltage control are performed, the duty error is improved even in the portion where the duty ratio is low, and thus, distortion of the input current can be reduced, and the pulsating voltage of the dc voltage Since the compensation can be performed, the power factor is improved and the current ripple for the input current is reduced.

The motor driving device and the air conditioner having the same according to the present invention are not limited to the configuration and method of the embodiments described as described above, but the embodiments are all of the embodiments so that various modifications can be made. Alternatively, some may be selectively combined and configured.

Meanwhile, the method of operating a motor driving device or air conditioner according to the present invention can be implemented as a code that can be read by a processor on a recording medium that can be read by a processor provided in the motor driving device or the air conditioner. The processor-readable recording medium includes all types of recording devices that store data that can be read by the processor. Examples of recording media that can be read by the processor include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, etc., and also include those implemented in the form of carrier waves such as transmission through the Internet. . Further, the processor-readable recording medium is distributed over a computer system connected through a network, so that the processor-readable code can be stored and executed in a distributed manner.

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.

Claims (13)

A rectifier for rectifying the input AC power;
A boost converter for boosting and outputting the power rectified from the rectifier;
A converter controller for compensating a phase for an input voltage from the input AC power source and outputting a converter switching control signal for controlling a switching element in the boost converter based on the phase-compensated input voltage;
An inverter having a plurality of switching elements and outputting the converted AC power to a motor by using the voltage from the boost converter;
A capacitor disposed between the boost converter and the inverter and storing the pulsating voltage from the boost converter,
The control unit,
When the voltage at the dc terminals across the capacitor pulsates, in a zero-crossing region, the phase of the input voltage from the input AC power is compensated, and the phase compensated input voltage and the pulsating voltage are applied to an AC component other than a DC component. On the basis of the motor driving apparatus, characterized in that outputting a converter switching control signal for controlling the switching element in the boost converter. The method of claim 1,
The converter control unit,
And performing ground compensation on the phase of the input voltage, and outputting the converter switching control signal based on the ground compensated input voltage. delete The method of claim 1,
The capacitor is a motor driving device, characterized in that it comprises a film capacitor. The method of claim 1,
The converter control unit,
And controlling the pulsating voltage across the capacitor and outputting the converter switching control signal based on the controlled pulsating voltage. The method of claim 1,
The boost converter,
An inductor and a diode connected in series between the rectifier and the inverter; And
And a switching element connected between the inductor and the diode. The method of claim 1,
An input voltage detector configured to detect the input voltage from the input AC power source;
An input current detection unit detecting an input current from the input AC power supply;
Also includes; a dc terminal voltage detector for detecting a dc terminal voltage between the boost converter and the inverter,
The converter control unit,
A phase compensation unit that performs phase compensation on the detected input voltage;
An input current command generation unit that generates an input current command value based on the phase-compensated input voltage;
And a current controller configured to generate a first switching control signal based on the input current command value and the detected input current. The method of claim 7,
The converter control unit,
A forward compensation unit for generating a second switching control signal by performing forward compensation based on the dc voltage;
A variable voltage control unit that controls the pulsation voltage of the DC terminal voltage and generates a third switching control signal based on the controlled pulsation voltage; further includes,
And outputting the converter switching control signal based on the first to third switching control signals. The method of claim 1,
A dc terminal voltage detector configured to detect a dc terminal voltage between the boost converter and the inverter;
An output current detector for detecting an output current flowing through the motor; And
And an inverter control unit for controlling the inverter based on the detected dc voltage and the detected output current. A compressor for compressing a refrigerant;
A heat exchanger for performing heat exchange using the compressed refrigerant; And
Comprising a compressor motor driving device for driving a motor in the compressor,
The compressor motor driving device,
A rectifier for rectifying the input AC power;
A boost converter for boosting and outputting the power rectified from the rectifier;
A converter controller for compensating a phase for an input voltage from the input AC power source and outputting a converter switching control signal for controlling a switching element in the boost converter based on the phase-compensated input voltage;
An inverter having a plurality of switching elements and outputting the converted AC power to a motor by using the voltage from the boost converter;
A capacitor disposed between the boost converter and the inverter and storing the pulsating voltage from the boost converter,
The control unit,
When the voltage at the dc terminals across the capacitor pulsates, in a zero-crossing region, the phase of the input voltage from the input AC power is compensated, and the phase compensated input voltage and the pulsating voltage are applied to an AC component other than a DC component. On the basis of, the air conditioner, characterized in that outputting a converter switching control signal for controlling the switching element in the boost converter. delete The method of claim 10,
The compressor motor driving device,
An input voltage detector configured to detect the input voltage from the input AC power source;
An input current detection unit detecting an input current from the input AC power supply;
Also includes; a dc terminal voltage detector for detecting a dc terminal voltage between the boost converter and the inverter,
The converter control unit,
A phase compensation unit that performs phase compensation on the detected input voltage;
An input current command generation unit that generates an input current command value based on the phase-compensated input voltage;
And a current control unit configured to generate a first switching control signal based on the input current command value and the detected input current. The method of claim 12,
The converter control unit,
A forward compensation unit for generating a second switching control signal by performing forward compensation based on the dc voltage;
A variable voltage control unit that controls the pulsation voltage of the DC terminal voltage and generates a third switching control signal based on the controlled pulsation voltage; further includes,
An air conditioner, characterized in that to output the converter switching control signal based on the first to third switching control signals.

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