KR20150074754A - 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 including the same. According to an embodiment of the present invention, the motor driving device comprises: a rectifying unit rectifying input alternating current power source; a boost converter increasing power rectified from the rectifying unit and outputting the same; and an inverter having a plurality of switching elements and outputting the converted alternating current power source to a motor by using the voltage from the boost converter. Accordingly, the motor driving device using a capacitor of low capacity can improve voltage availability of voltage inputted to the inverter.

Description

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor driving apparatus and an air conditioner having the same, and more particularly, to a motor driving apparatus which can improve a voltage utilization rate of a voltage input to an inverter in a motor driving apparatus using a low- The present invention relates to an air conditioner.

The air conditioner is installed to provide a comfortable indoor environment for humans by discharging cold air to the room to adjust the room temperature and purify the room air to create a pleasant indoor environment. Generally, the air conditioner includes an indoor unit which is constituted by a heat exchanger and installed in a room, and an outdoor unit which is constituted by a compressor, a heat exchanger and the like and supplies the refrigerant to the indoor unit.

It is an object of the present invention to provide a motor drive apparatus capable of improving the voltage utilization rate of a voltage input to an inverter in a motor drive apparatus using a capacitor of a low capacity and an air conditioner having the motor drive apparatus.

According to an aspect of the present invention, there is provided a motor drive apparatus including a rectifier for rectifying an input AC power, a boost converter for boosting and outputting a rectified rectified power from the rectifier, and a plurality of switching elements, And an inverter that uses the voltage from the converter to output the converted AC power to the motor.

According to another aspect of the present invention, there is provided an air conditioner including a compressor for compressing refrigerant, a heat exchanger for performing heat exchange using compressed refrigerant, a compressor motor driving device for driving a motor in the compressor, Wherein the compressor motor driving apparatus includes a rectifying section for rectifying the input AC power source, a boost converter for boosting and outputting the power rectified from the rectifying section, and a plurality of switching elements, and using the voltage from the boost converter, And an inverter for outputting the converted AC power to the motor.

According to an embodiment of the present invention, a motor driving apparatus and an air conditioner having the same include a rectifying unit for rectifying an input AC power source, a boost converter for boosting and outputting a rectified power from the rectifying unit, and a plurality of switching devices The voltage utilization rate of the voltage input to the inverter can be improved in the motor driving apparatus using the capacitor of low capacity by including the inverter that outputs the converted AC power to the motor by using the voltage from the boost converter.

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

Further, by using the boost converter, the power factor improving effect is generated.

1 is a diagram illustrating a configuration of an air conditioner according to an embodiment of the present invention.
2 is a schematic view of the outdoor unit and the indoor unit of FIG.
3 is a block diagram of a compressor motor drive apparatus in the outdoor unit of Fig.
4 is an example of a circuit diagram of the motor driving apparatus of Fig.
Figs. 5A and 6B are views referred to the description of the motor driving apparatus of Fig.
FIG. 7 is an example of an internal block diagram of the converter control section of FIG.

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

The suffix "module" and " part "for components used in the following description are given merely for convenience of description, and do not give special significance or role in themselves. Accordingly, the terms "module" and "part" may be used interchangeably.

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.

The indoor unit 31 of the air conditioner is applicable to any of the stand-type air conditioner, the wall-mounted air conditioner, and the ceiling type air conditioner, but the stand type indoor unit 31 is exemplified in the figure.

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

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

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

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

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

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

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

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

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

The outdoor unit 21 includes a compressor 102 for compressing the refrigerant, a compressor 102b for driving the compressor, an outdoor heat exchanger 104 serving to dissipate the compressed refrigerant, An outdoor fan 105 which is disposed at one side of the heat exchanger 104 and includes an outdoor fan 105a for accelerating the heat radiation of the refrigerant and an electric motor 105b for rotating the outdoor fan 105a and an outdoor fan 105 for expanding the condensed refrigerant An accumulator 103 for temporarily storing the gasified refrigerant to remove moisture and foreign substances, and then supplying a refrigerant with a predetermined pressure to the compressor, a compressor 106 for compressing the refrigerant, a cooling / heating switching valve 110 for changing the flow path of the compressed refrigerant, And the like.

The indoor unit 31 includes an indoor heat exchanger 109 disposed inside the room and performing a cooling / heating function, an indoor fan 109a disposed at one side of the indoor heat exchanger 109 for promoting heat radiation of the refrigerant, And an indoor air blower 109 composed of an electric motor 109b for rotating 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. [

Further, the air conditioner 100 may be constituted by a cooling unit that cools the room, or a heat pump that cools or heats the room.

The compressor 102 in the outdoor unit 21 of Fig. 1 can be driven by a compressor motor drive device (200 in Fig. 3) that drives the compressor motor 250. [

Fig. 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.

The compressor motor driving apparatus 200 includes an inverter 220 for outputting a three-phase AC current to the compressor motor 250, an inverter controller 230 for controlling the inverter 220, A converter control unit 215 for controlling the converter 210 and a dc capacitor C between the converter 210 and the inverter 220. [ The compressor motor driving apparatus 200 may further include a dc voltage detection unit B, an input voltage detection unit A, an input current detection unit D, and an output current detection unit E.

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

On the other hand, the motor driving apparatus according to the embodiment of the present invention uses a low-capacity dc single capacitor C of several tens of microfarads or less. For example, the low capacity dc single capacitor C may comprise a film capacitor, rather than an electrolytic capacitor.

When a capacitor of a low capacity is used, the change of the dc step voltage becomes large and pulsates, and the smoothing operation is hardly performed.

Such a motor driving apparatus having a dc short-circuit capacitor C of a low capacity of several tens of microfarads or less can be referred to as a capacitorless-based motor driving apparatus.

In the present specification, the motor driving apparatus 200 having the low-capacity dc short-circuit capacitor C will mainly be described.

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

 The rectifying unit 410 receives the single-phase AC power source 201 and rectifies it to output rectified power.

To this end, the rectifying part 410 is formed by pairing the upper and lower laminated diode elements Da and Db and the lower arm diode elements D'a and D'b, which are connected in series to each other, and two pairs of upper and lower arm diode elements Are connected to each other 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 to each other and a switching element S1 connected between the inductor L1 and the diode D1 between the rectifying part 410 and the inverter 220. [ . The energy stored in the inductor L1 can be output by turning off the switching element S1 and the energy stored in the inductor L1 can be output via the diode D1 by turning off the switching element S1 .

Particularly, in the motor driving apparatus 200 using the dc short capacitor C of a low capacity, a boosted voltage, that is, an offset voltage, can be output from the boost converter 420.

The converter control unit 215 can control the turn-on timing of the switching element S1 in the boost converter 420. [ Thus, the converter switching control signal Scc for turning-on timing of the switching element S1 can be output.

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

The input voltage detecting section A can detect the input voltage Vs from the input AC power supply 201. [ For example, at the front end of the rectifying part 410. [

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

On the other hand, the input voltage detecting section A can also detect the zero crossing point of the input voltage.

Next, the input current detection section D can detect the input current Is from the input AC power source 201. [ Specifically, it can be positioned at the front end of the rectifying part 410. [

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

The dc voltage detection unit B detects the voltage Vdc which is pulsated by the dc short-circuit capacitor C. For power detection, a resistance element, OP AMP, or the like can be used. The detected voltage Vdc of the dc short-circuit capacitor C may be applied to the inverter control unit 230 as a discrete signal in the form of a pulse and may be supplied to the DC voltage Vdc of the dc- The inverter switching control signal Sic can be generated.

On the other hand, unlike the drawing, the detected dc voltage is applied to the converter control unit 215 so that the converter switching control signal Scc may be used to generate it.

The inverter 220 includes a plurality of inverter switching elements and converts the smoothed direct current power supply Vdc into a three-phase alternating current power having a predetermined frequency by the on / off operation of the switching element, .

More specifically, the inverter 220 may include a plurality of switching elements. For example, the upper arm switching elements Sa, Sb, Sc and the lower arm switching elements S'a, S'b, S'c are connected in series to each other and a total of three pairs of upper and lower arm switching elements Can be connected to each other in parallel (Sa & S'a, Sb & S'b, Sc & S'c). Diodes may be connected in anti-parallel to each switching element Sa, S'a, Sb, S'b, Sc, S'c.

The inverter control unit 230 can output the inverter switching control signal Sic to the inverter 220 in order to control the switching operation of the inverter 220. [ The inverter switching control signal (Sic) is based on a switching control signal of a pulse width modulation (PWM), the motor output current flowing through the (250) (i _o) and a dc terminal capacitor ends the dc terminal voltage (Vdc), generated And output. The output current i _{o at} this time can be detected from the output current detection section E and the dc short voltage Vdc can be detected from the dc short voltage detection section B. [

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

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

The inverter control unit 230 includes an inverter control 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 And a control signal output unit (not shown).

(Not shown) receives the three-phase output currents (ia, ib, ic) detected by the output current detecting unit E and converts the three-phase output currents ia, ib and ic into two phase currents iα and iβ in the stationary coordinate system.

On the other hand, the axial conversion unit (not shown) can convert the two-phase current i ?, i? Of the still coordinate system into the two-phase current id, iq of the rotational coordinate system.

)를 연산할 수 있다. 즉, 위치 신호에 기반하여, 시간에 대해, 나누면, 속도를 연산할 수 있게 된다.Based on the position signal H of the rotor input from the position sensing unit (not shown), the speed calculating unit (not shown)

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

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

)와 연산된 속도(

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

) And the calculated speed (

Can be output.

)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 generator (not shown)

) Based on the speed command value ω ^* _r and the target speed ω and generates the current command value i ^* _q based on the speed command value ω ^* _r . For example, the current command generator (not shown)

The PI controller 535 performs the PI control based on the speed command value? ^* _{R that} is the difference between the target speed? And the target speed?, And generates the current command value i ^* _q . In the figure, the q-axis current command value (i ^* _q ) is exemplified by the current command value, but it is also possible to generate the d-axis current command value (i ^* _d ) unlike the figure. On the other hand, the value of the d-axis current command value i ^* _d may be set to zero.

On the other hand, the current command generator (not shown) may further include a limiter (not shown) for limiting the current command value i ^* _q so that the current command value i ^* _q does not exceed the allowable range.

Next, the voltage command generator (not shown) generates a voltage command generator (not shown) based on the d-axis and q-axis currents (i _d , i _q ) The d-axis and q-axis voltage instruction values (v ^* _d , v ^* _q ) are generated based on the instruction values (i ^* _d and i ^* _q ). For example, the voltage command generator (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. The PI controller 548 performs PI control based on the difference between the d-axis current i _d and the d-axis current command value i ^* _d , It is possible to generate the voltage command value v ^* _d . On the other hand, the value of the d-axis voltage command value v ^* _d may be set to zero corresponding to the case where the value of the d-axis current command value i ^* _d is set to zero.

On the other hand, the voltage command generating unit (not shown), d-axis, q-axis voltage command value (v ^* _d, v ^* _q) might further include a limiter (not shown) to limit the level does not exceed the permissible range have.

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

)와, d축, q축 전압 지령치(v^* _d,v^* _q)를 입력받아, 축변환을 수행한다.The axis converting unit (not shown) is connected to a position calculating unit (not shown)

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

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

) Can be used.

Then, the axial conversion unit (not shown) performs conversion from the two-phase stationary coordinate system to the three-phase stationary coordinate system. Through this conversion, the axial conversion unit 1050 outputs the three-phase output voltage instruction values v ^* a, v ^* b, v ^* c.

The switching control signal output unit (not shown) outputs the inverter switching control signal Sic according to the pulse width modulation (PWM) method based on the three-phase output voltage instruction values v ^* a, v ^* b and v ^* And outputs it.

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

Figs. 5A and 6B are views referred to the description of the motor driving apparatus of Fig.

First, FIG. 5A illustrates a dc short-circuit voltage Vdc when the low-capacity dc short-circuit capacitor C is connected to the rectification unit 410 without the boost converter 420 of FIG.

When the dc short capacitor C having a small capacity is used, the dc short capacitor C having a small capacity does not smooth the dc voltage source Vdc as shown in the drawing, and therefore the dc voltage source Vdc And is supplied to the inverter 220 as it is.

In this case, an average voltage is formed at a voltage of about 0.7 VL1, which is lower than the peak value VL1 of the pulsating dc short voltage Vdc.

The inverter 220 can generate three-phase AC power using the voltage of approximately 0.7 VL1, but it is difficult to smoothly drive the motor in a section of approximately 0.7 VL1 or less. Therefore, the voltage utilization rate becomes low.

Also, in the drawing, when the frequency of the input voltage is approximately 60 Hz, a voltage ripple of approximately 120 Hz corresponding to twice the frequency of the input voltage occurs.

On the other hand, when the motor 250 is driven through the inverter 220 using the pulsating voltage as shown in FIG. 5A, a torque ripple corresponding to? T1 is generated as shown in FIG. 5B. This torque ripple causes vibration and noise.

On the other hand, as the capacitance of the low-capacity dc short-circuit capacitor C becomes smaller, the current control or the like is not performed, resulting in a low input power factor characteristic.

To solve this problem, in the present invention, the boost converter 420 is disposed after the rectifying part 410 as shown in Fig.

6A illustrates the dc short voltage Vdc when the boost converter 420 of FIG. 4 and the low-capacity dc short-circuit capacitor C are used.

When the boost converter 420 is used to boost the voltage by the voltage VL2, the ripple voltage having the minimum voltage VL2 and the peak value VL2 + VL1 is output at the dc stage. According to this, approximately, an average voltage can be formed at the voltage VL1.

The inverter 220 can generate three-phase AC power using the voltage VL1 substantially, but can drive the motor smoothly in most voltage periods. Therefore, the voltage utilization ratio increases and the operation region increases.

6A, when the motor 250 is driven through the inverter 220 by the dc short voltage Vdc when the boost converter 420 and the low-capacity dc short-circuit capacitor C are used , Torque ripple corresponding to? T2 is generated as shown in Fig. 6B. That is, a torque ripple corresponding to? T2, which is smaller than? T1 in Fig. 5A, may occur. That is, the torque ripple is considerably reduced.

On the other hand, if the boost converter 420 is used, the input current Is is controlled, and as a result, the input power factor is improved.

FIG. 7 is an example of an internal block diagram of the converter control section of FIG.

Referring to the drawing, the converter controller 215 may include an input current command generator 720, a current controller 730, and a deflector 740.

The input current command generation section 720 receives the input voltage Vs detected by the input voltage detection section A and can generate the input current command value I ^* s based on the input voltage Vs .

The subtractor 725 calculates the difference between the input current command value I ^* s and the input current Is detected by the input current detector D and applies the difference to the current controller 730.

The current control section 730 outputs a first switching control signal (first duty control signal) corresponding to the first duty based on the input current instruction value I ^* s and the input current Is detected by the input current detection section D Sp1).

Specifically, the current controller 730 generates the 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.

On the other hand, the forward compensation unit 740 performs feed-forward compensation to remove the disturbance caused by the input voltage Vs and the dc voltage Vdc of the boost converter 420. Accordingly, the deflection compensation unit 740 can generate the second switching control signal Sp2 corresponding to the second duty, taking into consideration disturbance cancellation.

The adder 735 can output the converter switching control signal Scc by adding the first switching control signal Sp1 and the second switching control signal Sp2. That is, the adder 735 can output the converter switching control signal Scc in consideration of the first duty and the second duty.

The motor driving apparatus and the air conditioner having the same according to the present invention are not limited to the configuration and the method of the embodiments described above but the embodiments can be applied to all of the embodiments Or some of them may be selectively combined.

Meanwhile, the motor driving apparatus or the air conditioner operating method of the present invention can be implemented as a processor-readable code on a recording medium readable by a processor included in a motor driving apparatus or an air conditioner. The processor-readable recording medium includes all kinds of recording apparatuses in which data that can be read by the processor is stored. Examples of the recording medium that can be read by the processor include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may also be implemented in the form of a carrier wave such as transmission over the Internet . In addition, the processor-readable recording medium may be distributed over network-connected computer systems so that code readable by the processor in a distributed fashion can be stored and executed.

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

Claims (12)

A rectifying unit for rectifying the input AC power;
A boost converter for boosting a power source rectified by the rectifier and outputting the boosted power; And
And an inverter that has a plurality of switching elements and uses the voltage from the boost converter to output the converted AC power to the motor. The method according to claim 1,
Further comprising a capacitor disposed between the boost converter and the inverter and storing a ripple voltage from the boost converter. 3. The method of claim 2,
Wherein the capacitor comprises a film capacitor. The method according to claim 1,
The boost converter includes:
An inductor and a diode connected in series between the rectifying unit and the inverter;
And a switching element connected between the inductor and the diode. The method according to claim 1,
An input current detector for detecting an input current from the input AC power supply;
An input voltage detector for detecting an input voltage from the input AC power supply; And
And a converter controller for outputting a converter switching control signal for controlling a switching element in the boost converter based on the input current and the input voltage. 6. The method of claim 5,
The converter control unit includes:
An input current command generator for generating an input current command value based on the detected input voltage;
And a current control unit for generating a first switching control signal based on the input current command value and the detected input current. The method according to claim 6,
The converter control unit includes:
And a directional compensation unit for generating a second switching control signal,
And outputs the converter switching control signal based on the first switching control signal and the second switching control signal. The method according to claim 1,
A dc voltage detection unit detecting a dc voltage between the boost converter and the inverter;
An output current detector for detecting an output current flowing to 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 the refrigerant;
A heat exchanger for performing heat exchange using the compressed refrigerant; And
And a compressor motor drive device for driving a motor in the compressor,
The compressor motor drive apparatus includes:
A rectifying unit for rectifying the input AC power;
A boost converter for boosting a power source rectified by the rectifier and outputting the boosted power; And
And an inverter that has a plurality of switching elements and uses the voltage from the boost converter to output the converted AC power to the motor. In the ninth aspect,
The compressor motor drive apparatus includes:
Further comprising a capacitor disposed between the boost converter and the inverter and storing a ripple voltage from the boost converter. 10. The method of claim 9,
The compressor motor drive apparatus includes:
An input current detector for detecting an input current between the rectifying unit and the boost converter;
An input voltage detector for detecting an input voltage between the rectifying unit and the boost converter; And
Further comprising a converter control unit for outputting a converter switching control signal for controlling a switching element in the boost converter based on the input current and the input voltage. 12. The method of claim 11,
The converter control unit includes:
An input current command generator for generating an input current command value based on the detected input voltage;
And a current control unit for generating a first switching control signal based on the input current command value and the detected input current.

Images