KR101878146B1 - Power transforming apparatus and air conditioner including the same - Google Patents

Abstract

The present invention relates to a power transforming apparatus capable of reducing noise and vibration of a compressor motor, and an air conditioner including the same. The power transforming apparatus includes: an inverter unit for outputting a current for driving a compressor motor; and an inverter control unit for controlling the inverter unit. The inverter unit includes: a current sensing unit for sensing a current output from an inverter; a speed calculating unit for calculating a speed of the compressor motor based on the sensed current; a speed control unit for performing a proportional-integral control and a ripple removal based on the calculated speed and a target speed to generate a target current; a torque control unit for generating a d-axis target current and a q-axis target current based on the generated target current and a current sensed from the current sensing unit; a current control unit for generating a target voltage based on the d-axis target current and the q-axis target current; and a driving unit for generating a driving signal based on the generated target voltage and driving the inverter unit according to the generated driving signal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power conversion apparatus and an air conditioner including the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power conversion device, and more particularly, to a power conversion device capable of reducing noise and vibration of a compressor motor and an air conditioner including the same.

Generally, a compressor of an air conditioner uses a motor as a driving source. These motors are supplied with AC power from a power conversion device.

It is generally known that such a power conversion apparatus mainly constitutes a rectification section, a power factor control section, and an inverter type power conversion section.

First, the commercial voltage of the AC output from the commercial power source is rectified by the rectifying part. The voltage rectified in this rectifying part is supplied to a power converting part such as an inverter. At this time, the power converting unit generates AC power for driving the motor by using the voltage output from the rectifying unit.

In some cases, a DC-DC converter for improving the power factor may be provided between the rectification unit and the inverter, and a DC stage capacitor may be provided between the converter and the inverter.

The compressor used in the air conditioner mainly uses a one-piston rotary compressor. Such a compressor has price competitiveness, but when applied to a product, noise and vibration problems at a low speed are pointed out as issues .

In order to solve these problems, a conventional power conversion apparatus controls a compressor motor using an inverter controller having a repeating controller.

However, the conventional inverter controller having a repetitive controller has a complicated circuit configuration, requires a high-performance microcomputer, raises the price, and has problems that are greatly influenced by the characteristics of the compressor.

Accordingly, there is a demand for a power conversion apparatus having an inverter controller that minimizes noise and vibration due to the low-speed operation of the compressor motor while minimizing the manufacturing cost, and is not affected by the characteristics of the compressor.
[Prior Art Documents] Korean Patent Registration 10-1162954 (June 29, 2012)

The present invention is directed to solving the above-mentioned problems and other problems. Another object of the present invention is to provide a power conversion device capable of minimizing noise and vibration of a compressor motor by controlling the speed of a compressor motor by performing proportional-integral control and ripple removal of a sensed speed from a compressor motor, .

It is another object of the present invention to provide a power conversion apparatus and an air conditioner including the same that can minimize the speed ripple and speed calculation by compensating the time delay of the operation speed.

It is another object of the present invention to provide a power conversion apparatus and an air conditioner including the power conversion apparatus that can be applied to a low-cost microcomputer by minimizing a calculation amount of the inverter control unit.

A power conversion apparatus according to an embodiment of the present invention includes an inverter unit for outputting a current for driving a compressor motor and an inverter control unit for controlling the inverter unit. The inverter control unit includes a current sensing unit A speed control unit for generating a target current by performing a proportional-integral control and a ripple removal based on the computed computation speed and a target speed, A current control section for generating a target voltage based on the d-axis target current and the q-axis target current, and a current control section for generating a target voltage based on the d-axis target current and the q- And a driving unit that generates a driving signal based on the target voltage and drives the inverter unit according to the generated driving signal.

Here, the speed control unit includes a proportional-integral controller that performs proportional-integral control based on the operation speed and a target speed, a resonant controller that is connected in parallel with the proportional-integral controller and removes ripple components based on the operation speed and the target speed .

The speed control unit may include a subtractor for calculating a difference between the computation speed and the target speed and outputting the computed difference to the proportional-integral controller and the resonance controller.

The speed control unit may include an adder for outputting the target current by summing the speed at which the proportional-integral control is performed from the proportional-integral controller and the speed at which the ripple component is removed from the resonant controller.

The speed control unit may include a field annunciation compensation filter that compensates for the computation speed and the time delay of the target speed and outputs the compensated filter to the resonance controller.

And, the display year compensation filter may be connected in parallel with the proportional-integral controller and in series with the resonant controller.

Then, the speed calculating unit estimates the rotor position of the compressor motor based on the sensed current, and outputs the estimated position signal to the current sensing unit.

Next, the current sensing unit may sense the d-axis estimated current and the q-axis estimated current according to the received estimated position signal and output it to the torque control unit upon receiving the estimated position signal from the speed calculating unit.

Then, the torque control unit can generate the d axis estimated current and the q axis estimated current from the current sensing unit based on the target current, and the d axis target current and the q axis target current, respectively.

According to another aspect of the present invention, there is provided an air conditioner comprising: a current sensing unit for sensing a current output from an inverter; a speed calculating unit for calculating a speed of a compressor motor based on a sensed current; A torque control unit for generating a d-axis target current and a q-axis target current based on the current sensed from the generated target current and the current sensing unit, a current control unit for generating a target voltage based on the d-axis target current and the q-axis target current, and a drive unit for generating a drive signal based on the generated target voltage and driving the inverter unit in accordance with the generated drive signal Power conversion device.

Effects of the power conversion apparatus and the air conditioner including the power conversion apparatus according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, noise and vibration of the compressor motor can be minimized by controlling the speed of the compressor motor by performing proportional-integral control and ripple removal of the sensed speed from the compressor motor.

Further, the present invention can minimize the speed ripple and speed calculation by compensating the time delay of the calculation speed.

Further, the present invention can be applied to a low-cost microcomputer by minimizing the calculation amount of the inverter control unit.

Further scope of applicability of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and specific examples, such as the preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art.

1 is a block diagram illustrating a power conversion apparatus according to the present invention.
2 is a circuit diagram for explaining a power conversion apparatus according to the present invention.
3 is a block diagram illustrating an inverter control unit of the power conversion apparatus according to the present invention.
4 is a block diagram illustrating a speed control unit of the inverter control unit according to the first embodiment of the present invention.
5 is a block diagram illustrating a speed controller of the inverter controller according to the second embodiment of the present invention.
FIG. 6 is a diagram comparing the vibration of a compressor motor according to the prior art and the present invention.
FIGS. 7 and 8 are diagrams comparing computation times according to the prior art and the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

FIG. 1 is a block diagram for explaining a power conversion apparatus according to the present invention, and FIG. 2 is a circuit diagram for explaining a power conversion apparatus according to the present invention.

1 and 2, the power conversion apparatus 1000 includes a rectifying unit 1100 for rectifying the AC power source 100, a converter unit (not shown) for boosting / reducing the DC voltage rectified by the rectifying unit 1100, An inverter unit 1400 for outputting a three-phase AC current, an inverter control unit 1500 for controlling the inverter unit 1400, a converter unit 1200 for controlling the inverter unit 1200, And a DC stage capacitor C between the inverter section 1400 and the inverter section 1400.

This inverter unit 1400 outputs a three-phase alternating current, and this output current is supplied to the motor 2000. Here, the motor 2000 may be a compressor motor that drives the air conditioner. Hereinafter, the motor 2000 is a compressor motor that drives the air conditioner, and the power inverter 1000 is a motor driving device that drives such a compressor motor.

However, the motor 2900 is not limited to a compressor motor, and can be used in various applications using frequency-varying alternating voltage, for example, AC motors such as refrigerators, washing machines, electric trains, automobiles, and vacuum cleaners.

The power conversion apparatus 1000 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 to drive the compressor motor have.

The power conversion apparatus 1000 receives the AC power from the system, converts the power, and supplies the converted power to the motor 2000.

The converter unit 1200 converts the input AC power supply 100 into a DC power supply. The converter unit 1200 may use a DC-DC converter that operates as a power factor control (PFC) unit. In addition, such a DC-DC converter can use a boost converter. Optionally, converter 1200 may be a concept including rectifier 1100. Hereinafter, the converter unit 1200 will be described by way of example using a step-up converter.

The rectifying unit 1100 receives and rectifies the single-phase AC power source 100, and outputs the rectified power to the converter unit 1200 side. For this purpose, the rectifying unit 1100 can use a full-wave rectifying circuit using a bridge diode.

In this way, the converter unit 1200 can perform the power factor improving operation in the process of stepping up and smoothing the voltage rectified by the rectifying unit 1100.

The converter unit 1200 includes an inductor L1 connected to the rectifying unit 1100, a switching device Q1 connected to the inductor L1, a capacitor C connected in parallel with the switching device Q1, And a diode D1 connected between the switching element Q1 and the capacitor C. [

The converter unit 1200 is a step-up converter that can obtain an output voltage higher than the input voltage. When the switching device Q1 is turned on, the diode D1 is cut off and energy is stored in the inductor L1. The stored charge is discharged and an output voltage is generated at the output terminal.

Further, when the switching element Q1 is interrupted, the energy stored in the inductor L1 at the time of the switching element Q1 is added and is transferred to the output terminal.

Here, the switching device Q1 may perform a switching operation by a separate pulse width modulation (PWM) signal. That is, the PWM signal transmitted from the converter control unit 130 is applied to the base (or gate) terminal of the switching element Q1, so that the switching operation of the switching element Q1 can be driven by the PWM signal .

The switching element Q1 may use a power transistor, for example, an insulated gate bipolar mode transistor (IGBT).

The IGBT is a switching device having a structure of a metal oxide semi-conductor field effect transistor (MOSFET) and a bipolar transistor. The IGBT is a device capable of small driving power, high speed switching, high voltage conversion and high current density.

In this manner, the converter control unit 1300 can control the turn-on timing of the switching element Q1 in the converter unit 1200. [ Thus, the converter control signal Sc for the turn-on timing of the switching element Q1 can be output.

The converter control unit 1300 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 output voltage through the rectifying unit 1100 can be charged to the DC stage capacitor C or drive the inverter unit 1400. [

The input voltage detecting section A can detect the input voltage Vs from the input AC power supply 100. [ For example, it may be located at the front end of the rectifying part 1100.

The input voltage detecting section 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 1300 in order to generate the converter control signal Sc as a discrete signal in the form of a pulse.

Next, the input current detection section D can detect the input current Is from the input AC power supply 100. [ Specifically, it may be located at the front end of the rectifying section 1100.

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 1300 to generate the converter control signal Sc as a discrete signal in the form of a pulse.

The DC voltage detecting section B detects the pulsating voltage Vdc of the DC stage capacitor C. For such power detection, a resistance element, OP AMP, or the like can be used. The voltage Vdc of the detected DC stage capacitor C 1600 can be applied to the inverter control unit 1500 as a discrete signal in the form of a pulse and the DC voltage of the DC stage capacitor C The inverter control signal Si may be generated based on the inverter control signal Vdc.

On the other hand, unlike the drawing, the detected DC voltage is applied to the converter control section 1300, and may be used to generate the converter control signal Sc.

The inverter unit 1400 includes a plurality of inverter switching elements Qa, Qb, Qc, Qa ', Qb', and Qc ', and supplies the smoothed DC power source Vdc to a predetermined Phase three-phase alternating-current power source, and output to the three-phase motor 2000.

Specifically, the inverter unit 1400 includes a pair of upper switching elements Qa, Qb, and Qc and lower switching elements Qa ', Qb', and Qc 'that are serially connected to each other, and a total of three pairs of upper and lower The switching elements can be connected to each other in parallel.

The switching elements Qa, Qb, Qc, Qa ', Qb', and Qc 'of the inverter section may use power transistors and may be, for example, an insulated gate bipolar transistor transistor (IGBT) can be used.

The inverter control unit 1500 can output the inverter control signal Si to the inverter unit 1400 in order to control the switching operation of the inverter unit 1400. [ The inverter control signal Si is a switching control signal of the pulse width modulation method PWM and is used as a switching control signal for controlling the output current io flowing to the motor 2000 and the DC step voltage Vdc across the DC stage capacitor C Can be generated and output based on the above. The output current io at this time can be detected from the output current detection unit E and the DC short voltage Vdc can be detected from the DC voltage detection unit B. [

The output current detection section E can detect the output current io flowing between the inverter section 1400 and the motor 2000. [ That is, the current flowing in the motor 2000 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 detection unit E may be located between the inverter unit 1400 and the motor unit 2000. For current detection, a current transformer (CT), a shunt resistor, or the like may be used.

The inverter control unit 1500 may include a current sensing unit, a speed calculating unit, a speed control unit, a torque control unit, a current control unit, and a driving unit.

Here, the current sensing unit senses the current output from the inverter unit 1400, and the speed calculating unit can calculate the speed of the compressor motor 2000 based on the sensed current, and the speed control unit calculates the speed And the torque control unit can generate the d-axis target current and the q-axis target current based on the generated target current and the current sensed from the current sensing unit, The current control unit generates the target voltage based on the d-axis target current and the q-axis target current, and the driving unit can generate the driving signal based on the generated target voltage and drive the inverter unit 1400 according to the generated driving signal.

In addition, the speed control unit of the inverter control unit 1500 may include a proportional-integral controller (PI controller) and a resonance controller.

Here, the proportional-integral controller performs proportional-integral control based on the operation speed and the target speed, and the resonant controller is connected in parallel with the proportional-integral controller, and can remove the ripple component based on the operation speed and the target speed.

As an example, the resonant controller may be a controller having a gain at infinity and a phase delay of zero at the resonant frequency, but is not limited thereto.

In addition, the speed control section of the inverter control section 1500 may include a subtractor for calculating the difference between the computation speed and the target speed and outputting it to the proportional-integral controller and the resonance controller.

The speed control unit of the inverter control unit 1500 may include an adder for outputting the target current by summing the speed at which the proportional-integral control is performed from the proportional-integral controller and the speed at which the ripple component is removed from the resonant controller.

In addition, the speed control unit of the inverter control unit 1500 may further include a display year compensation filter that compensates for the time lag between the operation speed and the target speed and outputs the compensation to the resonance controller.

Here, the field annunciation compensation filter may be a 1st order all-pass filter, but is not limited thereto.

And, the display year compensation filter is connected in parallel with the proportional-integral controller and can be connected in series with the resonant controller.

Next, the speed computing unit of the inverter control unit 1500 may be a sensorless controller, but is not limited thereto.

Here, the speed calculator of the inverter controller 1500 estimates the rotor position of the compressor motor based on the sensed current, and outputs the estimated position signal to the current sensing unit.

The current sensing unit of the inverter control unit 1500 may sense the d-axis estimated current and the q-axis estimated current according to the received estimated position signal and output it to the torque control unit upon receiving the estimated position signal from the speed calculating unit.

The torque control unit of the inverter control unit 1500 can generate the d axis estimated current and the q axis estimated current from the current sensing unit based on the target current, and the d axis target current and the q axis target current, respectively.

Thus, the present invention minimizes the noise and vibration of the compressor motor by controlling the speed of the compressor motor by performing proportional-integral control and ripple removal of the sensed speed from the compressor motor.

Further, the present invention can minimize the speed ripple and speed calculation by compensating the time delay of the calculation speed.

Further, the present invention can be applied to a low-cost microcomputer by minimizing the calculation amount of the inverter control unit.

3 is a block diagram illustrating an inverter control unit of the power conversion apparatus according to the present invention.

3, the inverter control unit of the present invention includes a current sensing unit 1510, a speed calculating unit 1520, a speed control unit 1530, a torque control unit 1540, a current control unit 1550, and a driving unit 1560 ).

Here, the current sensing unit 1510 can sense the current output from the inverter unit 1400.

That is, the current sensing unit 1510 can sense the three-phase output currents ia, ib, and ic from the inverter unit 1400.

The current sensing unit 1510 receives the estimated position signal? E from the speed calculating unit 1520 and outputs the d-axis estimated current id and the q-axis estimated current iq according to the received estimated position signal? And outputs the sensed torque to the torque control unit 1540.

Next, the speed calculating section 1520 can calculate the speed of the compressor motor 2000 based on the sensed current.

Here, the speed calculator 1520 may be a sensorless controller, but is not limited thereto.

In one example, the sensorless controller can detect the speed of the compressor motor 2000 based on the sensed current information.

The speed calculating unit 1520 can estimate the rotor position of the compressor motor 2000 based on the sensed current and output the estimated position signal? E to the current sensing unit 1510. [

The speed controller 1530 may then perform proportional-integral control and ripple removal based on the computed computation speed ω ^ r and the target speed ω ^* r to generate the target current I ^* .

In one example, the speed controller 1530 may include a proportional-integral controller (PI controller) and a resonant controller.

Here, the proportional-integral controller performs proportional-integral control based on the operation speed (? R) and the target speed (? ^* R), the resonant controller is connected in parallel with the proportional- ) And the target speed ([omega] ^* r).

In this case, the resonance controller may be a controller having a gain of infinity at a resonance frequency and a phase delay of zero, but is not limited thereto.

The speed control unit 1530 may include a subtractor for calculating a difference between the computation speed ω ^ r and the target speed ω ^* r and outputting the computed difference to the proportional-integral controller and the resonance controller.

The speed controller 1530 may include an adder for adding the speed at which the proportional-integral control is performed from the proportional-integral controller and the speed at which the ripple component is removed from the resonant controller to output the target current I ^* .

As another example, the speed control unit 1530 may include a proportional-integral controller (PI controller), a resonant controller, and a field emission compensation filter.

Here, the display year compensation filter can output the target compensation value without time error by compensating the time delay of the computation speed (r) and the target speed (r ^* ) to the resonance controller.

The reason for disposing the sensor year compensation filter is that, in the case of the sensorless controller, since the current sensing time and the time to apply the sensed current to the controller are different, the current speed must include a time delay.

Here, the field annunciation compensation filter may be a 1st order all-pass filter, but is not limited thereto.

The phase compensation filter is connected in parallel with the proportional-integral controller and can be connected in series with the resonant controller.

Next, the torque controller 1540 compares the d-axis target current i ^* d and the q-axis target current i ^* q based on the generated target current I * and the current sensed by the current sensing unit 1510, Lt; / RTI >

That is, the torque control section 1540 is a target current (I ^*), the d-axis estimated current (id) and q-axis estimated current (iq), d-axis target current (i ^* d) sensed by the current sensing unit 1510, based on And the q-axis target current (i ^* q).

The current controller 1550 can generate the target voltages v ^* d and v ^* q based on the d-axis target current i ^* d and the q-axis target current i ^* q.

Subsequently, the driving unit 1560 generates the driving signals Sa, Sb, and Sc based on the generated target voltages v ^* d and v ^* q and outputs the driving signals Sa, (1400) can be driven.

Here, the generated drive signals Sa, Sb and Sc may be PWM signals having a predetermined duty.

Subsequently, the inverter section 1400 outputs the three-phase alternating current to drive the compressor motor 2000. [

Here, the actual speed? R of the compressor motor 2000 can be varied to the target speed? ^* R in accordance with the speed control of the inverter control unit.

As described above, the inverter control unit of the present invention can minimize the noise and vibration of the compressor motor by controlling the speed of the compressor motor by performing proportional-integral control and ripple removal of the sensed speed from the compressor motor.

The inverter control unit of the present invention can compensate the time delay of the operation speed, so that the speed ripple and the speed operation can be minimized.

Further, since the inverter control section of the present invention can minimize the amount of computation, it can be applied to a low-cost microcomputer, thereby minimizing the overall design cost.

FIG. 4 is a block diagram illustrating a speed controller of the inverter controller according to the first embodiment of the present invention, and FIG. 5 is a block diagram illustrating a speed controller of the inverter controller according to the second embodiment of the present invention.

4 and the speed control unit 1530 of the inverter control, as shown in Figure 5 is the calculated operation speed (ω ^ r) and the target speed (ω ^* r) based on proportional to - perform the integral control, and ripple removing target It is possible to generate the current I ^* .

4, the speed control unit 1530 according to the first embodiment may include a proportional-integral controller (PI controller) 1532, a resonant controller 1534, a subtractor 1535, and an adder 1536 have.

Here, the proportional-integral controller 1532 may perform proportional-integral control based on the computation speed (r) and the target speed (r ^* ).

The resonance controller 1534 is connected in parallel with the proportional-integral controller 1532 and can remove the ripple component based on the computation speed ω ^ r and the target speed ω ^* r.

At this time, the resonance controller 1534 may be a controller having a gain of infinity at a resonance frequency and a phase delay of zero, but is not limited thereto.

Subsequently, the subtracter 1535 can calculate the difference between the computation speed (r) and the target speed (r ^* ) and output it to the proportional-integral controller 1532 and the resonance controller 1534.

Next, the adder 1536 outputs the target current I ^* by summing the rate at which the proportional-integral control is performed from the proportional-integral controller 1532 and the rate at which the ripple component is removed from the resonance controller 1534 have.

As described above, the speed control unit of the first embodiment performs the proportional-integral control and the ripple removal together with the sensed speed from the compressor motor, so that the noise and vibration of the compressor motor can be minimized.

5, the speed control unit 1530 according to the second embodiment includes a proportional-integral controller (PI controller) 1532, a resonant controller 1534, a subtracter 1535, an adder 1536, Filter 1538. < / RTI >

That is, the speed control unit 1530 according to the second embodiment has a configuration in which the speed control unit 1530 according to the first embodiment adds a display year compensation filter 1538.

Here, the display year compensation filter 1538 compensates for the time lag between the computation speed (r) and the target speed (r ^* ) and outputs it to the resonance controller 1534 to output the target compensation value without time error can do.

The reason for disposing the field annihilation filter 1538 is that in the case of the sensorless controller, since the current sensing time and the time to apply the sensed current to the controller are different, the current speed must include a time delay.

Herein, the field annihilation filter 1538 may be a 1st order all-pass filter, but is not limited thereto.

The jerky compensation filter 1538 may be connected in parallel with the proportional-integral controller 1532 and in series with the resonant controller 1534.

As described above, the speed control unit of the second embodiment compensates the time delay of the operation speed through the display year compensation filter 1538, so that the speed ripple and the speed operation can be minimized.

FIG. 6 is a view for comparing vibration of a compressor motor according to the prior art and the present invention, and FIGS. 7 and 8 are diagrams for comparing computation time according to the prior art and the present invention.

As shown in FIG. 6, the power conversion apparatus of the present invention can minimize the vibration of the compressor motor and minimize the noise of the compressor motor due to the minimization of the vibration.

That is, the present invention can minimize the noise and vibration of the compressor motor, as compared with the prior arts which do not have a speed control section including the resonance controller and the field emission compensation filter as in the present invention.

Particularly, in the case of a single piston rotary compressor, noise and vibration due to low-speed operation are improved.

As described above, the present invention improves noise and vibration inevitably caused by the mechanical characteristics of the compressor, thereby reducing the mechanical additional cost for expanding the operating range of the product and reducing vibration.

Further, the present invention can improve user's convenience by improving the noise and vibration of the product.

That is, according to the present invention, unnecessary stimulation such as abnormal noise can be reduced to the user by improving the noise and vibration of the outdoor unit.

As shown in Figs. 7 and 8, the power conversion apparatus of the present invention can reduce the speed calculation time and the speed calculation amount.

That is, the present invention can minimize the speed calculation time and the speed calculation amount, as compared with the prior arts which do not have the speed control section including the resonance controller and the display year compensation filter as in the present invention.

As described above, the present invention can be applied to a high-performance vibration controller that can be driven by a low-cost and low-speed microcomputer.

The conventional pattern-based torque controller has a problem that the accuracy of the speed control is low and the performance difference is large depending on the peripheral load. The DOB (Disturbance Observer) type torque controller has a variable coefficient according to the compressor and a friction coefficient There is a problem that it is difficult to apply to a low-performance microcomputer because the computation is complicated.

However, the present invention can stably operate not only the torque of the compressor but also the ambient load fluctuation by using the resonance controller.

Further, since the delay of the controller depends only on the computation time, the present invention can be very small even when the motor or the compressor is changed, by applying the first-order full-band pass filter, which is a sensible annual compensation filter.

As described above, the present invention minimizes the noise and vibration of the compressor motor by controlling the speed of the compressor motor by performing proportional-integral control and ripple removal of the sensed speed from the compressor motor.

Further, the present invention can minimize the speed ripple and speed calculation by compensating the time delay of the calculation speed.

Further, the present invention can be applied to a low-cost microcomputer by minimizing the calculation amount of the inverter control unit.

The features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

1000: power converter 1100: rectifier
1200: converter section 1300: converter control section
1400: Inverter section 1500: Inverter control section
1510: current sensing unit 1520: speed calculating unit
1530: Speed control section 1540: Torque control section
1550: current control unit 1560:
2000: Motor

Claims (10)

An inverter unit for outputting a current for driving a compressor motor; And,
And an inverter control unit for controlling the inverter unit,
The inverter control unit includes:
A current sensing unit for sensing a current output from the inverter unit;
A speed calculating unit for calculating a speed of the compressor motor based on the sensed current;
A speed control unit for performing a proportional-integral control and a ripple removal on the basis of the computed computation speed and a target speed to generate a target current;
A torque control unit for generating a d-axis target current and a q-axis target current based on the generated target current and a current sensed from the current sensing unit;
A current controller for generating a target voltage based on the d-axis target current and the q-axis target current; And,
And a driving unit for generating a driving signal based on the generated target voltage and driving the inverter unit according to the generated driving signal,
Wherein the speed control unit comprises:
A proportional-integral controller for performing proportional-integral control based on the operation speed and the target speed;
A resonance controller connected in parallel with the proportional-integral controller, for removing the ripple component based on the operation speed and the target speed;
A subtracter for calculating a difference between the operation speed and the target speed and outputting the result to the proportional-integral controller and the resonant controller; And,
And an adder for outputting a target current by summing the speed at which the proportional-integral control is performed from the proportional-integral controller and the speed at which the ripple component is removed from the resonant controller. delete delete delete The resonator according to claim 1,
Wherein the gain is infinite at the resonant frequency and the phase delay is zero. The apparatus of claim 1,
And compensates for the computation speed and the time delay of the target speed and outputs the compensated signal to the resonance controller. 7. The apparatus of claim 6,
Wherein the first filter is a first order all-pass filter. 7. The apparatus of claim 6,
Wherein the power converter is connected in parallel with the proportional-integral controller, and is connected in series with the resonant controller. The apparatus according to claim 1,
Wherein the power converter is a sensorless controller. 11. An air conditioner comprising the power conversion device according to any one of claims 1 to 9.

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