KR102058042B1 - Power converter and air conditioner including the same - Google Patents

Abstract

The present invention relates to a power converter and an air conditioner having the same. The power conversion apparatus according to the embodiment of the present invention, an interleaved converter having a rectifying unit for rectifying the input AC power, a plurality of converters for converting the rectified power to a DC power, and outputs the converted DC power, and an interleaved converter And a converter control unit configured to control the control unit, wherein the first converter of the interleaved converter includes a first switching element of the first type, and the second converter of the interleaved converter includes a second type of higher rated voltage than the first type. 2 switching elements. This makes it possible to drive efficiently under various loads.

Description

Power converter, and air conditioner having the same {Power converter and air conditioner including the same}

The present invention relates to a power converter, and an air conditioner having the same, and more particularly, to a power converter that can be efficiently driven at various loads, and an air conditioner having the same.

An air conditioner is a device that is disposed in a room, a living room, an office, or a business store to adjust a temperature, humidity, cleanliness, and airflow of an air to maintain a comfortable indoor environment.

Air conditioners are generally divided into one-piece and separate types. The integrated type and the separated type are functionally the same, but the integrated type integrates the functions of cooling and heat dissipation to install a hole in the wall of the house or hang the device on the window, and the separate type installs an indoor unit that performs cooling / heating on the indoor side and outdoor. On the side, an outdoor unit that performs heat dissipation and compression functions was installed, and two separate devices were connected by refrigerant pipes.

On the other hand, as the requirements for high performance and high efficiency of air conditioners increase, various efforts have been made.

An object of the present invention is to provide a power converter that can be efficiently driven at various loads, and an air conditioner having the same.

According to an aspect of the present invention, there is provided a power converter including a rectifying unit for rectifying an input AC power source, and a plurality of converters for converting the rectified power source to a DC power source and outputting the converted DC power source. And an interleaved converter and a converter controller for controlling the interleaved converter, wherein the first converter of the interleaved converter includes a first switching element of the first type, and the second converter of the interleaved converter has a rated voltage higher than that of the first type. A second switching element of the second type is provided.

In addition, the air conditioner according to an embodiment of the present invention for achieving the above object comprises a compressor and a power conversion unit for supplying driving power to the motor in the compressor, the power conversion unit, rectification unit for rectifying the input AC power, rectification An interleaved converter having a plurality of converters for converting the supplied power to a DC power and outputting the converted DC power, and a converter control unit for controlling the interleaved converter, wherein the first converter of the interleaved converter is a first type of first type. One switching element is provided, and the second converter among the interleaved converters includes a second switching element of a second type having a higher rated voltage than the first type.

According to an embodiment of the present invention, a power converter and an air conditioner having the same include an interleaved converter, and a first converter among the interleaved converters includes a first switching element of a first type, The second converter includes a second switching element of the second type having a higher rated voltage than the first type, so that each switching element can be operated in response to various loads.

The operation efficiency can be improved by operating the first switching element with low load and low rated voltage, and by operating the second switching element with high load and high rated voltage, it is possible to operate stably even under high load.

In addition, by interleaving the first converter and the second converter during an intermediate load, input current ripple and noise can be reduced.

1 is a block diagram of an air conditioner according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a schematic view of the air conditioner of FIG. 1.
3 is an internal block diagram of a power converter of the outdoor unit of FIG. 1.
4 illustrates a circuit diagram of a converter in the power converter of FIG. 3.
FIG. 5 illustrates an internal block diagram of each converter controller of FIG. 4.
6 is a diagram illustrating a load region of a power converter.
7A to 7C are diagrams illustrating an operation of the power converter of FIG. 4.
8A to 8B are views referred to for describing the operation of the first converter of FIG. 4.
FIG. 9 illustrates a circuit diagram of an inverter in the power converter of FIG. 3.
FIG. 10 is an internal block diagram of the inverter controller of FIG. 9.

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

The suffixes "module" and "unit" for components used in the following description are merely given in consideration of ease of preparation of the present specification, and do not impart any particular meaning or role by themselves. Therefore, the "module" and "unit" may be used interchangeably.

1 is a block diagram of an air conditioner according to an embodiment of the present invention, Figure 2 is a view showing a schematic diagram of the air conditioner of Figure 1

Referring to the drawings, the air conditioner 100 includes an outdoor unit 150 and an indoor unit 170.

The outdoor unit 150 operates in the cooling mode or the heating mode in response to a request of the connected indoor unit 170 or an external control command, and supplies the refrigerant to the indoor unit 170.

To this end, the outdoor unit 150 includes a compressor 152 for compressing a refrigerant, a compressor electric motor 152b for driving the compressor, and an outdoor heat exchanger 154 for dissipating the compressed refrigerant. And an outdoor blower 155 which is disposed on one side of the outdoor heat exchanger 154 and includes an outdoor fan 155a for promoting heat dissipation of the refrigerant and an electric motor 5b for rotating the outdoor fan 155a, and the condensed refrigerant. The expansion mechanism 156 to expand, the cooling / heating switching valve 160 for changing the flow path of the compressed refrigerant, and the accumulator for temporarily storing the gasified refrigerant to remove moisture and foreign matter and then supplying a refrigerant of a constant pressure to the compressor. (153) and the like. The compressor 152 may be at least one of an inverter compressor and a constant speed compressor.

In addition, the outdoor unit 150 may further include at least one pressure sensor (not shown) for measuring the pressure of the refrigerant, at least one temperature sensor (not shown) for measuring the temperature, and the like.

The indoor unit 170 includes an indoor side heat exchanger 208 disposed indoors to perform a cooling / heating function, and an indoor fan 209a disposed on one side of the indoor side heat exchanger 208 to promote heat dissipation of the refrigerant; And an indoor blower 209 made of an electric motor 209b for rotating the indoor fan 209a. At least one indoor side heat exchanger 208 may be installed.

In addition, the indoor unit 170 may further include a discharge port (not shown) for discharging the heat-exchanged air, and a wind direction controller (not shown) for controlling the direction of the discharged air by opening and closing the discharge port (not shown). For example, a vane may be installed to open and close at least one of an air inlet (not shown) and an air outlet (not shown), and the vane may open and close the air inlet and the air outlet, And the direction of the discharged air.

On the other hand, the indoor unit 170, by controlling the intake air and discharged air in accordance with the rotational speed of the indoor fan 209a, it is possible to adjust the amount of air.

In addition, the indoor unit 170 may further include a display unit (not shown) for displaying the operation state and setting information of the indoor unit 170, and an input unit (not shown) for inputting setting data. The apparatus may further include an indoor temperature sensing unit (not shown) that senses an indoor temperature, a human body sensing unit (not shown) that detects a human body existing in an indoor space.

On the other hand, the air conditioner 100 may be configured as a cooler for cooling the room, or may be configured as a heat pump for cooling or heating the room.

In the drawings, the indoor unit 170 will be described as being an example of a stand type, but can also be a ceiling type or a wall-mounted type, and various forms such as an integrated type having no distinction between an outdoor unit and an indoor unit are possible.

On the other hand, between the indoor unit 170 and the outdoor unit 150 is connected to the refrigerant pipe, the cold air is discharged from the indoor unit 170 to the room in accordance with the circulation of the refrigerant. In this case, a plurality of indoor units 170 may be connected to one outdoor unit 150, and at least one indoor unit may be connected to each of the plurality of outdoor units.

In addition, the indoor unit 170 and the outdoor unit 150 may be connected with a communication line to transmit and receive a control command according to a predetermined communication method.

Meanwhile, the compressor 152 may be driven by driving power supplied through the following power converter 200. Specifically to the motor in compressor 152. The driving power from the power converter 200 may be supplied.

3 is an internal block diagram of the power converter of the outdoor unit of FIG. 1, and FIG. 4 illustrates a circuit diagram of the converter in the power converter of FIG.

Power converter 200 according to an embodiment of the present invention, the filter unit 403, rectifier 405, converter 410, converter control unit 415, capacitor (C), inverter 420, and inverter control unit 430 may be included.

The filter unit 403 may be disposed between the input AC power source 201 and the rectifier 405, and may filter harmonic currents generated by the input AC power source 201 or the power converter 200. To this end, the filter unit 403 may include an inductor as an inductive element, a capacitor as a capacitive element, and the like. For example, the filter unit 403 may include an LCL filter in which an inductor, a capacitor, and an inductor are disposed.

The rectifier 405 receives an input AC power source 201 that has passed through the filter unit 403 and rectifies the rectifier. 4 illustrates that the rectifier 405 for a single-phase AC power source uses four diodes Da, Db, Dc, and Dd in the form of a bridge, but various examples are possible.

The converter 410 converts the rectified power from the rectifier 405 into a direct current power and outputs it. In particular, it outputs to the capacitor (C) disposed at the output terminal of the converter (410).

In the embodiment of the present invention, as the converter 410, an interleaved converter having a plurality of converters 410a, 410b, ... is used. As an interleaved converter, an interleaved boost converter, an interleaved buck boost converter, an interleaved buck converter, and the like can be used. Hereinafter, the interleaved boost converter will be described.

The plurality of boost converters 410a, 410b, ... in the interleaved boost converter 410 are connected in parallel to each other to perform an interleaving operation. A plurality of boost converters are connected in parallel to each other to perform voltage control by interleaving, thereby enabling voltage control by current distribution. Accordingly, circuit element durability in the interleaved boost converter 410 may be improved. In addition, the ripple of the input current can be reduced.

Meanwhile, as the switching element used in the interleaved boost converter, a metal oxide semiconductor field effect transistor (MOSFET), an insulated gate bipolar mode transistor (IGBT), or the like may be used.

In an embodiment of the present invention, a MOSFET is used as a switching element in the first boost converter to perform high efficiency power conversion in a low load region and to enable stable driving in a high load region, and a second boost. It is assumed that IGBT is used as the switching element in the converter. An interleaved converter having such a configuration is illustrated as shown in FIG. 4.

4 illustrates a first boost converter 410a and a second boost converter 410b of the plurality of boost converters 410. Hereinafter, the first boost converter 410a and the second boost converter 410b of the plurality of boost converters 410 will be described.

The first boost converter 410a includes a first diode D1 having one end connected to the capacitor C, a first inductor L1 and a first inductor connected between the first diode D1 and the rectifier 405. The first boost switching device S1 may be connected to the L1 and the first diode D1 in parallel. In this case, the first boost switching device S1 may be a MOSFET switching device.

On the other hand, the second boost converter 410b includes a second diode D2, one end of which is connected to the capacitor C, a second inductor L2 connected between the second diode D2, and the rectifier 405, and a second one. The second boost switching device S2 may be connected to the second inductor L2 and the second diode D2 in parallel. In this case, the second boost switching device S2 may be an IGBT switching device.

The MOSFET switching element has the advantage of high operating speed and good efficiency in power conversion, but has a disadvantage in that its rated voltage is lower than that of the IGBT switching element, and its use is limited in the high load region.

On the other hand, the IGBT switching element has a high rated voltage and can be stably operated in a high load region than the MOSFET switching element, but has a disadvantage in that the efficiency at the time of power conversion is relatively low because the operation speed is slower than that of the MOSFET switching element.

When the power converter is used in a compressor of an air conditioner having a large load variation, when only one switching element is selected and used, it may be difficult to perform an operation that satisfies both the low load region and the high load region.

In the present invention, in order to improve this point, it is assumed that both the MOSFET switching element and the IGBT switching element are used. For this purpose, an interleaved converter is used, and each switching element is operated according to the load.

To this end, the converter controller 415 may include a low load region (AE1 of FIG. 6), a high load region (AE3 of FIG. 6), and an intermediate load region (of FIG. 6) according to a load corresponding to the voltage across the capacitor C. AE2) and controls the MOSFET switching element S1 in the first converter 410a in the low load region to operate only in the low load region, and in the high load region, the IGBT switching element in the second converter 410b in accordance with the load region. The MOSFET switching element S1 and the IGBT switching element S2 may be alternately controlled such that only S2 is operated and the first converter 410a and the second converter 410b are interleaved in the intermediate load region. have.

Meanwhile, the first boost converter 410a and the second boost converter 410b may be connected in parallel to each other and operate in a boost mode. The boost mode operation will be described later with reference to FIGS. 8A to 8B.

In addition, the power converter 200 outputs an input voltage detector A for detecting the output terminal voltage of the rectifier 405 and an output terminal voltage of the interleaved boost converter 410, that is, a voltage of the dc terminal capacitor C. The voltage detector B may further include a current detector F1 and F2 for detecting a current flowing through the inductor L1 and L2 in the interleaved boost converter 410.

The input voltage detector A may detect the output terminal voltage of the rectifier 405. To this end, the input voltage detector A may include a resistor, an amplifier, or the like. The detected input voltage V _c1 may be input to the converter controller 415 as a discrete signal in the form of a pulse.

The output voltage detector B, that is, the dc terminal voltage detector B, may detect the output terminal voltage of the interleaved boost converter 410. In particular, the voltage V _dc across the capacitor C may be detected.

The capacitor C is disposed between the inverter 420 and the load 205 and stores the output DC power of the interleaved converter. In the figure, one element is illustrated as the smoothing capacitor C, but a plurality of elements may be provided to ensure device stability. On the other hand, since the DC power is stored at both ends of the capacitor C, this may be referred to as a dc end or a dc link end.

Including an inverter 420 and a motor 205, the load 205 may be connected to both ends of the capacitor C of the power converter as shown in the figure. Accordingly, the dc terminal voltage V _dc may correspond to the voltage of the load 205. The detected output voltage V _dc may be input to the converter controller 415 as a discrete signal in the form of a pulse.

The first current detector F1 detects the current i _L1 flowing through the first inductor L1 in the first boost converter 410a, and the second current detector F2 detects the second boost converter 410b. The current i _L2 flowing in the second inductor L2 therein may be detected. To this end, a CT (current trnasformer), a shunt resistor, or the like may be used as the first and second current detectors F1 and F2. The detected input AC current i _L1 , i _L2 may be input to the converter controller 415 as a discrete signal in the form of a pulse.

The converter controller 415 may include a first converter controller 415a for controlling the first boost converter 410a and a second converter controller 415b for controlling the second boost converter 410b. .

The first converter control unit 415a loads the load based on the dc terminal voltage V _dc sensed by the output voltage detector B and the first inductor current I _L1 detected by the first current detector F1. Can be calculated. When the calculated load corresponds to the low load region, the turn on / turn off timing of the MOSFET switching element S1 in the first boost converter 410a may be controlled.

On the other hand, if the calculated load corresponds to the high load region, the first converter controller 415a may transfer the calculated load to the second converter controller 415b. Accordingly, the second converter controller 415b may control the turn on / turn off timing of the IGBT switching element S2 in the second boost converter 410b.

On the other hand, when the calculated load corresponds to the intermediate load region, the first converter controller 415a controls the turn on / turn off timing of the MOSFET switching element S1 in the first boost converter 410a, and the second converter. The calculated load may be transferred to the controller 415b. Accordingly, the second converter controller 415b may control the turn on / turn off timing of the IGBT switching element S2 in the second boost converter 410b.

On the other hand, unlike the above, the second converter controller 415b also has a dc terminal voltage V _dc sensed by the output voltage detector B and a second inductor current I detected by the second current detector F2. Based on _L2 ), the load amount can be calculated. If the calculated load corresponds to the high load region, the turn on / off timing of the IGBT switching element S2 in the second boost converter 410b may be controlled.

The inverter 420 includes a plurality of inverter switching elements, converts the smoothed DC power supply Vdc into three-phase AC power supplies va, vb, vc of a predetermined frequency by turning on / off an operation of the switching device, It can output to the synchronous motor 250. At this time, the motor 250 may be a motor in the compressor.

The inverter controller 430 outputs an inverter switching control signal Sic to the inverter 420 to control the switching operation of the inverter 420. The inverter switching control signal Sic is a switching control signal of the pulse width modulation method PWM, and is generated and output based on the output current value i _o detected from the output current detector E in FIG. 9.

FIG. 5 illustrates an internal block diagram of each converter controller of FIG. 4.

First, FIG. 5A illustrates an internal block diagram of the first converter controller 415a of FIG. 4. The first converter controller 415a may include a current command generator 310, a voltage command generator 320, and a switching control signal output unit 330.

The current command generator 310 generates a PI controller or the like based on the dc end voltage Vdc and the dc end voltage command value V ^* dc detected by the output voltage detector B, that is, the dc end voltage detector B. D, q-axis current setpoint (i ^* _d1 , i ^* _q1 ) can be generated.

The voltage command generation unit 320 generates a d, q-axis voltage command value v through a PI controller or the like based on the d, q-axis current command value i ^* _d1 , i ^* _q1 and the detected first input current i _L1 . ^* _d1 , v ^* _q1 )

The switching control signal output unit 330 drives the first converter switching control signal to drive the MOSFET switching element S1 in the first boost converter 410a based on the d, q-axis voltage command values v ^* _d1 and v ^* _q1 . (Scc1) is output to the first boost converter 410a.

As a result, the first converter controller 415a is based on the dc terminal voltage Vdc detected by the dc terminal voltage detector B and the first input current i _L1 detected by the first current detector F1. In the low load region, the first converter switching control signal Scc1 is output to the first boost converter 410a to drive the switching element S1.

Next, FIG. 5B illustrates an internal block diagram of the second converter controller 415b of FIG. 4. The second converter controller 415b may include a current command generator 315, a voltage command generator 325, and a switching control signal output unit 335.

The current command generation unit 315 performs a PI controller or the like based on the dc end voltage Vdc and the dc end voltage command value V ^* dc detected by the output voltage detector B, that is, the dc end voltage detector B. D, q-axis current setpoint (i ^* _d2 , i ^* _q2 ) can be generated.

The voltage command generator 325 controls the d, q-axis voltage command value v through a PI controller or the like based on the d, q-axis current command value i ^* _d2 , i ^* _q2 and the detected second input current i _L2 . ^* _d2 , v ^* _q2 )

The switching control signal output unit 335 may drive the second converter switching control signal to drive the IGBT switching element S2 in the second boost converter 410b based on the d, q-axis voltage command values v ^* _d2 and v ^* _q2 . (Scc2) is output to the second boost converter 410b.

As a result, the second converter controller 415b is based on the dc terminal voltage Vdc detected by the dc terminal voltage detector B and the second input current i _L2 detected by the second current detector F2. In the high load region, the second converter switching control signal Scc2 is output to the second boost converter 410b to drive the IGBT switching element S2.

6 is a diagram illustrating a load region of a power converter.

The first converter controller 415a or the second converter controller 415b is detected by the dc terminal voltage Vdc detected by the dc terminal voltage detector B and the first and second current detectors F1 and F2. Based on the first and second input currents i _L1 and i _L2 , a load amount across the capacitor may be calculated. At this time, the load may mean power.

When the level of the calculated load amount is equal to or less than the first power level Pa, the first converter control section 415a or the second converter control section 415b determines that the load is low and the level of the calculated load amount is the second power level ( If Pb) or more, it is determined as a high load, and when the level of the calculated load amount is between the first power level Pa and the second power level Pb, it may be determined as an intermediate load.

Accordingly, each of the low load region Ae1, the middle load region Ae2, and the high load region Ae3 may be divided. Meanwhile, the first power level Pa and the second power level Pb at this time may be stored in a memory (not shown) in the power converter 200.

In addition, the 1st power level Pa and the 2nd power level Pb are variable according to an operation condition. For example, when the maximum load used for a certain period is less than or equal to a predetermined value, the first power level Pa and the second power level Pb may be lowered.

7A to 7C are diagrams illustrating an operation of the power converter of FIG. 4.

First, FIG. 7A illustrates that only the first boost converter 410a operates in the low load region.

The first converter controller 415a or the second converter controller 415b determines that the load is less than or equal to the first load level Pa and determines that only the first boost converter 410a operates. Can be.

The MOSFET switching element S1 in the first boost converter 410a is turned on by the first converter switching control signal Scc1 from the first converter controller 415a. As a result, current is accumulated in the first inductor, and energy stored in the first inductor is transferred to the capacitor C when the MOSFET switching element S1 is turned off.

In this way, by operating the MOSFET switching element S1 having a low rated voltage at low load, the operation efficiency can be improved.

Next, FIG. 7B illustrates the operation of the first boost converter 410a and the second boost converter 410b in the intermediate load region.

When the calculated load range is between the first power level Pa and the second power level Pb, the first converter control unit 415a or the second converter control unit 415b determines that the load is an intermediate load, and thus the first boost. The converter 410a and the second boost converter 410b may be controlled to interleave.

The MOSFET switching element S1 in the first boost converter 410a is turned on by the first converter switching control signal Scc1 from the first converter controller 415a. In this case, the IGBT switching element S2 in the second boost converter 410b may be turned off.

Next, when the MOSFET switching element S1 is turned off, the IGBT switching element S2 in the second boost converter 410b is turned on by the second converter switching control signal Scc2 from the second converter control unit 415b. Will come on.

In this way, by interleaving the first boost converter 410a and the second boost converter 410b during the intermediate load, input current ripple and noise can be reduced.

Next, FIG. 7C illustrates that only the second boost converter 410b operates in the high load region.

The first converter controller 415a or the second converter controller 415b may determine a high load when the calculated load range is greater than or equal to the second power level Pb, and control only the second boost converter 410b to operate. have.

The IGBT switching element S2 in the second boost converter 410b is turned on by the first converter switching control signal Scc2 from the second converter controller 415b. As a result, current is accumulated in the second inductor L2, and when the IGBT switching element S2 is turned off, the energy accumulated in the second inductor is transferred to the capacitor C. FIG.

In this way, by operating the IGBT switching element S2 having a high rated voltage at high load, it is possible to operate stably even at high load.

As a result, by using a heterogeneous type of switching element and driving for each load, the power converter can be efficiently driven under various loads. In particular, it is possible to efficiently drive a compressor or the like having a large load variation.

8A to 8B are views referred to for describing the operation of the first converter of FIG. 4.

8A and 8B illustrate that the first boost converter 410a operates in a boost mode.

8A illustrates a closed loop formed by the first inductor L1 and the first boost switching element S1 when the first boost switching element S1 in the first boost converter 410a is turned on. Illustrates (Ia) flowing. As a result, energy based on the current Ia is accumulated in the first inductor L1. At this time, the first diode D1 does not conduct.

8B illustrates that when the first boost switching element S1 in the first boost converter 410a is turned off, the first diode D1 conducts, so that the first inductor L1 and the first diode D1 are turned on. It illustrates that the current Ib flows through. The current Ib may be the sum of the energy accumulated in the first inductor L1 and the current based on the input AC power supply 201 in FIG. 8A.

That is, the first boost switching element S1 in the first boost converter 410a is turned on / off operation, that is, PWM operation.

Since the operation of the second converter is the same as that of FIGS. 8A to 8B, description thereof will be omitted.

FIG. 9 illustrates a circuit diagram of an inverter in the power converter of FIG. 3.

Inverter 420 is a pair of upper arm switching elements Sa, Sb, Sc and lower arm switching elements S'a, S'b, S'c, which are connected in series with each other, and a total of three pairs of upper and lower arms The switching elements are connected in parallel with each other (Sa & S'a, Sb & S'b, Sc & S'c). Diodes are connected in anti-parallel to each of the switching elements Sa, S'a, Sb, S'b, Sc, and S'c.

The switching elements in the inverter 420 perform on / off operations of the respective switching elements based on the inverter switching control signal Sic from the controller 430.

The inverter 420 drives the motor 250 by converting the DC power across the capacitor C into AC power in the motor 250 operation mode.

The inverter controller 430 may control to control the operation of the switching element in the inverter 420. To this end, the inverter controller 430 may receive an output current i _o detected by the output current detector E of FIG. 9.

The inverter controller 430 outputs an inverter switching control signal Sic to the inverter 420 to control the switching operation of the inverter 420. The inverter switching control signal Sic is a switching control signal of the pulse width modulation method PWM, and is generated and output based on the output current value i _o detected from the output current detector E in FIG. 9.

The output current detector (E of FIG. 9) can detect the output current i _o flowing between the inverter 420 and the three-phase motor 250. That is, the current flowing through the motor 250 is detected. The output current detector E may detect all of the output currents ia, ib, and ic of each phase, or may detect the output currents of two phases by using three-phase equilibrium.

The output current detector E may be located between the inverter 420 and the motor 250, and a current trnasformer (CT), a shunt resistor, or the like may be used for current detection.

When a shunt resistor is used, three shunt resistors are located between the inverter 420 and the synchronous motor 250 or the three lower arm switching elements S'a, S'b, S'c of the inverter 420. It is possible to connect one end to each). On the other hand, it is also possible to use two shunt resistors using three-phase equilibrium. On the other hand, when one shunt resistor is used, the corresponding shunt resistor may be disposed between the above-described capacitor C and the inverter 420.

The detected output current i _o may be applied to the controller 430 as a discrete signal in the form of a pulse, and the inverter switching control signal Sic may be applied based on the detected output current i _o . Is generated. In the following description, it is assumed that the detected output current i _o is the three-phase output current (ia, ib, ic).

FIG. 10 is an internal block diagram of the inverter controller of FIG. 9.

Referring to FIG. 10, the inverter controller 430 may include an axis converter 310, a speed calculator 320, a current command generator 330, a voltage command generator 340, an axis converter 350, and The switching control signal output unit 360 may be included.

The axis conversion unit 310 receives the three-phase output currents (ia, ib, ic) detected by the output current detection unit E, and converts the two-phase currents i α and i β of the stationary coordinate system.

On the other hand, the axis conversion unit 310 can convert the two-phase current (iα, iβ) of the stationary coordinate system into the two-phase current (id, iq) of the rotary coordinate system.

)를 연산할 수 있다. 즉, 위치 신호에 기반하여, 시간에 대해, 나누면, 속도를 연산할 수 있게 된다.The speed calculator 320 may calculate the speed (based on the position signal H of the rotor input from the position detector 235).

) Can be calculated. That is, based on the position signal, when divided over time, the velocity can be calculated.

On the other hand, the position detector 235 may detect the rotor position of the motor 250. To this end, the position sensor 235 may include a hall sensor.

)와 연산된 속도(

)를 출력할 수 있다.On the other hand, the speed calculator 320 calculates the position calculated based on the input position signal H of the rotor (

) And computed 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(330)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 330 has a calculation speed (

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

PI control may be performed in the PI controller 535 based on the speed command value ω ^* _r , which is a difference between the target speed ω and the target speed ω, and a current command value i ^* _q may be generated. In the drawing, although the q-axis current command value i ^* _q is illustrated as a current command value, it is also possible to generate | generate a d-axis current command value i ^* _d unlike a 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 generation unit 330 may further include a limiter (not shown) for restricting the level so that the current command value i ^* _q does not exceed the allowable range.

Next, the voltage command generation unit 340 includes the d-axis and q-axis currents i _d and i _q which are axis-converted in the two-phase rotational coordinate system by the axis conversion unit, and the current command value (such as the current command generation unit 330). Based on i ^* _d , i ^* _q ), the d-axis and q-axis voltage command values v ^* _d and v ^* _q are generated. For example, the voltage command generation unit 340 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 , and q The axial voltage setpoint v ^* _q can be generated. In addition, the voltage command generation unit 340 performs the 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 d-axis voltage. The setpoint (v ^* _d ) can be generated. On the other hand, 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 zero.

On the other hand, the voltage command generation unit 340 may further include a limiter (not shown) for restricting the level so that the d-axis and q-axis voltage command values (v ^* _d , v ^* _q ) do not exceed the allowable range. .

On the other hand, the generated d-axis and q-axis voltage command values v ^* _d and v ^* _q are input to the axis conversion unit 350.

)와, d축, q축 전압 지령치(v^* _d,v^* _q)를 입력받아, 축변환을 수행한다.The axis conversion unit 350 may be a position calculated by the speed calculating unit 320 (

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

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

) Can be used.

In addition, the axis conversion unit 350 performs a transformation from the two-phase stop coordinate system to the three-phase stop coordinate system. Through this conversion, the axis conversion unit 1050 outputs the three-phase output voltage command values v ^* a, v ^* b, v ^* c.

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

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

The power converter according to the embodiment of the present invention, and the air conditioner having the same, is not limited to the configuration and method of the embodiments described as described above, the embodiments so that various modifications can be made All or some of the embodiments may be selectively combined.

On the other hand, the operating method of the charging device of the present invention can be implemented as a processor-readable code on a processor-readable recording medium provided in the charging device. The processor-readable recording medium includes all kinds of recording devices that store data that can be read by the processor.

In addition, while the above has been shown and described with respect to preferred embodiments of the present invention, the present invention is not limited to the specific embodiments described above, the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

Claims (16)

Rectifier for rectifying the input AC power;
An interleaved converter having a plurality of converters for converting the rectified power source into DC power and outputting the converted DC power; And
A converter controller for controlling the interleaved converter;
And a capacitor connected to an output terminal of the interleaved converter.
A first converter of the interleaved converter includes a first switching element of a first type, and a second converter of the interleaved converter includes a second switching element of a second type having a higher rated voltage than the first type. ,
The converter control unit,
When the level of the load corresponding to both ends of the capacitor is equal to or less than the first level, the operation of the first switching element of the first converter is controlled;
When the level of the load corresponding to both ends of the capacitor is greater than or equal to the second level greater than the first level, the operation of the second switching element of the second converter is controlled;
And the first level and the second level are lowered when the maximum load used for a predetermined period is less than or equal to a predetermined value. The method of claim 1,
The converter control unit,
And controlling the operation of the interleaved converter in accordance with a load corresponding to both ends of the capacitor. delete The method of claim 1,
The converter control unit,
When the level of the load corresponding to both ends of the capacitor is between the first level and the second level, the operation of the first and second switching elements of the first and second converters are respectively controlled. Power inverter. The method of claim 4, wherein
The converter control unit,
And controlling the interleaved operation of the first and second converters during the operation control of the first and second switching elements. The method of claim 1,
The first converter of the interleaved converter,
A first inductor connected to the rectifier;
A first diode connected to an output terminal of the interleaved converter;
The first switching element connected in parallel between the first inductor and the first diode;
The second converter of the interleaved converter,
A second inductor connected to the rectifier;
A second diode connected to an output terminal of the interleaved converter;
And the second switching element connected in parallel between the second inductor and the second diode. The method of claim 1,
A capacitor connected to an output terminal of the interleaved converter;
And an inverter connected between the capacitor and the motor and converting the output power of the converter to AC power. The method of claim 1,
A capacitor connected to an output terminal of the interleaved converter; And
And a voltage detector for detecting a voltage across the capacitor.
The converter control unit,
And controlling the operation of the interleaved converter based on the voltage across the detected capacitor. The method of claim 1,
A capacitor connected to an output terminal of the interleaved converter; And
And a voltage detector for detecting a voltage across the capacitor.
The converter control unit,
A load amount connected to the power converter is calculated based on at least one of a current flowing through the first inductor in the first converter and a current flowing through the second inductor in the second converter and a voltage across the detected capacitor. And controlling the operation of the interleaved converter based on the calculated load amount. The method of claim 1,
The converter control unit,
A first converter controller for controlling the first converter,
And a second converter controller for controlling the second converter. The method of claim 1,
And the first switching element comprises a metal oxide semiconductor field effect transistor, and the second switching element comprises an insulated gate bipolar transistor. compressor;
And a power conversion unit supplying driving power to a motor in the compressor.
The power converter,
Rectifier for rectifying the input AC power;
An interleaved converter having a plurality of converters for converting the rectified power source into DC power and outputting the converted DC power; And
A converter controller for controlling the interleaved converter;
And a capacitor connected to an output terminal of the interleaved converter.
A first converter of the interleaved converter includes a first switching element of a first type, and a second converter of the interleaved converter includes a second switching element of a second type having a higher rated voltage than the first type. ,
The converter control unit,
When the level of the load corresponding to both ends of the capacitor is equal to or less than the first level, the operation of the first switching element of the first converter is controlled;
Controlling the operation of the second switching element of the second converter when the level of the load corresponding to both ends of the capacitor is greater than or equal to the second level greater than the first level,
And the first level and the second level are lowered when the maximum load used for a predetermined period is less than or equal to a predetermined value. delete The method of claim 12,
The converter control unit,
When the level of the load corresponding to both ends of the capacitor is between the first level and the second level, the operation of the first and second switching elements of the first and second converters are respectively controlled. Air conditioner. The method of claim 12,
The first converter of the interleaved converter,
A first inductor connected to the rectifier;
A first diode connected to an output terminal of the interleaved converter;
The first switching element connected in parallel between the first inductor and the first diode;
The second converter of the interleaved converter,
A second inductor connected to the rectifier;
A second diode connected to an output terminal of the interleaved converter;
And the second switching element connected in parallel between the second inductor and the second diode. The method of claim 12,
The power converter,
A capacitor connected to an output terminal of the interleaved converter; And
And a voltage detector for detecting a voltage across the capacitor.
The converter control unit,
Calculate a load amount connected to the power converter based on at least one of a current flowing through a first inductor in the first converter and a current flowing through a second inductor in the second converter and a voltage across the detected capacitor And control the operation of the interleaved converter based on the calculated load amount.

Images