KR101299502B1 - Multi-type Air conditioner and the controlling method - Google Patents

Abstract

In the multi-type air conditioner according to the present invention and a control method thereof, the present invention comprises the steps of measuring the temperature of the power device for supplying the operating frequency to the compressor to enable continuous operation without turning off the air conditioner product in accordance with external influences And determining whether the temperature of the power device is within the first limiting temperature range, and if the determination result is the first limiting temperature range, stopping the increase of the operating frequency to lower the temperature of the power device. It provides a control method of a multi-type air conditioner comprising a.

Power elements, limit current

Description

Multi-type air conditioner and its controlling method

1 is a block diagram showing an outdoor unit of the multi-type air conditioner according to the present invention.

2 is a control block diagram showing the configuration of a multi-type air conditioner according to the present invention.

3 is a control graph of the multi-type air conditioner according to the first embodiment of the present invention.

4 is a flowchart illustrating a control method of a multi-type air conditioner according to a first embodiment of the present invention.

5 is a control graph of a multi-type air conditioner according to a second embodiment of the present invention.

6 is a flowchart illustrating a control method of a multi-type air conditioner according to a second embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

100: power supply unit 110: compressor driving unit

111: inverter section 112: power element

120: measuring unit 121: temperature measuring unit

122: current measuring unit 130: control unit

The present invention relates to a multi-type air conditioner and a control method thereof. More particularly, the present invention relates to a multi-type air conditioner and a control method thereof, which can be continuously operated without turning off the air conditioner product according to an external influence.

In general, an air conditioner has been mainly used as a cooling device that discharges cold air generated through heat exchange with ambient air due to evaporation of a refrigerant to a room by using a fan by compressing, evaporating, and condensing a predetermined refrigerant.

In addition, the air conditioner utilizes a compression, evaporation, and condensation cycle of the refrigerant as a reverse to discharge hot air generated through heat exchange between the refrigerant due to the refrigerant's condensation and the surrounding air to the room using a fan. As dual-use air conditioners are widely used, air conditioners are being used as devices to control the indoor temperature of the home throughout the four seasons.

Conventional air conditioners raise or lower the operating frequency applied to the compressor based on the limiting temperature of the power element. In this case, the power device increases the operating frequency when the temperature is lower than the limit temperature and decreases the operating frequency when the power element is higher than the limit temperature.

However, the air conditioner according to the related art has a problem in that when the temperature of the power element is maintained below the limit temperature, the air conditioner product is turned off to block the operating frequency supplied to the compressor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-type air conditioner and a method of controlling the same, which can be continuously operated without turning off the air conditioner product according to external influences.

The multi-type air conditioner according to the present invention includes a power element for applying an operating frequency to an inverter compressor, a measuring unit for measuring an operating current based on the operating frequency and a temperature of the power element, and a temperature of the operating current and the power element. Based on any one of the, includes a control unit for controlling the driving frequency.

A control method of a multi-type air conditioner according to a first embodiment of the present invention includes the steps of measuring a temperature of a power device for supplying an operating frequency to a compressor, and whether the temperature of the power device falls within a first limit temperature range. And determining if the result is the first limiting temperature range, and stopping the increase of the operating frequency to lower the temperature of the power device.

In addition, the control method of the multi-type air conditioner according to the second embodiment of the present invention comprises the steps of measuring the current supplied to the power element for supplying the operating frequency to the compressor, and whether the current falls within the first limited current range Determining whether or not, and if the determination result is the first limited current range, operating the compressor by maintaining the operating frequency.

Hereinafter, a multi-type air conditioner and a control method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing an outdoor unit of the multi-type air conditioner according to the present invention.

Referring to FIG. 1, the multi-type air conditioner of the present invention includes a plurality of outdoor units connected to a plurality of indoor units, and the plurality of outdoor units includes a plurality of compressors. Here, the plurality of compressors will be described as having two compressors.

The multi-type air conditioner of the present invention includes a plurality of indoor units (11, 12, 13, 14), and outdoor units (21, 22) connected to the plurality of indoor units (11, 12, 13, 14).

Here, the plurality of indoor units (11, 12, 13, 14) and the outdoor unit (21, 22) is connected via a refrigerant pipe, the outdoor unit (21, 22) is at least one of the indoor unit (11, 12, 13, 14). Driven by the demand of, and as the cooling / heating capacity required by the indoor units 11, 12, 13, 14 increases, the operation number of the outdoor units 21, 22 and the operation number of the compressors installed in the outdoor units 21, 22 are increased. Increases.

The indoor units 11, 12, 13, and 14 include an indoor heat exchanger 51 for exchanging refrigerant and indoor air, an indoor blower 52 installed near the indoor heat exchanger 51 for circulating indoor air, and cooling. It includes an indoor expansion valve 54 for expanding the refrigerant flowing to the indoor heat exchanger (51).

The outdoor units 21 and 22 include an accumulator 61 which extracts only a gas refrigerant from the refrigerants supplied from the indoor units 11, 12, 13, and 14, and an inverter compressor that receives and compresses the gas refrigerant extracted from the accumulator 61. 62) and the constant speed compressor 63, the four-way valve 65 connected to the compressors 62 and 63 to select the compressed refrigerant flow path, and the outdoor to heat-exchange the refrigerant supplied from the four-way valve 65 and the outdoor air. Heat exchanger 70.

Here, the outdoor unit (21, 22) is provided with an inverter compressor (62) and a constant speed compressor (63), the inverter compressor (62) is a compressor that can vary the compression capacity of the refrigerant, the constant speed compressor (63) Compressor with constant compression capacity.

On the other hand, the oil separator 64 is installed in the pipe connecting the compressors 62 and 63 and the four-way valve 65, and the oil separator 64 is connected to the suction side of the compressors 62 and 63.

In particular, the oil separator 64 separates the oil from the refrigerant discharged from the compressors 62 and 63, and supplies the separated oil to the compressors 62 and 63, thereby providing an appropriate amount of oil in the compressors 62 and 63. Keep it. Then, the suction side pipes of the oil separator 64 and the compressors 62 and 63 are connected through the capillary tube 66, and the oil is moved through the capillary tube 66.

In addition, the refrigerant pipes guiding the refrigerant discharged from the outdoor heat exchanger 70 to the indoor heat exchanger 51 include outdoor electromagnetic expansion valves lev and 74 for expanding the refrigerant during heating, and an indoor heat exchanger 51 for cooling. Sub-cooling device 80 for cooling the refrigerant moved to the, and the liquid injection device 90 for lowering the temperature of the first and second compressors (62, 63) is provided.

Here, the outdoor electromagnetic expansion valve 74 is fully open during cooling to allow the refrigerant condensed in the outdoor heat exchanger 70 to pass through without expansion, but when heated, it is opened to a predetermined size and condensed in the indoor heat exchanger 51. Before expanding to the outdoor heat exchanger (70) to the liquid in the spray state.

Here, the indoor electromagnetic expansion valve 54 and the outdoor electromagnetic expansion valve 74 is provided with a step motor (not shown) therein, and operates under control from a controller (not shown).

At this time, during the cooling and heating, the step motors of the indoor electromagnetic expansion valve 54 and the outdoor electromagnetic expansion valve 74 operate under the control of the controller.

2 is a control block diagram showing the configuration of a multi-type air conditioner according to the present invention.

Referring to FIG. 2, the multi-type air conditioner of the present invention is a power supply unit 100 for supplying power, and a compressor driver 110 for driving the inverter compressor 62 and the constant speed compressor 63 by receiving power from the power supply unit 100. And a control unit 130 connected to the compressor driving unit 110 to control the compressor driving unit 110 based on the measurement unit 120 and the temperature and current measured by the measuring unit 120. Include.

Here, the compressor driving unit 110 converts power input from the power supply unit 100 into driving voltages of the inverter compressor 62 and the constant speed compressor 63 and at least one switching based on the driving voltage. The device includes a power device 112 that switches and applies an operating frequency to at least one of the inverter compressor 62 and the constant speed compressor 63.

That is, the inverter unit 111 rectifies and smoothes the power input from the power supply unit 100 to output a direct current output voltage, and a constant voltage corresponding to the predetermined reference voltage. A constant voltage circuit unit (not shown) for outputting and a converter (not shown) for converting the constant voltage into the driving voltage.

The rectification smoothing unit performs full-wave rectification of the power to output a DC voltage, and removes a ripple component from the DC voltage to output the DC output voltage.

In addition, the constant voltage circuit unit outputs the constant voltage corresponding to the predetermined reference voltage even when the DC output voltage is changed to be above or below a predetermined reference voltage.

Here, the power device 112 includes at least one of at least one IPM or PFCM, and supplies the operating frequency to the inverter compressor 62 or the constant speed compressor 63 based on the driving voltage.

That is, the power device 112 includes at least one switch (not shown) therein, and the operating frequency is changed to either the inverter compressor 62 or the constant speed compressor 63 according to the switching operation of the at least one switch. Supplied.

Herein, the power element 112 may increase in temperature according to the internal heat generated by the switching operation of the at least one switch, and the operating frequency according to the first limit temperature range and the second limit temperature range set in the controller 130. The supply of is controlled.

That is, when the operating frequency rises, the heat generation of the power element 112 increases in temperature by rapidly switching on / off operation of the at least one switch.

The measuring unit 120 includes a temperature measuring unit 121 including at least one sensor (not shown) measuring a temperature of the power element 112, and a current measuring unit measuring a current supplied to the inverter compressor 62. (122).

Here, the temperature measuring unit 121 is located on the outer side or the inner side of the power element 112 to measure the temperature for the internal heat generated by the power element 112 to apply to the controller 130.

In addition, the current measuring unit 122 measures a change in the current supplied to the inverter compressor 62 and applies it to the controller 130.

The controller 130 controls the compressor driving unit 110 by receiving the temperature of the power element 112 measured by the temperature measuring unit 121 and the current supplied to the inverter compressor 62 measured by the current measuring unit 122. do.

Here, the controller 130 controls the on and off and the operating frequency of the inverter compressor 62 based on at least one of the temperature and current input through the temperature measuring unit 121 or the current measuring unit 122.

Hereinafter, the control of the operating frequency applied to the inverter compressor 62 according to the temperature of the power element 112 and the current supplied to the inverter compressor 62 will be described.

The first embodiment describes that the operating frequency is controlled in accordance with the temperature of the power element.

The controller 130 receives the temperature of the power device 112 from the temperature measuring unit 121 and compares it with the set first and second limit temperatures.

In this case, the controller 130 increases the operating frequency supplied to the inverter compressor 62 when the temperature of the power device 112 is lower than the first limit temperature, and increases the operating frequency when the temperature of the power element 112 is lower than the first limit temperature. It maintains the present and stops raising the said operating frequency when it is higher than the said 1st limit temperature.

Here, the controller 130 stops the increase of the operating frequency when the temperature is higher than the first limit temperature, and turns off the inverter compressor 62 when the temperature is higher than the second limit temperature.

That is, the controller 130 turns off the inverter compressor 62 only when the temperature of the power element 112 is higher than the second limit temperature, and the operation of the air conditioner is continued.

Here, it is preferable that the said 1st limiting temperature range is 73 degreeC-75 degreeC or more and 77 degreeC-79 degreeC or less, and the said 2nd limiting temperature range is 79 degreeC-80 degreeC or more and 84 degreeC-86 degreeC or less. That is, when the internal heat generation temperature of the power element 121 is equal to or greater than the second limit temperature, the operation frequency is applied to the inverter compressor 62, and malfunction and damage are caused.

The second embodiment describes that the operating frequency is controlled in accordance with the current supplied to the inverter compressor.

The controller 130 controls the operating frequency applied to the inverter compressor 62 by comparing the current measured from the current measuring unit 122 with the set first limit current range.

Here, the controller 130 increases the operating frequency when the current is lower than the first limited current range, maintains the operating frequency in a current state when the current falls within the first limited current range, and the second limited current range. If it is in the range, the operating frequency is lowered, and if it is higher than the second limit current range, the inverter compressor 62 is controlled to be turned off.

That is, the first limit current range is 10 amps (A) or more and 11 amps (A) or less, and the second limit current range is 11 amps (A) or more and 13 amps (A) or less.

Herein, the controller 130 turns off the inverter compressor 62 when the current is higher than the second limit current range and is lower than a predetermined predetermined frequency. That is, the predetermined frequency is preferably 14Hz to 16Hz.

The air conditioner according to the present invention controls the operating frequency of the inverter compressor based on the temperature of the power element and the current supplied to the inverter compressor according to the first and second embodiments, without turning off the air conditioner product, By lowering the operating frequency or turning off the inverter compressor, continuous operation is possible without turning off the air conditioner product even if there are any restrictions on the exterior.

3 is a control graph of the multi-type air conditioner according to the first embodiment of the present invention, and FIG. 4 is a flowchart illustrating a control method of the multi-type air conditioner according to the first embodiment of the present invention.

Referring to FIG. 3, in the multi-type air conditioner of the present invention, the temperature of the power element 121 measured from the temperature measuring unit 121 is transmitted to the control unit 130, and the control unit 130 controls the temperature of the power element 121. The operating frequency applied to the inverter compressor 62 is controlled accordingly.

That is, when the temperature of the power element 112 is less than or equal to the first limit temperature, the controller 130 controls the inverter compressor 62 to operate by raising the operating frequency applied to the inverter compressor 62 to a set frequency. .

In addition, the controller 130 may apply the current to the inverter compressor 62 when the temperature of the power element 112 is in a first limiting temperature range, that is, a range higher than the first limiting temperature and lower than the second limiting temperature. The operating frequency is maintained to control the temperature of the power element 112 to be lowered.

If the temperature of the power element 112 is in the second limit temperature range, that is, the range higher than the second limit temperature and lower than the third limit temperature, the controller 130 lowers the operating frequency and applies it to the inverter compressor 62. Control to maintain the operating frequency when the temperature is lowered to the first limit temperature range.

When the temperature of the power element 112 is higher than the third limit temperature, the controller 130 controls the inverter compressor 62 not to apply the operating frequency, and the temperature of the power element 112 is within the first limit temperature range. When lowered to control to lower the operating frequency to the first limit temperature.

3 and 4, the multi-type air conditioner of the present invention measures the temperature T of a power element to which an operating frequency is applied during operation of the inverter compressor (S100).

That is, the controller 130 controls the driving frequency to be applied through the power device 112 to operate the inverter compressor 62, and controls the temperature measuring unit 121 to measure the temperature change of the power device 112. .

In addition, the power device 112 transmits the measured temperature T of the power device 112 to the controller 130.

The measured temperature T of the power device is compared with the set first limiting temperature (S112). When the temperature T of the power device is lower than the first limiting temperature, the operating frequency is increased (S114).

That is, when the temperature T of the power element 112 is lower than the set first limit temperature, the controller 130 controls the power element 112 to be applied to the inverter compressor 62 by raising the operating frequency.

Comparing and determining whether the temperature T of the power device is higher than the first limiting temperature range, that is, higher than the first limiting temperature and lower than the second limiting temperature (S116). (S118).

That is, the controller 130 is operated when the temperature T of the power element 112 is higher than the first limiting temperature and lower than the second limiting temperature, and belongs to the first limiting temperature range. Control the frequency to be maintained.

Comparing and determining whether the temperature T of the power device is higher than the second limit temperature range, that is, higher than the second limit temperature and lower than the third limit temperature (S120). (S122).

That is, the controller 130 is operated when the temperature T of the power element 112 is in the second limit temperature range higher than the second limit temperature and lower than the third limit temperature, and is applied to the inverter compressor 62. Control to apply the frequency down.

Comparing and determining whether the temperature (T) of the power device is higher than the third limit temperature (S124), when the temperature is higher than the third limit temperature, the inverter compressor is turned off (S126), when the temperature is lowered to the first limit temperature, the inverter compressor Re-run (S128).

That is, when the temperature T of the power element 112 is higher than the third limit temperature, the controller 130 controls the power element 112 so that the inverter compressor 62 is turned off so as not to apply the driving frequency. do.

In this case, when the inverter compressor 62 is turned off and a predetermined time elapses, when the temperature T of the power element 112 is lowered to the first limit temperature, the controller 130 normalizes the operating frequency to the inverter compressor 62. Control to restart by applying.

5 is a control graph of the multi-type air conditioner according to the second embodiment of the present invention, and FIG. 6 is a flowchart illustrating a control method of the multi-type air conditioner according to the second embodiment of the present invention.

Referring to FIG. 5, in the multi-type air conditioner of the present invention, a current I applied to the inverter compressor 62 measured from the current measuring unit 122 is transmitted to the controller 130, and the controller 130 is an inverter compressor. The operating frequency applied to the inverter compressor 62 is controlled in accordance with the current I applied to 62.

That is, when the current I applied to the inverter compressor 62 is lower than the first limiting current, the controller 130 increases the operating frequency applied to the inverter compressor 62 to a set frequency so that the inverter compressor 62 Control to operate.

In addition, the controller 130 may be connected to the inverter compressor 62 when the current I applied to the inverter compressor 62 is in a first limit current range, that is, a range higher than the first limit current and lower than the second limit current. Maintain the current operating frequency applied.

The controller 130 lowers the operating frequency when the current I applied to the inverter compressor 62 is within a second limiting current range, that is, a range higher than the second limiting current and lower than the third limiting current. The control is applied to 62, and the control is made to maintain the operating frequency when the first limit temperature current is lowered.

The controller 130 controls the inverter frequency to not be applied to the inverter compressor 62 when the current I applied to the inverter compressor 62 is higher than the third limit current, and when the inverter I lasts for a predetermined time, the inverter compressor ( Turn off 62).

5 and 6, the multi-type air conditioner of the present invention measures the current (I) applied to the inverter compressor during the operation of the inverter compressor (S200).

That is, the controller 130 controls the driving frequency to be applied through the power element 112 so that the inverter compressor 62 is operated, and changes the current I applied to the inverter compressor 62 by the current measuring unit 122. Control to measure.

In addition, the current measuring unit 122 transmits the measured current I applied to the inverter compressor 62 to the controller 130.

Compared with the current (I) applied to the inverter compressor 62 and the set first limiting current (S212), if the current (I) applied to the inverter compressor 62 is lower than the first limiting current, the operating frequency It raises (S214).

That is, when the current I applied to the inverter compressor 62 is lower than the set first limit current, the controller 130 controls the power element 112 to increase the operating frequency to be applied to the inverter compressor 62. .

If the current I applied to the inverter compressor 62 is in the first limiting current range, that is, higher than the first limiting current and lower than the second limiting current (S216), it belongs to the first limiting current range. The operating frequency is maintained (S218).

That is, the controller 130 is applied to the inverter compressor 62 when the current I applied to the inverter compressor 62 falls within the first limited current range higher than the first limited current and lower than the second limited current. The driving frequency is controlled to be maintained.

When the current I applied to the inverter compressor 62 is in the second limiting current range, that is, higher than the second limiting current and lower than the third limiting current (S220), and if it belongs to the second limiting current range, The driving frequency is lowered (S222).

That is, the controller 130 applies the inverter I to the inverter compressor 62 when the current I applied to the inverter compressor 62 is higher than the second limit current and lower than the third limit current, that is, within the second limit current range. The driving frequency is controlled to be lowered and applied.

Comparing and determining whether the current I applied to the inverter compressor 62 is higher than the third limit current (S224). If the current I is higher than the third limit current, the inverter compressor is turned off (S226) and lowered to the first limit current. When the inverter compressor is restarted (S228).

That is, the controller 130 controls the power element 112 so that the inverter compressor 62 is turned off when the current I applied to the inverter compressor 62 is higher than the third limit current so as not to apply the operating frequency. To control.

In this case, when the inverter I is turned off and the current I applied to the inverter compressor 62 is lowered to the first limiting current after a predetermined time has elapsed, the controller 130 normally returns to the inverter compressor 62. Control to restart the operation by applying the operating frequency.

The multi-type air conditioners according to the first and second embodiments of the present invention have been described to control the operating frequency according to the temperature of the power element and the current applied to the inverter compressor, but the multi-type air conditioners are turned off by controlling the operating frequency. By enabling the continuous operation so as not to, there is an advantage to reduce the energy waste generated when the product on / off.

Although a preferred embodiment of the present invention has been described in detail above, those skilled in the art to which the present invention pertains can make various changes without departing from the spirit and scope of the invention as defined in the appended claims. It will be appreciated that modifications or variations may be made. Accordingly, modifications of the embodiments of the present invention will not depart from the scope of the present invention.

The multi-type air conditioner and the control method thereof according to the present invention enable continuous operation without turning off the air conditioner product according to external influences, thereby reducing energy efficiency and convenience in using the multi-type air conditioner product on / off. There is an effect that can be increased.

Claims (16)

Measuring a temperature of a power device for supplying an operating frequency to the compressor; Setting a plurality of temperature ranges and determining where the temperature of the power element belongs among the plurality of temperature ranges; And And controlling the temperature of the power device by raising, maintaining, or decreasing the operating frequency according to the determination result. The method of claim 1, wherein the power device, Control method of a multi air conditioner, which is either IPM or PFCM. The method of claim 1, And raising the operating frequency if the determination result is lower than the first limit temperature range. The method of claim 1, And lowering the operating frequency when the determination result is a second limited temperature range higher than the first limited temperature range. 5. The method of claim 4, And stopping the compressor if the temperature is higher than the second limit temperature range. The method of claim 1, The first limit temperature range is 73 ° C to 75 ° C or higher and 77 ° C to 79 ° C or lower, If the temperature of the power device is within the first limiting temperature range, stopping the increase of the operating frequency to lower the temperature of the power device. 6. The method of claim 5, The second limit temperature range is, The control method of the multi type air conditioner of 79 to 80 degreeC or more and 84 to 86 degreeC. Measuring a current supplied to a power device supplying an operating frequency to the compressor; Setting a plurality of limiting current ranges and determining where the current belongs to the plurality of limiting current ranges; And And operating the compressor by raising, maintaining, or decreasing the operating frequency according to the determination result. The method of claim 8, wherein the power device, Control method of a multi air conditioner, which is either IPM or PFCM. 9. The method of claim 8, The step of operating the compressor, If the determination result is a first limited current range, the rise of the operating frequency is stopped to lower the temperature of the power device, And raising the operating frequency when the determination result is lower than the first limit current range. 9. The method of claim 8, And reducing the operating frequency if the determination result belongs to a second limited current range higher than the first limited current range. The method of claim 11, And turning off the compressor if it is higher than the second limit current range and the operating frequency is less than a predetermined frequency. 9. The method of claim 8, The first limit current range is 10 amps (A) or more and 11 amps (A) or less, And if the determination result is within the first limiting current range, stopping the increase of the operating frequency to lower the temperature of the power device and controlling the multi-type air conditioner. The method of claim 11, wherein the second limit current range, A control method of a multi-type air conditioner of 11 amps (A) or more and 13 amps (A) or less. The method of claim 12, wherein the predetermined frequency, Control method of a multi-type air conditioner of 14Hz to 16Hz. A power element for applying an operating frequency to the inverter compressor; A measuring unit measuring an operating current based on the operating frequency and a temperature of the power device; And A controller configured to set a plurality of current ranges or temperature ranges, and control the operation frequency to rise, hold, or fall according to the current range or the temperature range to which any one of the operating current and the temperature of the power element belongs. Multi type air conditioner including.

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