JP2012233604A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner capable of detecting an alternating current voltage which is used in the case of computing the electric energy of the air conditioner at low cost.SOLUTION: The air conditioner is operated in an operation period A from three to six o'clock in an operation period B from eight to fifteen o'clock, and in an operation period C from eighteen to twenty-three o'clock and the operation is stopped (in a waiting state) in periods except these periods. An outdoor unit control section obtains the input alternating current voltage per time zone, and stores it as an operation stop voltage in a current/voltage table. Since the input alternating current voltage cannot be obtained during each operation period, an average value of the input alternating current voltage immediately before starting the operation and the input alternating current voltage immediately after stopping the operation is stored as an operation average voltage of the corresponding time zone. The consumed electric energy in each operation of the air conditioner is computed based on the operation average voltage and the load current (input current) sequentially stored during the operation.

Description

  The present invention relates to an air conditioner, and more particularly to a method for measuring and calculating an input AC voltage, which is one of parameters for calculating a power consumption rate and power consumption.

  2. Description of the Related Art Conventionally, an air conditioner that displays an electricity bill for use has been disclosed. This electricity usage rate is calculated by multiplying the unit power rate specified based on the contract with each power company by the amount of power consumed per hour: kWh (kilowatt hour). In the case of a single phase, the power consumption is obtained by multiplying the input AC voltage value (effective value) by the input AC current value and the power factor, and adding up the result to obtain a converted value for one hour.

Specifically, after the operation of the air conditioner is started, the input alternating current value in the unit time during operation is converted into the input alternating current amount per hour and integrated. For example, when the unit time is 10 minutes, when 6 amperes of input current is consumed for 10 minutes, 10 minutes / 60 minutes (1 hour) × 6 amperes becomes 1 ampere / hour. This is integrated 6 times every 10 minutes (1 hour) to determine the amount of input AC current. The power consumption is calculated by multiplying the input AC power amount integrated when the operation is stopped by the input AC power supply voltage value: 100 V (effective value) and the power factor, and the power consumption fee is calculated from this and the unit power charge. Then, the calculated power consumption charge is displayed on the charge display unit (for example, see Patent Document 1).
In this example, the calculation is performed on the assumption that there is no fluctuation between the input AC power supply voltage value and the power factor. However, if there is a fluctuation, it is necessary to calculate and integrate the power consumption every unit time.

  As described above, the input AC voltage value is required for calculating the electric energy. However, since a fixed value (100 V) is used for this in Patent Document 1, the actual electric energy is used when the power supply voltage fluctuates. Error will occur. In particular, when displaying the amount of money as an electricity bill to the user, the most accurate value is required.

  In order to accurately measure the amount of electric power, a watt hour meter or voltmeter may be prepared separately from the air conditioner, and these measurement results may be captured by the air conditioner. Will lead to price increases. For this reason, a method is conceivable in which the input AC voltage is estimated using DC voltage detection means already provided in the air conditioner, and the amount of power is calculated using the estimated AC voltage and the actually measured AC current.

  The DC voltage detection means is provided in almost all air conditioners, and is used for a voltage monitoring circuit using an active filter, a power factor correction circuit, voltage monitoring of a power supply for an inverter, and the like. As is well known, there is a correlation between the AC voltage value and the DC voltage value obtained by rectifying the AC voltage value. If the DC voltage is not affected by the load, the AC voltage can be estimated from the DC voltage. When the AC power supply is rectified to a DC power supply, the DC voltage is approximately 1.41 times the AC voltage. However, since the voltage actually decreases due to the influence of the smoothing capacitor and the load, the input AC voltage value The relationship with the DC voltage value is experimentally obtained in advance using an actual power supply circuit.

  However, if the load fluctuates during measurement of the DC voltage, the DC voltage being measured also fluctuates. For this reason, it becomes impossible to distinguish between voltage fluctuations due to loads and voltage fluctuations due to AC voltages. That is, when driving a load, for example, when an inverter circuit or the like is driven, there is a problem that an AC voltage cannot be estimated.

JP 2000-147029 A (page 4, FIG. 1)

  An object of the present invention is to solve the above-described problems and to provide an air conditioner that can detect an AC voltage used for calculating the electric energy of the air conditioner at low cost.

In order to solve the above-described problems, the present invention is an air conditioner that calculates power consumption during operation,
A power supply unit that rectifies and converts the AC power supply to a DC power supply, an output voltage detection unit that detects an output voltage of the power supply unit, a load current detection unit that detects a load current of the air conditioner, and A control unit that inputs the output voltage and the load current and controls the air conditioner,
The control unit detects the output voltage during an operation stop period before and after the operation period of the air conditioner, obtains an average value of the detected output voltage, and determines an effective alternating current of the AC power source during the operation from the average value. Estimate the average operating voltage consisting of voltage values,
The power consumption amount in the operation period is calculated using the average operation voltage and the load current sequentially detected during the operation period.

  Further, the control unit calculates the power consumption amount in the operation period using an average value of the output voltages detected immediately before and immediately after the operation period.

  By using the above means, according to the air conditioner according to the present invention, the invention according to claim 1 obtains the average value of the output voltage detected in the operation stop period before and after the operation period of the air conditioner, In order to estimate the voltage of the AC power supply during operation from the average value and calculate the power consumption amount during the operation period using the average operation voltage and the load current sequentially detected during the operation period, the air conditioner is already provided. Since the input AC voltage (effective value) during operation can be estimated only from the data obtained from the output voltage detection unit of the DC power supply, the cost can be reduced.

  The invention according to claim 2 estimates the input AC voltage during operation using the operation average voltage obtained by averaging the DC output voltage obtained immediately before / after the operation period and estimating the input AC voltage. Accuracy can be improved.

It is a block diagram which shows the Example of the air conditioner by this invention. It is a block diagram which shows the outdoor unit power supply part of the air conditioner by this invention. It is explanatory drawing explaining the method of estimating the alternating voltage by this invention. It is explanatory drawing explaining the electric current and voltage table memorize | stored in the outdoor unit control part. It is a flowchart explaining operation | movement of an outdoor unit control part.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail as examples based on the attached drawings.
In the present invention, the DC output voltage of the power supply unit built in the outdoor unit is measured at the timing immediately before the start of operation and immediately after the operation is stopped, and the input AC voltage (effective value) at this time is estimated based on the measurement result. . Then, using the estimated average value of the two input AC voltages and the load current (input current) sequentially detected and stored during operation, the power consumption consumed by the air conditioner after operation is stopped. It is characteristic to calculate.

  FIG. 1 is a block diagram showing an air conditioner. This air conditioner includes an indoor unit 40 and an outdoor unit 30, which are connected by a power line and a communication line. In addition, illustration of the structure which is not directly related to this application, such as a heat exchanger and a refrigerant circuit, is abbreviate | omitted.

  The indoor unit 40 includes a remote control receiving unit 42 that receives an infrared signal of a remote controller (not shown), an indoor unit power supply unit 43, a power supply relay 44 that turns on / off power supply to the outdoor unit 30, and an indoor unit fan motor 47. An indoor unit communication unit 45 that transmits / receives data to / from the outdoor unit 30 via a communication line, a display unit 46 that displays an electricity bill, an indoor unit fan motor 47, a power supply relay 44, a remote control receiver 42, and an indoor unit. An indoor unit control unit 48 that controls the unit communication unit 45 and the display unit 46 is provided.

  On the other hand, the outdoor unit 30 includes an outdoor unit power source 21, a compressor motor 17, a compressor drive unit 16 that drives the compressor motor 17, and an outdoor unit that transmits and receives data to and from the indoor unit via a communication line. An outdoor unit that controls the communication unit 15, the four-way valve 19 for switching the refrigerant circulation direction, the outdoor unit fan motor 20, the compressor driving unit 16, the outdoor unit communication unit 15, the four-way valve 19, and the outdoor unit fan motor 20. And a control unit 18. Note that the outdoor unit control unit 18 has a built-in clocking means such as a counter (not shown) so that the current time and the passage of time can be detected.

  The compressor drive unit 16 receives a DC voltage supplied from the outdoor unit power supply unit 21 and drives the compressor motor 17 under the control of the outdoor unit control unit 18, and the input to the inverter unit 16a. A shunt resistor 16b for detecting a current (current consumption). The voltage corresponding to the converted current consumption is output to the outdoor unit control unit 18 and converted into a current value by an A / D converter (not shown) inside the outdoor unit control unit 18. This current value is used to perform current limiting and overcurrent detection.

  The indoor unit power supply unit 43 supplies power to each unit of the indoor unit 40 when power is supplied through the power plug. When a control signal, for example, a power-on signal is transmitted from the remote control to the indoor unit control unit 48 via the remote control receiving unit 42, the indoor unit control unit 48 turns on the power supply relay 44, and then the indoor unit communication unit An operation instruction is given to the outdoor unit control unit 18 via 45. The outdoor unit control unit 18 controls the compressor driving unit 16 according to the given instruction and performs the instructed operation.

  At this time, the input AC current (load current) and the DC voltage obtained by rectifying the AC voltage are detected inside the outdoor unit power supply unit 21 and the detection results are used as signals corresponding to the load current value and the DC voltage value, respectively. This is output to the outdoor unit control unit 18. The outdoor unit control unit 18 converts these signals into a load current value and a DC voltage value by an A / D converter (not shown) inside the outdoor unit control unit 18 and uses these values to consume power in the outdoor unit 30. The amount of power is obtained and transmitted to the indoor unit 40, and the amount of power consumed and the amount of power consumed obtained by the indoor unit 40 are summed to calculate the electricity bill.

  FIG. 2 is a block diagram showing the outdoor unit power supply unit 21. The rectifier circuit 2, the booster circuit 3, the smoothing capacitor 12 that smoothes the output voltage boosted by the booster circuit 3, and the load current of the outdoor unit power supply unit 21. A current sensor (for example, current transformer) 6 for detecting (input current), a load current detector 8 for detecting a load current based on a detection signal from the current sensor 6, and an output voltage (bus voltage) of the booster circuit 3 An output voltage detection unit 10 for detection and a switching control unit 7 for driving the booster circuit 3 are provided. The switching control unit 7 can stop the switching operation by an instruction of a switching stop signal output from the outdoor unit control unit 18.

  The booster circuit 3 includes a reactor 3a connected in series to one terminal side of the rectifier circuit 2, a reverse blocking diode 3b connected in series to the reactor 3a, and a rectifier circuit between the reactor 3a and the reverse blocking diode 3b. 2 and a switching element (for example, IGBT; insulated gate transistor) 3c connected to the negative terminal side.

  A control unit power supply circuit 13 is connected in parallel with the smoothing capacitor 12. The control unit power supply circuit 13 supplies a low-voltage power supply mainly used in the outdoor unit control unit 18 and the like, and hardly varies as a load. Therefore, when the AC power supply is lowered, the control unit power supply circuit 13 consumes the electric charge charged in the smoothing capacitor 12, so that the voltage across the smoothing capacitor is lowered corresponding to the voltage of the AC power supply. Conversely, when the AC power source rises, the voltage across the smoothing capacitor 12 rises. This voltage is detected by the output voltage detector 10 and output to the outdoor unit controller 18.

  In the outdoor unit power supply unit 21, the input side of the rectifier circuit 2 is connected to a power supply relay 44. When the relay 44 is closed, the input AC power is rectified and supplied to the compressor drive unit 16. Then, it is supplied to the outdoor unit control unit 18 and the like via the control unit power supply circuit 13. The load current detected by the load current detection unit 8 is a signal corresponding to the load current value, and the DC voltage detected by the output voltage detection unit 10 is a signal corresponding to the DC voltage value. 18 is output.

  However, when the switching control unit 7 outputs a drive signal to switch the switching element 3c, the voltage across the smoothing capacitor 12 increases. Therefore, when the input AC voltage is estimated from the voltage detected by the output voltage detection unit 10, the outdoor voltage The machine control unit 18 outputs a switching stop signal to the switching control unit 7 to stop the switching of the switching element 3c. When the voltage across the smoothing capacitor 12 is stabilized, for example, after 2 to 3 seconds have elapsed, the input AC voltage is estimated using the detection voltage in the output voltage detection unit 10. In addition, when there are many ripple components in the both-ends voltage of the smoothing capacitor 12, you may average and use the both-ends voltage of the smoothing capacitor 12 detected in multiple times with the predetermined period.

FIG. 3 is an explanatory diagram for explaining an example of the voltage change of the AC power source in each time zone from 0:00 to 23:00 and a method for estimating the AC voltage according to the present invention.
The outdoor unit control unit 18 measures the DC voltage via the output voltage detection unit 10 at a plurality of timings, and estimates the input AC voltage at this time based on the measurement result. Then, the operation stopped using the average value of the two input AC voltages estimated before the start of operation and after the stop of operation and the load current (input current) sequentially detected and stored by the load current detecting unit 8 during the operation. Later, the amount of power consumed by the air conditioner is calculated.

  FIG. 4 shows the operation stop voltage at the time of operation stop (the value of the input AC voltage converted from the measured DC voltage) and the operation average voltage during operation of the air conditioner (operation start) in each time zone from 0 to 23:00. It is explanatory drawing explaining the electric current and voltage table which each memorize | stores the load current value measured by the load current detection part 8 and the average value of the operation stop voltage immediately before and immediately after an operation stop). This current / voltage table is stored in a storage unit (not shown) in the outdoor unit control unit 18. For convenience of explanation, this current / voltage table is divided into 24 hours, but it is further divided into sections, and data is calculated every 10 minutes or every 5 minutes to calculate power consumption. Accuracy can be improved.

3 and 4, the air conditioner is operated in an operation period A from 3 to 6 o'clock, an operation period B from 8 o'clock to 15 o'clock, and an operation period C from 18 o'clock to 23 o'clock, During other periods, the operation is stopped (standby state). In this embodiment, the outdoor unit control unit 18 estimates the input AC voltage for each time period and stores it as the operation stop voltage in the current / voltage table. However, since the input AC voltage cannot be estimated during each operation period, the average value of the input AC voltage estimated immediately before the operation start and immediately after the operation stop is stored as the operation average voltage in the corresponding time zone.

  For example, in the operation period A, since the operation is started at 3 o'clock, the operation stop voltage immediately before the operation starts: 101.0 volts in the 3 o'clock column, and since the operation stop is 6 o'clock, the operation immediately after the operation stop Stop voltage: 102.0 volts is stored in the 6 o'clock column. The same applies to other operation periods.

  Then, the outdoor unit control unit 18 operates at an input AC voltage estimated from the output voltage value detected at the start / end time of the operation at the end of each operation period, for example, the operation period A. Obtain from the value of stop voltage. In the case of the operation period A, since the operation stop voltage immediately before the operation start is 101.0 volts and the operation stop voltage immediately after the operation stop is 102.0 volts, this average value: 101.5 volts is used for each time zone during operation. Is stored in the column of average operating voltage from 3 o'clock to 5 o'clock in the current / voltage table. Other operation periods are similarly obtained and stored.

  When it is necessary to display the amount of power consumption during the operation when the operation is stopped, the calculated operation average voltage value: 101.5 volts, the load current value for each time zone, and the power factor of the outdoor unit power supply unit 21 (experiment in advance) The power consumption amount of the outdoor unit 30 is obtained by multiplying this by the operation period, and this data is transmitted to the indoor unit control unit 48. Then, the indoor unit control unit 48 adds the received power consumption amount of the outdoor unit 30 and the power consumption amount expected by the indoor unit 40 and causes the display unit 46 to display the power consumption amount of the air conditioner. Note that the power consumption predicted by the indoor unit 40 is obtained by adding a correction according to the operating state of the indoor unit fan motor 47 to a fixed value obtained experimentally in advance.

Specifically, the power consumption of the outdoor unit 30 is set such that, in the current / voltage table, the load current value at 3 o'clock: 6 amps, 4 o'clock: 5 amps, 5 o'clock: 4 amps, and the operation average voltage: 101.5 volts, respectively. The multiplied product is integrated, and this can be multiplied by, for example, a power factor of 0.8 to obtain 1.2 kWh as the power consumption during the operation period A.
In addition, when an electricity bill is required, it may be calculated by multiplying the power consumption of the air conditioner by a unit power bill.

  The above explanation is a method of estimating the short-term input AC voltage for each operation period. However, when the operation period is long, the input AC voltage during operation using only the input AC voltage measured at the start / stop of operation. In some cases, the error may become large. For example, when driving from 6 o'clock to 18 o'clock, the operation stop voltage at the start / stop of the operation is both 102 volts, so that the average voltage during the operation period is 102 volts as described above. However, since this is only measuring two points where the voltage fluctuation is accidentally increased, the error is large in such a case.

  For this reason, in this embodiment, the input AC voltage is obtained for each time zone even when the operation is stopped, and stored as the operation stop voltage in the current / voltage table. Further, the input AC voltage during the operation period is obtained as the operation average voltage by the method described above, and is stored in the current / voltage table for each time period. Then, an average value of the input AC voltage during operation stop and the input AC voltage during operation is calculated for a predetermined period for accumulating power consumption, for example, midnight, which is the end time of the day, and this calculated one day The amount of power consumption during operation in one day is calculated using the average voltage value at.

  Specifically, in the current / voltage table, the value in the column of each stop voltage at 0 o'clock to 2 o'clock, 6 o'clock to 7 o'clock, 15 o'clock to 17 o'clock, 23 o'clock, 3 o'clock to 5 o'clock, 8 o'clock The values in the column of the operation average voltage at Hours to 14:00 and 18:00 to 22:00 are totaled and divided by the total number of data 24 to obtain the average voltage value for one day. The values in the column of each shutdown voltage are 98.0, 99.0, 100.0, 102.0, 100.5, 99.2, 100.5, 101.4, 99.2, and the total is 899. .8. On the other hand, the total operation average voltage during the operation period is 1504.0, and the total time zone of 24 points is 2403.8. Therefore, the average voltage in a predetermined period (24 hours), that is, the period average voltage is 100.2 volts.

  Thus, the average value of the operation stop voltage and the operation average voltage estimated for a certain period of time, for example, every hour within a predetermined period, for example, is set as the period average voltage in this predetermined period, and this period average voltage is used. Thus, the calculation error due to the input AC voltage value that is extremely far from the actual voltage can be eliminated.

Depending on the driving, the vehicle may be driven across dates. For example, when the operation is started from 23:00 and the operation is stopped at 2 o'clock the next day, the power consumption in this operation may be distributed between the current day and the next day. In this case, it is necessary to prepare at least two days for the current / voltage table.
In this embodiment, the current / voltage table is used for only one day, and in the operation over the date, the input AC voltage immediately before the start of operation or the input AC voltage immediately after the operation stop is used as the input AC voltage during operation. Specifically, when the operation is performed from 22:00 today to 2 o'clock on the next day, the operation stop voltage obtained when the operation is started is stored in the operation average voltage column at 22:00 to 23:00 in the current / voltage table. And the operation stop voltage calculated | required when this driving | operation was stopped is memorize | stored in the column of the driving | operation average voltage of 0-2 o'clock.

  In this way, the operation is divided into the current day and the next day, and the power consumption is calculated every 24 hours. Therefore, the current / voltage table need only be for one day, and the memory capacity can be saved. it can.

  In order to obtain the power consumption of the entire air conditioner, it is necessary to add up the power consumption of the indoor unit 40 and the power consumption of the outdoor unit 30. Since it is smaller than the air conditioner 30, the error value is small when viewed from the whole air conditioner even if the AC voltage changes. Therefore, in this embodiment, the value of the input AC voltage is estimated and used by the outdoor unit 30, and the indoor unit 40 uses a fixed AC voltage value (100V). If a more accurate value is required, not only the power consumption of the outdoor unit 30 but also the data of the operation stop voltage item in the current / voltage table is transmitted from the outdoor unit 30 to the indoor unit 40. The power consumption amount of the indoor unit 40 may be obtained using the value of the operation stop voltage.

  As described above, the average value of the output voltage detected during the operation stop period before and after the operation period of the air conditioner is obtained, the voltage of the AC power supply during operation is estimated from the average value, and the operation average voltage and the operation period are estimated. In order to calculate the amount of power consumption during the operation period using the load current detected sequentially, the operation is performed only with the data obtained from the output voltage detection unit 10 of the outdoor unit power supply unit 21 already provided in the air conditioner. Since the input AC voltage (effective value) can be estimated and obtained, the cost can be reduced without requiring a new circuit.

  Moreover, since the input AC voltage during operation is estimated using the average operation voltage obtained by averaging the DC output voltage obtained immediately before / after the operation period and estimating the input AC voltage, it is close to the input AC voltage during operation. Since the voltage value can be used, the accuracy can be improved.

  Next, the process of the power consumption amount in the outdoor unit 30 will be described using the flowchart of the process of the outdoor unit control unit 18 shown in FIG. ST shown in FIG. 5 represents a step, the number following this represents a step number, Y represents Yes, and N represents No. Note that the processing of the indoor unit 40 is a process of simply adding and displaying the power consumption amount of the outdoor unit 30 and the power consumption amount of the indoor unit 40 transmitted from the outdoor unit 30, and therefore the flowchart of the indoor unit 40. The description by is omitted.

  The outdoor unit control unit 18 first checks whether there is an instruction from the indoor unit 40 via the outdoor unit communication unit 15 (ST1). When there is an instruction from the indoor unit 40 (ST1-Y), it is confirmed whether the instruction from the indoor unit 40 is an operation start instruction (ST2). When the instruction from the indoor unit 40 is an operation start instruction (ST2-Y), the input AC voltage is estimated from the DC voltage measured by the output voltage detector 10, and this value corresponds to the current time of the current / voltage table. It memorize | stores in the column of an operation stop voltage (ST3). Then, the instructed operation is started (ST4), and the process jumps to ST1. When the operation is started, the operation start time is stored at the same time.

  On the other hand, when the instruction from the indoor unit 40 is not an operation start instruction (ST2-N), it is next confirmed whether the instruction from the indoor unit 40 is an operation stop instruction (ST5). If the instruction from the indoor unit 40 is not an operation stop instruction (ST5-N), a process according to the instruction, for example, a process such as switching of the operation mode is performed (ST15), and the process jumps to ST1.

When the instruction from the indoor unit 40 is the operation stop instruction (ST5-Y), the current operation is stopped (ST6), the input AC voltage is estimated from the DC voltage measured by the output voltage detector 10, and this value is determined as the current. Store in the column of the operation stop voltage corresponding to the current time of the voltage table (ST7).

  Next, it is confirmed whether the operation is across the date (ST8). This is determined by comparing the operation start time stored at the start of operation with the current time. If the operation is not over the date (ST8-N), use the values in the current / voltage table's operation stop voltage and operation average voltage columns to determine the operation average voltage for the current operation, and measure this during operation. The power consumption consumed in the current operation is calculated using the values in the load current value column stored in the current / voltage table. Then, this power consumption is transmitted to the indoor unit 40 (ST9), and the process jumps to ST1. In the case of operation across dates (ST8-Y), the input AC voltage at the time of operation stop is estimated and stored in the operation average voltage column of the corresponding operation time zone of the current / voltage table (ST10). Then jump to ST9.

  On the other hand, when there is no instruction from the indoor unit 40 (ST1-N), it is confirmed whether the date has been updated (ST11). This can be determined by whether the date of the time measuring means inside the outdoor unit control unit 18 has changed. If the date has not been updated (ST11-N), the current state (running or stopped) is continued (ST16), and the process jumps to ST1. In ST16, during operation, the load current detected via the load current detection unit 8 is stored in the load current value column of the current / voltage table for each time period. On the other hand, when the vehicle is stopped, the input AC voltage is estimated from the DC voltage measured by the output voltage detection unit 10 for each time period, and this value is the column of the operation stop voltage corresponding to the current time in the current / voltage table. To remember.

  When the date is updated (ST11-Y), it is confirmed whether the vehicle is currently operating (ST12). When currently operating (ST12-Y), the input AC voltage at the time of operation stop is unknown, so the value in the operation stop voltage column of the current / voltage table stored at the start of operation is used as the input AC voltage during operation. It memorize | stores in the driving | operation average voltage column of each time slot | zone which had been (ST13).

  Then, the average voltage (period average voltage) of the input AC voltage in the daily operation is obtained by using the values in the operation stop voltage and operation average voltage columns of the current / voltage table, and measured during the operation to obtain the current. -The amount of power consumed in one day operation is calculated using the value in the load current value column stored in the voltage table. Then, this power consumption is transmitted to the indoor unit 40 (ST14), and the process jumps to ST1. If the vehicle is not currently in operation, that is, if it is stopped (ST12-N), the process jumps to ST14.

  In this embodiment, the input alternating current is used as the load current. However, the present invention is not limited to this, and the value detected by the shunt resistor that detects the current to the inverter unit 16a provided in the compressor driving unit 16 is used. It may be used.

DESCRIPTION OF SYMBOLS 2 Rectifier circuit 3 Booster circuit 3a Reactor 3b Reverse blocking diode 3c Switching element 6 Current sensor 7 Switching control part 8 Load current detection part 10 Output voltage detection part 12 Smoothing capacitor 13 Control part Power supply circuit 15 Outdoor unit communication part 16 Compressor drive part 16a Inverter unit 16b Shunt resistor 17 Compressor motor 18 Outdoor unit control unit 19 Four-way valve 20 Outdoor unit fan motor 21 Outdoor unit power unit 30 Outdoor unit 40 Indoor unit 42 Remote control receiver 43 Indoor unit power unit 44 Power supply relay 45 Indoor unit Communication unit 46 Display unit 47 Indoor unit fan motor 48 Indoor unit control unit

Claims (2)

An air conditioner that calculates power consumption during operation,
A power supply unit that rectifies and converts the AC power supply to a DC power supply, an output voltage detection unit that detects an output voltage of the power supply unit, a load current detection unit that detects a load current of the air conditioner, and A control unit that inputs the output voltage and the load current and controls the air conditioner,
The control unit detects the output voltage during an operation stop period before and after the operation period of the air conditioner, obtains an average value of the detected output voltage, and determines an effective alternating current of the AC power source during the operation from the average value. Estimate the average operating voltage consisting of voltage values,
The air conditioner characterized in that the power consumption amount in the operation period is calculated using the operation average voltage and the load current sequentially detected during the operation period.   2. The air conditioner according to claim 1, wherein the control unit calculates the power consumption amount during the operation period using an average value of the output voltages detected immediately before and immediately after the operation period.

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