JP2008070075A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means capable of carrying out an operation without stop, when the operation is controllable even in an electric power source unbalance, and capable of stopping the operation when unbalance abnormality is detected or when a detecting circuit is abnormal. <P>SOLUTION: A current from compressor start for this air conditioner, and an electric power source unbalance of a three-phase electric power source by a capacity of the air conditioner, are accurately detected by a current sensor 2 of the three-phase electric power source, a rotation speed setting means 3, a capacity setting means 4 and an operation control means 5, the operation is allowed even in the slight electric power source unbalance, and the electric power source unbalance abnormality is detected in case of a current value set by an unbalance current setting means or less, to stop the air conditioner. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to detection of an unbalanced voltage abnormality when a three-phase power supply is unbalanced in an air conditioner having a current sensor such as a current transformer.

  Conventionally, in this type of air conditioner, for example, there is an air conditioner described in FIG.

  In FIG. 7, a rectifying unit 102 that rectifies the three-phase power source 101 into a DC voltage, a smoothing unit 103 that smoothes the DC voltage rectified by the rectifying unit, and an inverter 104 that uses the smoothed DC voltage as a power source, A three-phase motor 105 driven by the inverter, a voltage detection means 106 for detecting the smoothed DC voltage, and a control unit 107 for calculating a ripple amount of the voltage detected by the voltage detection means. .

Then, after the start of the three-phase motor 105, if the ripple amount detected by the control unit 107 is not less than a predetermined value and after a predetermined time has elapsed, it is determined that the three-phase power supply is unbalanced and the control unit By sending a stop signal to the inverter 104 from 107 and stopping the three-phase motor 105, if an unbalance occurs, the unbalance is detected quickly and a protective operation is applied to the inverter 104. It is possible to avoid problems such as damage to the control device due to operation at the time (for example, see Patent Document 1).
JP 2006-180649 A

  However, in the above conventional configuration, the amount of ripple of the voltage after smoothing the input power supply voltage is detected. Therefore, even if there is harmonic noise on the power supply or ripple due to power supply voltage distortion, it is erroneously detected as unbalanced. Will be. In addition, this method has a problem of stopping even if it can be operated if it is detected as a three-phase imbalance.

  The present invention solves the above-mentioned conventional problem, and detects the current value of the three-phase power supply with a current sensor, and the power supply unbalance abnormality is detected by the current from the start of the compressor of the air conditioner and the capacity of the air conditioner. By detecting this, it is possible to accurately detect power supply unbalance, enable operation even with some power supply unbalance, and enable unbalance detection with a compressor that is not an inverter.

  In order to solve the above problems, the present invention is provided with an air conditioner including a current sensor for detecting a current of a three-phase power source, a rotation speed setting means, and a capacity setting means for setting the capacity of an air conditioner. .

  As a result, even if the three-phase power supply of the air conditioner is in an unbalanced state, it can be operated for each operating capacity of the air conditioner and can be detected correctly even when the power supply unbalance is abnormal. Detection can be performed even in the absence, and an abnormality of the current sensor itself is also detected.

  The air conditioner of the present invention detects the current value of the three-phase power supply, and performs operation control by the ability of the air conditioner even if there is some power imbalance regardless of the compressor control method. It is also possible to distinguish between abnormalities in the phase power supply unbalance and abnormalities in the current sensor.

1st invention detects the electric current of a power supply, converts it into a voltage, the rotation speed setting means which sets the compressor rotation speed at the time of the imbalance detection after starting, and the capability to set the capability of an air-conditioning conditioner When the compressor of the air conditioner reaches the rotational speed designated by the rotational speed setting means, the operational control means is determined by the capacity setting means. The unbalanced abnormal voltage is calculated from the obtained capability number, and if it is equal to or less than the calculated abnormal current value, it is determined that the operation is stopped due to the unbalanced abnormality, and the operation of the air conditioner is stopped.

  According to a second aspect of the present invention, in the air conditioner of the first aspect of the present invention, a start-up current storage means for storing a current value at the start of the compressor is provided, and the operation control means detects the rotation speed of the compressor after the start-up. When the current value from the current sensor does not change from the current value at the start-up at a predetermined rotational speed, it is determined that the current sensor is abnormal.

  According to a third aspect of the air conditioner of the first aspect of the present invention, the air conditioner has a start-up current setting means for setting an abnormality in a current value at start-up, and the current set by the start-up current setting means at the start-up of the air conditioner If it is less than the value, it is determined that the power supply is unbalanced and the air conditioning operation is stopped.

  According to a fourth aspect of the present invention, the air conditioner according to any one of the first to third aspects is provided with a timer for measuring a predetermined time after activation, and the current value at the time of activation and after the timer time has elapsed after activation. A slope with the current value is calculated, and if the slope is equal to or less than a predetermined slope set by the capability setting means, it is determined that the power supply is unbalanced and the operation is stopped.

  In particular, the fifth aspect of the invention relates to unbalanced abnormality display means for notifying the air conditioner according to any of the first to fourth aspects of the invention of abnormality detection when a power supply unbalanced abnormality is detected, and abnormality of the current sensor. Current sensor abnormality display means for displaying at the time of detection is provided. When an unbalance abnormality of the power supply voltage is detected, the unbalance abnormality display means is turned on, and when a current sensor abnormality is detected, the current sensor abnormality display means is turned on.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram of an air conditioner 1 according to Embodiment 1 of the present invention. In the figure, the same components as those in FIG. FIG. 6 is a timing chart in the present embodiment, and the operation will be described below with reference to FIG.

  In FIG. 1, an air conditioner 1 includes a current sensor current sensor 2 that detects a current from a power source and converts it into a voltage, a rotation speed setting means 3 that sets a compressor rotation speed when an unbalance is detected after startup, an air conditioner Capacity setting means 4 for setting the capacity, operation control means 5 for controlling the operation of the outdoor unit 1, an inverter 104, and a three-phase motor 105.

  The operation control means 6 detects the current value (c1) when the compressor of the air conditioner 1 configured as described above has reached the rotation speed (b1) designated by the rotation speed setting means 5. An abnormal current value is calculated from the number of capacities determined by the setting means 5, and if it is equal to or less than the calculated abnormal current value, it is determined that the operation is stopped due to an unbalanced abnormality, and the operation of the air conditioner is stopped. Can do.

(Embodiment 2)
FIG. 2 is a block diagram of the air conditioner according to Embodiment 2 of the present invention, and is provided with a startup current storage means 6 for storing a startup current value. In the figure, the same components as those in FIG.

  In the air conditioner 1 configured as described above, the operation control means 6 stores the current value (a1) at the start of the compressor in the start-up current storage means 6, and detects the rotation speed of the compressor after the start-up. When the current value (c1) from the current sensor 2 at the predetermined rotational speed is not changed from the current value at the time of starting the compressor stored in the current storage unit 6 at the time of starting, it is determined that the current sensor is abnormal. .

(Embodiment 3)
FIG. 3 is a block diagram of an air conditioner according to Embodiment 3 of the present invention, and is provided with startup current setting means 7 for setting an abnormal current value at startup. In the figure, the same components as those in FIG.

  The air conditioner 1 configured as described above determines that the power supply is unbalanced when the current value (a1) when the compressor is started is equal to or less than the current value set by the start-time current setting means 7. Stop the operation of the harmony machine.

(Embodiment 4)
FIG. 4 is a block diagram of an air conditioner according to Embodiment 4 of the present invention, and a timer 8 is provided for measuring a certain time after activation. In the figure, the same reference numerals are used for the portions described in the third embodiment, and description thereof is omitted.

  The operation control means 5 of the air conditioner 1 configured as described above has an inclination (d) between the current value (a2) at the time of activation and the current value (b2) after the timer time has elapsed since the activation by the timer 8. And a predetermined gradient (e) is calculated from the capability value set by the capability setting means 4, and the value of the gradient (d) of the current value after the timer time has elapsed is equal to or less than the calculated gradient (e). In this case, it is determined that the three-phase power supply is unbalanced and the operation is stopped.

(Embodiment 5)
FIG. 5 is a block diagram of an air conditioner according to Embodiment 5 of the present invention. In the figure, the same reference numerals are used for portions described in the fourth embodiment, and description thereof is omitted.

  The air conditioner according to the first embodiment is provided with unbalance abnormality display means 9 for notifying abnormality detection at the time of power supply unbalance abnormality and current sensor abnormality display means 10 for displaying current sensor abnormality upon detection.

  The air conditioner 1 configured as described above turns on the unbalance abnormality display means 9 when detecting an unbalance abnormality in the power supply voltage, and displays a current sensor abnormality display when a current sensor abnormality in the second embodiment is detected. The means 10 is turned on.

  As described above, the present invention can detect an imbalance abnormality of a three-phase power source from a detection value of a current sensor, so that it can protect not only an air conditioner but also other high-power devices using a three-phase power source. It can be applied.

Configuration block diagram of an air conditioner in Embodiment 1 of the present invention Configuration block diagram of an air conditioner in Embodiment 2 of the present invention Configuration block diagram of an air conditioner in Embodiment 3 of the present invention Configuration block diagram of an air conditioner in Embodiment 4 of the present invention Configuration block diagram of an air conditioner in Embodiment 5 of the present invention Timing chart of air conditioner in Embodiments 1 to 5 of the present invention Configuration block diagram of a conventional air conditioner

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Current sensor 3 Rotation speed setting means 4 Capacity setting means 5 Operation control means 6 Current storage means at start-up 7 Current setting means at start-up 8 Timer means 9 Unbalance abnormality display means 10 Current sensor abnormality display means

Claims (5)

A current sensor that detects the power supply current and converts it into a voltage, a rotation speed setting means that sets the rotation speed of the compressor at the time of unbalance detection after the start of the air conditioner, and a capacity setting that sets the capacity of the air conditioner And an operation control means for controlling the operation of the air conditioner. When the compressor of the air conditioner has reached the rotation speed designated by the rotation speed setting means, the operation control means is predetermined by the capacity setting means. An air conditioner characterized in that a current value corresponding to an unbalanced voltage abnormality in the number of capabilities is calculated, and a power supply unbalanced abnormality is determined if the current is equal to or less than the current value. The air conditioner according to claim 1, further comprising a current storage means at the time of starting the compressor, wherein the operation control means detects the rotation speed of the compressor after the start, and at a predetermined rotation speed, from the current sensor The air conditioner is characterized by determining that the current sensor is abnormal when the voltage of the compressor does not change from the voltage at the time of starting the compressor. 3. The air conditioner according to claim 1, further comprising unbalanced current setting means for setting a current value for determining a power supply unbalance abnormality at the time of starting the compressor, wherein the air conditioner is not activated at the time of starting. An air conditioner characterized in that when the current value is less than or equal to the current value set by the balanced current setting means, it is determined that the power supply is unbalanced and the operation of the air conditioner is stopped. The air conditioner according to any one of claims 1 to 3, wherein a timer for measuring a certain time after starting the compressor is provided, and a current value at the time of starting and a current after the timer time has elapsed after starting the compressor. An air conditioner characterized by calculating an inclination with a value and determining that the inclination is within a predetermined range of an unbalanced abnormality and determining that the power supply is unbalanced and stopping the operation. Claims 1 to 4 are provided with unbalance abnormality display means for notifying abnormality detection at the time of power supply unbalance abnormality and current sensor abnormality display means for displaying current sensor abnormality when detected in claim 2, An air conditioner characterized in that an unbalanced abnormality display means is turned on when an unbalanced abnormality is detected, and a current sensor abnormality display means is turned on when a current sensor abnormality is detected to distinguish the current sensor abnormality. .

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