JP2009268189A - Controller of air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller of an air conditioner with an inexpensive configuration, which protects a three-phase four-line AC power supply during phase loss. <P>SOLUTION: The controller is configured so that an excitation coil portion of a third three-phase power supply switching means 3 is connected in series between an S-phase power supply line of a three-phase four-line AC power supply and a neutral point power supply line; an excitation coil portion of a first three-phase power supply switching means 10 is connected in series between an R-phase power supply line and the neutral point power supply line; and a switching portion between the control circuit means 2 and the first three-phase power supply switching means 10, an excitation coil portion of the second three-phase power supply switching means 11 and an switching portion of a third three-phase power supply switching means 3 are connected in series between the neutral point power supply line and a T-phase power supply line. Even if any one of phases is lost, the switching portion of the second three-phase power supply switching means 11 operates with at least the three-phase four line power supply line. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a phase loss detection technique for an air conditioner using a three-phase four-wire AC power source.

  Conventionally, this type of air conditioner has been devised to input the line voltage of each of the three-phase power supply, generate a pulse synchronized with the interphase voltage of the power supply, and detect the interruption of the pulse ( For example, see Patent Document 1).

  FIG. 3 shows a conventional phase loss detection technique described in Patent Document 1. In FIG. As shown in FIG. 3, a line voltage is connected to a pulse generation circuit 25 from a three-phase three-wire three-phase power source 21 via a connection terminal 22. The pulse generation circuit 25 is connected to a signal processing circuit 26 and includes an open / close Ry 23 and a display means 29. With this configuration, since the pulse generation circuit 25 inputs the line voltage of the three-phase power source 21, it is possible to generate a pulse synchronized with the phase voltage.

Thus, the interruption of a pulse of a specific phase is detected, and the signal processing circuit 26 cuts off the energization of the open / close Ry 23 and displays an abnormality on the display means 29.
Japanese Patent Laid-Open No. 09-308083

  However, although the conventional configuration is effective for detecting and controlling the line voltage (AC200V) in a three-phase three-wire AC power source in Japan, a three-phase four-wire AC power source such as Europe and China. In this case, the line voltage becomes AC 380V to 415V, so that the components used in the pulse generation circuit 25 are required to have high voltage components, and there is a problem that leads to cost increase in addition to the increase in size of the components.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an inverter air conditioner control device that realizes phase loss detection in a three-phase four-wire AC power supply with a simple configuration.

  In order to solve the above-mentioned conventional problems, in an air conditioner driven by an inverter operated by a three-phase four-wire AC power source, a three-phase wire (hereinafter referred to as a three-phase four-wire AC power source) is provided inside the air conditioner. , Each of which is referred to as an R-phase power line, an S-phase power line, and a T-phase power line) and a neutral point power line, and a third three-phase power source between the S-phase power line and the neutral point power line. The excitation coil section of the switching means, the excitation coil section of the first three-phase power supply switching means between the R phase power line and the neutral point power line, and the control circuit between the T phase power line and the neutral point power line And an opening / closing part of the first three-phase power supply switching means, an exciting coil part of the second three-phase power supply switching means, and an opening / closing part of the third three-phase power supply switching means are connected in series.・ The S-phase power line and T-phase power line are connected to the opening / closing part of the second three-phase power switching means, smoothing means, inverter driving means, and compressor. And, at least three-phase four-wire power line, which phase is also open-phase, in which the control for opening operation of the opening and closing portion of the second three-phase power supply switching means.

  This makes it possible to detect an open phase by using a neutral point power line of a three-phase four-wire AC power source and detecting the voltage.

The control device for an air conditioner of the present invention uses a neutral point power line unique to a three-phase four-wire AC power source, and the contact point of the neutral point power line and the R / S two-phase voltage detection method is T Because the excitation coil part of the second three-phase power supply switching means provided between the phase and the neutral point power supply line is excited, the low voltage (line voltage 1 / √3), it is possible to use small parts and to detect a phase failure reliably with a simple (cheap) structure.

In an air conditioner driven by an inverter operated by a three-phase four-wire AC power source, the air conditioner has three-phase four-wire AC power source three-phase wires (hereinafter referred to as R-phase power source and S-phase power source, respectively). Line and T-phase power line) and a neutral point power line, and between the S-phase power line and the neutral point power line, an exciting coil section of the third three-phase power switching means is provided. The exciting coil portion of the first three-phase power supply switching means is between the power supply line and the neutral point power supply line, and the control circuit means and the first three-phase power supply switching means are between the T-phase power supply line and the neutral point power supply line. An open / close section, an exciting coil section of the second three-phase power supply switching means, and an open / close section of the third three-phase power switch means are connected in series, and the R-phase power line, S-phase power line, T-phase power line Consists of an open / close section, smoothing means, inverter driving means, and compressor of the second three-phase power supply switching means, and is configured with at least a three-phase four-wire power supply. In which phases also phase loss, allowing low cost open phase detection with a simple configuration for the opening and closing unit is opened operation of the second three-phase power supply switching means.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a block diagram of a control device according to Embodiment 1 of the present invention, and FIG. 2 is a flowchart showing its control operation.

  In FIG. 1, 1 is a control device, and 2 is a control circuit means. 3 is a third three-phase power switching means, 10 is a first three-phase power switching means, 11 is a second three-phase power switching means, and is represented by an switching relay in the present application. The exciting coil portion of the power switching means 10 is connected between the R-phase power line 9r and the neutral point power line 9n. Further, the contact portion of the first three-phase power supply switching means 10 extends from the contact portion of the third three-phase power supply switch means 3 through the excitation coil portion of the second three-phase power supply switch means 11 from the T-phase power supply line 9t. It is connected to the sex point power line 9n. The exciting coil part of the third three-phase power supply switching means 3 is connected between the S-phase power supply line 9s and the neutral point power supply line 9n. The contact portion of the second three-phase power supply switching means 11 is for three contacts, and the contact is connected to the R-phase power supply line 9r, S-phase power supply line 9s, T-phase power supply line 9t on the power supply side, and on the load side Are connected in the order of smoothing means 7, inverter driving means 6, and compressor 8. A communication means 5 is connected to the control circuit means 2 and the inverter driving means 6. The control circuit means 2 is connected between the T-phase power line 9t and the neutral point power line 9n.

  The operation and action of the control device configured as described above will be described below with reference to the flowchart of FIG.

  First, when the three-phase four-wire AC power supply is normally connected to the control device 1 of the air conditioner, the control circuit means 2 is energized (S1). Thereafter, the exciting coil portion of the third three-phase power supply switching means 3 is excited, and the contact portion of the third three-phase power supply switching means 3 is closed (S2). At the same time, the exciting coil portion of the first three-phase power supply switching means 10 is excited, and the contact portion of the first three-phase power supply switching means 10 is closed (S3). By the operations of (S2) and (S3), the exciting coil portion of the second three-phase power supply switching means 11 is excited, and the contact portion of the second three-phase power supply switching means 11 is closed (S4).

Next, a case where a three-phase four-wire AC power supply is not normally connected to the control device 1 of the air conditioner and one of the phases is lost will be described. During the T-phase and N-phase open phases, the exciting coil section of the second three-phase power supply switching means 11 is always cut off and is not excited (S5). Therefore, the contact part of the first three-phase power supply switching means 10 and the contact part of the third three-phase power supply switching means 3 remain open. Therefore, the contact portion of the second three-phase power switching means 11 is opened (S8) without being excited by the exciting coil section of the second three-phase power switching means 11. When the R phase is missing, the excitation coil portion of the first three-phase power supply switching means 10 is not excited. Therefore, the contact portion of the first three-phase power switching means 10 is opened (S6). Therefore, the exciting coil portion of the second three-phase power supply switching means 11 is not excited (S5), and the contact portion of the second three-phase power supply switching means 11 is opened (S8). Similarly, when the S phase is missing, the excitation coil portion of the third three-phase power supply switching means 3 is not excited. Therefore, the contact portion of the third three-phase power supply switching means 3 opens (S7). Therefore, the exciting coil portion of the second three-phase power supply switching means 11 is not excited (S5), and the contact portion of the second three-phase power supply switching means 11 is opened (S8).

  As described above, in the present embodiment, the neutral point power line unique to the three-phase four-wire AC power supply is used, and the contact point of the neutral point power line and the R / S two-phase voltage detection method is provided. Since the excitation coil part of the second three-phase power supply switching means provided between the T-phase and the neutral point power supply line is excited, the voltage (line voltage) is lower than the detection method between the three-phase lines. Therefore, it is possible to reliably detect the phase loss with a simple (inexpensive) configuration.

  As described above, the control device for an air conditioner according to the present invention is configured using the neutral point power supply line of the three-phase four-wire AC power supply, and therefore can detect a high voltage phase loss at a low voltage. . Therefore, it can be applied particularly to overseas specifications (Europe and China) and high-capacity refrigeration equipment.

Configuration block diagram of a control device for an air conditioner in Embodiment 1 of the present invention The flowchart which shows operation | movement of the control apparatus of the air conditioner in Embodiment 1 of this invention. Configuration block diagram of a conventional control device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control apparatus 2 Control circuit means 3 3rd 3 phase power supply switching means 5 Communication means 6 Inverter drive means 7 Smoothing means 8 Compressor 9r R phase power supply line 9s S phase power supply line 9t T phase power supply line 9n Neutral point power supply line 10 First three-phase power source switching means 11 Second three-phase power source switching means

Claims (1)

In an air conditioner driven by an inverter operated by a three-phase four-wire AC power source, the air conditioner has three-phase four-wire AC power source three-phase wires (hereinafter referred to as R-phase power source and S-phase power source, respectively). And a neutral point power line, and an excitation coil portion of a third three-phase power switching means is connected between the S phase power line and the neutral point power line, An exciting coil section of the first three-phase power supply switching means is connected between the R-phase power supply line and the neutral point power supply line, and the control circuit means and the first three-phase power supply means are connected between the T-phase power supply line and the neutral point power supply line. An opening / closing part of the phase power supply switching means, an exciting coil part of the second three-phase power supply switching means, and an opening / closing part of the third three-phase power supply switching means are connected in series, and the R-phase power line, S-phase power line, The T-phase power line is configured by connecting the opening / closing part, the smoothing means, the inverter driving means, and the compressor of the second three-phase power supply switching means, and at least three-phase Linear equation in the power line, any phase with open-phase, the control device of the air conditioner is characterized in that to opening operation of the opening and closing portion of the second three-phase power supply switching means.

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