JPS6380795A - Inverter air conditioner - Google Patents

Abstract

PURPOSE:To reduce the load of a microcomputer thereby to accelerate the calculating speed of a V/F pattern by providing mean for calculating the pattern at a room side and a remote control side. CONSTITUTION:V/F pattern calculating means 14 is provided at a room side 1, and connected to a microcomputer 5. V/F pattern calculating means 16 connected to a microcomputer 15 is provided at a remote control side 4. V/F pattern calculated by the means 16 is stored in a RAM 17 provided at the outdoor side 6. Whether the pattern is calculated at room side 1 or remote control side 4 is judged, the V/F pattern calculation is executed at a position responsive to the judged result, data is transmitted from the room side 1 or the remote control side 4 to the outdoor side 6, and stored in the RAM 17. A compressor 9 is controlled in response to the pattern.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention freely changes the relationship between the line voltage of an induction motor that drives a compressor and the rotation frequency of the compressor (hereinafter referred to as the V-F pattern). In order to be able to do this, the means for calculating the V-F pattern is provided on the remote control side and on the indoor side, and the data of This invention relates to an inverter air conditioner.

[Conventional technology]

FIG. 7 is a block diagram showing a conventional inverter air conditioner. In this FIG. 7, 1 is the indoor side,
2 is a rectifier circuit unit that rectifies the commercial power supply E, 3 is a temperature detection element that detects the temperature of the indoor side 1, 4 is a remote controller (hereinafter referred to as remote control), and 5 is a microcontroller operated by the DC output of the rectifier circuit unit 2. A computer, to which a temperature detection element 3 and a remote controller 4 are connected. 6 is an outdoor side, 7 is a rectifier circuit unit that rectifies the commercial power source E, 8 is a power transistor that switches the rectified output of the rectifier circuit unit 7 and outputs a pseudo AC waveform, 9 is a compressor that has an induction motor inside, 10 is an overcurrent detector, 1
1 is a DC-DC converter that converts the output of the rectifier circuit 7 into a power supply level for driving an electronic circuit; 12 is a microcomputer operated by the output of the DC-DC converter 11;
(hereinafter referred to as ROM).

In the inverter air conditioner configured as described above, the outdoor side 6 has a rectifier circuit section 7 that smoothes the commercial power source E to convert it into DC, and converts this DC into AC to drive the compressor 9. In order to do this, the power transistor 8 is switched by the microcomputer 12.

The microcomputer 12 is provided with a ROM 12a that stores a V-F pattern for determining the line voltage and frequency to be applied to the induction motor that drives the compressor 9 according to the frequency of the pseudo AC. . Further, to protect the power transistor 8, an overcurrent detector 10 is provided between the power transistor 8 and the rectifier circuit section 7. Furthermore, the DC output voltage of the rectifier circuit section 7 is
The voltage is supplied to the DC-DC converter 11, where it is converted into a predetermined low-voltage DC voltage and supplied to the microcomputer 12.

On the other hand, on the indoor side 1, a commercial power source E is rectified in a rectifier circuit section 2 to convert it into direct current, which is used as a power source for a microcomputer 5. The microcomputer 5 sends the difference between the set temperature of the remote controller 4 and the temperature detected by the temperature detection element 3 provided on the indoor side 1, that is, a temperature difference signal, to the microcomputer 5 via the crossover wire 13 from the outdoor side 6. The data is transferred to the computer 12. Then, the microcomputer 12 on the outdoor side 6 determines the rotation speed of the compressor 9 based on this temperature difference signal.

This type of conventional technology is also disclosed in, for example, Japanese Patent Laid-Open No. 60-49895.

[Problem that the invention seeks to solve]

Since the conventional inverter air conditioner is configured as described above, when the pressure in the refrigerant circuit is high or the load fluctuation is large, only - V-F patterns can be stored in the ROM 12.
Since it is not stored in a, the V-F pattern cannot be changed. For this reason, when the overcurrent detector is activated, it is necessary to reduce the frequency of the compressor and allow it to rotate, or to stop the compressor and wait until the pressure in the refrigerant circuit decreases.

This invention was made to solve this problem, and even if the pressure is high or the overcurrent detector is activated, it can be activated without waiting until the pressure in the refrigerant circuit drops. An object of the present invention is to obtain an inverter air conditioner which can be driven without lowering the compressor frequency even when the pressure is high.

[Means for solving problems]

The inverter air conditioner according to the present invention includes a RAM provided outside the room and storing data of a V-F pattern;
Means for calculating the V-F pattern are provided on the indoor side and on the remote control side, respectively.

[For production]

In this invention, means for calculating line voltage data with respect to the frequency F of the compressor are provided on the indoor side and on the remote control side, and it is determined whether the above calculation can be performed on the remote control side or on the indoor side. By executing the ■-F pattern calculation at a location according to the judgment result and transmitting the data from the indoor side or the remote control side to the outdoor side, the ■-F pattern is corrected and stored in the RAM, and this V The V-F pattern can be changed by driving and controlling the 11 compressors according to the -F pattern.

[Embodiments of the invention]

The inverter air conditioner according to the present invention will be explained below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of an inverter air conditioner according to the present invention, in which the same parts as those in FIG. 6 are indicated using the same reference numerals to prevent redundant explanation, and parts different from those in FIG. Mainly explained.

In FIG. 1, reference numeral 14 represents a V-F pattern calculation means provided on the indoor side 1, and is connected to the microcomputer 5. 15 is a microcomputer that constitutes the remote controller 4; 16 is a V-F pattern calculating means connected to the microcomputer 15; 17 is an R-AM provided on the outdoor side 6 and connected to the microcomputer 12; The V-F pattern calculated by the -F pattern calculation means 14 is stored.

Next, the operation of the above embodiment will be explained with reference to the flowcharts shown in FIGS. 2, 3, and 4.

The flowchart shown in FIG. 2 shows the processing procedure in the microcomputer 12 on the outdoor side 6, the flowchart shown in FIG. 3 shows the processing procedure in the microcomputer 5 on the indoor side 1, and the flowchart shown in FIG. The flowchart shown shows the processing procedure in the microcomputer 16 on the remote control 4 side.

First, a case where the conventional V-F pattern is used will be explained. In step S1, a temperature difference signal during cooling is transferred from the indoor side 1 to the outdoor side 6 via the line 13. Then, on the outdoor side 6, this temperature difference signal is received in step 5AIO, a frequency F is set accordingly in step 5AII, and a line gap of the induction motor for driving the compressor with respect to the frequency F is set in step 5A12. The voltage V is read from the RAM 17, and the compressor 6 is driven accordingly. Next, in step 5A13, it is determined whether the current value flowing through the power transistor 8 is at a level at which it stalls, and if the determination result is NO, the process moves to step 5AI4, and the current value flowing through the power transistor 8 is Determine whether it is at the cutoff level or not. If the determination in step 5A14 is No, the process moves to step 5A15 and is transferred to the indoor side as "no stall and no shutoff". On the indoor side 1, even if it is determined that there is no stall or cutoff on the outdoor side 6, the process returns to step s1 of the processing routine.

Next, the case where there is a stall and a shutdown will be explained.

First, in step 5A13, the power transistor 8
If the overcurrent detector 10 detects that the current value flowing through the terminal is at a level that causes a stall, step 5A2
Transition to 0. In step 5A20, as shown in FIG. 5, Δf
After decelerating the frequency to , the process moves to step 5A21 and the compressor frequency is fixed at Δf.

Next, in step 5A22, data on the stalled frequency, detected current value, and pressure are transferred from the microcomputer 12 to the microcomputer 5 via the line 13 (7). In step 6, it is determined that there has been a stall, and the process proceeds to step 5A22.
The data transferred in step SIO is received in step SIO.

Next, in step Sll, the processing status of the microcomputers on the remote controller 4 side and the indoor side 1 is checked to determine whether the V-F pattern can be calculated on the indoor side. Here, if it is possible to calculate the V-F pattern on the indoor side 1, the load condition of the refrigerant circuit is determined in step S12 based on the data transferred in step SA22, and the V-F pattern is calculated. This is executed in the V-F pattern calculation means 16. Next, step S1
3, the frequency Δf shown in FIG.
, the line voltage (2) from La to Lb shown in the graph is corrected, and the data value of the voltage V corresponding to frequencies Δf to Δf2 is transferred from the indoor side 1 to the outdoor side 6. Then, the data transferred in step S13 is transferred to step S13.
After storing it in the RAM 15 on the outdoor side 6 at A23,
After moving to step 5A24 and returning the rotational frequency of the compressor to the original frequency F, the process returns to step 5AIO.

In addition, in the process of step Sll, if it is determined that the V-F pattern calculation process cannot be processed indoors, the data transferred in step $A22 is transferred to the remote controller 4 in step S6. do. In this way, in step SRI, the remote controller 4 receives the data transferred in step SA2, determines that there is a stall, and calculates the V-F pattern from the relationship between frequency, pressure, and current value in step SR6. will be held. In step SR7, the data value of the voltage V from Δf to Δft centered around the frequency at which the stall occurred is transferred to the indoor side 1, and the process returns to step SRI. Therefore,
The indoor side 1 transfers the data in step SR7 to the outdoor side in step S7, stores it in the RAM 15 of the outdoor side 6 in step 5A23, and then returns the compressor frequency to the original frequency F in step 5A24.
Return to AIO processing.

Next, in step 5A14, if it is determined that the current value flowing through the power transistor 8 is at a level that requires shutoff, the process moves to step 5AI6 and the compressor is stopped.

Next, in step 5A17, information on frequency, pressure, and whether voltage is cut off is transferred to the indoor side 1.

Then, in the indoor side 1, in step S3, the outdoor side 6
It is determined that there has been a cutoff, and the data to be transferred in step 5A17 is received in step S4. Next, in step S5, the processing status of the microcomputers on the remote control 4 side and the indoor side 1 is checked, and the V-
Determine whether calculation of F pattern is possible. here,
If it is possible to calculate the V-F pattern on the indoor side 1, in step S8, the load condition of the refrigerant circuit is determined based on the frequency, pressure, and current value data received in step S4, and the V-F pattern is calculated. The calculation is performed in the V-F pattern calculation means 14.

Next, in step S9, as shown in graphs L to Lc shown in FIG.
After correcting the data value of ■ from min to the highest frequency f max, it is transferred from the indoor side 1 to the outdoor side 6 side.

The data transferred in step S9 is the corrected graph data of Lc, which is transferred to step 5A1.
8, the data is stored in the RAM 15 on the outdoor side 6. In step 5A19, after starting the drive of the compressor, step 5A19
Return to AIO processing.

Further, in the process of step S5, the indoor side 1 is V-F
If the pattern cannot be calculated, the data in step 5A17 is transferred to the remote controller 4 in step S6. Then, the remote controller 4 receives the data transferred in step 5A17 in step SRI and determines that there has been a cutoff, and in step SR4, the load condition of the refrigerant circuit is determined from the frequency and pressure current value, and V-
The calculation of the F pattern is executed by the V-F pattern calculation means 14. Next, in step SR5, as shown from graph L to graph Lc shown in FIG.
After correcting the value of ■ from the lowest frequency f min to the highest frequency f n+ax, the received data is transferred to the outdoor side in step S7.

The data transferred in this step S7 is the corrected graph data of Lc, which is the graph data of step 5A18.
In step 5A19, the compressor 9 is started to be driven.

〔Effect of the invention〕

As explained above, this invention is based on the frequency of the compressor and the B? , a means for calculating the V-F pattern with the line voltage V of the conductive motor is provided on the indoor side and on the remote control side,
The load on the microcomputer is reduced by looking at the processing status of the microcomputer on either the indoor side or the remote control side and calculating the V-F pattern on either side. This will speed up calculation processing. In addition, there is a V-F on the outside of the room.
In addition to providing a RAM to store pattern data,
Induction motor line voltage with respect to compressor rotation frequency F■
Since this data is transferred from the indoor side to the outdoor side, the V-F pattern can be easily corrected, and this will prevent the compressor from stalling or when the power transistor current is cut off. Even if detected, the compressor can continue operating without lowering the rotational frequency or stopping the compressor.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the inverter air conditioner according to the present invention, FIG. 2 is a flowchart showing the operation of the outdoor side of the inverter air conditioner shown in FIG. 1, and FIG. A flowchart showing the operation of the indoor side of the inverter air conditioner shown in the figure.
Flowchart showing the operation of the remote control in the inverter air conditioner shown in the figure, Figure 5 is a characteristic diagram showing the relationship between the rotation frequency of the compressor and the line voltage when the compressor stalls, and Figure 6 is the power transistor FIG. 7 is a block diagram of a conventional inverter air conditioner. 1 is the indoor side, 3 is the temperature detection element, 4 is the remote controller, 5 is the microcontroller, 6 is the outdoor side, 8 is the power transistor, 9 is the compressor, IO is the overcurrent detector, 11 is the DC-DC converter, 12 read-only memory (ROM), 13 crossover wire, 1
4 is a V-F pattern calculation means, 15 is a microcomputer, 16 is a V-F pattern calculation means, and 17 is a random access memory (RAM). In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa (2 others) Fig. 4 Δf, : Δr2 F = Compressor frequency F → Fig. 6 fmin f max Compressor frequency F → Procedural amendment (voluntary) Showa year, month, day 2, Name of the invention: Inverter air conditioner 3, relationship with the case of the person making the amendment Patent applicant address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki 4, Attorney Address 2-2-3-5 Marunouchi, Chiyoda-ku, Tokyo
, Subject of amendment (1) Column 6 for detailed explanation of the invention in the specification and Contents of amendment column are provided. ” he corrected. (To) On page 11, line 20, it says "stored in 15".
Correct it to "store at 17". (31, p. 14, line 8, rRAM15J, r
RAM17".

Claims (1)

[Claims] An outdoor rectifier circuit that rectifies AC power, a power transistor that outputs a pseudo AC waveform by switching the output of this rectifier circuit and drives the induction motor inside the compressor, and a An overcurrent detector detects the fluctuating inflow current of the power transistor, and the detected value by the overcurrent detector is determined to be the current value by detecting the stall current value of the compressor or the level at which the power transistor is cut off. The outdoor microcomputer transmits the compressor rotation frequency and refrigerant pressure at that time to the indoor side, and the indoor microcomputer uses this transferred data to determine whether the compressor stalls or the power transistor current is cut off. The above induction motor Means for calculating the line voltage of and storing the data on the indoor side and transmitting the data to the outdoor side to return the rotational frequency of the compressor to the original frequency, and the above V transferred by this means. - An inverter air conditioner characterized by comprising: a rewritable storage means for storing an F pattern.