JPS63254382A - Compressor-starting control system of refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a compressor start control system for a refrigerator that controls the start of a compressor according to fluctuations in power supply voltage.

(Prior art) In conventional refrigerators, the internal temperature is detected by a detector, and when the detected temperature reaches the compressor on temperature, the compressor is energized and started, and the detected temperature also reaches the compressor off temperature. Then, the compressor is cut off and stopped, thereby controlling the drive of the compressor.

(Problems to be Solved by the Invention) By the way, in regions with poor power conditions, especially in foreign countries, the power supply voltage from the power system fluctuates at short time intervals and the range of fluctuation is large. Therefore, when a refrigerator is used in such an area, the compressor may have trouble starting when electricity is applied to the compressor. At this time, the overload relay normally activates and turns off the power. However, since the overload relay subsequently returned to normal operation, the compressor would once again cause a startup failure, and such a situation would be repeated. Especially the overlow 1 relay!
! If there is a malfunction such as slow operation of the i-melon, the power breaker will be shut off.
is activated, causing a power outage or the compressor motor
M (Sometimes I did M.

Such problems are often seen in cases where refrigerators are exported to foreign countries with poor electricity conditions.

Therefore, an object of the present invention is to provide a compressor startup control device that can control the compressor to prevent startup failures even when there are fluctuations in the power supply voltage, thereby eliminating problems such as power outages and burnout of the compressor motor. is to provide.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a temperature comparison method that compares internal temperature data inputted from an internal temperature detector and compressor drive start temperature data stored in a memory in advance. voltage comparison means for comparing the power supply voltage data inputted from the power supply voltage detector with the minimum voltage data at which the compressor can be started stored in the memory in advance; and a compressor driving means for storing the power supply voltage data in a memory and outputting a compressor drive signal when the power supply voltage data is not smaller than the minimum voltage data at which the compressor can be started, and determining whether to start the compressor after the compressor drive signal is output. After a reference time has elapsed, the compressor starting state determining means determines whether the compressor starting is normal or abnormal. Minimum startable voltage data,
The present invention is characterized in that the compressor startable minimum voltage data is corrected based on a difference with power supply voltage data stored in the memory and stored in the memory.

(Function) Before the compressor is energized based on the compressor drive signal, power supply voltage data is read and stored. Then, when the compressor is driven by the output of the compressor drive signal and a compressor start-up determination reference time in which the compressor is considered to have reached steady rotation has elapsed, the compressor start-up state determining means determines whether the compressor start-up is normal or abnormal. When the determination result is abnormal, in other words, when a startup failure occurs, the compressor is de-energized by stopping the output of the compressor drive signal. In this case, if the compressor startable minimum voltage data remains unchanged, it is assumed that a starting failure will occur again when the compressor is energized thereafter, and the compressor startable minimum voltage data is corrected and stored. Therefore, when the compressor is energized after this, the compressor will not be energized with the same power supply voltage as last time. ”-The minimum 7 compressor pressure data that can be used to start the compressor are corrected one after another, so there will be no start-up failure of the compressor.

(Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

First, in FIG. 2, numeral 1 denotes a compressor, which is connected between bus bars 2a and 2b of an AC power source 2 via an output contact (not shown) of a drive circuit 3.

4 is a power supply voltage detector, which includes a power supply voltage detection transformer 5, a rectifying and smoothing circuit 6 that converts the secondary side AC output of this into DC, and digitally processing this DC output voltage to obtain power supply voltage data. It also includes an A/D converter 7 that outputs Lv. Next, in FIG. 1, reference numeral 8 denotes an internal temperature detector, which detects the internal temperature and outputs internal temperature data Ti.

Reference numeral 9 denotes a control circuit consisting of a microcomputer, which has a CPU, RAM, ROM, and a human output interface. Thus, this control circuit 9 serves as temperature comparison means, voltage comparison means, compressor drive means, and compressor activation state determination means. The ROM stores a control program and various data, and the data includes compressor drive start temperature data T on, compressor startable minimum voltage data Sv, and the like.

Now, the functions of the control circuit 9 will be explained with reference to the flowchart shown in FIG.

First, when the power switch is turned on, as shown in step S1, the compressor startable minimum pressure data SV of 71i, which has been previously stored in the ROM by the manufacturer, is transferred to the RAM. Then, in step S2, the set time x (0 to 1
Wait for the elapsed time (value consisting of 08 minutes). This set time X is a restart compensation time for the compressor 1. After this step S
In step S3, the internal temperature data Ti inputted from the internal temperature detector 8 is compared with the compressor drive start temperature data Ton, and when the internal temperature data Ti exceeds the compressor drive start temperature data Ton, the process moves to step S4. ,
In this step S4, the power supply voltage data LV is compared with the compressor startable minimum voltage data Sv. , and if the power supply voltage data Lv is equal to or higher than the compressor startable minimum voltage data Sv, the process moves to the next step S, where the current power supply voltage data Lv is stored in the RAM, and at the same time, the compressor drive signal Sc is set in step S6. Output.

This compressor drive signal Sc turns on the output contact of the drive circuit 3, and the compressor 1 is energized. In other words,
The compressor 1 is energized when the internal temperature data Ti is not smaller than the compressor drive start temperature data Ton and the power supply voltage data Lv is not smaller than the compressor startable minimum voltage data Sv. Thereafter, as shown in the next step S7, it is waited for the set time, that is, the compressor start-up determination reference time 3/(a value consisting of 0 to 10 seconds) to elapse. The purpose of waiting for the compressor start-up determination reference time y is the time when the compressor 1 is considered to reach steady rotation. On the other hand, when this compressor start determination reference time y has elapsed, the process moves to step S8.
Determine whether the startup is normal or abnormal. When the compressor 1 is energized, a large starting current flows, so the power supply voltage data Lv of the power supply voltage detector 4 temporarily drops, but if it starts normally, the compressor startup judgment reference time during which steady rotation is expected. At the time point y has elapsed, the power supply voltage data Lv returns to the power supply voltage data before energization. Conversely, if the startup of the compressor 1 is abnormal, that is, if a startup failure occurs, the overcurrent will continue to flow through the compressor 1, and the power supply voltage Lv will continue to drop. In this step S8, it is determined that the power supply voltage data Lv is equal to or higher than the compressor startable minimum voltage data Sv]2, and it is determined that the compressor 1 is normally started, and the process proceeds to step S9. This step S.

Then, it is determined whether the internal temperature data Ti has fallen below the compressor drive stop temperature data Torr, that is, whether the internal temperature has reached the lower limit set temperature due to the operation of the compressor 1, and the compressor drive stop temperature data T on' is determined. If the value falls below this, as seen from step SIO, the output of the compressor drive signal Sc is stopped and the process returns to step S2.

Here, in step S6, if the power supply voltage data Lv at this point falls below the minimum voltage data Sv that allows the compressor to start, it is determined that the compressor 1 has a startup failure, and the process proceeds to step S11, where the compressor drive signal Sc Stop the output of I:.

The power to the compressor 1 is cut off. Then, in the next step S12, the first stored compressor startable minimum voltage data Sv is combined with the compressor startable minimum voltage data Sv and the power supply voltage data L'v before energization of the compressor 1 (step S).

For convenience, the power supply voltage data Lv stored in
Correct based on the difference between In other words, one of the requirements for outputting the compressor drive signal Sc in step S6 is that the power supply voltage data Lv before compressor 1 is energized is equal to or higher than the minimum voltage data Sv for starting the compressor. However, when this requirement is met, However, as can be seen from step S8, startup failure may actually occur due to fluctuations in the power supply voltage. In order to eliminate this, for example, the following calculation is performed to compensate for the compressor startable minimum voltage data Sv.

5v-8v+a (LVO-8v) α (Complement 1 [Coefficient N: 0.1~5 As can be seen from this calculation, the smaller the minimum voltage data Sv that can start the compressor with respect to the power supply voltage data Lv, the higher this value is. Therefore, after this, in step S4, the compressor starting IIJ performance minimum voltage data Sv
has already been supplemented to a higher value, so if the content value of power supply voltage data Lv is the same as the previous power supply voltage data LVO (the power supply voltage when the startup failure occurred last time), Lv<Sv
While the program execution ends at step s4, the compressor 1 is not energized. Therefore, the startup failure will not occur again. Even if the startup failure occurs again, the compressor will be cut off after 11°C, and the minimum voltage data Sv for starting the compressor will be corrected each time, so there will be no risk of burnout of the compressor motor, etc. It is possible to control the compressor so as to eliminate the occurrence of startup failures while preventing this.

- Figures 4 and 5 show a second embodiment of the present invention 1-1, and this embodiment differs from the first embodiment in the following points. In this second embodiment, as can be seen from FIG.
As can be seen from FIG. 5, the current detection data Ra, which is the input current value by the compressor current detector 10, and the current reference data Sa for judgment stored in advance in the control circuit by the manufacturer. Compare step SB
), if Ra>Sa, it is determined that an abnormality in starting the compressor, that is, a starting failure has occurred. In this second embodiment as well, the same effects as in the first embodiment can be obtained.

[Effects of the Invention] Note: As is clear from the above description of the present invention, when the compressor has a startup failure due to fluctuations in the power supply voltage, the power to the compressor is immediately cut off, and the minimum voltage data Sv at which the compressor can be started is set. I will correct it each time,
This has the excellent effect of being able to control the compressor to prevent failure to start while preventing power outages and burnout of the compressor motor.

[Brief explanation of drawings]

1 to 3 show a first embodiment of the present invention.
Figure 2 is a block diagram of the control system, Figure 2 is an electric circuit diagram of the compressor and power supply voltage detector, Figure 3 is a flowchart of the control program, and Figures 4 and 5 are the second diagram of the present invention. FIG. 1 is a diagram corresponding to FIG. 1 and FIG. 3 is a diagram corresponding to FIG. 3, respectively, showing an embodiment of the present invention. 1 is a compressor, 2 is an AC power supply, 4 is a power supply voltage detector, 8 is a refrigerator temperature detector, 9 is a control circuit (temperature comparison means,
voltage comparison means, compressor drive means, compressor activation state determination means), and 10 is a compressor current detector.

Claims (3)

[Claims] 1. Temperature comparison means for comparing the internal temperature data inputted from the internal temperature detector with the compressor drive start temperature data stored in the memory in advance, and the power supply voltage data inputted from the power supply voltage detector and stored in the memory in advance. voltage comparison means for comparing the minimum voltage data at which the compressor can be started; and voltage comparison means for comparing the minimum voltage data at which the compressor can be started; Compressor driving means for storing voltage data in a memory and outputting a compressor driving signal; and compressor starting state determining means for determining whether the compressor starting is normal or abnormal after a compressor starting determination reference time has elapsed since the compressor driving signal was output. The determination result of the compressor startup state determining means is abnormal, and the minimum voltage data that allows the compressor to start is determined based on the difference between the minimum voltage data that allows the compressor to start and the power supply voltage data stored in the memory. A refrigerator compressor start control system that corrects and stores the corrected information in a memory. 2. The refrigerator according to claim 1, wherein the compressor startup state determination means determines whether the startup of the compressor is normal or abnormal based on power supply voltage data from a power supply voltage detector. Compressor start control system. 3. The compressor startup state determination means determines whether the compressor startup is normal or not based on the input current value of the compressor.
The compressor start control system for a refrigerator according to claim 1, wherein the system is configured to determine an abnormality.