JPS60226686A - Controller for operation 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 2.-7. Industrial Application Field The present invention relates to an operation control device for a refrigerated storage room such as a refrigerator or a showcase.

Conventional Structure and Its Problems The structure of a conventional refrigerator operation control device is shown in FIG. Reference numeral 1 indicates an internal temperature detection means for detecting the internal temperature of the refrigerator, 2 indicates a set temperature detection means for detecting the set temperature, and 3 detects the amount of frost accumulated in the cooler, and issues a defrosting start signal when a predetermined amount of frost is reached. 4 is a defrosting end detecting means that detects when the temperature of the cooler reaches a predetermined temperature or higher during defrosting and ends the defrosting. 5 is a control means with an input spacer IO,
11°I2. I3. Output terminal 00. It has ol.

Then, the inputs from the internal temperature detection means 1 and the set temperature detection means are compared, and the operating frequency of the compressor 6 is determined depending on the magnitude of both temperatures. For example, if the temperature inside the refrigerator is less than the set temperature, the compressor 6 is stopped, if the temperature inside the refrigerator is less than the set temperature, the compressor 6 is operated at high frequency, and if the temperature inside the refrigerator is less than the set temperature, the compressor 6 is stopped. When operating at a low frequency, 3 pages etc. are determined and output from the output terminal Oo. 7
is an operation control means, such as a transistor inverter, which receives the frequency determined by the control means 6 and operates the compressor 6 at that frequency. 8 is a relay which has a contact 8' and is set to 0N10 by the output of the control means 4.
FFI: This is to turn the defrosting heater 9 on to 0N10FF.

In this configuration, when the refrigerator is first turned on, the temperature inside the refrigerator is the same as the outside temperature.
The temperature inside the refrigerator reaches the set temperature, and the control means 5 is operated by the compressor 6.
Decide to operate at high frequency. For this reason, the compressor is operated at a high frequency. FIG. 2 shows changes in the motor current of the compressor 6 at this time. That is, T
After a period of time, the motor current reaches the peak value A point, and then the motor current decreases.

Therefore, a very large current flows at point A, and elements such as transistors that can withstand this current must be used in the operation control means 7, which is expensive.

OBJECTS OF THE INVENTION Therefore, it is an object of the present invention to reduce the current peak value and to reduce the cost by reducing the capacitance of elements such as transistors used in the operation control means.

Structure of the Invention In order to achieve this object, the present invention operates a timer from the time the power is turned on, and changes the operating frequency of the compressor after a certain period of time to reduce the current peak value after the power is turned on. be.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. Third
The figure is a diagram showing the configuration of an embodiment of the present invention, in which chamber temperature detection means 1. Set temperature detection means Hole defrosting start detection means 3.
Defrosting completion detection means 4. Control means 6. Compressor 6, operation control means 7. Relay 8. Since the heater 9 has the same configuration as the conventional example, detailed explanation thereof will be omitted. 10 is a first timer that starts operating at the same time as the power is turned on, and outputs an output after a certain period of time has elapsed. This output causes the controller 6 to
7 Stage 5 decides to operate the compressor 6 at an intermediate frequency between the high frequency and the low frequency if it has been operating at high frequency until then, and sends an output to the operation control means 7 to control the operation. The means operates the compressor 6 at an intermediate frequency. Reference numeral 11 is a second timer which operates for a certain period of time after the output of the first timer 10 is received and the control means 6 determines the intermediate frequency.

The operation will be explained below with reference to FIG.

In FIG. 4, in step 1, it is detected that the power is turned on, and in step 2, the first timer 1° is sub-started. Next, in step 3, it is determined whether the first timer 1o has reached the set time, and if it is the set time, the process proceeds to step 9, and if it is not the set time, the process proceeds to step 4. In the fourth step, the temperature inside the refrigerator detected by the temperature inside the refrigerator 1 is inputted from the input terminal IO. Next, in six steps, the set temperature detected by the set temperature detection means 2 is inputted from the input terminal 11. Next, in step 6, the internal temperature input in step 4 is compared with the set temperature input in step 6, and in step 6, the operating frequency of compressor 6 is determined, and the operating frequency of compressor 6 is determined from output terminal o1. It outputs to the frequency control means 7. At this time, the frequency control means 7 operates the compressor 6 at the determined frequency. For example, if the temperature inside the refrigerator is > the set temperature, the operating frequency of the compressor 6 is set to 9
Compressor 6 at 0 Hz, internal temperature - set temperature
If the operating frequency of the compressor 5 is 30H2, and the temperature inside the refrigerator is set temperature, the operating frequency of the compressor 5 is OHz.
In this case, the compressor 6 is turned off.

Next, in step 8, the output is input to the defrosting start detection means 3 to determine whether defrosting has started.

If defrosting has not started, return to step 3 and repeat the above operation. Next, when the first timer 1o reaches the set time in 3 steps, it is determined in 9 steps whether or not the control means 6 is operating at a high frequency (90 Hz).
Proceed to step 0, and if the frequency is not high, proceed to step 4. In the 10th step, the control means 5 operates at an intermediate frequency (eoHz).
) is output to the operation control means 7, and the combination 7.
＼-/ Run 6 at intermediate frequency. Next, in step 11, the first timer 10 is cleared, but it is remembered that the first timer 10 has reached the set time.

- At step 13, it is determined whether the second timer 11 has reached the set time. 8 if it is not the set time
If it is the set time, the second timer 11 is cleared in step 14, the memory that the first timer 1o has reached the set time is reset, and the process goes to step 8. Next, when defrosting starts at step 8, the process advances to step 15, and the first timer 10. Clear the second timer 11 and set the operating frequency of the compressor 6 to 0H in 16 steps.
z (OFF) and output to the operation control means from the output terminal OO. Next, in step 17, a defrosting signal is output from the output terminal o1, the relay 8 is turned on, and the heater 9 is energized to start defrosting. Next, in step 18, the output of the defrosting end detection means 4 is inputted, and it is determined whether or not there is an output from the defrosting end detection means 4. If there is no output, the process returns to step 18 and the defrosting end detection means 4 is again inputted. Enter the output of If there is an output, the process proceeds to step 19 and the heater 9 is turned to 0FFI, thereby completing defrosting.

In this way, when the power is turned on, since the temperature inside the refrigerator is higher than the set temperature, the control means 6 decides to operate the compressor 6 at high frequency, so that the motor current increases as shown in FIG. do.

At this time, a time T that is slightly shorter than the time T required for the setting time of the first timer 10 to reach the current peak value (indicated by a broken line) (this time can be determined through experiments, etc.)
1 and set the set time of the second timer 11 to a time T2 that exceeds the peak value, it is possible to operate at an intermediate frequency and suppress the peak of the motor current. Then, by operating at the intermediate frequency for the time set by the second timer 11 and returning to the high frequency after the current peak value has been exceeded,
There is also no significant change in cooling performance. Since the time until this current peak value is reached is almost constant in one system, the set time T1 of the first timer 1o
．． The set time T29 of the second timer 11 may be determined by the system. Therefore, the peak value of the current can be reduced by setting the first timer 1o to a time T1 that is a little shorter than the time T until the current reaches its peak, and the transistors and other elements used in the operation control means 7 can be used with small capacitance. Therefore, the configuration of the operation control means 7 can be made inexpensive.

Effects of the Invention As is clear from the above explanation, the present invention controls the frequency to be changed when the compressor is operated at a high frequency by using the timer 1 which operates from power-on and sends out an output after a certain period of time. Therefore, the capacitance of elements such as transistors used in the operation control means can be made small, and the operation control means can be constructed at low cost.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of a conventional refrigerator operation control device, Fig. 2 is a current characteristic diagram showing changes in motor current after power is turned on according to the conventional control method, and Fig. 3 is a diagram showing the change in motor current after turning on the power according to the conventional control method. A block diagram of a refrigerator operation control device showing one embodiment, FIG. 4 is a flowchart of FIG. 3, and FIG. 5 is a change in motor current when using the operation control device of the present invention. FIG. 1... Inner temperature detection means, 2... Preset temperature detection means, 6... Control means, 7...
・Operation control means, 10...first timer, 11.
...Second timer.

Claims (1)

[Claims] an internal temperature detection means for detecting the temperature inside the refrigerator; a set temperature detection means for detecting the set temperature inside the refrigerator; a first timer that starts operating at the same time as the power is turned on and sends out an output after a certain period of time has elapsed; a second timer that starts its operation after the output of the first timer is sent out and sends out the output after a certain period of time has elapsed;
A control means for determining an operating frequency of the compressor based on input from a timer and the second timer, and an operation control means for operating the compressor at the operating frequency determined by the control means. A refrigerator operation control device that changes the operating frequency of the compressor after a certain period of time and controls the compressor to operate at the changed operating frequency for the certain period of time.