JPS58156143A - Electric current controller of air conditioner - Google Patents

Abstract

PURPOSE:To correct the change of conditions of load due to the difference of frequency of the power source used so as to perform efficient operation, by providing a plurality of set values of electric current in accordance with the frequency of the power source, and changing the set values in accordance with the frequency of the power source used. CONSTITUTION:In an interior fan motor 1, an auxiliary heater 2, an exterior fan motor 3 and a compressor 4, the total electric current is detected by an electric current transformer CT 5, it is converted to a voltage V1 by a current-voltage converting circuit 7, then it is compared in a comparator 8 with a reference voltage VREF from a microcomputer 6, and by the output from the comparator 8 the microcomputer 6 controls via relays 9, 10, the auxiliary heater 2, the exterior fan motor 3 and the compressor 4. By a change-over switch 11, a plurality of set values of electric current according to the frequency of the power source are changed to set values according to the frequency of the power source used.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement of a current control device for an air conditioner, which corrects fluctuations in load conditions due to differences in power supply frequency and achieves more ideal current control. One of the objectives is to make it possible to

Conventional configurations and their problems Conventionally, control devices that distinguish the commercial power supply frequency and switch the control contents have been used to modify timer functions, control the speed of electric motors, etc. There was nothing that I tried to do.

On the other hand, the main load of the current control device, for example, in the case of an air conditioner, is a compressor.
The relationship is different from the case of 60 cities. Generally, if the current flow of compressors with the same refrigeration cycle is the same, the discharge pressure will be higher at 50 Hz than at 60 Hz.

Therefore, in refrigeration cycles using the same compressor, the upper limit of the current and the upper limit of the discharge pressure value by the power breaker are regulated to ensure the function and performance of the compressor. Therefore, when the power supply frequency fluctuates, at 60 Hz, the current capacity of the power supply breaker is severely limiting, and at 60 Hz, the discharge pressure is severely limited.

One way to solve this problem is 50)h, 60)
If the current setting is the same regardless of h, the compressor will be stopped when there is sufficient power supply capacity at 6 ol due to the pressure limit at 50 m, and the power frequency will be 601 m.
In the -lx area, there are problems such as the compressor suddenly stopping during heating operation during high loads in spring and autumn, resulting in a situation where heating capacity cannot be secured.

OBJECT OF THE INVENTION The current control device for an air conditioner of the present invention solves the above-mentioned conventional problems, and even if power supplies with different frequencies are used, it is possible to correct fluctuations in load conditions due to the difference in frequency. , it is possible to obtain more ideal current control.

Structure of the Invention The current control device for an air conditioner of the present invention includes a current detector that detects the current of an operating device, and a control that controls energization to the operating device when the detected current value of the current detector reaches a set value. A device comprising a device, provided with a plurality of current setting values for the operating equipment in the control device according to the frequency of the power source used, and a switching means for switching the current setting value of the control device according to the frequency of the power source used. Therefore, even if the frequency of the power source used differs, efficient operation can always be performed.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

First, the outline of the air conditioner will be explained with reference to FIG.

In the figure, 1 is the indoor fan motor, 2 is the auxiliary heater, 3 is the outdoor fan motor, 4 is the compression and indoor unmotor 3, and the compressor 4 is controlled by CT Yug when its total current value exceeds the set value. via relay 9.10.

Next, an electronic circuit diagram of a control section that controls the operation of the air conditioner will be explained with reference to FIG. Components that are the same as those in FIG. 1 are given the same numbers and their explanations will be omitted.

In the figure, 6 indicates a P-channel microcomputer. 0o-03 indicates the output port of the microcomputer 6, and Io, I,
Indicates the input port of 7 is a current-voltage conversion circuit that converts the current output from CTIg into a voltage, and its output voltage is represented by Vl, which is the sum of the current ICT flowing through CT, t and the output voltage Vf of the current-voltage conversion circuit 7. The correlation is almost proportional as shown in FIG. 8 is a comparator that compares the output voltage v1 and the reference voltage vREF. This reference voltage vREF is repeatedly given potentials at four points as shown in FIG. Q1 gives a signal of 50H2. A control signal for the relay 9 for the auxiliary heater 2 is output from the output port 02, and a control signal for the relay 10 for the compressor 4 is output from the output port o3. 11 is a switch for switching between 5ol-lx and 60)h, which is switched according to the power supply frequency.

In the above configuration, when the switch 11 is operated, two modes are selected as shown in FIG.
As shown in the figure, the detection current lC at 607 o'clock and 601 o'clock
T provides the operating mode of the auxiliary heater 2 and compressor 4 controlled by the microcomputer 6. Here, the solid line portion represents the time of 6ol, and the broken line portion represents the time of 6ol.

To briefly explain the operation during heating operation at 60 Hz, when the detected current IcT by CT, F reaches the operating setting value from the state where both the auxiliary heater 2 and compressor 4 are energized,
Only the auxiliary heater 2 is turned off. When the current "CT" further increases and exceeds the operating set value continuously for a period of tl, the compressor 4 also stops. This is done after t2.Also, heater 2 is turned off.
When the compressor 4 is operated at
When the auxiliary heater 2 falls below the reset setting, the auxiliary heater 2 is reenergized.

The above is an outline of the operation.Next, when the switch 11 for switching between 50Hz and 60Hz is switched from 60)h to 50H2, the current "CT" detected by the above CT and i is as shown by the broken line, and the set value is slightly changed. Transferred and corrected.

That is, in this 50 Hz state, the same type of control will be performed by the microcomputer 6 only by correcting the set value.

Therefore, it is possible to correct the difference in the relationship between compressor current and discharge pressure when the power supply frequency is 50Hz or 60H.
z Sufficient heating capacity can be secured in any area. Moreover, the configuration can be handled by adding only a small number of components to the electronic circuit.

Here, input switching between the power supply frequency of 50 Hz and 60 Hz can be done by calculating the reference oscillation frequency of the microcomputer 6 and the 50 Hz or 60 Hz input for the reference of the timer function, without using the external switching switch 11. It can also be determined by

Furthermore, the current setting value of the compressor 4 may be changed without changing the current setting value of the heater 2 in accordance with the switching of the power supply frequency, or both may be changed to an optimum value.

In this embodiment, the microcomputer 6 is used to detect fluctuations in the power supply frequency and change the current setting value based on the detected fluctuations; however, the present invention is not limited to this. can be implemented in the same way.

Effects of the Invention As is clear from the above embodiments, the current control device for an air conditioner according to the present invention switches the set current value of the operating equipment depending on the power supply frequency used. Compared to conventional systems, this system has various advantages, such as being able to always maximize the performance of operating equipment and providing efficient air conditioning.

[Brief explanation of the drawing]

FIG. 1 is a schematic electrical circuit diagram of an air conditioner equipped with a current control device according to an embodiment of the present invention, FIG. 2 is a schematic electrical circuit diagram of the same current control device, and FIG. , an output voltage-current characteristic diagram of the voltage conversion circuit, Fig. 4 is an explanatory diagram showing changes in the reference voltage of the comparator in the same current control device, and Fig. 5 shows the operating equipment of the same current control device at different power supply frequencies. It is an explanatory diagram showing an operating state. 1...Indoor fan motor, 2...Auxiliary heater, 3...Outdoor fan motor, 4...
...Compressor, 6...CT (current detector),
6...Microcomputer (control device). Name of agent: Patent attorney Toshio Nakao and 1 other person21 Figure 3 Figure 4

Claims (1)

[Claims] The control device includes a current detector that detects the current of the operating equipment, and a control device that controls energization to the operating equipment when the detected current value of the current detector reaches a set value. A current control device for an air conditioner, comprising a plurality of current setting values for operating equipment, and a switching means for switching the current setting value of the control device according to the frequency and wave number of a power source to be used.