JPH09273798A - Controller for power supply electric current of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable control of operating frequency of a compressor without exceeding the set value of upper limit of a total current by a method wherein a current control means, determining the deteriorating width of operating frequency of the compressor in accordance with a difference between a room temperature and a set temperature as well as the using rate of current when a total current has exceeded the set value, and a means, compensating the operating frequency of the compressor by a command from the current control means, are provided. SOLUTION: When a total current B is detected by a total current sensor (ST2), the total current B is compared with the set value of upper limit of total current A (ST3) and the result of judgement is outputted to a current control means. The current control means reads the values of current of respective air conditioners, an indoor temperature and a set temperature to determine the deteriorating width of operating frequency of the compressor in accordance with a rule related to a comfortable degree and a current using rate (ST4), then, outputs the determined value to the compensating means of respective air conditioners (ST5). Next, the total current B is detected with a predetermined sampling period (ST6) to check whether the total current B is lower than a given rate of the capacity of a breaker or not (ST7). When it is not lower than the given rate, the operation is returned to the step ST4, however, when it is lower than the given rate, the lowering command of number of rotation to the compensating means is released.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a power supply current controller for an air conditioner.

[0002]

2. Description of the Related Art In recent years, a plurality of air conditioners are often installed in general households, shops, etc., and the demand for electric power is gradually increasing with the increase in size and multifunction of other home appliances. There is a tendency for the breaker to operate, which is increasing.

Further, as air conditioners and home electric appliances have become multi-functional, more and more electric appliances have a memory function and a clock function, and once the power is turned off, Appropriate operation even if the data already acquired is cleared and the breaker is restored to its original state.
There is a problem that it takes time to return to operation, and it is not preferable to operate the breaker.

Therefore, in order to improve the above problems, a power supply current control device as disclosed in Japanese Patent Laid-Open No. 5-33986 has been proposed. As shown in FIG. 5, this power supply current control device includes a current detection means 101 for detecting a total current due to a load of an air conditioner or other electric equipment, an ambient temperature detection means 102 for detecting an ambient temperature of a breaker, and a breaker. An input circuit 10 and a priority setting means 103 for setting a total current upper limit set value determined according to the capacity and a priority for controlling a plurality of air conditioners and other electric devices.
4. A CPU 105 for executing predetermined arithmetic control and a current control device 107 having an output circuit 106 are provided, and when the total current detected by the current detection means 101 exceeds the total current upper limit set value, the CPU 105 The air conditioner compressors 108 are sequentially selected according to the priority order set by the priority order setting means 103, and the air conditioner compressors 108 are selected.
And outputs it to the operating frequency correcting means 109. Here, the operating frequency correction unit 109 is the CPU 1
The correction signal is obtained based on the operating frequency obtained in step 05, and the compressor 108 is controlled via the output circuit 106.

[0005]

Therefore, when the total current exceeds the preset total current upper limit setting value, the power supply current control device as described above has a priority order of the air conditioners according to the preset priority order. Since the compressor operating frequency will be reduced, the temperature difference between the set temperature and room temperature will always be large in the room where the air conditioner with a high priority is installed, despite being uncomfortable. There is a problem of lowering the compressor operating frequency. That is, the conventional power supply current control device does not consider the comfort level of the room in which each air conditioner is installed.

The invention set forth in claim 1 has been made in view of the above circumstances, and provides a power supply current control device for an air conditioner that realizes comfort in the room where each air conditioner is installed. is there. The invention described in claim 2 is to provide a power supply current control device for an air conditioner that determines an optimum control width of a compressor operating frequency.

[0007]

In order to solve the above problems, the invention according to claim 1 is directed to a power supply circuit to which a plurality of air conditioners are connected and a deviation between a room temperature and a set temperature. Each of the air conditioners that controls the compressor operating frequency, a total current sensor that detects the total current of the power supply circuit, and a determination that determines whether the total current detected by the total current sensor exceeds a set value And a current for determining a reduction width of the compressor operating frequency of each air conditioner in accordance with the deviation between the room temperature and the set temperature in each of the air conditioners and the current usage rate when the total current exceeds the set value. The power supply current control device for an air conditioner is provided with a control means and a correction means for correcting each compressor operating frequency according to a command from the current control means.

In the invention corresponding to claim 1, by taking the above-mentioned means, it is judged by the judging means whether the total current exceeds the preset value, and the total current exceeds the set value. When it exceeds, it determines the decrease width of the compressor operating frequency of each air conditioner according to the deviation between the room temperature and the set temperature in each air conditioner and the current usage rate, and corrects the compressor operating frequency. The compressor operating frequency of each air conditioner will be corrected in consideration of the deviation from the set temperature and the current usage rate, and it is possible to realize operation control with due consideration of indoor comfort.

Next, in the invention according to claim 2, as the current control means, from the magnitude of the deviation between the room temperature and the set temperature, and the magnitude of the current used by each air conditioner with respect to the total current value, A grade value is obtained according to a preset rule, and a decrease width of the compressor operating frequency is determined based on this grade value.

The invention according to claim 2 is premised on the magnitude of the deviation between the room temperature and the set temperature and the magnitude of the used current ratio to the total current value, and according to the grade value determined by a preset rule. Since the reduction width of the compressor operating frequency is determined, the determined reduction width of the compressor operating frequency is an optimum value, and comfortable air conditioning control that is friendly to the living environment can be realized.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of a power supply current control device for an air conditioner according to the present invention.

In the figure, reference numeral 1 is a breaker installed in a building lead-in portion of a power supply line (power supply circuit), 2 to 4
Is an air conditioner that is connected to a power supply line and is installed in each room of the building, 5 is an electric device other than the air conditioner, such as a hair dryer, a microwave oven, and 6 is an air conditioner 2
4 and electric equipment 5 other than the air conditioner, that is, a total current sensor for detecting the total current of all loads, 7 is an air conditioner 2-4 based on the total current detected by the total current sensor 6.
2 is a current control device that determines the compressor operating frequency.

Each of the air conditioners 2 to 4 and the current control device 7 is constructed, for example, as shown in FIG. Since each of the air conditioners 2 to 4 has substantially the same configuration as a main part of the present invention, only the configuration of the air conditioner 2 will be described here, and the other air conditioners 3 will be described. , 4 will be omitted.

The air conditioner 2 has a current sensor 21 for detecting the current consumption of its own air conditioner 2, a room temperature sensor 22 for detecting the room temperature in which the air conditioner 2 is installed, and an indoor temperature as a target temperature. The temperature setting unit 23 that sets the operating temperature of the compressor 24 according to the deviation between the room temperature detected by the room temperature sensor 22 and the set temperature set by the temperature setting unit 23. It is composed of a correction unit 26 for correcting the compressor operating frequency, an output unit 27 for outputting a signal of the correction result and controlling the rotation speed of the compressor 24, and the like.

Reference numerals 31 and 41 are current sensors, and 32 and 4
2 is a room temperature sensor, 33 and 43 are temperature setting sections, and 34 and 44
Is a compressor, 35 and 45 are control means, 36 and 46 are correction means, and 37 and 47 are output means.

The current controller 7 includes a total current setting unit 71 for setting a total current upper limit set value determined according to the capacity of the breaker 1, and a total current detected by the total current sensor 6 and a total current setting unit. The total current upper limit setting value of No. 71 is compared to determine whether the total current exceeds the total current upper limit setting value, and the total current is set to the total current upper limit setting based on the determination result of this determination unit 72. When the value is exceeded, each air conditioner 2
4 to 4 are determined by using the deviation between the installed room temperature and the set temperature, and the current usage rate obtained from each current sensor 21, 31, 41. Then, the correction means 26, 36, 4 in each air conditioner 2-4
6 is provided. The correction means 26, 36, 46 of each of the air conditioners 2 to 4 have a function of correcting the compressor operating frequency based on the instruction content from the current control means 73.

Next, the operation of the embodiment configured as described above will be described with reference to FIG. When the operation of the device starts, the total current upper limit setting value A corresponding to the capacity of the breaker 1 is set in the total current setting unit 71 (ST1). In addition, in the temperature setting parts 23, 33, 43 of the air conditioners 2 to 4,
The optimum target temperature is set in consideration of the living environment in the room where each of the air conditioners 2 to 4 is installed, but the target temperature can be changed at any time if necessary.

After setting the necessary set values as described above, the control means 25 of the air conditioner 2, for example, the deviation between the room temperature detected by the room temperature sensor 22 and the set temperature set by the temperature setting section 23. The operating frequency of its own compressor 24 is controlled in accordance with the above.

On the other hand, in the current control device 7, when the total current sensor 6 detects the total current B (ST2), the discriminating means 72 causes the total current B detected by the total current sensor 6 and the total current upper limit set value A. (ST3) and when it is determined that the total current B exceeds the total current upper limit set value A, the determination result is sent to the current control means 73.

This current control means 73 is provided for each air conditioner 2-4.
Current values of the current sensors 21, 31, 41, the room temperature of each room temperature sensor 22, 32, 42, the temperature setting unit 23,
After taking in the set temperatures of 33 and 43, the compressor operating frequency (rotational speed) of each air conditioner 2 to 4 is followed according to the rule map that defines the grade value from the relationship between the comfort level and the current usage rate shown in FIG. The width of decrease is determined (ST4). Here, the comfort level defined in the rule map is the comfort level classified into classes according to the temperature difference between the set temperature of the temperature setting unit in each of the air conditioners 2 to 4 and the room temperature detected by the room temperature sensor. For example, PB: very large (very uncomfortable),
PS: Large (uncomfortable), ZO: Almost no (comfortable). Regarding the current usage rate, each current sensor 21, 31, 4 with respect to the total current value
It is divided into classes according to the ratio of the current value of 1. The ratio is classified into three stages of PB: very large, PS: slightly large, and ZO: small. The grade value determines the degree to which the operating current is desired to be suppressed, that is, the width of decrease in the compressor rotation speed. For example, "5" is very large, "4" is quite large, "3" is slightly large, " It is determined that "2" is small and "1" is hardly suppressed, and the decrease width of the compressor operating frequency (rotation speed) is determined based on this grade value.

When the current control means 73 determines the reduction width of each compressor operating frequency in this manner, the determined reduction width of the compressor operating frequency is corrected by the correction means 2 of each air conditioner.
It is sent to 6, 36 and 46 (ST5). Here, if the correction means 26, 36, 46 corrects the compressor rotation speed based on the reduction width of the compressor operating frequency sent from the current control means 73, the capacity of the air conditioner decreases and the current value becomes descend.

Therefore, the total current B is detected every predetermined sampling period (ST6), and the detected total current B is detected.
Is a constant ratio k of the breaker capacity (total current upper limit set value A)
It is checked whether (0 <k <1) or less (ST7). If not, step ST
4, the same process is repeated, and when the breaker capacity (total current upper limit set value A) is below a certain ratio, the current controller 7 causes the correction means 26, 36 of each of the air conditioners 2-4. , 46, the command for lowering the rotation speed is released (ST8).

Then, returning to step ST2, the total current B is compared with the total current upper limit set value A determined according to the breaker capacity in the same manner as described above (ST3), and the total current B exceeds the total current upper limit set value A. When this happens, the processes after step ST4 are repeated.

Therefore, according to the configuration of the above embodiment, when the total current exceeds the total current upper limit set value A, the decrease in capacity is small in the place where the room temperature is far from the set temperature, and the room temperature is large. By controlling the current drop to be close to the set temperature, the control is performed so that all rooms are comfortable.

[0025]

As described above, according to the present invention, the following various effects are exhibited. In the invention of claim 1, when the total current detected by the total current sensor provided in the power supply line exceeds the total current upper limit set value determined by the breaker capacity, the deviation between the room temperature and the set temperature in each air conditioner and The reduction range of the compressor operating frequency of each air conditioner is determined according to the current usage rate and the compressor operating frequency is corrected, so the total current upper limit set value, which is the range where the breaker does not operate, is not exceeded. It is possible to control the compressor operating frequency of each air conditioner while considering the comfort level.

According to the second aspect of the present invention, the compressor is operated in accordance with a preset grade value based on the magnitude of the deviation (comfort) between the room temperature and the set temperature and the magnitude of the used current ratio to the total current value. Since the frequency decrease width is determined, the compressor operating frequency can be controlled while maintaining a comfortable state in any room.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a power supply current control device for an air conditioner according to the present invention.

FIG. 2 is a diagram showing a main configuration of each air conditioner and current control device shown in FIG.

FIG. 3 is a flowchart illustrating the operation of the device of the present invention.

FIG. 4 is a diagram showing a rule map for determining a range of decrease in compressor operating frequency.

FIG. 5 is a schematic block diagram showing a conventional power supply current control device.

[Explanation of symbols]

2 to 4 ... Air conditioner, 5 ... Electric equipment other than the air conditioner,
6 ... Total current sensor, 7 ... Current control device, 26, 36, 4
6 ... Correction means, 71 ... Total current setting section, 72 ... Judgment means,
73 ... Current control means.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Shigeharu Arima 2-47 Shiobara, Minami-ku, Fukuoka-shi, Fukuoka Inside Kyushu Electric Power Co., Inc. Research Institute (72) Inventor Seigo Umeda Shiobara, Minami-ku, Fukuoka-shi, Fukuoka 2-chome 1-47 Kyushu Electric Power Co., Inc. Research Institute (72) Inventor Makiko Suzuki Highway No. 1, Takamichi, Iwatsuka-cho, Nakamura-ku, Nagoya-shi, Aichi Mitsubishi Heavy Industries, Ltd. Nagoya Research Institute (72) Inventor Fuji ▲ ▼ Tadashi, Takachi, Iwazuka-cho, Nakamura-ku, Nagoya, Aichi Prefecture, Nagoya Research Institute, Mitsubishi Heavy Industries, Ltd. (72) Inventor, Katsuji Yamagami, 3-chome, Asahi-cho, Nishibiwajima-cho, Nishikasugai-gun, Aichi Mitsubishi Heavy Industries, Ltd.

Claims (2)

[Claims] 1. A power supply circuit to which a plurality of air conditioners are connected, each of the air conditioners for controlling a compressor operating frequency in accordance with a deviation between a room temperature and a set temperature, and a total current of the power supply circuit. A total current sensor for detecting, a determination means for determining whether or not the total current detected by the total current sensor exceeds a set value, and a room temperature in each of the air conditioners when the total current exceeds the set value Of the compressor operating frequency of each air conditioner in accordance with the deviation between the temperature and the set temperature and the current usage rate, and a correction for correcting each compressor operating frequency by a command from the current controlling means. A power supply current control device for an air conditioner, comprising: 2. The current control means obtains a grade value according to a preset rule from the magnitude of the deviation between the room temperature and the set temperature and the magnitude of the ratio of the current used by each air conditioner to the total current. The power supply current control device for an air conditioner according to claim 1, wherein the power supply current control device has a function of determining a reduction width of the compressor operating frequency based on the grade value.