JPH0533986A - Current controller for power source - Google Patents

Abstract

PURPOSE:To obtain a current controller which can control to operate a plurality of air conditioners in response to a total current. CONSTITUTION:The current controller for a power source comprises current detecting means 6 provided in a power source circuit, priority order setting means 14 for operating an upper limit value of a total current in response to a capacity of a breaker 2 and setting a total current priority order, ambient temperature detecting means 13 for detecting the ambient temperature of the breaker 2, operating frequency correcting means 17 for correcting an operating frequency of a compressor 7, and an output circuit 19 for controlling an air conditioner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to a power supply current controller.

[0002]

2. Description of the Related Art In recent years, with the increase in size and multifunction of home electric appliances, the demand for electric power in the home tends to increase, and the possibility that the breaker will operate increases. On the other hand, due to the progress of multi-functionality, the number of products that have a memory function and a clock function inside has increased, and some of them have the built-in functions cleared once the power is turned off. There was not much to operate the breaker.

FIG. 4 is a plan view showing a conventional power supply current control device disclosed in, for example, Japanese Utility Model Laid-Open No. 61-114242, in which 1 is a power supply circuit, 2 is a breaker, 3 is an air conditioner main body, 4 and 5 are electrical products that are other loads, 6
Is a sensor that detects a total current that combines the loads of the air conditioner body 3 and the other electric products 4 and 5, and 7 is a current consumption of the air conditioner 3 that is consumed by the variable capacity compressor 8, the fan 9, and the like. An air conditioning current sensor for detection, 10 is means for changing the upper limit set current value, and 11 is a rotation speed control means.

Next, the operation will be described. Air conditioning current sensor 7
Detects the current flowing through the air conditioner. The total current value obtained by adding the detected current consumption of the air conditioner and the current consumption of the other electric appliances 4, 5 is detected by the total current detection sensor 6,
The rotation speed of the compressor was determined by the rotation speed control means 11 by performing a comparison calculation with the upper limit set current value. Further, when the current value of each of the above electric appliances becomes larger than the current value detected by the total current detection sensor 6, the breaker 2 operates and the power supply circuit 1
Was shut off and the power supply was stopped.

[0005]

Since the conventional power supply current control device is constructed as described above, there is no need to deal with the situation where a large number of air conditioners are installed in one place. Was not considered. Further, it has not been considered at all that the operating current of the breaker is slightly different depending on the ambient temperature of the breaker.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a power supply current control device capable of controlling the operation of a plurality of air conditioners according to the total current. To do.

Another object of the present invention is to obtain a power supply current control device that can be operated with a current as large as possible by shifting the point at which the current control is performed depending on the ambient temperature of the breaker.

[0008]

A power supply current apparatus according to the present invention is provided with a current detection means provided in a power supply circuit and provided with a total current sensor, and is operated at an upper limit value of the total current according to the capacity of a breaker. Priority setting means for setting the current priority, ambient temperature detection means for detecting the ambient temperature of the breaker, and a compressor which receives signals from the current detection means and the ambient temperature detection means as input and operates according to the priority setting means. The operating frequency correcting means for correcting the operating frequency and the signal output circuit for controlling the air conditioner by the output signal of the operating frequency correcting means are provided.

[0009]

When the total current is about to exceed the set value, the power supply current device according to the present invention controls the air conditioner with the set priority so that the breaker does not operate.
Further, when the ambient temperature of the breaker is high, the limit value of the total current is corrected to a lower value, and when the ambient temperature is low, it is corrected to a higher value, so that the breaker can be used just before the operating point.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 12 indicates an ambient temperature detecting means 13 for detecting the ambient temperature of the breaker 2 and an operation signal of an upper limit value of the total current according to the capacity of the breaker 2 to set the total current priority order of a plurality of devices. Priority setting means 14
A power source current control means including a microcomputer 1
5 are connected to the input circuit 16. Reference numeral 17 denotes an operating frequency correcting means for receiving the detection signals from the current detecting means 6 and the ambient temperature detecting means 13 and calculating and correcting the operating frequency of the compressor 7 having the priority set by the priority setting means 14 by the CPU 19. , And is connected to a signal output circuit 19 which outputs the corrected signal to the air conditioner.

The operation of this embodiment will be described below with reference to the flow chart shown in FIG. Start, Step 1
In A, the upper limit value of the total current according to the capacity of the breaker 2 by the setting switch which is the priority setting means; A1, the number of the air conditioner to be operated; n, or the priority of each air conditioner once Drop it under the control of. For example, the control change amount such as the compressor operating frequency; f ₁ is read and input. Next, in step 2, the breaker temperature is input; t, and t ₁ , t ₂ , a ₁ , a ₂ ; the constants according to the breaker characteristics, the detected temperature and the reference temperature detected by the ambient temperature detecting means in step 3 are set. In comparison, when the breaker ambient temperature is high, that is, when t ₂ <t, the operating current of the breaker decreases, so in step 4, a ₂ is subtracted from the upper limit value of the total current, and conversely, when the breaker ambient temperature is low,
That is, since the operating current of the breaker rises when t ₁ > t, in step 5, a ₁ is added from the upper limit value of the total current. Next, in step 6, the current value is detected by the current detecting means 6, and if it is larger than A ₁ + a ₂ or A ₁ −a ₁ , the process proceeds from step 7 to step 8 to operate the compressor of the air conditioner having a low priority. Drop the frequency by f ₁ . Further, when the total current further exceeds, the compressor operating frequency of the air conditioner with the next lowest priority is reduced by f ₁ . On the contrary, if the total current is smaller than A ₁ + a ₂ or A ₁ −a ₁ and there is an air conditioner that controls to reduce the compressor operating frequency, proceed from step 10 to step 11.
The control is released in descending order of priority.

In the above embodiment, the compressor operating frequency is changed as the control content, but the compressor is turned on / off.
The same effect can be obtained with the control to be performed. Therefore, it is obvious that an air conditioner using a variable capacity compressor can also be used in the present invention.

[0013]

As described above, according to the present invention, the current detection means provided with the total current sensor provided in the power supply circuit and the operation of the total current upper limit value according to the capacity of the breaker are performed, and the total current priority is given. Priority setting means for setting the order, ambient temperature detection means for detecting the ambient temperature of the breaker, and operation of the compressor which receives signals from the current detection means and the ambient temperature detection means and operates according to the priority setting means Since the operation frequency correction means for correcting the frequency and the signal output circuit for outputting the output signal of the operation frequency correction means to the air conditioner are provided, the apparatus can be made inexpensive and the control of each air conditioner can be executed in association with each other. At the same time, there is the effect that the margin with the breaker operating current can be reduced and operation can be performed with a large input current.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a control block diagram of the present invention.

FIG. 3 is a flowchart of an embodiment of the present invention.

FIG. 4 is a schematic block diagram showing a conventional power supply current control device.

[Explanation of symbols]

 6 Current Detection Means 7 Compressor 13 Ambient Temperature Detection Means 14 Priority Setting Means 17 Operating Frequency Correction Means 19 Output Circuits

Claims (1)

Claim: What is claimed is: 1. A power supply circuit comprising a plurality of air conditioners connected to each other, and a power supply current control device for controlling a current of the power supply circuit, the current detection comprising a total current sensor provided in an upper power supply circuit. Means, operating a total current upper limit value according to the capacity of the breaker, priority setting means for setting the total current priority, ambient temperature detection means for detecting the ambient temperature of the breaker, the current detection means and Operating frequency correction means for correcting the operating frequency of the compressor operating in accordance with the priority setting means by inputting a signal from the ambient temperature detecting means, and a signal output for controlling each air conditioner by the output signal of this operating frequency correction means A power supply current control device comprising a circuit.