JPH01269869A - Operation control apparatus of air conditioner - Google Patents

Abstract

PURPOSE:To set torque in the optimum condition to operate a compressor in the range of low frequency while planning low input by changing the input voltage of the compressor in response to the load (the change of delivery pressure) of the compressor at the time of low frequency operation. CONSTITUTION:In an operating control apparatus, the numeral 11 shows a pressure detecting circuit including a pressure sensor, the numeral 12 a resistance circuit for a set pressure value, the numeral 13 a microcomputer, the numeral 14 a power transistor device, the numeral 15 a power source device including a power source, a fuse, a diode bridge and the like and the numeral 16 a three- phase compressor. When at first an operating frequency and a pressure value are read in and the comparative judgement of the operating frequency and the set frequency is performed to recognize the same frequency, the rotating speed control II (f-V characteristics II) of a compressor is selected and the power transistor device is driven in only the case where the comparative judgement of a read-in pressure value and the set pressure value is performed and the read-in pressure value is larger than the set pressure value. In the other cases, rotating speed control of the compressor I (f-V characteristics I) is selected and the power transistor device is driven.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an operation control device for an air conditioner equipped with a frequency converter.

Conventional technology In recent years, air conditioners equipped with frequency converters have a wide set frequency range to increase the variable range of cooling/heating capacity, improving the feeling during operation and saving energy during operation. .

An example of the above-mentioned conventional air conditioner equipped with a frequency converter will be described below with reference to the drawings.

FIG. 6 and FIG. 7 show a conventional refrigeration cycle diagram and an electric circuit diagram, respectively.

In Fig. 6, 101 is a compressor, 102 is a west valve, 1
03 is an indoor heat exchanger, 104 is a pressure reducing device, and 105 is an outdoor heat exchanger.

In FIG. 7, 106 is a power supply device including a noise filter, a diode bridge, etc., 107 is a power transistor device, and 108 is a microcomputer.

The operation of the air conditioner equipped with a frequency converter having the above configuration will be described below.

First, the power transistor device 107 generates a three-phase waveform from unequal width pulses output from the microcomputer 108, and the three-phase compressor 101 is driven. Further, the frequency-voltage characteristics shown in FIG. 5 are set and operated based on the pulse width and period output from the microcomputer 108.

Problems to be Solved by the Invention However, the above configuration has a problem in that the compressor 101 is overloaded and it is difficult to pursue low-performance input during cooling and heating.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention aims to provide an improved feeling during operation and energy savings by pursuing a variable range of power input during heating and cooling, especially low power input.

Means for Solving the Problems In order to solve the above problems, the air conditioner operation control device of the present invention includes a pressure detection means for detecting the discharge pressure of the compressor, and a voltage value and a set pressure value of the pressure detection means. a comparison means for comparing and determining voltage values of and outputting an H-L control signal; and a determining means for determining whether the operating frequency of the compressor and a set frequency are the same value and outputting an H-L control signal. , a calculation means for performing a combination calculation of the control signal of the comparison means and the control signal of the determination means; and H-L output from the calculation means.
According to the control signal, either one of the compressor rotational speed controls 1 and 1 built in the storage means is selected, and output means is provided for operating the compressor according to the selected compressor rotational speed control. It is.

Effect: With the above-described configuration, the present invention allows the compressor to be operated at a specified low frequency and to change the compressor rotational speed control in response to changes in load (changes in discharge pressure). The width can be increased, and low-performance input values during cooling and heating, which could not be achieved with conventional air conditioners equipped with frequency converters, can be achieved.

Embodiment Hereinafter, an embodiment of the operation control device for an air conditioner equipped with a frequency converter according to the present invention will be described with reference to the drawings.

FIG. 1 shows a circuit diagram of an operation control device for an air conditioner equipped with a frequency converter according to an embodiment of the present invention.

In FIG. 1, 11 is a pressure detection circuit including a pressure sensor, 12 is a resistance circuit for setting pressure value, 13 is a microcomputer (hereinafter referred to as LSI), 14 is a power transistor device, 15 is a power supply, a fuse, a noise filter, A power supply device includes a diode bridge, etc., and 16 is a three-phase compressor.

The operation of the operation control device for an air conditioner equipped with a frequency converter configured as described above will be described below with reference to FIGS. 1 to 4.

FIG. 2 is a block diagram representing the control device using function realizing means, and the relationship with each component shown in FIG. 1 is shown below.

The pressure detection circuit 11 shown in FIG. 1 corresponds to the pressure detection means, and the set pressure value resistance circuit 12 corresponds to the set pressure value. Also,
The comparison circuit built into LS113 serves as comparison means,
A determination circuit built in S113 serves as a determination means.
The arithmetic circuit built in 113 serves as the arithmetic means, and LS1
A storage circuit that stores compressor rotation speed control I, 1 (frequency-voltage characteristics r, II) built in 13 corresponds to the storage means. Furthermore, the power supply device 15 and the power transistor device 14 correspond to output means.

FIG. 3 is a flowchart of the operation control device showing its operation. First, read the operating frequency and pressure value, compare and judge the operating frequency and set frequency, and if they are the same frequency, compare and judge the read pressure value and set pressure value,
Compressor rotation speed control 1 only when the pressure is higher than the set pressure value
(f-V characteristic II) and drive the power transistor device. In other cases, compressor speed control I
(The f-VTh characteristic is selected and the power transistor device is driven.

As described above, according to this embodiment, in an air conditioner equipped with a frequency converter, torque can be increased by changing the input voltage of the compressor in response to the compressor load, that is, the discharge pressure, during low frequency operation. Since it can be set optimally, it is possible to operate in a low frequency range, and furthermore, it is possible to reduce input power, and it is possible to improve the feeling when driving.

Effects of the Invention As described above, the present invention enables an air conditioner to optimally set the torque by changing the input voltage of the compressor in response to the compressor load (discharge pressure change) during low frequency operation. Therefore, it is possible to operate in a low frequency range, and furthermore, it is possible to reduce the input input, and it is possible to improve the feeling during driving.

[Brief explanation of the drawing]

Fig. 1 is an electrical circuit diagram of an operation control device for an air conditioner equipped with a frequency converter according to an embodiment of the present invention, Fig. 2 is a block diagram expressing the operation control device as a function realizing means, and Fig. 3 is 4 is a frequency-voltage characteristic diagram of the same control device, FIG. 5 is a frequency-voltage characteristic diagram of a conventional air conditioner equipped with a frequency converter, and FIG. 6 is a refrigeration cycle diagram. FIG. 7 is a conventional electrical circuit diagram. 11...Pressure detection circuit, 12...Resistance circuit for set pressure value, 13...Microcomputer, 14...Power transistor device, 15.
...Power supply device, 16...Three-phase compressor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 4 Figure 5 Figure 10 No Three-phase pressure aa 105- Violet stool 1 Jiao Jiao cup Figure 6/

Claims (1)

[Claims] A refrigeration cycle is constructed in which a compressor, a four-way valve, an indoor heat exchanger, a pressure reducing device, and an outdoor heat exchanger are connected in a ring, and the pressure detection means detects the discharge pressure of the compressor; Compare and judge the voltage value and the voltage value of the set pressure value, and
・A comparison means for outputting an L control signal; a determination means for determining whether the operating frequency of the compressor is the same as a set frequency and outputting an H/L control signal; and a comparison means for outputting an H/L control signal; A calculation means for calculating a combination of the control signals of the determination means, and a compressor rotation speed control I built in the storage means according to the H and L control signals output from the calculation means.
, II is selected, and output means for operating the compressor according to the selected compressor rotation speed control.