JP2003106607A - Control device for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for an air conditioner capable of performing an interruption processing for controlling the driving of a compressor, and an interruption processing for controlling a converter, and stabilizing the DC voltage fed to the compressor to prevent the variation of the rotational frequency of the compressor. SOLUTION: The interruption processing 12 for controlling the converter is executed with higher priority in comparison with the interruption processing 11 for controlling the driving of the compressor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an air conditioner.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIG. 2 and FIGS.

Conventionally, the compressor drive control of the air conditioner by the microcomputer has been processed with the highest priority by using the interrupt function of the microcomputer, except for the protection control.

This is due to the widespread use of DC sensorless motors as compressor motors. Since the induced voltage that can be observed only for a very short period is used as a method for detecting the rotational position of the motor, which is important when starting and operating the compressor motor, it is necessary to increase the processing speed of drive control, and the processing is given the highest priority. Was there.

Therefore, when controlling the converter that increases / decreases the DC voltage supplied to the compressor by using the interrupt function of the microcomputer as in the compressor drive control, the interrupt process to be preferentially processed in the compressor drive control. Was incorporated.

Therefore, as shown in FIG. 2, steps 10a to 10 of the flowchart 10 showing the normal processing of the air conditioner.
When the compressor drive control interrupt request and the converter control interrupt request are simultaneously generated while executing d, the normal processing 10a to 10d of the air conditioner is interrupted as shown in FIG. After the compressor drive control 11 that executes the machine drive control interrupt processing 11a and 11b (see FIG. 2B), the converter control that executes the converter control interrupt processing 12a and 12b (see FIG. 2C). Was running twelve.

For example, the step of the process 10a according to the normal process is the frequency calculation, the process 10b is the fan motor control,
The process 10c is control of the expansion valve, and the process 10d is communication with the indoor unit. Also, the interrupt processing 11a, 11b
Is the output processing of the signal that controls the drive of the compressor,
The processing for controlling the signal for controlling the drive of the compressor, and the interrupt processing 12a and 12b are the processing for outputting the signal for controlling the converter and the processing for controlling the signal for controlling the converter, respectively.

Compressor drive control 11 and converter control 12
After that, the processes 10a to 10d of the flowchart 10 (see FIG. 2A) showing the normal process of the suspended air conditioner are performed.
The control is executed so as to restart the.

Further, as shown in FIG. 7, when an interrupt request of the compressor drive control 11 is generated while interrupt control is being executed and the converter control 12 is being executed, the converter control 12 is interrupted and the compressor is driven by an interrupt. After executing the control 11, the interrupt processing of the interrupted converter control 12 is executed to output a signal for converter control.

Therefore, as shown in FIG. 8, when a compressor drive control interrupt request is made at the time of the converter control signal, the converter control signal is originally output from the output start time X for a predetermined time Y. , Was output at the time Xa delayed by the time Z required to execute the processing of the compressor drive control.

[0011]

However, in the control as described above, the interrupt processing of the compressor drive control 11 is executed prior to the interrupt processing of the converter control 12, so that the interrupt request of the converter control 12 is generated. When an interrupt request of the compressor drive control 11 is generated before the converter control signal is output, the compressor drive control 1
Even if the interrupt processing of No. 1 is started and the time when the converter control signal is originally output is reached, the compressor drive control 11
The signal for controlling the converter is not output until the interrupt processing of is completed, so that the DC voltage supplied to the compressor controlled by the converter is not stable and the rotation speed of the compressor is not stable. Was there.

In view of the above problems, the present invention has an object to stabilize the DC voltage controlled by the converter and suppress the fluctuation of the rotation speed of the compressor.

[0013]

In order to achieve the above object, the present invention is to preferentially execute an interrupt process for converter control over an interrupt process for compressor drive control. As a result, the time for starting the output of the signal for controlling the converter becomes constant, the DC voltage supplied to the compressor becomes stable, and fluctuations in the rotational speed of the compressor can be suppressed.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present invention, by setting the priority order of the converter control interrupt processing to the highest priority, the converter control interrupt processing is preferentially executed. According to this configuration, the time for starting the signal for converter control becomes constant, the DC voltage supplied to the compressor becomes stable, and fluctuations in the rotational speed of the compressor can be suppressed.

According to the second aspect of the present invention, the priority order of the converter control interrupt processing is set to be higher than the priority order of the compressor driving control interrupt processing, so that the compressor driving control interrupt processing is executed. , Interrupt processing for converter control is executed. According to this configuration, the time for starting the signal for converter control becomes constant, the DC voltage supplied to the compressor becomes stable, and fluctuations in the rotation speed of the compressor can be suppressed. (Embodiment 1) An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram of a control device for an air conditioner. Reference numeral 1 denotes a microcomputer, which is a compressor drive control timer 1a for generating a compressor drive control interrupt request at regular time intervals, and a converter control timer 1b for generating a converter control process interrupt request at regular time intervals. have.

Reference numeral 2 is an AC power source, 3 is a converter for converting an AC voltage supplied from the AC power source 2 into a DC voltage, 4 is an inverter device, 5 is a compressor, and 6 is 0 of the voltage of the AC power source 2.
It is a zero-cross detection means for detecting V. Reference numeral 7 denotes the zero-cross detection means 6 to the microcomputer 1 when the voltage of the AC power supply 2 is 0V.
8 is a signal input to the converter 5, 8 is a signal for controlling the converter 3 to control the increase / decrease of the DC voltage supplied to the compressor 5, and 9 is a signal for controlling the inverter device 4 to control the rotation speed of the compressor 5. It is a signal.

In the control device for an air conditioner having the above structure, the signal 7 output from the zero-cross detection means 6 is input to the microcomputer 1 and the input signal 7 is input.
Thus, the counting of the converter control timer 1b is started. When the converter control timer 1b counts a predetermined time and an interrupt request signal for converter control processing is output, the interrupt function of the microcomputer 1 operates and the microcomputer 1 outputs a signal 8 to the converter 3. Thus, the converter 3 is controlled, and the DC voltage supplied to the compressor 5 is controlled.

In addition to the converter control timer 1b, the compressor drive control timer 1a operates to count a predetermined time, and when an interrupt request signal for the compressor drive control process is issued, the interrupt function of the microcomputer 1 is performed. Operates to control the inverter device 4 and outputs a signal 9 for controlling the operation of the compressor 5 to control the rotational speed of the compressor 5.

Next, the control of the microcomputer 1 included in the control device of the present invention will be described with reference to the flowchart of FIG. The microcomputer 1 executes the processing of controlling the air conditioner in the processing 1 of the flowchart 10.
The steps 0a to 10d are repeatedly executed. For example, in the process 10a, the frequency is calculated, and in the process 10b, the fan motor is controlled. Further, in process 10c, the expansion valve is controlled, and in process 10d, communication with the indoor unit is performed.

At this time, when the compressor drive control timer 1a counts a predetermined time, an interrupt request of the compressor drive control process 11 is issued, and the process 1 of the flowchart 10 is executed.
Interrupts 0a to 10d, and executes the interrupt processing 11a (output processing of the signal 9 for driving the compressor 5) and 11b (processing for controlling the signal 9) of the flowchart 11 for controlling the driving of the compressor 5.

After executing the interrupt processes 11a and 11b, the interrupted processes 10a to 10d of the flowchart 10 are executed. Similarly, when the converter control timer 1b counts a predetermined time, an interrupt request of the converter control process 12 is generated, the processes 10a to 10d of the flowchart 10 are interrupted, and the DC voltage supplied from the converter 3 to the compressor 5 is changed. The interrupt processing 12a (output processing of the signal 8 for controlling the converter 3) and 12b (processing for controlling the signal 8) of the control flowchart 12 are executed.
After executing the interrupt processes 12a and 12b, the interrupted processes 10a to 10d of the flowchart 10 are executed.

In the microcomputer 1 which performs such processing, the counts of the compressor drive control timer 1a and the converter control timer 1b are finished at the same time, and the interrupt request of the compressor drive control 11 and the interrupt request of the converter control 12 are issued. When they occur at the same time, as shown in FIG. 3, the converter control 12 that performs the converter control interrupt processing 12a and 12b is set to be executed prior to the compressor drive control 11.

Similarly, the compressor drive control timer 1a counts a predetermined time, an interrupt request of the compressor drive control 11 is generated, and the interrupt process 11a of the compressor drive control 11 is performed.
Converter control timer 1 when executing 11b
b counts a constant value, and when an interrupt request of the converter control 12 occurs, the converter control interrupt processing 12a, 12b is given priority over the compressor drive control interrupt processing 11a, 11b as shown in FIG. Set to run.

Therefore, the signal 8 does not execute the interrupt processing 11 even if the compressor drive control timer 1a counts a constant value, and the signal 8 is output at the time when the output is originally started as shown in FIG. This makes it possible to suppress fluctuations in the rotation speed of the compressor 5.

The reason why the converter control can be given the highest priority in the present invention is the improvement of the processing speed of the microcomputer.

[0027]

As is apparent from the above description, according to the present invention, by executing the interrupt process of the converter control with priority over the interrupt process of the compressor drive control,
The DC voltage supplied to the compressor is stable, and fluctuations in the rotation speed of the compressor can be suppressed.

[Brief description of drawings]

FIG. 1 is a block diagram of a control system of an air conditioner showing an embodiment of the present invention.

FIG. 2A is a main control flowchart in the microcomputer according to the embodiment of the present invention, and FIG. 2B is a compressor drive control flowchart in the microcomputer according to the embodiment of the present invention. Converter control flowchart

FIG. 3 is a flowchart showing an example of a control mode when an interrupt occurs in the embodiment of the present invention.

FIG. 4 is a flowchart showing another example of a control mode when an interrupt occurs in the embodiment of the present invention.

FIG. 5 is a waveform diagram of a control signal output to the converter according to the embodiment of the present invention.

FIG. 6 is a flowchart showing an example of a control mode when an interrupt occurs in a conventional example.

FIG. 7 is a flowchart showing another example of a control mode when an interrupt occurs in the conventional example.

FIG. 8 is a waveform diagram of a control signal output to a converter in a conventional example.

[Explanation of symbols]

1 microcomputer 1a Compressor drive control timer 1b Converter control timer 2 AC power supply 3 converter 4 inverter 5 compressor 6 Zero-cross detection means 10 Normal treatment of air conditioners 11 Compressor drive control interrupt processing 12 Converter control interrupt processing

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hirofumi Noma             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Toruhiro Harada             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Yasuhisa Ninomiya             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 3L060 AA02 CC10 DD02 EE02                 5H730 BB11 CC01 FD11 FF09 FG01                       FG12 FG18

Claims (3)

[Claims] 1. An inverter device for driving a compressor in a variable capacity, a converter for converting an AC voltage from a power supply into a DC voltage in a variable capacity and supplying the DC voltage to at least the inverter device, and an AC voltage of 0 V of the power supply. Control having a zero-cross detection means for detecting a potential and a microcomputer for receiving a 0V potential signal output from the zero-cross detection means to control the converter and output a control signal of a DC voltage to be supplied to the compressor An air conditioner control device, wherein the microcomputer prioritizes and executes a control signal output process to the converter. 2. The control device for an air conditioner according to claim 1, wherein the converter control process is executed at least prior to the compressor drive control process. 3. The control device for an air conditioner according to claim 1, wherein the converter control process and the compressor drive control process are executed by using an interrupt function of a microcomputer.