JPH07332774A - Air conditioner - Google Patents

Abstract

PURPOSE:To match the cooling capacity of an air conditioner to an air conditioning load in a short time after an electric recovery by setting the driving frequency of a compressor at the time of operating before power interruption to a target frequency at the time of starting when power is recovered after the interruption and restarting. CONSTITUTION:A control command for automatically restarting an operation when an air conditioner is once stopped and then recovered if a power source 7 is interrupted is assembled with a microcomputer 6. Further, the microcomputer 6 stores the driving frequency of a compressor 2 in a memory in the microcomputer 6 during operation. If the power source 7 is recovered after its interruption, the conditioner is stopped by the power interruption, and automatically started by the recovery. The target driving frequency of the compressor 2 at the time of starting is set to the driving frequency immediately before the power interruption stored in the memory in the microcomputer 6, and started via a compressor inverter driver 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where a drive frequency is changed by an inverter, a compressor is controlled in rotation speed to perform capacity control, and the power is stopped again due to power interruption such as power failure, and power is supplied again. The present invention relates to an air conditioner having a power recovery operation function that automatically restarts operation according to a memory of an operation state before a stop.

[0002]

2. Description of the Related Art As described in Japanese Patent Application Laid-Open No. 1-256749, a conventional device is designed to automatically restart operation in accordance with the memory of the operating condition before the stop after power restoration.

[0003]

In the above-mentioned prior art, since the air conditioning load condition before the power failure is not taken into consideration when the operation is automatically restarted after the power is restored, the number of operating compressors is restarted after the air conditioning is restarted. Alternatively, there is a problem that it takes time to adjust the drive frequency to the air conditioning load.

An object of the present invention is to provide an air conditioner in a short time after power restoration when the air conditioner is temporarily stopped in the case of a momentary power failure and the computer to be cooled by the air conditioner continues to operate. This is to match the cooling capacity of the vehicle with the air conditioning load.

[0005]

In order to achieve the above object, the present invention stores a compressor drive frequency during operation before a power failure in a memory in a microcomputer, restores power and restarts operation. At times, the compressor drive frequency during operation before a power failure was used as the target frequency at startup.

In addition, the number of operating compressors and the driving frequency before the power failure are stored in the memory in the microcomputer, and when the power is restored and the operation is restarted, the number of operating compressors before the power failure. And start up the same number at the same time, and
The drive frequency during operation before a power failure was used as the target frequency at startup.

Further, a circuit for detecting a power failure time is provided on a printed circuit board on which a microcomputer is mounted, and when the power failure time is longer than a predetermined time stored in the microcomputer in advance, the target frequency at the time of startup is set to the operation before the power failure. The target frequency at the time of starting the normal air conditioner is not the compressor drive frequency at that time.

Further, when a circuit for detecting the power failure time is provided on a printed circuit board on which a microcomputer is mounted and the power failure time is longer than a predetermined time stored in the microcomputer in advance, the number of operating compressors and the target frequency at the time of startup are set. Is the number of compressors operating and the driving frequency before the power failure, but the number of compressors operating and the target frequency when the air conditioner is started normally.

[0009]

As described above, the compressor drive frequency can be returned to the state before the power failure in a short time after the air conditioner is restarted, and it is possible to adapt to the air conditioning load.

[0010]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram showing a configuration of a control unit of the air conditioner of the first embodiment, FIG. 2 is a flow chart of control of the first embodiment, and FIG. 3 is an air conditioner of the second embodiment. FIG. 4 is a block diagram showing the configuration of the control unit, FIG. 4 is a control flowchart of the second embodiment, FIG. 5 is a control flowchart of the third embodiment, and FIG. 6 is a control flowchart of the fourth embodiment.

(First Embodiment) As shown in FIG. 1, the air conditioner of this embodiment has a compressor 2, an indoor fan 3, an outdoor fan 4, a compressor inverter, and a printed circuit board 1 on which a microcomputer 6 is mounted. Operation control such as operation and stop is performed on the drive unit 5 and the like, and power is supplied from the power supply 7. Also, a circuit for detecting a power failure or power recovery is built in the printed circuit board 1, and when a power failure occurs in the power supply 7, the air conditioner is temporarily stopped, but automatically when power is restored. A control command for restarting the operation is incorporated in the microcomputer 6. Further, the microcomputer 6 stores the drive frequency of the compressor 2 in the memory inside the microcomputer 6 during the operation of the air conditioner. Here, when power failure occurs in the power supply 7, the air conditioner stops due to a power failure and automatically starts operation upon power recovery, but as shown in the control flow of FIG. The target drive frequency at startup is set to the drive frequency immediately before the power failure stored in the memory in the microcomputer 6, and the compressor inverter drive unit 5 is started. With the above operation, the air conditioner can return to the state before the power failure in a short time, and can adapt to the air conditioning load.

(Second Embodiment) As shown in FIG. 3, in this embodiment, the air conditioner comprises a compressor 8 and a compressor inverter drive unit 9 in addition to the first embodiment, and is composed of two compressors. Supports air conditioning load. At the time of normal start-up that is not the power-on / recovery start-up, the microcomputer 6 first sets either the compressor 2 or the compressor 8 first, and sets the predetermined drive frequency at start-up as the target value to the compressor inverter drive unit 5 or 9 To launch via. After the startup, if the air conditioning load is large, the drive frequency of the first compressor is increased, and if the cooling capacity is still insufficient, the second compressor is started and the two compressors are operated. Here, when a power failure occurs in the power source 7, the air conditioner stops due to a power failure and automatically starts operation upon power recovery, but as shown in the control flow of FIG. The number of operating compressors and the target drive frequency are set to the number of operating compressors and the drive frequency immediately before the power failure stored in the memory of the microcomputer 6. Then, when the number of operating compressors is two immediately before the power failure, they are simultaneously started via the compressor inverter drive units 5 and 9. From the above operation, the air conditioner can be restored to the state before the power failure in a short time, and the transition time from the operation of one compressor to the operation of two compressors can be eliminated, and the air conditioning load can be adapted. Becomes

(Third Embodiment) In this embodiment, a circuit for detecting a power failure time is provided on the printed circuit board 1 in addition to the control configuration of FIG. 1 of the first embodiment. At the time of normal start-up, which is not the power-on / restoring start-up, the microcomputer 6 sets the compressor 2 at the start-up by using a predetermined drive frequency as a target value.
To launch via. Also, at the time of power recovery and restoration, the target drive frequency at the time of starting the compressor 2 is set to the drive frequency immediately before the power failure stored in the memory in the microcomputer 6,
It is started via the compressor inverter drive unit 5. However, in this embodiment, the power failure time is detected by the circuit provided on the printed circuit board 1, and as shown in FIG. 5, when the power failure time is longer than the predetermined time stored in the microcomputer 6 in advance,
The target frequency at startup was not the compressor drive frequency during operation before a power failure, but the target frequency at startup of a normal air conditioner. With the above operation, the air conditioner can return to the state before the power failure in a short time, and can adapt to the air conditioning load. Also, if the power outage time becomes long, the pressure and temperature of the refrigeration cycle of the air conditioner may decrease, so even if the compressor drive frequency after startup is set to the drive frequency immediately before the power outage, it will be frozen. It takes time for the pressure and temperature of the cycle to return to the original state and does not change from the normal startup, and conversely, the startup at a predetermined drive frequency at startup enables stable startup in the refrigeration cycle state.

(Fourth Embodiment) In this embodiment, a circuit for detecting a power failure time is provided on the printed circuit board 1 in addition to the control configuration of the second embodiment shown in FIG. At the time of normal start-up that is not the power-on / recovery start-up, the microcomputer 6 first sets either the compressor 2 or the compressor 8 first, and sets the predetermined drive frequency at start-up as the target value to the compressor inverter drive unit 5 or 9 To launch via. Further, when the power is restored and restored, the number of operating compressors and the target drive frequency are set to the number of operating compressors and the drive frequency immediately before the power failure stored in the memory of the microcomputer 6, and the compressor inverter drive units 5 and 9 are set. To launch through. However, in this embodiment, the power failure time is detected by the circuit provided on the printed circuit board 1, and if the power failure time is longer than the predetermined time stored in the microcomputer 6 in advance as shown in FIG. The number of operating units and the target frequency are not the number of operating compressors and the operating frequency of the compressor before the power failure, but the number of operating units and the target frequency when starting the normal air conditioner. With the above operation, the air conditioner can return to the state before the power failure in a short time, and can adapt to the air conditioning load. Also, if the power outage time becomes long, the pressure and temperature of the refrigeration cycle of the air conditioner may decrease, so set the number of compressors operating after startup and the drive frequency to the state immediately before the power outage. Also, it takes time for the pressure and temperature of the refrigeration cycle to return to the original state, and it does not change from normal startup, and on the contrary, it stabilizes by starting with the specified number of compressors operating and the drive frequency at startup. It can be started in the refrigeration cycle state.

[0016]

According to the present invention, the air conditioner can be returned to the state before the power failure in a short time, and can be adapted to the air conditioning load.

[Brief description of drawings]

FIG. 1 is a block diagram of a control unit of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a flowchart of control of the air conditioner according to the first embodiment of the present invention.

FIG. 3 is a block diagram of a control unit of the air conditioning apparatus of the second embodiment of the present invention.

FIG. 4 is a flowchart of control of the air conditioner of the second embodiment of the present invention.

FIG. 5 is a flowchart of control of the air conditioner according to the third embodiment of the present invention.

FIG. 6 is a flowchart of control of the air conditioning apparatus of the fourth embodiment of the present invention.

[Explanation of symbols]

1 ... Printed circuit board, 2 ... Compressor, 3 ... Indoor fan, 4 ...
Outdoor fans, 5, 9 ... Compressor inverter drive section, 6 ... Microcomputer, 7 ... Power supply, 8 ... Compressor.

Claims (1)

[Claims] 1. A drive frequency is changed by an inverter to control the rotational speed of a compressor to perform capacity control, and a microcomputer control is used to stop after power interruption such as power failure and then to be supplied with power again before stop. In an air conditioner equipped with a power recovery operation function that automatically restarts operation in accordance with the memory of the operating status of the compressor, the compressor drive frequency during operation before a power failure is stored in the memory in the microcomputer and the power is restored. An air conditioner, wherein the compressor drive frequency during operation before a power failure is set as a target frequency at startup when the operation is restarted.