JPH0462351A - Inverter controller for air conditioner - Google Patents

Abstract

PURPOSE:To enable free rewriting by a method wherein in an air conditioner, an EEPROM which is capable of reading-out and writing-in is connected to a microcomputer of an outdoor side controlling part, and such functions become possible as presetting of input current, turnover of functions, writing of set values of operation frequency and the like and automatic setting of connection conditions. CONSTITUTION:When a compressor 5 starts, a microcomputer 7 takes signals from a room side temperature sensor, a compressor, another temperature sensor 11 of an inverter part 4 and the like into an A/D converter 13 of the microcomputer 7, feeds back them to preset control conditions to change inverter wave synthesis, and adjusts room conditions to be preset controlled ones. If a power source OFF occurs in this state, control conditions written in a RAM are eliminated, but the control conditions written in an EEPROM 9 are kept as they are. At a time of restart, the control conditions in the EEPROM 9 are called out and written in the RAM, and therefore, the compressor 5 can be kept in operation without need of inputting the control conditions newly and manually. Thus, the preset control conditions can be retained by calling out when unexpected interruption of power source occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air conditioner having a refrigeration compression cycle, and particularly to an inverter control device for an inverter air conditioner.

[Conventional technology]

Conventionally, in an air conditioner in which a compressor, condenser, pressure reducer, and evaporator are connected in sequence to form a refrigeration compression cycle, the compressor can be operated steplessly by controlling the power frequency and voltage to the compressor. As shown in Figure 2, the inverter control device that can suppress room temperature fluctuations has an input power supply circuit in the outdoor unit, followed by a converter section for converting it to DC power and an inverter section that drives the compressor. is formed, receives the serial control signal from the indoor unit, imports it into the microcomputer in the outdoor control section, synthesizes the inverter signal waveform, and generates the specified power frequency and voltage in the inverter section using the power transistor drive circuit. A method has been adopted in which the compressor is driven by

In this case, it is necessary to write the control conditions for controlling the inverter section into the memory of the microcomputer in advance, and the mask R is used as the memory of the microcomputer.
Those with built-in OM and RAM are generally used.

Since control conditions are written in advance to the mask ROM when the microcomputer is manufactured, the memory contents can be retained until the microcomputer goes down, but the control conditions determined at the time of manufacturing the microcomputer cannot be rewritten, and new A microcomputer had to be developed each time a model was developed, which lengthened the development period and increased development costs.

To solve this problem, control conditions that need to be changed depending on the application or usage conditions can be manually written into the indoor unit using the operation switch when the air conditioner starts operating, and the written control conditions can be transferred to the outdoor unit. A method has been considered in which the information is transmitted and written into the RAM of the microcomputer of the outdoor unit, and used to control the outdoor unit.

However, in the case of RAM, writing or rewriting can be performed freely, but if the power is accidentally turned off, the written contents will be lost, so it is necessary to install a long-life battery (such as a lithium battery) for backup. Otherwise, it is necessary to manually write the information when restarting, which requires the use of expensive long-life batteries and the need to repeat the writing operation using complicated operation switches each time, which poses a practical problem.

In addition, to adjust the input current for microcomputer operation during production, adjustments on hardware such as volume resistors are used, and for settings such as model switching, V/F characteristics, and operating frequency, switching using jumper wires or A method using voltage input from an A/D converter is used, and adjustment work at the production stage is complicated and labor-intensive, creating an obstacle in production.

[Problem to be solved by the invention]

The present invention has been made in view of the above-mentioned conventional problems, and allows the control conditions of the inverter section, which are written in advance in the memory of the microcomputer, to be stored and retained regardless of whether the power is turned on or off, and the control conditions can be freely rewritten. The purpose of this invention is to provide an inverter control device that can perform the following functions.

(Means for Solving the Problems) In order to achieve the above object, a readable and writable EEPROM is connected to the microcomputer of the outdoor control section, and a read or write signal different from the above control signal is sent from the indoor control section. The control conditions stored in the RAM of the microcomputer of the outdoor control section are stored in the EEPROM, and the control conditions stored in the EEPROM are stored in the EEPROM even if the control conditions disappear due to an unexpected power-off, etc. The data is written to the RAM of the reading microcomputer.

[Effect]

According to the above configuration, an EEPROM that is rewritable and can retain memory even when the power is turned off is connected to the microcomputer of the inverter control device, and writing or rewriting is performed using a special serial signal that is not normally used for control during production process adjustment work. By creating a signal and sending it to the microcomputer in the outdoor control section, and writing the control conditions previously written in the RAM of the microcomputer to the EEPROM, the control conditions are memorized even when the power is turned off, and the indoor unit is activated when the indoor unit is restarted. By writing the control conditions into the RAM of the microcomputer using the special serial signal from the side, operation can be resumed without manual input of the control conditions by operating the indoor unit.

〔Example〕

Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of the outdoor controller of the present invention, in which an operation command signal for controlling the operation of the outdoor unit is sent from the indoor unit to the outdoor controller 1 in the form of an AC power supply and a serial signal. There is.

The AC power supply passes through an input power supply circuit 2 consisting of an external surge absorption circuit, a noise filter, etc., enters a converter section 3, is converted into a DC power supply, is connected to an inverter section 4 consisting of a power transistor module, and is connected to a three-phase connection of a compressor 5. ing.

The operation command signal in the form of a serial signal from the indoor unit enters the microcomputer 7 via the serial signal transmitting/receiving device 6, starts the microcomputer 7, and operates the inverter section 4 according to the control conditions stored in advance in the mask ROM or RAM. The signal waveforms of the compressor 5 are synthesized and supplied to the power transistor drive circuit 8, which controls the power transistor of the inverter section 4 to continuously control the operation of the compressor 5.

The microcomputer 7 includes an EEPROM 9 of the present invention.
is connected to the microcomputer 7 to read and save control conditions from the inspection jig using a special serial signal at the time of final product inspection.

The input power supply circuit 2 is provided with an input current sensor 10, and the inverter section 4 is provided with an overcurrent sensor 11 and an overtemperature rise sensor 12, which are connected to an A/Di converter 13 of the microcomputer.

When the compressor 5 starts, the microcomputer 7 detects the indoor room temperature sensor and the temperature sensor 1 of the compressor and inverter.
The signal from the 1st etc. is taken in by the A/D converter 13 of the microcomputer 7 and fed back to the preset control conditions to change the waveform synthesis for the inverter so that the indoor condition becomes the set control condition. I'm making adjustments.

If the power is turned off in this state, the control conditions written in the RAM will be erased, but the control conditions written in the EEPROM9 will be saved as they are, and when the power is restarted, the EEPR
By being called from the OM9 and written to the RAM, the operating state of the compressor 5 can be continued without newly manually inputting the control conditions.

Furthermore, by writing the adjustment range of the current detection function or temperature detection function in the EEPROM 9 in advance, it is possible to constantly compare the detected value of the detection function or temperature detection function with the adjustment range during operation. Detection circuit 14
It is possible to improve the detection accuracy and perform stable controlled operation.

In addition, the signals from various sensors are sent to the microcomputer 7.
By writing and storing information in EEPROM9 in chronological order from the RAM of
The failure state is stored in the EPROM 9, and by investigating the cause of the failure, it is possible to prevent recurrence and improve the efficiency of repair work.

〔Effect of the invention〕

As described above, in the present invention, a writable EEPROM is installed in the microcomputer of the outdoor unit control section, a special serial signal for writing or calling is sent from the indoor unit side, control conditions are written in the EEPROM, and the control conditions are written in the EEPROM. By calling this when a power outage occurs, preset control conditions can be maintained.

In addition, by rewriting the control conditions to be written, it is possible to easily develop control conditions for new models, and by making the hardware common for new models, it is possible to shorten development time and reduce hardware costs through commonality. I can do it.

In addition, it is easy to add or correct deficiencies in control conditions or program errors that tend to occur at the start of production, and even if additions or corrections occur, delays in start-up at the start of production can be recovered to a minimum.

Furthermore, by storing the adjustment values of the adjustment parts of the outdoor unit control part in EEPROM during the production stage, when readjustment is required due to an unexpected power outage or failure, readjustment values can be easily read out from EEPROM to RAM. It can be performed.

Additionally, even if the equipment breaks down due to a malfunction during use, the data from each detection sensor is stored in the EEPROM, making it easier to identify the cause of the failure, simplifying and speeding up repair work. can be achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an outdoor side control section of the present invention, and FIG. 2 is a block diagram showing the configuration of a conventional outdoor side control section. In the figure, 1 is an outdoor control section, 2 is an input power supply circuit, 3 is a converter section, 4 is an inverter section, 5 is a compressor, 6 is a serial signal transmitting/receiving device, 7 is a microcomputer, 8 is a power transistor drive circuit, 9 is an EEPROM, 10 is an input current sensor, ti is an overcurrent sensor, 12 is a temperature sensor, 13 is an A/D converter 14 is an input current detection circuit.

Claims (3)

[Claims] (1) An indoor control unit that sends a control signal to the outdoor unit based on the temperature set by the room temperature setting device and the indoor temperature detected by the temperature detector, and controls the operation of the outdoor unit, and controls the power frequency and voltage to the compressor. In an air conditioner configured with an outdoor control section including an inverter control device to control and a microcomputer that controls the inverter control device using control signals from the indoor control section, the microcomputer of the outdoor control section Readable and writable EEP
Connecting the ROM and generating a read or write signal different from the control signal from the indoor control section,
The control conditions stored in the RAM of the microcomputer of the outdoor control section are retained in the EEPROM, and the EEPROM is stored in case the control conditions disappear due to an unexpected power off, etc.
1. An inverter control device for an air conditioner, characterized in that control conditions held in the controller are read out and written into a RAM of a microcomputer. (2) The input current setting value, function switching, and inverter V/F are stored in the readable and writable EEPROM in advance.
2. The inverter control device for an air conditioner according to claim 1, wherein set values such as characteristics and operating frequency are written and control conditions are automatically set at the final production stage. (3) The device according to claim (1), wherein the readable and writable EEPROM stores control data during operation through a RAM of a microcomputer, thereby storing control data when an abnormality occurs. Inverter control device for air conditioners.