JP2000172321A - Controller for unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controller of a unit, which can previously prevent destruction of a switch controlling the conduction of fitted parts and whose wiring is simplified. SOLUTION: A switch means 28 is provided with a switch means controlling a switch and a control means transferring data with a control box 9 through a signal line 22 and controlling the switch means based on data. A temperature sensor 27A is provided with a temperature detection means detecting the temperature of the switch and a control means transmitting data which the temperature detection means detects to the control box 9 through the signal line 22.

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 equipment such as a commercial / home refrigerator, a low-temperature showcase, a prefabricated refrigerator, an air conditioner, and a vending machine.

[0002]

2. Description of the Related Art Conventionally, for example, a commercial refrigerator incorporates a compressor, a condenser, a cooler and the like constituting a cooling device, or a compressor and a condenser are separately provided, and a refrigerant discharged from the compressor is provided. Is condensed in a condenser and depressurized by a decompression device, and then supplied to a cooler to exert a cooling effect. Cooling to low temperature.

In addition, frost formed on the cooler by the cooling operation is heated and melted by a defroster (defrost heater), and dew adhering by a cooling action is removed by heating by a dew-proof heater. On the other hand, a condenser fan is provided around the compressor and the condenser, and the condenser fan is air-cooled by the condenser fan.

In order to perform such various operation controls,
The refrigerator is equipped with a controller constituted by a microcomputer. Further, various sensors for detecting the temperature of the inside of the refrigerator, the cooler, and the condenser are mounted, and switches for controlling the operation of mounted components such as a compressor, a defroster, a dew-proof heater, and a fan in the refrigerator are also mounted. And the controller controls the operation of the mounting parts by each switch.

[0005]

The switch for controlling the operation of the mounting component such as the compressor as described above is constituted by an AC control element such as a triac, and is provided between the mounting component and the power supply line. However, when they conduct, they generate heat. When the temperature of the switch itself becomes abnormally high due to this heat generation, there is a problem that the switch is destroyed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problem, and can prevent a switch for controlling the energization of a mounting component from being destroyed.
An object of the present invention is to provide a device control device in which wiring work is simplified.

[0007]

According to the present invention, there is provided a control device comprising: a signal line wired to a device; main control means connected to the signal line; a switch provided on a power supply line of a mounting part; A switching element connected to the signal line for controlling the switch, and a temperature sensor attached to the switch in an inductive manner and connected to the signal line, wherein the switching element includes switching means for controlling the switch, Storage means holding the ID code, transmission / reception means for transmitting / receiving data to / from the main control means via a signal line, and switching element side control means for controlling the switching means based on data from the transmission / reception means. The temperature sensor includes a temperature detecting element for detecting the temperature of the switch, a storage unit having its own ID code, and a main control unit via a signal line. Transmission / reception means for transmitting / receiving data, and sensor-side control means for receiving data detected by the temperature detecting element, writing the data in the storage means, and transmitting the data in the storage means to the main control means by the transmission / reception means. And

According to the present invention, the switching element side control means controls the switching means based on the data from the main control means received by the transmission / reception means via the signal line, and is provided on the power supply line of the mounting part. By controlling the switches, the main control means can execute the control of the attached parts without any trouble. Also, the sensor-side control means of the temperature sensor attached to the switch indirectly writes the data detected by the temperature detecting element to the storage means, and transmits the data to the main control means via the signal line by the transmission / reception means. The main control means can fetch data on the switch temperature without any trouble.

When the main control means detects that the temperature of the switch has risen to a predetermined high temperature based on the data taken from the temperature sensor, for example, the conduction of the switch by the switching element is determined. By making it intermittent, destruction of the switch due to an abnormal rise in temperature can be avoided.

In this case, since the storage means of the switching element has its own ID code, the main control means can identify the switching element only by connecting the switching element to the signal line, and the wiring of the switching element is completed. I do. Further, since the temperature sensor also has its own ID code in the storage means, the main control means can identify the temperature sensor only by connecting the temperature sensor to the signal line, thereby completing the wiring of the temperature sensor.

Thus, it is possible to wire the switching element and the temperature sensor by a so-called plug-in, and it is possible to considerably simplify the wiring. Further, since common software can be used on the main control means side irrespective of the number of switching elements and the like, it is possible to remarkably reduce costs by sharing parts on the main control means side.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic sectional view of a commercial refrigerator 1 as an embodiment to which the present invention is applied, and FIG. 2 is a wiring diagram of an electric system of the refrigerator 1. In FIG. 1, a refrigerator 1 has a main body 5 composed of a heat insulating box 2 opening to the front, and a storage room 3 inside the heat insulating box 2. The front opening of the storage room 3 is closed by a door 4 so that it can be opened and closed.

In the storage room 3, a cooler 6 constituting a refrigeration cycle of a cooling device and an in-compartment fan 7 driven by a motor are installed, and a temperature sensor for detecting the temperature in the storage room 3 is provided. 27 is also attached. In addition, an anti-condensation heater 8 for preventing dew condensation is provided at the opening edge of the heat-insulating box 2, and an operation panel 11 of a control box 9 as an external controller is attached to the front of the door 4.

On the other hand, a machine room 12 is formed below the heat insulating box 2, and in the machine room 12, together with the cooler 6, a compressor 1 constituting a refrigeration cycle of a cooling device.
3, a condenser 14, a condenser fan 16, and the like. When the compressor 13 is operated, the high-temperature and high-pressure refrigerant discharged from the compressor 13 dissipates heat in the condenser 14 and is condensed.
It is supplied to the cooler 6. In the cooler 6, the refrigerant evaporates and exerts a cooling function. Thereafter, the low-temperature gas refrigerant returns to the compressor 13 again.

When the in-compartment fan 7 is operated, the cool air cooled by the cooler 6 is circulated into the storage room 3, whereby the storage room 3 is cooled. The condenser fan 1
6 is operated, the outside air is supplied to the condenser 14, the compressor 1
These are air cooled as they ventilate 3. Further, when the dew-proof heater 8 is energized, the opening edge of the heat insulating box 2 is heated,
Dew condensation is prevented.

Next, in FIG. 2, reference numeral 21 denotes an AC power supply line (power supply line) wired in the main body 5 of the refrigerator 1;
Is a signal line for exchanging data. AC power line 2
1 and the signal line 22 are connected to the control box 9, and the AC power line 21 is connected to the compressor 13, the fans 7 and 16, and the drive board 26 of the dew-proof heater 8, and is connected to the signal line 22. Is connected to the control box 9 and the drive board 26.

The signal line 22 includes a chip-shaped temperature sensor 27 for detecting the temperature in the storage chamber 3 and the drive board 2.
6. A chip-like switching element 28 attached to 6
Are connected via connectors. Note that the switching element 28 includes the compressor 13, the fan 7,
16 and the anti-dew heater 8 are provided.

Further, a chip-shaped temperature sensor 27A provided on the drive board 26 for detecting the temperature of each photocoupler 69 described later is also connected to the signal line 22, as will be described in detail later.

The structure of the control box 9 is shown in FIG.
Shown in The control box 9 is provided with a controller (substrate) 36. This controller 36
It comprises a CPU (microcomputer) 31, a memory 32 as storage means, an I / O interface 33, a bus I / O interface 34 as transmission / reception means, and the like.

The control box 9 has an LED.
And a switch 38 as an input means, and a switch 39. The display 37 and the switch 38 are connected to the I / O interface 33.
Connected to the operation panel 11.

The bus I / O interface 3
Reference numeral 4 is connected to the signal line 22 via the switch 39, and exchanges data with the temperature sensors 27, 27A,...

The switch 39 is connected to an external personal computer P or the like via a communication line 42 such as a telephone line, and switches a signal system connected to the signal line 22 to a bus I in accordance with an instruction from the controller 36 or the personal computer P. The I / O interface 34 is switched to the communication line 42 and the connection between the bus I / O interface 34 and the communication line 42 is controlled.

The controller 36 has a predetermined communication protocol for performing data communication with the temperature sensors 27, 27A, the switching elements 28, the personal computer P, etc., and the temperature sensors 27, 27A,. It is assumed that software for identifying the elements 28... Has been set.

Next, the structure of the temperature sensors 27 and 27A is shown in FIG. The temperature sensor 27 and the temperature sensor 27
A has the same configuration, so here the temperature sensor 27A
Is described. The temperature sensor 27A includes a CPU 43 as a sensor-side control unit and a memory 44 as a storage unit.
And an I / O interface 46 as transmission / reception means
, An A / D converter 47, a sensor unit 48 as a temperature detecting element connected to the A / D converter 47, a capacitor 49 as a power storage element, a diode 51 as a rectifying element, and the like. I have.

In this case, the capacitor 49 is connected to the diode 5
1, and each element is connected to a connection point between the diode 51 and the capacitor 49. Signal line 2
2, a potential (high potential) of, for example, +5 V is applied, and the data is composed of pulses that fall from the high potential to a low potential of 0 V, for example.

When the temperature sensor 27A is connected to the signal line 22, power is supplied to each element as it is while the high-potential and low-potential pulse signals constituting data are at the high potential. Is also charged. During the low potential period, the capacitor 49 is discharged from the capacitor 49 to supply power to each element.

The temperature sensor 27A has Vcc (DC +
5V) A power supply terminal 45 is also provided, and is connected to a connection point between the diode 51 and the capacitor 49.
7A is configured such that if this Vcc power supply terminal 45 is connected to a power supply line, each element can operate also by power supply from the power supply line. That is, in this case, each element operates without filling the capacitor 49, so that the convenience is improved when it is desired to quickly operate the temperature sensor 27A at the time of inspection or the like.

Further, the CPU 43 takes in the temperature data detected by the sensor unit 48 via the A / D converter 47 and temporarily writes it into the memory 44. Then, the controller 36 is connected to the controller 36 via the signal line 22 by the I / O interface 46.
, The temperature data written in the memory 44 is transferred to the signal line 2 by the I / O interface 46.
2 to the controller 36.

Here, the memory 44 has a temperature sensor 27A.
An ID code of the sensor itself, identification data indicating that the sensor is a sensor, set value data such as an alarm temperature, a protocol for performing data communication with the controller 36, and the like are stored. If a failure has occurred in the temperature sensor 27A, the failure data is also written to the memory 44 and transmitted to the controller 36.

On the other hand, the structure of the switching element 28 is shown in FIG. The switching element 28 includes a CPU 58 as a switching element side control unit, a memory 59 as a storage unit, an I / O interface 61 as a transmission / reception unit, an I / O interface 62 as a driver, and an I / O interface 62 as a driver. , A transistor 63 as a switching means, a capacitor 64 as a power storage element, a diode 66 as a rectifying element, and the like.

In this case, the capacitor 64 is connected to the diode 6
6, and each element is connected to a connection point between the diode 66 and the capacitor 64. When the switching element 28 is connected to the signal line 22, power is supplied to each element as long as the high-potential and low-potential pulse signals constituting data are at the high potential as described above, and the capacitor 64 is also supplied to the capacitor 64. Charged. While the potential is low, the capacitor 64 discharges power to supply power to each element.

The switching element 28 is also provided with a Vcc (DC + 5V) power supply terminal 65 connected to the connection point between the diode 66 and the capacitor 64, as shown by the broken line in FIG. If connected, each element of the switching element 28 can operate even by power supply from the power supply line. That is, in this case, each element operates without filling the capacitor 64.
The convenience is improved when the user wants to operate the camera 8 quickly.

When ON / OFF data is transmitted from the controller 36 via the signal line 22 by the I / O interface 61, the CPU 58 turns ON / OFF the ON / OFF data.
The transistor 63 is turned on / off by the I / O interface 62 based on the F data.

Here, the memory 59 stores an ID code of the switching element 28 itself, identification data indicating that the switching element 28 is used, a protocol for performing data communication with the controller 36, and the like. If a failure has occurred in the switching element 28, the data is also written to the memory 59 and transmitted to the controller 36.

The switching element 28 includes a drive board 26
The above is wired as shown in FIG. That is, 69 is a photodiode 69A
And a phototriac 69B as a switch, 71 is a resistor, 72 is a diode as a rectifying element, and 74 is a capacitor as a power storage element.

In this case, the capacitor 74 is connected to the diode 7
2 is connected between the connection point of the diode 72 and the capacitor 74 and the collector terminal (indicated by S2 in FIG. 5) of the transistor 63 of the switching element 28.
1 and the photodiode 69A are connected in series. The terminal S1 (FIG. 5) of the switching element 28 is connected before the diode 72. The photo triac 69B is interposed between the AC power line 21 and the compressor 13, the fans 7, 15 and the dew prevention heater 8, respectively.

When the diode 72 is connected to the signal line 22, power is supplied to the photodiode 69A via the resistor 71 while the high-potential and low-potential pulse signals constituting data are at the high potential. , The capacitor 74 is also charged. While the potential is low, the capacitor 74 is discharged from the capacitor 74 to supply power to the photodiode 69A.

Incidentally, similarly, the diode 72 and the capacitor 7
Vcc power supply terminal 60 is connected to the connection point
If the power supply terminal 60 is connected to the power supply line, the photodiode 69A can operate even by power supply from the power supply line. That is, in that case, each element operates without filling the capacitor 74.
Convenience is improved when it is desired to operate quickly at the time of inspection or the like.

The temperature sensor 27A is attached to each photocoupler 69 on the drive board 26 by heat exchange as shown in FIG. 7, and the temperature of the photocoupler 69 of each switching unit 68 is detected by the sensor unit 48. I do. The temperature sensor 27A is connected to the same location as the terminal S1 of the switching element 28 and the GND on the drive board 26 as shown in FIG.
The wiring of 7A is also completed.

The operation of the above configuration will be described. In this case, it is assumed that the switch 39 connects the bus I / O interface 34 to the signal line 22. First, refrigerator 1
The operation at the completion of the assembly will be described. Each temperature sensor 27, 2
.. And the switching element 28... Are connected to the signal line 22.
First, each element (temperature sensors 27, 27
A, The connection state of the switching element 28) is scanned.

The CPUs 43 and 58 of the temperature sensor 27 and the switching element 28 have their own IDs stored in the memories 44 and 59 in response to polling from the controller 36.
Reply the code. The CPU 31 of the controller 36 determines the temperature sensor 27, 27A
And the connection state of the switching elements 28... Are stored in the memory 32, and thereafter, data is transmitted to each element using this ID code.

Next, the actual control operation will be described. The CPU 31 of the controller 36 polls the temperature sensor 27 at a predetermined cycle. This polling is performed based on the above-mentioned ID code. CPU 43 of temperature sensor 27
Transmits data on the temperature in the storage room 3 (temperature data) to the controller 36 in response to the polling as described above. The CPU 31 of the controller 36 temporarily writes the received temperature data into the memory 32, compares the temperature data with the set temperature, and outputs ON / OFF data to the signal line 22 together with the ID code of the switching element 28 corresponding to the compressor 13. Send.

Switching element 28 of compressor 13
CPU 58 receives ON / OFF data of its own ID code, and turns ON / OFF the transistor 63 based on the received data. ON of this transistor 63
By turning on / off, the photodiode 69A is turned on (light emission) / OFF (turns off), whereby the phototriac 69B is turned on (conduction) / OFF (discontinuation),
As a result, the compressor 13 is started / stopped.

Since the fans 7, 16 and the anti-condensation heater 8 are continuously energized, the ON / OFF data to that effect is
.. Are transmitted based on the ID codes of the corresponding switching elements 28. Each switching element 28 operates or energizes each fan 7, 16 or the dew-proof heater 8 based on the ON / OFF data.

Further, the CPU 31 of the controller 36 polls the temperature sensors 27A... At a predetermined cycle. This polling is also performed based on the aforementioned ID code. In response to this polling, the CPU 43 of the temperature sensor 27A transmits data (temperature data) relating to the temperature of the photo or 69 to the controller 36. The CPU 31 of the controller 36 temporarily writes the received temperature data into the memory 32, and compares the temperature data with a predetermined upper limit temperature.

Here, for example, the phototriac 69B of the photocoupler 69 for energizing the dew-proof heater 8 is always on (conducting), but the conduction causes the phototriac 69B to generate heat, which reaches an abnormally high temperature. Then, the photocoupler 69 will eventually be destroyed.

On the other hand, as described above, the CP
U31 compares the temperature data received from the temperature sensor 27A with a predetermined upper limit temperature. When the temperature of the photocoupler 69 increases due to the heat generated by the phototriac 69B as described above and reaches the upper limit temperature, the controller 3 detects
6 is photo triac 69A of photo coupler 69
At the time of N, data is transmitted to the switching element 28 so as to be intermittently turned ON (conductive).

In response to this, the CPU 58 of the switching element 28 turns on the transistor 63 intermittently, and makes the photodiode 69A emit light intermittently. As a result, the phototriac 69B of the photocoupler 69 becomes intermittently conductive, thereby reducing heat generation and avoiding destruction. This control is performed by the other photocoupler 69.
Is executed similarly.

If a failure has occurred in the temperature sensors 27, 27A,... Or each switching element 28,..., The failure data is transmitted from the CPU of each element to the controller 36. Upon receiving the failure data, the CPU 31 of the controller 36 displays the temperature sensor 27 on the display 37.
27A... Or the switching element 28... Further, the bus 39 is switched by the switch 39.
The / O interface 34 is connected to the communication line 42 to alert the personal computer P to that effect.

Further, when the CPU 31 of the controller 36 fails, the signal line 22 is connected to the communication line 42 by the switch 39 automatically or in accordance with an instruction from the personal computer P. Thus, the exchange of data between each of the temperature sensors 27, 27A,... And the switching element 28,..., Is replaced by the personal computer P, and each device is controlled by the control from the personal computer P.

The personal computer P has a plurality of refrigerators 1...
Are connected via the communication line 42, and when the control is changed by the personal computer P due to a failure as described above or according to an instruction from the personal computer P, the operation of each refrigerator 1. Centralized control. That is, in this case, for example, it is also possible to perform control such as shifting the activation timing of the compressors 13 of the refrigerators 1... To level power consumption.

In the embodiment, the present invention has been described using a commercial refrigerator. However, the present invention is not limited thereto, and various electric devices such as a home refrigerator, a low-temperature showcase, a prefabricated refrigerator, an air conditioner, and a vending machine, or The present invention is also effective for home automation and security systems in automobiles and houses.

[0053]

As described above in detail, according to the present invention, the switching element side control means controls the switching means based on the data from the main control means received by the transmission / reception means via the signal line, and controls the mounting component. The main control means can control the attached parts without any trouble because the switch provided on the power supply line is controlled. Also, the sensor-side control means of the temperature sensor attached to the switch indirectly writes the data detected by the temperature detecting element to the storage means, and transmits the data to the main control means via the signal line by the transmission / reception means. The main control means can take in data on the switch temperature without any trouble.

When the main control means detects that the temperature of the switch has risen to a predetermined high temperature based on the data taken from the temperature sensor, for example, the switch is turned on by the switching element. By making it intermittent, destruction of the switch due to an abnormal rise in temperature can be avoided.

In this case, since the storage means of the switching element has its own ID code, the main control means can identify the switching element only by connecting the switching element to the signal line, and the wiring of the switching element is completed. I do. Further, since the temperature sensor also has its own ID code in the storage means, the main control means can identify the temperature sensor only by connecting the temperature sensor to the signal line, thereby completing the wiring of the temperature sensor.

Thus, it is possible to wire the switching element and the temperature sensor by a so-called plug-in, and it is possible to remarkably simplify the wiring. Further, since common software can be used on the main control means side irrespective of the number of switching elements and the like, it is possible to remarkably reduce costs by sharing parts on the main control means side.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a commercial refrigerator according to an embodiment of the present invention.

FIG. 2 is an electrical wiring diagram of the refrigerator of FIG. 1;

FIG. 3 is a block diagram of an electric circuit of the control box.

FIG. 4 is a block diagram of an electric circuit of the temperature sensor.

FIG. 5 is a block diagram of an electric circuit of the switching element.

FIG. 6 is an electric circuit diagram of a switching unit using a switching element.

FIG. 7 is a perspective view of a photocoupler and a temperature sensor on a drive board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator 6 Cooler 7 Internal fan 8 Dew-proof heater 9 Control box 13 Compressor 14 Condenser 16 Condenser fan 22 Signal line 27, 27A Temperature sensor 28 Switching element 31, 43, 58 CPU 32, 44, 59 Memory 46, 61 I / O interface 48 Sensor unit 49, 64, 74 Capacitor 51, 66, 72 Diode 63 Transistor 68 Switching unit 69 Photocoupler 69A Photodiode 69B Phototriac

Continuation of the front page (72) Katsumi Maekawa 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Kazuya Imamura 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Tsutomu Ishikura 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 5H223 AA11 BB08 CC08 DD03 EE05 EE24

Claims (2)

[Claims] 1. A signal line wired to a device, a main control means connected to the signal line, a switch provided on a power supply line of a mounting part, and a switch connected to the signal line to control the switch. And a temperature sensor attached to the switch in a heat-exchange manner and connected to the signal line. The switching element has switching means for controlling the switch, and own ID code. Storage means, transmission / reception means for transmitting / receiving data to / from the main control means via the signal line, and switching element side control means for controlling the switching means based on data from the transmission / reception means, A temperature sensor, a temperature detecting element for detecting a temperature of the switch, a storage unit having its own ID code,
Transmitting and receiving means for transmitting and receiving data to and from the main control means via the signal line; fetching data detected by the temperature detecting element and writing the data in the storage means; A control device for a device, comprising: a sensor-side control unit for transmitting to a control unit. 2. The main control means, when detecting that the temperature of the switch has risen to a predetermined high temperature, based on data taken from the temperature sensor, determines that the conduction of the switch by the switching element is intermittent. The control device for a device according to claim 1, wherein: