CN112856899B - Refrigerator with a door - Google Patents

Abstract

The invention stores the wiring from the heater in the substrate with the heater as much as possible. The refrigerator has: a plurality of chambers; a power plug capable of being electrically connected to an industrial power supply; a power supply substrate electrically connected to the power plug and having a part or all of a switching power supply circuit, an inverter module, and a compressor control microcomputer; a control substrate; a DC/DC conversion circuit disposed on the control board and generating a DC voltage lower than the commercial power supply; and a sensor driven by the DC voltage, wherein the power supply board and the control board are disposed in different chambers.

Description

refrigerator

This application is a divisional application for an invention patent application with an application number of 202010140938.9, an application date of March 3, 2020, and the name "refrigerator".

technical field

The present invention relates to a refrigerator.

Background technique

In Patent Document 1, a refrigerator control board accommodating portion 79 for accommodating the control board 71 is provided on the central side of the rear surface of the refrigerator, and a power supply board accommodating portion 82 for accommodating the power supply board 67 is provided in the machine room 83 (0027 to 0030, FIG. 6 ). ). The control board 71 is provided with a heater driver 60 ( FIG. 1 ) that drives the heaters 61 to 64 . The commercial power supply 1 is supplied to the power supply unit substrate 67 . In addition, the power supply unit board 67 includes external connection terminals 72 (0024, 0025) for connecting with the outside of a personal computer or the like.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2001-289549

SUMMARY OF THE INVENTION

The problem to be solved by the invention

The driving power sources of the plurality of heaters 61 to 64 in Patent Document 1 are not clear, but since losses occur with voltage conversion and AC/DC conversion from commercial power sources, the heaters 61 to 64 are preferably powered by commercial power sources or from commercial power sources. Power driver with fewer transitions. As described above, the heaters 61 to 64 are preferably electrically connected to the power supply board 67 which facilitates the supply of the commercial power supply 1. Therefore, in the control board 71 of Patent Document 1 including the heater driver 60, there is room for improvement in wiring efficiency and the like.

solutions to problems

The present invention completed in view of the above situation is a refrigerator, which has:

multiple chambers;

A power plug capable of being electrically connected to an industrial power source;

a power supply board electrically connected to the power plug and having a switching power supply circuit, an inverter module and a part or all of the compressor control microcomputer;

control board;

a DC/DC converter circuit that is arranged on the control board and generates a DC voltage lower than the commercial power supply; and

A sensor driven with this DC voltage,

The said power supply board and the said control board are arrange|positioned in the mutually different chamber.

Description of drawings

FIG. 1 is a front view of the refrigerator according to the embodiment.

Fig. 2 is a vertical cross-sectional view of the refrigerator according to the embodiment.

3 is a circuit block diagram of a power supply board and a control board of the refrigerator according to the embodiment.

4 is a schematic front view of the control board according to the embodiment.

FIG. 5 is a plan view of the machine room according to the embodiment.

6 is a control flowchart of the compressor of the embodiment.

7 is a setting diagram of a threshold value for high temperature determination of a compressor and a power supply board according to the embodiment.

Explanation of symbols

1—refrigerator, 2—refrigerator, 3—ice maker, 4—upper freezer, 5—lower freezer, 6—vegetable compartment, 7—refrigerator door switch, 8—refrigerator left door, 9—refrigerator Right door, 10—upper hinge, 11—lower hinge, 13—cooler, 14—compressor, 15—freezer fan, 16—machine room, 17—power board, 18—reactor, 19—machine room fan, 20—power plug, 21—heater load wiring (dotted line), 22—defrost heater, 23—refrigerator compartment bottom heater, 24—rotating divider heater, 25—vegetable compartment heater, 26—control board, 27—Control power wiring, 28—Freezer room temperature sensor, 29—Refrigerator room temperature sensor, 30—Control system load wiring (dotted line), 31—Box lamp LED, 32—Noise filter circuit, 33—Converter circuit, 34—inverter module, 35—compressor control microcomputer, 36—switching power supply circuit, 37—12V load drive circuit, 38—DC/DC conversion circuit, 39—in-box control microcomputer, 40—heater drive circuit , 41—heater microcomputer, 50—outer case, 51—inner case, 52—insulation material, 53—back panel, 91—compressor temperature sensor, 92—substrate temperature sensor, 93—12V system load drive circuit (output Signal side), 94-12V system load drive circuit (input signal side), 95-12V system load drive wiring (output signal side), 96-12V system load drive wiring (input signal side).

Detailed ways

[Refrigerator 1]

FIG. 1 is a front view of the refrigerator 1 of this embodiment. The refrigerator 1 has a refrigerator compartment 2, an ice maker compartment 3, an upper freezer compartment 4, a lower freezer compartment 5, and a vegetable compartment 6 as storage compartments in this order from the top. The refrigerator compartment left door 8 and the refrigerator compartment right door 9 for opening and closing the refrigerator compartment 2 are mounted on the front side of the refrigerator compartment 2 facing each other, and are fixed by an upper hinge 10 and a lower hinge 11, respectively. The openings on the front surfaces of the ice making compartment 3 , the freezing compartments 4 and 5 , and the vegetable compartment 6 are opened and closed by a drawer-type door. A well-known door sensor is arranged in the vicinity of each door, and the opening and closing of each door can be detected.

FIG. 2 is a longitudinal cross-sectional view showing the structure of the inside of the refrigerator 1 . In the refrigerator 1, cold air is generated by a refrigeration cycle including a cooler 13 and a compressor 14, and each storage compartment 2 to 6 of the refrigerator 1 is cooled by circulating the cold air by one or more fans represented by a freezer compartment fan 15. to a predetermined temperature range. The compressor 14 and the like are controlled by the power supply board 17 , and the fan and the like are controlled by the control board 26 . Each storage compartment is insulated from the outside air by a heat insulating material 52 stored between the outer box 50 facing the outside air and the inner box 51 facing the storage compartment.

The refrigerator compartment 2 is provided with a refrigerator compartment temperature sensor 29 , an interior light LED 31 , a shelf, and a rear panel 53 located behind the shelf.

The cooler 13 is located behind any one of the freezer compartments 3 , 4 , and 5 , and a defrosting heater 22 is provided below the cooler 13 . The refrigerator 1 can have, as other heaters, a refrigerator compartment bottom heater 23, a vegetable compartment heater 25, and a rotary partition heater 24 that are arranged on the wall surfaces of the refrigerator compartment 2 and the vegetable compartment 6 to suppress dew condensation, for example. The heater 24 is provided in the well-known rotating partition which is arrange|positioned at any one of the refrigerator compartment doors 8 and 9, and contributes to thermal insulation between the refrigerator compartment doors 8 and 9. As shown in FIG.

[Outline of the power supply board 17 (non-insulating board)]

The power supply board 17 is a board having at least a part of a region that is not insulated from the commercial power supply, and has a circuit for driving loads of high-voltage systems such as the compressor 14 and the heaters 22 to 25 . The power supply board 17 is provided on the back side (rear side) of the refrigerator 1 , and is accommodated in the machine room 16 in which the compressor 14 is accommodated. The machine room 16 is further provided with a machine room fan 19 that cools components in the machine room 16 such as the reactor 18 and the compressor 14 . The power supply board 17 is electrically connected to the commercial power supply via the power plug 20 . In addition, the machine compartment 16 may be located in the upper back surface side of the refrigerator 1, and may be located in the lower back surface side. A detachable machine room cover 161 is provided in a range including at least the back side of the machine room 16 .

[Outline of Control Board 26 (Insulating Board)]

The control board 26 is a board that is insulated from the commercial power supply even when the power plug 20 is electrically connected to the commercial power supply, and has a circuit for driving a load of a low-voltage system (eg, DC12V) such as a fan and lighting. The control board 26 is arranged in any one of the storage compartments. For example, the control board 26 is arranged in the refrigerator room 2 which is the storage room farthest from the machine room 16 (power supply board 17 ). Since it is less necessary for the user to operate the control board 26, it is preferably provided behind the rear panel 53 on the rear side of the storage compartment.

The control system load wiring 30 (dotted line in FIG. 2 ) which is the output wiring of the control board 26 , the freezing compartment fan 15 which is an example of the fan, the machine room fan 19 , the interior lamp LED31 which is an example of the lighting, and the cooling fan It is connected to the motor of the damper that opens and closes the passage.

The control board 26 is provided with input circuits for each sensor and switch, and is connected to a refrigerator compartment temperature sensor 29 as an example of a sensor, a freezer compartment temperature sensor 28, a sensor for detecting door opening and closing, or a refrigerator compartment door switch as an example of a switch 7 and so on. Input wiring is not shown.

[Circuit blocks of substrates 17 and 26]

FIG. 3 is a circuit block diagram showing an electrical system of the refrigerator 1 .

The power supply board 17 and the control board 26 have parts connected by communication and electricity, and can exchange information and electric power. For example, the control board 26 and the power board 17 are communicatively connected by inter-microcomputer communication and control power supply wiring 27 (dashed-dotted line in FIG. 2 ). Specifically, the heater microcomputer 41 of the power supply board 17 is connected in communication with the in-box control microcomputer 39 of the control board 26, and as the communication between the microcomputers, there is serial communication, for example. As a result, when the number of heaters is two or more (four in the present embodiment), the in-box control microcomputer 39 can use a smaller number of communication lines (for example, one) than the number of heaters to communicate via The heater microcomputer 41 performs control of each heater.

Then, the low-voltage side is generated by the switching power supply circuit 36 of the power supply board 17 and is electrically connected to the DC/DC conversion circuit 38 of the control board 26 , and the 12V (control system) generated by the switching power supply circuit 36 is supplied to the DC/DC conversion circuit 38 .

In addition, the compressor control microcomputer 35 of the power supply board 17 is connected to communicate with the in-box control microcomputer 39 of the control board 26 .

[Circuit of the power supply board 17]

The power supply board 17 that receives electric power from the commercial power supply includes: a switching power supply circuit 36 that generates a low-voltage DC power supply based on a high-voltage DC voltage; an inverter module 34 that supplies voltage to the motor of the compressor 14; and a compressor control that controls the inverter module 34 a microcomputer 35; and a heater microcomputer 41 that controls a plurality of heaters. Further, the power supply board 17 preferably includes a noise filter circuit 32 for reducing noise from commercial power supplies, and a reactor 18 for suppressing harmonic currents.

(Generate DC voltage from industrial power supply)

It is preferable that the commercial power supply supplied to the refrigerator 1 via the power plug 20 is an AC voltage shaped by the noise filter circuit 32 and the reactor 18 first. The AC voltage is supplied to the converter circuit 33 and converted into a high-voltage DC voltage (for example, DC280V).

(Driven by compressor 14 based on high voltage DC voltage)

A part of the high voltage direct current voltage (for example, DC280V) is supplied to the inverter module 34 .

The inverter module 34 converts the high voltage DC voltage into AC voltage according to a control signal from the compressor control microcomputer 35 , and outputs it to the motor of the compressor 14 . Thereby, the compressor 14 is variably controlled.

(Generation of low voltage power supply)

A part of the high-voltage direct current voltage (for example, DC280V) is supplied to the switching power supply circuit 36 . The switching power supply circuit 36 steps down the high-voltage DC voltage from the converter circuit 33 and converts it into a low-voltage power supply voltage using a switching transformer. Examples of power sources that are stepped down and converted by the switching power supply circuit 36 include P15V (power supply system) used as a power source for a control circuit inside the inverter module 34, and a power source for the compressor control microcomputer 35 and its peripheral circuits. Used P3.3V (power system). The above-mentioned power source is a non-isolated power source because the inverter module 34 and the compressor control microcomputer 35 are electrically connected to the commercial power source. In order to control the inverter module 34, the reference potentials (P0V) of P15V (power supply system) and P3.3V (power supply system) are the same as the reference potential of the DC voltage from the converter circuit 33, and are configured to be non-isolated from the commercial power supply .

There is 12V (control system) supplied to the control board 36 via the control power supply wiring as the power source converted by the step-down conversion by the switching power supply circuit 36 . The 12V (control system) is isolated from the industrial power supply by a switching transformer. The 12V (control system) is electrically connected to the control board 26 via the control power supply wiring.

In FIG. 3 , the primary side (non-isolated) area is a circuit structure that is not isolated from the commercial power supply (power plug 20 ), and the secondary side (isolated) area is a circuit structure that is isolated from the commercial power supply.

(Heater drive)

The power supply board 17 further includes a heater drive circuit 40 having switches that turn on and off the power supply to each of the heaters 22 to 25 , and a heater microcomputer 41 that controls switches of the heater drive circuit 40 (for example, Insulating elements such as photocouplers and SSRs can be used.). It is preferable to supply the high-voltage power supply having passed through the noise filter circuit 32 to the heater drive circuit 40 . The heater microcomputer 41 outputs on-off commands of each switch via, for example, a photocoupler. This command is input to the heater microcomputer 41 from the below-mentioned in-box control microcomputer 39 via a communication line.

A heater load wiring 21 (broken line in FIG. 2 ) is routed from the power supply board 17 to each of the heater loads 22 to 25 . As heater loads, there are provided a defrosting heater 22 for removing frost adhering to the cooler 13, a refrigerator compartment bottom heater 23 for adjusting the temperature of the lower part of the refrigerator compartment, and a refrigerator compartment bottom heater 23 for preventing cold air from entering between the side doors for preventing The rotary partition heater 24 to which dew adhered to the rotary partition installed to leak, the vegetable compartment heater 25 for adjusting the temperature of the vegetable compartment 6 , and the like.

(Reading of operation information data (control record) from the machine room 19 side)

The operation information data (operation record) at each time, such as the detection values of various sensors of the refrigerator 1, the rotational speed of the compressor, the ON-OFF state of the heater, etc., are stored in the memory of the refrigerator 1, and the operation information data can be used. It can be inspected before shipment from the factory, or can be used for maintenance after installation in homes, etc. In order to connect the memory to other devices in a wired connection, it is necessary to establish a wired connection with a reader connector or the like of the board on which the memory is arranged.

The heater microcomputer 41 is connected to the memory 421 provided on the power supply board 17 , and stores the operation information data such as the temperature sensor values received from the inside control microcomputer 39 in the memory 421 for a fixed period. The power supply board 17 is provided with a read connector 431 for accessing the memory 421 . The read connector 431 is isolated from the industrial power source.

The memory 421 outputs data to other devices such as a personal computer via the read connector 431 . During industrial testing before shipment from the factory, the operation information data can be used to confirm the operation, or it can be used for analysis when a defect occurs. When the machine room 19 accesses the operation information data, the convenience is high.

The heater microcomputer 41, the memory 421, and the read connector 431 are made of 5V (controller) isolated from the commercial power supply in order to prevent electric shock to the operator using the read connector 431 and to prevent other equipment such as personal computers from malfunctioning due to grounding. System) The structure that the power supply operates. The same applies to the read connector 43 described below. The memory 42 and the read connector 43 are also provided on the control board 26 side. However, in the storage room where the control board 26 is arranged, for example, the area behind the detachable rear panel 53 is more difficult than the machine room 19 from the completion of the assembly. Access by the refrigerator 1 before shipment tends to become cumbersome.

Therefore, in the present embodiment, the read connector 431 is also provided on the power supply board 17 side, so that even in the refrigerator 1 in which the assembly is completed and access to the control board 26 is difficult, it can be accessed via the machine compartment 16 . Since the memory 421 is generally used for testing before shipment, it does not require a large storage capacity, and can be smaller than the memory 42 .

In addition, the memory 421 may not necessarily be connected to the heater microcomputer 41 , but may be connected to another microcomputer electrically insulated from the power plug 20 .

[Circuit of the control board 26]

The control board 26 has an in-box control microcomputer 39 that acquires detection values of sensors and door switches, and user operation data via the operation board, and controls each fan, lighting, damper, and the like based on the sensor detection information. The in-box control microcomputer 39 is preferably grounded.

(Generation of power supply used for driving sensors, etc.)

The control board 26 generates a 5V (control system) power supply (second DC voltage) for driving the sensor using the 12V (control system) power supply (first DC voltage) supplied from the power supply board 17 . Therefore, the control board 26 has the DC/DC conversion circuit 38 for further stepping down the 12V (control system) power supply. The DC/DC conversion circuit 38 is preferably grounded.

5V (control system) is used as a power source for the inside control microcomputer 39, each sensor, door switch, inside control microcomputer 39, etc. for low-voltage detection signals, and components for transmitting and receiving control signals. In particular, when noise is superimposed on the power supply of the sensor, the detection accuracy of the sensor decreases. For example, if noise is superimposed on a detection signal of a temperature sensor that detects temperature using an analog voltage, the temperature will be erroneously detected. In the present embodiment, the generation of 5V (control system) is performed on the control board 26 side, and the inverter module 34, the compressor control microcomputer 35, and the switching power supply circuit 36 can be separated from the structure where the noise is large due to high voltage. generated power from a distance. Therefore, it is possible to suppress a decrease in the detection accuracy of the sensor.

If this point is described in detail, in order to achieve high efficiency, the DC/DC conversion circuit 38 uses an IC that performs output voltage adjustment by a high-frequency switching operation such as a DC/DC converter. The DC/DC converter adjusts the switching period while monitoring the output voltage, and is therefore concerned about the influence of external noise. By mounting the DC/DC conversion circuit 38 on the control board 26 side, the inverter module 34 and the switching power supply circuit 36 which are noisy are far away, and the influence of external noise can be reduced.

In addition, the DC/DC conversion circuit 38 usually uses an IC for performing the above-described high-frequency switching operation and a coil for storing electric energy as constituent elements, and the high-frequency noise and leakage magnetic flux radiated from the above-mentioned elements are used in many cases. It may overlap with peripheral devices and wiring, and malfunction may occur.

FIG. 4 is a schematic front view of the control board 26 of the present embodiment. The DC/DC conversion circuit 38 is arranged on the board edge side of the control board 26 . In addition, the wiring 80 connected to the control board 26 does not pass through the vertical direction of the DC/DC conversion circuit 38 . Furthermore, it is preferable to provide a ground pattern 82 for controlling the power supply of the control system so as to surround the DC/DC conversion circuit 38 and between the connector 81 and the periphery thereof. As a result, it is possible to obtain a structure in which noise is less likely to be superimposed on other control elements and other wiring patterns on the control board 26 .

Moreover, the freezer compartment fan 15, the machine room fan 19, the interior lamp LED31, etc. are driven by 12V (control system) supplied from the power supply board 17. The in-box control microcomputer 39 has a 12V load drive circuit 37 that drives the above-mentioned 12V load.

(Reading the operation information data (control record) from the storage room side)

The control board 26 has a memory 42 for storing sensor detection values acquired by the control microcomputer 39 in the box, and a memory 42 for recording the driving state of each fan, lighting, and compressor 14 , and a read connector 43 for freely accessing the memory 42 . After the refrigerator is installed in a home or the like, access from the read connector 431 of the power supply board 17 is difficult because the machine room 19 is usually in contact with the wall surface. Therefore, the memory 42 and the read connector 43 are also provided on the control board 26 side in order to improve the accessibility during maintenance after installation.

In the present embodiment, read connectors are provided in the machine compartment 19 accessible from the back side of the refrigerator 1 and in the storage compartment accessible from the front side, respectively, but it is difficult to perform maintenance at home or the like. Access from the machine room 19 side is not limited to the storage room where access from the front side is easy, and a read connector may be provided on the side surface side. For example, a control board and a reading connector may be provided on the side wall of the storage compartment.

(Drive command for heaters 22 to 25)

The inside control microcomputer 39 uses the detection value of each sensor (temperature sensor, humidity sensor) to determine the energization rate of each heater 22 to 25, and transmits the energization rate of each heater to the heater microcomputer 41 that is communicatively connected . The heater microcomputer 41 drives the heater drive circuit 40 in accordance with an instruction from the in-box control microcomputer 39 . The heater drive circuit 40 receives the duty command, and switches the energization state of each heater with respect to the commercial power supply.

The heater microcomputer 41 is provided on the power supply substrate 17 for the purpose of reducing the number of wirings between the two substrates, and the instruction of the heater microcomputer 41 is performed by the in-box control microcomputer 39 . Therefore, there is a possibility that the communication between the heater microcomputer 41 and the inside control microcomputer 39 cannot be performed due to some reasons such as disconnection of the communication line. In the present embodiment, when the heater microcomputer 41 detects that the communication with the inside control microcomputer 39 is interrupted, in order to prevent an excessive temperature rise of the heater, in principle, the operation of the heater is stopped or the duty ratio is reduced . However, for a heater that is prone to condensation, such as the rotary separator heater 24, the duty ratio is maintained at a predetermined value or more, for example, 50% or more.

[Mechanical room layout]

FIG. 5 is a plan view of the inside of the machine room 16 according to the present embodiment.

The machine room 16 is provided with a compressor 14 that is not insulated from the commercial power supply 1 , a machine room fan 19 that is insulated from the commercial power supply 1 and controlled by an in-box control microcomputer 39 of the control board 26 , and, for example, a casing disposed in the compressor 14 . The compressor temperature sensor 91 for detecting the temperature information of the compressor 14 , the power supply board 17 , and the board temperature sensor 92 arranged in the vicinity of the power supply board 17 are provided. The compressor 14 is arranged on one side of the machine room fan 19, and the power supply board 17 is arranged on the other side. As exemplified in FIG. 3 , power is supplied from the 12V load drive circuit 37 to drive the machine room fan 19 , and the compressor 14 , the power supply board 17 , and its surroundings generate airflow for air cooling.

[Control when machine room fan 19 is abnormal]

The control board 26 includes a 12V load drive circuit 93 for outputting a signal from the in-box control microcomputer 39 to the 12V load drive circuit 37 , a 12V load drive wiring 95 for outputting a signal from the 12V load drive circuit 37 to the 12V load, and a feedback loop for the mechanical room fan 19 . The 12V load drive wiring 96 and the 12V load drive circuit 94 of the drive state (rotation pulse, current, Hall sensor information, etc.).

When the inside control microcomputer 39 cannot detect the feedback signal from the machine room fan 19 , for example, when the feedback is 0 rotation speed and 0 current, it is determined that the machine room fan 19 is abnormal. This is considered to be a case where the circuit patterns on the substrate such as the circuits 37, 93, and 94, and the wirings 95, 96 are disconnected, and the machine room fan 19 is normally driven, but no feedback is obtained. When the upper machine room fan 19 fails and cannot be driven. In the former case, cooling of the compressor 14 and the power supply board 17 can be performed, so that there is basically no problem even if the compressor 14 is continuously driven. In the latter case, cooling of the compressor 14 and the power supply board 17 cannot be performed, so the rotational speed of the compressor 14 is appropriately restricted or stopped while observing the temperature states of the compressor 14 and the power supply board 17 . Since the calorific value of the power board 17, the reactor 18 provided in the vicinity, and the inverter module 34 varies according to the rotation speed of the compressor 14, it is preferable to suppress the rotation speed of the compressor 14 when the power board 17 is overheated.

The abnormality determination result of the machine room fan 19 is used in step S101 of the following control flow. In addition, it is not necessary to determine the abnormality at the moment when the feedback cannot be obtained, but it may be determined when the feedback cannot be obtained continuously for a predetermined number of times.

FIG. 6 is a flowchart of rotational speed control of the compressor 14 . When the compressor temperature sensor 91 is high temperature (step S100, YES), the compressor 14 is stopped (step S105). When the compressor temperature sensor 91 is not high temperature (step S100, No), when the machine room fan 19 is abnormal (step S101, Yes) and the substrate temperature sensor 92 is high temperature (step S102, Yes), the compressor 14 is turned on stop (step S105). On the other hand, when the compressor temperature sensor 91 is not high temperature (step S100, No), when the machine room fan 19 is abnormal (step S101, Yes) and the substrate temperature sensor 92 is not high temperature (step S102, No), The rotational speed of the compressor 14 is restricted and lowered (steps S103, S106). When the compressor temperature sensor 91 is not high temperature (step S100, NO), and when the machine room fan 19 is not abnormal (step S101, NO), it can be determined that there is no problem even if the compressor 14 is driven, so that the normal operation can be performed. Driving is performed (steps S104, S106).

FIG. 7 is a setting diagram of threshold values for high temperature determination of the compressor 14 and the power supply board 17 . A hysteresis region (dead zone) may be provided in the determination of high temperature and non-high temperature of the compressor temperature sensor 91 and the substrate temperature sensor 92 . The hysteresis region is a numerical range in which the non-high temperature judgment value and the high temperature judgment value are set to different values and used as the upper and lower limits. If the detected temperature exceeds the high temperature determination value, it is determined as "high temperature" until the detected temperature is lower than the non-high temperature determination value after that. Then, if the detected temperature is lower than the non-high temperature determination value, after that, it is determined as "not high temperature" until the detected temperature is higher than the high temperature determination value. In the case illustrated in FIG. 7 , at time T1 , the detected temperature is higher than the high temperature determination value, so it is determined to be high temperature after that, and it is determined to be not high temperature before that.

[Other technical ideas]

The present application includes the following technical ideas.

(Item 1)

A refrigerator having:

A power plug capable of being electrically connected to an industrial power source;

a power substrate electrically connected to the power plug;

a plurality of heaters electrically connected to the power supply substrate respectively;

a plurality of switches capable of switching the respective on-off of the heater;

A control substrate electrically insulated from the above-mentioned power plug;

a heater microcomputer that is disposed on the power supply board and drives each of the switches according to an instruction from the control board; and

A communication line for communicatively connecting the heater microcomputer and the control board.

(Item 2)

A refrigerator having:

multiple chambers;

A power plug capable of being electrically connected to an industrial power source;

a power supply board electrically connected to the power plug and having a switching power supply circuit, an inverter module and a part or all of the compressor control microcomputer;

control board;

a DC/DC converter circuit that is arranged on the control board and generates a DC voltage lower than the commercial power supply; and

A sensor driven by this DC voltage,

The power supply board and the control board are arranged in different chambers from each other.

(In the case of focusing on item 2)

In the above-mentioned Patent Document 1, a refrigerator control board accommodating portion 79 for accommodating the control board 71 is provided on the center side of the rear surface of the refrigerator, and a power supply board accommodating portion 82 for accommodating the power supply board 67 is provided in the machine room 83 (0027 to 0030, Figs. 6). The control board 71 is provided with a heater driver 60 ( FIG. 1 ) that drives the heaters 61 to 64 . The commercial power supply 1 is supplied to the power supply unit substrate 67 . The power supply 66 is provided in the power supply unit substrate including the inverter circuit unit 17 , and the control substrate 71 is not provided with a power supply circuit ( 0028 , 0030 ).

If the power source 66 is formed in the vicinity of a noise source such as the inverter circuit unit 17 , the noise tends to be superimposed on the power source 66 . When the sensor or the like is driven by the voltage of the power supply 66, the detection accuracy of the sensor is lowered.

(Item 3)

A refrigerator is provided with a read connector on the back side, the front side or the side surface, respectively, and the read connector can access one or more memories storing operation information data.

(When focusing on item 3)

As described in the above-mentioned Patent Document 1, if the external connection terminals 72 are provided only on the substrate arranged on the rear side, the rear side of the refrigerator is usually in contact with the wall surface in the installed state in the home, making it difficult to access.

(Item 4)

A refrigerator having:

compressor;

a compressor temperature sensor located near the compressor;

A power supply board that is not insulated from the above compressor;

a substrate temperature sensor disposed near the power substrate;

a mechanical room fan that acts on the fluid around the compressor and the power base; and

a machine room that houses the compressor, the compressor temperature sensor, the power supply board, the board temperature sensor, and the machine room fan,

When the temperature of the above compressor temperature sensor is high, the compressor is stopped,

When the abnormality of the above-mentioned machine room fan is detected,

When the substrate temperature sensor is not high temperature, the compressor is driven,

When the temperature of the substrate temperature sensor is high, the compressor is stopped.

(In the case of focusing on item 4)

Japanese Patent Application Laid-Open No. 2009-264660 discloses that when the machine room fan (C fan) 20 stops abnormally, the control device 21 repeatedly restarts the C fan 20 for a preset number of times N (for example, three times). , and if it is actually restarted, it is determined that the C fan 20 is not malfunctioning, and the operation returns to normal operation (0025). In addition, when restarting is not possible, the compressor is stopped (0027).

When abnormal stop of the machine room fan is detected, it is actually considered that the machine room fan is not driven, or that the machine room fan is abnormally stopped due to disconnection of the path for transmitting the feedback signal of the machine room fan to the microcomputer. In the latter case, since the machine room fan itself can be driven, it is less necessary to immediately stop the compressor. When the compressor is stopped, cooling in the refrigerator is stopped, and a large loss is caused to the user.

Claims (5)

1. A refrigerator, characterized by comprising:

a plurality of chambers;

a power plug capable of being electrically connected to an industrial power supply;

a power supply substrate electrically connected to the power plug and having a part or all of a switching power supply circuit, an inverter module, and a compressor control microcomputer;

a control substrate;

a DC/DC conversion circuit which is disposed on the control board so as to be distant from the inverter module and the switching power supply circuit and generates a DC voltage lower than the commercial power supply; and

a sensor driven by the direct-current voltage,

the power supply substrate and the control substrate are disposed in different chambers,

the wiring connected to the control board does not pass through the vertical upper direction of the DC/DC converter circuit.

2. The refrigerator according to claim 1,

the control board includes: the above DC/DC conversion circuit; a connector; and a ground pattern disposed between the connector and the DC/DC conversion circuit.

3. The refrigerator according to claim 1 or 2,

the control board includes the DC/DC converter circuit and a connector, and has a wiring connected to the connector while avoiding a region overlapping with the DC/DC converter circuit in a front view of the control board.

4. The refrigerator according to claim 1 or 2,

the DC/DC converter circuit is disposed on the substrate edge side of the control substrate.

5. The refrigerator according to claim 1,

the control board includes: the above DC/DC conversion circuit; a connector; and a ground pattern for controlling a system power supply provided between the connector and the periphery of the DC/DC converter circuit.

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