CN112955706A - Refrigerator with a door - Google Patents

Refrigerator with a door Download PDF

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Publication number
CN112955706A
CN112955706A CN201980070580.2A CN201980070580A CN112955706A CN 112955706 A CN112955706 A CN 112955706A CN 201980070580 A CN201980070580 A CN 201980070580A CN 112955706 A CN112955706 A CN 112955706A
Authority
CN
China
Prior art keywords
refrigerator
surge
thermostat
power supply
terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201980070580.2A
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Chinese (zh)
Inventor
堂田英则
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2018-204330 external-priority
Application filed by Sharp Corp filed Critical Sharp Corp
Publication of CN112955706A publication Critical patent/CN112955706A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D11/00Self-contained movable devices, e.g. domestic refrigerators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00General constructional features
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00Arrangement or mounting of control or safety devices

Abstract

The invention realizes a refrigerator which restrains the occurrence of faults caused by surge. In a refrigerator (10), a Thermostat (TM) outputs an external power supply voltage to an inverter control circuit (INV) in an on state, does not output the external power supply voltage to the inverter control circuit in an off state, and a surge countermeasure component (Sc) is connected between a supply line for supplying the external power supply voltage to the thermostat and a ground terminal (E).

Description

Refrigerator with a door
Technical Field
The present invention relates to a refrigerator.
Background
As a refrigerator having a simple configuration, a refrigerator (fixed speed compressor type refrigerator) having a fixed speed compressor that is on/off controlled by a thermostat with respect to an operation of a compressor for maintaining a temperature of a storage chamber is known. Further, a refrigerator (variable speed compressor type refrigerator) including a variable speed compressor controlled by an inverter is known as a refrigerator which can save more power.
Further, as disclosed in patent document 1, a variable speed compressor type refrigerator is being studied in which inverter control is performed by using a thermostat used in a refrigerator having the above-described fixed speed compressor, thereby achieving cost reduction. In the present technology, an inverter control circuit acquires temperature information of a storage room from a thermostat and controls a variable speed compressor.
Documents of the prior art
Patent document
Patent document 1: specification of U.S. Pat. No. 6134901
Disclosure of Invention
Technical problem to be solved by the invention
However, the output of the thermostat is a signal for turning on or off a commercial ac power supply from the outside. Therefore, in the variable speed compressor type refrigerator which achieves the above-described reduction in cost, the voltage from the commercial ac power supply from the outside is directly input to the inverter control circuit as a control signal.
In the fixed speed compressor type refrigerator, an output of the thermostat is directly input to a motor of the fixed speed compressor, or a relay for controlling an AC input of the motor of the fixed speed compressor. Since these are electrical components having high surge resistance, a surge that is mixed into the output of the thermostat from the commercial ac power supply system does not become a problem in particular. However, it has been found that if the output of the thermostat is directly input to the inverter control circuit, such a surge may be applied to cause a failure of the inverter control circuit.
An object of an aspect of the present invention is to realize a refrigerator that suppresses the occurrence of a malfunction of an inverter control circuit due to a surge in a variable speed compressor type refrigerator that uses a thermostat for temperature detection.
Means for solving the problems
In order to solve the above problems, a refrigerator according to an aspect of the present invention includes: the surge countermeasure component is connected between the supply line and the ground terminal, and the supply line supplies the external power supply voltage to the thermostat.
Effects of the invention
According to an aspect of the present invention, there is realized a refrigerator that suppresses occurrence of malfunction of an inverter control circuit due to surge in a variable speed compressor type refrigerator using a thermostat for temperature detection.
Drawings
Fig. 1 is a front view of a refrigerator according to a first embodiment.
Fig. 2 is a front view of the refrigerator according to the first embodiment in a state where a door is opened.
Fig. 3 is a bird's eye view of the refrigerator according to the first embodiment when viewed obliquely from the rear.
Fig. 4 is a schematic circuit diagram of the refrigerator according to the first embodiment.
Fig. 5 is a schematic diagram showing an external shape of a thermostat of a refrigerator according to a first embodiment.
Fig. 6 is a circuit diagram showing a specific example of the surge absorbing circuit of the refrigerator according to the first embodiment.
Fig. 7 is a schematic circuit diagram of a refrigerator according to a second embodiment.
Fig. 8 is a schematic circuit diagram of a fixed speed compressor refrigerator that shares a heat insulating box with the refrigerator according to the first embodiment.
Detailed Description
[ first embodiment ]
Hereinafter, an embodiment of the present invention will be described in detail with reference to fig. 1 to 6.
Fig. 1 is a front view of a refrigerator 10 according to the present embodiment. In the front face of the refrigerator 10, the door 11 covers substantially the entire face. Fig. 2 is a front view of the door 11 in a state of being opened. The refrigerator 10 has a storage chamber therein, and is composed of an upper freezing chamber 1300 and a refrigerating chamber 14. A receiving groove 12 is provided on the inner side of the door 11. The refrigerating compartment 14 is provided with a shelf 15 and a tray 16, and the refrigerating compartment 14 is appropriately partitioned. A dial 141 is disposed at a lateral position of the freezing chamber 13. The dial 141 is a dial for adjusting the set temperature of the thermostat 140 provided at a position not directly visible from the outside. In this way, in the refrigerator 10, the thermostat 140 is used to perform temperature setting of the storage chamber. Although not shown, the wall surface of freezing room 13 also serves as an evaporator, and the temperature of the entire storage room is maintained at a low temperature by cooling the evaporator. The entire storage room constituted by the freezing chamber 13 and the refrigerating chamber 14 is constituted as a heat-insulated box filled with a heat insulating material.
Fig. 3 is a bird's eye view of the refrigerator 10 viewed obliquely from the rear. A bottom space 17 opened toward the rear surface is provided at the bottom of the refrigerator 10. The bottom space 17 is a space in which a compressor and the like can be disposed. A power cord 110 for leading commercial ac power from the outside to the refrigerator 10 is drawn out from the bottom space 17 to the outside. In addition, a ground terminal 120(E) is provided at the base portion of the bottom space 17. Although not shown in fig. 3, an inverter control circuit INV and a surge absorption circuit SA, which will be described later, are also provided in the bottom space 17.
Fig. 4 is a circuit diagram showing an outline of the circuit configuration of the refrigerator 10. The area enclosed by the dotted line in the figure indicates the range of the bottom space 17. In fig. 4, the circuit portion disposed outside the bottom space 17 is an electrical component disposed in the heat insulating box. Terminals R1, R2, Et, T1, a2 and a1 are provided at the portions where the wiring is drawn from the heat insulating box to the bottom space 17.
The circuit in the heat-insulated box is constructed as follows.
The terminal R1 is connected to the interior lamp L via the door switch SW, and its return flow is connected to the terminal R2. Further, a wiring branched from the terminal R1 is connected to the terminal a1 and one end of the thermostat TM (140). The other end of the thermostat TM is connected to a terminal T1. A ground terminal of a conductive case 142 provided in the thermostat TM (140) is connected to the terminal Et. The terminal a2 is connected to the terminal R2.
The terminals R1 and R2 are a pair of terminals for supplying an external power supply voltage into the heat insulating box. The terminal a1 and the terminal a2 are a pair of service terminals for supplying an external power supply voltage to the compressor provided in the bottom space 17. The terminal T1 is a terminal for taking out a thermostat signal.
Fig. 5 shows an appearance of the thermostat 140. The thermostat 140 includes a conductive housing 142. The thermostat 140 includes a pair of external terminals 144 and a grounding terminal 143 provided on a conductive housing 142. The pair of external terminals 144 are connected to the terminal T1 and the terminal R1 by wiring. Further, the thermostat 140 includes a dial 141 for temperature setting and a capillary tube 146. The capillary 146 includes a temperature sensing unit at the tip and is fixed to a desired position in the storage chamber. For example, a temperature sensing unit of the capillary tube 146 is fixed to a wall surface of the freezing chamber 13.
The circuit in the bottom space 17 is configured as follows.
A pair of power supply lines 110 for introducing a power supply voltage from an external commercial power supply are connected to the pair of AC input terminals of the surge absorbing circuit SA in the vicinity of an introduction portion of the refrigerator 10 into the case. One AC output terminal L of the surge absorption circuit SA is connected to the terminal R1, and the other AC output terminal N is connected to the terminal R2. The ground terminal Es of the surge absorption circuit SA is connected to the ground terminal E (120). Terminal Et is connected to ground terminal E (120). Further, the ground terminal E is preferably connected to the ground of an external commercial power supply.
The terminal a1 and the terminal a2 are connected to an AC input terminal pair of the inverter control circuit INV. The terminal T1 is connected to a temperature signal input terminal of the inverter control circuit INV. The compressor control output (three-wire) of the inverter control circuit INV is input to the motor M of the variable speed compressor 130. The inverter control circuit INV and the ground terminal of the motor M are connected to the ground terminal E (120), respectively.
With the above circuit configuration, the in-box lamp L is turned on when the door 11 is opened by opening/closing of the door switch SW according to opening/closing of the door 11. The thermostat TM is in an on state when the detected temperature of the wall surface of the freezing chamber 13 rises above an upper limit temperature which is a set value, and outputs an on signal (external power supply voltage) to a terminal T1. When the detected temperature of the wall surface of freezing room 13 falls below the lower limit temperature which is a set value, thermostat TM is turned off, and does not output the external power supply voltage to terminal T1. In other words, the thermostat TM outputs a cut-off signal (no voltage) to the terminal T1 at this time. The inverter control circuit INV is activated by an AC input, and performs trigger control of the inverter based on the signal input from the thermostat TM to the temperature signal input terminal through the terminal T1. Then, the operation and the rotation speed of the motor M of the variable speed compressor are controlled to adjust the temperature of the storage chamber. Patent document 1 and other known techniques can be applied to such a control method.
Fig. 6 shows a specific example of the surge absorbing circuit SA. The surge absorption circuit SA includes a pair of AC input terminals, a pair of AC output terminals, and a ground terminal Es. In this specific example, the AC input terminal pair and the AC output terminal pair are directly connected by their respective lines. A surge countermeasure component Sn is connected between the pair of AC input terminals (between the pair of AC output terminals). This is to remove the normal mode noise by the surge countermeasure component Sn. A surge countermeasure component c is connected between the AC output terminal L connected to the terminal R1 connected to the thermostat TM and the ground terminal Es. This is to remove the common mode noise by the surge countermeasure component Sc.
Here, the surge countermeasure component is an electronic component having the following functions: when an overvoltage is applied between both terminals, a current flows through the surge countermeasure component (surge current is discharged). The surge countermeasure component can also be referred to as a surge absorbing component or a surge absorbing element. As the surge countermeasure component, a varistor, a surge arrester, a surge absorber, or the like can be used.
Further, two capacitors C are connected in series between a pair of AC output terminals on the AC output terminal side of the surge countermeasure components Sn and Sc, and a connection point between the capacitors C is connected to the grounding terminal Es. This constitutes a so-called Y capacitor. This is to prevent the switching noise generated by the inverter control circuit INV from leaking to the commercial power system.
According to the above configuration, the refrigerator 10 according to the first embodiment has the following advantages.
The refrigerator 10 is a variable speed compressor type refrigerator provided with an inverter control circuit INV and a variable speed compressor 130. Therefore, compared to a fixed speed compressor type refrigerator, low power consumption can be achieved.
Further, since the above-described specific circuit configuration is adopted, the heat insulating box, which is the box portion of the refrigerator 10, can be shared with the fixed speed compressor type refrigerator 90. Next, this point will be described with reference to fig. 8.
Fig. 8 is a schematic diagram of the circuit configuration of a fixed speed compressor refrigerator 90 that shares a heat insulating box with the refrigerator 10 according to the first embodiment. In the figure, a partial configuration of an electric circuit disposed in the heat insulating box body, which is a region other than the bottom space 17 surrounded by the broken line, is the same as the refrigerator 10 of fig. 4. Terminals R1, R2, Et, T1, a2, and a1 provided at the portions where the wiring is drawn out from the heat-insulating box to the bottom space 17 are also the same as those of the refrigerator 10 in fig. 4.
The circuit in the bottom space 17 is configured as follows.
A pair of power supply lines 110 for introducing an external commercial power supply are connected to the terminal R1 and the terminal R2. In this regard, the surge absorption circuit SA is omitted from the refrigerator 10 as a variable speed compressor type refrigerator. Terminal Et is connected to ground terminal E (120). Further, the ground terminal E is preferably connected to the ground of an external commercial power supply.
Terminal a1 and terminal a2 are connected to the AC input pair of motor m of fixed speed compressor 930 via relay RL. On/off control of the relay RL is performed by an output of the thermostat TM from the terminal T1. Further, the motor m may be directly driven by the output from the thermostat TM without using the relay RL. In this case, in fig. 8, the terminal on the side connected to the terminal a1 in the AC input pair of the motor m is connected to the terminal T1. It is understood that, in both cases where the relay RL is used and direct input is performed, the motor m is turned on/off by turning on/off the thermostat TM, and the temperature of the storage chamber is controlled. In addition, a PTC (Positive Temperature Coefficient) relay for starting the motor may be appropriately connected to the input of the motor m.
As can be understood by comparing fig. 4 and 8, in the refrigerator 10 as a variable speed compressor type refrigerator and the fixed speed compressor type refrigerator 90, the heat insulating cases including the internal circuit are interchangeable. In this way, if the structures of the heat insulating boxes including the internal circuits are not shared, it is difficult to ensure interchangeability. This is because the heat insulating material is filled in the wall of the heat insulating box, and the wiring cannot be changed after the heat insulating box is formed. In this regard, in the present invention, the terminals provided from the heat insulating box to the portion where the wiring is drawn out in the bottom space 17 are aligned. Therefore, the manufacturer can separately manufacture a variable speed compressor refrigerator and a fixed speed compressor refrigerator by providing various types of components as a compressor and a peripheral circuit in the open bottom space 17 of the prepared heat insulation box and connecting wires to respective terminals by using a connector or the like. Therefore, not only the inexpensive thermostat system is used as the temperature sensor, but also the heat insulating box can be mass-produced and separately manufactured as required, and the variable speed compressor refrigerator can be realized at a lower cost.
In the fixed speed compressor type refrigerator, no surge countermeasure is particularly taken against the output (terminal T1) of the thermostat TM. This is because the relay RL and the motor m are electric components having high resistance to a surge, and therefore the surge mixed into the output of the thermostat TM from the commercial ac power supply system does not become a problem in particular. However, in the refrigerator 10 in which the output of the thermostat TM is input to the inverter control circuit INV, such a surge becomes a problem as a cause of a failure of the inverter control circuit INV. As a result of various measures studied by the present inventors, a common mode noise (surge) between the ground and the terminals of the thermostat TM is a main cause of the surge that is mixed from the output of the thermostat TM and causes the inverter control circuit INV to malfunction.
As shown in fig. 4 and 6, in the refrigerator 10, a surge countermeasure component Sc for connecting the wiring to the ground terminal E is disposed on the side of a supply line (L line connected to the terminal R1) for an external power supply voltage from an external commercial power supply to the thermostat TM. Thereby, the common mode surge introduced from the terminal T1 to the inverter control circuit INV via the thermostat TM is effectively prevented.
The surge countermeasure component Sc is provided on the bottom space 17 side (the external commercial power supply side) of the terminal R1 before the supply line for supplying the external power supply voltage to the thermostat and the supply line for supplying the external power supply voltage to the inverter control circuit branch off in the heat shield box. Therefore, the surge of the AC input that can be introduced from the terminal a1 to the inverter control circuit INV is also prevented at the same time via the terminal R1. Thus, the surge absorbing circuit SA prevents, by one circuit, a surge that can be introduced into the inverter control circuit INV through the pair of AC input terminals (the compressor service terminals a1, a2) and the temperature signal input terminal (the terminal T1). Therefore, the inverter control circuit INV can be completely protected at low cost, as compared with a case where the surge absorption circuits are separately provided.
In the first embodiment, the case 142 of the thermostat TM is connected to the ground terminal E, whereby malfunction of the thermostat TM due to external noise can be prevented, and common mode noise is easily superimposed on the temperature signal input terminal of the inverter control circuit INV from the thermostat TM via the case 142. Therefore, since the surge countermeasure component Sc is connected between the line connected to the thermostat TM (the line of the terminal R1) and the ground, it is possible to remove the common mode noise between the terminal of the thermostat TM and the ground, and therefore, particularly when the thermostat TM is cut off, that is, when the terminal T1 is opened, it is possible to eliminate the possibility that the surge noise from the ground terminal E mixes into the temperature signal input terminal of the inverter control circuit INV to cause malfunction or cause malfunction of the inverter control circuit INV.
Further, surge absorbing circuit SA is provided in refrigerator 10 in the vicinity of an introduction portion of power supply line 110 into the refrigerator case. Therefore, the introduction of the surge itself into the refrigerator 10 is prevented in advance. For example, if the surge absorption circuit SA is provided immediately before the inverter control circuit INV, it is possible to prevent the surge itself that can be introduced into the inverter control circuit INV, but the surge passes through the wiring in the refrigerator. Accordingly, since the induced noise can be generated in the refrigerator, there is a possibility that a problem may occur in a case where another electronic device is disposed in the refrigerator. However, in the refrigerator 10, such a possibility is also prevented in the past. Here, the vicinity of the introduction portion of the refrigerator case refers to the inside of the portion drawn out of the refrigerator case next to the power supply line 110 in fig. 3. In the circuit diagram of fig. 4, the terminals of the fixed power supply line 110 are immediately adjacent to each other. Alternatively, in the circuit diagram of fig. 4, the surge absorbing substrate SA is directly connected to the terminal to which the power supply line 110 is fixed, without passing through another circuit board or a wiring in the heat insulating box.
In the surge absorption circuit SA, there is a possibility that a breakdown voltage for preventing switching noise generated by the inverter control circuit INV from leaking to the Y capacitor on the external power supply side is limited, and a failure may occur due to a surge from the external commercial power supply. However, in the refrigerator 10, since the surge absorbing circuit SA is provided with the surge countermeasure component Sc and the surge countermeasure component Sn on the upstream side (the external commercial power supply side) of the Y capacitor, the surge that damages the Y capacitor can be effectively removed.
[ second embodiment ]
Another embodiment of the present invention will be described below. For convenience of explanation, members having the same functions as those described in the first embodiment are given the same reference numerals, and the explanation thereof will not be repeated. The same applies to the following embodiments.
The refrigerator 20 according to the second embodiment has the same configuration as the refrigerator 10 shown in fig. 1 to 6. However, the configuration of the circuit in the bottom space 17 is different from that of the refrigerator 10. Fig. 7 is a circuit diagram showing an outline of the circuit of the refrigerator 20. The area enclosed by the dotted line in the figure indicates the range of the bottom space 17.
Terminals R1, R2, Et, T1, a2 and a1 provided at a portion where wiring is drawn from the heat insulating box to the bottom space 17 are the same as those of the refrigerator 10. The circuit in the bottom space 17 is configured as follows.
In the refrigerator 20, a circuit board 150 constituting an inverter control circuit INV and a surge absorption circuit SA is provided in the vicinity of the variable speed compressor 130.
A pair of AC input terminals of the surge absorption circuit SA are connected to a pair of wires connected to a pair of power lines 110 for introducing an external commercial power supply. The AC output terminal pair of the surge absorption circuit SA is input to the AC input terminal pair of the inverter control circuit INV within the circuit substrate 150. Further, one AC output terminal L of the surge absorption circuit SA is branched and connected to the terminal R1, and the other AC output terminal N is branched and connected to the terminal R2. The ground terminal of the inverter control circuit INV and the ground terminal Es of the surge absorption circuit SA are connected to the ground terminal E (120). The ground terminal of the inverter control circuit INV and the ground terminal Es of the surge absorption circuit SA may be connected to the circuit board 150 to be a common terminal. Further, the ground terminal E is preferably connected to a ground line of an external commercial power supply. The compressor control output (three-wire) of the inverter control circuit INV is input to the motor M of the variable speed compressor 130. The terminal Et and the ground terminal of the motor M are connected to the ground terminal E (120).
Since the AC input to the inverter control circuit INV is performed from the surge absorption circuit SA in the circuit substrate 150, no wiring is connected to the bottom space 17 side of the terminal a1 and the terminal a 2. However, the refrigerator 20 has a circuit configuration electrically similar to that of the refrigerator 10, except that the position of the surge absorption circuit SA is different. Therefore, in the second embodiment, the same effects as those of the first embodiment can be obtained, except for the difference in effects caused by the difference in the physical location where the surge absorption circuit SA is provided.
In the refrigerator 20, the surge absorption circuit SA and the inverter control circuit INV can be formed on the same circuit board 150. Alternatively, the circuit boards may be formed in the same case, even on different circuit boards. Therefore, the cost can be further reduced as compared with the case where the circuit board and the case are separately formed as in the first embodiment.
Further, in the second embodiment, the surge absorption circuit SA and the inverter control circuit INV can be mounted on the variable speed compressor 130 or the like, and can be packaged together with the variable speed compressor 130. Thus, the variable speed compressor refrigerator can be easily realized by merely replacing the conventional fixed speed compressor with the variable speed compressor and performing the wiring process, and the variable speed compressor refrigerator can be realized at lower cost and in fewer processes.
[ additional notes ]
In the above, in each embodiment, the case where each surge absorption circuit SA is a specific example is described. However, the specific structure of the surge absorption circuit SA is not limited to the above. For example, in the circuit diagram of fig. 6, the surge countermeasure component Sn between the pair of AC input terminals, the Y capacitor, or both of them can be omitted. Alternatively, in the circuit diagram of fig. 6, the surge countermeasure component connected to the ground may be applied to the AC input terminal side where the surge countermeasure component Sc connected to the ground is not provided. In addition, in order to more effectively prevent leakage of switching noise from the inverter control circuit INV, an X capacitor may be provided in the circuit. Further, the lines of the pair of AC input terminals and the pair of AC output terminals are directly connected to each other, but the present invention is not limited to this, and a filter element such as a coil may be interposed between the pair of AC input terminals and the pair of AC output terminals.
[ conclusion ]
The refrigerator according to embodiment 1 of the present invention includes: the method comprises the following steps: the surge countermeasure component is connected between the supply line and the ground terminal, and the supply line supplies the external power supply voltage to the thermostat.
According to the above configuration, in the variable speed compressor type refrigerator using the thermostat for temperature detection, it is possible to realize a refrigerator in which the occurrence of a failure of the inverter control circuit due to a surge is suppressed.
The refrigerator according to aspect 2 of the present invention may be such that, in aspect 1, the refrigerator includes a supply line that supplies the external power supply voltage to the inverter control circuit, and the surge countermeasure component is connected to an upstream side of a branch point between the supply line that supplies the external power supply voltage to the thermostat and the supply line that supplies the external power supply voltage to the inverter control circuit.
According to the above configuration, the inverter control circuit is not limited to a surge mixed from a supply line for supplying a power supply voltage to the thermostat, and the surge countermeasure component can collectively suppress the surge mixed from the supply line for supplying the power supply voltage.
The refrigerator according to aspect 3 of the present invention may include, in aspect 1 or 2, a power supply line that introduces the external power supply voltage, and the surge countermeasure component may be disposed in the vicinity of an introduction portion of the power supply line into the refrigerator case.
According to the above configuration, the inverter control circuit can suppress not only a surge mixed in from a supply line for supplying a power supply voltage to the thermostat but also a surge mixed in the refrigerator.
In the refrigerator according to aspect 4 of the present invention, in the above aspects 1 to 3, the surge countermeasure component may be disposed on the same substrate or in the same case as the inverter control circuit.
According to the above configuration, the surge countermeasure component and the inverter control circuit are not handled as separate components, and the variable speed compressor refrigerator can be realized at lower cost and in fewer processes.
In the refrigerator according to aspect 5 of the present invention, in the above aspects 1 to 4, the thermostat may include a conductive case, and a wiring connected to the ground terminal may be connected to the case.
According to the above configuration, the inverter control circuit can effectively suppress a surge that is mixed from a supply line that supplies a power supply voltage to the thermostat.
In the refrigerator according to aspect 6 of the present invention according to any one of aspects 1 to 5, the surge countermeasure component may include any one of a varistor, a surge absorber, and a lightning arrester.
With the above configuration, the surge countermeasure component can be specifically configured.
The present invention is not limited to the above embodiments, and various modifications can be made within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention. Further, new technical features can be formed by combining the technical methods disclosed in the respective embodiments.
Description of the reference numerals
10. 20 refrigerator
11 door
12 storage groove
13 freezing chamber
14 refrigerating compartment
15 shelf
16 tray
17 bottom space
110 power line
120 ground terminal (E)
130 variable speed compressor
140 Thermostat (TM)
141 dial
142 casing
143 terminal for grounding
144 external terminal
146 capillary
150 circuit substrate
INV inverter control circuit
SA surge absorption circuit
Sc, Sn surge countermeasure component

Claims (6)

1. A refrigerator, characterized by comprising:
a compressor, an inverter control circuit for controlling the compressor, a storage chamber, a thermostat provided in the storage chamber, a supply line for supplying an external power supply voltage to the thermostat, and a ground terminal,
the thermostat outputs the external power supply voltage to the inverter control circuit in an on state and does not output the external power supply voltage to the inverter control circuit in an off state,
a surge countermeasure component is connected between the supply line for supplying an external power supply voltage to the thermostat and the ground terminal.
2. The refrigerator of claim 1,
includes a supply line for supplying an external power supply voltage to the inverter control circuit,
the surge countermeasure component is connected to an upstream side of a branch point between a supply line for supplying an external power supply voltage to the thermostat and a supply line for supplying the external power supply voltage to the inverter control circuit.
3. The refrigerator according to claim 1 or 2,
comprises a power line for leading in the external power supply voltage,
the surge countermeasure component is disposed near an introduction portion of the power cord into the refrigerator case.
4. The refrigerator according to any one of claims 1 to 3,
the surge countermeasure component is disposed on the same substrate or in the same case as the inverter control circuit.
5. The refrigerator according to any one of claims 1 to 4,
the thermostat is provided with a conductive housing, and a wiring connected to the ground terminal is connected to the housing.
6. The refrigerator according to any one of claims 1 to 5,
the surge countermeasure component includes any one of a varistor, a surge absorber, or a lightning arrester.
CN201980070580.2A 2018-10-30 2019-10-28 Refrigerator with a door Pending CN112955706A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2018-204330 2018-10-30
JP2018204330 2018-10-30
PCT/JP2019/042207 WO2020090752A1 (en) 2018-10-30 2019-10-28 Refrigerator

Publications (1)

Publication Number Publication Date
CN112955706A true CN112955706A (en) 2021-06-11

Family

ID=70464434

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201980070580.2A Pending CN112955706A (en) 2018-10-30 2019-10-28 Refrigerator with a door

Country Status (3)

Country Link
JP (1) JPWO2020090752A1 (en)
CN (1) CN112955706A (en)
WO (1) WO2020090752A1 (en)

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