JP2015048964A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which operation control over a control load such as a compressor of a refrigerator by a microcomputer controlling the control load and power-ON/OFF control over the microcomputer may be reversed in operation order depending on characteristic variation of a bimetal type thermoswitch when electric power supply to the microcomputer is controlled by the bimetal type thermoswitch.SOLUTION: In a refrigerator, a power supply relay switch (11) and a power supply switch (1), including a thermostat (12), which are connected in parallel control supply of an external source voltage to a load control part (2). On detecting change of the thermostat into a non-conduction state and a drop in compartment internal temperature by a temperature sensor (4), the load control part (2) starts a power-OFF process, and places the power supply relay switch in the non-conduction state after the power-OFF process. On detecting change of the thermostat into a conduction state, on the other hand, the load control part starts a restart process, and places the power supply relay switch in the conduction state once the temperature sensor detects the compartment internal temperature rises up to a second high-side temperature.

Description

  The present invention relates to a refrigerator, and more particularly to a refrigerator that can significantly reduce power consumption after stopping a cooling operation.

  In order to further reduce power consumption of the refrigerator, when the refrigerator internal temperature drops to the set temperature and loads such as compressors and circulation fans are stopped, power is applied to the load controller that controls the operation of those loads Developments are underway for technologies that can also block

  Patent Document 1 discloses a control load (compressor, damper, etc.) for controlling the internal temperature, a control means (microcomputer) for controlling the operation of the control load, and an energization control means (thermo switch) for controlling power supply to the control means. And a refrigerator comprising: The thermo switch is opened when the internal temperature is lower than “set temperature-Ta”, and closed when it is higher than “set temperature-Ta”.

  When the internal temperature reaches the set temperature, the microcomputer stops the control load. Further, when the internal temperature drops by Ta from the set value, the bimetal thermoswitch cuts off the power supply to the microcomputer. As a result, the power consumption of the microcomputer becomes zero when the inside cooling operation is stopped. Thereafter, when the inside temperature during the cooling operation stop exceeds the set value −Ta, power is supplied to the microcomputer via the thermo switch. During the refrigerator operation, the operation state of the microcomputer is stored in the EEPROM as needed to prepare for the state after the operation is resumed.

  Patent Document 2 discloses a configuration of a refrigerator-freezer in which a motor that drives an internal fan is a direct current motor and can be controlled to be driven and stopped by a CPU.

JP 11-325687 A JP-A-9-79727

  In the refrigerator of Patent Document 1, power supply control to the microcomputer is performed by a bimetal thermo switch. Depending on the characteristics variation of the bimetal type thermo switch, the magnitude relationship between "set temperature" and "set temperature-Ta", that is, the operation control of the control load by the microcomputer and the power supply / shut-off control sequence to the microcomputer is maintained. It is not always done. In some cases, the power supply to the microcomputer may stop before the control load is stopped by the microcomputer.

  The present invention includes a power switch that outputs an external power supply voltage applied to one end to the other end, a load control unit to which an external power supply voltage output from the other end of the power switch is applied, a relay switch, and an internal temperature. The power switch includes a thermostat whose conduction state changes depending on the internal temperature, and a power relay switch connected in parallel with the thermostat. The thermostat changes from a conduction state to a non-conduction state when the internal temperature decreases to the first low temperature side temperature, and conducts from the non-conduction state when the internal temperature rises to the first high temperature side temperature higher than the first low temperature side temperature. The load control unit converts the external power supply voltage into a DC voltage and outputs the power supply circuit, and the DC voltage is applied and the power relay switch and the relay switch are turned on. The relay switch supplies an external power supply voltage output from the other end of the power switch or a DC voltage output from the power supply circuit to the control load, and the control circuit is in a conduction state of the thermostat. When the temperature sensor detects a change from the first to the non-conducting state and the temperature sensor detects that the internal temperature has decreased to the second low temperature side temperature lower than the first low temperature side temperature, the power shutdown processing is started and the power cutoff After the process is completed, the power relay switch is set to a non-conductive state, and when a change from the non-conductive state of the thermostat to the conductive state is detected, a restart process is started, and the temperature sensor is a second higher than the first high temperature side temperature. When it is detected that the internal temperature has risen to the high temperature side temperature, the power supply relay switch is set to a conductive state.

  The present invention includes a power switch that outputs an external power supply voltage applied to one end to the other end, a load control unit to which an external power supply voltage output from the other end of the power switch is applied, a relay switch, and an internal temperature. The power switch includes a thermostat whose conduction state changes depending on the internal temperature, and a power relay switch connected in parallel with the thermostat. The thermostat has a first internal temperature. When the temperature is lowered to the low temperature side temperature, the conductive state changes to the non-conductive state, and when the internal temperature rises to the first high temperature side temperature higher than the first low temperature side temperature, the non-conductive state changes to the conductive state. A power supply circuit that converts an external power supply voltage into a DC voltage and outputs the power supply circuit, and a control circuit that is applied with the DC voltage and controls a conduction state of the relay switch. The switch supplies an external power supply voltage output from the other end of the power switch or a DC voltage output from the power supply circuit to the control load, and the control circuit detects a change from the conduction state of the thermostat to the non-conduction state. , Start the power shutdown process, and after the power shutdown process is completed, set the power relay switch to the non-conductive state, and when the change from the non-conductive state of the thermostat to the conductive state is detected, the restart process starts and the restart process It is a refrigerator which sets a power supply relay switch to a conduction | electrical_connection state after completion or in parallel with a restart process.

  In the refrigerator of the present invention, the control load includes a cooling fan and a damper, and the power shut-off process stops the cooling fan and closes the damper.

  In the refrigerator of the present invention, the control load includes a compressor, and the power shut-off process stops the compressor and opens the pressure valve of the refrigeration circuit connected to the compressor.

  In the refrigerator of the present invention, the power shutoff process is a process of writing the state of the refrigerator in the storage device.

  In the refrigerator of the present invention, the restart process is a process for writing the state of the refrigerator stored in the storage device during the power-off process to the control circuit.

  ADVANTAGE OF THE INVENTION According to this invention, the low power consumption refrigerator which can control the stable internal temperature is implement | achieved.

3 is a circuit diagram of the refrigerator according to Embodiment 1. FIG. FIG. 4 is a timing chart for explaining the operation of the refrigerator according to the first embodiment. 6 is a circuit diagram of a refrigerator according to Embodiment 2. FIG. FIG. 10 is a timing diagram for explaining the operation of the refrigerator according to the second embodiment. 6 is a circuit diagram of a refrigerator according to Embodiment 3. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the embodiments, when the number, amount, or the like is referred to, the scope of the present invention is not necessarily limited to the number, amount, or the like unless otherwise specified. In the drawings of the embodiments, the same reference numerals and reference numerals represent the same or corresponding parts. Further, in the description of the embodiments, the overlapping description may not be repeated for the portions with the same reference numerals and the like.

<Embodiment 1>
FIG. 1 is a circuit diagram of a refrigerator 100 according to the first embodiment.

  The refrigerator 100 includes a power switch 1, a load control unit 2, a control load 3, a temperature sensor 4, a door switch 5, an interior lighting 5a, relay switches 6a to 6c, and power terminals T1 to T2.

  The power switch 1 includes a power relay switch 11, a thermostat 12, and a current detection circuit 13, and has a configuration in which the power relay switch 11 and the thermostat 12 are connected in parallel. One of the connection points of the power relay switch 11 and the thermostat 12 is connected to the power supply terminal T1, and the other connection point of the power relay switch 11 and the thermostat 12 is connected to the power supply node N. Commercial AC power (which means AC voltage and AC current), which is external AC power, is applied between power supply terminals T1 and T2 via plug PLG.

  As will be described later, the thermostat 12 changes its conduction state as the internal temperature of the refrigerator 100 rises and falls. The power relay switch 11 changes its conduction state in response to a power relay control signal s2 described later.

  The current detection circuit 13 outputs an energization detection signal s <b> 1 that is generated based on the current flowing through the thermostat 12. As an example, a current transformer is applied to the current detection circuit 13. The current detection circuit 13 is not limited to a current transformer, and may be any configuration (for example, a shunt resistor and a voltage measurement circuit) that can detect a current value flowing through the thermostat 12. Further, the current detection circuit 13 may be an operation monitor circuit built in the thermostat 12 or one circuit of a multipolar thermostat.

  The load control unit 2 includes a power supply circuit 21, a power supply wiring 23, and a control circuit 22. The power supply circuit 21 rectifies, smoothes, and reduces necessary AC power applied to the power supply node N, and supplies a DC voltage having a desired value to the control circuit 22 via the power supply wiring 23. The control circuit 22 is a microcomputer, for example.

  The temperature sensor 4 is a thermistor, measures the internal temperature, and outputs the measurement result to the control circuit 22.

  The control load 3 includes a cooling fan 3a, a damper 3b, and a compressor 3c. The cooling fan 3a, the damper 3b, and the compressor 3c are supplied with AC power output from the power switch 1 or DC power output from the power circuit 21 via relay switches 6a, 6b, and 6c, respectively. FIG. 1 shows an example in which AC power is supplied to the cooling fan 3a and the like via the relay switch 6a and the like. When supplying the DC power output from the power supply circuit 21 to the cooling fan 3a or the like, the power supply wiring 23 is branched instead of the wiring supplying the AC power from the power supply node N to the relay switch 6a or the like, and the DC power is supplied to the relay switch 6a or the like. Supply power.

  ON / OFF of the relay switches 6a to 6c is controlled by a relay control signal s3 output from the control circuit 22, and in a state where AC power is not supplied to the load control unit 2, the relay switches 6a to 6c are all turned off. Become. In FIG. 1, only the relay control signal s3 is shown in order to avoid the complexity of the drawing, but the control circuit 22 generates signals for individually controlling the relay switches 6a to 6c.

  The door switch 5 applies external AC power to the interior lighting lamp 5a via the power supply terminal T1. Whether the interior lighting 5a is turned on or off is determined by the open / close state of the door (not shown) of the refrigerator 100 (the open / close state of the door switch) regardless of the conduction state of the power switch 1.

FIG. 2 is a timing diagram for explaining the operation of the refrigerator 100 according to the first embodiment.
In FIG. 2, the horizontal axis indicates time, and the vertical axis indicates the state of each part included in the refrigerator 100. Hereinafter, the operation of each part will be described with reference to FIG.

(Operation at time t1)
When the compressor 3c of the control load 3 cools the inside of the refrigerator 100 and the inside temperature reaches the first low temperature side temperature TL at time t1, the thermostat 12 is switched from the conduction state (on) to the non-conduction state (off). To change. The current detection circuit 13 detects the on / off change of the thermostat 12, and changes the level of the energization detection signal s1 from the high level to the low level. At this time, since the power supply relay switch 11 is kept in a conductive state by the power supply relay control signal s2 output from the control circuit 22 of the load control unit 2, the power supply switch 1 supplies the external AC power to the power supply node N. The supply is continued and the control circuit 22 is in an operating state.

  The control circuit (microcomputer) 22 detects that the energization detection signal s1 is at a low level, and the temperature inside the chamber has decreased to a second low temperature side temperature TLL that is lower than the first low temperature side temperature TL. When this is detected, the power shutdown process is started. In the power shut-off process, for example, the cooling fan 3a is turned off and the damper 3b is closed, so that the internal temperature is hardly increased when the power is shut off, and the compressor 3c is stopped. After the compressor 3c is stopped, the pressure valve (not shown) of the refrigeration circuit connected to the compressor 3c may be opened and set to an appropriate state for restarting the compressor. Further, the current state of the refrigerator 100 (such as the cumulative operation time of the compressor) is stored in a storage device such as a non-volatile memory incorporated in the control circuit 22 or externally attached to the control circuit 22. This power shutdown process is completed by time t2.

(Operation at time t2)
At time t2, the control circuit 22 sets the power relay switch 11 from the conductive state (on) to the non-conductive state (off) by the power relay control signal s2. Since thermostat 12 is already in a non-conductive state, supply of external AC power to load control unit 2 and control load 3 by power switch 1 is stopped at time t2.

(Operation at time t3)
After the time t2, the control load 3 stops cooling the inside of the refrigerator 100, so that the inside temperature gradually starts to rise. When the internal temperature reaches the first high temperature side temperature TH at time t3, the thermostat 12 in the power switch 1 changes from the non-conduction state to the conduction state. At this time, the power supply relay switch 11 is maintained in the non-conductive state, but the supply of the external AC power to the power supply node N is resumed via the thermostat 12 of the power supply switch 1. Note that the value of the first high temperature side temperature TH is set higher than the value of the first low temperature side temperature TL.

  When external AC power is supplied to the power supply node N, the power supply circuit 21 of the load control unit 2 resumes supplying DC voltage to the control circuit 22, and the current detection circuit 13 inverts the logic level of the energization detection signal s1. Let In response to the restart of the supply of the DC voltage to the control circuit 22 or the energization detection signal s1, the control circuit 22 starts the restart process.

  With this restart process, the control circuit 22 can detect the internal temperature by the temperature sensor 4. Further, the state of the refrigerator 100 saved in the nonvolatile memory or the like during the power-off process may be written back to the control circuit 22. In parallel with or before and after the restart process, the control circuit 22 sets the power relay switch 11 from the non-conductive state to the conductive state by the power relay control signal s2. At this time, since the thermostat 12 is already in a conducting state, there is no change in the supply status of the external AC power to the load control unit 2 by the power switch 1.

(Operation at time t4)
After time t3, the control circuit 22 can detect the internal temperature by the temperature sensor 4. At time t4, when the temperature sensor 4 detects that the internal temperature has reached the second high temperature side temperature THH higher than the first high temperature side temperature TH, the control circuit 22 performs relay based on the relay control signal s3. The switch 6c and the like are set to a conductive state, and the cooling of the refrigerator 100 is resumed.

(Operation after time t5)
When the compressor 3c cools the interior of the refrigerator 100 and the temperature in the interior reaches the first low temperature side temperature TL at time t5, the refrigerator 100 performs the same operation as after time t1.

Effects of refrigerator 100 according to Embodiment 1 are as follows.
(Realization of low power consumption that eliminates the influence of variation in characteristics of thermostat 12)
In the refrigerator 100, the current detection circuit 13 detects that the internal temperature has decreased to the first low temperature side temperature TL and the thermostat 12 has become non-conductive, and the internal temperature is the second low temperature side temperature TLL. After being detected by the temperature sensor 4, the supply of external AC power to the load control unit 2 is stopped. Further, the current detection circuit 13 detects that the internal temperature has risen to the first high temperature side temperature TH and the thermostat 12 is in the conductive state, and the internal temperature has increased to the second high temperature side temperature THH. Is detected by the temperature sensor 4, and the supply of the external AC power to the load control unit 2 is resumed.

  The temperature characteristics of the thermostat 12 vary greatly, and the assumed conduction state may not change at the first low temperature side temperature TL and the first high temperature side temperature TH. According to the refrigerator 100 according to the first embodiment, the current detection circuit 13 confirms the change in the conduction state of the thermostat 12 and then external AC to the load control unit 2 based on the measurement result of the internal temperature by the temperature sensor 4. The power stop is controlled. As a result, even if the temperature characteristic of the thermostat 12 is different from what is assumed, the external AC power to the load control unit 2 is based on the temperature measurement result of the temperature sensor 4 with high temperature measurement accuracy. A reliable stop is realized, and the power consumption of the load control unit 2 is reliably reduced.

(Adequate power supply stop and restart processing)
In the refrigerator 100, even if the internal temperature drops to the first low temperature TL and the thermostat 12 becomes non-conductive, the power supply relay switch 11 connected in parallel with the thermostat 12 energizes the control circuit 22. Is not blocked. On the other hand, the current detection circuit 13 inverts the logic level of the energization detection signal s1 in response to the thermostat 12 becoming non-conductive, and the control circuit 22 starts the power shutdown process. In this power-off process, the state of the refrigerator 100 before power-off is set and a state suitable for power-off is set. Then, after the power cut-off process is completed, the power relay switch 11 is set from the conductive state to the non-conductive state by the power relay control signal s2, and the power supply to the control circuit 22 is cut off.

  When the internal temperature rises to the first high temperature side temperature TH and the thermostat 12 becomes conductive, the current detection circuit 13 inverts the logic level of the energization detection signal s1, and the control circuit 22 starts the restart process. To do. In this restart process, the control circuit 22 performs necessary initial settings. Further, the control circuit 22 sets the power relay switch 11 from the non-conductive state to the conductive state by the power relay control signal s2, and prepares for the next non-conductive state of the thermostat 12.

  Thus, since the power shutdown process and the restart process can be executed, an increase in the internal temperature of the refrigerator 100 in the power shutdown state is suppressed, and normal operation of the control circuit 22 after the power is restored is ensured.

<Embodiment 2>
FIG. 3 is a circuit diagram of refrigerator 200 according to the second embodiment.

  The circuit diagram of the refrigerator 200 shown in FIG. 3 is the same as the circuit diagram of the refrigerator 100 according to Embodiment 1 shown in FIG. However, as will be described later, the power-off process and the restart process by the control circuit 22 included in the refrigerator 200 are started based on the detection result of the internal temperature by the thermostat 12 instead of the detection result of the internal temperature by the temperature sensor 4. The The temperature sensor 4 provided in the refrigerator 200 may be used for cooling capacity control during normal operation.

FIG. 4 is a timing diagram for explaining the operation of the refrigerator 200 according to the second embodiment.
In FIG. 4, the horizontal axis indicates time, and the vertical axis indicates the state of each part included in the refrigerator 200. Hereinafter, the operation of each part will be described with reference to FIG.

(Operation at time t11)
When the compressor 3c of the control load 3 cools the inside of the refrigerator 200 and the temperature inside the compartment is reduced to the first low temperature TL at time t11, the thermostat 12 is switched from the conduction state (on) to the non-conduction state (off). To change. The current detection circuit 13 detects the on / off change of the thermostat 12, and changes the level of the energization detection signal s1 from the high level to the low level. At this time, since the power supply relay switch 11 is kept in a conductive state by the power supply relay control signal s2 output from the control circuit 22 of the load control unit 2, the power supply switch 1 supplies the external AC power to the power supply node N. The supply is continued and the control circuit 22 is in an operating state.

  In response to the change in the logic level of the energization detection signal s1 at time t11, the control circuit 22 starts the power-off process. This power-off process is the same as the power-off process by the control circuit 22 provided in the refrigerator 100 according to the first embodiment, and redundant description is omitted. This power shutdown process is completed at time t21.

(Operation at time t21)
When the power cut-off process is completed at time t21, the control circuit 22 further sets the power relay switch 11 from the conductive state to the non-conductive state. Since thermostat 12 is already in a non-conduction state, supply of external AC power to load control unit 2 is stopped at time t21. As a result, all the relay switches 6a to 6c are turned off.

(Operation at time t31)
After time t21, the control load 3 stops cooling the inside of the refrigerator 200, so that the inside temperature gradually starts to rise. When the internal temperature reaches the first high temperature side temperature TH at time t31, the thermostat 12 in the power switch 1 changes from the non-conductive state to the conductive state. At this time, the power supply relay switch 11 is maintained in the non-conductive state, but the supply of the external AC power to the power supply node N is resumed via the thermostat 12 of the power supply switch 1.

  When the external AC power is supplied to the power supply node N, the power supply circuit 21 of the load control unit 2 resumes the supply of the DC voltage to the control circuit 22, and the current detection circuit 13 sets the logic level of the energization detection signal s1. Invert. In response to the restart of the supply of the DC voltage to the control circuit 22 or the energization detection signal s1, the control circuit 22 starts the restart process. By this restart process, the state of the refrigerator 200 saved in the nonvolatile memory or the like during the power shutdown process is written back to the control circuit 22.

(Operation at time t41)
In parallel with or before and after the restart process, the control circuit 22 sets the power relay switch 11 from the non-conductive state to the conductive state by the power relay control signal s2. FIG. 4 shows a case where the power relay switch 11 is set to the conductive state at time t41 after the restart process is completed. At time t41, since the thermostat 12 is already in a conductive state, the supply status of the external AC power to the load control unit 2 by the power switch 1 does not change.

  Further, based on the relay control signal s3, the control circuit 22 sets the relay switch 6c from the non-conductive state to the conductive state, and cooling of the refrigerator 200 is started. In FIG. 4, the power relay switch 11 and the relay switch 6c show a case where the conduction state changes at the same time. However, the power relay switch 11 and the relay switch 6c are not necessarily at the same time.

(Operation at time t51)
When the compressor 3c cools the inside of the refrigerator 200 and the internal temperature reaches the first low temperature side temperature TL at time t51, the refrigerator 200 performs the same operation as after time t11.

The effects of the refrigerator 200 according to Embodiment 2 are as follows.
Similarly to the refrigerator 100 according to the first embodiment, in the refrigerator 200 as well, in response to the thermostat 12 becoming non-conductive, the control circuit 22 starts the power shut-off process, and after the power shut-off process is completed, The relay switch 11 is set to a non-conductive state, and the energization to the control circuit 22 is cut off. In response to the thermostat 12 becoming conductive, the control circuit 22 starts the restart process, sets the power relay switch 11 to the conductive state after the restart process is completed, and sets the next thermostat 12 to be non-conductive. Prepare for conduction. As a result, an increase in the internal temperature of the refrigerator 200 in the power-off state is suppressed, and normal operation of the control circuit 22 after the power is restored is ensured.

  Further, it is not necessary to control power supply to the control load 3 and power supply to the control load 3 by the temperature sensor 4, thereby realizing a refrigerator having a more inexpensive and simple structure and control function. In particular, the configuration of the refrigerator 200 according to the second embodiment is suitable when a thermostat with small characteristic variation and characteristic variation can be used, or when high accuracy is not required for the refrigerator internal temperature control.

<Embodiment 3>
FIG. 5 is a circuit diagram of refrigerator 300 according to the third embodiment.

  In FIG. 5, components having the same reference numerals as those in FIG. 1 have the same configuration or function, and redundant description thereof is omitted.

  The refrigerator 300 includes an AC / DC conversion circuit 7 and an inverter 8. The AC / DC conversion circuit 7 is a general circuit that rectifies and smoothes AC power applied between the power supply terminals T1 and T2 to generate a DC output voltage having a desired value. The inverter 8 converts the DC output voltage generated by the AC / DC conversion circuit 7 into an AC voltage having a predetermined frequency.

  The load control unit 2A includes a power supply circuit 21A, a power supply wiring 23A, and a control circuit 22A. The power supply circuit 21A is a regulator circuit that generates a DC voltage obtained by stepping down the DC output voltage generated by the AC / DC conversion circuit 7 to a desired voltage value. The DC voltage generated by the power supply circuit 21A is applied to the control circuit 22A via the power supply wiring 23A. The control circuit 22A is different from the control circuit 22 shown in FIG. 1 in that the rotation speed instruction signal s4 is generated. The rotation speed instruction signal s4 is a signal for instructing the rotation speed of the compressor 3d, and the inverter 8 uses the DC output voltage of the AC / DC conversion circuit 7 based on the rotation speed instruction signal s4 to drive the compressor 3d. Convert to voltage.

  The control load 3A includes a compressor 3d, a cooling fan 3a, and a damper 3b. The compressor 3 d receives the AC voltage output from the inverter 8, operates at a designated rotational speed, and controls the internal temperature of the refrigerator 300.

  The DC voltage generated by the power supply circuit 21A is applied to one end of the relay switch 6a and the relay switch 6b via the power supply wiring 23A. The DC voltage is further applied to the cooling fan 3a and the damper 3b via the other ends of the relay switch 6a and the relay switch 6b, respectively. The conduction state of relay switches 6a and 6b is controlled by a relay control signal s3 output from control circuit 22A. In a state where AC power is not supplied to the load control unit 2A, the relay switches 6a and 6c are set to a non-conductive state.

  The power switch 1 controls the supply of external AC power to the AC / DC conversion circuit 7. When the power switch 1 is in a non-conductive state, the supply of external AC power to the AC / DC conversion circuit 7 is stopped, and the supply of DC output voltage to the load control unit 2A and the inverter 8 is also stopped. The power-off process and the restart process by the control circuit 22A are the same as those of the refrigerator 100 according to the first embodiment or the refrigerator 200 according to the second embodiment, and redundant description is omitted.

The effects of the refrigerator 300 according to Embodiment 3 are as follows.
In refrigerator 300, load control unit 2A and control load 3A operate in response to the output voltages of AC / DC conversion circuit 7 and inverter 8, respectively. By controlling the supply of external AC power to the AC / DC conversion circuit 7 with the power switch 1, the power consumption of the refrigerator 300 that eliminates the characteristic variation of the thermostat 12 is reduced, and the power supply is stopped and restarted. Optimization of processing is realized.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Power switch, 2, 2A load control part, 3, 3A control load, 3a Cooling fan, 3b Damper, 3c, 3d Compressor, 4 Temperature sensor, 5 Door switch, 5a Interior illumination light, 6a-6c Relay switch, 11 Power relay switch, 7 AC / DC conversion circuit, 8 Inverter, 12 Thermostat, 13 Current detection circuit, 21, 21A Power circuit, 22, 22A Control circuit, 23, 23A Power wiring, 100, 200 Refrigerator, N Power node, PLG Plug, s1 energization detection signal, s2 power relay control signal, s3 relay control signal, s4 rotation speed instruction signal, T1, T2 power terminal, TH first high temperature side temperature, THH second high temperature side temperature, TL first low temperature side temperature , TLL Second low temperature side temperature.

Claims (6)

A refrigerator,
A power switch that outputs an external power supply voltage applied to one end to the other end;
A load control unit to which the external power supply voltage output from the other end of the power switch is applied;
A relay switch;
A control load for controlling the internal temperature,
A temperature sensor for measuring the internal temperature;
With
The power switch is
A thermostat whose conduction state changes at the internal temperature;
A power relay switch connected in parallel with the thermostat;
Including
The thermostat changes from a conducting state to a non-conducting state when the internal temperature decreases to the first low temperature side temperature, and is nonconductive when the internal temperature rises to a first high temperature side temperature higher than the first low temperature side temperature. Change from state to conduction state,
The load control unit
A power supply circuit that converts the external power supply voltage into a DC voltage and outputs the same;
A control circuit to which the DC voltage is applied, and to control a conduction state of the power relay switch and the relay switch;
Including
The relay switch supplies the external power supply voltage output from the other end of the power switch, or the DC voltage output by the power supply circuit, to the control load,
The control circuit includes:
When detecting a change from the conduction state to the non-conduction state of the thermostat and the temperature sensor detects that the internal temperature has decreased to a second low temperature side temperature lower than the first low temperature side temperature, Start the shutdown process, after the power shutdown process is completed, set the power relay switch to a non-conductive state,
When a change from the non-conductive state to the conductive state of the thermostat is detected, a restart process is started, and the internal temperature of the temperature sensor has increased to a second high temperature side temperature higher than the first high temperature side temperature. The refrigerator which sets the said power supply relay switch to a conduction | electrical_connection state if detected. A refrigerator,
A power switch that outputs an external power supply voltage applied to one end to the other end;
A load control unit to which the external power supply voltage output from the other end of the power switch is applied;
A relay switch;
A control load for controlling the internal temperature,
With
The power switch is
A thermostat whose conduction state changes at the internal temperature;
A power relay switch connected in parallel with the thermostat;
Including
The thermostat changes from a conducting state to a non-conducting state when the internal temperature decreases to the first low temperature side temperature, and is nonconductive when the internal temperature rises to a first high temperature side temperature higher than the first low temperature side temperature. Change from state to conduction state,
The load control unit
A power supply circuit that converts the external power supply voltage into a DC voltage and outputs the same;
A control circuit to which the DC voltage is applied, and to control a conduction state of the power relay switch and the relay switch;
Including
The relay switch supplies the external power supply voltage output from the other end of the power switch, or the DC voltage output by the power supply circuit, to the control load,
The control circuit includes:
When detecting a change from the conduction state of the thermostat to the non-conduction state, start a power-off process, and after completing the power-off process, set the power relay switch to a non-conduction state,
When a change from the non-conductive state to the conductive state of the thermostat is detected, a restart process is started, and the power relay switch is set to a conductive state after the restart process is completed or in parallel with the restart process. ,refrigerator. The control load includes a cooling fan and a damper,
The refrigerator according to claim 1 or 2, wherein the power shut-off process stops the cooling fan and closes the damper. The control load includes a compressor,
The refrigerator according to claim 1 or 2, wherein the power shut-off process stops the compressor and opens a pressure valve of a refrigeration circuit connected to the compressor.   The refrigerator according to claim 1 or 2, wherein the power-off process is a process of writing a state of the refrigerator in a storage device.   The refrigerator according to claim 1 or 2, wherein the restart process is a process of writing the state of the refrigerator stored in a storage device during the power-off process to the control circuit.

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