JP2008275205A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator capable of opening a plurality of doors while simplifying a circuit constitution relating to a PWM signal, and reducing costs. <P>SOLUTION: This refrigerator comprises a main control portion 114 outputting a specific signal indicating a left door on the basis of a door opening signal from a left door opening switch 27a, and the PWM signal having a duty ratio corresponding to the door opening force, a selecting circuit for selecting a path of a left solenoid 37a corresponing to the left door on the basis of the specific signal, and FET outputting a driving signal to the left solenoid on the basis of the PWM signal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a refrigerator having a plurality of doors.

  In recent years, refrigerators have a tendency to increase the amount of storage along with the diversification of eating habits, and in particular, in household refrigerators, the class in which the storage internal volume exceeds 400 liters has become mainstream, and the height and width dimensions of the refrigerator body tend to increase. It is in.

  Along with this, the doors of refrigerator compartments, freezer compartments and vegetable compartments have also become larger, and the storage pockets inside refrigerator doors, especially those with large storage volumes, have increased depth and dimensions as the height and width are increased. There is a tendency to store large amount of food, and the door itself becomes large, so a large force is required to open the door, and there is a problem that the burden is increased in the case of a weak woman or an elderly person.

  Therefore, a refrigerator including an electromagnetic solenoid-type door opening device that opens a door by pressing a door surface by pressing a door surface by a user's handle switch operation is provided (see, for example, Patent Document 1). .

  FIG. 12 shows a conventional control block diagram of the refrigerator having the door opening device as described above.

  The outputs of the door opening switches 204 and 206 for the left and right doors of the double door opening type are input to the main control unit 200. In FIG. 11, for example, when the change is made from H to L, it is determined that the switch has been pressed.

  The 5V DC power supply of the main control unit 200 uses a secondary DC voltage generated by the isolated switching power supply 202 from the high-voltage primary DC voltage converted from the commercial power supply 201, and the high-voltage primary side and Is electrically insulated. In this case, the door opening switches 204, 206 and the like that are touched by a person are insulated from the primary side in consideration of safety.

When the main control unit 200 detects that the door opening switches 204 and 206 are pressed, the FET 1 or FET 2 is driven via the insulating circuit Q1 or insulating circuit Q2 made of a photocoupler, and the electromagnetic solenoid 208 or electromagnetic solenoid of each door is driven. 210 is operated. Then, as described above, the pressing member protrudes by these electromagnetic solenoids 208 and 210 and the door is opened.
JP 2005-214490 A

  In the refrigerator having the double doors, it is necessary to adjust the DC voltage applied to the electromagnetic solenoid 208 when the door on one side is opened or closed. This is because if the door on one side is open, the door opening force may be smaller than that in the closed state, and if the same voltage as that in the closed state is applied to the electromagnetic solenoid 208, the door may open vigorously. Therefore, it is necessary to adjust the voltages to the electromagnetic solenoids 208 and 210 in two stages by the PWM signal.

  In the control block diagram of FIG. 12, the microcomputer constituting the main control unit 200 must use a dedicated terminal for outputting two PWM signals. For example, many other auxiliary devices are mounted. In some cases, these terminals are insufficient, and it is necessary to take measures such as using an element dedicated to PWM control in the main control unit 200.

  The frequency of the PWM signal is preferably 16 kHz or more exceeding the audible frequency range. However, high-speed FETs that drive by outputting high-frequency PWM signals and high-speed photocouplers are expensive.

  Also, even if multiple doors are equipped with door opening devices, in order to protect the power supply unit, the door opening devices are driven simultaneously to operate one by one. There is no waste.

  Further, in the control block diagram as described above, since it is necessary to perform wiring for high voltage on the control board 208, an increase in the board area and an increase in cost are incurred.

  Therefore, in view of the above problems, the present invention provides a refrigerator capable of opening a plurality of doors by simplifying a circuit configuration related to a PWM signal, suppressing cost.

  The present invention includes a refrigerator having a plurality of doors, an opening switch provided in each of the doors, and a plurality of opening driving units provided in each of the doors to bring the doors into an open state. And outputting a specific signal indicating a door designated as opening based on a door opening signal from each door opening switch and a PWM signal having a duty ratio corresponding to the door opening force of the designated door. Based on a control circuit, a selection circuit that selects one door driving drive unit corresponding to the designated door from the plurality of door opening driving units based on the specific signal, and on the basis of the PWM signal, And a drive circuit that outputs a drive signal to the selected door opening drive unit.

  Further, the present invention includes a plurality of doors, an opening switch provided for each of the doors, and a plurality of opening driving units provided for the doors to bring the doors into an open state. In each of the refrigerators, each door belongs to one group among a plurality of first groups divided by the first classification, and the plurality of doors are divided by a second classification different from the first classification. Each door belongs to one group in the second group, and one door is specified by specifying one group in the first group and one group in the second group. (1) a specific signal indicating one group of the first group including a door designated to be opened based on a door opening signal from each door opening switch; and (2) the specified Corresponding to the door opening force A control circuit for outputting a PWM signal having a duty ratio to one of the second groups including the designated door, and a door opening drive corresponding to the designated door based on the specific signal Based on the PWM signal, a selection circuit that selects one of the first groups including the unit, and outputs a drive signal to one of the second groups including the designated door And a drive circuit.

  According to the present invention, the circuit configuration relating to the PWM signal can be simplified, and the cost can be kept low.

  Below, the refrigerator of embodiment of this invention is demonstrated.

(First embodiment)
The refrigerator of 1st Embodiment is demonstrated based on FIGS.

(1) Structure of refrigerator The structure of the refrigerator of this embodiment is demonstrated based on FIGS.

  FIG. 2 is a perspective view showing the refrigerator of this embodiment, and FIG. 3 shows a state where the refrigerator of FIG. 2 is opened. 2 and 3, in the refrigerator main body 1 configured as a heat insulating box having a well-known structure, there are a refrigeration room 2, a vegetable room 3, an ice making room 4, a switching room 5 in which the internal temperature can be switched in a plurality of stages, The freezing room 6 is provided in order from the top, and the ice making room 4 and the switching room 5 are arranged side by side.

  The front opening of the refrigerator compartment 2 is provided with a left door 20a and a right door 20b constituting so-called double doors that are pivotally supported at both left and right ends, and the vegetable compartment 3, the ice making compartment 4, the switching compartment 5, and the freezer compartment Each front face of 6 is provided with drawer-type doors 3a, 4a, 5a and 6a connected to respective storage containers (not shown).

  Magnet gaskets 21a and 21b are attached to the peripheral portions on the back side of the left and right doors 20a and 20b. The left and right doors 20a and 20b are attracted to the flange portion 1a of the refrigerator main body 1 by the magnet gaskets 21a and 21b. It is configured to be held in a closed state. Although not shown, magnet gaskets are also attached to the peripheral portions on the back side of the other doors 3a, 4a, 5a and 6a.

  A pair of upper and lower bead portions 22a are formed on the inner circumference of the magnet gaskets 21a and 21b, respectively. The bead portions 22a are provided with storage pockets 23a and 23b for storing food.

  The bead portion 22a of the left door 20a facing the right door 20b is provided with a rotating partition plate 25 that closes the gap between the left and right doors 20a and 20b when the door is closed. The pressing member 1b provided on the inside of the rotary partition plate 25 is rotated by sliding in a groove formed on the upper surface of the rotary partition plate 25 according to the opening / closing operation of the left door 20a.

  A left door switch 27a and a right door switch 27b are attached to the front surfaces of the left and right doors 20a and 20b. When the left door switch 27a is pressed, a left door signal for opening the left door 20a is output. When the right door switch 27b is pressed, a right door signal for opening the right door 20b is output. An operation unit 28 for adjusting the temperature of the storage room is provided on the front surface of the right door 20b.

  As shown in FIG. 6 which is a top view showing the refrigerator 1 when the left door 20a is opened, door detection switches for detecting the open / closed states of the left and right doors 20a and 20b are provided on the left and right side walls of the refrigerator compartment 2, respectively. 26a and 26b are provided. When the button 26 'is pressed by the bead portion 22a, the door detection switches 26a and 26b assume that the doors 20a and 20b are closed and output a closing signal (OFF state), and the doors 20a and 20b are opened. As the button is pressed, the button is gradually released, and when the button protrudes to some extent by the spring force, it is assumed that the doors 20a and 20b are opened, and a door opening signal is output ( ON state).

(2) Door opening device 30
An opening device 30 that opens the left door 20a and the right door 20b of the refrigerator compartment 2 independently of each other is attached to the ceiling of the refrigerator body 1. The opening device 30 includes a left opening device 31 and a right opening device. A door device 32 is also provided.

(2-1) Left opening device 31
The left door device 31 will be described below.

  As shown in FIG. 6 which shows the cross-sectional structure of the upper part of the refrigerator 1, it is installed in a semi-embedded state in a recess 1 c formed in the ceiling part of the refrigerator body 1 and is driven in a case 33 made of synthetic resin. A left electromagnetic solenoid 34a that is DC-driven as a source is housed.

  The left electromagnetic solenoid 34a includes a coil unit 35 in which a coil formed in a cylindrical shape is resin-molded, and a plunger 36 made of a magnetic material provided in the unit so as to be movable in the axial direction while penetrating the coil unit 35. The main component is a pressing member 37 made of a non-magnetic metal fixed coaxially to the plunger 36. When the coil of the coil unit 35 is energized (hereinafter referred to as an energized state) The jar 36 and the pressing member 37 are urged toward the door 20a.

  A flange 36a made of, for example, a C-ring is provided at the rear part of the plunger 36 to prevent it from coming off, and an extension force acts between the flange 34a and the coil unit 35 around the plunger 36. A retracting spring 38 made of a compression coil spring is provided.

  With the configuration described above, when the left electromagnetic solenoid 34a is energized, the pressing member 37 protrudes forward to press the left door 20a and automatically opens. The spring 38 is returned to the initial position by the spring force.

(2-2) Right door opening device 32
The right door device 32 has the same configuration as the left door device 31 and will not be described. However, when the right electromagnetic solenoid 34b of the right door device 32 is energized, the right door 20b is automatically opened. To do.

  As shown in FIG. 5, the right door device 32 is installed closer to the hinge than the left door device 31. This is because the rotating partition plate 25 is provided on the left door 20a. This is because the force required at the time is higher than that of the right door 20b, and the opening speed of the left and right doors 20a and 20b can be made substantially uniform by reducing the pressing force of the right door device 32. When the arrangement positions of the right door device 32 and the left door device 31 are made symmetrical from the center, the pressing force is varied according to the energization time and the supply voltage, and the pressing force of the left door device 31 is changed to the right side. By making it stronger, the opening speed of the left and right doors 20a, 20b can be made substantially uniform. Moreover, in the form from which the magnitude | sizes of the right-and-left doors 20a and 20b differ, it is preferable to change an arrangement | positioning place and pressing force suitably.

(3) Control device 50
Next, the control apparatus 50 of the refrigerator of this embodiment is demonstrated with reference to FIG. 1 which is a control block diagram.

  The upper circuit diagram in FIG. 1 is a compressor drive circuit 102 for driving the compressor motor 100, and the lower circuit diagram is a door opening control circuit for opening the left and right doors 20a and 20b of the double door type. 104. Hereinafter, the circuits 102 and 104 will be described in order.

(3-1) Compressor drive circuit 102
First, the compressor drive circuit 102 will be described with reference to FIG.

  The compressor motor 100 is turned on / off and its rotational speed is controlled by an inverter circuit 106, and a sub-control unit 108 for controlling the inverter circuit 106 by a PWM signal is provided.

  In order to drive the inverter circuit 106, a high-voltage DC power source is generated from a 100 V commercial AC power source 101. For this generation, a voltage doubler rectifier circuit 110 is provided.

  The DC voltage system is divided into a high-voltage primary side and a low-voltage secondary side, and a DC power source from the voltage doubler rectifier circuit 110 described above is used as the primary high-voltage DC voltage. Insulated switching power supply 112 is used to generate a low-voltage DC voltage on the secondary side. That is, the high-voltage direct current is applied to the primary side of the insulated switching power supply 112, and the low-voltage direct current associated therewith is obtained on the secondary side. The sub-control unit 108 obtains low-voltage direct current from the insulating switching power supply 112.

(3-2) Configuration of the Door Opening Control Circuit 104 A main control unit 114 for controlling the door opening is provided on the secondary side of the switching power supply 112. The main control unit 114 is constituted by a microcomputer, and the left opening switch 27a and the right opening switch 27b described above are connected to the input side thereof. When the door opening signals from the left door switch 27a and the right door switch 27b are input, the main control unit 114 determines the PWM duty ratio, and the PWM signal P1 based on the PWM duty ratio and which door The door specifying signal P2 indicating whether has opened is output.

  The PWM signal P1 is transmitted to the primary side via an insulating circuit Q1 made of a photocoupler, and the door specifying signal P2 is transmitted to the primary side via an insulating circuit Q2 made of a photocoupler. Here, the insulation circuit Q1 is a so-called high-speed photocoupler and has a response speed of 5 kHz or more, and the insulation circuit Q2 is a so-called low-speed photocoupler and has a response speed of less than 5 kHz.

  The main control unit 114 can communicate with the sub-control unit 108 via the photocoupler Q3.

  On the output side of the insulating circuit Q1 and the insulating circuit Q2, a left driver circuit 116 for driving the left electromagnetic solenoid 34a for opening the left door 20a and a right electromagnetic solenoid 34b for opening the right door 20b are driven. A right driver circuit 118 is provided. The left electromagnetic solenoid 34a and the right electromagnetic solenoid 34b are driven by a primary high-voltage DC power supply. Similarly, the left driver circuit 116 and the right driver circuit 118 are driven by a primary high-voltage DC power supply. Hereinafter, the left and right driver circuits 116 and 118 will be described.

  A transistor Tr1 is provided to allow a direct current to flow through the left electromagnetic solenoid 34a. The emitter terminal of the transistor Tr1 is connected to the positive side of the high-voltage DC power supply via a diode D connected in the forward direction. An FET 1 is connected in parallel with the diode D. The base terminal of the transistor Tr1 is connected to the output of the insulation circuit Q2. The output of the insulation circuit Q1 is connected to the gate terminal of the FET1.

  A transistor Tr2 is provided to flow a high-voltage direct current to the right electromagnetic solenoid 34b. The diode D and FET1 are connected to the emitter terminal of the transistor Tr2. The output of the insulating circuit Q2 is connected to the base terminal of the transistor Tr2 via the NOT circuit 120. The NOT circuit 120 has a circuit configuration in which one of the transistors Tr1 and Tr2 is turned on and the other is always turned off.

  As shown in FIG. 1, components other than the inverter circuit 106 and the compressor motor 100 are arranged on one control board 122.

(3-3) Operation of the Door Opening Control Circuit 104 Next, the operation of the door opening control circuit 104 will be described.

  When the main control unit 114 first outputs the door specifying signal P2 via the insulation circuit Q2, the transistor Tr2 is turned off and only the transistor Tr1 is turned on. . That is, the operation of the transistor Tr2 is prohibited. The PWM signal P1 is output from the main controller 114 two milliseconds after the door specifying signal P2 is output. The duty ratio of the PWM signal P1 will be described later.

  When a PWM signal is input from the insulation circuit Q1, the FET 1 turns on / off the transistor Tr1 according to the PWM signal, and drives the left electromagnetic solenoid 34a.

(4) Determination Method of Duty Ratio of PWM Signal Next, a determination method of the duty ratio of the PWM signal output from the main control unit 114 will be described.

  The duty ratio of the PWM signal P1 adjusts the pushing force of the left and right solenoids 34a and 34b by changing the ON time (pulse width) of the FET1 by PWM control. There are two types of duty ratio of the PWM signal.

  The first duty ratio is a state in which the left door 26a or the right door 26b is opened with a normal opening force, and this duty ratio is determined in advance by experiments or the like and stored in the main control unit 114.

  The second duty ratio is set to open with a door opening force weaker than the door opening force determined by the PWM signal having the first duty ratio. For example, when the operation is performed with the left door 26a being opened, the right door 26b needs to be opened in a weaker state than when both the doors 26a and 26b are not opened. The duty ratio of the PWM signal is determined so that the force is weakened. This second duty ratio is also determined in advance by experiments or the like and stored in the main control unit 114.

  As described above, two types of duty ratios are stored in the main control unit 114 in advance, and the left and right doors 20a and 20b are opened with both strong opening force and weak opening force depending on the operation state of the opening switches 27a and 27b. Can be.

(5) Effect In the refrigerator having the above-described configuration, it is only necessary to secure one terminal for the PWM signal output from the main control unit 114.

  Since only one isolation circuit Q1 through which a high-speed PWM signal flows and only one FET 1 operates, the door opening control circuit 104 operates, so that parts can be reduced and the cost can be reduced.

  Wiring through which a high-speed PWM signal flows can be reduced in the control board 122, and cost can be reduced.

(Second Embodiment)
Next, the refrigerator of 2nd Embodiment is demonstrated based on FIG.7 and FIG.8.

(1) Structure of Refrigerator The refrigerator of this embodiment is replaced with the double doors left and right doors of the first embodiment, and as shown in FIG. 124 is provided. The door opening device 30 is provided on the rotary door 124 and the drawer-type door 3 a of the vegetable compartment 3. When opening the door 124, the door opening switch 27a on the left side of the door 124 is operated, and when opening the door 3a of the vegetable compartment 3, the door opening switch 27b is operated.

(2) Concept of door opening When the door opening device 30 is provided in the refrigerator as described above, it is necessary to change the reaction speed when opening the door 124 and the door 3a. The reason for this is that when the user opens the door 124 in front of the refrigerator, it is easy to avoid contact between the user and the door 124, so a quick reaction speed is required. On the other hand, if the drawer-type door 3a is opened as it is, there is a possibility of contact with the user. Therefore, it is necessary to slow down the reaction speed.

  Therefore, the door opening control circuit 104 of the door opening device 30 performs control so that the reaction speed is different. When the door opening switch 27a is operated, the reaction speed is increased, and when the door opening switch 27b is operated, the reaction speed is decreased. For this reason, the main control unit 114 performs control separately from the priority side door opening control and the non-priority side door opening control. The priority side is when the door opening switch 27a is operated, and the non-priority side is when the door opening switch 27b is operated. Then, the main control unit 114 has a structure that can immediately output the priority side door specifying signal. When the non-priority side door opening switch 27b is input, the main control unit 114 switches the state to the non-priority side. That is, this switching time appears in the difference in reaction rate.

(3) Control Method Hereinafter, this control method will be described based on the flowchart of FIG.

  In step 1, it is determined whether or not the main control unit 114 is in operation. If it is in operation, step 1 is continued until the operation is completed, and if the operation is completed, the process proceeds to step 2.

  In step 2, it is determined whether the priority door is a command to open or a non-priority door is to be opened. If the command is a priority command, the process proceeds to step 3;

  In step 3, since it is a command to open the door 124 on the priority side, the main control unit 114 is operated to open the door 124 as in the first embodiment. And it ends.

  In step 4, since the non-priority side door 3 a is instructed to open, the main control unit 114 switches the circuit in the main control unit (microcomputer) 114 so that the non-priority side door identification signal is output, Proceed to step 5. This switching time requires a predetermined time.

  In step 5, the main control unit 114 is operated as in the first embodiment, and the door 3a is opened.

  In step 6, the main control unit 114 switches from the non-priority side door identification signal to the priority side door identification signal and ends.

(4) Effect In the present embodiment, since the priority door identification signal is output in advance in the main control unit 114, a difference in reaction speed corresponding to the switching time can be obtained.

(5) Modification Example Before opening the non-priority side door 3a in this embodiment, a notification signal indicating that the door 3a is opened by sound or light may be output.

(Third embodiment)
Next, the refrigerator of 3rd Embodiment is demonstrated based on FIG.9 and FIG.10.

  The refrigerator of this embodiment is a case where the door opening device 30 is provided on the door 3a of the vegetable compartment 3 and the door 6a of the freezer compartment 6 in addition to the double doors left and right doors 20a, 20b of the first embodiment. is there. An opening switch 27c is attached to the door 3a, and an opening switch 27d is attached to the door 6a.

  Also in this door opening control, as in the second embodiment, when the left and right doors 20a and 20b are opened, the reaction speed is increased, and when the drawer type doors 3a and 6a are opened, the reaction speed is decreased. .

(1) Configuration of Door Opening Control Circuit 104 The door opening control circuit 104 of this embodiment will be described based on FIG. The difference between this embodiment and the first embodiment is as follows.

  Two FETs that output based on the PWM signal are provided, and the PWM signal is output from the main control unit 114 via the insulation circuit Q4 in order to drive the second FET 2.

  A third electromagnetic solenoid 126 for opening the door 3a, a fourth electromagnetic solenoid 128 for opening the door 6a, a third driver circuit for driving the third electromagnetic solenoid 126, and a fourth A fourth driver circuit 132 for driving the electromagnetic solenoid 128 is provided.

  The third driver circuit 130 is provided with a transistor Tr3 that supplies a direct current to the third electromagnetic solenoid 126, and the fourth driver circuit 132 is similarly provided with a transistor Tr4.

  The two third driver circuits 130 and the fourth driver circuit 132 have the same configuration as the left driver circuit 116 and the right driver circuit 118, and a PWM signal is supplied from the FET2.

  A door specifying signal is input to the base terminals of the transistors Tr3 and Tr4 via the insulation circuit Q2. However, like the left driver circuit 116 and the right driver circuit 118, the transistor Tr3 and the transistor Tr4 are not turned on at the same time, so that the door specifying signal via the NOT circuit 134 is input to the transistor Tr3 and the door specifying signal not via the NOT circuit 134. Is input to the transistor Tr4.

(2) Grouping The reason why the circuit configuration as described above is performed in the present embodiment is to control the four doors by classifying them into the first classification and the second classification. The grouping based on the classification will be described.

(2-1) How to divide the first group in the first classification In the 1-1 group, the left door and the right door of the double doors connected to the FET 1 belong.

  In the first-second group, two pull-out doors connected to the FET 2 belong.

(2-2) How to divide the second group in the second classification In the 2-1 group, the left door of the double door and the door of the vegetable room of the pull-out door belong.

  In the 2-2nd group, the right door of the double door and the freezer door of the drawer door belong.

(3) Door Opening Control Next, door opening control of the four doors grouped as described above will be described based on the flowchart of FIG.

  In step 1, it is determined whether or not the main control unit 114 is controlling the opening of the door, and the state of step 1 is continued until the control is completed.

  In step 2, it is determined whether the operated opening switch belongs to FET1 or FET2. If it belongs to FET1, the process proceeds to step 3, and if it belongs to FET2, the process proceeds to step 4. For example, when the left door switch 27a is operated, the process proceeds to Step 3 because it belongs to the FET1 side.

  In step 3, a door specifying signal indicating which door to open among the doors belonging to FET1 is set. For example, when the left door 27a is opened, an H door specifying signal is set, and when the right door 27b is opened, the door specifying signal is set to L.

  In step 4, a door specifying signal for specifying the door 3a or 3b is set.

  In step 5, it is determined whether or not the priority door is driven. That is, when the left and right doors 20a and 20b are opened, the process proceeds to step 6 assuming that the door is the priority side, and when the drawer type doors 3a and 6a are opened, the process proceeds to step 7 assuming that the doors are non-priority.

  In Step 6, since the door on the priority side is opened, the PWM signal is output to operate the FET 1, and the door specifying signal is output to open the target door. And it ends.

  In step 7, since the open state of the non-priority side door is commanded, the output of the main control unit 114 is switched from the priority side to the non-priority side. This switching time becomes a difference in reaction rate.

  In step 8, the FET 2 is operated, a door specifying signal is output, and the drawer-type door 3a or door 6a is opened.

  In step 9, the main control unit 114 switches the output to the priority side and ends.

(4) Effect Since the refrigerator according to the present embodiment is configured to open four doors, there are only two paths through which high-speed PWM signals are output, and there are also two FETs. , Can reduce the cost.

  Further, the number of terminals for outputting the PWM signal of the main control unit 114 which is a microcomputer may be two.

  Further, as in the second embodiment, the reaction speed of the door with high priority can be increased, and the reaction speed of the non-priority side door that is not so can be decreased.

(5) Modification In the above embodiment, four doors are divided into two groups and controlled. However, the present invention is not limited to this, and five or more doors can be divided into two groups and similarly controlled.

(Fourth embodiment)
The refrigerator of 4th Embodiment is demonstrated based on FIG.

  The difference between this embodiment and the first embodiment is that a door specifying signal is output to the sub-control unit 108 via the insulating circuit Q3, and the sub-control unit 108 outputs the transistor Tr1 or the transistor Tr2.

  In the present embodiment, the insulating circuit Q2 in the first embodiment can be omitted.

  In the refrigerator of the present embodiment, when the communication speed between the main control unit 114 and the sub control unit 108 is sufficiently high, or even if the communication speed is low, one of the door opening devices is not used as in the second embodiment. It is suitable when the reaction rate is slow.

(Example of change)
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist thereof.

  In the above embodiment, the electromagnetic solenoid is used as the opening drive unit for opening the door, but the door may be opened by a motor instead. In this case, the door opening force is controlled by controlling the torque and rotation speed of the motor with a PWM signal.

  Moreover, although it used for the refrigerator of the double doors provided with the rotation partition plate 25 in the said embodiment, it is applicable also to the refrigerator of the double doors which do not have the rotation partition plate 25.

It is a control block diagram of the 1st embodiment of the present invention. It is a perspective view which shows the refrigerator of 1st Embodiment. It is a perspective view which shows the state opened. It is a top view which shows the refrigerator at the time of opening a left door. It is a top view which shows a refrigerator at the time when an opening switch is operated simultaneously. It is a longitudinal cross-sectional view which shows a door opening apparatus. It is a front view which shows the refrigerator of 2nd Embodiment. It is a timing chart of control of a 2nd embodiment. It is a control block diagram of the 3rd embodiment of the present invention. It is a timing chart of control of a 3rd embodiment. It is a control block diagram of the 4th embodiment of the present invention. It is a conventional control block diagram.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator main body 20a Left door 20b Right door 27a Left door switch 27b Right door switch 30 Door opening device 31 Left door opening device 32 Right door opening device 34 Electromagnetic solenoid 50 Controller 104 Door opening control circuit 108 Sub control part 114 Main Control unit 116 Left driver circuit 118 Right driver circuit 120 NOT circuit 122 Control circuit

Claims (8)

Multiple doors,
An opening switch provided for each door;
A plurality of door opening drive units provided in each of the doors to bring the doors into an open state;
In a refrigerator having
A control circuit that outputs a specific signal indicating a door designated as opening based on a door opening signal from each door opening switch and a PWM signal having a duty ratio corresponding to the door opening force of the designated door When,
Based on the specific signal, a selection circuit that selects one door opening driving unit corresponding to the designated door from the plurality of door opening driving units;
One drive circuit that outputs a drive signal to the selected door opening drive unit based on the PWM signal;
Refrigerator. Multiple doors,
An opening switch provided for each door;
A plurality of door opening drive units provided in each of the doors to bring the doors into an open state;
In a refrigerator having
Each door belongs to one group among a plurality of first groups obtained by dividing each door by a first classification, and a plurality of second groups divided by a second classification different from the first classification. Each door belongs to one group, and one door is specified by specifying one group in the first group and one group in the second group. ,
(1) a specific signal indicating one group of the first group including a door designated to be opened based on a door opening signal from each of the door opening switches; and (2) opening of the designated door. A control circuit for outputting a PWM signal having a duty ratio corresponding to a force to one of the second groups including the designated door;
Based on the specific signal, a selection circuit that selects one group among the first groups including the door opening driving unit corresponding to the designated door;
A drive circuit that outputs a drive signal to one of the second groups including the designated door based on the PWM signal;
Refrigerator. The selection circuit selects a door opening drive unit of a door with a high priority, or a group including the door opening drive unit in an initial state.
The refrigerator according to claim 1 or 2. The control circuit is driven by a low-voltage DC power supply,
The selection circuit and the opening drive circuit are driven by a high-voltage DC power source.
The refrigerator according to claim 1 or 2. An inverter control circuit that outputs a PWM signal to an inverter circuit that rotates a compressor motor of the refrigerator;
The control circuit outputs the door specifying signal to the selection circuit via the inverter control circuit.
The refrigerator according to claim 1 or 2. The plurality of doors are a double door left door and a right door provided in a front opening of a main body storage chamber of the refrigerator.
The refrigerator according to claim 1 or 2. The plurality of doors are one rotary door provided in the front opening of the first main body storage chamber of the refrigerator and a drawer type door of the second main body storage chamber.
The refrigerator according to claim 6. The door opening drive unit is an electromagnetic solenoid or a motor.
The refrigerator according to claim 1 or 2.

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