TWI274134B - Refrigerator - Google Patents

Abstract

The subject of the invention aims at providing a refrigerator that can stabilize the ejector force of the solenoid upon opening the door even if the DC power circuit of the DC brushless motor and the DC power circuit of the solenoid of the compressor are commonly used. The resolution of the invention is that provides the DC power circuit 28 converting the AC power input into DC power for output, the DC brushless motor 19 for driving the compressor with power supplied by the main circuit 29 of inverter, the door opening device 20 connected in a way supplied by DC output from the DC power circuit and the operation switch 21 used to supply power to the door opening device 20, and the control means 30 that proceeds the driving control of the door opening device 20 by the time set up for the operation of the operation switch 21 and the voltage detection means 40 for detecting the voltage outputted to the main circuit 29 of the inverter and the voltage outputted to the control means 30. The control means 30 alters the time set up for power supply to the door-opening device 20 in accordance with the voltage detection means 40.

Description

1274134 (1) 玖, invention description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator having an opening device that automatically opens a storage compartment by an operation of a switch. [Prior Art] In recent years, the refrigerator has a tendency to increase in size as the food and drink are diversified, especially in household refrigerators, in which the number of units exceeding 400 liters has become mainstream. The height or width dimension of the refrigerator body also tends to become larger. With this trend, the threshold of the refrigerating compartment or the freezing compartment and the vegetable compartment is also increased. In particular, the storage pocket inside the sill of the refrigerating compartment having a large storage compartment volume is increased in size as the height and width are enlarged. Large and accommodating the trend of more food, the threshold body is larger, and in order to open up, it requires a greater power 'the disadvantage of having a burden on a woman or a younger person with less strength. As a configuration of the above-mentioned shortcomings, in recent years, a refrigerator equipped with an electromagnetic solenoid type 扉 opening device which is opened by a user's manual switching operation to push the keeper from the main body side is used as a market, and evaluation is performed as a market. Goods that do not need to be burdened on the opening of the threshold. On the other hand, the operation of the refrigeration cycle is efficiently performed. The rectification smoothing β commercial AC power supply is converted into a DC power supply, and the inverter output is converted into an AC output of a predetermined frequency and given to drive the so-called anti-compressor. Phase control. -4- 1274134 95牟9·Month 4 Correction Supplement (2) Here, the control circuit of the conventional 扉 opening device and the inverter of the compressor will be described with reference to the block diagram of Fig. 8. The DC power supply circuit 1 〇i is converted into a DC voltage from the 100V AC input of the AC power supply 109, and is supplied to the inverter main circuit 1 〇 5 ^ 5; magnetic change ^ 1 〇 3 U air system 1 2 0 When the compressor DC brushless motor 1 0 6 is operated, the rotational drive is controlled in accordance with the position detection signal from the position detecting circuit 121 and by giving a drive signal to the inverter main circuit 1 〇5. Further, when the operation switch 丨2 2 is turned on, the control device 120 is to supply a DC voltage to the electromagnetic solenoid 103 °, and the driving power of the solenoid is large, and the smoothing capacitors 1 〇 4, 1 0 4 When the capacitance is insufficient, the driving voltage is increased when the electromagnetic solenoid 1 〇 3 is energized. Thus, the DC voltage supplied to the DC brushless motor 106 via the inverter main circuit 105 is rapidly lowered. Therefore, when the operation switch 1 2 2 is turned on, the control device 120 increases the drive signal (task) output to the inverter main circuit 105, by being supplied to the DC brushless motor 160. The DC voltage is set high, and it is configured to maintain the control state before energization regardless of the energization of the electromagnetic solenoid 103 (for example, Japanese Patent Laid-Open Publication No. 2002-27780, paragraphs [0018] to [0028], Fig. 1). However, in the above configuration, the number of revolutions of the DC brushless motor of the compressor is changed in accordance with the operating state of the refrigerator. Therefore, the DC voltage supplied to the electromagnetic solenoid is fluctuated inversely proportional to the number of revolutions, and the DC coil cannot be normally opened. For example, when driving a DC brushless motor with high rotation, when the operation switch is turned on, the DC voltage supplied to the electromagnetic solenoid will be reduced and will be reduced by -5 to 1274134 (3) 95. 9. Year 4 correction, charge The weakness of the power, resulting in inconvenience of being unable to open up. On the other hand, when the DC brushless motor is driven by low rotation, the DC power supplied to the electromagnetic solenoid will become higher, and the protruding force will need to be stronger. Therefore, the protruding sound of the locating pin pushing the sill surface becomes too large. , or the inconvenience of excessive opening of the power.

In order to solve such inconvenience, a dedicated rectifier circuit or a DC power supply circuit according to a voltage doubler circuit may be separately provided in the electromagnetic solenoid and the DC brushless motor, but this may increase the cost, and the component must additionally form a circuit. Therefore, there is a possibility that the wiring board becomes large. The present invention has been made in view of the above-mentioned shortcomings, and an object thereof is to provide a DC power supply circuit of a DC brushless motor sharing a compressor and a DC power supply circuit of an electromagnetic solenoid, and the electromagnetic solenoid can be stably opened. Outstanding refrigerator. SUMMARY OF THE INVENTION A refrigerator according to the present invention includes: a DC power supply circuit that converts an AC input into a DC output, and a DC power supply circuit that is formed by connecting a three-phase bridge to a switching element and that is derived from the DC power supply circuit. The DC output is an inverter main circuit that outputs as a three-phase AC output, and a DC brushless motor for driving the compressor supplied from the inverter main circuit, and is connected to provide a DC output from the DC power supply circuit.扉 an opening device, and an operation switch for energizing the opening device, and an operation of the operation switch by the switching element of the inverter main circuit giving a driving signal to perform rotation control of the DC brushless motor The time set for power-on -6 - 1274 lfl (4) The amendment to the Chinese version of the patent application No. 9212C39 was presented on November 13, 1995.

a control means for performing drive control of the 扉 open device, and a voltage detecting means for detecting a voltage output from the DC power supply circuit to the inverter main circuit and outputting the voltage to the control means; wherein the control means is adapted to The voltage detecting means energizes the predetermined time of the opening of the opening device.

Further, a refrigerator according to the present invention includes: a DC power supply circuit that converts an AC input into a DC output, and a DC power supply circuit that is connected to a switching element by a three-phase bridge, and uses a DC output from the DC power supply circuit as a DC output An inverter main circuit for outputting a three-phase AC output, and a DC brushless motor for driving the compressor supplied from the inverter main circuit, and connected to give a DC output from the DC power supply circuit, by Changing the on-time of the FET as a constant period, controlling the PWM control of the output power by a time ratio to drive the controlled open device, and operating the switch to be energized to the open device, and in the inverter main circuit The switching element applies a driving signal to perform the rotation control of the DC brushless motor, and outputs a PWM task of the ON time ratio of the FET by the operation of the operation switch, thereby performing control means for driving control of the opening device, and Detecting a voltage outputted from the DC power supply circuit to the inverter main circuit, and The voltage detecting means is output to the control means, and the control means changes the PWM task output to the 扉 opening means in response to the voltage detecting means. According to the above configuration, it is possible to provide a refrigerator which can stably maintain the protruding force of the electromagnetic solenoid when the DC power supply circuit of the DC brushless motor of the compressor and the DC power supply circuit of the electromagnetic solenoid are shared. (5) (5) 1274134 95·9·4 Correction Year and month supplement [Embodiment] Hereinafter, a first embodiment of the present invention will be described. As shown in Fig. 4, in the uppermost part of the refrigerator main body 1, two left and right refrigerating compartments 2, which are separated from each other in the middle and left, are disposed, and the lower part of the refrigerating compartment 2 is adjacent to the subcooling. In the ice making compartment 4 of the heat insulating compartment, the vegetable compartment 5 is placed below the refrigerating compartment 2, and the freezing compartment 6 is arranged by means of extraction. The refrigerator compartment 2 is capable of cooling control by introducing cold air generated by a cooler (not shown) provided on the back surface thereof into the room by a fan. A mechanical chamber (not shown) is provided on the back surface of the bottom surface of the main body 1, and a compressor 1 8 is disposed. The opening is divided in the width direction in the front opening portion of the refrigerating chamber 2, and the hinges provided on both sides of the main body are provided. The left and right sides 9 and 10 of the two door systems are opened and closed from the middle to the left and right. The magnet spacer 1 〇b is attached to the peripheral portion of the left side 9 and the right side 1 背面 on the back side, and a pin (not shown) provided on the upper side of the refrigerator is provided on the right side of the left side 9 A rotating partition plate that slides in conjunction with the opening and closing operation of the sill. Although not shown, the rotating partition plate can be rotated by 90 degrees when the left weir 9 is closed, and is closely adhered to the rotating partition plate by the respective magnet spacers 1 and b, and the intermediate portion of the refrigerating chamber 2 is interposed therebetween. Is kept in an occluded state. The handle portion 11 is attached to the front portion of the right cymbal 10 opposite to the left cymbal 9, and the operation switch 1 2 and the operation panel 13 -8 - 1274134 丨 (1) g (6) are attached to the front of the handle portion 1 1 The switch 12 is a mechanical switch that is provided with a normally open type micro switch or the like that is turned on when the touch panel 12 2 is pressed. Further, the operation switch 12 may be constituted by an optical switch or a magnetic switch using a photointerrupter. At the top of the refrigerator main body 1, a cymbal opening device 20 for applying a force in the opening direction to the right cymbal 10 is attached, and a DC-driven electromagnetic solenoid 21 is disposed inside. The electromagnetic solenoid 21 is a coil unit 2 1 a which is formed by resin molding a cylindrical shape as shown in Fig. 5, and is provided in a state in which the unit is penetrated in the coil unit 2 1 a. The plunger 2 1 b and the main component of the positioning pin 2 1 c coaxially fixed to the plunger 2 1 b are in the energized state of the electromagnetic solenoid 21 (energized to the coil unit 2 1 In the state of a turn of the a), the plunger 2 1 b and the positioning pin 2 1 c are pushed in the direction of the arrow A. The upper edge portion of the right turn 10 is integrally provided with the contact pin 2 1 . The receiving portion of the front end portion of the c is energized by the electromagnetic coil 2 1 and when the plunger 2 1 b and the positioning pin 2 1 c are protruded, the receiving member 1 Oc is pushed by the positioning pin 2 1 c. In order to prevent the right 扉1 〇 from resisting the adsorption force of the magnet spacer 1 〇b, the pressing force is opened. Hereinafter, the AC input of the drive circuit of the DC brushless motor 19 for driving the compressor 18 and the electromagnetic solenoid 21 of the 扉Open device 2〇 to the rectifier circuit 23 formed by the diode bridge will be described with reference to Fig. 1 . The terminal room 'is connected to the AC power source 2 5 via the reactor 24, and is in the straight -9- 1274134 V: q4 day f positive complement (7) the current device is reversed) Two current-flowing capacitors 2 6 27 connected in series are connected between the main output terminals of the main control. The one terminal of the reactor 24 to which the AC power supply 25 is not connected is a common connection point that is also connected to the smoothing capacitors 26 and 27, and constitutes a voltage doubler rectifier circuit 28 as a direct current power supply circuit. Between the output terminals of the voltage doubler rectifier circuit 28, that is, between the terminals of the series circuit of the smoothing capacitors 26 and 27, a DC voltage of about 8 4 〇 V which is twice the peak voltage of the AC power source 25 is output. An inverter main circuit 29 is connected between the output terminals of the voltage doubler rectifier circuit 28. The phaser main circuit 29 is a three-phase bridge connected to six transistors (constituting a switching element, which is connected to each phase terminal of the DC brushless motor 19. The inverter main circuit 2 9 The drive signal has a pw Μ signal given to the base of each transistor by the slave device 30. The control device 30 is composed of a ROM, a RAM, etc., which is mainly composed of a microcomputer, and is stored in advance to control the inverter master. The program of the circuit 29. When the inverter main circuit is driven, the position detecting signal from the position detecting circuit 31 for detecting the position of the rotor rotating position of the DC brushless motor 19 is referred to. 0 is a function as a control means in the present invention. Two resistors 41 and 42 are connected in series between the input terminals of the inverter main circuit 29, and are divided and input to the inverter circuit 29 via the capacitor 43. The DC voltage, which is input to the device 30, detects the input voltage fluctuation of the inverter main circuit 29, and constitutes the voltage detecting circuit 40. -10- 1274134 (8) Practical On, the electromagnetic solenoid 2 1 is If a power of about 2 Ο 0 W is required, one terminal of the electromagnetic solenoid 21 is connected to the positive output terminal of the voltage doubler rectifier circuit 28, and the other terminal is connected to the drain side of the driving FET 3 2 . Further, a diode 3 3 is connected in parallel to both terminals of the electromagnetic solenoid 21. The FET 3 2 is when the operation signal of the operation switch 12 is input to the control device 30, and the control device 30 is based on the voltage detection circuit. The input voltage of 40 determines the on-time of the FET 32 (the energization time of the electromagnetic coil 21), and is turned on according to the on-time (the control power is, for example, DC 15 V). Hereinafter, the specific description of the switch-driving FET 32 will be described. The terminal from the output side of the control device 30 is connected to the base side of the npn-type transistor 35 via a resistor 34, and the collector side of the first transistor 35 is connected via a resistor 36. The base side of the pnp-type second transistor 37 is connected to the source side of the FET 32. The emitter side of the second transistor 37 is connected to the third transistor 3 of the npn type. On the collector side of 9, while the control power is supplied, the collector side is The resistor 38 is connected to the source side of the FET 32. The emitter side of the third transistor 39 is connected to the emitter side of the pnp-type fourth transistor 40, and the collector side of the fourth transistor 40 is connected. On the source side of the FET 32. The respective base sides of the third and fourth transistors 39, 40 are connected to the collector side of the first transistor 35 via a resistor 38.

On the other hand, between the emitter of the third transistor 39 and the collector of the fourth transistor 40, is connected to the gate side of the FET 32 via the resistor 41, FET -11 - 1274134 丨, 9 A!t| Ο The source side of 32 is connected to the negative output terminal of the double voltage rectifying circuit 28, and the resistor 42 for quickly closing the process is provided in parallel between the source and the gate of the FET 32. In the above configuration, when a drive signal (on signal) is input from the control device 30, the first transistor 35 is turned on. Thus, a control voltage is supplied to the emitter side of the second transistor 37, thereby causing the second transistor 37 to be turned on, and current flowing between the collector and the emitter. Further, a current flows on the base side of the third transistor 39, thereby causing the third transistor 39 to be turned on, and the current flowing between the collector and the emitter causes the FET 32 to be turned on. On the other hand, when the drive signal (input off signal) from the control device 30 is broken, the first transistor 35 is turned off, and thus current is not supplied to the FET 32, but a capacitor is generally provided in the FET 32. And will leave a charge. However, this electric charge flows into the collector, the emitter, and the emitter of the fourth transistor via the resistor 41, so that the charge can be quickly pulled out when the electrode is turned off, and the time required for the shutdown can be shortened. Hereinafter, the action of this embodiment will be described. The DC power supply circuit 2 8 is rectified from the 100 V AC input of the AC power source 25, and is boosted by a voltage across the equalizing capacitors 26, 27 to output a DC voltage of approximately 280 volts. This DC output is supplied to the inverter main circuit 29 and the drive circuit side of the electromagnetic solenoid 2 1 . The control device 30 applies a drive signal corresponding to the drive frequency to the inverter main circuit 2, 直流 in the DC brushless operation when the compressor 18 is operated, by the position detection signal from the position detecting circuit 31. The motor 19 applies a three-phase AC voltage for rotational drive control. In the state in which the DC brushless motor 19 is driven to operate the compressor 18, -12-(10) 1274134%9·η (corrected 莼月曰 added, when the operation switch 12 is turned on, the control device 30 becomes This operation is detected to output the on-signal for a predetermined time (e.g., 0.5 second) to the transistor 36 and to turn on the FET 32, whereby the DC output from the voltage doubler rectifier circuit 28 is supplied to the electromagnetic solenoid 21.

At this time, since the driving power of the electromagnetic solenoid 21 is large, the DC voltage supplied to the inverter main circuit 29 is rapidly lowered, and the compressor 18 is tuned, and vibration is generated to cause an inconvenience such as an abnormal sound. Therefore, when the operation switch 12 is turned on, the PWM action is changed to be high, and the voltage drop component in the energization of the electromagnetic solenoid 21 is preferably ideal. In the following, referring to Fig. 6 showing the result of a comparative experiment by the applicant of the present invention, a DC power supply circuit 28 for supplying a DC voltage to the electromagnetic solenoid 21 and the DC brushless motor 19 is shared as an embodiment of the present invention. The configuration (hereinafter referred to as the configuration of the present embodiment) and the DC voltage fluctuation of the electromagnetic solenoid 2 1 supplied to the DC power supply circuit (hereinafter referred to as a conventional configuration).

The commercial AC voltage is usually 100 V, and the use condition of other electric products and the like is changed. At this time, the DC voltage input to the inverter main circuit 29 also fluctuates, and therefore, the change is assumed by the applicant. Change the commercial voltage to a DC voltage variation of 90 V, 100 V, and 1 10 V. Further, the rotation control of the DC brushless motor 19 changes the rotation frequency in accordance with the temperature change of the refrigerator 1. However, in this case, the DC voltage input to the inverter main circuit 29 varies, and the applicant is determined. The output of the DC brushless motor 19 will be 13- from the stop state of the compressor 18.

1274134 (11) The 0 V of the output power is changed to the DC voltage fluctuation of the 180 W output power of the highest speed.

As shown in Fig. 6, as a result of the experiment, in the case where the commercial AC voltage is assumed to be the most localized, the DC voltage is not changed in the state where the DC brushless motor 19 is stopped, and thus the result is 3 04 V (referred to herein as voltage A), but slowly increase the output of the brushless DC motor 19, the DC voltage is reduced according to the load applied to the compressor 18, and the maximum output of 180 W is reduced. Up to 2 6 3 W. Similarly, when the commercial AC voltage is changed to 100 V or 90 V, it is reduced from 276 V to 234 V and 248 V to 208 V. At this time, the voltage at the lowest DC voltage is used as the voltage B.

As a result of this, in the conventional configuration, the DC voltage supplied to the electromagnetic solenoid in accordance with the fluctuation of the DC brushless motor is not changed, and therefore only the fluctuation component of the commercial AC voltage is assumed: tl 〇 % (here The voltage fluctuation component C) may be designed. However, in the configuration of the present embodiment, a fluctuation component of the commercial AC voltage fluctuation component and the fluctuation component of the DC brushless motor 19 is generated by ±20% (here, voltage) Change component D). This fluctuation component is such that when the DC brushless motor 1 9 is driven at a high rotation (high output), the DC voltage supplied to the electromagnetic solenoid 21 is remarkably lowered, so that the protruding force is weakened, so that it is inconvenient to open. . On the other hand, when the DC brushless motor 1 9 is driven or stopped with low rotation (low output), the DC voltage supplied to the electromagnetic solenoid 21 becomes high, so that the protruding force becomes stronger than necessary, thereby causing positioning. It is inconvenient for the pin 2 1 c to push the bearing 1 〇c to become too large or more powerfully over-open. -14- (12) 1274134 95. 9. In addition, in the present invention, when the operation switch 丨2 is turned on, the control clothes are set to J 0 疋 regardless of the rotational variation of the DC brushless motor 19. The protruding force of the electromagnetic solenoid 2 is set to a predetermined value, and the energization time energized to the electromagnetic solenoid 21 is changed in accordance with the DC voltage input to the inverter main circuit 29. The method of changing the energization time will be described with reference to the flowchart of Fig. 2 .

In step 1, it is detected whether the operation switch 12 is turned on (s J ), and the process proceeds to step 2. In step 2, the voltage detection circuit 4 〇 detects that the input voltage fluctuation of the DC brushless motor j 9 and the fluctuation of the commercial AC voltage at the moment when the operation switch 12 is turned on is correctly input, and is input to the inverter. The DC voltage of the main circuit 29 (hereinafter referred to as a real voltage) (S2).

In step 3, the power-on time (S 3 ) is determined by the real voltage detected in step 5. The method of the energization time is obtained by Equation 1. This equation 1 refers to the voltage B when the DC voltage supplied to the electromagnetic solenoid 1 is the largest as shown in Fig. 7, and if the energization time is long, the protruding force becomes too strong. The power-on time is T 1 which is the minimum time. On the other hand, when the voltage A of the DC voltage supplied to the electromagnetic solenoid 21 is the smallest, the energizing time is short, and the protruding force is weakened. Therefore, the energization time in this case is T2 which is the maximum time. (Equation 1) Set the energization time = Τ1-(Τ1-Τ2)/(Voltage A-Voltage C)x (Real voltage-Voltage C) -15- (13) (13) 1274134 % 9·α 4 Revision year 曰The supplementary real voltage is varied within the range of the voltage Α Β 对于 according to the output fluctuation of the DC brushless motor 19, and thus the protrusion force can be made constant by the 通电 1 - T2 proportional variation energization time. .

In step 4, the FET 32 is turned on to energize the electromagnetic solenoid 21 (S4). Thereafter, in step 5, it is detected whether the time of energization to the electromagnetic solenoid 21 reaches the energization time determined in step 3 (S 5 ), and in step 6, if the predetermined time is reached, the FET 3 2 is turned off and ends. The energization 21 of the electromagnetic solenoid 2 1 (S6). According to this embodiment, when the operation switch 12 is turned on, the energization time for the electromagnetic solenoid 21 is changed in accordance with the input DC voltage of the inverter main circuit 29 detected by the voltage detecting circuit 40. Therefore, regardless of the rotation change of the DC brushless motor 19, the protruding force of the electromagnetic solenoid 21 can be made constant.

Therefore, it is possible to prevent the inconvenience that the protruding force is weakened according to the rotation fluctuation of the DC brushless motor 19, and the inability to open is prevented, or the protruding force becomes excessively strong, and the positioning pin 2 1 c is pressed. It is inconvenient to withstand a loud sound of 10 c, or to open excessively. Hereinafter, other embodiments will be described. The electromagnetic solenoid 21 is not a driver that is driven by the energization time as in the above-described embodiment, but changes the ON time (pulse width) of the FET 32 by a constant period, and controls the output power by a time ratio. Control is driven to control. The turn-on signal (P WM signal) of the FET 3 2 is performed at a frequency that the user does not hear, for example, 16 Hz. Also, the power-on time is made constant. The operation of this embodiment will be described based on the flowchart of Fig. 3. -16- 1274134 95 Car 9·Month 4曰Ιΐ Complement (14) In step 1 1, it is detected whether the operation switch 12 is turned on (s 1 1 ), and the process proceeds to step 12. In step 12, the voltage detecting circuit 40 detects that the input voltage fluctuation of the DC brushless motor 19 and the fluctuation of the commercial AC voltage at the moment when the operation switch 12 is turned on correctly is input to the inverter. The DC voltage of the main circuit 29 (hereinafter referred to as a real voltage) (S12). In step 13, the PWM action is determined by the real voltage detected in step 12 (S13). The PWM task is determined by determining the voltage B when the DC voltage supplied to the electromagnetic solenoid 21 is at a minimum as shown in Equation 2 (refer to FIG. 6) and turning on the FET 32 by the ratio with the real voltage. PWM task. At this time, the 100% PWM task is determined by the experiment, and when the DC voltage supplied to the electromagnetic solenoid 21 is the smallest, the PWM task at the time of generating the normal protruding force is made 1%. According to the above formula 2, when the real voltage fluctuates within the range of the voltage A - B, the PWM action is determined according to the variation ratio, and therefore the protruding force of the electromagnetic solenoid 21 is constant. (Formula 2) Setting PWM action = (voltage C / real voltage) xl 〇〇 % In step 14, the FET 32 is turned on to conduct the electromagnetic solenoid 21 (S14). Thereafter, in step 15, the energization time of the electromagnetic solenoid 21 is detected, and it is detected whether or not the energization time determined in step 3 is reached (S 15). In step 6, if the predetermined time is reached, the FET is turned off. 3 2 ends the energization of the electromagnetic solenoid 2 1 (S 16 ). According to the above configuration, the drive control of the electromagnetic solenoid 21 is controlled by -17-

1274134 (15) The PWM controller can also obtain the same effects as those of the above embodiment. In the above-described embodiment, the voltage doubler rectifier circuit 28 is used as the DC power supply circuit for generating 28 V, but the DC voltage of 2 8 Ο V may be formed by using the booster circuit, or The low voltage uses the constituents of the inverter main circuit.

Further, the DC brushless motor 19 is a case where the position detecting circuit 31 detects a voltage signal to detect the rotational position of the rotor, but it is also possible to directly detect the rotational position of the rotor. (Effect of the Invention) According to the configuration of the present invention, it is possible to provide a projecting force of the electromagnetic solenoid when the DC power supply circuit of the DC brushless motor sharing the compressor and the DC power supply circuit of the electromagnetic solenoid can be stably opened. refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a circuit diagram showing a control circuit according to an embodiment of the present invention. Fig. 2 is a flow chart showing the control method of Fig. 1. Fig. 3 is a flow chart showing another embodiment of the present invention. Fig. 4 is a longitudinal sectional view showing the refrigerator of the present invention. Fig. 5 is a longitudinal sectional view showing a detail of the electromagnetic solenoid of the present invention. Fig. 6 is a graph showing changes in DC voltage by the relationship between the output fluctuation of the brushless DC motor and the fluctuation of the commercial AC voltage. Fig. 7 is an explanatory view showing the energization time of Equation 1. -18-

1274134 (16) Fig. 8 is a circuit diagram showing a conventional control circuit. [Main component comparison table] 1 Refrigerator body 2 Refrigerator 10 Right 扉 10b Magnet gasket 10c Withstand 12 Operation switch 13 Operation panel 18 Compressor 19 DC brush motor 20 扉 Opening device 2 1 Electromagnetic screw 2 1c Locating pin 23 Rectifier circuit 25 AC power supply 28 DC power supply circuit 29 Inverter main circuit 30 Control device 32 FET 40 Voltage detection circuit

-19-

Claims (1)

1274134 Pickup, Patent Application No. 92 1 24239 Patent Application Revision of Chinese Patent Application Revision of the Republic of China 1955 1 January 13 Revision 1 · A refrigerator characterized by: having: converting AC input into straight: flow And outputting a DC power supply circuit (28), and an inverter main circuit (29) formed by connecting a three-phase bridge to the switching element and outputting the DC output from the DC power supply circuit as a three-phase AC output And a DC brushless motor (19) for driving the compressor supplied from the inverter main circuit, and a 扉 opening device (20) connected to the DC power supply circuit for supplying a DC output, and for energizing to The operation switch (1 2 ) of the opening device and the switching element of the inverter main circuit give a driving signal to perform rotation control of the DC brushless motor, and the operation time of the operation switch is energized for a predetermined time. a control means (30) for driving control of the 扉 open device, and detecting power output from the DC power supply circuit to the inverter main circuit And said control means outputs to the voltage detecting means (40); wherein the control means is changed in response to the voltage detecting means is energized to open the gates of the above-described predetermined time unit. 2. A refrigerator characterized by: a DC power supply circuit (28) that converts an AC input into a DC output and is formed by connecting a two-phase bridge to a switching element, and is derived from the DC power supply circuit The DC output is an inverter main circuit (29) outputted as a three-phase AC output, and a DC brushless motor (1 9 ) for driving the compressor supplied from the inverter main circuit, and connected to be given From the direct current input of the DC power supply circuit 1274134, the output of the FET (32) is changed by the cycle of the FET (32), and the PWM control of the output power is controlled by the time ratio to drive the controlled open device (20). And operating the switch (12) that is energized to the opening device, and the switching element of the inverter main circuit gives a driving signal to perform the rotation control of the DC brushless motor, and the operation output of the operation switch is used as the Control means (30) for driving control of the above-described 扉 open device by the PWM task of the on-time ratio of the FET, and detecting the DC power source from the above Path is output to the voltage of the inverter main circuit, and output to the voltage detecting means said control means (40); wherein the control means is changed in response to the voltage detecting means and the output-oriented of the PWM task said Fei open apparatus. 1274134 No. 24239, Wei Wei, the Chinese version of the amendment page, revised on September 4, 1995 Figure 1 750001 28 42 Γ 34 127413% of the patent application No. 92124239 Chinese map correction page Figure 8 November 13, 1995 101 At 120 1274134 柒, (1), the designated representative figure of this case is: Figure 1 (2), the representative symbol of the representative figure is a simple description: 12 Operation switch 18 Compressor 20 扉 Open device 23 Rectifier circuit 25 AC power supply 26 Capacitor 27 Capacitor 28 DC power supply circuit 29 Inverter main circuit 30 Control device 32 FET 33 Dipole 髀34 Resistor 35 Transistor 36 Resistor 37 Transistor 3 8 Resistor 39 Transistor 40 Voltage detection circuit 41 Resistor 42 Resistor 43 Capacitor 捌, if this case In the chemical formula, please reveal the chemical formula that best shows the characteristics of the invention: