JP4277762B2 - Refrigerator control device - Google Patents

Description

  The present invention relates to a refrigerator control device using a brushless DC motor as a compressor.

  Conventionally, the control technology in this kind of refrigerator compressor drives a compressor equipped with a three-phase motor having windings and permanent magnets with high efficiency, so that the current effective value for the torque generated from the motor is minimized. Thus, the copper loss of the winding is reduced (for example, see Patent Document 1).

  FIG. 8 shows a conventional refrigerator control device described in Patent Document 1. As shown in FIG. As shown in FIG. 8, the compressor 1 equipped with a three-phase electric motor having windings and permanent magnets is included, and the compressor 1 is connected to the compressor driving device 2. Further, a position detection means 3 is provided for detecting the position of the rotor of the compressor 1.

  The compressor driving device 2 has power supply means 4 for supplying a current having a waveform substantially similar to the no-load induced voltage waveform of the compressor 1 to the compressor 1. The power supply means 4 includes a switch unit 5 and a switch. It is composed of switch control means 6 for controlling conduction and non-passage of each element of the unit 5.

  The switch unit 5 is composed of six switch elements 7, 8, 9, 10, 11, and 12. The switch elements 7 and 8 are the U phase of the compressor 1, the switch elements 9 and 10 are the compressor V phase, The switch elements 11 and 12 are connected to the compressor W phase.

  In order to change the rotation speed of the compressor 1, for example, when a current is passed from the U phase to the V phase of the compressor 1, the switch elements 7 and 10 are turned on. By changing the energization rate (duty) during the carrier cycle, the effective value of the supply voltage to the compressor 1 is varied.

In the above configuration, the compressor 1 having a three-phase motor can be obtained by setting the electrical angle of each phase conduction section of the compressor 1 to 120 degrees, minimizing the effective value of the current with respect to the generated torque, and reducing copper loss. Driving with high efficiency. Furthermore, by setting the electrical angle of each phase energization section of the compressor 1 to be greater than 120 degrees and equal to or less than 145 degrees, torque pulsation due to current switching is reduced, and vibration and noise are reduced.
JP 2001-309683 A

  However, considering the actual use of the refrigerator, the refrigerator has extremely low door opening and closing time except for housework hours in the morning and night, and the internal temperature is very stable in the cooled state, so the compressor rotation speed is variable. Inverter-controlled refrigerators that can be operated at low speeds to save energy.

  However, since the conventional technology has a 120-degree energization configuration, it is necessary to design a motor that can produce a predetermined maximum number of rotations at a duty of 100%, reducing the number of winding turns and sacrificing motor efficiency. There was a need to do.

  Furthermore, in the conventional configuration, the door is frequently opened and closed especially in the summer, and the compressor 1 is operated at the maximum speed when the refrigerator internal temperature rises greatly or immediately after defrosting, and the internal temperature is set quickly. When the load of the compressor is heavy, such as when it is necessary to return to temperature, there is a problem that the maximum rotation is not reached.

  In addition, when the energization angle is 120 degrees to 145 degrees or less, the motor torque can be increased, but the inverter switching loss increases, leading to an increase in power consumption of the refrigerator. Furthermore, in the conventional overlapped energization, the commutation is delayed from the commutation timing of 120-degree energization, so the current phase is delayed from the induced voltage phase of the motor, and a loss due to an increase in current also occurs. Had.

  The present invention solves the above-described conventional problems, and when the refrigerator interior is in a cooled state, the compressor is driven with high efficiency to reduce the power consumption of the refrigerator and the interior temperature is reduced. When it is high, it aims at providing the control apparatus of the refrigerator which can accelerate | stimulate cooling in a warehouse by operating a compressor at high speed.

  In order to achieve the above object, the refrigerator control device of the present invention, when the switch element is energized, advances the turn-on timing of the switch section with respect to the position signal of the position detection means by 120 degrees. By driving the compressor with the above energization angle (overlap energization), a synergistic effect of the weak magnetic flux by the advance angle control and the increase of the output voltage by the wide angle energization can be obtained. It is possible to increase the torque of the compressor and increase the maximum rotational speed of the compressor.

  The refrigerator control device of the present invention can be operated in any operating state such as the load state and the rotational speed of the compressor, thereby realizing an optimal operation.

  Further, it can be widely used in compressors equipped with motors having different motor characteristics such as an embedded magnet type (IPM) motor and a surface magnet type (SPM) motor using reluctance torque.

  Furthermore, even when a motor with reduced motor torque is used, the compressor can be driven at a predetermined maximum rotation speed, so that the inside of the refrigerator can be kept without impairing the cooling performance (high-speed drive performance of the compressor). Cooling can be performed stably, and the power consumption of the refrigerator can be reduced.

In order to solve the above conventional problems, the invention of the refrigerator control device according to claim 1 of the present invention includes a compressor using a brushless DC motor, a power supply device that supplies power to the compressor, A position detection means for detecting a rotor position of the brushless DC motor, and the power supply device is a switch composed of six switch elements that are turned on or off according to a position signal obtained by the position detection means. And a position signal of the position detection means when the switch element is energized with respect to the position signal of the position detection means. Drive the compressor at an energization angle (overlap energization) of 120 degrees or more by advancing the timing at which the switch section is turned on with respect to the signal from the timing at which the switch is turned off. Thus, a synergistic effect of the field weakening by the advance angle control and the increase of the output voltage by the wide angle energization can be obtained, and the motor torque can be increased and the maximum number of revolutions of the compressor can be increased than when driven by 120 degree energization. It becomes possible. In addition, when the maximum number of rotations is determined in advance, it is possible to use a motor that is more efficient than a conventional motor that is used with 120-degree energization, and energy saving of the refrigerator can be achieved.
Further, the refrigerator control device of the present invention includes a rotation speed detection means for detecting a current rotation speed of the compressor, a power supply ratio detection means for detecting a current flow ratio of the current switch unit, and a target rotation for setting a target rotation speed. When the compressor is driven at 120 ° energization, the energization rate is 100% or the set maximum energization rate. However, when the target rotational speed is not reached, the on-timing for switching from the non-energized state to the energized state of the switch unit is advanced and the compressor is driven at an energization angle of 120 degrees or more. In a high environment, when the refrigerator door is opened and closed frequently, when the door is opened for a long time, or when food with high temperature is put in the warehouse, the temperature in the warehouse rises, that is, the load in the warehouse rises. However, the pressure is 120 ° Even when the machine rotation speed does not reach the maximum rotation, by applying the overlap current, the compressor can be driven at a rotation speed higher than the maximum rotation speed of 100% energization rate at 120 degrees energization, and the internal cooling rate Can provide a fast refrigerator.
In addition, the refrigerator control device of the present invention has an overlap angle addition / subtraction means, and when the compressor is driven at a conduction angle of 120 degrees, the conduction ratio reaches 100% or the set maximum duty. However, when the rotation speed of the compressor does not reach the target rotation speed, the overlap angle addition / subtraction means gradually increases the switch element energization angle by gradually increasing the ON timing of the switch element. The rotation speed is close to the target rotation speed, so that the compressor rotation speed does not reach the maximum rotation speed at 120 ° energization and 100% conduction angle, and the compressor is operated at the maximum rotation speed by overlap energization. Even when the overlap angle is added, the overlap angle is gradually increased by the overlap angle adding / subtracting means, so that more accurate rotation speed control is possible even during overlap control. Since the drive with the minimum overlap angle is performed, the increase in switching loss of the inverter due to the overlap energization can be minimized, and the increase in power consumption of the refrigerator can be minimized. It is what.
In the refrigerator control device of the present invention, when the compressor is driven with the switch element on-timing and the switch section is driven at an energization angle of 120 degrees or more, when the compressor rotation is decelerated, The on-timing is gradually delayed, and even when the energization angle reaches 120 degrees, the energization rate is lowered when the target rotational speed of the compressor has not been reached. When the speed is reduced to a low speed when operating at%, the overlap angle is gradually decreased first, and when the overlap angle reaches 0 degrees, that is, 120 degrees energization is performed. Even in such a case, if the rotational speed is higher than the set target rotational speed, the energization rate is lowered to approach the target rotational speed. This makes it possible to shorten the period for driving the compressor by overlap control as much as possible, shorten the energization period of the current flowing through the motor winding, suppress the motor winding temperature rise as much as possible, suppress the winding temperature rise, and the compressor It is characterized by realizing high-efficiency operation.

  The invention of the refrigerator control device according to claim 2 is the invention according to claim 1, wherein the timing when the switch element is changed from the non-energized state to the energized state is changed from the energized state to the non-energized state. It is performed earlier than the timing in the range of electrical angle from 0 degrees to 30 degrees, and the overlap angle can be determined in the range of electrical angle from 0 degrees to 30 degrees, so depending on the load condition of the refrigerator and the rotation speed of the compressor Thus, it is possible to provide an optimum overlap angle, and when the highly efficient operation is required or when the high speed operation is necessary, it is possible to realize the optimum compressor driving in accordance with the operation state of the refrigerator.

  In addition to the invention of claim 1 or 2, the invention of the refrigerator control device according to claim 3 is an on-timing control means for turning on each switch element of the switch unit, and turns off the switch element. An off-timing control means, both the on-timing and off-timing of the switch part are advanced with respect to the position signal of the position detecting means, and the on-timing of the switch element is made earlier than the off-timing, The drive angle of the element is set to an electrical angle of 120 degrees or more, and the compressor is driven. The switch element is switched from ON to OFF, and the switch element is switched from OFF to ON. By setting the timing earlier than the transition timing to off, it is possible to perform overlap energization and the motor The current phase can be advanced from the no-load induced voltage (advance control), and a compressor equipped with a high-efficiency motor using reluctance torque, such as an IPM motor, is optimally suited to the operating state of the refrigerator. Driving (high efficiency operation at low speed driving, high torque operation at high speed driving) is possible.

  The invention of the refrigerator control device according to claim 4 is the invention according to any one of claims 1 to 3, wherein the commutation timing of the energized phase of the compressor is determined by the position signal of the position detecting means. On the other hand, the sum of the electrical angle that advances the ON timing of the switch part and the electrical angle that advances the OFF timing is 60 degrees or less, and the electrical angle that advances the ON timing is greater than or equal to the electrical angle that advances the OFF timing. Since the advance angle and overlap control angle can be set in the range of electrical angle 0 to 30 degrees, the optimum advance angle and overlap angle depending on the load state of the refrigerator, the rotation speed and the rotation state of the compressor As a result, it is possible to optimally drive an IPM motor that needs to give an optimum advance angle depending on the load state and speed of the motor. As a result, an IPM motor, an SPM motor Since the control specification agnostic motor specifications can be realized, the compressor can be realized using a permanent magnet motor of various properties.

The invention of the refrigerator control device according to claim 5 is the invention according to claim 1 , wherein the compressor is driven at an energization angle of 120 degrees and does not reach an energization rate of 100% or a maximum energization rate. When accelerating the rotation of the compressor, first increase the power supply rate to bring the compressor speed close to the target speed, and when the power supply rate reaches 100% or the maximum power supply rate By increasing the ON timing of the switch element, the energization angle of the switch unit is increased, and the compressor speed is made closer to the target speed, and in order to drive at the target speed, Even when driving at an energization angle exceeding 120 degrees energization is required, the rotation speed can be controlled with high accuracy. As a result, the increase in compressor noise due to uneven rotation can be suppressed, and the noise of the refrigerator can be reduced.

The invention of the refrigerator control device according to claim 6 is the invention according to any one of claims 1 to 4, wherein when the quick freezing operation is performed, the on-timing of the switch element is advanced, so that The compressor is driven at an energization angle equal to or higher than that, and when the quick freezing operation is performed in the refrigerator, the compressor is driven at the maximum rotation speed by overlap energization. As a result, the rotational speed can be made higher than when the compressor is operated by energization at 120 degrees, the evaporation temperature of the refrigerant during quick freezing can be lowered, and the quick freezing time can be shortened.

Invention of the refrigerator of the control device according to claim 7 is the invention according to any one of claims 1 to 4, and when the refrigerator installation, when the refrigerator is powered up or after defrosting control, When the internal temperature is higher than the set temperature, the on-timing of the switch element is advanced and the compressor is operated at an energization angle of 120 degrees or more. It can be cooled.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the same reference numerals are given to the same configurations as those of the conventional example or the embodiments described above, and detailed description thereof will be omitted. . The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a block diagram of a refrigerator control device according to Embodiment 1 of the present invention. FIG. 2 is a timing chart of the switch element and position detecting means of the same embodiment.

  In the following description, the compressor motor will be described as a surface magnet type (SPM) motor.

  In FIG. 1, the compressor 1 is driven by a compressor driving device 2. The position detection means 3 detects the rotor position of a brushless DC motor (not shown) mounted on the compressor 1.

  In addition, the compressor driving device 2 includes a power supply device 4 that supplies power to the compressor 1. The power supply device 4 includes a switch unit 5 and a switch control unit 6 that puts the switch unit 5 into an energized state or a non-energized state. The switch unit 5 has six switch elements 7 to 12.

  In this embodiment, an IGBT using a silicon semiconductor is used, but a MOSFET, a bipolar type, a DGMOS, a GTO, or the like may be used. In addition to silicon, germanium, silicon carbide (SiC), or the like is used. Also good.

  The on-timing control means 13 determines the timing for switching the switch elements 7 to 12 from the non-energized state to the energized state, and the off-timing control means 14 shifts the switch elements 7 to 12 from the energized state to the non-energized state. The timing to perform is determined.

  By making the timing of turning on the switch elements 7 to 12 by the on timing control means 13 earlier than the timing of turning off the switch elements 7 to 12 by the off timing control means 14, the overlap energization is possible.

  The smoothing capacitors 15 and 16 double-voltage rectify the voltage rectified by the rectifying elements 19 to 22 through the AC power received from the power supply 17 through the choke coil 18. Although voltage doubler rectification is performed in the present embodiment, a configuration in which a DC voltage by full wave rectification is input to the power supply device 4 may be used.

  Next, the operation of the first embodiment will be described using a timing chart showing the energization / non-energization timings of the switch elements 7 to 12 in FIG. 2 and the position detection timing by the position detection means 3.

  In FIG. 2, a power source 17 (commercial power source) is supplied to the compressor driving device 2, passes through a choke coil 18, and a DC voltage rectified by rectifying elements 19 to 20 and a smoothing capacitor is input to the switch unit 5. The on / off operation of the switch elements 7 to 12 provided in the switch unit 5 by the switch control unit 5 and the position detection signal acquisition timing obtained by the position detection unit 3 when the compressor 1 is driven are shown. Is.

  Up, Vp, Wp, Un, Vn, and Wn in this timing chart correspond to the operation timings of the switch elements 7, 9, 11, 8, 10, and 12 in FIG. In the present embodiment, the high position in the timing chart indicates that the switch element is energized, and the upper arm side of Up, Vp, and Wp, that is, the switch elements 7, 9, and 11 are energized within the energization section. The PWM energization that repeats non-energization changes the energization rate and changes the effective value of the voltage applied to the motor winding.

  The position signal acquisition timing by the position detection means 3 is a position signal obtained by detecting a zero cross point of the motor induced voltage. When both the on-timing control means 13 and the off-timing control means 14 are commutated at 120 degrees energization and at an advance angle of 0 degrees, a commutation operation is performed to switch the energized phase of the motor 30 electrical degrees after obtaining the position signal.

  In the present embodiment, in the commutation operation, when switching the switch elements 7 to 12 from the off state to the on state, the advance angle is 0 degree to a maximum of 30 degrees, that is, the timing for turning on the switch elements 7 to 12 is the position. The timing of shifting the switch elements 7 to 12 from the ON state to the OFF state is from after the position signal is acquired, within a range from 0 degrees (advance angle 30 degrees) immediately after signal acquisition to 30 degrees electrical angle (advance angle 0 degrees). By setting 30 degrees (advance angle 0 degrees), the advance angle of the timing at which the switch elements 7 to 12 are switched from the OFF state to the ON state becomes the overlap energization angle, which is higher than when the compressor 1 is driven by 120 degree energization. It can be driven at the rotational speed.

  FIG. 3 is a timing chart of the switch element and position detecting means of the first embodiment. In this timing chart, the advance angle control is performed even when the switch elements 7 to 12 are switched from on to off, The advance angle when the switch elements 7 to 12 are switched from OFF to ON by the timing control means 13 and the advance angle when the switch elements 7 to 12 are switched from ON to OFF timing by the OFF timing control means 14 When the electrical angle is 60 degrees or less, the advance timing of the switch elements 7 to 12 is larger than the advance timing of the off timing, and the advance timing of the on timing and off timing is 30 degrees or less, respectively. It is configured to be able to perform control having both lap energization control and advance angle control.

  Therefore, the present invention can be applied to a motor that is driven by using a combination of magnet torque and reluctance torque, such as an IPM motor.

  As described above, the refrigerator control device according to the first embodiment includes the compressor 1 using the brushless DC motor, the power supply unit 4 that supplies power to the compressor 1, and 66 provided in the power supply unit 4. In order to change the energization phase of the compressor 1, the switch unit 5 comprising the switch elements 7 to 12, the position detection means 3 for detecting the rotor position of the compressor 1, and the energization phase of the switch unit 5. When the switch elements 7 to 12 are energized, the timing at which the switch unit 5 is turned on with respect to the position signal of the position detecting means 3 is provided. The compressor 1 is driven at an energization angle (overlap energization) of 120 degrees or more from the turn-off timing, so that the field weakening by the advance angle control and the output voltage by the wide angle energization Obtained synergy with temperature, than when driven at 120 ° conduction, and the torque-up of the motor, it is possible to raise the maximum speed of the compressor 1.

  In addition, when the maximum number of rotations is determined in advance, it is possible to use a motor with higher efficiency than the conventional motor that is used by 120-degree energization for the compressor 1, and the power consumption of the refrigerator can be reduced.

  Furthermore, it is possible to advance the switching timing of the switch element from on to off, so the overlap energization can be performed by setting the switching timing of the switching element from off to on earlier than the transition timing from on to off. Therefore, it can be applied to a motor that is driven by using both a magnet torque and a reluctance torque like an IPM motor.

(Embodiment 2)
FIG. 4 is a block diagram of a refrigerator control device according to Embodiment 2 of the present invention, and FIG. 5 is an operation flowchart of the refrigerator control device according to the embodiment.

  In FIG. 4, the rotation speed detection means 23 detects the current rotation speed of the compressor 1 from the position signal obtained from the position detection means 3. Further, the energization rate detection unit 24 detects the current energization rate of the current PWM control from the switch control unit 6 so that when the energization rate reaches 100% or the maximum energization rate, the on timing control unit 13 and the off timing are detected. The advance angle of the control means 14 is set, and overlap energization is possible.

  Further, the target rotation speed setting means 25 drives the rotation speed of the compressor 1 from outside / inside information such as outside air temperature information, inside temperature information, defrost control information, door opening / closing frequency and door opening / closing time, and quick freezing control command. Is determined and set as the target speed. The rotation speed comparison means 26 compares the current rotation speed of the compressor 1 with the target rotation speed and confirms whether or not the current rotation speed has reached the target rotation speed.

  By adopting the configuration of the second embodiment, when quick freezing control is started, immediately after the end of defrosting control, when door opening and closing is frequently performed, or for cleaning the interior, the door is kept for a long time. When it is necessary to quickly cool the inside of the refrigerator immediately after the refrigerator is installed, the compressor can be operated at a higher speed than when 120 degrees energized by the overlap control, and the cooling time in the refrigerator can be shortened.

  Next, the operation will be described with reference to the block diagram of FIG. 4 and the flowchart of FIG. First, at step 101, the target rotation speed setting means 25 sets the target of the compressor 1 on the basis of information inside and outside the refrigerator such as outside air temperature information, inside temperature information, defrost control, door opening / closing information, door opening time, quick freezing control, and the like. The rotation speed is set, and at step 102, the rotation speed detection means 23 detects the current rotation speed of the compressor 1 based on the position signal obtained by the position detection means 3.

  In the next step 103, the current rotational speed of the compressor 1 obtained by the rotational speed detection means 23 is compared with the target rotational speed of the compressor 1 set by the target rotational speed setting means 25, and the target rotational speed is the current rotational speed. If it is smaller than the number, the process is terminated. If the target speed is larger than the current speed, the process proceeds to step 104.

  In step 104, the energization rate of the switch elements 7 to 12 is detected by the energization rate detection means 24. When the energization rate of the switch elements 7 to 12 reaches 100% or the maximum energization rate (for example, 99%), the process proceeds to step 105, and the on-timing control means 13 causes the switch elements 7 to 12 to shift from the off state to the on state. Overlap energization is performed by advancing the on timing. When the energization rate of the switch elements 7 to 12 is less than 100% or less than the maximum energization rate (for example, 99%), the process proceeds to step 106 and the energization rate is increased.

  As described above, the refrigerator control device according to the present embodiment includes the compressor 1, the position detection unit 3, the switch unit 5, the switch elements 7 to 12 provided in the switch unit 5, the switch control unit 6, The on-timing control means 13, the off-timing control means 14, the rotation speed detection means 23, the energization rate detection means 24, the target rotation speed setting means 25, and the rotation speed comparison means 26 are configured. And the target rotational speed, the current rotational speed is slower than the target rotational speed as a result of the comparison, and the energization ratio of the switch elements 7 to 12 detected by the energization ratio detecting means 24 is 100% or the maximum energization ratio (for example, 99%). Since the overlap energization is performed only when it reaches (), the compressor can be driven at a higher rotational speed than when driving at the maximum energization rate of 120 degrees energization.

  Furthermore, in order to set the target number of rotations of the compressor from information such as inside and outside the refrigerator such as outside temperature, inside temperature, defrost control, door opening / closing times, door opening time, quick freezing control, etc. and information such as usage status, When it is necessary to quickly cool the motor, it is possible to set the target rotational speed that is higher than the rotational speed that can be driven at 120 ° energization at the maximum energization rate and drive by overlap energization.

(Embodiment 3)
FIG. 6 is a block diagram of a refrigerator control device according to Embodiment 3 of the present invention, and FIG. 7 is an operation flowchart of the refrigerator control device according to the embodiment.

  In FIG. 6, the overlap angle addition / subtraction means 27 adjusts the overlap angle by increasing / decreasing the timing at which the switch element shifts from OFF to ON by the ON timing control means 13.

  The energization rate determining means 28 sets the energization rate to 100% or the maximum energization rate when the compressor is driven by overlap energization, and sets the rotation speed of the compressor as the target when the overlap energization is not performed. In order to approach the rotational speed, the energization rate is increased or decreased.

  The operation of the third embodiment of the present invention will be described below with reference to the block diagram of FIG. 6 and the flowchart of FIG.

  First, at step 201, the target rotational speed of the compressor is set to the target rotational speed setting means 25 according to information inside and outside the refrigerator such as outside air temperature, internal temperature, defrost control, door opening / closing frequency, door opening time, quick freezing control, and the like. In step 202, based on the position signal obtained by the position detection means 3, the rotation speed detection means 23 detects the current rotation speed of the compressor.

  In step 203, the rotation speed comparison means 26 determines whether or not the current rotation speed and the target rotation speed match. If they match, the process returns to step 201 and repeats the processing thereafter. If the current rotational speed does not match the target rotational speed, if the result of the rotational speed comparison means 26 in step 204 is slower than the target rotational speed, the process proceeds to step 205.

  In step 205, the energization rate of the switch elements 7 to 12 is determined by the energization rate detection means. If the energization rate has not reached 100% or the maximum energization rate (for example, 99%), the process proceeds to step 209 and the energization rate determination means 28 As a result, the current energization rate is increased by n% (for example, 0.5%), and the process returns to step 201 and thereafter this operation is repeated.

  If the energization rate reaches 100% or the maximum energization rate (for example, 99%), the process proceeds to step 206. If the advance angle of the current on-timing is 30 degrees or less, the overlap angle adding / subtracting unit 27 at step 207 The overlap energization angle is increased by advancing the electrical angle a degrees (for example, electrical angle 1 degree) to the advance timing of the on timing.

  If the on-timing advance angle is 30 degrees or more, the on-timing advance angle is set to 30 degrees in step 208, and the operation returns to step 201 and this operation is repeated.

  If the current rotational speed is faster than the target rotational speed in step 204, the process proceeds to step 210, where it is determined whether the on-timing advance angle control is being performed, that is, whether the overlap energization is being performed. The energization rate is decreased by m% (for example, 1%) by the lap angle addition / subtraction means 27 so that the current rotation speed approaches the target rotation speed. Thereafter, the process returns to step 201 and repeats the same operation.

  If the overlap energization is being performed at step 210, the process proceeds to step 211 to determine whether the advance angle of the current on-timing has reached 0 degrees. If the on-timing advance is 0 degrees or less (reaches 0 degrees), the on-timing advance is set to 0 degrees (step 213). If the on-timing advance is not 0 degrees, the electrical angle is calculated from the on-timing advance. By decreasing b degrees (for example, 1 degree), the overlap energization angle is decreased and approaches the target rotational speed. Thereafter, returning to step 201, the same operation is repeated.

  As described above, the refrigerator control apparatus according to the present embodiment includes the compressor 1, the position detection unit 3, the switch unit 5, the switch elements 7 to 12 provided in the switch unit 5, the switch control unit 6, and the on timing. The control means 13, the off timing control means 14, the rotation speed detection means 23, the energization rate detection means 24, the target rotation speed setting means 25, the rotation speed comparison means 26, the overlap angle addition / subtraction means 27, and the energization rate determination means 28 are configured. Then, the energization rate of the switch elements 7 to 12 is detected, the current rotation speed of the compressor 1 is compared with the target rotation speed, and the energization ratio reaches 100% when the current rotation speed is slower than the target rotation speed. If not, the energization rate is increased, and if the energization rate has reached 100%, the overlap angle is gradually increased to bring the current rotational speed closer to the target rotational speed.

  Also, when the current rotational speed is faster than the target rotational speed and the overlap energization is in progress, the overlap angle is gradually decreased to approach the target rotational speed. By gradually decreasing, the current rotational speed is made closer to the target rotational speed.

  As a result, the optimum overlap energization angle can be obtained by the deviation between the current rotation speed and the target rotation speed, and high-precision rotation speed control with respect to the target rotation speed can be realized even during overlap energization.

  As described above, the refrigerator control device according to the present invention performs high-efficiency driving, high-speed driving, and low-noise driving of the compressor, and reduces the power consumption, cooling speed, and noise reduction of the refrigerator. It can be applied to all devices that use the machine (vending machines, food showcases, commercial refrigerators, air conditioners, dehumidifiers, etc.).

The block diagram of the control apparatus of the refrigerator by Embodiment 1 of this invention Timing chart of switch element and position detecting means according to embodiment 1 of the present invention Timing chart of switch element and position detecting means according to embodiment 1 of the present invention The block diagram of the control apparatus of the refrigerator by Embodiment 2 of this invention Operation flow chart of the refrigerator control device according to the second embodiment of the present invention. The block diagram of the control apparatus of the refrigerator by Embodiment 3 of this invention Operational Flowchart of Refrigerator Control Device according to Embodiment 3 of the Present Invention The figure which shows the control apparatus of the conventional refrigerator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Compressor drive device 5 Switch part 7, 8, 9, 10, 11, 12 Switch element 13 On-timing control means 14 Off-timing control means 23 Rotation speed detection means 24 Energization rate detection means 25 Target rotation speed setting means 26 Rotational speed comparison means 27 Overlap angle addition / subtraction means 28 Energization rate determination means

Claims (7)

A compressor using a brushless DC motor; a power supply device that supplies power to the compressor; and a position detection unit that detects a rotor position of the brushless DC motor, wherein the power supply device includes the position detection unit. The switch unit is composed of six switch elements that are turned on or off in accordance with the position signal obtained in the above, and the timing at which the switch unit is turned on with respect to the position signal of the position detection means is Advancement, rotation speed detection means for detecting the current rotation speed of the compressor, current flow rate detection means for detecting the current flow ratio of the current switch unit, and target rotation speed setting for setting the target rotation speed And a rotational speed comparison means for comparing the target rotational speed with the current rotational speed, and when the compressor is driven by 120 degree energization, the energization rate is set to 100% or set When the target rotational speed is not reached even when the large energization rate is reached, the switch portion is deenergized from the non-energized state to advance the on-timing to drive the compressor at an energization angle of 120 degrees or more, and the overlap angle addition / subtraction means When the compressor is driven at an energization angle of 120 degrees, even when the energization rate reaches 100% or the set maximum duty, the compressor speed does not reach the target speed In the overlap angle addition / subtraction means, the energization angle of the switch unit is increased by gradually advancing the on-timing of the switch element, the compressor rotation speed is brought close to the target rotation speed, When the switch element's on-timing is advanced and the switch section is driven at an energization angle of 120 degrees or more, when slowing down the compressor rotation, gradually delay the switch element's on-timing. Go, even if energization angle becomes 120 degrees, when not reached the target rotational speed of the compressor, refrigerator control apparatus characterized by gradually lowering the duty factor.   The refrigerator according to claim 1, wherein the timing when the switch element is changed from the non-energized state to the energized state is earlier than the timing when the switch element is changed from the energized state to the non-energized state in an electrical angle range of 0 degrees to 30 degrees. Control device.   An on-timing control unit for turning on each switch element of the switch unit; and an off-timing control unit for turning off the switch element. The on-timing and off-timing of the switch unit are set with respect to the position signal of the position detecting unit. 3. The compressor is driven by setting the energization angle of the switch element to an electrical angle of 120 degrees or more by advancing both of them and making the ON timing of the switch element earlier than the OFF timing. The control apparatus of the refrigerator of description.   The commutation timing of the energized phase of the compressor is such that the sum of the electrical angle that advances the on-timing of the switch unit and the electrical angle that advances the off-timing with respect to the position signal of the position detecting means is 60 degrees or less, and 4. The refrigerator control device according to claim 1, wherein an electrical angle for advancing on-timing is equal to or greater than an electrical angle for advancing off-timing. 5. When the compressor is driven at an energization angle of 120 degrees and the energization rate is not 100% or the maximum energization rate has not been reached, to accelerate the compressor rotation, first increase the energization rate. When the compressor rotation speed is brought close to the target rotation speed and the energization rate reaches 100% or the maximum energization rate, the on-timing of the switch element is advanced to increase the energization angle of the switch unit, and the compressor The control device for a refrigerator according to claim 1 , wherein the rotation speed is made closer to the target rotation speed.   The refrigerator control device according to any one of claims 1 to 4, wherein when the quick freezing operation is performed, the compressor is driven at an energization angle of 120 degrees or more by advancing the ON timing of the switch element.   2. When the refrigerator is installed, when the refrigerator is turned on, or after defrosting control, if the internal temperature is higher than the set temperature, the switch element is turned on and the compressor is operated at a conduction angle of 120 degrees or more. The control apparatus of the refrigerator as described in any one of Claim 4.

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