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WO2023002559A1 - Dispositif de source d'alimentation cc et appareil à cycle de réfrigération - Google Patents

Dispositif de source d'alimentation cc et appareil à cycle de réfrigération Download PDF

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Publication number
WO2023002559A1
WO2023002559A1 PCT/JP2021/027106 JP2021027106W WO2023002559A1 WO 2023002559 A1 WO2023002559 A1 WO 2023002559A1 JP 2021027106 W JP2021027106 W JP 2021027106W WO 2023002559 A1 WO2023002559 A1 WO 2023002559A1
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WIPO (PCT)
Prior art keywords
operation mode
power supply
switching element
capacitor
speed
Prior art date
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Application number
PCT/JP2021/027106
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English (en)
Japanese (ja)
Inventor
裕一 清水
和徳 畠山
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Priority to JP2023536255A priority Critical patent/JPWO2023002559A1/ja
Priority to CN202180100321.7A priority patent/CN117616684A/zh
Priority to PCT/JP2021/027106 priority patent/WO2023002559A1/fr
Publication of WO2023002559A1 publication Critical patent/WO2023002559A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Definitions

  • the present disclosure relates to a DC power supply that supplies DC power to a load having a motor, and a refrigeration cycle device including the same.
  • Patent Document 1 discloses a switching element having first and second switching elements connected in series and first and second capacitors connected in series between output terminals to a load, and output from an AC power supply.
  • a direct current power supply is disclosed that converts an alternating current voltage to a direct current voltage.
  • a full-wave rectification mode in which the first and second switching elements are always turned off, and the first and second switching elements are appropriately controlled to be turned on, so that the voltage across the two capacitors is and a boost mode for charging to a voltage equal to or higher than the peak value of the AC voltage.
  • the two capacitors connected between the output terminals to the load are connected in series.
  • a combined capacitance which is the capacitance of the two capacitors connected in series, is smaller than the capacitance of the two capacitors alone. For example, if two capacitors have the same capacitance, the combined capacitance of the two capacitors connected in series is half the capacitance of the single capacitor.
  • the capacitance of the capacitors is small, the voltage ripple of each capacitor increases when the load of the DC power supply increases, and there is a problem that the deterioration of the life of the capacitors accelerates.
  • the capacitance of the capacitor is small, there is a problem that an increase in power source harmonics and deterioration of the power factor are caused, and the efficiency of the DC power supply is deteriorated.
  • a capacitor with a large capacitance is used to solve these problems, another problem arises in that the cost of the device increases.
  • the present disclosure has been made in view of the above, and aims to obtain a DC power supply device that can contribute to higher efficiency, lower cost, and longer life.
  • the DC power supply according to the present disclosure is a DC power supply that converts AC power into DC power and supplies DC power to a load having a motor.
  • a DC power supply device includes a rectifier circuit, a reactor, a charge storage section, a charging section, and a control section.
  • the rectifier circuit rectifies an AC voltage, which is the voltage of AC power.
  • a reactor is connected to the input side or the output side of the rectifier circuit.
  • the charge storage section has first and second capacitors connected in series and is connected across the output terminals to the load.
  • the charging unit includes first and second switching elements connected in series, a first backflow prevention element that prevents backflow of charge in the first capacitor, and a second backflow prevention element that prevents backflow of charge in the second capacitor. and two backflow prevention elements to selectively charge one or both of the first and second capacitors.
  • the control unit controls the operation of the charging unit, if the rotation speed of the motor is equal to or higher than the first speed, the electrostatic capacity when the charge storage unit is viewed from the charging unit is the first or second value. Either one of the first and second capacitors is individually charged by controlling the first and second switching elements so as to have the capacitance of a single capacitor.
  • the DC power supply device has the effect of contributing to higher efficiency, lower cost, and longer life.
  • FIG. 1 is a circuit diagram showing a configuration example of a DC power supply device according to Embodiment 1; A diagram showing an example of a switching control state in the DC power supply device according to Embodiment 1.
  • FIG. 2 shows each operation mode in the DC power supply device according to Embodiment 1;
  • FIG. 4 shows a first example of operation waveforms when the DC power supply according to Embodiment 1 operates in operation mode (1);
  • FIG. 4 shows a second example of operation waveforms when the DC power supply according to Embodiment 1 operates in operation mode (1);
  • FIG. 2 is a table summarizing the characteristics of each operation mode in the DC power supply according to Embodiment 1.
  • FIG. Flowchart for explaining the operation of the DC power supply device according to Embodiment 1 FIG.
  • FIG. 3 is a block diagram showing a first example of a hardware configuration that implements the functions of the control unit according to Embodiment 1;
  • FIG. 4 is a block diagram showing a second example of a hardware configuration that implements the functions of the control unit according to Embodiment 1;
  • FIG. 11 shows an example of operation waveforms when the DC power supply according to Embodiment 2 operates in operation mode (2);
  • Flowchart for explaining the operation of the DC power supply device according to the third embodiment A diagram showing a configuration example of a refrigeration cycle device according to Embodiment 6
  • FIG. 1 is a circuit diagram showing a configuration example of a DC power supply device according to Embodiment 1.
  • FIG. A DC power supply device 100 shown in FIG. 1 is configured to convert AC power supplied from an AC power supply 1 into DC power and supply the converted DC power to a load 8 .
  • the AC power supply 1 may be a single-phase power supply.
  • the load 8 may be any load as long as it receives supply of DC power and consumes power. In this paper, the load 8 is assumed to be an inverter load that drives a motor of a compressor used in equipment to which a refrigeration cycle is applied.
  • Devices to which the refrigerating cycle is applied include, for example, air conditioners, refrigerators, washer/dryers, refrigerators, dehumidifiers, heat pump water heaters, and showcases.
  • the load 8 is not limited to the load of equipment to which the refrigeration cycle is applied, and may be a vacuum cleaner, a fan motor, a ventilation fan, a hand dryer, an induction heating electromagnetic cooker, or the like.
  • the DC power supply device 100 includes a rectifier circuit 2, a reactor 3, a charging section 4, a charge storage section 6, a first voltage detection section 7a, a second voltage detection section 7b, and a , a third voltage detection unit 7 c and a control unit 10 .
  • the rectifier circuit 2 is configured as a three-phase full-wave rectifier circuit in which six rectifier diodes are connected in a full bridge.
  • the rectifier circuit 2 rectifies a three-phase AC voltage, which is the voltage of the three-phase AC power supplied from the AC power supply 1 .
  • the rectifier circuit 2 is configured as a single-phase full-wave rectifier circuit in which four rectifier diodes are connected in a full bridge.
  • the charge storage unit 6 has a first capacitor 6a and a second capacitor 6b connected in series.
  • the first capacitor 6a is positioned on the higher potential side
  • the second capacitor 6b is positioned on the lower potential side.
  • the first capacitor 6 a and the second capacitor 6 b are charged by the charging section 4 and retain the charges supplied from the charging section 4 .
  • the charging section 4 has a first switching element 4a and a second switching element 4b connected in series, a first backflow prevention element 5a, and a second backflow prevention element 5b.
  • Charging unit 4 is connected to the output side of rectifier circuit 2 via reactor 3 .
  • a series circuit of the first capacitor 6 a and the second capacitor 6 b is connected between the output terminals to the load 8 between the charging section 4 and the load 8 .
  • the reactor 3 is connected to the output side of the rectifier circuit 2 in FIG. 1, the configuration is not limited to this.
  • the reactor 3 may be connected to the input side of the rectifier circuit 2 , that is, between the AC power supply 1 and the rectifier circuit 2 .
  • first switching element 4a and the second switching element 4b is the illustrated IGBT (Insulated Gate Bipolar Transistors), but is not limited to this.
  • a MOSFET Metal Oxide Semiconductor Field Effect Transistor
  • Semiconductor elements other than IGBTs and MOSFETs may also be used.
  • Each of the first switching element 4a and the second switching element 4b may have a freewheeling diode connected in anti-parallel for the purpose of suppressing a surge voltage due to switching.
  • the first switching element 4a and the second switching element 4b are MOSFETs
  • parasitic diodes formed inside the MOSFETs may be used as free wheel diodes.
  • Materials forming the first switching element 4a and the second switching element 4b include not only silicon (Si) but also silicon carbide (SiC), which is a wide bandgap semiconductor, gallium nitride (GaN), gallium oxide ( Ga 2 O 3 ), diamond.
  • the midpoint of the series circuit composed of the first switching element 4a and the second switching element 4b is connected to the midpoint of the series circuit composed of the first capacitor 6a and the second capacitor 6b.
  • the anode of the first backflow prevention element 5a is connected to the collector of the first switching element 4a, and the cathode of the first backflow prevention element 5a is connected to the positive electrode side of the first capacitor 6a. That is, the first backflow prevention element 5a is connected in a direction that prevents the backflow of electric charges in the first capacitor 6a.
  • the cathode of the second backflow prevention element 5b is connected to the emitter of the second switching element 4b, and the anode of the second backflow prevention element 5b is connected to the negative electrode side of the second capacitor 6b.
  • the second backflow prevention element 5b is connected in a direction that prevents the backflow of electric charges in the second capacitor 6b. Moreover, with these configurations, the charging unit 4 selectively charges one or both of the first switching element 4a and the second switching element 4b.
  • the first voltage detection section 7a detects the capacitor voltage Vpc, which is the voltage of the first capacitor 6a
  • the second voltage detection section 7b detects the capacitor voltage Vnc, which is the voltage of the second capacitor 6b.
  • the third voltage detection section 7c detects an output voltage Vdc which is the voltage between the positive electrode of the first capacitor 6a and the negative electrode of the second capacitor 6b.
  • the detected value of the capacitor voltage Vpc detected by the first voltage detector 7a, the detected value of the capacitor voltage Vnc detected by the second voltage detector 7b, and the output voltage detected by the third voltage detector 7c The detected value of Vdc is input to the control unit 10 .
  • FIG. 2 is a diagram showing an example of a switching control state in the DC power supply device according to Embodiment 1.
  • FIG. FIG. 3 is a diagram showing each operation mode in the DC power supply device according to Embodiment 1.
  • symbol of each component is abbreviate
  • State A in FIG. 2 shows a state in which both the first switching element 4a and the second switching element 4b are controlled to be off. In this state, the first capacitor 6a and the second capacitor 6b are charged.
  • State B in FIG. 2 shows a state in which the first switching element 4a is controlled to be ON and the second switching element 4b is controlled to be OFF. In this state, only the second capacitor 6b is charged.
  • State C in FIG. 2 shows a state in which the second switching element 4b is controlled to be ON and the first switching element 4a is controlled to be OFF. In this state, only the first capacitor 6a is charged.
  • State D in FIG. 2 shows a short-circuit state in which both the first switching element 4a and the second switching element 4b are on-controlled. In this state, neither the first capacitor 6a nor the second capacitor 6b are charged.
  • the DC voltage supplied to the load 8 is controlled while suppressing the rush current in which the current flowing from the AC power supply 1 sharply increases.
  • FIG. 3 shows each operation mode in the DC power supply device 100 according to the first embodiment.
  • the DC power supply device 100 according to Embodiment 1 has nine operation modes (1) to (9). Each operation mode will be described below.
  • a to D in FIG. 3 indicate each state in FIG.
  • the on-duty D1 used in the following description is the ratio of the time during which the first switching element 4a is in the ON state to the total time during which it is in the ON state and the OFF state.
  • the on-duty D2 is the ratio of the time during which the second switching element 4b is in the ON state to the total time during which it is in the ON state and the OFF state.
  • the operation mode (1) is a mode in which the first switching element 4a and the second switching element 4b are always controlled to be off.
  • the first capacitor 6a and the second capacitor 6b are each charged, and the magnitude of the output voltage Vdc becomes about ⁇ 2 times the effective value Vac of the AC voltage applied from the AC power supply 1.
  • the first capacitor 6a and the second capacitor 6b are electrically connected in series and charged. Therefore, the electrostatic capacity when the charge accumulating part 6 is viewed from the charging part 4 during charging is the combined electrostatic capacity, which is the total electrostatic capacity of the first capacitor 6a and the second capacitor 6b.
  • the combined capacitance is approximately half the capacitance of the first capacitor 6a or the second capacitor 6b alone.
  • the operation mode (2) is a mode in which the on-duty D1 of the first switching element 4a is in the range of 0% ⁇ D1 ⁇ 100%, and the second switching element 4b is always in the OFF control state. At this time, the second capacitor 6b is charged, and the magnitude of the output voltage Vdc becomes approximately ⁇ 2 times the effective value Vac of the AC voltage. In addition, since only the second capacitor 6b is charged, the capacitance of the second capacitor 6b when viewed from the charging unit 4 during charging is the value of the second capacitor 6b alone.
  • the operation mode (3) is a mode in which the first switching element 4a is always controlled to be off and the on-duty D2 of the second switching element 4b is in the range of 0% ⁇ D2 ⁇ 100%.
  • the first capacitor 6a is charged, and the magnitude of the output voltage Vdc becomes approximately ⁇ 2 times the effective value Vac of the AC voltage.
  • the capacitance of the first capacitor 6a when viewed from the charging unit 4 during charging is the value of the first capacitor 6a alone.
  • the phase difference between the signal Gp and the drive signal Gn for the second switching element 4b is 0 degrees.
  • energy is stored in the reactor 3 by short-circuiting between the positive electrode of the first capacitor 6a and the negative electrode of the second capacitor 6b.
  • the energy stored in the reactor 3 charges the first capacitor 6a and the second capacitor 6b. Thereby, the magnitude of the output voltage Vdc can be made larger than in the operation modes (1) to (3).
  • the first capacitor 6a and the second capacitor 6b are charged while being electrically connected in series. Therefore, the electrostatic capacitance when the charge accumulating portion 6 is viewed from the charging portion 4 during charging is the combined electrostatic capacitance of the first capacitor 6a and the second capacitor 6b as a whole. 2 is about 1/2 of the capacitance of the single capacitor 6b. Since the phase difference between the drive signal Gp and the drive signal Gn is set to 0 degrees, the magnitude of the capacitor voltage Vpc and the magnitude of the capacitor voltage Vnc are approximately equal. Also, the phase difference does not necessarily have to be 0 degrees, but if there is a phase difference, the capacitor voltage Vpc and the capacitor voltage Vnc become unbalanced.
  • the operation mode (5) is a mode in which the on-duty D1 of the first switching element is in the range of 0% ⁇ D1 ⁇ 100%, and the second switching element 4b is always on.
  • the period of state D energy is stored in the reactor 3 by short-circuiting between the positive electrode of the first capacitor 6a and the negative electrode of the second capacitor 6b.
  • the energy stored in the reactor 3 charges the first capacitor 6a.
  • the magnitude of the output voltage Vdc can be made larger than in the operation modes (1) to (3).
  • the capacitance of the first capacitor 6a when viewed from the charging unit 4 during charging is the value of the first capacitor 6a alone.
  • the operation mode (6) is a mode in which the first switching element 4a is always on-controlled and the on-duty D2 of the second switching element 4b is in the range of 0% ⁇ D2 ⁇ 100%.
  • the period of state D energy is stored in the reactor 3 by short-circuiting between the positive electrode of the first capacitor 6a and the negative electrode of the second capacitor 6b.
  • the period of state B the energy stored in the reactor 3 charges the second capacitor 6b.
  • the magnitude of the output voltage Vdc can be made larger than in the operation modes (1) to (3).
  • the capacitance when the charge storage unit 6 is viewed from the charging unit 4 during charging is the value of the second capacitor 6b alone.
  • the phase difference between the signal Gp and the drive signal Gn for the second switching element 4b is 180 degrees.
  • the second capacitor 6b is charged, and during state C, the first capacitor 6a is charged.
  • the magnitude of the output voltage Vdc has a relationship of Vac ⁇ 2 ⁇ Vdc ⁇ Vac ⁇ 2 ⁇ 2 with respect to the effective value Vac of the AC voltage. Note that the magnitude of the output voltage Vdc is proportional to the on-duties D1 and D2.
  • the capacitance when the charge storage unit 6 is viewed from the charging unit 4 during charging is the same as that of the first capacitor 6a or the second capacitor 6b. is the value of the capacitor 6b alone.
  • the second capacitor 6b is charged, and during state C, the first capacitor 6a is charged.
  • the capacitance when the charge storage unit 6 is viewed from the charging unit 4 during charging is the same as that of the first capacitor 6a or the second capacitor 6b. is the value of the capacitor 6b alone.
  • the phase difference between the signal Gp and the drive signal Gn for the second switching element 4b is 180 degrees.
  • energy is stored in the reactor 3 by short-circuiting the positive electrode of the first capacitor 6a and the negative electrode of the second capacitor 6b.
  • the energy stored in the reactor 3 charges the second capacitor 6b during the state B period, and charges the first capacitor 6a during the state C period.
  • the magnitude of the output voltage Vdc can have a relationship of Vdc>Vac ⁇ 2 ⁇ 2 with respect to the effective value Vac of the AC voltage.
  • the capacitance when the charge storage unit 6 is viewed from the charging unit 4 during charging is the same as that of the first capacitor 6a or the second capacitor 6b. is the value of the capacitor 6b alone.
  • the direct current applied to the load 8 Voltage can be controlled.
  • FIG. 4 is a diagram showing a first example of operation waveforms when the DC power supply according to Embodiment 1 operates in operation mode (1).
  • FIG. 5 is a diagram showing a second example of operation waveforms when the DC power supply according to Embodiment 1 operates in operation mode (1).
  • FIG. 6 is a table summarizing the characteristics of each operation mode in the DC power supply according to the first embodiment.
  • 7 is a flowchart for explaining the operation of the DC power supply device according to Embodiment 1.
  • FIG. 4 is a diagram showing a first example of operation waveforms when the DC power supply according to Embodiment 1 operates in operation mode (1).
  • FIG. 5 is a diagram showing a second example of operation waveforms when the DC power supply according to Embodiment 1 operates in operation mode (1).
  • FIG. 6 is a table summarizing the characteristics of each operation mode in the DC power supply according to the first embodiment.
  • 7 is a flowchart for explaining the operation of the DC power supply device according to Embodi
  • the capacitance of the charge storage unit 6 when viewed from the charging unit 4 is about 1/1 of the capacitance of the first capacitor 6a or the second capacitor 6b alone.
  • 2 is the operation mode. 4 and 5 show operation waveforms when the DC power supply 100 operates in operation mode (1). In each figure, the waveforms of the input current to the rectifier circuit 2, the voltage detected by the third voltage detector 7c, and the voltages detected by the first and second voltage detectors 7a and 7b are shown in order from the top. ing. Moreover, the horizontal axis of each figure represents time. The difference between the two is that FIG. 4 is an example in which the load power is 15 kW, ie, a light load, whereas FIG.
  • the load power is 30 kW, ie, a medium load or heavy load.
  • the ripple of the output voltage Vdc is kept small.
  • the ripple of the output voltage Vdc becomes large.
  • state A continues as shown in FIGS.
  • Charging is performed in a state of about half the capacitance of the second capacitor 6b alone. Therefore, as shown in FIG. 5, when the load power increases, the ripples of the output voltage Vdc and the output current increase.
  • the life deterioration of the first capacitor 6a or the second capacitor 6b accelerates.
  • the capacitance of the first capacitor 6a or the second capacitor 6b is small, the efficiency of the DC power supply 100 may be deteriorated due to an increase in power source harmonics and deterioration of the power factor.
  • a capacitor with a large capacitance is used to solve these problems, another problem arises in that the cost of the device increases.
  • the drive frequency of the compressor motor is often increased in order to achieve higher refrigeration capacity.
  • the maximum output voltage of the inverter is determined by the output voltage of the DC power supply 100 . Therefore, in order to apply a higher voltage to load 8, the output voltage of DC power supply 100 must be increased.
  • the DC power supply 100 is required to output a voltage sufficient to drive the load 8, suppress power supply harmonics, and operate with a high power factor.
  • each embodiment of this paper uses different operation modes according to the operating conditions of the load.
  • an operation mode not to be used is determined.
  • the operation mode (4) is not used.
  • operation modes (1) to (3) are referred to as “first operation mode”, “second operation mode” and “third operation mode” respectively, and operation modes (5) to ( 9) are sometimes referred to as a "fourth mode of operation”, a "fifth mode of operation”, a “sixth mode of operation”, a “seventh mode of operation” and an “eighth mode of operation", respectively.
  • Embodiment 1 Next, the operation of the DC power supply device 100 according to Embodiment 1 will be described.
  • the load 8 is a compressor as an example
  • operation modes (1) to (3) and operation modes (5) to (9) are selectively used according to the rotation speed of the compressor motor. do.
  • FIG. 6 shows the magnitude of the output voltage Vdc in operation modes (1) to (9) and the combined capacitance corresponding to each operation mode. , the load torque and the rotation speed are shown.
  • the magnitude of the output voltage Vdc is determined by the magnitude of the reactor 3, the on-duty D1 of the first switching element 4a, and the on-duty D2 of the second switching element 4b.
  • the operation mode (9) can output the largest output voltage Vdc.
  • a voltage lower than the theoretical maximum voltage that can be output may be set as the maximum voltage for practical use in consideration of noise or heat dissipation.
  • the maximum voltage in actual use is assumed to be Vmax.
  • the output voltage Vdc is approximately the same as the induced voltage of the motor.
  • the maximum rotation speed that can be operated at the maximum voltage Vmax in practical use ie, the upper limit of the rotation speed of the motor, is defined as Nmax.
  • the magnitude of the output voltage Vdc is 2 ⁇ 2 times the effective value Vac of the AC voltage.
  • the maximum rotation speed Nmin may be called “first speed” and the maximum rotation speed Nmid may be called "second speed”.
  • the maximum rotation speed for each of these operation modes is used to determine the rotation speed region.
  • the rotation speed range of 0 to Nmin is defined as a low speed region
  • the rotation speed range of Nmin to Nmid is defined as a medium speed region
  • the rotation speed range of Nmid to Nmax is defined as a high speed region.
  • flux-weakening control is used to increase the rotational speed by supplying a current so as to lower the induced voltage of the motor. Therefore, the maximum rotational speeds Nmin, Nmid, and Nmax for each operation mode slightly change depending on the amount of current generated by the flux-weakening control.
  • each operation mode is switched according to the rotational speed range.
  • operation mode (4) is not used. A specific processing flow will be described below with reference to FIG.
  • control unit 10 determines whether or not the rotational speed is in the low speed range (step S11). If the rotation speed is in the low speed range (step S11, Yes), the control unit 10 selects one of the operation modes (1) to (3) (step S12), and the first operation is performed in the selected operation mode. The switching element 4a and the second switching element 4b are driven (step S13). Henceforth, it returns to step S11 and repeats the processing flow of FIG.
  • step S11 determines whether the rotation speed is in the medium speed range (step S14). If the rotation speed is in the middle speed range (step S14, Yes), the control unit 10 selects one of the operation modes (5) to (8) (step S15), and selects the first operation mode in the selected operation mode.
  • the switching element 4a and the second switching element 4b are driven (step S13). Henceforth, it returns to step S11 and repeats the processing flow of FIG.
  • step S16 determines whether the rotation speed is in the high speed range. It should be noted that although it is highly likely that the rotation speed is in the high-speed region by the determination processing of steps S11 and S14, the possibility that the rotation speed will change after the processing of step S14 is not zero, and the rotation speed is near the boundary of the region. In consideration of the case where the position is located at , the judgment processing of step S16 is provided. If the rotation speed is not in the high speed region (step S16, No), the process returns to step S11 and repeats the processing flow of FIG.
  • step S16 if the rotation speed is in the high speed region (step S16, Yes), the control unit 10 selects the operation mode (9) (step S17), and switches the first switching element 4a and the second switching element 4a in the selected operation mode. 2 switching element 4b is driven (step S13). Henceforth, it returns to step S11 and repeats the processing flow of FIG.
  • the motor rotation speed for determining each speed range is calculated based on the rotation speed command value, the actual rotation speed of the motor obtained from the speed sensor or the position sensor, and the current of the motor. An estimate of the rotational speed obtained can be used.
  • the DC power supply device selectively selects one or both of the charge storage unit having the first and second capacitors connected in series and the first and second capacitors. and a charging unit for charging the battery.
  • the controller controls the first and second switching elements so that the capacitance when the charge storage unit is viewed from the charging unit becomes a single capacitance. to individually charge either one of the first and second capacitors.
  • the capacitance of the charge storage unit viewed from the charging unit is the capacitance of the first or second capacitor alone, even when the load power increases, the output voltage and the ripple of the output current are reduced. increase can be suppressed.
  • the capacitance of the charge storage unit when viewed from the charging unit is 1/2 of the capacitance of the first or second capacitor alone. can also suppress an increase in ripples in the output voltage and output current. If it is possible to suppress the increase in ripples in the output voltage and output current, it is possible to slow down the deterioration of the life of the capacitor, thereby contributing to the extension of the life of the DC power supply.
  • the control method according to the first embodiment can suppress the increase in the ripples of the output voltage and the output current while suppressing the increase in the capacitance of the first and second capacitors. Therefore, by using the control method according to the first embodiment, it is possible to contribute to the efficiency improvement and cost reduction of the DC power supply.
  • FIG. 8 is a block diagram illustrating a first example of a hardware configuration that implements the functions of the control unit according to Embodiment 1.
  • FIG. 9 is a block diagram illustrating a second example of a hardware configuration that implements the functions of the control unit according to Embodiment 1.
  • the processor 300 may be arithmetic means such as an arithmetic unit, a microprocessor, a microcomputer, a CPU (Central Processing Unit), or a DSP (Digital Signal Processor).
  • the memory 302 includes nonvolatile or volatile semiconductor memories such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), EEPROM (registered trademark) (Electrically EPROM), Magnetic discs, flexible discs, optical discs, compact discs, mini discs, and DVDs (Digital Versatile Discs) can be exemplified.
  • the memory 302 stores a program for executing the functions of the control unit 10 according to the first embodiment.
  • Processor 300 performs the above-described processing by exchanging necessary information via interface 304, executing programs stored in memory 302, and referring to tables stored in memory 302 by processor 300. It can be carried out. Results of operations by processor 300 may be stored in memory 302 .
  • the processing circuit 303 shown in FIG. 9 can also be used.
  • the processing circuit 303 corresponds to a single circuit, a composite circuit, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof.
  • Information to be input to the processing circuit 303 and information to be output from the processing circuit 303 can be obtained via the interface 304 .
  • part of the processing in the control unit 10 may be performed by the processing circuit 303 and the processing not performed by the processing circuit 303 may be performed by the processor 300 and the memory 302 .
  • Embodiment 2 Next, a DC power supply device according to Embodiment 2 will be described.
  • the load 8 is a compressor
  • the above-described operation modes are selectively used according to the load torque of the motor of the compressor and the rotational speed of the motor.
  • the operation mode (4) is not used as in the first embodiment. The same applies to other embodiments described below.
  • the operation mode (1) has the advantage of simple control because the first switching element 4a and the second switching element 4b may be kept in the off state at all times.
  • the capacitance of the charge accumulating portion 6 viewed from the charging portion 4 is approximately half the capacitance of the first capacitor 6a or the second capacitor 6b alone. Therefore, as shown in FIG. 5, when the load power increases, ripples in the output voltage Vdc and the output current increase, leading to an increase in power supply harmonics and a deterioration in the power factor.
  • an increase in load power may be considered synonymous with an increase in load torque.
  • step S21 the control unit 10 operates the DC power supply device 100 in operation mode (1) (step S21).
  • step S22 determines whether or not the load torque has increased during operation in operation mode (1) (step S22). If the load torque has not increased (step S22, No), the process returns to step S21 to repeat the process from step S21. On the other hand, if the load torque is increasing (step S22, Yes), it is determined whether or not the rotational speed of the motor has further increased (step S23). If the rotation speed has not increased (step S23, No), the control unit 10 selects either operation mode (2) or operation mode (3), and operates in the selected operation mode (step S24). , the processing flow of FIG. 10 ends. Further, when the rotational speed increases (step S23, Yes), the control unit 10 selects one of the operation modes (5) to (9), operates in the selected operation mode ( Step S25), the processing flow of FIG. 10 is terminated.
  • the determination process in step S22 may use a method of comparing the load torque increase amount with a threshold value, or a method of comparing the load torque increase ratio with a threshold value.
  • the rotation speed used in the determination process in step S23 may be a rotation speed command value, the actual rotation speed of the motor obtained from a speed sensor or a position sensor, and an estimated rotation speed calculated based on the current of the motor. can be done. Further, when the operation mode (1) is selected during operation in the operation mode selected in step S24 or step S25, the processing flow of FIG. 10 is called again.
  • the operation mode of the DC power supply 100 is changed from the operation mode (1) to the operation mode (2), the operation mode (3), or the operation mode (5).
  • the operation is switched to any one of (9).
  • the operation modes before and after switching are operation modes in which the capacitance when the charge storage unit 6 is viewed from the charging unit 4 is the value of the first capacitor 6a or the second capacitor 6b alone.
  • FIG. 11 is a diagram showing an example of operation waveforms when the DC power supply according to Embodiment 2 operates in operation mode (2).
  • the types and display positions of the operating waveforms in FIG. 11 are the same as in FIG.
  • the load power which is the load condition, is 30 kW, which is the same as in FIG.
  • the on-duty D1 of the first switching element 4a to be turned on is set to "10%".
  • the ripple of the output voltage Vdc is greatly improved as compared with FIG.
  • operation mode (2) and operation mode (3) are essentially the same in operation, but different in capacitors to be charged. Therefore, by controlling the operation time of the operation mode (2) and the operation time of the operation mode (3) to be approximately the same, the charge/discharge time of each capacitor can be equalized. As a result, the life of the charge accumulating section 6 as a whole can be extended as compared with the case where the charging and discharging times of the capacitors are not equalized.
  • operation mode (5) and operation mode (6) Therefore, by controlling the operation time of the operation mode (5) and the operation time of the operation mode (6) to be approximately the same, the charge/discharge time of each capacitor can be equalized.
  • the control unit during the operation in the first operation mode, anticipates an increase in the load torque of the motor and increases the rotation speed of the motor. is expected, control is performed to switch the operation mode to any one of the fourth to eighth operation modes.
  • the control unit changes the operation mode to the second operation mode when an increase in the rotation speed of the motor is not expected. or the third operation mode.
  • the operation modes before and after switching are operation modes in which the electrostatic capacitance when viewed from the charging unit is the value of the first or second capacitor alone.
  • the charge storage section can be charged in a state where the electrostatic capacity of the charge storage section when viewed from the charging section is large, it is possible to suppress power supply harmonics and perform operation with a high power factor.
  • Embodiment 3 Next, a DC power supply device according to Embodiment 3 will be described.
  • operation mode (1), operation mode (2) or operation mode (3), and operation mode (5) or operation mode In Embodiment 3, in the DC power supply devices according to Embodiments 1 and 2, operation mode (1), operation mode (2) or operation mode (3), and operation mode (5) or operation mode A preferred embodiment for transitioning to (6) will now be described.
  • the load 8 is a compressor is taken as an example.
  • FIG. 12 is a flowchart for explaining the operation of the DC power supply device according to Embodiment 3.
  • FIG. Note that the processing flow of FIG. 12 is called each time the compressor is started. In the processing flow of FIG. 12, it is assumed that the number of times the compressor has been started is stored in the memory 302 shown in FIG. 8 or the processing circuit 303 shown in FIG.
  • step S31 the control unit 10 controls the operation of the compressor.
  • step S31 If the number of times the compressor has been started is an odd number (step S31, Yes), the control unit 10 operates the DC power supply device 100 in operation mode (2) or operation mode (5) (step S32). If the compressor has been started an even number (step S31, No), the controller 10 causes the DC power supply 100 to operate in operation mode (3) or operation mode (6) (step S33).
  • step S31 of FIG. 12 Supplementary information about the processing flow in FIG. In step S31 of FIG. 12, "Yes” is determined when the number of times the compressor is started is an odd number, but "No” may be determined. In other words, the operation mode transition conditions may be reversed from those in the example of FIG. Even in this way, the charge/discharge time of each capacitor can be equalized.
  • step S31 of FIG. 12 the operation mode transition condition is switched based on the number of times the compressor is started. good. If the charge/discharge time is stored in the memory 302 or the processing circuit 303, the operation mode can be switched so that the charge/discharge time is approximately the same.
  • the control unit performs the second and third operations based on the number of times the load is started or the charging and discharging times of the first and second capacitors. Decide which of the modes of operation to select. This makes it possible to equalize the charging and discharging times of the capacitors, thereby extending the life of the entire charge storage section.
  • the control unit selects one of the fourth and fifth operation modes based on the number of times the load is started or the charging and discharging times of the first and second capacitors. Decide which operating mode to select. This makes it possible to equalize the charging and discharging times of the capacitors, thereby extending the life of the entire charge storage section.
  • Embodiment 4 Next, a DC power supply device according to Embodiment 4 will be described.
  • an operation mode suitable for starting the DC power supply will be described, taking as an example the case where the load 8 is a compressor.
  • the rotation speed command value of the motor of the compressor transitions to the speed increasing side or to the decelerating side depending on the tendency of temperature adjustment of the air conditioner. may be predictable.
  • the motor rotation speed command value is a value in the medium to high speed range. In such a case, starting the motor using operating mode (1) or operating mode (7) would be the preferred embodiment.
  • operation modes (5) to (7) have the same output voltage Vdc range.
  • operation mode (5) and operation mode (6) charge only one of the first capacitor 6a and second capacitor 6b
  • operation mode (1) and operation mode (7) to (9) are operation modes in which the first capacitor 6a and the second capacitor 6b are alternately charged.
  • operation mode (5) and operation mode (6) one capacitor is not charged. Therefore, in order to increase the rotation speed of the motor, when transitioning from operation mode (5) or operation mode (6) to operation mode (8) or operation mode (9) capable of outputting a higher voltage, , an inrush current may flow through an uncharged capacitor.
  • the DC power supply device 100 may operate the overcurrent protection function, etc., and stop the device. Moreover, when the overcurrent is large, there is a possibility that the first capacitor 6a and the second capacitor 6b are broken. This kind of rush current can be suppressed by switching the operation mode while gradually changing the on-duty D1 of the first switching element 4a and the on-duty D2 of the second switching element 4b. Therefore, although it is possible to switch the operation mode itself, there is a drawback that the control becomes somewhat complicated. Therefore, it can be said that it is desirable to use operation mode (1) or operation mode (7) under conditions in which the rotation speed of the motor tends to transition to the high speed side.
  • both the first capacitor 6a and the second capacitor 6b are charged.
  • the inrush current to the charge storage section 6 can be kept small. Thereby, the operation mode can be changed easily and safely.
  • the operation mode (1) or operation mode (7) is changed to operation mode (2) or operation mode ( 3)
  • the operating state is such that one of the first capacitor 6a and the second capacitor 6b is discharged. Therefore, by using the operation mode (1) and the operation mode (7), it is possible to avoid the occurrence of a rush current to the charge storage section 6 .
  • operation mode (1) and operation mode (7) it is possible to easily and safely transition to operation mode (2), operation mode (3), operation mode (5), or operation mode (6). Transition is possible. Therefore, it can be said that it is desirable to use the operation mode (1) or the operation mode (7) even if the motor rotation speed does not tend to transition to the high speed side. From the above, it is a desirable embodiment to use operation mode (1) or operation mode (7) when starting the motor.
  • the control unit starts up in the first operation mode or the sixth operation mode when starting up the DC power supply device. By doing so, it is possible to easily and safely transition to another operation mode while avoiding the occurrence of rush current to the charge storage section.
  • Embodiment 5 Next, a DC power supply device according to Embodiment 5 will be described.
  • the load 8 is a compressor is taken as an example, and operation modes (1) to (7) are selectively used according to the amount of circuit loss generated in the DC power supply.
  • the number of backflow prevention elements and switching elements present on the current path differs depending on the states A to D, as shown in FIG. Further, the range of Vdc that can be output is the same in each set of operation modes (1) to (3) and operation modes (5) to (7), but as shown in FIG. ⁇ D have different occurrence periods.
  • operation modes (5) and (6) have the same features as operation modes (2) and (3). As described above, the operation mode (4) is not used in each embodiment of this paper, but the features of the operation modes (5) and (6) will be explained in comparison with the operation mode (4).
  • operation mode (4) By comparing operation mode (4) with operation modes (5) and (6), it can be seen that state A is replaced by state B or state C, as shown in FIG. Therefore, as in the operation modes (1) to (3), in the case of a circuit configuration in which the conduction loss of the first switching element 4a is smaller than the conduction loss of the first backflow prevention element 5a, the operation mode ( Conduction loss can be reduced by using operation mode (6) instead of 4). Similarly, in the case of a circuit configuration in which the conduction loss of the second switching element 4b is smaller than the conduction loss of the second backflow prevention element 5b, the operation mode (5) is used instead of the operation mode (4). However, the conduction loss can be reduced.
  • the conduction losses of the first switching element 4a and the second switching element 4b, and the first backflow prevention element 5a and the second backflow prevention element 5b are known in terms of design. Therefore, by selecting operation modes (1) to (3), (5), and (6) so as to reduce the amount of conduction loss generated, a highly efficient DC power supply 100 can be realized. .
  • the corresponding The operation mode may be switched as appropriate so that the time integral value of the loss in the set of the switching element and the backflow prevention element becomes approximately the same.
  • the amount of heat generated by the pairs of corresponding switching elements and backflow prevention elements can be roughly uniformed, the concentration of load on some elements can be avoided, and the life of the device can be extended.
  • the DC power supply according to Embodiment 5 performs the following control.
  • the control unit operates in the second operation mode after starting in the first operation mode. Or switch to the fifth operating mode.
  • the amount of conduction loss generated can be reduced, so that a highly efficient DC power supply can be realized.
  • the operation mode may be switched to the third operation mode or the fourth operation mode. Even with such control, the amount of conduction loss generated can be reduced, and a highly efficient DC power supply can be realized.
  • Embodiment 6 refrigeration cycle equipment will be described as an application example of the DC power supply devices according to Embodiments 1 to 5.
  • FIG. FIG. 13 is a diagram illustrating a configuration example of a refrigeration cycle device according to Embodiment 6.
  • FIG. 13 shows a configuration example in which an inverter 30 is connected as the load 8 connected to the DC power supply device 100 of FIG.
  • the refrigerating cycle 200 has a compressor 31, a four-way valve 32, an internal heat exchanger 33, an expansion mechanism 34, and a heat exchanger 35, and these parts are sequentially connected via a refrigerant pipe 36, It constitutes a separate type refrigeration cycle device.
  • a compression mechanism 37 for compressing the refrigerant and a compressor motor 38 for operating the compression mechanism 37 are provided inside the compressor 31 .
  • Compressor motor 38 is driven by inverter 30 .

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  • Engineering & Computer Science (AREA)
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Abstract

Un dispositif de source d'alimentation CC (100) comprend : un circuit de redressement (2) ; une bobine de réactance (3) ; une unité de charge (4) ; une unité de stockage de charge (6) ; et une unité de commande (10). L'unité de stockage de charge (6) comporte des premier et second condensateurs (6a, 6b) qui sont connectés en série. L'unité de charge (4) comporte des premier et second éléments de commutation (4a, 4b) connectés en série et des premier et second éléments de prévention de circulation inversée (5a, 5b), et charge sélectivement le premier et/ou le second condensateur (6a, 6b). L'unité de commande (10) commande, lorsque la vitesse de rotation d'un moteur fournie à une charge (8) est égale ou supérieure à une première vitesse pendant la commande d'une opération de l'unité de charge (4), les premier et second éléments de commutation (4a, 4b) de sorte qu'une capacité électrique obtenue lorsque l'unité de stockage de charge (6) est vue depuis l'unité de charge (4) devienne égale à une capacité électrique du premier ou du second condensateur (6a, 6b) seul, et charge individuellement l'un ou l'autre des premier et second condensateurs (6a, 6b).
PCT/JP2021/027106 2021-07-20 2021-07-20 Dispositif de source d'alimentation cc et appareil à cycle de réfrigération Ceased WO2023002559A1 (fr)

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PCT/JP2021/027106 WO2023002559A1 (fr) 2021-07-20 2021-07-20 Dispositif de source d'alimentation cc et appareil à cycle de réfrigération

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58207870A (ja) * 1982-05-26 1983-12-03 Nec Corp 倍電圧整流チヨツパ回路
JP2000278955A (ja) * 1999-01-19 2000-10-06 Matsushita Electric Ind Co Ltd 電源装置及びこの電源装置を用いた空気調和機
WO2015063869A1 (fr) * 2013-10-29 2015-05-07 三菱電機株式会社 Dispositif d'alimentation électrique cc et dispositif de cycle de réfrigération
JP2019088047A (ja) * 2017-11-02 2019-06-06 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． 整流装置、電源装置、電動機装置及び空調装置
WO2021117090A1 (fr) * 2019-12-09 2021-06-17 三菱電機株式会社 Dispositif de pilotage de moteur et dispositif de climatisation

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015125240A1 (fr) * 2014-02-19 2015-08-27 三菱電機株式会社 Dispositif d'alimentation en courant continu, dispositif d'entraînement de moteur électrique équipé dudit dispositif d'alimentation en courant continu, et dispositif de cycle de réfrigération muni dudit dispositif d'entraînement de moteur électrique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58207870A (ja) * 1982-05-26 1983-12-03 Nec Corp 倍電圧整流チヨツパ回路
JP2000278955A (ja) * 1999-01-19 2000-10-06 Matsushita Electric Ind Co Ltd 電源装置及びこの電源装置を用いた空気調和機
WO2015063869A1 (fr) * 2013-10-29 2015-05-07 三菱電機株式会社 Dispositif d'alimentation électrique cc et dispositif de cycle de réfrigération
JP2019088047A (ja) * 2017-11-02 2019-06-06 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． 整流装置、電源装置、電動機装置及び空調装置
WO2021117090A1 (fr) * 2019-12-09 2021-06-17 三菱電機株式会社 Dispositif de pilotage de moteur et dispositif de climatisation

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