WO2014203561A1 - Dispositif à cycle de réfrigération - Google Patents

Dispositif à cycle de réfrigération Download PDF

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Publication number
WO2014203561A1
WO2014203561A1 PCT/JP2014/054529 JP2014054529W WO2014203561A1 WO 2014203561 A1 WO2014203561 A1 WO 2014203561A1 JP 2014054529 W JP2014054529 W JP 2014054529W WO 2014203561 A1 WO2014203561 A1 WO 2014203561A1
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Prior art keywords
voltage
converter
input
control circuit
control signal
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PCT/JP2014/054529
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English (en)
Japanese (ja)
Inventor
村上　治彦
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シャープ株式会社
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Priority to CN201480034940.0A priority Critical patent/CN105324926B/zh
Publication of WO2014203561A1 publication Critical patent/WO2014203561A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/025—Motor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • F24F2005/0064—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • 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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/4807—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode having a high frequency intermediate AC stage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Definitions

  • the present invention relates to a refrigeration cycle apparatus using a refrigeration cycle, and more particularly to a refrigeration cycle apparatus to which power generated by a solar cell is supplied.
  • Patent Document 1 Japanese Patent Laid-Open No. 2010-133427 is capable of operating due to fluctuations in electric power demand and heat demand, and further, generating heat from a gas turbine that can respond to fluctuations in electric power demand and heat demand, and heat generation from a fuel cell.
  • a thermoelectric supply system that combines power generation and exhaust heat utilization is disclosed.
  • Patent Document 2 describes a fluid having a large specific heat by driving a compressor and a cold / hot heat generator with electric power obtained by a solar power generator and generating cold / hot heat generated by the cold / hot heat generator.
  • a solar power generation high-efficiency cold / hot supply device is disclosed in which the hot water is temporarily stored in a cold storage / heat device arranged in a heat insulating container.
  • JP 2010-133427 A Japanese Patent Laid-Open No. 6-101931
  • An expensive storage battery is required to maintain a cooling capacity day and night in a refrigeration cycle apparatus that uses a solar battery as a power source.
  • a refrigeration cycle apparatus comprising a power supply circuit unit having a DC / DC converter, an inverter, and a control circuit, a compressor having a motor, and a refrigeration stocker in which the internal temperature is controlled by the compressor, The first control signal, the second control signal, and the third control signal are generated, and the DC / DC converter is responsive to the pair of input nodes to which the power generation voltage of the solar cell is applied and the first control signal,
  • An input impedance control circuit that controls the input impedance of the DC / DC converter, a transformer that generates a boosted voltage obtained by boosting the generated voltage in response to the second control signal, and a pair of output nodes that output the boosted voltage;
  • the inverter converts the boosted voltage to an AC voltage having a predetermined frequency in response to the third control signal, and the motor Is moving, the control circuit based on the voltage value of the power generation voltage before and after the input impedance changes of the DC / DC converter, so as to maintain the generator voltage to the input voltage set
  • a refrigeration cycle apparatus that can operate stably with a solar cell without using an expensive storage battery is realized.
  • FIG. 1 is a configuration diagram of a refrigeration cycle apparatus according to Embodiment 1.
  • FIG. 3 is an output characteristic diagram of a solar cell connected to the refrigeration cycle apparatus according to Embodiment 1.
  • FIG. 2 is a circuit diagram of a power supply device included in the refrigeration cycle apparatus according to Embodiment 1.
  • FIG. It is a wave form diagram and a characteristic view explaining operation of a power supply device with which a refrigerating cycle device concerning Embodiment 1 is provided.
  • 3 is a configuration diagram of a refrigeration cycle apparatus according to Embodiment 2.
  • FIG. 1 is a configuration diagram of a refrigeration cycle apparatus 100 according to the first embodiment.
  • the refrigeration cycle apparatus 100 includes a power supply device 2 and a refrigeration stocker 3.
  • the power supply device 2 converts the DC power of the solar cell (solar panel) 1 into AC power and supplies the AC power to the compressor 31 included in the refrigeration stocker 3.
  • the compressor 31 cools the inside of the refrigeration stocker 3 by cooling and further freezing the cooling agent 32 stored in the refrigeration stocker 3. In the nighttime when the solar cell 1 cannot generate DC power, the frozen cryogen 32 maintains the cooling state inside the refrigerator stocker 3.
  • the solar cell 1 has a capacity of 24 V rated output.
  • the power supply device 2 includes a DC / DC converter (DC / DC converter) 21, an inverter 22, and a control circuit 23.
  • the DC / DC converter 21 boosts the power generation voltage Vo of the solar cell to generate a boosted voltage Vbst.
  • Inverter 22 converts boosted voltage Vbst into AC voltage Vac having a predetermined frequency.
  • the control circuit 23 controls the step-up operation of the DC / DC converter 21 and the frequency of the AC voltage Vac generated by the inverter 22 as described later.
  • the refrigeration stocker 3 includes a compressor 31 having a motor M.
  • Motor M receives AC voltage Vac output from inverter 22 and rotates at a predetermined rotation speed.
  • FIG. 2 is an output characteristic diagram of solar cell 1 connected to refrigeration cycle apparatus 100 according to Embodiment 1.
  • FIG. 2 shows an example of the output characteristics of the solar cell 1 every hour from 8:00 to 11:00, the horizontal axis is the generated voltage Vo (unit V), and the vertical axis is the generated power P (unit W). .
  • the value of the maximum power point voltage Vm is around 19V, that is, 80% of the rated voltage 24V.
  • the values of the generated power P and the maximum power point voltage Vm in one day vary with the passage of time and further according to weather conditions such as fine weather / cloudy weather.
  • the range of the generated voltage Vo around 19 V indicated by the broken line indicates the fluctuation range of the maximum power point voltage Vm.
  • FIG. 3 is a circuit diagram of the power supply device 2 provided in the refrigeration cycle apparatus 100 according to the first embodiment.
  • the power supply device 2 includes a DC / DC converter 21, an inverter 22, and a control circuit 23.
  • the DC / DC converter 21 has a pair of input nodes N11 / N12 to which the power generation voltage Vo of the solar cell 1 is applied.
  • the potential of input node N12 is set to ground voltage GND1.
  • the DC / DC converter 21 further outputs a boosted voltage Vbst obtained by boosting the power generation voltage Vo of the solar cell 1 to a pair of output nodes N21 / N22.
  • the potential of output node N22 is set to ground voltage GND2.
  • the transformer TR has a primary coil L1 and a secondary coil L2.
  • the power generation voltage Vo of the solar cell 1 applied to the input node N11 is applied to one end of the primary coil L1.
  • a voltage obtained by dropping the voltage of the input node N11 by the forward voltage of the diode D1 is applied to one end of the primary coil L1, but it approximates that of the generation voltage Vo of the solar cell 1. it can.
  • the transistor Q2 whose collector and emitter are connected to the other end of the primary coil L1 and the input node N12, respectively, determines the amount of current flowing through the primary coil L1 in response to the control signal S2 applied to the base. Control.
  • a capacitor C1 is connected between one end of the primary coil L1 and the input node N12.
  • a voltage obtained by boosting the generated voltage Vo is generated based on the value of the discharge current of the capacitor C1 flowing through the primary side coil L1 and the transformation ratio of the transformer TR.
  • the voltage generated at both ends of the secondary coil L2 is a capacitance in which one end of the secondary coil L2 and the output node N21 are connected between the diode D2 connected to the anode and the cathode, respectively, and the output node N21 / N22. Smoothed by C2 and output as a boosted voltage Vbst between the output nodes N21 / N22.
  • the inverter 22 is a general circuit that converts the boosted voltage Vbst output from the DC / DC converter 21 into a three-phase AC voltage Vac.
  • the frequency of the three-phase AC voltage Vac is set by a control signal S3 output from the control circuit 23.
  • the motor M included in the compressor 31 is driven by the three-phase AC voltage Vac, and drives the compressor 31 at a rotational speed determined by the frequency of the three-phase AC voltage Vac and the configuration of the motor M.
  • the DC / DC converter 21 further includes an input voltage measurement circuit VM1 that outputs the voltage between the pair of input nodes N11 / N12 as the measurement voltage V1, and a voltage between the pair of output nodes N21 / N22 as the measurement voltage V2.
  • An output voltage measuring circuit VM2 for output and an input impedance control circuit ZIN including a resistor R1 and a transistor Q1 connected in series between a pair of input nodes N11 / N12 are provided.
  • the control circuit 23 decreases the duty ratio of the control signal S2 and sets the conduction period of the transistor Q2 to be short. By doing so, an excessive increase in the boosted voltage Vbst is suppressed.
  • FIG. 4 is a waveform diagram and a characteristic diagram for explaining the operation of the power supply device 2 included in the refrigeration cycle apparatus 100 according to the first embodiment.
  • FIG. 4A is a waveform diagram for explaining operations of the input impedance control circuit ZIN and the input voltage measurement circuit VM1 included in the DC / DC converter 21 of FIG.
  • the control signal S2 set to a predetermined duty ratio (T1 / (T1 + T2)) is applied to the base of the transistor Q2 that controls the current of the primary coil L1 of the transformer TR.
  • the transistor Q2 is set in a conductive state over a period T1, and the output current of the solar cell 1 and the discharge current of the capacitor C1 flow through the primary coil L1 of the transformer TR. Over the period T2, the transistor Q2 is set in a non-conductive state, the current supply to the primary coil L1 is stopped, and the capacitor C1 is charged by the solar cell 1.
  • the control circuit 23 sets the control signal S1 to a high level in the period T3 included in the period T2.
  • the input impedance control circuit ZIN connects the resistor R1 between the pair of input nodes N11 / N12 via the transistor Q2.
  • the input impedance of the control circuit 23 decreases, and the solar cell 1 supplies current to the resistor R1 in addition to the charging current of the capacitor C1.
  • the value of the output current of the solar cell 1 in the period T3 is a value obtained by increasing the current value ⁇ I flowing through the resistor R1.
  • the input impedance control circuit ZIN As an input impedance control circuit ZIN, an example in which a resistor R1 is connected between a pair of input nodes N11 / N12 is shown.
  • the input impedance control circuit ZIN is not limited to this configuration, and may be any configuration that can control the input impedance of the DC / DC converter 21.
  • the configuration may be appropriately changed such that the resistor R1 is a variable resistor, the combination of a plurality of resistors is changed, or one of a plurality of resistors having different values is selected.
  • the input impedance control circuit (ZIN) connects the load element (R1) having a predetermined impedance between the pair of input nodes (N11 / N12) in response to the first control signal (S1).
  • the impedance value of the load element (R1) can be selected from a plurality of values.
  • FIG. 4B is a characteristic diagram showing changes in the generated power P of the solar cell 1 in the periods T1 and T3. The horizontal axis indicates the generated voltage Vo of the solar cell 1, and the vertical axis indicates the generated power P of the solar cell 1.
  • the control circuit 23 uses the value near the maximum power point voltage Vm as the input voltage setting value of the DC / DC converter 21, and the output current of the solar cell 1 so that the generated voltage Vo of the solar cell 1 maintains the input voltage setting value. To control.
  • the generated voltage Vo and the generated power P of the solar cell 1 in the period T1 are Vo (T1) and P (T1), respectively.
  • the generated voltage Vo and the generated power P of the solar cell 1 in the period T3 are set to Vo (T3) and P (T3), respectively.
  • the power generation voltages Vo (T1) and Vo (T3) are obtained as values of the measurement voltage V1 output by the input voltage measurement circuit VM1 in the periods T1 and T3, respectively.
  • the maximum power point voltage Vm is a value around 19 V corresponding to 80% of the rated voltage of the solar cell 1.
  • the input voltage set value is set in the vicinity of 80% of the rated output voltage value of the solar cell 1 to be connected to the pair of input nodes N11 / N12.
  • the generated voltage Vo (T1) in the period T1 is on the right side of the maximum power point voltage Vm, that is, the generated voltage Vo (T1) is When larger than the maximum power point voltage Vm, the generated voltage Vo in the period T1 and the period T3 changes as follows.
  • the value of the generated voltage Vo (T1) is obtained as the measured voltage V1 of the input voltage measuring circuit VM1 during the period T1, that is, the period during which the transformer TR performs the boosting operation of the generated voltage Vo.
  • the value of the generated voltage Vo (T3) in the period T3 is smaller than the value of the generated voltage Vo (T1).
  • This change in the generated voltage Vo is due to the fact that the value of the output current of the solar cell 1 in the period T3 increases by a current value ⁇ I than the value of the output current of the solar cell 1 in the period T1.
  • the solar cell 1 When the value of the generated voltage Vo (T3) is equal to or greater than the maximum power point voltage Vm, in particular, when the generated voltage Vo (T1) and the generated voltage Vo (T3) are greater than the maximum power point voltage Vm, the solar cell 1 It can be seen that there is a margin for increasing the current supplied to the DC converter 21.
  • the control circuit 23 increases the frequency of the AC voltage Vac generated by the inverter 22 by the control signal S3, and increases the value of the output current of the solar cell 1. As the frequency of the AC voltage Vac increases, the rotational speed of the motor M increases, and the compressor 31 further cools the refrigeration stocker 3.
  • the control circuit 23 maintains the current rotational speed of the motor M, thereby maintaining the output current value of the solar cell 1 and maintaining the cooling state of the refrigeration stocker 3.
  • the control circuit 23 decreases the frequency of the AC voltage Vac generated by the inverter 22 by the control signal S3, and sets the rotation speed of the motor M to the minimum value.
  • the control circuit 23 stops the rotation of the motor M.
  • the solar cell 1 under cloudy weather has a lower generated power P than the solar cell 1 under clear sky.
  • the influence of the decrease in the generated power P under cloudy weather becomes prominent when the value of the generated voltage Vo (T3) is smaller than the maximum power point voltage Vm or in the case of 2) in the situation of 1) described above. .
  • the control circuit 23 controls the rotational speed of the motor M to be lower in consideration of the amount of decrease in the generated voltage Vo (T3) with respect to the generated voltage Vo (T1).
  • FIG. 4A shows an example in which the period T3 is set for each period T2.
  • the period T3, that is, the timing for activating the input impedance control circuit ZIN is not limited to the timing shown in FIG.
  • the period T3 may be set once for a plurality of times of the period T2. By changing the setting frequency of the period T3, it is possible to change the control frequency of the rotation speed of the motor M.
  • control circuit (23) is configured such that the voltage value (V1) between the pair of input nodes (N11 / N12) for each period (T3) in which the first switch (Q2) is set in the non-conductive state, A third control signal (S3) is generated based on a voltage value between a pair of input nodes at a plurality of times during a period in which one switch is set in a non-conductive state.
  • the control circuit 23 sets the value of the generated voltage Vo in the period T1 in which the transformer TR performs the boosting operation and the generated voltage in the period T3 in which the output current of the solar cell 1 is increased by the current value ⁇ I. Based on the magnitude relationship between the value of Vo and the value of the maximum power point voltage Vm of the solar cell 1, the frequency of the AC voltage generated by the inverter 22 is controlled.
  • the refrigeration cycle apparatus 100 can make maximum use of the power generation capacity of the solar cell 1.
  • the control circuit 23 decreases or sets the frequency of the AC voltage generated by the inverter 22 to zero. Thereby, the system down of the refrigerating cycle apparatus 100 resulting from the fall of the power generation voltage Vo of the solar cell 1 is avoided.
  • Control of the input impedance of the DC / DC converter 21 is performed in a period T3 when the transformer TR is not boosting the power generation voltage Vo of the solar cell 1.
  • the generated voltage Vo when the output current of the solar cell 1 is increased by the current value ⁇ I without affecting the boosting operation of the DC / DC converter 21.
  • the increase / decrease width of the rotation speed of the motor M can be set finely. Thereby, the error between the power generation voltage Vo of the solar battery and the input voltage set value is reduced, and the operation of the refrigeration cycle apparatus 100 is stabilized.
  • the refrigeration stocker 3 provided in the refrigeration cycle apparatus 100 has a cold insulating agent 32.
  • the power supply device 2 adjusts the rotational speed of the motor M included in the compressor 31 to maximize the power generation capacity of the solar cell 1, and the compressor 31 stably cools the refrigeration stocker 3 and the cold insulation agent 32.
  • the internal temperature of the refrigeration stocker 3 maintains the cooling state by the cold insulation agent 32 cooled to the refrigeration state.
  • the refrigeration stocker (3) stores the cryogen (32). Even when the weather conditions suddenly change from sunny to cloudy in the daytime and the power generation capacity of the solar cell 1 decreases, the cold insulation agent 32 that is sufficiently cooled by the power of the solar cell 1 during sunny weather causes However, the inside temperature of the refrigeration stocker 3 is sufficiently cooled. Therefore, the refrigeration cycle apparatus 100 having a stable cooling function with the power of the solar battery 1 is realized without using an expensive storage battery.
  • FIG. 5 is a configuration diagram of the refrigeration cycle apparatus 101 according to the second embodiment.
  • FIG. 5 the same reference numerals as those in FIG. 1 have the same configuration, and redundant explanations thereof are omitted.
  • the refrigeration cycle apparatus 101 is obtained by adding an AC adapter (AC / DC conversion adapter) 4, a protection diode D51, and a protection diode D52 to the refrigeration cycle apparatus 100 shown in FIG.
  • the AC adapter 4 is an auxiliary power source, and converts commercial AC power supplied via the plug 6 into a DC voltage set to a desired voltage value and outputs it.
  • the AC adapter 4 supplies a DC voltage to the power supply device 2 instead of the solar cell 1 when the rainy day continues.
  • the DC / DC converter 21 has power supply detection means (not shown).
  • the power source detection unit When detecting that the power generation voltage Vo of the solar cell 1 is lower than the power source switching determination voltage, the power source detection unit switches the power source that supplies the DC voltage to the DC / DC converter 21 from the solar cell 1 to the AC adapter 4.
  • the power source detection unit switches the power source that supplies the DC voltage to the DC / DC converter 21 from the AC adapter 4 to the solar cell 1.
  • the power supply switching determination voltage is set to a voltage value lower than 80% of the rated voltage of the solar cell 1, that is, a voltage corresponding to the maximum power point voltage Vm.
  • the maximum power point voltage Vm of the solar cell 1 is assumed to be around 19V, the value of the DC voltage of the AC adapter 4 is set to 12V, for example.
  • the refrigeration cycle apparatus (101) further includes an AC / DC conversion adapter (4) that outputs a DC output voltage, and the DC output voltage is applied to a pair of input nodes (N11 / N12).
  • the power supply circuit unit (2) When the generated voltage (Vo) falls below the power supply switching determination voltage, the power supply circuit unit (2) applies a DC output voltage to the pair of input nodes (N11 / N12) instead of the generated voltage.
  • the power supply device 2 can supply a DC voltage from the AC adapter 4 in addition to the solar cell 1, and the operation of the refrigeration cycle apparatus 101 in an environment where an AC power supply to the AC adapter 4 is available is more stable.
  • the power supply switching determination voltage By setting the power supply switching determination voltage to a voltage value lower than the voltage corresponding to the maximum power point voltage Vm, it is possible to prevent the refrigeration cycle apparatus 101 from being down due to a decrease in the power generation voltage Vo of the solar cell 1. Become.
  • Embodiments of the present invention can be summarized as follows.
  • the power supply circuit part (2) which has a DC / DC converter (21), an inverter (22), and a control circuit (23), and a motor ( M) and a refrigeration stocker (3) whose internal temperature is controlled by the compressor.
  • the control circuit includes a first control signal (S1) and a second control signal (S2). And a third control signal (S3), and the DC / DC converter generates a pair of input nodes (N11 / N12) to which a power generation voltage (Vo) of a solar cell is applied, and the first control signal.
  • an input impedance control circuit for controlling the input impedance of the DC / DC converter, and a boosted voltage (Vb) obtained by boosting the generated voltage in response to the second control signal.
  • st and a pair of output nodes (N21 / N22) from which the boosted voltage is output, and the inverter responds to the third control signal in response to the boosted voltage.
  • Vac AC voltage
  • the motor is driven by the AC voltage
  • the control circuit is configured to output a voltage value (V1) of the generated voltage before and after changing the input impedance of the DC / DC converter. ) To control the frequency of the AC voltage so as to maintain the generated voltage at the input voltage set value.
  • the power supply device 2 adjusts the rotational speed of the motor M included in the compressor 31 to maximize the power generation capacity of the solar cell 1 according to changes in weather conditions and sunshine conditions. Thereby, the compressor 31 can cool the refrigeration stocker 3 and the cold insulating agent 32 stably. Therefore, the refrigeration cycle apparatus 100 having a stable cooling function with the power of the solar battery 1 is realized without using an expensive storage battery.
  • Embodiment 1 In the control circuit (23), the value of the generated voltage (Vo) before and after the input impedance change of the DC / DC converter is larger than the input voltage setting value.
  • Embodiment 1 In the control circuit (23), the value of the generated voltage (Vo) before and after the input impedance change of the DC / DC converter is smaller than the input voltage setting value.
  • Control circuit 23 reduces or sets the frequency of AC voltage Vac generated by inverter 22 to zero. Thereby, it is possible to avoid a system down of the refrigeration cycle apparatus 100 due to a decrease in the generated voltage of the solar cell 1.
  • Embodiment 1 (Supplementary Note 4) As Embodiment 1 In the case where the control circuit (23) has the input voltage set value between the values of the generated voltage (Vo) before and after the input impedance change of the DC / DC converter, The refrigeration cycle apparatus according to appendix 1, which maintains the frequency of the AC voltage.
  • the transformer (TR) includes a primary coil (L1) electrically connected to a high potential side input node (N11) of the pair of input nodes, and the pair A secondary coil (L2) electrically connected to the high potential side output node (N21) of the output node of the output node, and the DC / DC converter (21) is responsive to the second control signal
  • the input impedance control circuit includes a first switch (Q2) for controlling current supply to the primary side coil, and the input impedance control circuit includes the DC / DC in a period (T3) in which the first switch is set in a non-conductive state.
  • the input impedance of the converter is lowered, and the control circuit is configured to perform a period before a period (T1) in which the first switch is set to a conductive state and a period (T3) in which the first switch is set to a non-conductive state.
  • the refrigeration cycle apparatus according to any one of appendix 2 to appendix 4, wherein the third control signal is generated based on a voltage value (V1) between the pair of input nodes.

Abstract

Selon l'invention, une batterie de stockage non onéreuse est nécessaire afin de maintenir une capacité de refroidissement jour et nuit dans un dispositif à cycle de réfrigération qui emploie une batterie solaire en tant que source de puissance. Ce dispositif à cycle de réfrigération (100) comprend : une unité de circuit de source de puissance (2) qui amplifie la tension (Vo) générée par une batterie solaire (1), et qui génère une tension alternative (Vac) ayant une fréquence prédéterminée ; et un dispositif de stockage de réfrigération (3) dans lequel la température interne est commandée par un compresseur (31). L'unité de circuit de source de puissance commande la fréquence de la tension alternative à fournir à un moteur (M) du compresseur afin de maintenir la tension (Vo) générée par la batterie solaire à une valeur de réglage de tension d'entrée.
PCT/JP2014/054529 2013-06-21 2014-02-25 Dispositif à cycle de réfrigération WO2014203561A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201480034940.0A CN105324926B (zh) 2013-06-21 2014-02-25 冷冻循环装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-130845 2013-06-21
JP2013130845A JP5554866B1 (ja) 2013-06-21 2013-06-21 冷凍サイクル装置

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US11611220B2 (en) 2015-12-31 2023-03-21 Present Power Systems, Llc Systems and methods for connecting energy sources to power distribution network

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