JP5554866B1 - Refrigeration cycle equipment - Google Patents

Refrigeration cycle equipment Download PDF

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JP5554866B1
JP5554866B1 JP2013130845A JP2013130845A JP5554866B1 JP 5554866 B1 JP5554866 B1 JP 5554866B1 JP 2013130845 A JP2013130845 A JP 2013130845A JP 2013130845 A JP2013130845 A JP 2013130845A JP 5554866 B1 JP5554866 B1 JP 5554866B1
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control circuit
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control signal
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JP2015006098A (en
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治彦 村上
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シャープ株式会社
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plant or systems
    • F25B49/025Motor control arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-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
    • F24F5/0046Air-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
    • F24F2005/0064Air-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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-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
    • F24F5/0046Air-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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/02Compressor control
    • F25B2600/021Inverters therefor
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion 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
    • H02M7/4807Conversion 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies
    • Y02B30/74Technologies based on motor control
    • Y02B30/741Speed regulation of the compressor
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion electric or electronic aspects

Abstract

In a refrigeration cycle apparatus that uses a solar battery as a power source, an expensive storage battery is required to maintain cooling capacity day and night.
A refrigeration cycle apparatus (100) boosts a power generation voltage (Vo) of a solar cell (1) to generate an AC voltage (Vac) having a predetermined frequency, a compressor ( 31) and a refrigeration stocker (3) whose internal temperature is controlled. The power supply circuit unit controls the frequency of the AC voltage supplied to the motor (M) of the compressor so that the power generation voltage (Vo) of the solar cell is maintained at the input voltage set value.
[Selection] Figure 1

Description

  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.

  In a non-power supply area or an area where power supply is unstable, a solar battery and a storage battery are used as a power supply device for a refrigeration cycle apparatus using a refrigeration cycle such as a freezer. By storing DC power generated by the solar cell in the daytime in the battery and operating the compressor with the power of the storage battery at night, the freezer can be kept cold throughout the day and night. However, expensive storage batteries are an obstacle to the spread of such refrigeration cycle devices.

  Patent Document 1 can be operated due to fluctuations in power demand and heat demand, and it is possible to use power generation and waste heat by combining heat generation by a gas turbine that can respond to fluctuations in power demand and heat demand and heat generation by a fuel cell. A thermoelectric supply system is disclosed.

  Patent document 2 drives the compressor and the cool / heat generator with the electric power obtained by the solar power generator, and the cold / heat generated by the cool / heat generator generates a fluid having a large specific heat in the heat insulation container. Disclosed is a solar power generation high-efficiency cooling / heating device that is temporarily stored in the device.

JP 2010-133427 A Japanese Patent Laid-Open No. 6-101931

  In a refrigeration cycle apparatus that uses a solar battery as a power source, an expensive storage battery is required to maintain the cooling capacity day and night.

  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; And 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 driven by the AC voltage. Is, 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 value, controls the frequency of the AC voltage.

  ADVANTAGE OF THE INVENTION According to this invention, the refrigerating-cycle apparatus which can be stably operated with a solar cell is implement | achieved, without using an expensive storage battery.

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 characteristic diagram explaining operation | movement of the power supply device with which the refrigeration cycle apparatus which concerns on Embodiment 1 is provided. 3 is a configuration diagram of a refrigeration cycle apparatus according to Embodiment 2. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the embodiments, when the number, amount, or the like is referred to, the scope of the present invention is not necessarily limited to the number, amount, or the like unless otherwise specified. In the drawings of the embodiments, the same reference numerals and reference numerals represent the same or corresponding parts. Further, in the description of the embodiments, the overlapping description may not be repeated for the portions with the same reference numerals and the like.

<Embodiment 1>
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.

As an example, 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). . In the case of the solar cell 1 rated at 24V, 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. In FIG. 2, 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 power supply device 2 included in refrigeration cycle apparatus 100 according to Embodiment 1.

  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 side coil L1 and a secondary side 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. Precisely, 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. When the transistor Q2 is set to a conductive state, a discharge current is supplied to the primary coil L1 from the capacitor C1 charged with the power generation voltage Vo of the solar cell 1.

  A voltage obtained by boosting the generated voltage Vo is generated at both ends of the secondary coil L2 based on the value of the discharge current of the capacitor C1 flowing in the primary 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. When the measurement voltage V2 of the output voltage measurement circuit VM2 exceeds the maximum value (for example, 300 V) of the boost voltage Vbst, 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 power supply device 2 included in refrigeration cycle apparatus 100 according to Embodiment 1.

  FIG. 4A is a waveform diagram illustrating operations of the input impedance control circuit ZIN and the input voltage measurement circuit VM1 included in the DC / DC converter 21 of FIG. As described above, 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. In FIG. 4, 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 (see FIG. 3) sets the control signal S1 to a high level in the period T3 included in the period T2. In response to the control signal S1, the input impedance control circuit ZIN connects the resistor R1 between the pair of input nodes N11 / N12 via the transistor Q2. When the resistor R1 is connected between the pair of input nodes N11 / N12, 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. With respect to the output current of the solar cell 1 in the period T1, the value of the output current of the solar cell 1 in the period T3 is a value obtained by increasing the current value ΔI flowing through the resistor R1.

  As the 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. For example, 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.

  That is, 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 generated voltage Vo of the solar cell 1 is desirably set on the right side of the maximum power point voltage Vm. This is because when the operating point of the solar cell 1 is on the left side of the maximum power point voltage Vm, there is a concern about system down due to a decrease in the generated voltage Vo as the output current of the solar cell 1 increases. In order to make maximum use of the power generation capacity of the solar cell 1, it is more desirable to set the power generation voltage Vo in the vicinity of the maximum power point voltage Vm. 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.

  Let the generated voltage Vo and the generated power P of the solar cell 1 in the period T1 be 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. Here, 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. As illustrated in FIG. 2, the maximum power point voltage Vm is a value around 19 V corresponding to 80% of the rated voltage of the solar cell 1.

  That is, the input voltage setting value is set to be approximately 80% of the rated output voltage value of the solar cell 1 to be connected to the pair of input nodes N11 / N12.

  Hereinafter, a change in the generated voltage Vo of the solar cell 1 when the input impedance of the DC / DC converter 21 is changed by the input impedance control circuit ZIN will be described.

1) When the operating point of the solar cell 1 is on the right side of the peak of the generated power P When 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 ΔI than the value of the output current of the solar cell 1 in the period T1.

  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. In this case, 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.

  When the value of the generated voltage Vo (T3) in the period T3 is smaller than the maximum power point voltage Vm, that is, when the maximum power point voltage Vm is between the generated voltage Vo (T1) and the generated voltage Vo (T3). It can be seen that the solar cell 1 is operating near the maximum power point voltage Vm. In this case, 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.

2) When the operating point of the solar cell 1 is on the left side of the peak of the generated power P When the generated voltage Vo (T1) in the period T1 is on the left side of the maximum power point voltage Vm, that is, the generated voltage Vo (T1) When the value is smaller than the maximum power point voltage Vm, the generated voltage Vo (T3) is also smaller than the value of the maximum power point voltage Vm. 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 ΔI than the value of the output current of the solar cell 1 in the period T1.

  In this case, in order to avoid the system down of the refrigeration cycle apparatus 100, it is necessary to reduce the current supplied from the solar cell 1 to the DC / DC converter 21. 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. When the generated voltage Vo (T1) in the period T1 after the next time further decreases, 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. . In those cases, 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.

  That is, the 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 effect of the refrigeration cycle apparatus 100 according to Embodiment 1 will be described.
In the power supply device 2 provided in the refrigeration cycle apparatus 100, 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 ΔI. Based on the magnitude relationship between the value of Vo and the value of the maximum power point voltage Vm of the solar battery 1, the frequency of the AC voltage generated by the inverter 22 is controlled.

  By controlling the frequency of the alternating voltage generated by the inverter 22, the value of the output current of the solar cell 1 increases or decreases, and the generated voltage Vo of the solar cell 1 is the maximum power point with respect to changes in weather conditions and sunshine conditions. It is maintained near the voltage Vm. Thereby, the refrigeration cycle apparatus 100 can make maximum use of the power generation capacity of the solar cell 1.

  When the value of the generated voltage Vo in the period T1 is smaller than the maximum power point voltage Vm 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. As a result, it is possible to measure the generated voltage Vo when the output current of the solar cell 1 is increased by the current value ΔI without affecting the boosting operation of the DC / DC converter 21.

  By setting the input impedance value of the DC / DC converter 21 in multiple stages by the input impedance control circuit ZIN, the increase / decrease width of the rotational 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 included in the refrigeration cycle apparatus 100 includes 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. On the other hand, at the night when the power generation capacity of the solar cell 1 disappears, the internal temperature of the refrigeration stocker 3 maintains the cooling state by the cold insulation agent 32 cooled to the refrigeration state.

That is, 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.

<Embodiment 2>
FIG. 5 is a configuration diagram of the refrigeration cycle apparatus 101 according to the second embodiment.

  In 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). 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. When the power generation voltage Vo of the solar cell 1 becomes larger 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 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. As in Embodiment 1, when 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.

  That is, 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).

  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. 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.
(Additional remark 1) As Embodiment 1, it is a refrigerating-cycle apparatus (100), Comprising: The power supply circuit part (2) which has a DC / DC converter (21), an inverter (22), and a control circuit (23), 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. In response, an input impedance control circuit (ZIN) 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. Is converted into an AC voltage (Vac) having a predetermined frequency, the motor is driven by the AC voltage, and 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.

(Effects corresponding to Appendix 1)
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.

(Supplementary Note 2) As 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. In the case, the refrigeration cycle apparatus according to appendix 1, wherein the third control signal is set so as to increase the frequency of the AC voltage.

(Effects corresponding to Appendix 2)
When the solar cell 1 has a margin for increasing the current supplied to the DC / 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. As the frequency of the AC voltage Vac increases, the motor M increases the rotation speed, and the compressor 31 further cools the refrigeration stocker 3.

(Supplementary Note 3) As 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. In this case, the refrigeration cycle apparatus according to appendix 1, wherein the third control signal is set so as to decrease the frequency of the AC voltage Vac.

(Effects corresponding to Appendix 3)
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.

(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.

(Effects corresponding to Appendix 4)
When the solar cell 1 is operating in the vicinity of the maximum power point voltage Vm, the control circuit 23 maintains the current rotation speed of the motor M, thereby continuing the cooling state of the refrigeration stocker 3.

(Supplementary Note 5) As Embodiment 1 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.

(Effects corresponding to Appendix 5)
Confirmation of the operating point of the solar cell 1 and control of the rotational speed of the motor M are possible without affecting the boosting operation of the DC / DC converter 21.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Solar cell, 2 Power supply device, 3 Refrigeration stocker, 4 Adapter, 6 Plug, 21 DC / DC converter, 22 Inverter, 23 Control circuit, 31 Compressor, 32 Coolant, 100, 101 Refrigeration cycle apparatus, C1, C2 capacity, D1, D2 diode, D51, D51 protection diode, GND1, GND2 ground voltage, L1 primary side coil, L2 secondary side coil, N11, N12 input node, N21, N22 output node, Q1, Q2 transistor, R1 resistor, S1 ~ S3 control signal, T1-T3 period, TR transformer, V1, V2 measurement voltage, Vac AC voltage, Vbst boost voltage, Vm Maximum power point voltage, VM1, VM2 input voltage measurement circuit, Vo power generation voltage, ZIN input impedance control circuit .

Claims (5)

  1. A refrigeration cycle apparatus,
    A power supply circuit unit having a DC / DC converter, an inverter, and a control circuit;
    A compressor having a motor;
    A freezer stocker whose internal temperature is controlled by the compressor;
    With
    The control circuit generates a first control signal, a second control signal, and a third control signal,
    The DC / DC converter is:
    A pair of input nodes to which the generated voltage of the solar cell is applied;
    An input impedance control circuit for controlling an input impedance of the DC / DC converter in response to the first control signal;
    A transformer for generating a boosted voltage obtained by boosting the generated voltage in response to the second control signal;
    A pair of output nodes from which the boosted voltage is output;
    Including
    In response to the third control signal, the inverter converts the boosted voltage to an AC voltage having a predetermined frequency,
    The motor is driven by the AC voltage;
    The control circuit controls the frequency of the AC voltage so as to maintain the generated voltage at an input voltage set value based on the voltage value of the generated voltage before and after changing the input impedance of the DC / DC converter. Cycle equipment.
  2.   When the value of the generated voltage before and after the change of the input impedance of the DC / DC converter is higher than the input voltage setting value, the control circuit increases the frequency of the AC voltage so as to increase the frequency of the AC voltage. The refrigeration cycle apparatus according to claim 1, wherein a control signal is set.
  3.   The control circuit is configured to reduce the frequency of the AC voltage when the value of the generated voltage before and after the input impedance change of the DC / DC converter is smaller than the input voltage setting value. The refrigeration cycle apparatus according to claim 1, wherein a control signal is set.
  4.   The refrigeration according to claim 1, wherein the control circuit maintains the frequency of the AC voltage when the input voltage setting value is between the values of the generated voltage before and after the input impedance change of the DC / DC converter. Cycle equipment.
  5. The transformer includes a primary coil electrically connected to a high potential side input node of the pair of input nodes, and a secondary electrically connected to a high potential side output node of the pair of output nodes. Having side coils,
    The DC / DC converter includes a first switch that controls current supply to the primary coil in response to the second control signal;
    The input impedance control circuit reduces the input impedance of the DC / DC converter in a period in which the first switch is set in a non-conductive state,
    The control circuit includes the third control signal based on a voltage value between the pair of input nodes in a period in which the first switch is set in a conductive state and a period in which the first switch is set in a non-conductive state. The refrigeration cycle apparatus according to any one of claims 2 to 4, wherein
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JP2004312994A (en) * 2003-03-27 2004-11-04 Tokyo Rika Daigaku Kagaku Gijutsu Koryu Center Power conditioner for passive generator output system
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