WO2018196415A1 - 太阳能直流变换器、供电控制方法、空调供电系统 - Google Patents

太阳能直流变换器、供电控制方法、空调供电系统 Download PDF

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Publication number
WO2018196415A1
WO2018196415A1 PCT/CN2017/118111 CN2017118111W WO2018196415A1 WO 2018196415 A1 WO2018196415 A1 WO 2018196415A1 CN 2017118111 W CN2017118111 W CN 2017118111W WO 2018196415 A1 WO2018196415 A1 WO 2018196415A1
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Prior art keywords
solar
diode
transformer
output
circuit
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PCT/CN2017/118111
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English (en)
French (fr)
Inventor
许敏
张有林
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Gree Electric Appliances Inc of Zhuhai
Gree Wuhan Electric Appliances Co Ltd
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Gree Electric Appliances Inc of Zhuhai
Gree Wuhan Electric Appliances Co Ltd
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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
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • 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
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33538—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only of the forward type
    • H02M3/33546—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only of the forward type with automatic control of the output voltage or current
    • H02M3/33553—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only of the forward type with automatic control of the output voltage or current with galvanic isolation between input and output of both the power stage and the feedback loop
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • 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

Definitions

  • the present application relates to the field of solar power supply technology, and in particular, to a solar DC converter, a power supply control method, and an air conditioning power supply system.
  • the panels are usually divided into groups to form sets of solar power inputs having different parameters such as voltage or capacity. Therefore, a multi-input DC converter is required.
  • a plurality of power converters corresponding to multiple input solar power sources are used in the industry, and the cost is high.
  • the present application provides a solar DC converter, a power supply control method, and an air conditioning power supply system, in order to solve at least a plurality of power converters in the prior art, a plurality of power converters respectively corresponding to multiple input solar battery power sources are required. The problem that makes the cost higher.
  • the present application provides a solar DC converter, including:
  • a first solar output control circuit the input end being connected to the output end of the first solar panel for controlling the output of the first solar panel
  • a second solar output control circuit the input end being connected to the output end of the second solar panel for controlling the output of the second solar panel
  • the transformer isolated power conversion circuit has an input end connected to an output end of the first solar output control circuit and an output end of the second solar output control circuit, and the output end is connected to the load for supplying power to the load.
  • the first solar energy output control circuit comprises:
  • the positive pole is connected to the positive pole of the first solar panel, the first end of the negative pole is connected to the first input end of the transformer circuit through a first absorption loop, and the second end of the negative pole is connected to the second input end of the transformer, wherein
  • the first absorption circuit is for suppressing a voltage stress generated by a leakage inductance in the circuit;
  • the first MOS transistor has a drain connected to the first input end of the transformer circuit, and a source connected to the negative pole of the first solar panel for controlling whether the first solar panel is powered or not.
  • the first absorption circuit comprises:
  • first end is respectively connected to the first end of the first resistor and the negative end of the first diode, and the second end is connected to the second end of the first resistor;
  • the seventh diode is connected to the second end of the first resistor and the second end of the first capacitor, respectively; the positive pole is respectively connected to the drain of the first MOS transistor and the first input end of the transformer circuit.
  • the second solar output control circuit comprises:
  • the positive pole is connected to the positive pole of the second solar panel
  • the first end of the negative pole is connected to the second input end of the transformer circuit through the second absorption loop
  • the second end of the negative pole is connected to the first input end of the transformer, wherein
  • the second absorption circuit is for suppressing a voltage stress generated by a leakage inductance in the circuit
  • the second MOS transistor has a drain connected to the second input end of the transformer circuit, and a source connected to the negative pole of the second solar panel for controlling whether the second solar panel is powered or not.
  • the second absorption loop comprises:
  • the first end is respectively connected to the first end of the second resistor and the cathode of the second diode, and the second end is connected to the second end of the second resistor;
  • the eighth diode is connected to the second end of the second resistor and the second end of the second capacitor, respectively; the positive pole is respectively connected to the drain of the second MOS transistor and the second input end of the transformer circuit.
  • transformer isolated power conversion circuit includes:
  • a bridge rectifier circuit composed of a third diode, a fourth diode, a fifth diode, and a sixth diode, wherein a positive pole of the third diode is connected to a second output end of the transformer, and the anode and the The anode of the fourth diode is connected; the anode of the fourth diode is connected to the cathode of the sixth diode and is connected to the first output of the transformer; the cathode of the fifth diode is connected to the anode of the third diode The positive pole is connected to the anode of the sixth diode and is connected to the second output end of the transformer isolation power conversion circuit;
  • the first end is connected to the negative poles of the third diode and the fourth diode, and the second end is connected to the first output end of the transformer isolation power conversion circuit;
  • the third capacitor is connected to the first output end of the transformer isolation power conversion circuit, and the second end is connected to the second output end of the transformer isolation power conversion circuit.
  • transformer isolated power conversion circuit includes:
  • the negative electrode is connected to the second output end of the transformer, and the positive output and the transformer are isolated from the second output end of the power conversion circuit;
  • the positive pole is connected to the anode of the ninth diode, and is connected to the second output end of the transformer isolation power conversion circuit, and the anode is connected to the first output end of the transformer;
  • the first end is respectively connected to the second output end of the transformer and the negative end of the ninth diode, and the second end is separated from the first output end of the power conversion circuit by the transformer;
  • the first end is respectively connected to the tenth diode negative electrode and the first output end of the transformer, and the second end is connected to the second end of the second inductor;
  • the fourth capacitor is connected to the first output end of the transformer isolation power conversion circuit, and the second end is connected to the second output end of the transformer isolation power conversion circuit.
  • an air conditioning power supply system including the above-described solar DC converter, a first solar panel, a second solar panel, and an air conditioning unit, wherein the first solar panel, the first The two solar panels supply power to the air conditioning unit through a solar DC converter.
  • a power supply control method for powering by the solar power converter wherein the first solar panel is controlled by the first solar output control circuit and the second solar output control circuit, respectively The output of the two solar panels is turned on and off to realize that the first solar panel and the second solar panel supply power to the load in a time-sharing manner.
  • independent maximum power tracking control is performed during the power supply process of the first solar panel and the second solar panel.
  • the first solar output control circuit and the second solar output control circuit are provided to realize time-sharing control of different voltage solar battery groups, and at the same time, by setting the input terminals respectively A transformer isolated power conversion circuit connected to an output end of the first solar output control circuit and an output end of the second solar output control circuit, completing a transformer to realize input of two different voltage solar battery groups, and the solar DC converter of the structure is effective
  • it is necessary to adopt a plurality of power converters respectively corresponding to the multi-input solar battery power source which has a high cost and reduces the equipment cost of the solar power input.
  • FIG. 1 is an optional structural block diagram of a solar DC converter according to an embodiment of the present application.
  • FIG. 2 is an alternative circuit configuration diagram of a solar DC converter according to an embodiment of the present application.
  • FIG. 3 is another alternative circuit configuration diagram of a solar DC converter according to an embodiment of the present application.
  • FIG 4 is an optional structural block diagram of an air conditioning power supply system according to an embodiment of the present application.
  • FIG. 1 shows an optional structural block diagram of a solar DC converter. As shown in FIG. 1, the solar DC converter includes the following parts:
  • a first solar output control circuit 101 the input end being connected to the output end of the first solar panel 10 for controlling the output of the first solar panel 10;
  • a second solar output control circuit 102 the input end is connected to the output end of the second solar panel 11 for controlling the output of the second solar panel 11;
  • the transformer isolated power conversion circuit 103 has an input end connected to an output end of the first solar output control circuit and an output end of the second solar output control circuit, and an output end connected to the load for supplying power to the load 20.
  • the first solar output control circuit 101 and the second solar output control circuit 102 are disposed, Time-division control of different voltage solar cells, and a transformer isolation power conversion circuit 103 connected to the output of the first solar output control circuit 101 and the output of the second solar output control circuit 102, respectively, is provided to complete one
  • the transformer can realize the input of two different voltage solar battery groups.
  • the solar DC converter of this structure effectively solves the problem that multiple power converters need corresponding multiple input solar energy when powering multiple solar panels in the prior art. Battery power, the problem of higher cost, reduces the cost of equipment for solar power input.
  • FIG. 2 shows an optional circuit connection diagram of the above-mentioned solar DC converter, as shown in FIG. 2, which is a power supply scheme including two solar panels of S11 and S21, and the first solar energy output is specifically set when the circuit is set.
  • the control circuit 101 includes:
  • the positive pole is connected to the positive pole of the first solar panel S11
  • the first end of the negative pole is connected to the first input end of the transformer circuit through the first absorption loop
  • the second end of the negative pole is connected to the second input end of the transformer.
  • the first absorption circuit includes: a first resistor R11, the first end is connected to the cathode of the first diode D12; and the first capacitor C11 has a first end and a first end of the first resistor R11, respectively.
  • the cathode of the first diode D12 is connected, the second end is connected to the second end of the first resistor R11, the seventh diode D11, and the cathode is respectively connected to the second end of the first resistor R11 and the second capacitor C11.
  • the terminal is connected; the positive electrode is respectively connected to the drain of the first MOS transistor MOS11 and the first input end of the transformer circuit.
  • the first absorption circuit is for suppressing a voltage stress generated by a leakage inductance in the circuit;
  • the first MOS transistor MOS11 has a drain connected to the first input end of the transformer circuit, and a source connected to the negative electrode of the first solar panel S11 for controlling whether the first solar panel S11 is powered or not.
  • the second solar output control circuit 102 described above, as shown in FIG. 2, includes:
  • the positive pole is connected to the positive pole of the second solar panel S21
  • the first end of the negative pole is connected to the second input end of the transformer circuit through the second absorption loop
  • the second end of the negative pole is connected to the first input end of the transformer.
  • the second absorption circuit includes: a second resistor R21, the first end is connected to the cathode of the second diode D22; and the second capacitor C21 has a first end and a first end of the second resistor R21 and The second terminal of the diode D22 is connected, the second end is connected to the second end of the second resistor R21, and the eighth diode D21 is respectively connected to the second end of the second resistor R21 and the second end of the second capacitor C21.
  • the positive electrode is connected to the drain of the second MOS transistor MOS21 and the second input terminal of the transformer circuit, respectively.
  • the second absorption circuit is for suppressing a voltage stress generated by a leakage inductance in the circuit;
  • the second MOS transistor MOS21 has a drain connected to the second input end of the transformer circuit, and a source connected to the negative electrode of the second solar panel S21 for controlling whether the second solar panel is powered or not.
  • the transformer isolation power conversion circuit described above is as shown in FIG. 2, and includes:
  • a bridge rectifier circuit composed of a third diode D31, a fourth diode D32, a fifth diode D33, and a sixth diode D34, wherein the anode of the third diode D31 and the second output of the transformer Connected, the negative electrode is connected to the negative electrode of the fourth diode D32; the positive electrode of the fourth diode D32 is connected to the negative electrode of the sixth diode D34, and is connected to the first output end of the transformer; the negative electrode of the fifth diode D33 Connected to the anode of the third diode D31, the anode is connected to the anode of the sixth diode D34, and is connected to the second output end of the transformer isolation power conversion circuit;
  • a first inductor L31 the first end is connected to the cathode of the third diode D31 and the fourth diode D32, and the second end is connected to the first output end of the transformer isolation power conversion circuit;
  • the third capacitor C31 has a first end connected to the first output end of the transformer isolation power conversion circuit, and a second end connected to the second output end of the transformer isolation power conversion circuit.
  • the DC converter shown in Figure 2 is a two-input isolated DC converter, and the two input power transistors are time-divisionally conductive.
  • an absorption circuit is provided on both the input sides of the two transformers.
  • the transformer secondary output winding adopts a bridge topology.
  • the energy of the solar cell S11 is transmitted to the load RL through the primary winding NP1, the magnetic core, the secondary winding NS, and the rectifier diodes D31, D34 and the inductor L31.
  • the other power input winding NP2 has an induced voltage, but since only the absorption loop has one loop, substantially no output power is generated.
  • the power tube MOS11 When the power tube MOS11 is turned off, there is a dynamic process such as the excitation energy in the magnetic core, the energy in the leakage inductance, and the freewheeling of the secondary side inductance, and the conduction process of the freewheeling diode. As the process ends, the converter enters the secondary inductor in the freewheeling phase. Thereafter, the power transistor MOS21 of the other winding circuit is turned on, and the process is the same as described above.
  • the converter operating mode can be divided into an inductor current discontinuous mode DCM, an inductor current continuous mode CCM, and a critical conduction mode CRM.
  • the scheme uses each input power supply to work in time division, and the secondary side inductor current is discontinuous DCM working mode, ie, The secondary side inductor freewheeling current has dropped to zero before the power transistor is turned on (wherein, preferably, the secondary side inductor current value is detected by the current detecting element before turning on).
  • the output power of the solar panel can be obtained according to the detected solar panel power supply voltage and the corresponding current.
  • the duty of the power tube can be dynamically controlled.
  • the output power of the solar panel is always maintained at a maximum value.
  • the power tube duty ratio is the same in a time period, and the average current and voltage of the solar panel are detected. Get the power.
  • the duty cycle of the power tube is adjusted to the duty ratio of the previous period.
  • the duty cycle of the power tube is further increased or decreased according to the trend of the previous period.
  • the reciprocating realization of the solar panel output power is always at the highest point, achieving maximum power tracking MPPT.
  • FIG. 3 shows another optional circuit connection diagram of the above-mentioned solar DC converter
  • FIG. 3 shows a power supply scheme including two solar panels of S11 and S21
  • FIG. 3 shows a power supply scheme including two solar panels of S11 and S21
  • some components have the same reference numerals.
  • the components of the same reference numerals in FIG. 2 and FIG. 3 may be the same or different.
  • the first solar output control circuit 101 described above, as shown in FIG. 3 includes:
  • the positive pole is connected to the positive pole of the first solar panel S11
  • the first end of the negative pole is connected to the first input end of the transformer circuit through the first absorption loop
  • the second end of the negative pole is connected to the second input end of the transformer.
  • the first absorption circuit includes: a first resistor R11, the first end is connected to the cathode of the first diode D12; and the first capacitor C11 has a first end and a first end of the first resistor R11, respectively.
  • the cathode of the first diode D12 is connected, the second end is connected to the second end of the first resistor R11, the seventh diode D11, and the cathode is respectively connected to the second end of the first resistor R11 and the second capacitor C11.
  • the terminal is connected; the positive electrode is respectively connected to the drain of the first MOS transistor MOS11 and the first input end of the transformer circuit.
  • the first absorption circuit is for suppressing a voltage stress generated by a leakage inductance in the circuit;
  • the first MOS transistor MOS11 has a drain connected to the first input end of the transformer circuit, and a source connected to the negative electrode of the first solar panel S11 for controlling whether the first solar panel S11 is powered or not.
  • the second solar output control circuit 102 described above, as shown in FIG. 3, includes:
  • the positive electrode is connected to the positive pole of the second solar panel S21, the first end of the negative pole is connected to the second input end of the transformer circuit through the second absorption loop, and the second end of the negative pole is connected to the first input end of the transformer.
  • the second absorption circuit includes: a second resistor R21, the first end is connected to the cathode of the second diode D22; and the second capacitor C21 has a first end and a first end of the second resistor R21 and The second terminal of the diode D22 is connected, the second end is connected to the second end of the second resistor R21, and the eighth diode D21 is respectively connected to the second end of the second resistor R21 and the second end of the second capacitor C21.
  • the positive electrode is connected to the drain of the second MOS transistor MOS21 and the second input terminal of the transformer circuit, respectively.
  • the second absorption circuit is for suppressing a voltage stress generated by a leakage inductance in the circuit;
  • the second MOS transistor MOS21 has a drain connected to the second input end of the transformer circuit, and a source connected to the negative electrode of the second solar panel S21 for controlling whether the second solar panel is powered or not.
  • the transformer isolation power conversion circuit described above is shown in FIG. 3 and includes:
  • a ninth diode D31 the negative electrode is connected to the second output end of the transformer, and the positive output and the transformer are isolated from the second output end of the power conversion circuit;
  • the positive pole is connected to the anode of the ninth diode D31, and is connected to the second output end of the transformer isolation power conversion circuit, and the anode is connected to the first output end of the transformer;
  • a second inductor L31 the first end is respectively connected to the second output end of the transformer and the negative electrode of the ninth diode D31, and the second end is separated from the first output end of the power conversion circuit by the transformer;
  • a third inductor L32 the first end is respectively connected to the anode of the tenth diode D32 and the first output end of the transformer, and the second end is connected to the second end of the second inductor L31;
  • the fourth capacitor C31 has a first end connected to the first output end of the transformer isolation power conversion circuit, and a second end connected to the second output end of the transformer isolation power conversion circuit.
  • the primary components of the transformer are the same as those in Fig. 2, and the secondary side structure is different.
  • the dual input isolated DC converter of Fig. 2 is mainly used for the case where the output voltage is high, and the dual input of Fig. 3
  • the isolated DC converter is mainly used when the output current is large.
  • the scheme topology as shown in FIG. 3 can be adopted.
  • the primary side circuit topology of the high-frequency transformer is the same as that of Fig. 2, and the secondary side topology adopts two secondary side inductances. In this way, the current of the corresponding side conduction power tube of the primary side can be halved.
  • Inductive current discontinuous conduction mode is also used for control (wherein the conduction of the power transistor MOS11 corresponds to the discontinuous conduction of the secondary inductor L31, and the conduction of the power transistor MOS21 corresponds to the discontinuous conduction of the secondary inductor L32) .
  • the remaining maximum power tracking control is the same as that of Figure 2 and will not be described here.
  • the first solar output control circuit and the second solar output control circuit are provided to realize time-sharing control of different voltage solar battery groups, and at the same time, by setting the input terminals respectively a transformer isolated power conversion circuit connected to an output end of the first solar output control circuit and an output end of the second solar output control circuit, completing a transformer to realize input of two different voltage solar battery cells, the solar DC converter of the structure
  • it is necessary to adopt a plurality of power converters respectively corresponding to the multi-input solar battery power source which has a high cost and reduces the equipment cost of the solar power input.
  • FIG. 4 shows an optional structural block diagram of the air conditioning power supply system.
  • the air conditioning power supply system includes: a solar DC converter 40, a first solar panel 10, a second solar panel 11, and an air conditioning unit 42, a first solar panel 10, and a second solar panel 11.
  • the air conditioning unit 42 is powered by the solar DC converter 40.
  • the structure of the solar DC converter is as described in Embodiment 1 above, and details are not described herein again.
  • the ordinary solar power converter uses two power converters to process two sets of solar panels. In this embodiment, one is used.
  • the power converter implements power supply to two sets of panels.
  • the isolation between the two sets of panels reduces mutual interference and is beneficial for electromagnetic compatibility.
  • a transformer that achieves two sets of isolated solar panel inputs saves cost.
  • the optional embodiment 3 of the present application further provides a power supply control method for supplying power through a solar DC converter, wherein the solar DC converter structure is as in the above embodiment 1.
  • the first solar energy output control circuit and the second solar energy output control circuit respectively control the output of the first solar panel and the second solar panel to turn on and off to realize the first solar cell.
  • the board and the second solar panel supply power to the load in a time-sharing manner.
  • independent maximum power tracking control is performed during the power supply process of the first solar panel and the second solar panel.
  • the output power of the solar panel can be obtained according to the detected solar panel power supply voltage and the corresponding current, and the power tube can be dynamically controlled during the control.
  • the duty cycle of the solar panel keeps the output power of the solar panel at a maximum value.
  • the power tube duty ratio is the same in a period of time, and the average current of the solar panel is detected. With the voltage, get the power.
  • the duty cycle of the power tube is adjusted to the duty ratio of the previous period.
  • the duty cycle of the power tube is further increased or decreased according to the trend of the previous period.
  • the reciprocating realization of the solar panel output power is always at the highest point, achieving maximum power tracking MPPT.
  • the first solar output control circuit and the second solar energy output control circuit are disposed to realize different voltage solar battery groups.
  • Time-sharing control at the same time, by setting a transformer isolation power conversion circuit respectively connected with the output end of the first solar output control circuit and the output end of the second solar output control circuit, completing one transformer to realize two different voltage solar battery groups.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Photovoltaic Devices (AREA)

Abstract

一种太阳能直流变换器、供电控制方法、空调供电系统。该太阳能直流变换器包括第一太阳能输出控制电路（101），输入端与第一太阳能电池板（10）的输出端连接，用于控制第一太阳能电池板的输出；第二太阳能输出控制电路（102），输入端与第二太阳能电池板（11）的输出端连接，用于控制第二太阳能电池板的输出；变压器隔离功率变换电路，输入端分别与第一太阳能输出控制电路的输出端和第二太阳能输出控制电路的输出端连接，输出端用于与负载连接，用以为负载供电。该变换器解决了多个太阳能电池板供电时，各电池板组需要采用多个功率变换器分别对应多个输入的太阳能电池电源、成本较高的问题，降低了太阳能电源输入的设备成本。

Description

[根据细则91更正 02.02.2018]　太阳能直流变换器、供电控制方法、空调供电系统
相关申请
本申请要求2017年04月26日申请的，申请号为201710283421.3，名称为“太阳能直流变换器、供电控制方法、空调供电系统”的中国专利申请的优先权，在此将其全文引入作为参考。
技术领域
本申请涉及太阳能供电技术领域，具体而言，涉及一种太阳能直流变换器、供电控制方法、空调供电系统。
背景技术
目前，在太阳能功率变换装置中，几千瓦等级大都采用不隔离的功率变换方式。采用不隔离的太阳能功率变换器虽然成本、效率上有一定优势但存在对地泄漏电流问题，国内外学者先后从不同角度提出了多种解决系统对地泄漏电流的功率变换拓扑与控制策略，例如有源共模干扰抑制方案，通过电容等检出共模信号，然后经过射极跟随与放大反向后再串入共模回路以抵消共模干扰；以及三相四桥臂方案该方案增加了辅助桥臂，调制上不能使用零矢量，该方案容易使线电压畸变；此外还有H5、H6、HERIC、REFU等拓扑。但这些方案大都增加了成本与系统复杂性。综合对比，有些方案成本反而比隔离方案高。
另外，根据电池板的摆放位置以及电池板特性的差异通常把电池板分成几组，从而形成电压或容量等参数不同的几组太阳能电源输入。因此需要多输入的直流变换器。目前行业上采用多个功率变换器分别对应多输入的太阳能电池电源，成本较高。
针对相关技术中多个太阳能电池板供电时，需要采用多个功率变换器分别对应多输入的太阳能电池电源，使得成本较高的问题，目前尚未提出有效地解决方案。
发明内容
本申请提供了一种太阳能直流变换器、供电控制方法、空调供电系统，以至少解决现有技术中多个太阳能电池板供电时，需要采用多个功率变换器分别对应多输入的太阳能电池电源，使得成本较高的问题。
为解决上述技术问题，根据本公开实施例的一个方面，本申请提供了一种太阳能直流变换器，包括：
第一太阳能输出控制电路，输入端与第一太阳能电池板的输出端连接，用于控制第一太阳能电池板的输出；
第二太阳能输出控制电路，输入端与第二太阳能电池板的输出端连接，用于控制第二太阳能电池板的输出；
变压器隔离功率变换电路，输入端分别与第一太阳能输出控制电路的输出端和第二太阳能输出控制电路的输出端连接，输出端用于与负载连接，用以为负载供电。
进一步地，第一太阳能输出控制电路包括：
第一二极管，正极与第一太阳能电池板的正极连接，负极的第一端通过第一吸收回路与变压器电路第一输入端连接，负极第二端与变压器第二输入端连接，其中，第一吸收回路用于抑制电路中漏感产生的电压应力；
第一MOS管，漏极与变压器电路第一输入端连接，源极与第一太阳能电池板的负极连接，用于控制第一太阳能电池板供电与否。
进一步地，第一吸收回路包括：
第一电阻，第一端与第一二极管的负极连接；
第一电容，第一端分别与第一电阻的第一端和第一二极管的负极连接，第二端与第一电阻的第二端连接；
第七二极管，负极分别与第一电阻的第二端和第一电容的第二端连接；正极分别与第一MOS管的漏极和变压器电路第一输入端连接。
进一步地，第二太阳能输出控制电路包括：
第二二极管，正极与第二太阳能电池板的正极连接，负极的第一端通过第二吸收回路与变压器电路第二输入端连接，负极第二端与变压器第一输入端连接，其中，第二吸收回路用于抑制电路中漏感产生的电压应力；
第二MOS管，漏极与变压器电路第二输入端连接，源极与第二太阳能电池板的负极连接，用于控制第二太阳能电池板供电与否。
进一步地，第二吸收回路包括：
第二电阻，第一端与第二二极管的负极连接；
第二电容，第一端分别与第二电阻的第一端和第二二极管的负极连接，第二端与第二电阻的第二端连接；
第八二极管，负极分别与第二电阻的第二端和第二电容的第二端连接；正极分别与第二MOS管的漏极和变压器电路第二输入端连接。
进一步地，变压器隔离功率变换电路包括：
第三二极管、第四二极管、第五二极管、第六二极管组成的桥式整流电路，其中，第三二极管的正极与变压器第二输出端连接，负极与第四二极管的负极连接；第四二极管的正极与第六二极管的负极连接，并连接至变压器第一输出端；第五二极管的负极与第三二极管的正极连接，正极与第六二极管的正极连接，并连接至变压器隔离功率变换电路的第二输出端；
第一电感，第一端与第三二极管和第四二极管的负极连接，第二端与变压器隔离功率变 换电路的第一输出端连接；
第三电容，第一端与变压器隔离功率变换电路的第一输出端连接，第二端与变压器隔离功率变换电路的第二输出端连接。
进一步地，变压器隔离功率变换电路包括：
第九二极管，负极与变压器第二输出端连接，正极与变压器隔离功率变换电路的第二输出端；
第十二极管，正极与第九二极管的正极连接，并连接至变压器隔离功率变换电路的第二输出端，负极与变压器第一输出端连接；
第二电感，第一端分别与变压器第二输出端和第九二极管的负极连接，第二端与变压器隔离功率变换电路的第一输出端；
第三电感，第一端分别与第十二极管负极和变压器第一输出端连接，第二端与第二电感的第二端连接；
第四电容，第一端与变压器隔离功率变换电路的第一输出端连接，第二端与变压器隔离功率变换电路的第二输出端连接。
根据本公开实施例的另一方面，提供了一种空调供电系统，包括上述的太阳能直流变换器、第一太阳能电池板、第二太阳能电池板以及空调机组，其中，第一太阳能电池板、第二太阳能电池板通过太阳能直流变换器为空调机组供电。
根据本公开实施例的另一方面，提供了一种通过上述太阳能直流变换器进行供电的供电控制方法，通过第一太阳能输出控制电路、第二太阳能输出控制电路分别控制第一太阳能电池板、第二太阳能电池板的输出通断，以实现第一太阳能电池板、第二太阳能电池板分时对负载进行供电。
进一步地，对第一太阳能电池板、第二太阳能电池板供电过程中进行独立的最大功率追踪控制。
在本申请中，对于具有不同电压太阳能电池组供电控制时，设置第一太阳能输出控制电路和第二太阳能输出控制电路，实现不同电压太阳能电池组的分时控制，同时，通过设置输入端分别与第一太阳能输出控制电路的输出端和第二太阳能输出控制电路的输出端连接的变压器隔离功率变换电路，完成一个变压器实现两个不同电压太阳能电池组的输入，这种结构的太阳能直流变换器有效地解决现有技术中多个太阳能电池板供电时，需要采用多个功率变换器分别对应多输入的太阳能电池电源，成本较高的问题，降低太阳能电源输入的设备成本。
附图说明
图1是根据本申请实施例的太阳能直流变换器的一种可选的结构框图；
图2是根据本申请实施例的太阳能直流变换器的一种可选的电路结构图；
图3是根据本申请实施例的太阳能直流变换器的另一种可选的电路结构图；以及
图4是根据本申请实施例的空调供电系统的一种可选的结构框图。
具体实施方式
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本申请相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本申请的一些方面相一致的装置和方法的例子。
实施例1
下面结合附图对本申请提供的太阳能直流变换器进行说明。
图1示出太阳能直流变换器的一种可选的结构框图，如图1所示，该太阳能直流变换器包括如下部分：
第一太阳能输出控制电路101，输入端与第一太阳能电池板10的输出端连接，用于控制第一太阳能电池板10的输出；
第二太阳能输出控制电路102，输入端与第二太阳能电池板11的输出端连接，用于控制第二太阳能电池板11的输出；
变压器隔离功率变换电路103，输入端分别与第一太阳能输出控制电路的输出端和第二太阳能输出控制电路的输出端连接，输出端用于与负载连接，用以为负载20供电。
在上述实施方式中，对于具有不同电压太阳能电池组(第一太阳能电池板10、第二太阳能电池板11)供电控制时，设置第一太阳能输出控制电路101和第二太阳能输出控制电路102，对不同电压太阳能电池组的分时控制，并且，通过设置输入端分别与第一太阳能输出控制电路101的输出端和第二太阳能输出控制电路102的输出端连接的变压器隔离功率变换电路103，完成一个变压器即可实现两个不同电压太阳能电池组的输入，这种结构的太阳能直流变换器有效地解决现有技术中多个太阳能电池板供电时，需要采用多个功率变换器分别对应多输入的太阳能电池电源，成本较高的问题，降低太阳能电源输入的设备成本。
下面结合图2和图3对上述太阳能直流变换器的电路结构进行具体说明：
图2示出上述太阳能直流变换器的一种可选的电路连接图，如图2所示为包括S11和S21共两个太阳能电池板的供电方案，具体设置电路时，上述的第一太阳能输出控制电路101如图2所示，包括：
第一二极管D12，正极与第一太阳能电池板S11的正极连接，负极的第一端通过第一吸收回路与变压器电路第一输入端连接，负极第二端与变压器第二输入端连接，其中，优选地，上述第一吸收回路包括：第一电阻R11，第一端与第一二极管D12的负极连接；第一电容C11，第一端分别与第一电阻R11的第一端和第一二极管D12的负极连接，第二端与第一电阻R11的第二端连接,第七二极管D11，负极分别与第一电阻R11的第二端和第一电容C11的第二端连接；正极分别与第一MOS管MOS11的漏极和变压器电路第一输入端连接。该第一吸收 回路用于抑制电路中漏感产生的电压应力；
第一MOS管MOS11，漏极与变压器电路第一输入端连接，源极与第一太阳能电池板S11的负极连接，用于控制第一太阳能电池板S11供电与否。
上述的第二太阳能输出控制电路102如图2所示，包括：
第二二极管D22，正极与第二太阳能电池板S21的正极连接，负极的第一端通过第二吸收回路与变压器电路第二输入端连接，负极第二端与变压器第一输入端连接，其中，优选地，第二吸收回路包括：第二电阻R21，第一端与第二二极管D22的负极连接；第二电容C21，第一端分别与第二电阻R21的第一端和第二二极管D22的负极连接，第二端与第二电阻R21的第二端连接；第八二极管D21，负极分别与第二电阻R21的第二端和第二电容C21的第二端连接；正极分别与第二MOS管MOS21的漏极和变压器电路第二输入端连接。第二吸收回路用于抑制电路中漏感产生的电压应力；
第二MOS管MOS21，漏极与变压器电路第二输入端连接，源极与第二太阳能电池板S21的负极连接，用于控制第二太阳能电池板供电与否。
上述的变压器隔离功率变换电路如图2所示，包括：
第三二极管D31、第四二极管D32、第五二极管D33、第六二极管D34组成的桥式整流电路，其中，第三二极管D31的正极与变压器第二输出端连接，负极与第四二极管D32的负极连接；第四二极管D32的正极与第六二极管D34的负极连接，并连接至变压器第一输出端；第五二极管D33的负极与第三二极管D31的正极连接，正极与第六二极管D34的正极连接，并连接至变压器隔离功率变换电路的第二输出端；
第一电感L31，第一端与第三二极管D31和第四二极管D32的负极连接，第二端与变压器隔离功率变换电路的第一输出端连接；
第三电容C31，第一端与变压器隔离功率变换电路的第一输出端连接，第二端与变压器隔离功率变换电路的第二输出端连接。
图2示出的直流变换器为双输入隔离型直流变换器，两个输入功率管采用分时导通的方式。为了抑制漏感产生的电压应力，两个变压器输入原边都设置了吸收电路。在系统母线电压较高时，变压器副边输出绕组采用桥式拓扑。
图2中功率管MOS11导通时，太阳能电池S11的能量经过原边绕组NP1、磁芯、副边绕组NS及整流二极管D31、D34、电感L31传输到负载RL。另一电源输入绕组NP2虽然有感应电压，但由于只有吸收回路一路回路，基本不产生输出功率。
功率管MOS11关断时，磁芯中的励磁能量、漏感中的能量以及副边电感的续流等因素，续流二级管的导通过程等存在一个动态过程。随着这个过程的结束，变换器进入副边电感续流阶段。此后另一路绕组电路的功率管MOS21导通，其过程与前述相同。
根据副边电感电流的连续性，此变换器工作模式可分为电感电流不连续模式DCM,电感电流连续模式CCM以及临界导通模式CRM。为了避免两路输入电源在变压器磁场中的相互 耦合及磁复位问题给变换器控制带来的困难，方案中采用每个输入电源分时工作，副边电感电流不连续DCM的工作方式，即，在功率管导通之前副边电感续流电流已经下降到零(其中，优选地，在导通之前可通过电流检测元件检测副边电感电流值是否为零)。
在电感电流不连续DCM或临界导通的前提下，根据检测到的太阳能电池板电源电压及相应的电流可得到太阳能电池板的输出功率，在进行控制时，可以通过动态控制功率管的占空比使太阳能电池板的输出功率始终维持在最大值，具体来说，优选地，以一个时间段为单位，在此时间段内功率管占空比相同，检测太阳能电池板的平均电流与电压，得到功率。当此功率小于上一时间段的功率时，功率管的占空比调到上一时间段的占空比。当此功率大于上一时间段功率时，功率管的占空比按前一段的变化趋势再增加或减少一定开通时间段。由此往复实现太阳能电池板的输出功率始终在最高点，实现最大功率跟踪MPPT。
图3示出上述太阳能直流变换器的另一种可选的电路连接图，如图3所示为包括S11和S21共两个太阳能电池板的供电方案，此处需要说明的是，为了方便比较图2和图3，部分元器件标号相同，在实际设置时，图2和图3中标号相同的元器件取值可以相同也可以不同。具体设置电路时，上述的第一太阳能输出控制电路101如图3所示，包括：
第一二极管D12，正极与第一太阳能电池板S11的正极连接，负极的第一端通过第一吸收回路与变压器电路第一输入端连接，负极第二端与变压器第二输入端连接，其中，优选地，上述第一吸收回路包括：第一电阻R11，第一端与第一二极管D12的负极连接；第一电容C11，第一端分别与第一电阻R11的第一端和第一二极管D12的负极连接，第二端与第一电阻R11的第二端连接,第七二极管D11，负极分别与第一电阻R11的第二端和第一电容C11的第二端连接；正极分别与第一MOS管MOS11的漏极和变压器电路第一输入端连接。该第一吸收回路用于抑制电路中漏感产生的电压应力；
第一MOS管MOS11，漏极与变压器电路第一输入端连接，源极与第一太阳能电池板S11的负极连接，用于控制第一太阳能电池板S11供电与否。
上述的第二太阳能输出控制电路102如图3所示，包括：
第二二极管D22，正极与第二太阳能电池板S21的正极连接，负极的第一端通过第二吸收回路与变压器电路第二输入端连接，负极第二端与变压器第一输入端连接，其中，优选地，第二吸收回路包括：第二电阻R21，第一端与第二二极管D22的负极连接；第二电容C21，第一端分别与第二电阻R21的第一端和第二二极管D22的负极连接，第二端与第二电阻R21的第二端连接；第八二极管D21，负极分别与第二电阻R21的第二端和第二电容C21的第二端连接；正极分别与第二MOS管MOS21的漏极和变压器电路第二输入端连接。第二吸收回路用于抑制电路中漏感产生的电压应力；
第二MOS管MOS21，漏极与变压器电路第二输入端连接，源极与第二太阳能电池板S21的负极连接，用于控制第二太阳能电池板供电与否。
上述的变压器隔离功率变换电路如图3所示，包括：
第九二极管D31，负极与变压器第二输出端连接，正极与变压器隔离功率变换电路的第二输出端；
第十二极管D32，正极与第九二极管D31的正极连接，并连接至变压器隔离功率变换电路的第二输出端，负极与变压器第一输出端连接；
第二电感L31，第一端分别与变压器第二输出端和第九二极管D31的负极连接，第二端与变压器隔离功率变换电路的第一输出端；
第三电感L32，第一端分别与第十二极管D32负极和变压器第一输出端连接，第二端与第二电感L31的第二端连接；
第四电容C31，第一端与变压器隔离功率变换电路的第一输出端连接，第二端与变压器隔离功率变换电路的第二输出端连接。
图3所示电路结构中，变压器原边元器件和图2相同，副边结构不相同，图2的双输入隔离型直流变换器主要针对输出电压较高的情况下使用，图3的双输入隔离型直流变换器主要针对输出电流较大的情况下使用。
在副边输出电流较大时可以采用如图3所示的方案拓扑。图3中，高频变压器原边电路拓扑和图2相同，副边拓扑采用两个副边电感的方式，此方式可以实现原边相应导通功率管的电流减半。控制上还是采用电感电流不连续导通方式(其中，功率管MOS11的导通对应于副边电感L31的不连续导通，功率管MOS21的导通对应于副边电感L32的不连续导通)。其余的最大功率跟踪控制和图2相同，此处不再赘述。
在上述实施例中，对于具有不同电压太阳能电池组供电控制时，设置第一太阳能输出控制电路和第二太阳能输出控制电路，实现不同电压太阳能电池组的分时控制，同时，通过设置输入端分别与第一太阳能输出控制电路的输出端和第二太阳能输出控制电路的输出端连接的变压器隔离功率变换电路，完成一个变压器实现两个不同电压太阳能电池组的输入，这种结构的太阳能直流变换器有效地解决现有技术中多个太阳能电池板供电时，需要采用多个功率变换器分别对应多输入的太阳能电池电源，成本较高的问题，降低太阳能电源输入的设备成本。
实施例2
基于上述实施例1中提供的太阳能直流变换器，本申请可选的实施例2还提供了一种空调供电系统，具体来说，图4示出该空调供电系统的一种可选的结构框图，如图4所示，该空调供电系统包括：太阳能直流变换器40、第一太阳能电池板10、第二太阳能电池板11以及空调机组42，第一太阳能电池板10、第二太阳能电池板11通过太阳能直流变换器40为空调机组42供电。其中，太阳能直流变换器结构如上述实施例1中所描述，此处不再赘述。
由于太阳能电池板摆放位置不同导致的输出电压不同，因此不能并联给空调系统供电，必须分开供电，普通的太阳能变换器采用两个功率变换器处理两组太阳能电池板，本实施例中采用一个功率变换器实现了两组电池板的供电。且两组电池板之间实现了隔离减少了相互 干扰，对电磁兼容有利。且一个变压器实现了两组隔离的太阳能电池板输入节省了成本。
实施例3
基于上述实施例1中提供的太阳能直流变换器，本申请可选的实施例3还提供了一种通过太阳能直流变换器进行供电的供电控制方法，其中，太阳能直流变换器结构如上述实施例1中所描述，此处不再赘述。在通过太阳能直流变换器进行供电的控制中，通过第一太阳能输出控制电路、第二太阳能输出控制电路分别控制第一太阳能电池板、第二太阳能电池板的输出通断，以实现第一太阳能电池板、第二太阳能电池板分时对负载进行供电。
此外，对第一太阳能电池板、第二太阳能电池板供电过程中进行独立的最大功率追踪控制。具体地，在电感电流不连续DCM或临界导通的前提下，根据检测到的太阳能电池板电源电压及相应的电流可得到太阳能电池板的输出功率，在进行控制时，可以通过动态控制功率管的占空比使太阳能电池板的输出功率始终维持在最大值，具体来说，优选地，以一个时间段为单位，在此时间段内功率管占空比相同，检测太阳能电池板的平均电流与电压，得到功率。当此功率小于上一时间段的功率时，功率管的占空比调到上一时间段的占空比。当此功率大于上一时间段功率时，功率管的占空比按前一段的变化趋势再增加或减少一定开通时间段。由此往复实现太阳能电池板的输出功率始终在最高点，实现最大功率跟踪MPPT。
从以上描述中可以看出，在本申请提供的实施例中，对于具有不同电压太阳能电池组供电控制时，设置第一太阳能输出控制电路和第二太阳能输出控制电路，实现不同电压太阳能电池组的分时控制，同时，通过设置输入端分别与第一太阳能输出控制电路的输出端和第二太阳能输出控制电路的输出端连接的变压器隔离功率变换电路，完成一个变压器实现两个不同电压太阳能电池组的输入，这种结构的太阳能直流变换器有效地解决现有技术中多个太阳能电池板供电时，需要采用多个功率变换器分别对应多输入的太阳能电池电源，成本较高的问题，降低太阳能电源输入的设备成本。
本领域技术人员在考虑说明书及实践这里公开的发明后，将容易想到本申请的其它实施方案。本申请旨在涵盖本申请的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本申请的一般性原理并包括本申请未发明的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本申请的真正范围和精神由下面的权利要求指出。
应当理解的是，本申请并不局限于上面已经描述并在附图中示出的精确结构，并且可以在不脱离其范围进行各种修改和改变。本申请的范围仅由所附的权利要求来限制。

Claims (10)

  1. 一种太阳能直流变换器，其特征在于，包括：
    第一太阳能输出控制电路，输入端与第一太阳能电池板的输出端连接，用于控制所述第一太阳能电池板的输出；
    第二太阳能输出控制电路，输入端与第二太阳能电池板的输出端连接，用于控制所述第二太阳能电池板的输出；
    变压器隔离功率变换电路，输入端分别与所述第一太阳能输出控制电路的输出端和所述第二太阳能输出控制电路的输出端连接，输出端用于与负载连接，用以为负载供电。
  2. 根据权利要求1所述的太阳能直流变换器，其特征在于，所述第一太阳能输出控制电路包括：
    第一二极管，正极与所述第一太阳能电池板的正极连接，负极的第一端通过第一吸收回路与所述变压器电路第一输入端连接，负极第二端与所述变压器第二输入端连接，其中，所述第一吸收回路用于抑制电路中漏感产生的电压应力；
    第一MOS管，漏极与所述变压器电路第一输入端连接，源极与所述第一太阳能电池板的负极连接，用于控制所述第一太阳能电池板供电与否。
  3. 根据权利要求2所述的太阳能直流变换器，其特征在于，所述第一吸收回路包括：
    第一电阻，第一端与所述第一二极管的负极连接；
    第一电容，第一端分别与所述第一电阻的第一端和所述第一二极管的负极连接，第二端与所述第一电阻的第二端连接；
    第七二极管，负极分别与所述第一电阻的第二端和所述第一电容的第二端连接；正极分别与所述第一MOS管的漏极和所述变压器电路第一输入端连接。
  4. 根据权利要求3所述的太阳能直流变换器，其特征在于，所述第二太阳能输出控制电路包括：
    第二二极管，正极与所述第二太阳能电池板的正极连接，负极的第一端通过第二吸收回路与所述变压器电路第二输入端连接，负极第二端与所述变压器第一输入端连接，其中，所述第二吸收回路用于抑制电路中漏感产生的电压应力；
    第二MOS管，漏极与所述变压器电路第二输入端连接，源极与所述第二太阳能电池板的负极连接，用于控制所述第二太阳能电池板供电与否。
  5. 根据权利要求4所述的太阳能直流变换器，其特征在于，所述第二吸收回路包括：
    第二电阻，第一端与所述第二二极管的负极连接；
    第二电容，第一端分别与所述第二电阻的第一端和所述第二二极管的负极连接，第二端与所述第二电阻的第二端连接；
    第八二极管，负极分别与所述第二电阻的第二端和所述第二电容的第二端连接；正极分 别与所述第二MOS管的漏极和所述变压器电路第二输入端连接。
  6. 根据权利要求1至5任一项所述的太阳能直流变换器，其特征在于，所述变压器隔离功率变换电路包括：
    第三二极管、第四二极管、第五二极管、第六二极管组成的桥式整流电路，其中，所述第三二极管的正极与所述变压器第二输出端连接，负极与所述第四二极管的负极连接；所述第四二极管的正极与所述第六二极管的负极连接，并连接至所述变压器第一输出端；所述第五二极管的负极与所述第三二极管的正极连接，正极与所述第六二极管的正极连接，并连接至所述变压器隔离功率变换电路的第二输出端；
    第一电感，第一端与所述第三二极管和所述第四二极管的负极连接，第二端与所述变压器隔离功率变换电路的第一输出端连接；
    第三电容，第一端与所述变压器隔离功率变换电路的第一输出端连接，第二端与所述变压器隔离功率变换电路的第二输出端连接。
  7. 根据权利要求1至5任一项所述的太阳能直流变换器，其特征在于，所述变压器隔离功率变换电路包括：
    第九二极管，负极与所述变压器第二输出端连接，正极与所述变压器隔离功率变换电路的第二输出端；
    第十二极管，正极与所述第九二极管的正极连接，并连接至所述变压器隔离功率变换电路的第二输出端，负极与所述变压器第一输出端连接；
    第二电感，第一端分别与所述变压器第二输出端和所述第九二极管的负极连接，第二端与所述变压器隔离功率变换电路的第一输出端；
    第三电感，第一端分别与所述第十二极管负极和所述变压器第一输出端连接，第二端与所述第二电感的第二端连接；
    第四电容，第一端与所述变压器隔离功率变换电路的第一输出端连接，第二端与所述变压器隔离功率变换电路的第二输出端连接。
  8. 一种空调供电系统，其特征在于，包括如权利要求1-7任一项所述的太阳能直流变换器、第一太阳能电池板、第二太阳能电池板以及空调机组，其中，所述第一太阳能电池板、第二太阳能电池板通过所述太阳能直流变换器为所述空调机组供电。
  9. 一种通过权利要求1-7任一项所述太阳能直流变换器进行供电的供电控制方法，其特征在于，
    通过所述第一太阳能输出控制电路、所述第二太阳能输出控制电路分别控制所述第一太阳能电池板、所述第二太阳能电池板的输出通断，以实现所述第一太阳能电池板、所述第二太阳能电池板分时对负载进行供电。
  10. 根据权利要求9所述的方法，其特征在于，还包括：对所述第一太阳能电池板、所述第二太阳能电池板供电过程中进行独立的最大功率追踪控制。
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