CN104935043B - Photovoltaic power supply device, PV air-conditioner system and automobile - Google Patents
Photovoltaic power supply device, PV air-conditioner system and automobile Download PDFInfo
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- CN104935043B CN104935043B CN201510336994.9A CN201510336994A CN104935043B CN 104935043 B CN104935043 B CN 104935043B CN 201510336994 A CN201510336994 A CN 201510336994A CN 104935043 B CN104935043 B CN 104935043B
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- 238000004378 air conditioning Methods 0.000 claims description 16
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- 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
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- 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
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Abstract
The present invention discloses a kind of photovoltaic power supply device, PV air-conditioner system and automobile, wherein, photovoltaic power supply device includes photovoltaic generating module, DC transfer circuit, direct current output bus, battery module, duty ratio adjusting circuit and pulse signal generator, the output end of the input connection photovoltaic generating module of DC transfer circuit, the output end of DC transfer circuit export through dc bus；The charge-discharge end connection dc bus of battery module；The output end of the input connection photovoltaic generating module of duty ratio adjusting circuit, the voltage and current of the output end of photovoltaic generating module is sampled, with dutycycle corresponding to Maximum Power Output point；Pulse signal generator receives the dutycycle of duty ratio adjusting circuit output, generates corresponding pulse control signal according to dutycycle, controls the work of DC transfer circuit.Technical solution of the present invention improves the charging rate of battery module and the utilization rate of photovoltaic generating module generated energy, reduces energy waste.
Description
Technical Field
The invention relates to the technical field of photovoltaics, in particular to a photovoltaic power supply device, a photovoltaic air conditioning system and an automobile.
Background
The sunburn of the sun in summer can turn the cab of the car very hot, especially after a stop, making it difficult to rest in the cab without an air conditioner. At present, most automobiles are provided with air conditioners, the air conditioners are driven to work by oil burning of automobile engines, the engines cannot stop during automobile stop, unnecessary waste is caused, and especially for trucks and trailers with large horsepower, the oil consumption of the vehicle air conditioners which are started independently is larger.
In order to solve the problems, the vehicle-mounted photovoltaic air conditioning system is produced by the way, and the photovoltaic cell panel (namely the photovoltaic power generation module) generates power to supply power to the vehicle-mounted air conditioner, so that the problems are solved. In daytime, the photovoltaic air-conditioning system charges a storage battery module (which can comprise a storage battery of an automobile) of the photovoltaic air-conditioning system through power generation of a photovoltaic cell panel so as to be used at night; however, the charging scheme of the existing photovoltaic air conditioning system is only to add a diode for preventing reverse charging at the output end of the photovoltaic cell panel, and the output of the photovoltaic cell panel does not work at the maximum power output point for most of time, so that the utilization rate of the generated energy of the photovoltaic cell panel is low, the charging of the storage battery module is slow, and the energy is wasted.
Disclosure of Invention
The invention mainly aims to provide a photovoltaic power supply device, aiming at enabling a photovoltaic power generation module to work at the maximum power point, thereby improving the utilization rate of the generated energy of the photovoltaic power generation module and the charging speed of a storage battery module and fully utilizing energy.
In order to achieve the above object, the photovoltaic power supply device provided by the present invention comprises a photovoltaic power generation module, a dc conversion circuit, a dc output bus, a storage battery module, a duty ratio adjusting circuit, and a pulse signal generator, wherein:
the input end of the direct current conversion circuit is connected with the output end of the photovoltaic power generation module, and the output end of the direct current conversion circuit is output through a direct current bus;
the charging and discharging end of the storage battery module is connected with the direct current bus;
the input end of the duty ratio adjusting circuit is connected with the output end of the photovoltaic power generation module, the voltage and the current of the output end of the photovoltaic power generation module are sampled, and the duty ratio corresponding to the maximum power point is output according to the sampled voltage and current; the duty ratio input end of the pulse signal generator is connected with the output end of the duty ratio adjusting circuit, the output end of the pulse signal generator is connected with the controlled end of the direct current conversion circuit, and the pulse signal generator receives the duty ratio output by the duty ratio adjusting circuit, generates a corresponding pulse control signal according to the duty ratio and controls the work of the direct current conversion circuit.
Preferably, the duty cycle adjusting circuit includes a first sampling circuit, a maximum power point tracking controller, a first comparison chip and a duty cycle conversion circuit, wherein an input end of the first sampling circuit is connected to an output end of the photovoltaic power generation module, and the input end of the first sampling circuit samples voltage and current at the output end of the photovoltaic power generation module; a voltage output end of the first sampling circuit outputs sampled voltage to the maximum power point tracking controller, and a current output end of the first sampling circuit outputs sampled current to the maximum power point tracking controller; wherein,
the maximum power point tracking controller tracks the received voltage and current to output a reference voltage corresponding to the maximum power point; a first input end of the first comparison chip is connected with an output end of the maximum power point tracking controller, a second input end of the first comparison chip is connected with a voltage output end of the first sampling circuit, and an output end of the first comparison chip is connected with an input end of the duty ratio conversion circuit; the first comparison chip compares the voltages received by the first input end and the second input end of the first comparison chip to output voltage deviation to the duty ratio conversion circuit, and the duty ratio conversion circuit outputs corresponding duty ratio according to the received voltage deviation.
Preferably, the duty cycle adjusting circuit includes a first sampling circuit, a maximum power point tracking controller, a first comparison chip and a duty cycle conversion circuit, wherein an input end of the first sampling circuit is connected to an output end of the photovoltaic power generation module, and the input end of the first sampling circuit samples voltage and current at the output end of the photovoltaic power generation module; a voltage output end of the first sampling circuit outputs sampled voltage to the maximum power point tracking controller, and a current output end of the first sampling circuit outputs sampled current to the maximum power point tracking controller; wherein,
the maximum power point tracking controller tracks the received voltage and current to output a reference current corresponding to the maximum power point; a first input end of the first comparison chip is connected with an output end of the maximum power point tracking controller, and a second input end of the first comparison chip is connected with a current output end of the first sampling circuit; the first comparison chip compares the currents received by the first input end and the second input end of the first comparison chip to output current deviation to the duty ratio conversion circuit, and the duty ratio conversion circuit outputs corresponding duty ratio according to the received voltage deviation.
Preferably, the duty cycle conversion circuit comprises a first proportional integral controller, an input end of the first proportional integral controller is an input end of the duty cycle conversion circuit, and an output end of the first proportional integral controller is an output end of the duty cycle conversion circuit; the first proportional integral controller outputs a corresponding duty ratio according to the electric signal received by the input end of the first proportional integral controller.
Preferably, the duty cycle conversion circuit includes a second proportional-integral controller, a second comparison chip, a second sampling circuit, and a third proportional-integral controller, an input end of the second proportional-integral controller is an input end of the duty cycle conversion circuit, an output end of the second proportional-integral controller is connected to a first input end of the second comparison chip, the second sampling circuit samples a current at an output end of the dc conversion circuit and outputs the current to a second input end of the second comparison chip, an output end of the second comparison chip is connected to an input end of the third proportional-integral controller, and an output end of the third proportional-integral controller is an output end of the duty cycle conversion circuit;
the second proportional-integral controller outputs corresponding output reference current of the direct current conversion circuit according to the electric signal received by the input end of the second proportional-integral controller, the second comparison chip compares the output reference current with the current output by the second sampling circuit to obtain current deviation, and the third proportional-integral controller outputs corresponding duty ratio according to the received current deviation.
Preferably, the duty ratio adjusting circuit further comprises a signal switching module, a third sampling circuit, a state of charge monitoring module and a charging curve planning module, wherein the third sampling circuit samples the voltage and current of a charging and discharging end of the storage battery module and outputs the voltage and current to the state of charge monitoring module, the state of charge monitoring module obtains the state of charge of the storage battery module according to the received voltage and current and outputs a corresponding control signal to the signal switching module according to whether the state of charge of the storage battery reaches a preset threshold value;
the charging curve planning module outputs a corresponding reference current to a first input end of the signal switching module according to the received charge state, a second input end of the signal switching module is connected with an output end of the second proportional-integral controller, and an output end of the signal switching module is connected with a first input end of the second comparison chip; when the state of charge of the storage battery reaches the preset threshold value, the state of charge monitoring module outputs a first control signal to control the first input end and the output end of the signal switching module to be communicated; and the charge state monitoring module outputs a second control signal to control the second input end of the signal switching module to be communicated with the output end when the charge state of the storage battery does not reach the preset threshold value.
Preferably, the dc conversion circuit is one of a half-bridge inverter full-bridge rectification topology circuit, a half-bridge inverter half-bridge rectification topology circuit, a full-bridge LLC resonant inverter full-bridge rectification topology circuit, an interleaved flyback dc conversion topology circuit, a push-pull dc conversion topology circuit, and a dual-transistor forward dc conversion topology circuit.
The invention further provides a photovoltaic air conditioning system which comprises the full direct current air conditioner and the photovoltaic power supply device, wherein the full direct current air conditioner is connected with the direct current bus.
Preferably, the all-direct-current air conditioner is a low-voltage all-direct-current air conditioner.
The invention further provides an automobile which comprises the photovoltaic air conditioning system, the full direct current air conditioner is arranged in the automobile installation space, and the photovoltaic power generation module is arranged on the outer side of the shell of the automobile.
According to the technical scheme, the duty ratio adjusting circuit is adopted to sample and monitor the output voltage and the output current of the photovoltaic power generation module in real time, so that the duty ratio corresponding to the current maximum power point of the photovoltaic power generation module is obtained, the pulse signal generator is enabled to generate corresponding pulse signal output, and the direct current conversion circuit is controlled to charge the storage battery module through the maximum power working output, so that the charging speed of the storage battery module and the utilization rate of the generated energy of the photovoltaic power generation module are improved, and the energy waste is reduced.
Drawings
Fig. 1 is a schematic circuit block diagram of a first embodiment of a photovoltaic power supply apparatus according to the present invention;
FIG. 2 is a schematic diagram of a circuit block of a first embodiment of a second example of a photovoltaic power unit according to the present invention;
FIG. 3 is a schematic diagram of a circuit block of a second embodiment of a photovoltaic power unit according to the present invention;
FIG. 4 is a schematic circuit block diagram of a photovoltaic power supply apparatus according to a third embodiment of the present invention;
FIG. 5 is a schematic circuit block diagram of a photovoltaic power supply apparatus according to a fourth embodiment of the present invention;
fig. 6 is a schematic circuit block diagram of a fifth embodiment of the photovoltaic power supply apparatus according to the present invention;
fig. 7 is a circuit diagram of a first embodiment of a dc conversion circuit of the photovoltaic power supply apparatus according to the present invention;
fig. 8 is a circuit diagram of a second embodiment of the dc conversion circuit of the photovoltaic power supply apparatus according to the present invention;
fig. 9 is a circuit diagram of a third embodiment of the dc conversion circuit of the photovoltaic power supply apparatus according to the present invention;
fig. 10 is a circuit diagram of a fourth embodiment of the dc conversion circuit of the photovoltaic power supply apparatus according to the present invention;
fig. 11 is a circuit diagram of a fifth embodiment of the dc conversion circuit of the photovoltaic power supply apparatus according to the present invention;
fig. 12 is a circuit diagram of a sixth embodiment of the dc conversion circuit of the photovoltaic power supply apparatus according to the present invention;
fig. 13 is a circuit diagram of a seventh embodiment of the dc conversion circuit of the photovoltaic power supply apparatus according to the present invention;
fig. 14 is a schematic block diagram of a photovoltaic air conditioning system according to the present invention.
The reference numbers illustrate:
| photovoltaic power generation module 100 | DC conversion circuit 200 |
| DC bus 300 | Battery module 400 |
| Duty cycle regulating circuit 500 | Pulse signal generator 600 |
| First sampling circuit 510 | Maximum power point tracking controller 520 |
| First comparing chip 530 | Duty cycle conversion circuit 540 |
| First proportional integral controller 541 | Second proportional integral controller 542 |
| Second comparison chip 543 | Second sampling circuit 544 |
| Third proportional integral controller 545 | Signal switching module 546 |
| Third sampling circuit 547 | State of charge monitoring module 548 |
| Charging curve planning module 549 | Output Vo of photovoltaic power generation module 100 |
| Input Vin of dc conversion circuit 200 | Output terminal Vout of DC conversion circuit 200 |
| Charge and discharge terminals Vin-out of the battery module 400 | The voltage output terminal V1 of the first sampling circuit 510 |
| The current output terminal I1 of the first sampling circuit 510 | Full-direct-current air conditioner 700 |
| First capacitor C1 | Second capacitance C2 |
| Third capacitor C3 | Fourth capacitance C4 |
| Fifth capacitor C5 | Sixth capacitor C6 |
| Seventh capacitance C7 | Eighth capacitor C8 |
| Ninth capacitor C9 | Tenth capacitance C10 |
| Eleventh capacitor C11 | Twelfth capacitor C12 |
| Thirteenth capacitor C13 | A fourteenth capacitance C14 |
| Fifteenth capacitance C15 | Sixteenth capacitor C16 |
| Seventeenth capacitor C17 | Eighteenth capacitor C18 |
| Nineteenth capacitor C19 | Twentieth capacitor C20 |
| Twenty-first capacitor C21 | A twenty-second capacitor C22 |
| A twenty-third capacitor C23 | A twenty-fourth capacitor C24 |
| First inductance L1 | Second inductance L2 |
| Third inductance L3 | Fourth inductance L4 |
| Fifth inductance L5 | Sixth inductance L6 |
| Seventh inductance L7 | First diode D1 |
| Second diode D2 | Third diode D3 |
| Fourth diode D4 | Fifth diode D5 |
| Sixth diode D6 | Seventh diode D7 |
| Eighth diode D8 | Ninth diode D9 |
| The twelfth pole tube D10 | Eleventh diode D11 |
| Twelfth diode D12 | Thirteenth diode D13 |
| A fourteenth diode D14 | Fifteenth diode D15 |
| First PNP type triode Q1 | Second PNP type triode Q2 |
| Third PNP type triode Q3 | Fourth PNP type triode Q4 |
| Fifth PNP type triode Q5 | Sixth PNP transistor Q6 |
| Seventh PNP type triode Q7 | Eighth PNP transistor Q8 |
| Ninth PNP type triode Q9 | Tenth PNP type triode Q10 |
| Eleventh PNP type triode Q11 | The twelfth PNP type triode Q12 |
| Thirteenth PNP type triode Q13 | Fourteenth PNP type triode Q14 |
| First transformer T1 | Second transformer T2 |
| Third transformer T3 | Fourth transformer T4 |
| Fifth transformer T5 | Sixth transformer T6 |
| Seventh transformer T7 | First resistor R1 |
| First full-bridge rectifier bridge BR1 | Second full bridge rectifier bridge BR2 |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solution of the present invention is further described with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a photovoltaic power supply device.
Referring to fig. 1 to 14, fig. 1 is a schematic circuit module diagram of a first embodiment of a photovoltaic power supply apparatus according to the present invention; FIG. 2 is a schematic diagram of a circuit block of a first embodiment of a second example of a photovoltaic power unit according to the present invention; FIG. 3 is a schematic diagram of a circuit block of a second embodiment of a photovoltaic power unit according to the present invention; FIG. 4 is a schematic circuit block diagram of a photovoltaic power supply apparatus according to a third embodiment of the present invention; FIG. 5 is a schematic circuit block diagram of a photovoltaic power supply apparatus according to a fourth embodiment of the present invention; fig. 6 is a schematic circuit block diagram of a fifth embodiment of the photovoltaic power supply apparatus according to the present invention; fig. 7 is a circuit diagram of a first embodiment of a dc conversion circuit of the photovoltaic power supply apparatus according to the present invention; fig. 8 is a circuit diagram of a second embodiment of the dc conversion circuit of the photovoltaic power supply apparatus according to the present invention; fig. 9 is a circuit diagram of a third embodiment of the dc conversion circuit of the photovoltaic power supply apparatus according to the present invention; fig. 10 is a circuit diagram of a fourth embodiment of the dc conversion circuit of the photovoltaic power supply apparatus according to the present invention; fig. 11 is a circuit diagram of a fifth embodiment of the dc conversion circuit of the photovoltaic power supply apparatus according to the present invention; fig. 12 is a circuit diagram of a sixth embodiment of the dc conversion circuit of the photovoltaic power supply apparatus according to the present invention; fig. 13 is a circuit diagram of a seventh embodiment of the dc conversion circuit of the photovoltaic power supply apparatus according to the present invention.
In the first embodiment of the photovoltaic power supply apparatus of the present invention, the photovoltaic power supply apparatus includes a photovoltaic power generation module 100, a dc conversion circuit 200, a dc output bus, a storage battery module 400, a duty ratio adjustment circuit 500, and a pulse signal generator 600, wherein:
an input end Vin of the direct current conversion circuit 200 is connected with an output end Vo of the photovoltaic power generation module 100, and the output end Vout of the direct current conversion circuit 200 is output through a direct current bus 300; when the direct current bus 300 is connected with an electrical appliance, the electrical appliance is powered.
The charge and discharge end Vin-out of the storage battery module 400 is connected with the direct current bus 300;
the input end of the duty ratio adjusting circuit 500 is connected to the output end Vo of the photovoltaic power generation module 100, the voltage and the current of the output end Vo of the photovoltaic power generation module 100 (i.e., the output voltage and the output current of the photovoltaic power generation module 100) are sampled, and the duty ratio corresponding to the maximum power point state is output according to the sampled voltage and current; the duty ratio input end of the pulse signal generator 600 is connected with the output end of the duty ratio adjusting circuit 500, the output end of the pulse signal generator 600 is connected with the controlled end of the direct current conversion circuit 200, and the pulse signal generator 600 receives the duty ratio output by the duty ratio adjusting circuit 500, generates a corresponding pulse control signal according to the duty ratio, and controls the work of the direct current conversion circuit 200.
The photovoltaic power generation module 100 may be a photovoltaic cell panel, a single crystal silicon cell panel, a polycrystalline silicon cell panel, a solar thin film cell, a dye-sensitized solar cell, or the like.
According to the technical scheme of the embodiment, the duty ratio adjusting circuit 500 is adopted to sample and monitor the output voltage and the output current of the photovoltaic power generation module 100 in real time, so that the duty ratio corresponding to the current maximum power point of the photovoltaic power generation module 100 is obtained, the pulse signal generator 600 generates corresponding pulse signal output, and the direct current conversion circuit 200 is controlled to charge the storage battery module 400 through the maximum power working output, so that the charging speed of the storage battery module 400 and the utilization rate of the generated energy of the photovoltaic power generation module 100 are improved, and the energy waste is reduced.
Further, referring to fig. 2 and 3, this example presents two embodiments; with particular reference to fig. 2, the first embodiment of this example is: the duty ratio adjusting circuit 500 includes a first sampling circuit 510, a maximum power point tracking controller 520, a first comparing chip 530 and a duty ratio converting circuit 540, wherein an input end of the first sampling circuit 510 is connected to an output end Vo of the photovoltaic power generation module 100, and samples a voltage and a current of the output end Vo of the photovoltaic power generation module 100; the voltage output terminal V1 of the first sampling circuit 510 outputs the sampled voltage to the maximum power point tracking controller 520, and the current output terminal I1 of the first sampling circuit 510 outputs the sampled current to the maximum power point tracking controller 520; the maximum power point tracking controller 520 tracks the received voltage and current to obtain a reference voltage corresponding to the maximum power point and outputs the reference voltage; a first input terminal of the first comparing chip 530 is connected to the output terminal of the maximum power point tracking controller 520, a second input terminal of the first comparing chip 530 is connected to the voltage output terminal V1 of the first sampling circuit 510, and an output terminal of the first comparing chip 530 is connected to the input terminal of the duty ratio converting circuit 540; the first comparing chip 530 compares the voltages received by the first input terminal and the second input terminal thereof to output a voltage deviation to the duty ratio converting circuit 540, and the duty ratio converting circuit 540 outputs a corresponding duty ratio according to the received voltage deviation.
Referring to fig. 3, the second embodiment of this example differs from the first embodiment in that: the maximum power point tracking controller 520 tracks the received voltage and current to output a reference current corresponding to the maximum power point; a first input terminal of the first comparing chip 530 is connected to the output terminal of the maximum power point tracking controller 520, and a second input terminal of the first comparing chip 530 is connected to the current output terminal I1 of the first sampling circuit 510; the first comparing chip 530 compares the currents received by the first input terminal and the second input terminal thereof to output a current deviation to the duty ratio converting circuit 540, and the duty ratio converting circuit 540 outputs a corresponding duty ratio according to the received voltage deviation.
Preferably, referring to fig. 4, the present embodiment is based on the scheme of the second embodiment, and in the present embodiment, the duty ratio conversion circuit 540 includes a first proportional integral controller 541, an input end of the first proportional integral controller 541 is an input end of the duty ratio conversion circuit 540, and an output end of the first proportional integral controller 541 is an output end of the duty ratio conversion circuit 540; the first proportional-integral controller 541 outputs a corresponding duty ratio according to an electric signal (in this embodiment, the electric signal is a voltage deviation signal) received at its input terminal. In this embodiment, the first proportional integral controller 541 receives the voltage deviation signal output from the first comparison chip 530, and the first proportional integral controller 541 integrates the received voltage deviation and outputs a duty ratio proportional to the integral of the voltage deviation. Of course, this example is merely an example of the first embodiment that is preferably based on the second example; this embodiment may also be based on the second implementation of the second embodiment, in which the first proportional-integral controller 541 receives the current deviation signal output by the first comparison chip 530, and the first proportional-integral controller 541 integrates the received current deviation and outputs a duty ratio proportional to the integral of the current deviation.
Preferably, referring to fig. 5, this embodiment is preferably based on the first implementation of the second embodiment, the duty cycle conversion circuit 540 of this embodiment includes a second proportional-integral controller 542, a second comparison chip 543, a second sampling circuit 544 and a third proportional-integral controller 545, an input terminal of the second proportional-integral controller 542 is an input terminal of the duty cycle conversion circuit 540, an output terminal of the second proportional-integral controller 542 is connected to a first input terminal of the second comparison chip 543, the second sampling circuit 544 samples a current of the output terminal Vout of the dc conversion circuit 200 and outputs the current to a second input terminal of the second comparison chip 543, an output terminal of the second comparison chip 543 is connected to an input terminal of the third proportional-integral controller 545, and an output terminal of the third proportional-integral controller 545 is an output terminal of the duty cycle conversion circuit 540; the second proportional-integral controller 542 outputs a corresponding output reference current of the dc converter circuit 200 according to the electrical signal (in this embodiment, a voltage deviation signal) received by the input terminal thereof, the second comparing chip 543 compares the output reference current with the current output by the second sampling circuit 544 to obtain a current deviation, and the third proportional-integral controller 545 outputs a corresponding duty ratio according to the received current deviation.
The second proportional-integral controller 542 integrates the received voltage deviation, outputs an output reference current (i.e., an output current corresponding to the maximum power point) of the dc conversion circuit 200 with a proportion corresponding to the integral of the voltage deviation, the second comparing chip 543 compares the output reference current with the current output current of the dc conversion circuit 200 sampled and fed back by the second sampling circuit 544 to obtain a current deviation, and sends the current deviation to the third proportional-integral controller 545, and the third proportional-integral controller 545 integrates the received current deviation and outputs a duty ratio with a proportion corresponding to the integral of the current deviation. The technical solution of the present embodiment adopts two times of proportional integration by the second proportional-integral controller 542 and the third proportional-integral controller 545 to confirm the duty ratio, so that the duty ratio is more accurate.
Of course, the present embodiment can also be based on the second implementation of the second embodiment, and the difference is only that the second proportional-integral controller 542 receives the current deviation signal outputted by the first comparing chip 530 and outputs the corresponding output current reference value according to the current deviation signal.
Further, referring to fig. 6, based on the technical solution of the fourth embodiment, the duty ratio adjusting circuit 500 of this embodiment further includes a signal switching module 546, a third sampling circuit 547, a state of charge monitoring module 548 and a charging curve planning module 549, where the third sampling circuit 547 samples the voltage and current of the charge/discharge end Vin-out of the battery module 400 and outputs the voltage and current to the state of charge monitoring module 548, and the state of charge monitoring module 548 obtains the state of charge of the battery module 400 according to the received voltage and current and outputs the state of charge to the charging curve planning module 549, and outputs a corresponding control signal to the signal switching module 546 according to whether the state of charge of the battery reaches a preset threshold;
the charging curve planning module 549 outputs a corresponding reference current to a first input end of the signal switching module 546 according to the received charge state, a second input end of the signal switching module 546 is connected to an output end of the second proportional-integral controller 542, and an output end of the signal switching module 546 is connected to a first input end of the second comparing chip 543; when the state of charge of the storage battery reaches a preset threshold value, the state of charge monitoring module 548 outputs a first control signal to control the first input end and the output end of the signal switching module 546 to be communicated; the state of charge monitoring module 548 outputs a second control signal to control the second input end of the signal switching module 546 to be communicated with the output end when the state of charge of the battery does not reach the preset threshold.
In this embodiment, the third sampling circuit 547 feeds back the current and voltage of the charge/discharge end Vin-out of the battery module 400 to the state of charge monitoring module 548 in real time, and the state of charge monitoring module 548 calculates the remaining electric quantity in the battery module 400 according to the charge/discharge current and voltage of the charge/discharge end Vin-out of the battery module 400, and according to the charge current and the discharge current of the charge/discharge end Vin-out being positive and the discharge current being negative, so as to obtain the state of charge of the battery module 400; the state of charge monitoring module 548 outputs the obtained state of charge to the charging curve planning module 549, and the charging curve planning module 549 outputs the charging current corresponding to the current state of charge to the second input end of the signal switching module 546 according to the curve relationship between the state of charge and the charging current; a threshold is preset in the state of charge monitoring module 548 (the threshold is preferably the critical state of charge for entering trickle charge in this embodiment). 1. When the obtained charge state reaches the threshold value (i.e. the trickle charge state of charge is reached), a first control signal is output to control the output end of the signal switching module 546 to be communicated with the second input end of the signal switching module 546 (i.e. to be communicated with the output end of the charge curve planning module 549), so that the signal switching module 546 outputs a charging current (i.e. a trickle charging current) corresponding to the current charge state, the second comparing chip 543 compares the current charging current with the trickle charging current to obtain a current deviation, the third proportional-integral controller 545 obtains a corresponding duty ratio according to the current deviation, the duty ratio enables the pulse signal generator 600 to generate a corresponding pulse signal, thereby feedback-adjusting the output current of the dc conversion circuit 200 to be the trickle charging current, trickle-charging the storage battery module 400, and preventing the charging current of the storage battery module 400 from being too large, the safety of the battery module 400 is ensured. 2. When the derived state of charge does not reach the threshold magnitude (i.e., the trickle charge state of charge is not reached), a second control signal is output to control the output of the signal switching module 546 to communicate with the first input of the signal switching module 546 (i.e., with the output of the second proportional-integral controller 542), therefore, the signal switching module 546 outputs the output current reference value output by the second proportional-integral controller 542, the second comparing chip 543 compares the current charging current with the output current reference value to obtain the current deviation, the third proportional-integral controller 545 obtains the corresponding duty ratio according to the current deviation, the duty ratio enables the pulse signal generator 600 to generate a corresponding pulse signal, thereby feedback-adjusting the output current of the dc-dc converter circuit 200 to the output current corresponding to the maximum power point, and ensuring the rapid charging of the battery module 400.
Through this embodiment technical scheme, make battery module 400 carry out trickle charge when filling soon fully (reach trickle charge state) to make battery module 400 keep quick charge when the state of charge is lower, thereby both can realize that battery module 400 is full of more quick, simultaneously, prevent that battery module 400 from filling the excessive current charge when filling soon fully, guarantee battery module 400's security.
Specifically, the full-dc conversion circuit of this embodiment preferably employs a half-bridge inverter full-bridge rectification topology circuit, and is a preferred circuit scheme of this embodiment with reference to fig. 7. The dc conversion circuit 200 of this preferred embodiment includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first PNP-type transistor Q1, a second PNP-type transistor Q2, a first transformer T1, a first inductor L1, and a first full-bridge rectifier bridge BR1, where: the positive end of the input end Vin of the direct current conversion circuit 200 is connected with the negative end of the input end Vin of the direct current conversion circuit 200 through a first capacitor C1 and a second capacitor C2 in sequence; a collector of the first PNP transistor Q1 is connected to the positive terminal of the input terminal Vin of the dc conversion circuit 200, an emitter of the first PNP transistor Q1 is connected to a collector of the second PNP transistor Q2, an emitter of the second PNP transistor Q2 is connected to the negative terminal of the input terminal Vin of the dc conversion circuit 200, and a base of the first PNP transistor Q1 and a base of the second PNP transistor Q2 are controlled terminals of the dc conversion circuit 200; one end of a primary coil of the first transformer T1 is connected to an emitter of the first PNP triode Q1, the other end of the primary coil of the first transformer T1 is connected to a common end of the first capacitor C1 and the second capacitor C2 through the third capacitor C3, a secondary coil of the first transformer T1 is connected to an input end of the first full-bridge rectifier bridge BR1, a first end of the first inductor L1 is connected to an output positive terminal of the first full-bridge rectifier bridge BR1, a second end of the first inductor L1 is an output terminal of the dc conversion circuit 200, and a second end of the first inductor L1 is further connected to an output negative terminal of the first full-bridge rectifier bridge BR1 through the fourth capacitor C4 and the fifth capacitor C5, respectively.
In this embodiment, the first capacitor C1 and the second capacitor C2 perform voltage division, the third capacitor C3 performs dc blocking and ac blocking, and the first inductor L1 performs filtering; the fourth capacitor C4 can be an electrolytic capacitor with larger capacity to absorb low-order harmonic and maintain voltage, and the fifth capacitor C5 can be a film capacitor with smaller capacity to filter high-frequency disturbance; the first full bridge rectifier bridge BR1 is formed by four diodes (not numbered), and the first transformer T1 is preferably a forward transformer. The operating principle of the dc conversion circuit 200 of this embodiment is as follows: the pulse signals output by the pulse signal generator respectively control the conduction and the cut-off of the first PNP type triode Q1 and the second PNP type triode Q2, so that the output of the secondary side coil of the first transformer T1 is controlled and adjusted, the output of the secondary side coil of the first transformer T1 is rectified by the first full-bridge rectifier bridge BR1 and then filtered by the first inductor L1 and output to the direct current bus 300, and the storage battery module 400 is charged or externally powered.
Specifically, the full-dc conversion circuit of this embodiment preferably adopts a half-bridge inverter half-bridge rectification topology circuit, and fig. 8 is a preferred circuit scheme of this embodiment. The dc conversion circuit 200 of this preferred embodiment includes a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a third PNP-type transistor Q3, a fourth PNP-type transistor Q4, a second inductor L2, a second transformer T2, a first diode D1, and a second diode D2, where: the positive end of the input end Vin of the direct current conversion circuit 200 is connected with the negative end of the input end Vin of the direct current conversion circuit 200 through a sixth capacitor C6 and a seventh capacitor C7 in sequence; a collector of the third PNP transistor Q3 is connected to the positive terminal of the input terminal Vin of the dc converter circuit 200, an emitter of the third PNP transistor Q3 is connected to a collector of the fourth PNP transistor Q4, an emitter of the fourth PNP transistor Q4 is connected to the negative terminal of the input terminal Vin of the dc converter circuit 200, and a base of the third PNP transistor Q3 and a base of the fourth PNP transistor Q4 are controlled terminals of the dc converter circuit 200; one end of a primary coil of the second transformer T2 is connected to an emitter of the third PNP triode Q3, the other end of the primary coil of the second transformer T2 is connected to a common end of the sixth capacitor C6 and the seventh capacitor C7 through the eighth capacitor C8, one end of a secondary coil of the second transformer T2 is connected to a first end of the second inductor L2 through the first diode D1, the second end of the second inductor L2 is an output end Vout of the dc conversion circuit 200, the other end of the secondary coil of the second transformer T2 is connected to a first end of the first inductor L1 through the second diode D2, and the second end of the second inductor L2 is connected to a center tap of the secondary coil of the second transformer T2 through the ninth capacitor C9 and the tenth capacitor C10, respectively.
The structure of the dc conversion circuit 200 of the present embodiment is similar to that of the first embodiment, except that: the present embodiment has a half-bridge rectification structure formed by a first diode D1 and a second diode D2, and the secondary winding of the second transformer T2 has a center tap. The operating principle of the dc converter circuit 200 of this embodiment is the same as that of the dc converter circuit 200 of the first embodiment, and is not described again.
Specifically, the full-dc conversion circuit of this embodiment preferably employs a full-bridge LLC resonant inverter full-bridge rectification topology circuit, and is a preferred circuit scheme of this embodiment with reference to fig. 9. The dc conversion circuit 200 of this preferred embodiment includes an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifth PNP-type transistor Q5, a sixth PNP-type transistor Q6, a seventh PNP-type transistor Q7, an eighth PNP-type transistor Q8, a third inductor L3, a fourth inductor L4, a second full-bridge rectifier bridge BR2, and a third transformer T3, where: the eleventh capacitor C11 is connected between the positive and negative terminals of the input terminal Vin of the dc-dc converter circuit 200; a collector of the fifth PNP transistor Q5 is connected to the positive terminal of the input terminal Vin of the dc-to-dc converter circuit 200, an emitter of the fifth PNP transistor Q5 is connected to a collector of the sixth PNP transistor Q6, and an emitter of the sixth PNP transistor Q6 is connected to the negative terminal of the input terminal Vin of the dc-to-dc converter circuit 200; a collector of the seventh PNP transistor Q7 is connected to the positive terminal of the input terminal Vin of the dc-to-dc converter circuit 200, an emitter of the seventh PNP transistor Q7 is connected to the collector of the eighth PNP transistor Q8, and an emitter of the seventh PNP transistor Q7 is connected to the negative terminal of the input terminal Vin of the dc-to-dc converter circuit 200; the base of the fifth PNP triode Q5, the base of the sixth PNP triode Q6, the base of the seventh PNP triode Q7, and the base of the eighth PNP triode Q8 are controlled terminals of the dc-to-dc converter circuit 200; one end of a primary coil of the third transformer T3 is connected to an emitter of the fifth PNP triode Q5 through a third inductor L3, the other end of the primary coil of the third transformer T3 is connected to an emitter of the seventh PNP triode Q7 through a twelfth capacitor C12, a secondary coil of the third transformer T3 is connected to an input end of the second full-bridge rectifier bridge BR2, a first end of the fourth inductor L4 is connected to an output positive end of the second full-bridge rectifier bridge BR2, a second end of the fourth inductor L4 is an output end Vout of the dc conversion circuit 200, and a second end of the fourth inductor L4 is further connected to an output negative end of the second full-bridge rectifier bridge BR2 through a thirteenth capacitor C13 and a fourteenth capacitor C14, respectively.
In this embodiment, the fifth PNP type triode Q5, the sixth PNP type triode Q6, the seventh PNP type triode Q7, and the eighth PNP type triode Q8 form a dual-leg inverter bridge, a resonant capacitor (i.e., a twelfth capacitor C12) is inserted between the front inverter bridge (i.e., the seventh PNP type triode Q7 and the eighth PNP type triode Q8) and the third transformer T3, and then a resonant circuit of an LLC is formed in cooperation with a leakage inductance (i.e., a third inductor L3) of the third transformer T3, thereby realizing zero-voltage turn-on or zero-current turn-off; the secondary winding side of the third transformer T3 is a rectifying portion. The principle is as follows: the pulse signals generated by the pulse signal generator 600 are also used to control the on/off operation of the resonant circuit of the LLC, so as to control and regulate the output of the third transformer T3, and thus regulate the output of the dc converter circuit 200.
Further, referring to fig. 10, the dc converter circuit 200 of this embodiment further includes a first resistor R1, a third diode D3, and a fifteenth capacitor C15, wherein one end of the first resistor R1 is connected to the first end of the fourth inductor L4, the other end of the first resistor R1 is connected to the second end of the fourth inductor L4 through the third diode D3, and the fifteenth capacitor C15 is connected in parallel to the first resistor R1.
An RCD reverse absorption loop is formed by the first resistor R1, the fifteenth capacitor C15 and the third diode D3 and is connected in parallel with two ends of the fourth inductor L4, so that the magnetic bias phenomenon of the fourth inductor L4 can be prevented, and the reliability of the direct current conversion circuit 200 is improved.
Specifically, the full dc conversion circuit of this embodiment preferably adopts an interleaved flyback dc conversion topology circuit, which is a preferred circuit scheme of this embodiment with reference to fig. 11. The dc conversion circuit 200 of this preferred embodiment includes a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a ninth PNP transistor Q9, a tenth PNP transistor Q10, a fourth diode D4, a fifth diode D5, a fifth inductor L5, a fourth transformer T4, and a fifth transformer T5, where: the sixteenth capacitor C16 is connected between the positive and negative terminals of the input terminal Vin of the dc-dc converter circuit 200; one end of the primary coil of the fourth transformer T4 is connected to the positive end of the input terminal Vin of the dc-to-dc converter circuit 200, the other end of the primary coil of the fourth transformer T4 is connected to the collector of the ninth PNP transistor Q9, the emitter of the ninth PNP transistor Q9 is connected to the negative end of the input terminal Vin of the dc-to-dc converter circuit 200, one end of the secondary coil of the fourth transformer T4 is connected to the first end of the fifth inductor L5 via the fourth diode D4, the second end of the fifth inductor L5 is the output terminal Vout of the dc-to-dc converter circuit 200, and the second end of the fifth inductor L5 is also connected to the other end of the secondary coil of the fourth transformer T4 via the seventeenth capacitor C17 and the eighteenth capacitor C18, respectively; one end of the primary winding of the fifth transformer T5 is connected to the positive terminal of the input terminal Vin of the dc conversion circuit 200, the other end of the primary winding of the fifth transformer T5 is connected to the collector of the tenth PNP transistor Q10, the emitter of the tenth PNP transistor Q10 is connected to the negative terminal of the input terminal Vin of the dc conversion circuit 200, one end of the secondary winding of the fifth transformer T5 is connected to the other end of the secondary winding of the fourth transformer T4, and the other end of the secondary winding of the fifth transformer T5 is connected to the first end of the fifth inductor L5 via the fifth diode D5.
Two flyback transformers (i.e., the fourth transformer T4 and the fifth transformer T5) connected in parallel are adopted, and the circuit is simple in structure and good in safety.
Specifically, the full dc conversion circuit of this embodiment preferably adopts a push-pull dc conversion topology circuit, which is a preferred circuit scheme of this embodiment with reference to fig. 12. The dc conversion circuit 200 of this preferred embodiment includes a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, an eleventh PNP transistor Q11, a twelfth PNP transistor Q12, a sixth diode D6, a seventh diode D7, an eighth diode D8, a ninth diode D9, a sixth inductor L6, and a sixth transformer T6, where: the nineteenth capacitor C19 is connected between the positive and negative terminals of the input terminal Vin of the dc-dc converter circuit 200; a collector of the eleventh PNP type triode Q11 is connected to one end of the primary winding of the sixth transformer T6, an emitter of the twelfth PNP type triode Q12 is connected to the other end of the primary winding of the sixth transformer T6, an emitter of the eleventh PNP type triode Q11 and a collector of the twelfth PNP type triode Q12 are connected to a negative terminal of an input terminal Vin of the dc conversion circuit 200, and a base of the eleventh PNP type triode Q11 and a base of the twelfth PNP type triode Q12 are controlled terminals of the dc conversion circuit 200; a central tap of a primary winding of the sixth transformer T6 is connected to a positive terminal of an input terminal Vin of the dc conversion circuit 200, one end of a secondary winding of the sixth transformer T6 is connected to a first end of a sixth inductor L6 through a sixth diode D6, the other end of the secondary winding of the sixth transformer T6 is connected to a first end of a sixth inductor L6 through an eighth diode D8, and a second end of the sixth inductor L6 is an output terminal Vout of the dc conversion circuit 200; one end of a twentieth capacitor C20 is connected to the second end of the sixth inductor L6, the other end of the twentieth capacitor C20 is connected to one end of the secondary winding of the sixth transformer T6 via a seventh diode D7, the other end of the twentieth capacitor C20 is further connected to the other end of the secondary winding of the sixth transformer T6 via a ninth diode D9, and the twenty-first capacitor C21 is connected in parallel to the twentieth capacitor C20.
Specifically, the full-dc conversion circuit of this embodiment preferably uses a dual-transistor forward dc conversion topology circuit, and fig. 13 is a preferred circuit scheme of this embodiment. The dc conversion circuit 200 of the preferred embodiment includes a twenty-second capacitor C22, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a thirteenth PNP-type transistor Q13, a fourteenth PNP-type transistor Q14, a twelfth diode D10, an eleventh diode D11, a twelfth diode D12, a thirteenth diode D13, a fourteenth diode D14, a fifteenth diode D15, a seventh inductor L7, and a seventh transformer T7, wherein: the twenty-second capacitor C22 is connected between the positive and negative terminals of the input terminal Vin of the dc-dc converter circuit 200; one end of the primary coil of the seventh transformer T7 is connected to the emitter of the thirteenth PNP transistor Q13, the other end of the primary coil of the seventh transformer T7 is connected to the collector of the fourteenth PNP transistor Q14, the other end of the primary coil of the seventh transformer T7 is further connected to the positive terminal of the input Vin of the dc-to-dc conversion circuit 200 through the twelfth diode D10, the collector of the thirteenth PNP transistor Q13 is connected to the positive terminal of the input Vin of the dc-to-dc conversion circuit 200, the emitter of the fourteenth PNP transistor Q14 is connected to the negative terminal of the input Vin of the dc-to-dc conversion circuit 200, the emitter of the fourteenth PNP transistor Q14 is further connected to the emitter of the thirteenth PNP transistor Q13 through the eleventh diode D11, and the bases of the thirteenth and fourteenth PNP transistors Q13 and Q14 are controlled terminals of the dc-to-dc conversion circuit 200; a first end of a secondary winding of the seventh transformer T7 is connected to a first end of a seventh inductor L7 through a twelfth diode D12, another end of the secondary winding of the seventh transformer T7 is connected to a first end of a seventh inductor L7 through a fourteenth diode D14, and a second end of the seventh inductor L7 is an output end Vout of the dc conversion circuit 200; one end of a twenty-third capacitor C23 is connected to the second end of the seventh inductor L7, the other end of the twenty-third capacitor C23 is connected to one end of the secondary winding of the seventh transformer T7 via a thirteenth diode D13, the other end of the twenty-third capacitor C23 is further connected to the other end of the secondary winding of the seventh transformer T7 via a fifteenth diode D15, and the twenty-fourth capacitor C24 is connected in parallel to the twenty-third capacitor C23.
Two power switching devices (namely, a thirteenth PNP transistor Q13 and a fourteenth PNP transistor Q14) of the dc conversion circuit 200 of the present embodiment are respectively connected to two ends of a primary coil of a seventh transformer T7, then, a twelfth diode D10 is connected to a positive end of an input terminal Vin of the dc conversion circuit 200 and a lower end of a primary coil of a seventh transformer T7 (namely, the other end of a primary coil of a seventh transformer T7), and an eleventh diode D11 is connected to an upper end of a primary coil of the seventh transformer T7 and a negative end of the input terminal Vin of the dc conversion circuit 200, so that the circuit does not have a direct connection phenomenon of two power switching tubes, and reliability and safety of the system are improved.
It should be noted that, in the above embodiment, all the PNP type triodes can be replaced by other switching tubes or power switching modules with the same function; the present invention only lists the above-mentioned several topologies as the preferred embodiments of the dc conversion circuit 200, and the dc conversion circuit 200 may also be other types of topologies.
The invention also provides a photovoltaic air conditioning system, which comprises a full direct current air conditioner 700 and a photovoltaic power supply device, and referring to fig. 14. The specific structure of the photovoltaic power supply device refers to the above embodiments, and since the photovoltaic air conditioning system adopts all the technical solutions of all the above embodiments, all the beneficial effects brought by the technical solutions of the above embodiments are also achieved, and are not repeated herein. The full dc air conditioner 700 is connected to the dc bus 300 of the photovoltaic power supply device. Preferably, the all-dc air conditioner 700 is a low-voltage all-dc air conditioner, which can improve the endurance of the battery module 400.
The invention further provides an automobile comprising the photovoltaic air conditioning system. The specific structure of the photovoltaic air conditioning system refers to the above embodiments, and since the automobile adopts all the technical solutions of all the above embodiments, all the beneficial effects brought by the technical solutions of the above embodiments are also achieved, and are not repeated herein. Wherein, full direct current air conditioner sets up and adorns in the space at the car, and photovoltaic power generation module locates the casing outside of car.
It should be noted that the technical solutions of the embodiments of the present invention can be combined with each other, but must be based on the realization of the technical solutions by those skilled in the art, and when the technical solutions are contradictory or can not be realized, the combination of the technical solutions should be considered to be absent and not to be within the protection scope of the present invention.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention.
Claims (7)
1. The utility model provides a photovoltaic power supply unit, its characterized in that includes photovoltaic power generation module, direct current converting circuit, direct current output bus, battery module, duty cycle regulating circuit and pulse generator, wherein:
the input end of the direct current conversion circuit is connected with the output end of the photovoltaic power generation module, and the output end of the direct current conversion circuit is output through a direct current bus;
the charging and discharging end of the storage battery module is connected with the direct current bus;
the input end of the duty ratio adjusting circuit is connected with the output end of the photovoltaic power generation module, the voltage and the current of the output end of the photovoltaic power generation module are sampled, and the duty ratio corresponding to the maximum power point is output according to the sampled voltage and current; the duty ratio input end of the pulse signal generator is connected with the output end of the duty ratio adjusting circuit, the output end of the pulse signal generator is connected with the controlled end of the direct current conversion circuit, and the pulse signal generator receives the duty ratio output by the duty ratio adjusting circuit, generates a corresponding pulse control signal according to the duty ratio and controls the work of the direct current conversion circuit;
the duty ratio adjusting circuit comprises a first sampling circuit, a maximum power point tracking controller, a first comparison chip and a duty ratio conversion circuit, wherein the input end of the first sampling circuit is connected with the output end of the photovoltaic power generation module, and the voltage and the current of the output end of the photovoltaic power generation module are sampled; a voltage output end of the first sampling circuit outputs sampled voltage to the maximum power point tracking controller, and a current output end of the first sampling circuit outputs sampled current to the maximum power point tracking controller; wherein,
the maximum power point tracking controller tracks the received voltage and current to output a reference voltage corresponding to the maximum power point; a first input end of the first comparison chip is connected with an output end of the maximum power point tracking controller, a second input end of the first comparison chip is connected with a voltage output end of the first sampling circuit, and an output end of the first comparison chip is connected with an input end of the duty ratio conversion circuit; the first comparison chip compares the voltages received by the first input end and the second input end of the first comparison chip to output voltage deviation to the duty ratio conversion circuit, and the duty ratio conversion circuit outputs corresponding duty ratio according to the received voltage deviation; or, the maximum power point tracking controller tracks the received voltage and current to output a reference current corresponding to the maximum power point; a first input end of the first comparison chip is connected with an output end of the maximum power point tracking controller, and a second input end of the first comparison chip is connected with a current output end of the first sampling circuit; the first comparison chip compares the currents received by the first input end and the second input end of the first comparison chip to output current deviation to the duty ratio conversion circuit, and the duty ratio conversion circuit outputs corresponding duty ratio according to the received voltage deviation;
the duty ratio adjusting circuit further comprises a signal switching module, a third sampling circuit, a charge state monitoring module and a charge curve planning module, wherein the third sampling circuit samples the voltage and the current of a charge and discharge end of the storage battery module and outputs the voltage and the current to the charge state monitoring module;
the duty ratio conversion circuit further comprises a second proportional-integral controller and a second comparison chip, wherein the input end of the second proportional-integral controller is the input end of the duty ratio conversion circuit, the output end of the second proportional-integral controller is connected with the first input end of the second comparison chip, the charging curve planning module outputs corresponding reference current to the first input end of the signal switching module according to the received charge state, the second input end of the signal switching module is connected with the output end of the second proportional-integral controller, and the output end of the signal switching module is connected with the first input end of the second comparison chip; when the state of charge of the storage battery reaches the preset threshold value, the state of charge monitoring module outputs a first control signal to control the first input end and the output end of the signal switching module to be communicated; and the charge state monitoring module outputs a second control signal to control the second input end of the signal switching module to be communicated with the output end when the charge state of the storage battery does not reach the preset threshold value.
2. The photovoltaic power supply device according to claim 1, wherein the duty cycle conversion circuit comprises a first proportional integral controller, an input end of the first proportional integral controller is an input end of the duty cycle conversion circuit, and an output end of the first proportional integral controller is an output end of the duty cycle conversion circuit; the first proportional integral controller outputs a corresponding duty ratio according to the electric signal received by the input end of the first proportional integral controller.
3. The photovoltaic power supply device according to claim 1, wherein the duty cycle conversion circuit includes a second sampling circuit and a third proportional-integral controller, the second sampling circuit samples the current at the output terminal of the dc conversion circuit and outputs the current to the second input terminal of the second comparison chip, the output terminal of the second comparison chip is connected to the input terminal of the third proportional-integral controller, and the output terminal of the third proportional-integral controller is the output terminal of the duty cycle conversion circuit;
the second proportional-integral controller outputs corresponding output reference current of the direct current conversion circuit according to the electric signal received by the input end of the second proportional-integral controller, the second comparison chip compares the output reference current with the current output by the second sampling circuit to obtain current deviation, and the third proportional-integral controller outputs corresponding duty ratio according to the received current deviation.
4. The pv power supply apparatus according to claim 1, wherein the dc conversion circuit is one of a half-bridge inverter full-bridge rectifier topology circuit, a half-bridge inverter half-bridge rectifier topology circuit, a full-bridge LLC resonant inverter full-bridge rectifier topology circuit, an interleaved flyback dc conversion topology circuit, a push-pull dc conversion topology circuit, and a dual-transistor forward dc conversion topology circuit.
5. A photovoltaic air conditioning system, characterized by comprising an all-DC air conditioner and a photovoltaic power supply device according to any one of claims 1 to 4, wherein the all-DC air conditioner is connected with the DC bus.
6. The photovoltaic air conditioning system of claim 5, wherein the all-DC air conditioner is a low-voltage all-DC air conditioner.
7. An automobile, characterized by comprising the photovoltaic air conditioning system as claimed in claim 5 or 6, wherein the full direct current air conditioner is arranged in the space of the automobile, and the photovoltaic power generation module is arranged outside the shell of the automobile.
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| CN106300622A (en) * | 2016-10-27 | 2017-01-04 | 广东美的制冷设备有限公司 | Solar air conditioner system and device |
| CN106487233A (en) * | 2016-11-24 | 2017-03-08 | 广东美的制冷设备有限公司 | The power supply circuits of solar air conditioner and solar air conditioner |
| CN106774610A (en) * | 2017-01-06 | 2017-05-31 | 青岛天盈华智科技有限公司 | A kind of MPPT control method and its device |
| CN112355994B (en) * | 2020-11-09 | 2022-02-15 | 三门核电有限公司 | Portable intelligent charging toolbox |
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| CN104935043A (en) | 2015-09-23 |
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