CN114243872B - Charging pile direct-current power supply device and charging equipment - Google Patents
Charging pile direct-current power supply device and charging equipment Download PDFInfo
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- CN114243872B CN114243872B CN202111312271.7A CN202111312271A CN114243872B CN 114243872 B CN114243872 B CN 114243872B CN 202111312271 A CN202111312271 A CN 202111312271A CN 114243872 B CN114243872 B CN 114243872B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/50—Charging stations characterised by energy-storage or power-generation means
- B60L53/51—Photovoltaic means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
- H02J7/04—Regulation of charging current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering with light sensitive cells
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application relates to an electric pile direct current power supply device and charging equipment, wherein the electric pile direct current power supply device comprises a photovoltaic charging module, a Boost converter, a power supply charging module and a control module, the photovoltaic charging module is connected with the input side of the Boost converter, the positive electrode of the output side of the Boost converter is connected with a power supply positive electrode interface, the input side of the power supply charging module is connected with a power grid, the positive electrode of the output side of the power supply charging module is connected with the negative electrode of the output side of the Boost converter, and the negative electrode of the output side of the power supply charging module is connected with the power supply negative electrode interface. The output side of the power supply charging module and the output side of the Boost converter are connected in series to supply power to the charging pile, and the control module controls the photovoltaic charging module and the power supply charging module to work according to actual charging demand power, so that the integral output power is matched with the charging demand power, the power supply control is realized by combining the photovoltaic and a power grid, the effective utilization of clean energy is ensured, the power grid pressure is relieved, and the photovoltaic charging module can adapt to photovoltaic change and various charging demands.
Description
Technical Field
The application relates to the technical field of charging management, in particular to a charging pile direct current power supply device and charging equipment.
Background
Along with the continuous popularization and development of electric vehicles, the construction of the charging pile becomes a key for the long-term healthy development of the electric vehicle industry. Considering the problem that the centralized use of the charging piles easily causes insufficient regional distribution capacity, the clean energy can be effectively utilized to greatly reduce the use ratio of the traditional energy, the energy supply pressure is properly relieved, and the energy utilization rate is improved while the emission of the polluted gas is reduced. Considering that the charging pile construction area is mostly on the civil building side, the area has good potential and advantage of paving the photovoltaic, but the instability of the photovoltaic output also determines that the power source side needs to have power grid output to meet the system supply and demand balance of the photovoltaic deficiency. How to control photovoltaic output and grid output to adapt to photovoltaic change and various charging requirements is a problem to be solved urgently.
Disclosure of Invention
Based on the above, it is necessary to provide a charging pile direct current power supply device and a charging device which can adapt to photovoltaic changes and various charging requirements.
The charging pile direct-current power supply device comprises a photovoltaic charging module, a Boost converter, a power supply charging module and a control module, wherein the photovoltaic charging module is connected with the input side of the Boost converter, the positive electrode of the output side of the Boost converter is connected with a power supply positive electrode interface, the input side of the power supply charging module is connected with a power grid, the positive electrode of the output side of the power supply charging module is connected with the negative electrode of the output side of the Boost converter, the negative electrode of the output side of the power supply charging module is connected with a power supply negative electrode interface, the power supply positive electrode interface and the power supply negative electrode interface are used for connecting a charging pile, and the control module is connected with the control end of the photovoltaic charging module and the control end of the power supply charging module; the control module is used for obtaining charging demand power and controlling the photovoltaic charging module and the power supply charging module to work according to the charging demand power so as to enable output power between the power supply positive electrode interface and the power supply negative electrode interface to be matched with the charging demand power.
In one embodiment, when the charging required power is greater than the photovoltaic output power, the control module controls the photovoltaic charging module to work in an MPPT mode and adjusts the output voltage of the power supply charging module; when the charging required power is equal to the photovoltaic output power, the control module controls the photovoltaic charging module to work in an MPPT mode and controls the power supply charging module to stop outputting voltage; and when the charging demand power is smaller than the photovoltaic output power, the control module controls the photovoltaic charging module to switch into a power limiting mode and controls the power charging module to stop outputting voltage.
In one embodiment, the charging pile direct current power supply device further comprises a switch Q1, a first end of the switch Q1 is connected with an output side positive electrode of the Boost converter, and a second end of the switch Q1 is connected with an output side negative electrode of the Boost converter.
In one embodiment, the switch Q1 is a control switch, and a control end of the switch Q1 is connected to the control module; the control module also controls the switch Q1 to be closed when the photovoltaic charging module has no photovoltaic output, and controls the switch Q1 to be opened when the photovoltaic charging module has the photovoltaic output.
In one embodiment, the Boost converter includes an inductor L1, a switch Q2 and a diode D1, one end of the inductor L1 is connected to the positive output end of the photovoltaic charging module, the other end of the inductor L1 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the power supply positive interface, one end of the switch Q2 is connected to the common end of the inductor L1 and the diode D1, and the other end of the switch Q2 is connected to the negative output end of the photovoltaic charging module.
In one embodiment, the Boost converter further includes a diode D2, the diode D2 is connected in parallel with the switch Q2, and a cathode of the diode D2 is connected to the common terminal of the inductor L1 and the diode D1.
In one embodiment, the Boost converter further includes a capacitor C1, one end of the capacitor C1 is connected to the cathode of the diode D1, and the other end of the capacitor C1 is connected to the negative output end of the photovoltaic charging module.
In one embodiment, the power charging module comprises an AC-DC unit and a DC-DC unit, wherein an input side of the AC-DC unit is connected to a power grid, an output side of the AC-DC unit is connected to an input side of the DC-DC unit, an output side positive electrode of the DC-DC unit is connected to an output side negative electrode of the Boost converter, and an output side negative electrode of the DC-DC unit is connected to the power supply negative electrode interface.
A charging device comprises a charging pile and the charging pile direct current power supply device.
In one embodiment, the charging pile is an electric vehicle charging pile.
According to the electric pile direct current power supply device and the charging equipment, the output side of the power supply charging module and the output side of the Boost converter are connected in series to supply power to the charging pile, and the control module controls the photovoltaic charging module and the power supply charging module to work according to actual charging demand power, so that the integral output power is matched with the charging demand power, and the power supply control is realized by combining the photovoltaic and a power grid, thereby not only ensuring the effective utilization of clean energy, but also relieving the power grid pressure, and being applicable to photovoltaic change and various charging demands.
Drawings
Fig. 1 is a schematic diagram of a topology structure of a dc charging pile in an existing ac system;
fig. 2 is a schematic diagram of a dc charging pile topology in a conventional dc system;
fig. 3 is a schematic diagram of a topological structure of a dc charging pile provided by the application;
Fig. 4 is a schematic structural diagram of a dc power supply device for a charging pile according to an embodiment;
FIG. 5 is a schematic diagram illustrating an output current flow of the power charging module without the parallel switch Q1 according to an embodiment;
FIG. 6 is a schematic diagram illustrating an output current flow of the power charging module with a parallel switch Q1 according to an embodiment;
FIG. 7 is an equivalent diagram of a DC power supply charging a battery according to an embodiment;
Fig. 8 is a schematic diagram of current flow when the photovoltaic charging module and the electric power charging module operate simultaneously in an embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. In the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", and the like, if the connected circuits, modules, units, and the like have electrical or data transferred therebetween.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Meanwhile, the term used in the present specification includes any and all combinations of the items listed in association.
In the current alternating current system, a topological structure shown in fig. 1 is generally adopted, electric energy needs to be changed from a photovoltaic current to a charging pile through three stages, and the loss of an intermediate link is large. With the DC of the equipment in civil scenes, the advantage of low-voltage DC power supply is revealed, the DC system generally adopts a topological structure as shown in figure 2, and compared with the AC system, the DC system reduces primary conversion and intermediate loss. The application provides the topological structure shown in fig. 3, and the first-stage intermediate links can be reduced on the basis of the topological structure shown in fig. 2, so that the system efficiency is greatly improved.
In one embodiment, as shown in fig. 4, a charging pile direct current power supply device is provided, which includes a photovoltaic charging module 110, a Boost converter 120, a power charging module 130 and a control module, wherein the photovoltaic charging module 110 is connected with an input side of the Boost converter 120, an output side positive electrode of the Boost converter 120 is connected with a power supply positive electrode interface, an input side of the power charging module 130 is connected with a power grid, an output side positive electrode of the power charging module 130 is connected with an output side negative electrode of the Boost converter 120, an output side negative electrode of the power charging module 130 is connected with a power supply negative electrode interface, the power supply positive electrode interface and the power supply negative electrode interface are used for connecting a charging pile, and the control module is connected with a control end of the photovoltaic charging module 110 and a control end of the power charging module 130; the control module is configured to obtain the charging demand power, and control the photovoltaic charging module 110 and the power charging module 130 to operate according to the charging demand power, so that the output power between the power supply positive electrode interface and the power supply negative electrode interface is matched with the charging demand power. The control module may be a controller such as a CPU (Central Processing Unit ), an MCU (Micro Control Unit, micro control unit), etc. The charging stake is used for charging the load equipment, and the load equipment can be electric automobile or other electronic equipment. For easy understanding, the charging pile is used to charge the electric vehicle.
Specifically, when the charging pile charges a battery of the electric automobile, the charging demand power of the battery is obtained through the vehicle-mounted battery management circuit, and the charging demand power of the battery is sent to the control module. The control module controls the photovoltaic charging module 110 and the power charging module 130 according to the charging demand power of the battery such that the output power delivered to the charging post matches the charging demand power. For example, the control module preferably uses the photovoltaic charging module 110 to supply power when the photovoltaic charging module 110 has a photovoltaic output, and combines the photovoltaic charging module 110 and the power charging module 130 to supply power if the photovoltaic charging module 110 is not sufficiently powered. In addition, if the photovoltaic charging module 110 fails due to overcast and rainy weather or the photovoltaic charging module 110 fails, the control module uses the power charging module 130 to independently supply power. That is, under the condition of photovoltaic output, both the photovoltaic power supply and the direct current power supply can supply energy to the load side; when no photovoltaic output force exists, the direct current power supply alone supports charging power. The output power is matched with the charging demand power, which may mean that the output power is equal to the charging demand power, or that the difference between the output power and the charging demand power is within a preset error range.
In one embodiment, the control module controls the photovoltaic charging module 110 to operate in the MPPT (Maximum Power Point Tracking ) mode and adjusts the output voltage of the power charging module 130 when the charging demand power is greater than the photovoltaic output power; when the charging demand power is equal to the photovoltaic output power, the control module controls the photovoltaic charging module 110 to work in the MPPT mode and controls the power supply charging module 130 to stop outputting the voltage; when the charging demand power is smaller than the photovoltaic output power, the control module controls the photovoltaic charging module 110 to switch to the power limiting mode, and controls the power charging module 130 to stop outputting the voltage.
Specifically, the control module may pre-store the photovoltaic output power of the photovoltaic charging module 110 operating in the MPPT mode for storage. If the charging demand power of the battery is greater than the photovoltaic output power, it indicates that the photovoltaic charging module 110 cannot separately meet the charging demand power, and at this time, the control module adjusts the output voltage of the power charging module 130 according to the difference between the charging demand power and the photovoltaic output power on the basis of controlling the photovoltaic charging module 110 to operate in the MPPT mode, so that the sum of the photovoltaic output power and the dc power output power meets the charging demand power of the battery. If the charging demand power of the battery is equal to the photovoltaic output power, it indicates that the charging demand can be satisfied only by operating the photovoltaic charging module 110, and at this time, the control module controls the photovoltaic charging module 110 to operate in the MPPT mode and controls the power charging module 130 not to operate. Further, if the charging demand power of the battery is smaller than the photovoltaic output power, the control module disables the power charging module 130 and controls the photovoltaic charging module 110 to switch to the limited power mode, so as to reduce the output power of the photovoltaic charging module 110 to meet the charging demand power of the battery. In this embodiment, when there is a photovoltaic output, the photovoltaic is preferentially consumed under the condition of ensuring the load demand, and the energy supply pressure of the dc power supply side is reduced.
In one embodiment, with continued reference to fig. 4, the charging pile dc power supply device further includes a switch Q1, a first terminal of the switch Q1 is connected to an output side positive electrode of the Boost converter 120, and a second terminal of the switch Q1 is connected to an output side negative electrode of the Boost converter 120. By connecting the switch Q1 in parallel with the positive electrode and the negative electrode of the output side of the Boost converter 120, the switch Q1 can be closed when the photovoltaic charging module 110 does not have a photovoltaic output force, so that the photovoltaic charging module 110 and the Boost converter 120 are short-circuited, the loss caused by the current output by the power charging module 130 flowing through the Boost converter 120 is avoided, and the energy waste is reduced. Correspondingly, when the photovoltaic charging module 110 has photovoltaic output, the switch Q1 is turned off, and then the photovoltaic charging module 110 is used for independently supplying power according to practical situations, or the photovoltaic charging module 110 and the power charging module 130 are combined for supplying power simultaneously.
The type of the switch Q1 is not limited, and may be a hand-throw switch or a control switch controlled by an electric signal. In one embodiment, the switch Q1 is a control switch, and a control end of the switch Q1 is connected to the control module; the control module also controls the switch Q1 to be closed when the photovoltaic charging module 110 has no photovoltaic output, and controls the switch Q1 to be opened when the photovoltaic charging module has photovoltaic output. The control module detects whether the photovoltaic charging module 110 has photovoltaic output or not, and corresponds to the on-off state of the control switch Q1, so that the control is more timely and accurate.
The specific structure of the Boost converter 120 is not unique, in one embodiment, the Boost converter 120 includes an inductor L1, a switch Q2, and a diode D1, one end of the inductor L1 is connected to the positive output end of the photovoltaic charging module 110, the other end of the inductor L1 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the power supply positive interface, one end of the switch Q2 is connected to the common end of the inductor L1 and the diode D1, and the other end of the switch Q2 is connected to the negative output end of the photovoltaic charging module 110. The switch Q2 is a control switch, and the control end is connected with the control module. The Boost converter 120 is controlled to work by controlling the on-off state of the switch Q2 through the control module, so as to process the voltage output by the photovoltaic charging module 110, for example, step-up or step-down processing is performed on the voltage output by the photovoltaic charging module 110 according to the actual charging requirement. Further, in one embodiment, boost converter 120 further includes a diode D2, diode D2 is connected in parallel with switch Q2, and a cathode of diode D2 is connected to a common terminal of inductor L1 and diode D1.
In addition, in one embodiment, boost converter 120 further includes a capacitor C1, one end of capacitor C1 is connected to the cathode of diode D1, and the other end of capacitor C1 is connected to the negative output terminal of photovoltaic charging module 110. Specifically, both ends of the capacitor C1 may be respectively used as an output side positive electrode and an output side negative electrode of the Boost converter 120, and the voltage is stabilized by the capacitor C1, so that the Boost converter 120 outputs a stabilized voltage. Correspondingly, the switch Q1 is connected in parallel with the capacitor C1, and by controlling the switch Q1 to be closed, the photovoltaic charging module 110 and the Boost converter 120 can be short-circuited.
The configuration of the power charging module 130 is also not exclusive, and in one embodiment, the power charging module 130 includes an AC-DC unit and a DC-DC unit, an input side of the AC-DC unit is connected to the power grid, an output side of the AC-DC unit is connected to an input side of the DC-DC unit, an output side positive electrode of the DC-DC unit is connected to an output side negative electrode of the Boost converter 120, and an output side negative electrode of the DC-DC unit is connected to a power supply negative electrode interface. AC-DC conversion is carried out on alternating current output by a power grid by utilizing an AC-DC unit, direct current is obtained and is transmitted to a DC-DC unit, and the DC-DC unit carries out DC-DC conversion on received direct current and then outputs the direct current. In addition, the control module can be connected with the DC-DC unit, and the work of the DC-DC unit is controlled according to the actual power supply requirement, so that the output voltage of the DC-DC unit is changed.
According to the electric pile direct current power supply device, the output side of the power supply charging module 130 and the output side of the Boost converter 120 are connected in series to supply power to the charging pile, and the control module controls the photovoltaic charging module 110 and the power supply charging module 130 to work according to actual charging demand power, so that the overall output power is matched with the charging demand power, and the power supply control is realized by combining the photovoltaic and a power grid, thereby not only ensuring the effective utilization of clean energy, but also relieving the power grid pressure, and being applicable to photovoltaic change and various charging demands.
In one embodiment, a charging device is further provided, including a charging pile and the charging pile direct current power supply device. The charging pile is used for charging the electric automobile, and when the battery of the electric automobile is charged, the charging demand power of the battery is obtained through the vehicle-mounted battery management circuit and is sent to the control module. The control module controls the photovoltaic charging module and the power supply charging module according to the charging demand power of the battery, so that the output power transmitted to the charging pile is matched with the charging demand power.
Above-mentioned battery charging outfit, with the output side of power charging module and Boost converter series connection for charging the stake power supply, control module is according to actual charging demand power control photovoltaic charging module and power charging module work to make holistic output match with the charging demand power, realize combining photovoltaic and electric wire netting and carry out power supply control, both guaranteed clean energy's effective utilization, alleviateed electric wire netting pressure again, adaptable photovoltaic change and all kinds of charging demands.
In order to better understand the electric pile direct current power supply device and the charging equipment, the following description is made in detail with reference to specific embodiments.
In order to control photovoltaic output and power grid output to adapt to photovoltaic change and various charging requirements, the application provides a direct-current charging pile topological structure capable of realizing combination of photovoltaic charging. Under the condition of photovoltaic output, the photovoltaic power supply and the direct current power supply can supply energy to the load side; when no photovoltaic output force exists, the direct current power supply alone supports charging power. Smooth switching can be realized between the two modes, so that the effective utilization of clean energy is ensured, and the pressure of a power grid is relieved. Meanwhile, according to the dynamic change of the charging requirement, each module also changes the output voltage, switches the working mode and the like so as to adapt to different conditions. The following describes a specific implementation procedure:
1. As shown in fig. 4, the overall topology can be divided into three parts: photovoltaic charging module 110, boost converter 120, and power charging module 130. If the photovoltaic charging module 110 is directly connected in series with the power charging module 130, the current flowing through the photovoltaic charging module is the same due to the series connection, and the current value is 0 when no photovoltaic output is provided, the power charging module 130 cannot output power, so that the output end of the photovoltaic charging module 110 is connected with the Boost converter 120, which can raise the output voltage and avoid the above situation. And a switch Q1 is connected in parallel to the output side of the Boost converter 120, and when the photovoltaic power is not output, the switch Q1 is closed to short-circuit the photovoltaic power charging module 110 and the Boost converter 120, and the power charging module 130 operates at this time. As shown in fig. 5 and 6, the advantage of using the parallel switch Q1 is that current does not flow through two diodes inside the Boost converter 120, reducing unnecessary conduction losses.
2. The specific process of analyzing the topology structure as shown in fig. 4 to achieve the charging effect is as follows: the photovoltaic charging module 110 works according to the MPPT mode, so that maximum photovoltaic absorption is guaranteed, U1 is the output voltage of the power charging module 130, U0 is the output voltage of the topological structure, and then the output voltage of the photovoltaic charging module 110 is U0-U1. The output current I may be adjusted by varying the magnitude of the output voltage U1 of the power charging module 130.
3. Firstly, according to the existence of photovoltaic output, analyzing the current and voltage in the system:
a) When no photovoltaic force is applied, the switch Q1 is closed, and the whole output power is supported by the direct current power supply. At the moment, the energy supply end is a direct current power supply, the energy receiving end is a battery, and the whole model can be simplified and equivalent to determine how the direct current power supply changes to adapt to the charging requirement of the battery. As shown in fig. 7, when the battery charging current needs to be increased, the voltage U of the dc power supply is increased, so that the change of the charging current I can be satisfied by changing the output voltage of the power charging module.
B) When the photovoltaic output is available, the photovoltaic charging module is enabled to operate in an MPPT mode, maximum power output is guaranteed, and the operation mode can properly relieve the energy supply pressure of the direct current power supply side. At this time, the switch Q1 is not closed, the current flow chart is shown in fig. 8, the output current I of the topology structure includes two parts I 1 and I 'PV, where I' PV is the current after the output current I PV of the photovoltaic charging module flows through the Boost converter, I 1 is the output current of the power charging module, and the output voltage U1 of the power charging module can be changed to adjust the magnitude of the output current I.
4. How the output current I is regulated by the voltage U1 is then specifically analyzed according to the charging demand:
a) The charging requirement requires that the photovoltaic charging module and the power charging module work simultaneously: the photovoltaic charging module works in an MPPT mode, photovoltaic is preferentially consumed, and the residual charging power is supplied by the power supply charging module. If the remaining charging power is smaller, the charging demand current I 1 is smaller, and the output voltage U1 of the power charging module needs to be reduced.
B) The photovoltaic charging module is only required to work for charging required power: the photovoltaic charging power is exactly equal to the charging demand power, that is, the remaining charging power supplied by the power charging module is equal to 0, and the output voltage U1 of the power charging module drops to 0.
C) The charging requirement is smaller than the photovoltaic output power: at this time, the charging demand power is smaller, and the photovoltaic charging module which operates in the MPPT mode is still supplied with power which is still larger than the demand, and at this time, the photovoltaic output must be limited, and the photovoltaic charging module is switched to the limited power mode.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (8)
1. The direct-current power supply device for the charging pile is characterized by comprising a photovoltaic charging module, a Boost converter, a power charging module and a control module, wherein the photovoltaic charging module is connected with the input side of the Boost converter, the positive electrode of the output side of the Boost converter is connected with a power supply positive electrode interface, the input side of the power charging module is connected with a power grid, the positive electrode of the output side of the power charging module is connected with the negative electrode of the output side of the Boost converter, the negative electrode of the output side of the power charging module is connected with a power supply negative electrode interface, the power supply positive electrode interface and the power supply negative electrode interface are used for being connected with a charging pile, and the charging pile is used for charging load equipment; the control module is connected with the control end of the photovoltaic charging module and the control end of the power charging module; the control module is used for obtaining charging demand power and controlling the photovoltaic charging module and the power supply charging module to work according to the charging demand power so as to enable output power between the power supply positive electrode interface and the power supply negative electrode interface to be matched with the charging demand power;
the output side of the power supply charging module is connected with the output side of the Boost converter in series and then connected with the charging pile, and the control module controls the photovoltaic charging module and the power supply charging module to work;
The charging pile direct current power supply device further comprises a switch Q1, wherein a first end of the switch Q1 is connected with an output side positive electrode of the Boost converter, and a second end of the switch Q1 is connected with an output side negative electrode of the Boost converter; the switch Q1 is a control switch, and the control end of the switch Q1 is connected with the control module; the control module also controls the switch Q1 to be closed when the photovoltaic charging module has no photovoltaic output, and controls the switch Q1 to be opened when the photovoltaic charging module has the photovoltaic output.
2. The direct current power supply device of a charging pile according to claim 1, wherein the control module controls the photovoltaic charging module to work in an MPPT mode and adjusts the output voltage of the power charging module when the charging demand power is greater than the photovoltaic output power; when the charging required power is equal to the photovoltaic output power, the control module controls the photovoltaic charging module to work in an MPPT mode and controls the power supply charging module to stop outputting voltage; and when the charging demand power is smaller than the photovoltaic output power, the control module controls the photovoltaic charging module to switch into a power limiting mode and controls the power charging module to stop outputting voltage.
3. The direct current power supply device of a charging pile according to claim 1, wherein the Boost converter comprises an inductor L1, a switch Q2 and a diode D1, one end of the inductor L1 is connected with the positive output end of the photovoltaic charging module, the other end of the inductor L1 is connected with the anode of the diode D1, the cathode of the diode D1 is connected with the power supply positive interface, one end of the switch Q2 is connected with the common end of the inductor L1 and the diode D1, and the other end of the switch Q2 is connected with the negative output end of the photovoltaic charging module.
4. A charging pile dc power supply according to claim 3, characterized in that the Boost converter further comprises a diode D2, the diode D2 being connected in parallel with the switch Q2, and the cathode of the diode D2 being connected to the common terminal of the inductance L1 and the diode D1.
5. A charging pile direct current power supply device according to claim 3, wherein the Boost converter further comprises a capacitor C1, one end of the capacitor C1 is connected to the cathode of the diode D1, and the other end of the capacitor C1 is connected to the negative output end of the photovoltaic charging module.
6. The charging pile direct current power supply device according to claim 1, wherein the power supply charging module comprises an AC-DC unit and a DC-DC unit, an input side of the AC-DC unit is connected to a power grid, an output side of the AC-DC unit is connected to an input side of the DC-DC unit, an output side positive electrode of the DC-DC unit is connected to an output side negative electrode of the Boost converter, and an output side negative electrode of the DC-DC unit is connected to the power supply negative electrode interface.
7. A charging apparatus comprising a charging post and the charging post dc power supply device according to any one of claims 1 to 6.
8. The charging apparatus of claim 7, wherein the charging peg is an electric car charging peg.
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