CN114243872A - Fill electric pile DC power supply unit and battery charging outfit - Google Patents
Fill electric pile DC power supply unit and battery charging outfit Download PDFInfo
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- CN114243872A CN114243872A CN202111312271.7A CN202111312271A CN114243872A CN 114243872 A CN114243872 A CN 114243872A CN 202111312271 A CN202111312271 A CN 202111312271A CN 114243872 A CN114243872 A CN 114243872A
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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
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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
- H02J7/007—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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model relates to an electric pile DC power supply device and battery charging outfit, electric pile DC power supply device includes the photovoltaic module of charging, the Boost converter, power charging module and control module, the photovoltaic module of charging connects the input side of Boost converter, the anodal interface of supplying power is connected to the output side positive pole of Boost converter, the electric wire netting is connected to the input side of power charging module, the output side negative pole of Boost converter is connected to the output side positive pole of power charging module, the output side negative pole of power charging module is connected the power supply negative pole 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, the control module controls the photovoltaic charging module and the power supply charging module to work according to the 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 photovoltaic and a power grid, the effective utilization of clean energy is guaranteed, the pressure of the power grid is relieved, and the photovoltaic charging control system is suitable for 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 automobiles, the construction of charging piles becomes the key for the long-term healthy development of the electric automobile industry. The problem of charging pile's centralized use causes regional distribution capacity not enough easily, effectively utilize clean energy can reduce the use of the traditional energy by a wide margin and account for the ratio, suitably alleviate energy supply pressure, improve energy utilization when reducing the gaseous emission of pollution. Considering that charging pile construction areas are mostly on the civil building side, the areas have good potential and advantages of photovoltaic laying, but instability of photovoltaic output also determines that power grid output is needed on the power supply side to meet supply and demand balance of a system with insufficient photovoltaic. How to control photovoltaic output and power grid output to adapt to photovoltaic change and various charging requirements is a problem to be solved urgently.
Disclosure of Invention
Therefore, the charging pile direct-current power supply device and the charging equipment which can adapt to photovoltaic change and various charging requirements are needed to be provided for solving the problems.
A direct-current power supply device for a charging pile comprises 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 the charging pile, and 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 acquiring charging required power and controlling the photovoltaic charging module and the power supply charging module to work according to the charging required 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 required power.
In one embodiment, when the charging demand power is greater than the photovoltaic output power, the control module controls the photovoltaic charging module to work in the MPPT mode and adjusts the output voltage of the power supply charging module; when the charging demand 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 required power is smaller than the photovoltaic output power, the control module controls the photovoltaic charging module to switch to a power limiting mode and controls the power supply charging module to stop outputting the voltage.
In one embodiment, the charging pile dc power supply device further includes a switch Q1, a first end of the switch Q1 is connected to the positive electrode of the output side of the Boost converter, and a second end of the switch Q1 is connected to the negative electrode of the output side of the Boost converter.
In one embodiment, the switch Q1 is a control switch, and the control terminal of the switch Q1 is connected to the control module; the control module also controls the switch Q1 to close when there is no photovoltaic output from the photovoltaic charging module and controls the switch Q1 to open when there is photovoltaic output from the photovoltaic charging module.
In one embodiment, the Boost converter comprises 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 positive power supply 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 a 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 terminal 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 anode of the DC-DC unit is connected to an output side cathode of the Boost converter, and an output side cathode of the DC-DC unit is connected to the power supply cathode 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 automobile 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, the control module controls the photovoltaic charging module and the power supply charging module to work according to the actual charging demand power, so that the overall output power is matched with the charging demand power, the power supply control is realized by combining photovoltaic and a power grid, the effective utilization of clean energy is guaranteed, the pressure of the power grid is relieved, and the electric pile direct-current power supply device and the charging equipment are adaptable to photovoltaic change and various charging demands.
Drawings
Fig. 1 is a schematic diagram of a topology of a dc charging pile in an existing ac system;
fig. 2 is a schematic diagram of a topology structure of a dc charging pile in a conventional dc system;
fig. 3 is a schematic diagram of a topology of a dc charging pile provided in the present application;
FIG. 4 is a schematic diagram of an embodiment of a charging pile DC power supply apparatus;
FIG. 5 is a schematic diagram illustrating the output current flow of the power charging module when the switch Q1 is not connected in parallel according to one embodiment;
FIG. 6 is a schematic diagram illustrating the output current flow of the power charging module with the parallel switch Q1 according to one embodiment;
FIG. 7 is an equivalent diagram of an embodiment of a DC power supply charging a battery;
fig. 8 is a schematic current flow diagram illustrating simultaneous operation of the photovoltaic charging module and the electric power charging module according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present 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 present 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. The "connection" in the following embodiments is understood as "electrical connection", "communication connection", or the like if the connected circuits, modules, units, or the like have electrical signals or data transmission therebetween.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, the terminology used in this specification includes any and all combinations of the associated listed items.
In the current alternating current system, a topological structure as shown in fig. 1 is generally adopted, three-level change is needed when electric energy flows from photovoltaic to a charging pile, and loss of an intermediate link is large. With the direct current of equipment in a civil scene, the advantage of low-voltage direct current power supply is shown, a topological structure shown in fig. 2 is generally adopted by a direct current system, primary conversion is reduced compared with an alternating current system, and intermediate loss is reduced. The application provides the topological structure shown in fig. 3, and can reduce one-stage intermediate links on the basis of the topological structure shown in fig. 2, thereby greatly improving the system efficiency.
In an embodiment, as shown in fig. 4, a charging pile dc power supply apparatus is provided, which includes a photovoltaic charging module 110, a Boost converter 120, a power charging module 130, and a control module, where the photovoltaic charging module 110 is connected to an input side of the Boost converter 120, an anode of an output side of the Boost converter 120 is connected to a power supply anode interface, an input side of the power charging module 130 is connected to a power grid, an anode of an output side of the power charging module 130 is connected to a cathode of the output side of the Boost converter 120, a cathode of the output side of the power charging module 130 is connected to a power supply cathode interface, the power supply anode interface and the power supply cathode interface are used for connecting a charging pile, and the control module is connected to a control terminal of the photovoltaic charging module 110 and a control terminal of the power charging module 130; the control module is configured to obtain a 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 an output power between the power supply positive interface and the power supply negative interface matches the charging demand power. The Control module may be a controller such as a CPU (Central Processing Unit), an MCU (Micro Control Unit), or the like. The charging pile is used for charging load equipment, and the load equipment can be an electric automobile or other electronic equipment. For convenience of understanding, the following description will be given by taking the charging pile as an example for charging the electric vehicle.
Specifically, when the charging pile charges the battery of the electric automobile, the charging demand power of the battery is acquired 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, so that the output power delivered to the charging pile is matched with the charging demand power. For example, the control module preferentially uses the photovoltaic charging module 110 to supply power when the photovoltaic charging module 110 has photovoltaic power output, and if the power of the photovoltaic charging module 110 is insufficient, the control module combines the photovoltaic charging module 110 and the power charging module 130 to supply power together. In addition, if the photovoltaic output of the photovoltaic charging module 110 is not generated due to reasons such as rainy weather or failure of the photovoltaic charging module 110, the control module separately supplies power by using the power charging module 130. Namely, 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 exists, the direct current power supply supports the charging power independently. The output power is matched with the charging demand power, and the output power may be equal to the charging demand power, or the difference between the output power and the charging demand power is within a preset error range.
In one embodiment, when the charging demand Power is greater than the photovoltaic output Power, the control module controls the photovoltaic charging module 110 to operate in an MPPT (Maximum Power Point Tracking) mode, and adjusts the output voltage of the Power charging module 130; 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 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-save the photovoltaic output power of the photovoltaic charging module 110 operating in the MPPT mode for saving. If the charging demand power of the battery is greater than the photovoltaic output power, it indicates that the photovoltaic charging module 110 cannot meet the charging demand power alone, and at this time, the control module adjusts the output voltage of the power supply 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 output power of the direct-current power supply 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 to be inoperative. Further, if the charging demand power of the battery is less than the photovoltaic output power, the control module disables the power charging module 130, controls the photovoltaic charging module 110 to switch to the power limiting mode, and reduces the output power of the photovoltaic charging module 110 to meet the charging demand power of the battery. In this embodiment, when there is photovoltaic output, then preferentially absorb photovoltaic under the condition of guaranteeing the load demand, reduce the energy supply pressure of direct current power supply side.
In one embodiment, with continued reference to fig. 4, the charging post dc power supply further includes a switch Q1, a first terminal of the switch Q1 is connected to the positive output side of the Boost converter 120, and a second terminal of the switch Q1 is connected to the negative output side of the Boost converter 120. By connecting the switch Q1 in parallel between the output-side positive electrode and the output-side negative electrode of the Boost converter 120, the switch Q1 can be closed when the photovoltaic charging module 110 has no photovoltaic output, the photovoltaic charging module 110 and the Boost converter 120 are short-circuited, the current output by the power charging module 130 is prevented from flowing through the Boost converter 120 to cause loss, and energy waste is reduced. Correspondingly, when the photovoltaic power is applied to the photovoltaic charging module 110, the switch Q1 is turned off, and then the photovoltaic charging module 110 is used to supply power alone or in combination with the photovoltaic charging module 110 and the power charging module 130.
The type of the switch Q1 is not exclusive and may be a hand-throw switch or a control switch controlled by an electrical signal. In one embodiment, the switch Q1 is a control switch, and the control terminal of the switch Q1 is connected to the control module; the control module also controls the switch Q1 to close when there is no photovoltaic power output from the photovoltaic charging module 110 and controls the switch Q1 to open when there is photovoltaic power output from the photovoltaic charging module. Whether photovoltaic output exists in the photovoltaic charging module 110 or not is detected through the control module, and the on-off state of the switch Q1 is correspondingly controlled, so that the control is more timely and accurate.
The specific structure of the Boost converter 120 is not exclusive, and 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 terminal 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 positive power supply interface, one end of the switch Q2 is connected to the common terminal of the inductor L1 and the diode D1, and the other end of the switch Q2 is connected to the negative output terminal of the photovoltaic charging module 110. The switch Q2 is a control switch, and the control end is connected to the control module. The control module controls the on/off of the switch Q2 to control the operation of the Boost converter 120, and processes the voltage output by the photovoltaic charging module 110, for example, Boost or buck the voltage output by the photovoltaic charging module 110 according to the actual charging requirement. Further, in one embodiment, the Boost converter 120 further includes a diode D2, a diode D2 is connected in parallel with the switch Q2, and a cathode of the diode D2 is connected to a common terminal of the inductor L1 and the diode D1.
In addition, in one embodiment, the Boost converter 120 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 terminal of the photovoltaic charging module 110. Specifically, the two ends of the capacitor C1 may be respectively used as the output-side positive electrode and the output-side negative electrode of the Boost converter 120, and the voltage may be regulated by the capacitor C1, so that the Boost converter 120 outputs a stable voltage. Correspondingly, the switch Q1 is connected in parallel with the capacitor C1, and the photovoltaic charging module 110 and the Boost converter 120 can be short-circuited by controlling the switch Q1 to be closed.
The structure of the power charging module 130 is 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 anode of the DC-DC unit is connected to an output side cathode of the Boost converter 120, and an output side cathode of the DC-DC unit is connected to the power supply cathode interface. The AC-DC unit is used for carrying out AC-DC conversion on the AC output by the power grid to obtain DC, the DC is transmitted to the DC-DC unit, and the DC-DC unit carries out DC-DC conversion on the received DC and then outputs the DC. In addition, the control module can be connected with the DC-DC unit, and the DC-DC unit is controlled to work 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, the control module controls the photovoltaic charging module 110 and the power supply charging module 130 to work according to the actual charging demand power, so that the overall output power is matched with the charging demand power, the power supply control is realized by combining photovoltaic and a power grid, the effective utilization of clean energy is guaranteed, the pressure of the power grid is relieved, and the electric pile direct-current power supply device is suitable for photovoltaic change and various charging demands.
In one embodiment, a charging device is also provided, which comprises a charging pile and the charging pile direct current power supply device. The charging pile is an electric automobile charging pile, when a battery of the electric automobile is charged, the charging demand power of the battery is acquired 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 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.
According to 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, the control module controls the photovoltaic charging module and the power supply charging module to work according to the 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 photovoltaic and a power grid, the effective utilization of clean energy is guaranteed, the pressure of the power grid is relieved, and the charging equipment is suitable for photovoltaic change and various charging demands.
In order to facilitate a better understanding of the above-described electric pile dc supply and charging apparatus, a detailed explanation is given below 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 photovoltaic charging combination, and a photovoltaic charging module is directly connected in series with a power supply charging module through a Boost converter to realize the effect of common energy supply of photovoltaic and power grid. Under the condition of photovoltaic output, both the photovoltaic power supply and the direct-current power supply can supply power to the load side; when no photovoltaic output exists, the direct current power supply supports the charging power independently. 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 can change the output voltage, switch the working mode and the like to adapt to different conditions. The following describes a specific implementation process:
1. as shown in fig. 4, the overall topology can be divided into three parts: photovoltaic charging module 110, Boost converter 120, 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 110 should be the same due to the series connection, and when no photovoltaic output exists, the current value is 0, and the power charging module 130 cannot output power, so that the Boost converter 120 is connected to the output end of the photovoltaic charging module 110, the output voltage can be raised, and the above situation can be avoided. And a switch Q1 is connected in parallel to the output side of the Boost converter 120, and when no output is generated in the photovoltaic system, the switch Q1 is closed to short-circuit the photovoltaic charging module 110 and the Boost converter 120, and at this time, the power charging module 130 operates. As shown in fig. 5 and 6, the parallel switch Q1 has the advantage that current does not flow through two diodes inside the Boost converter 120, reducing unnecessary conduction losses.
2. Analyzing the specific process of realizing the charging effect by the topological structure shown in fig. 4: the photovoltaic charging module 110 operates in the MPPT mode to ensure maximum photovoltaic consumption, U1 is the output voltage of the power charging module 130, U0 is the output voltage of the topology structure, and the output voltage of the photovoltaic charging module 110 is U0 to U1. The output current I may be adjusted by changing the magnitude of the output voltage U1 of the power charging module 130.
3. The method comprises the following steps of firstly analyzing the current and voltage in a system according to the existence or nonexistence of photovoltaic output:
a) and when no photovoltaic output exists, the switch Q1 is closed, and the direct current power supply supports the whole output power. At the moment, the energy supply end is a direct-current power supply, the energy receiving end is a battery, and the integral model can be simplified and equivalently determined to determine how the direct-current power supply changes to adapt to the requirement of battery charging. 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 photovoltaic output exists, the photovoltaic charging module operates in the MPPT mode, maximum power output is guaranteed, and energy supply pressure on the side of the direct-current power supply can be properly relieved by the operation mode. At this time, the switch Q1 is not closed, the current flows to the graph shown in fig. 8, and the output current I of the topology includes I1And l'PVTwo parts of which are I'PVOutput current I for photovoltaic charging modulePVThe changed current, I, flowing through the Boost converter1For the output current of the power charging module, the output voltage U1 of the power charging module can be changed to adjust the magnitude of the output current I, as will be analyzed below.
4. And then, specifically analyzing how the voltage U1 adjusts the output current I according to the charging requirement:
a) the charging requirement requires the photovoltaic charging module and the power supply charging module to work simultaneously: the photovoltaic charging module works in an MPPT mode, the photovoltaic is preferentially consumed, and the residual charging power is supplied by the power supply charging module. If the residual charging power is smaller, the charging demand current I1Smaller, the output voltage U1 of the power charging module needs to be reduced.
b) The required charging power only needs the photovoltaic charging module to work: at this time, the photovoltaic charging power is just equal to the charging demand power, that is, the residual charging power supplied by the power charging module is equal to 0, and at this time, the output voltage U1 of the power charging module drops to 0.
c) The charging requirement is less than the photovoltaic output power: at the moment, the required charging power is smaller, the photovoltaic output must be limited only by the supply of the photovoltaic charging module working in the MPPT mode, and the photovoltaic charging module is switched to the power limiting mode.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A charging pile direct-current power supply device 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 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 acquiring charging required power and controlling the photovoltaic charging module and the power supply charging module to work according to the charging required 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 required power.
2. The charging pile direct-current power supply device 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 supply charging module 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 to work in an MPPT mode and controls the power supply charging module to stop outputting voltage; and when the charging required power is smaller than the photovoltaic output power, the control module controls the photovoltaic charging module to switch to a power limiting mode and controls the power supply charging module to stop outputting the voltage.
3. The charging pile direct-current power supply device according to claim 1, further comprising 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.
4. The charging pile DC power supply device of claim 3, wherein the switch Q1 is a control switch, and a control end of the switch Q1 is connected with the control module; the control module also controls the switch Q1 to close when there is no photovoltaic output from the photovoltaic charging module and controls the switch Q1 to open when there is photovoltaic output from the photovoltaic charging module.
5. The charging pile direct-current power supply device 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 to the positive electrode 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 positive power supply 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 electrode output end of the photovoltaic charging module.
6. The charging pile dc power supply device of claim 5, wherein the Boost converter further comprises a diode D2, the diode D2 is connected in parallel with the switch Q2, and a cathode of the diode D2 is connected to a common terminal of the inductor L1 and the diode D1.
7. The charging pile direct-current power supply device according to claim 5, wherein the Boost converter further comprises a capacitor C1, one end of the capacitor C1 is connected with the cathode of the diode D1, and the other end of the capacitor C1 is connected with the negative output end of the photovoltaic charging module.
8. 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 with a power grid, an output side of the AC-DC unit is connected with an input side of the DC-DC unit, an output side anode of the DC-DC unit is connected with an output side cathode of the Boost converter, and an output side cathode of the DC-DC unit is connected with the power supply cathode interface.
9. A charging apparatus comprising a charging post and a charging post dc supply device as claimed in any one of claims 1 to 8.
10. The charging device according to claim 9, wherein the charging post is an electric vehicle charging post.
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| CN114726044A (en) * | 2022-04-19 | 2022-07-08 | 华为数字能源技术有限公司 | Power module, charging pile and power supply equipment |
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