CN117040079A - Charging system - Google Patents

Charging system Download PDF

Info

Publication number
CN117040079A
CN117040079A CN202310968464.0A CN202310968464A CN117040079A CN 117040079 A CN117040079 A CN 117040079A CN 202310968464 A CN202310968464 A CN 202310968464A CN 117040079 A CN117040079 A CN 117040079A
Authority
CN
China
Prior art keywords
module
circuit
power supply
detection circuit
branch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310968464.0A
Other languages
Chinese (zh)
Inventor
吕泽杰
赵文
杨金
李永发
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Digital Power Technologies Co Ltd
Original Assignee
Huawei Digital Power Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Digital Power Technologies Co Ltd filed Critical Huawei Digital Power Technologies Co Ltd
Priority to CN202310968464.0A priority Critical patent/CN117040079A/en
Publication of CN117040079A publication Critical patent/CN117040079A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • B60L53/20—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 characterised by converters located in the vehicle
    • B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
    • 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
    • B60L53/30—Constructional details of charging stations
    • B60L53/31—Charging columns specially adapted for electric vehicles
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • 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
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • 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
    • 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
    • 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 provides a charging system, which comprises an AC-DC module, a direct current bus, a first breaking device and a second breaking device, wherein the first DC-DC module and the second DC-DC module; the AC-DC module is used for converting alternating current output by the alternating current source into direct current and outputting the direct current to the direct current bus; the second DC-DC module is used for performing voltage conversion on direct current output by the direct current power supply and outputting the direct current to the direct current bus; the first DC-DC module is used for acquiring direct current from a direct current bus, converting the voltage and outputting the direct current to a load. By adopting the application, the breaking device in the charging system can provide effective insulation, the safety of the system is ensured, meanwhile, an alternating current power supply branch circuit formed by an alternating current source and an AC-DC module in the charging system and a direct current power supply branch circuit formed by a direct current source and a DC-DC module can be connected with a load through a direct current bus, the connection mode is simple, the stability of the system is improved, and the design cost is reduced.

Description

Charging system
Technical Field
The application relates to the technical field of power electronics, in particular to a charging system.
Background
In the field of power electronics technology, with rapid development of new energy industries, new energy products (e.g., electric vehicles) have been increasingly popular, and demands for energy (e.g., electric energy) have also been increasing. For example, in order to meet the electric energy demand of more electric vehicles, more charging piles need to be arranged, and a large number of charging piles are integrated into a charging system (for example, a charging system consisting of an alternating current power supply branch, a photovoltaic power supply branch and a pure energy storage power supply branch, etc.), so that not only is a higher requirement on the safety of the charging system, but also a higher requirement on the stability of the charging system is provided. The inventor of the present application finds that in the prior art, the connection relationship between an ac power supply branch, a photovoltaic power supply branch and/or a pure energy storage power supply branch in a charging system and a charging pile (or a load) is relatively disordered (for example, the ac power supply branch is connected with the load through an ac bus, and the photovoltaic power supply branch and/or the pure energy storage power supply branch is connected with the load through a dc bus), so that the system stability is poor; or the insulation of the charging system is not clear (e.g., there is no insulation between the AC source and the AC-DC module in the AC power branch, or there is no insulation between the photovoltaic source and the DC-DC module in the photovoltaic power branch, etc.), resulting in poor system safety.
Disclosure of Invention
The application provides a charging system, which can provide effective insulation through a breaking device in the charging system, ensure the safety of the system, and simultaneously, an alternating current power supply branch circuit formed by an alternating current source and an AC-DC module in the charging system and a direct current power supply branch circuit formed by a direct current source and a DC-DC module can be connected with a load through a direct current bus, so that the connection mode is simple, the stability of the system is improved, and the design cost is reduced.
In a first aspect, the present application provides a charging system that may include an AC-DC module, a plurality of DC-DC-DC modules, a DC bus, a plurality of breaking devices including a first breaking device and a second breaking device, and a plurality of DC-DC modules including a first DC-DC module and a second DC-DC module. The AC-DC module can be connected with an alternating current source through the first breaking device, and the AC-DC module can be used for converting alternating current output by the alternating current source into direct current and outputting the direct current to the direct current bus. The second DC-DC module can be connected with the direct current bus through a second breaking device, and the second DC-DC module is used for carrying out voltage conversion on direct current output by the direct current power supply and outputting the direct current to the direct current bus. The first DC-DC module can be used for acquiring direct current from a direct current bus and outputting the direct current to a load after voltage conversion.
The application introduces the concept of the power supply branch circuits, and the charging system can transmit the electric energy provided by different power supply branch circuits to a load, or transmit the electric energy of one or a plurality of power supply branch circuits to another power supply branch circuit or another plurality of power supply branch circuits, so that the applicability is strong. Meanwhile, each power supply branch can be connected with a direct current bus, and power is supplied to a load (or a circuit or electric equipment at a load end) through the direct current bus, so that the system can conveniently add a new power supply branch or remove an original power supply branch while the stability of the system is improved, the application range and the application scene of the system are also increased, and the charging system can adapt to more diversified loads and supply power for the loads. In addition, the charging system is provided with breaking devices (for example, a first breaking device and a second breaking device) in each power supply branch circuit so as to provide reliable insulation in the system, improve the safety of the system, and have a simple structure, so that the layout cost of the system can be reduced.
It can be understood that each breaking device in the application can also control whether the corresponding power supply branch circuit is connected to the system to supply power to the load (or other power supply branch circuits) or not according to the running state of the system or the load condition of the load, or whether the corresponding power supply branch circuit is connected to the system to receive the power from other power supply branch circuits. Correspondingly, the breaking device can also control whether the corresponding power supply branch is disconnected from the system according to the running state of the system so as to overhaul or maintain the system. The breaking means here may comprise a circuit or a device of a circuit breaker, a contactor or the like having a function of shutting off a circuit connection inside the power supply branch.
With reference to the first aspect, in a first possible implementation manner, the charging system may further include a first leakage current detection circuit, and the first leakage current detection circuit may be connected to a circuit between the second DC-DC module and the second breaking device. The first leakage current detection circuit is used for detecting the ground current of the circuit branch where the second DC-DC module and the second breaking device are located. The second breaking device is used for breaking the circuit connection between the second DC-DC module and the direct current bus when the ground current of the circuit branch where the second DC-DC module and the second breaking device are located is larger than or equal to the first target current value.
Here, the second DC-DC module does not include an isolation device, and is a non-isolated DC-DC module. Meanwhile, the AC-DC module does not comprise an isolation device and is a non-isolated AC-DC module. It will be appreciated that the leakage current detection circuit is connected to the power supply branch where the non-isolated DC-DC module is located, and the AC-DC modules in the other power supply branches (e.g., the AC current source and the AC power supply branch where the AC-DC module is located) are non-isolated AC-DC modules, and the leakage current detection circuit can determine the state of the power supply branch where the leakage current detection circuit is located (or the insulation of other parts (e.g., the AC power supply branch) from ground by detecting the difference of the currents flowing in and flowing out at the access point where the leakage current detection circuit accesses the power supply branch. When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection of the power supply branch (for example, between the second DC-DC module and the second breaking device) can be cut off through the breaking device, or the circuit connection between the power supply branch (for example, the direct current power supply branch comprising the direct current power supply and the second DC-DC module) and the direct current bus or the load branch can be cut off through the breaking device, so that the safe operation of the system is maintained, the safety of the system is improved, and the control method is simple and convenient.
With reference to the first aspect, in a second possible implementation manner, the second DC-DC module includes an isolation device, and the charging system may further include a first insulation detection circuit connected to a circuit between the direct current power supply and the second DC-DC module. The first insulation detection circuit is used for detecting the ground resistance of the circuit branch where the direct current power supply and the second DC-DC module are located. The second breaking device is used for breaking the circuit connection between the second DC-DC module and the DC bus when the ground resistance of the circuit branch where the DC power supply and the second DC-DC module are located is smaller than or equal to the first resistance value.
Here, the second DC-DC module includes an isolation device such as a transformer, an optocoupler, or a capacitor, and is an isolated DC-DC module. Meanwhile, the AC-DC module does not comprise an isolation device and is a non-isolated AC-DC module. The insulation detection circuit is connected to a circuit between the isolation DC-DC module and the direct current power supply, and the DC-DC module in the branch where the insulation detection circuit is located is the isolation DC-DC module, so that the interference of other power supply branches to the insulation detection circuit can be isolated, and the insulation detection circuit can detect the state of insulation of the power supply branch where the insulation detection circuit is located to the ground (or insulation of other parts) in real time. When the power supply branch circuit is insulated from the ground (or insulated from other parts) and does not meet the safe operation condition, the circuit connection of the power supply branch circuit (for example, between a direct current power supply and a second DC-DC module) can be cut off through a breaking device, or the circuit connection of the power supply branch circuit (for example, the direct current power supply branch circuit comprising the direct current power supply and the second DC-DC module) and the direct current bus or the load branch circuit can be cut off through the breaking device, so that the safe operation of the system is maintained, the safety of the system is improved, and the control method is simple and convenient.
With reference to the first aspect, in a third possible implementation manner, the AC-DC module includes an isolation device, and the charging system may further include a first insulation detection circuit connected to a circuit between the direct current power supply and the second DC-DC module, or a first insulation detection circuit connected to a circuit between the second DC-DC module and the second breaking device. The first insulation detection circuit can be used for detecting the ground resistance of the circuit branch where the direct current power supply and the second DC-DC module are located. The second breaking device may be configured to break a circuit connection between the second DC-DC module and the DC bus when a ground resistance of a circuit branch in which the DC power supply and the second DC-DC module are located is less than or equal to the first resistance value.
Here, the AC-DC module includes an isolation device such as a transformer, an optocoupler, or a capacitor, which is an isolated AC-DC module. Meanwhile, the second DC-DC module does not comprise an isolation device and is a non-isolated DC-DC module. The insulation detection circuit is connected to the power supply branch where the non-isolated DC-DC module is located, interference of other power supply branches to the insulation detection circuit cannot be isolated in real time, and the insulation detection circuit can detect the state of insulation of the power supply branch where the insulation detection circuit is located to the ground (or insulation of other parts) when the breaking device in the branch where the insulation detection circuit is located is disconnected. When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection of the power supply branch (for example, between the second DC-DC module and the second breaking device) can be cut off through the breaking device, or the circuit connection between the power supply branch (for example, the direct current power supply branch comprising the direct current power supply and the second DC-DC module) and the direct current bus or the load branch can be cut off through the breaking device, so that the safe operation of the system is maintained, the safety of the system is improved, and the control method is simple and convenient.
With reference to the first aspect, in a fourth possible implementation manner, the AC-DC module and the second DC-DC module each include an isolation device, and the first insulation detection circuit is connected to a circuit between the direct current power supply and the second DC-DC module. The first insulation detection circuit can be used for detecting the ground resistance of the circuit branch where the direct current power supply and the second DC-DC module are located. The second breaking device may be configured to break a circuit connection between the second DC-DC module and the DC bus when a ground resistance of a circuit branch in which the DC power supply and the second DC-DC module are located is less than or equal to the first resistance value.
Here, the second DC-DC module includes an isolation device such as a transformer, an optocoupler, or a capacitor, and is an isolated DC-DC module. Meanwhile, the AC-DC module comprises a transformer, an optocoupler or a capacitor and other isolation devices, and is used for isolating the AC-DC module. The insulation detection circuit is connected to a circuit between the isolation DC-DC module and the direct current power supply, and the DC-DC module in the branch where the insulation detection circuit is located is the isolation DC-DC module, so that the interference of other power supply branches to the insulation detection circuit can be isolated, and the insulation detection circuit can detect the state of insulation of the power supply branch where the insulation detection circuit is located to the ground (or insulation of other parts) in real time. When the power supply branch circuit is insulated from the ground (or insulated from other parts) and does not meet the safe operation condition, the circuit connection of the power supply branch circuit (for example, between a direct current power supply and a second DC-DC module) can be cut off through a breaking device, or the circuit connection of the power supply branch circuit (for example, the direct current power supply branch circuit comprising the direct current power supply and the second DC-DC module) and the direct current bus or the load branch circuit can be cut off through the breaking device, so that the safe operation of the system is maintained, the safety of the system is improved, and the control method is simple and convenient.
In a second aspect, the present application provides a charging system that may include a charging stake including an AC-DC module, a first DC-DC module, and a direct current bus, a photovoltaic system including a second DC-DC module, an energy storage system including a third DC-DC module, and a plurality of breaking devices including a first breaking device, a second breaking device, and a third breaking device. Here, the AC-DC module is connected to the AC source through the first breaking device, and the AC-DC module may be used to convert AC power output from the AC source into DC power and output the DC power to the DC bus. The second DC-DC module is connected with the direct current bus through the second breaking device and can be used for carrying out voltage conversion on direct current output by the photovoltaic power supply and outputting the direct current to the direct current bus. The third DC-DC module is connected with the direct current bus through a third breaking device and can be used for carrying out voltage conversion on direct current output by the energy storage power supply and outputting the direct current to the direct current bus. The first DC-DC module can be used for acquiring direct current from a direct current bus and outputting the direct current to a load after voltage conversion.
It can be understood that each breaking device in the application can control whether the corresponding power supply branch circuit is connected to the system to supply power to the load (or other power supply branch circuits) or not according to the running state of the system or according to the load condition of the load, or whether the corresponding power supply branch circuit is connected to the system to receive the power from other power supply branch circuits. Correspondingly, the breaking device can also control whether the corresponding power supply branch is disconnected from the system according to the running state of the system so as to overhaul or maintain the system. The breaking means here may comprise a circuit or a device of a circuit breaker, a contactor or the like having a function of shutting off a circuit connection inside the power supply branch.
In the application, the charging system can transmit the electric energy provided by different power supply branches to the load, or transmit the electric energy of one or a plurality of power supply branches to another power supply branch or another plurality of power supply branches, so that the applicability is strong. Meanwhile, each power supply branch can be connected with a direct current bus, and power is supplied to a load (or a circuit or electric equipment at a load end) through the direct current bus, so that the system can conveniently add a new power supply branch or remove an original power supply branch while the stability of the system is improved, the application range and the application scene of the system are also increased, and the charging system can adapt to more diversified loads and supply power for the loads. In addition, the charging system is provided with breaking devices (such as a first breaking device, a second breaking device and a third breaking device) in each power supply branch, so that reliable insulation can be provided in the system, the safety of the system is improved, the structure is simple, and the layout cost of the system can be reduced.
With reference to the second aspect, in a first possible implementation manner, the charging system may further include a fourth breaking device and a fifth breaking device, wherein the fourth breaking device may be used to connect between the AC-DC module and the direct current bus, and the fifth breaking device may be used to connect between the first DC-DC module and the direct current bus.
In the application, the alternating current power supply branch and the load branch of the charging system can be uniformly distributed or separated, and correspondingly, a breaking device (such as a fourth breaking device and a fifth breaking device) can be included between the alternating current power supply branch and the load branch (such as an AC-DC module of the alternating current power supply branch and a first DC-DC module of the load branch), and the breaking device can cut off the circuit connection of the alternating current power supply branch or the load branch or cut off the circuit connection between the alternating current power supply branch and the load branch when the ground insulation (or insulation to other parts) of the circuit branch where the alternating current power supply branch or the load is located leads to larger leakage current of the power supply branch or smaller ground resistance of the other parts and the like, so as to maintain the safe operation of the system. Correspondingly, the fourth breaking device and the fifth breaking device in the application can also control whether the alternating current power supply branch or the load branch is disconnected from the system according to the running state of the system so as to overhaul or maintain the alternating current power supply branch or the load branch. The breaking device is various in layout scene, reliable insulation can be provided in the system, the safety of the system is improved, the structure is simple, and the layout cost of the system can be reduced.
With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner, the charging system may further include a second leakage current detection circuit and a third leakage current detection circuit. Here, the second leakage current detection circuit is connected to a circuit between the second DC-DC module and the second breaking device, and the third leakage current detection circuit is connected to a circuit between the third DC-DC module and the third breaking device. The second leakage current detection circuit can be used for the ground current of the circuit branch where the second DC-DC module and the second breaking device are located. The second breaking device may be configured to break the circuit connection between the second DC-DC module and the direct current bus when the ground current of the circuit branch in which the second DC-DC module and the second breaking device are located is greater than or equal to a second target current value. The third leakage current detection circuit can be used for the ground current of the circuit branch where the third DC-DC module and the third breaking device are located. The third breaking device may be configured to break a circuit connection between the third DC-DC module and the direct current bus when a ground current of a circuit branch in which the third DC-DC module and the third breaking device are located is greater than or equal to a third target current value.
Here, the second DC-DC module and the third DC-DC module do not include an isolation device, and are non-isolated DC-DC modules. Meanwhile, the AC-DC module does not comprise an isolation device and is a non-isolated AC-DC module. It will be appreciated that the leakage current detection circuit is connected to the power supply branch where the non-isolated DC-DC module is located, and the AC-DC modules in the other power supply branches (e.g., the AC current source and the AC power supply branch where the AC-DC module is located) are non-isolated AC-DC modules, and the leakage current detection circuit can determine the state of the power supply branch where the leakage current detection circuit is located (or the insulation of other parts (e.g., the AC power supply branch) from ground by detecting the difference of the currents flowing in and flowing out at the access point where the leakage current detection circuit accesses the power supply branch. When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the breaking device cuts off the circuit connection of the power supply branch (for example, between the second DC-DC module and the second breaking device or between the third DC-DC module and the third breaking device), or the breaking device cuts off the circuit connection between the power supply branch (for example, a photovoltaic power supply branch comprising a photovoltaic power supply and the second DC-DC module and the second breaking device or a pure energy storage power supply branch comprising an energy storage power supply and the third DC-DC module and the third breaking device) and the direct current bus or the load branch, so that the safe operation of the system is maintained, the safety of the system is improved, and the control method is simple and convenient.
With reference to the second aspect or the first possible implementation manner of the second aspect, in a third possible implementation manner, the second DC-DC module includes an isolation device, and the charging system may further include a second insulation detection circuit and a third leakage current detection circuit, where the second insulation detection circuit is connected to a circuit between the photovoltaic power source and the second DC-DC module, and the third leakage current detection circuit is connected to a circuit between the third DC-DC module and the third breaking device. The second insulation detection circuit can be used for detecting the ground resistance of the circuit branch where the photovoltaic power supply and the second DC-DC module are located. The second breaking device may be configured to break the circuit connection between the second DC-DC module and the DC bus when the ground resistance of the circuit branch in which the photovoltaic power supply and the second DC-DC module are located is less than or equal to the second resistance value. The third leakage current detection circuit can be used for detecting the ground current of the circuit branch where the third DC-DC module and the third breaking device are located. The third breaking device may be configured to break a circuit connection between the third DC-DC module and the direct current bus when a ground current of a circuit branch in which the third DC-DC module and the third breaking device are located is greater than or equal to a third target current value.
Here, the second DC-DC module includes an isolation device such as a transformer, an optocoupler, or a capacitor, and is an isolated DC-DC module. The third DC-DC module does not include an isolation device and is a non-isolated DC-DC module. Meanwhile, the AC-DC module does not comprise an isolation device and is a non-isolated AC-DC module. It will be appreciated that the leakage current detection circuit is connected to the power supply branch where the non-isolated DC-DC module is located, and the AC-DC modules in the other power supply branches (e.g., the AC current source and the AC power supply branch where the AC-DC module is located) are non-isolated AC-DC modules, and the leakage current detection circuit can determine the state of the power supply branch where the leakage current detection circuit is located (or the insulation of other parts (e.g., the AC power supply branch) from ground by detecting the difference of the currents flowing in and flowing out at the access point where the leakage current detection circuit accesses the power supply branch. When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection of the power supply branch (for example, between the third DC-DC module and the third breaking device) is cut off by the breaking device, or the circuit connection between the power supply branch (for example, a pure energy storage power supply branch comprising an energy storage power supply and the third DC-DC module and the third breaking device) and the direct current bus or the load branch is cut off by the breaking device, so that the safe operation of the system is maintained. Meanwhile, the insulation detection circuit is connected to a circuit between the isolation DC-DC module and the direct current power supply, and the DC-DC module in the branch where the insulation detection circuit is located is the isolation DC-DC module, so that the interference of other power supply branches to the insulation detection circuit can be isolated, and the insulation detection circuit can detect the state of insulation of the power supply branch where the insulation detection circuit is located to the ground (or insulation of other parts) in real time. When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the breaking device cuts off the circuit connection of the power supply branch (for example, between the photovoltaic power supply and the second DC-DC module), or cuts off the circuit connection between the power supply branch (for example, the photovoltaic power supply branch comprising the photovoltaic power supply and the second DC-DC module and the second breaking device) and the direct current bus or the load branch, so as to maintain the safe operation of the system, improve the safety of the system, and simplify the control method.
With reference to the second aspect or the first possible implementation manner of the second aspect, in a fourth possible implementation manner, the third DC-DC module includes an isolation device, and the charging system may further include a second leakage current detection circuit and a third insulation detection circuit, where the second leakage current detection circuit is connected to a circuit between the second DC-DC module and the second breaking device, and the third insulation detection circuit is connected to a circuit between the energy storage power supply and the third DC-DC module. The second leakage current detection circuit can be used for detecting the ground current of the circuit branch where the second DC-DC module and the second breaking device are located. The second breaking device may be configured to break the circuit connection between the third DC-DC module and the direct current bus when the ground current of the circuit branch in which the third DC-DC module and the third breaking device are located is greater than or equal to the second target current value. The third insulation detection circuit can be used for detecting the ground resistance of the circuit branch where the energy storage power supply and the third DC-DC module are located. The third breaking device can be used for breaking the circuit connection between the third DC-DC module and the direct current bus when the ground resistance of the circuit branch where the energy storage power supply and the third DC-DC module are located is smaller than or equal to a third resistance value.
Here, the third DC-DC module includes an isolation device such as a transformer, an optocoupler, or a capacitor, and is an isolated DC-DC module. The second DC-DC module does not include an isolation device and is a non-isolated DC-DC module. Meanwhile, the AC-DC module does not comprise an isolation device and is a non-isolated AC-DC module. It will be appreciated that the leakage current detection circuit is connected to the power supply branch where the non-isolated DC-DC module is located, and the AC-DC modules in the other power supply branches (e.g., the AC current source and the AC power supply branch where the AC-DC module is located) are non-isolated AC-DC modules, and the leakage current detection circuit can determine the state of the power supply branch where the leakage current detection circuit is located (or the insulation of other parts (e.g., the AC power supply branch) from ground by detecting the difference of the currents flowing in and flowing out at the access point where the leakage current detection circuit accesses the power supply branch. When the power supply branch is insulated from ground (or from other parts) and the safe operation condition is not met, the circuit connection between the power supply branch (for example, between the second DC-DC module and the second breaking device) and the direct current bus or the load branch is cut off by the breaking device, or the circuit connection between the power supply branch (for example, the photovoltaic power supply branch comprising the photovoltaic power supply and the second DC-DC module and the second breaking device) and the direct current bus or the load branch is cut off by the breaking device, so that the safe operation of the system is maintained. Meanwhile, the insulation detection circuit is connected to a circuit between the isolation DC-DC module and the direct current power supply, and the DC-DC module in the branch where the insulation detection circuit is located is the isolation DC-DC module, so that the interference of other power supply branches to the insulation detection circuit can be isolated, and the insulation detection circuit can detect the state of insulation of the power supply branch where the insulation detection circuit is located to the ground (or insulation of other parts) in real time. When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the breaking device cuts off the circuit connection of the power supply branch (for example, between the energy storage power supply and the third DC-DC module), or cuts off the circuit connection between the power supply branch (for example, a pure energy storage power supply branch comprising the energy storage power supply and the third DC-DC module and the third breaking device) and the direct current bus or the load branch, so as to maintain the safe operation of the system, improve the safety of the system, and simplify the control method.
With reference to the second aspect or the first possible implementation manner of the second aspect, in a fifth possible implementation manner, the second DC-DC module and the third DC-DC module each include an isolation device, and the charging system may further include a second insulation detection circuit and a third insulation detection circuit, where the second insulation detection circuit is connected to a circuit between the photovoltaic power source and the second DC-DC module, and the third insulation detection circuit is connected to a circuit between the energy storage power source and the third DC-DC module. The second insulation detection circuit can be used for detecting the ground resistance of the circuit branch where the photovoltaic power supply and the second DC-DC module are located. The second breaking device may be configured to break the electrical connection between the second DC-DC module and the DC bus when the ground resistance of the circuit branch in which the photovoltaic power supply and the second DC-DC module are located is less than or equal to a second target resistance value. The third insulation detection circuit can be used for detecting the ground resistance of the circuit branch where the energy storage power supply and the third DC-DC module are located. The third breaking device can be used for breaking the circuit connection between the third DC-DC module and the direct current bus when the ground resistance of the circuit branch where the energy storage power supply and the third DC-DC module are located is smaller than or equal to a third target resistance value.
Here, the second DC-DC module and the third DC-DC module may include an isolation device such as a transformer, an optocoupler, or a capacitor, for isolating the DC-DC modules. Meanwhile, the AC-DC module does not comprise an isolation device and is a non-isolated AC-DC module. It will be appreciated that the insulation detection circuit is connected to a circuit between the isolated DC-DC module and the DC power supply, and the DC-DC module in the branch where the insulation detection circuit is located is the isolated DC-DC module, which can isolate the interference of other power supply branches to the insulation detection circuit, so that the insulation detection circuit can detect the state of insulation of the power supply branch where the insulation detection circuit is located from ground (or insulation of other parts) in real time. When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection between the power supply branch (for example, between the photovoltaic power supply and the second DC-DC module or between the energy storage power supply and the third DC-DC module) and the direct current bus or the load branch can be cut off by the breaking device, or the circuit connection between the power supply branch (for example, the photovoltaic power supply branch comprising the photovoltaic power supply and the second DC-DC module and the second breaking device or the pure energy storage power supply branch comprising the energy storage power supply and the third DC-DC module and the third breaking device) and the direct current bus or the load branch can be cut off by the breaking device, so that the safe operation of the system is maintained, the safety of the system is improved, and the control method is simple.
With reference to the second aspect or the first possible implementation manner of the second aspect, in a sixth possible implementation manner, the AC-DC module and the second DC-DC module each include an isolation device, and the charging system may further include a second insulation detection circuit and a third insulation detection circuit, where the second insulation detection circuit is connected to a circuit between the photovoltaic power source and the second DC-DC module, and the third insulation detection circuit is connected to a circuit between the third DC-DC module and the third breaking device. The second insulation detection circuit can be used for detecting the ground resistance of the circuit branch where the photovoltaic power supply and the second DC-DC module are located. The second breaking device may be configured to break the circuit connection between the second DC-DC module and the direct current bus when the ground resistance of the circuit branch in which the second DC-DC module and the second breaking device are located is less than or equal to a second target resistance value. The third insulation detection circuit can be used for detecting the ground resistance of the circuit branch where the third DC-DC module and the third breaking device are located. The third breaking device may be configured to break a circuit connection between the third DC-DC module and the direct current bus when a ground resistance of a circuit branch in which the third DC-DC module and the third breaking device are located is less than or equal to a third target resistance value.
Here, the second DC-DC module includes an isolation device such as a transformer, an optocoupler, or a capacitor, and is an isolated DC-DC module. The third DC-DC module does not include an isolation device and is a non-isolated DC-DC module. Meanwhile, the AC-DC module comprises a transformer, an optocoupler or a capacitor and other isolation devices, and is used for isolating the AC-DC module. It will be appreciated that the second insulation detection circuit is connected to the circuit between the isolated DC-DC module and the DC power supply, and the DC-DC module in the branch where the second insulation detection circuit is located is the isolated DC-DC module, which can isolate the interference of other power supply branches to the insulation detection circuit, so that the second insulation detection circuit can detect the state of insulation of the power supply branch where the second insulation detection circuit is located from ground (or insulation of other parts) in real time. When the power supply branch is insulated from the ground (or insulated from other parts) and does not meet the safe operation condition, the circuit connection between the power supply branch (for example, between a photovoltaic power supply and the second DC-DC module) or the circuit connection between the power supply branch (for example, the photovoltaic power supply branch comprising the photovoltaic power supply and the second DC-DC module and the second breaking device) and the direct current bus or the load branch can be cut off by the breaking device, so that the safe operation of the system is maintained, the safety of the system is improved, and the control method is simple and convenient. Meanwhile, it can be understood that the third insulation detection circuit is connected to the power supply branch where the non-isolated DC-DC module is located, so that the interference of other power supply branches to the insulation detection circuit cannot be isolated in real time, and the third insulation detection circuit can detect the state of insulation of the power supply branch where the third insulation detection circuit is located to the ground (or insulation of other parts) when the breaking device in the branch where the third insulation detection circuit is located is disconnected. When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection between the power supply branch (for example, between the third DC-DC module and the third breaking device) or the circuit connection between the power supply branch (for example, a pure energy storage power supply branch comprising an energy storage power supply and the third DC-DC module and the third breaking device) and the direct current bus or the load branch can be cut off by the breaking device, so that the safe operation of the system is maintained, the safety of the system is improved, and the control method is simple and convenient.
With reference to the second aspect or the first possible implementation manner of the second aspect, in a seventh possible implementation manner, the AC-DC module and the third DC-DC module each include an isolation device, and the charging system may further include a second insulation detection circuit and a third insulation detection circuit, where the second insulation detection circuit is connected to a circuit between the second DC-DC module and the second breaking device, and the third insulation detection circuit is connected to a circuit between the energy storage device and the third DC-DC module. The second insulation detection circuit may be configured to detect a ground resistance of a circuit branch in which the second DC-DC module and the second breaking device are located. The second breaking device may be configured to break the circuit connection between the second DC-DC module and the direct current bus when the ground resistance of the circuit branch in which the second DC-DC module and the second breaking device are located is less than or equal to a second target resistance value. The third insulation detection circuit may be configured to detect a ground resistance of a circuit branch in which the energy storage device and the third DC-DC module are located. The third breaking device may be configured to break a circuit connection between the third DC-DC module and the direct current bus when a ground resistance of a circuit branch in which the energy storage device and the third DC-DC module are located is less than or equal to a third target resistance value.
Here, the third DC-DC module includes an isolation device such as a transformer, an optocoupler, or a capacitor, and is an isolated DC-DC module. The second DC-DC module does not include an isolation device and is a non-isolated DC-DC module. Meanwhile, the AC-DC module comprises a transformer, an optocoupler or a capacitor and other isolation devices, and is used for isolating the AC-DC module. It will be appreciated that the second insulation detection circuit is connected to the power supply branch where the non-isolated DC-DC module is located, and cannot isolate the interference of other power supply branches to the insulation detection circuit in real time, and the second insulation detection circuit can detect the state that the power supply branch where the second insulation detection circuit is located is insulated from the ground (or insulated from other parts) when the breaking device in the branch where the second insulation detection circuit is located is disconnected. When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection between the power supply branch (for example, between the second DC-DC module and the second breaking device) and the direct current bus or the load branch can be cut off by the breaking device, or the circuit connection between the power supply branch (for example, the photovoltaic power supply branch comprising the photovoltaic power supply and the second DC-DC module and the second breaking device) and the direct current bus or the load branch can be cut off by the breaking device, so that the safe operation of the system can be maintained, the safety of the system can be improved, and the control method is simple and convenient. Meanwhile, it can be understood that the third insulation detection circuit is connected to a circuit between the isolation DC-DC module and the direct current power supply, and the DC-DC module in the branch where the third insulation detection circuit is located is the isolation DC-DC module, so that the interference of other power supply branches to the insulation detection circuit can be isolated, and the insulation detection circuit can detect the state of insulation of the power supply branch where the third insulation detection circuit is located from the ground (or insulation of other parts) in real time. When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection between the power supply branch (for example, between the photovoltaic power supply and the second DC-DC module or between the energy storage power supply and the third DC-DC module) and the direct current bus or the load branch can be cut off by the breaking device, or the circuit connection between the power supply branch (for example, the photovoltaic power supply branch comprising the photovoltaic power supply and the second DC-DC module and the second breaking device or the pure energy storage power supply branch comprising the energy storage power supply and the third DC-DC module and the third breaking device) and the direct current bus or the load branch can be cut off by the breaking device, so that the safe operation of the system is maintained, the safety of the system is improved, and the control method is simple.
With reference to the second aspect or the first possible implementation manner of the second aspect, in an eighth possible implementation manner, the AC-DC module, the second DC-DC module, and the third DC-DC module each include an isolation device, and the charging system may further include a second insulation detection circuit and a third insulation detection circuit, where the second insulation detection circuit is connected to a circuit between the photovoltaic power source and the second DC-DC module, and the third insulation detection circuit is connected to a circuit between the energy storage device and the third DC-DC module. The second insulation detection circuit can be used for detecting the ground resistance of the circuit branch where the photovoltaic power supply and the second DC-DC module are located. The second breaking device may be configured to break a circuit connection between the second DC-DC module and the direct current bus when a ground resistance of a circuit branch in which the photovoltaic power supply and the second DC-DC module are located is less than or equal to a second target resistance value. The third insulation detection circuit may be configured to detect a ground resistance of a circuit branch in which the energy storage device and the third DC-DC module are located. The third breaking device may be configured to break a circuit connection between the third DC-DC module and the direct current bus when a ground resistance of a circuit branch in which the energy storage device and the third DC-DC module are located is less than or equal to a third target resistance value.
Here, the second DC-DC module and the third DC-DC module may include an isolation device such as a transformer, an optocoupler, or a capacitor, for isolating the DC-DC modules. Meanwhile, the AC-DC module comprises a transformer, an optocoupler or a capacitor and other isolation devices, and is used for isolating the AC-DC module.
It will be appreciated that the insulation detection circuit is connected to a circuit between the isolated DC-DC module and the DC power supply, and the DC-DC module in the branch where the insulation detection circuit is located is the isolated DC-DC module, which can isolate the interference of other power supply branches to the insulation detection circuit, so that the insulation detection circuit can detect the state of insulation of the power supply branch where the insulation detection circuit is located from ground (or insulation of other parts) in real time. When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection between the power supply branch (for example, between the photovoltaic power supply and the second DC-DC module or between the energy storage power supply and the third DC-DC module) and the direct current bus or the load branch can be cut off by the breaking device, or the circuit connection between the power supply branch (for example, the photovoltaic power supply branch comprising the photovoltaic power supply and the second DC-DC module and the second breaking device or the pure energy storage power supply branch comprising the energy storage power supply and the third DC-DC module and the third breaking device) and the direct current bus or the load branch can be cut off by the breaking device, so that the safe operation of the system is maintained, the safety of the system is improved, and the control method is simple.
Drawings
Fig. 1 is a schematic diagram of an application scenario of a charging system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a charging system according to an embodiment of the present application;
fig. 3 is another schematic structural diagram of a charging system according to an embodiment of the present application;
fig. 4 is another schematic structural diagram of a charging system according to an embodiment of the present application;
fig. 5 is another schematic structural diagram of a charging system according to an embodiment of the present application;
fig. 6 is a schematic diagram of another application scenario of the charging system according to the embodiment of the present application;
fig. 7 is another schematic structural diagram of a charging system according to an embodiment of the present application;
fig. 8 is another schematic structural diagram of a charging system according to an embodiment of the present application;
fig. 9 is another schematic structural diagram of a charging system according to an embodiment of the present application;
fig. 10 is another schematic structural diagram of a charging system according to an embodiment of the present application;
fig. 11 is another schematic structural diagram of a charging system according to an embodiment of the present application;
fig. 12 is another schematic structural diagram of a charging system according to an embodiment of the present application;
fig. 13 is another schematic structural diagram of a charging system according to an embodiment of the present application;
fig. 14 is another schematic structural diagram of a charging system according to an embodiment of the present application;
Fig. 15 is another schematic structural diagram of a charging system according to an embodiment of the present application.
Detailed Description
The charging system provided by the application can be suitable for various application fields such as new energy power generation field, traditional power generation peak regulation and frequency modulation field, important equipment power supply field and the like, and can be specifically determined according to actual application scenes without limitation. The charging system provided by the application can be suitable for different scenes such as large power supply stations, industrial and commercial power supply, household power supply and the like, and is not limited herein. An application scenario of supplying power to a load in a power supply environment where an ac source and a dc source supply power together will be described below, and will not be described in detail.
Referring to fig. 1, fig. 1 is a schematic diagram of an application scenario of a charging system according to an embodiment of the application. In a photovoltaic charging system, as shown in fig. 1, the charging system may include an AC-DC module 101, a plurality of DC-DC modules (e.g., a first DC-DC module 103, a second DC-DC module 201), and a plurality of breaking devices (e.g., a first breaking device 102 and a second breaking device 202). Here, the AC-DC module 101 may be connected to the AC source 10 through the first breaking device 102, and the AC-DC module 101 may be used to convert the AC power output from the AC source 10 into DC power and output the DC power to the DC bus. Here, the second DC-DC module 201 may be connected to the DC bus through the second breaking device 202, and the second DC-DC module 201 may be configured to perform voltage conversion on the DC power output from the DC power supply and output the DC power to the DC bus. Here, the dc power source may include a photovoltaic power source 20, an energy storage power source 30. The first DC-DC module 103 may be configured to obtain direct current from the DC bus, convert the voltage, and output the converted voltage to the load 40. Here, the breaking means is a functional circuit having a connection between circuits connected at both ends thereof.
In some possible embodiments, the charging system may be applied to an application scenario of power supply by multiple energy sources, where the multiple energy sources refer to the charging system may provide electric energy from multiple power sources (e.g., ac source 10, dc power source (e.g., photovoltaic power source 20, energy storage power source 30), etc.) or other energy sources to load 40 (e.g., a charging pile of an electric vehicle). That is, the charging system herein may include at least two power supply branches (for example, an ac power supply branch connected to the ac source 10, a dc power supply branch connected to the dc power source (for example, a photovoltaic power supply branch, or a pure energy storage power supply branch), and the like), and transmit the electric energy of these power supply branches to the load 40 or a circuit of the load end or electric equipment of the load end, so as to adapt to the application scenario diversity of the charging system, and meet the increasing power supply requirement of the load end.
It can be appreciated that the charging system provided by the application is suitable for an application scenario of supplying power to charging piles in a parking lot or other areas, or supplying power to base station equipment in remote areas without commercial power or poor commercial power, or supplying power to household equipment (such as a refrigerator, an air conditioner and the like) and the like to supply power to various electric equipment, and the charging system can be specifically determined according to actual application scenarios without limitation. It is further understood that the load 40 in fig. 1 may include a charging pile, a transmission line, a power transfer site, a communication base station, or a consumer or power transmission device such as a household appliance.
In some application scenarios, the charging system may also transmit the electric energy of one (or several) power sources (e.g., the ac power source 10, the dc power source (e.g., the photovoltaic power source 20, the energy storage power source 30), etc.) or other energy sources to other power supply branch(s) (e.g., the ac power supply branch connected to the ac power source 10, the dc power supply branch connected to the dc power source (e.g., the photovoltaic power supply branch, or the pure energy storage power supply branch), etc.). For example, the charging system may transfer electrical energy generated by the photovoltaic power source 20 to an ac power branch or the like. It will be appreciated that the charging system herein includes a variety of power supply branches, may be adapted for a variety of applications, and may be adapted to power a large scale load 40 (e.g., a large number of charging posts). Here, charging system can connect multiple power supply branch road in direct current generating line to through direct current generating line with electric energy transmission to the load end, unified the relation of connection of system, promoted the stability of system, and be convenient for lay, reduced the design cost of system. The charging system and the operation principle thereof provided by the present application will be exemplified with reference to fig. 2 to 15.
The load end may include a load 40, or a power circuit, or a consumer, or a load branch composed of the power circuit and the load 40 (for example, a load branch composed of the first DC-DC module 103 and the load 40), or the like. In addition, each power supply branch of the charging system in the present application may include a breaking device (for example, the first breaking device 102 and the second breaking device 202), where the breaking device may cut off the circuit connection of the power supply branch when the insulation of a certain power supply branch to the ground (or the insulation of other parts) in the system does not meet the safe operation condition, or the breaking device cuts off the circuit connection between the power supply branch and the load 40 (or the other power supply branches) so as to maintain the safe operation of the system. It will be understood that, where insulation of a certain power supply branch from ground (or insulation of other parts) does not meet the safe operating condition, this may refer to a situation where a certain power supply branch is shorted to ground (or to other parts), or there is a leakage current between the power supply branch and ground (or between the power supply branch and other parts), or the impedance to ground (or to other parts) is less than a preset value, and so on, which does not meet the safe operating condition of the system. It is further understood that each breaking device in the present application may also control whether the corresponding power supply branch is connected to the system to supply power to the load 40 (or other power supply branches) or whether the corresponding power supply branch is connected to the system to receive power from other power supply branches according to the operation state of the system or according to the load condition of the load 40. Correspondingly, the breaking device can also control whether the corresponding power supply branch is disconnected from the system according to the running state of the system so as to overhaul or maintain the system. The breaking means here may comprise a circuit or a device of a circuit breaker, a contactor or the like having a function of shutting off a circuit connection inside the power supply branch.
The concept of the power supply branch circuits is introduced in the application, and the charging system can transmit the electric energy provided by different power supply branch circuits to the load 40, or transmit the electric energy of one or a plurality of power supply branch circuits to another power supply branch circuit or another plurality of power supply branch circuits, so that the applicability is strong. Meanwhile, each power supply branch circuit can be connected with a direct current bus and supplies power to the load 40 (or a circuit or electric equipment at a load end) through the direct current bus, so that the system can conveniently add a new power supply branch circuit or remove an original power supply branch circuit while the stability of the system is improved, the application range and the application scene of the system are also increased, and the charging system can adapt to more diversified loads 40 and supply power for the loads. In addition, the charging system is provided with breaking devices (for example, the first breaking device 102 and the second breaking device 202) in each power supply branch, so that reliable insulation is provided in the system, the safety of the system is improved, the structure is simple, and the layout cost of the system can be reduced.
In some possible embodiments, the AC-DC module in the charging system may be an isolated AC-DC module or a non-isolated AC-DC module, and the DC-DC module in the charging system may be an isolated DC-DC module or a non-isolated DC-DC module. Here, the isolated AC-DC module and the isolated DC-DC module may be AC-DC modules and DC-DC modules whose both ends are connected to circuits with electrical isolation. That is, the isolation circuit herein may refer to a circuit in which a circuit connected to both ends thereof is electrically isolated, for example, a circuit employing an isolation device (for example, a transformer, an optocoupler, or a capacitor). Accordingly, the non-isolated AC-DC module and the non-isolated DC-DC module are not electrically isolated AC-DC modules and DC-DC modules for circuits connected at both ends thereof. That is, a non-isolated circuit herein may refer to a circuit in which electrical isolation is not present in a circuit connected across it, for example, a circuit in which an isolation device is not employed. Here, the optional specific power circuit forms of AC-DC module and DC-DC module are various, can be suitable for different application scenario, can promote the security of system simultaneously, and simple structure improves the adaptability of system.
In some possible embodiments, the isolated AC-DC module and the isolated DC-DC module may include a basic insulation structure or a reinforced insulation structure. Here, the basic insulating structure may be a structure in which a circuit in which it is located is insulated by an insulating material or an air gap, and the reinforcing insulating structure may be a structure in which a circuit in which it is located is insulated by an insulating material or an air gap on the basis of the basic insulating structure. That is, the reinforced insulation structure may further employ a basic insulation structure (or other insulation means) to provide further insulation for the circuit, based on the basic insulation structure. Here, the specific form of further insulation may be the same as or different from the basic insulation. For example, if the basic insulation structure in the reinforced insulation structure is insulated by an insulation material, the further insulation structure in the reinforced insulation structure can be insulated by the insulation material, and also can be insulated by an air gap, and the reinforced insulation structure is particularly determined based on application scenes, and has the advantages of simple layout, high safety and strong applicability.
In some possible embodiments, please refer to fig. 2, fig. 2 is a schematic diagram of a charging system according to an embodiment of the present application. As shown in fig. 2, the charging system may include two DC-DC modules, a first DC-DC module 103 and a second DC-DC module 201, the AC-DC module 101 may not include an isolation device that is a non-isolated AC-DC module, the first DC-DC module 103 may include an isolation device that is an isolated DC-DC module, the second DC-DC module 201 may not include an isolation device that is a non-isolated DC-DC module, and the charging system may further include a first leakage current detection circuit (i.e., RCD in fig. 2) connected to a circuit between the second DC-DC module 201 and the second breaking device 202. The first leakage current detection circuit may be configured to break a circuit connection between the second DC-DC module 201 and the second breaking device 202 when a ground current of a circuit branch in which the second DC-DC module 201 and the second breaking device 202 are located is greater than or equal to a first target current value.
It will be appreciated that the AC-DC module 101 herein may be a non-isolated AC-DC module, the first DC-DC module 103 may be an isolated DC-DC module, and the second DC-DC module 201 may be a non-isolated DC-DC module. It is proposed herein that a certain circuit is an isolated AC-DC module or an isolated DC-DC module, meaning that isolation devices are employed inside the circuit. That is, the circuit itself is insulated from ground (or other circuitry) (or, alternatively, the impedance is greater than a predetermined value). The isolation circuit (e.g., the first DC-DC module 103) may be a normal isolation circuit or a reinforced isolation circuit. The common isolation circuit can be a circuit with isolation devices inside, is concise and has low layout cost. The reinforced isolation circuit can be a circuit which is added with other isolation measures (such as adding an insulating shell and the like) on the basis of adopting an isolation device, and has high safety. It is proposed herein that a certain circuit is a non-isolated AC-DC module or a non-isolated DC-DC module, meaning that a non-isolated device is employed inside the circuit, i.e. the circuit itself is non-isolated (or, in other words, has an impedance less than a preset value) with respect to ground (or other circuit). The first leakage current detection circuit is connected to the power supply branch where the non-isolated DC-DC module is located, and the AC-DC module 101 in the other power supply branches (for example, the AC power supply branch where the AC source 10 and the AC-DC module 101 are located) is a non-isolated AC-DC module, and the first leakage current detection circuit can determine the state of insulation of the power supply branch where the first leakage current detection circuit is located from ground (or insulation of other parts (for example, the AC power supply branch) by detecting the current difference between the current flowing in and flowing out of the access point where the leakage current detection circuit is accessed to the power supply branch, which will not be repeated herein. The leakage current detection circuit (for example, the first leakage current detection circuit) herein may be used to detect a current difference value flowing in and flowing out of an access point of the leakage current detection circuit at which the leakage current detection circuit accesses the power supply branch (for example, a direct current power supply branch including the direct current power supply and the second DC-DC module 201 and the second breaking device 202) corresponding to the leakage current detection circuit, so as to determine a state of insulation of the power supply branch from ground (or insulation of other parts). For example, the leakage current detection circuit may detect the current flowing into the leakage current detection circuit and the current flowing out of the leakage current detection circuit in the power supply branch to be detected (for example, the circuit branch where the second DC-DC module 201 is located), and use the difference value of the two currents as the leakage current of the power supply branch to be detected, so as to determine the insulation state to ground of the power supply branch. When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection of the power supply branch (for example, between the second DC-DC module 201 and the second breaking device 202) is cut off by the breaking device, or the circuit connection between the power supply branch (for example, the direct current power supply branch including the direct current power source and the second DC-DC module 201) and the direct current bus or the load branch is cut off by the breaking device, so as to maintain the safe operation of the system. Here, the leakage current detection circuit may detect a difference between currents flowing in and flowing out of an access point of the leakage current detection circuit to the power supply branch in the power supply branch where the leakage current detection circuit is located, and determine that the ground insulation (or insulation to other parts) of the power supply branch does not satisfy the safe operation condition when the difference between currents flowing in and flowing out of the leakage current detection circuit to the access point of the power supply branch is greater than or equal to a target value (for example, a first target current value). That is, the leakage current detection circuit can detect the current difference value of the current flowing in and out of the access point of the power supply branch where the leakage current detection circuit of the power supply branch is located, determine whether the insulation state of the power supply branch meets the safe operation condition, and when the power supply branch does not meet the safe operation condition, disconnect the circuit connection between the power supply branch and the load branch by indicating (or directly disconnecting or otherwise) to maintain the safe operation of the system, improve the safety of the system, and the control method is simple and convenient.
In some possible embodiments, please refer to fig. 3, fig. 3 is another schematic structural diagram of a charging system according to an embodiment of the present application. As shown in fig. 3, the charging system may include two DC-DC modules, a first DC-DC module 103 and a second DC-DC module 201, the AC-DC module 101 may not include an isolation device as a non-isolated AC-DC module, the first DC-DC module 103 and the second DC-DC module 201 may include an isolation device as an isolated DC-DC module, and the charging system may further include a first insulation detection circuit (i.e., an imd in fig. 3) connected to a circuit between the DC power supply and the second DC-DC module 201. The first insulation detection circuit may be configured to break a circuit connection between the DC power source and the second DC-DC module 201 when a ground resistance of a circuit branch in which the DC power source and the second DC-DC module 201 are located is less than or equal to a first target resistance value.
It is understood that the AC-DC module 101 herein may be a non-isolated AC-DC module, and the first DC-DC module 103 and the second DC-DC module 201 may be isolated DC-DC modules. It is proposed herein that a certain circuit is an isolated AC-DC module or an isolated DC-DC module, meaning that isolation devices are employed inside the circuit. That is, the circuit itself is insulated from ground (or other circuitry) (or, alternatively, the impedance is greater than a predetermined value). It is proposed herein that a certain circuit is a non-isolated AC-DC module or a non-isolated DC-DC module, meaning that a non-isolated device is employed inside the circuit, i.e. the circuit itself is non-isolated (or, in other words, has an impedance less than a preset value) with respect to ground (or other circuit). The first insulation detection circuit may be connected to a circuit between the isolated second DC-DC module 201 and the DC power supply, and the second DC-DC module 201 in the branch where the first insulation detection circuit is located is an isolated DC-DC module, which can isolate the interference of other power supply branches to the insulation detection circuit, so that the insulation detection circuit can detect the state of insulation of the power supply branch where the first insulation detection circuit is located from ground (or insulation of other parts), and the insulation detection circuit connected between the power supply (such as the photovoltaic power supply 20 and the energy storage power supply 30) and the isolated DC-DC module in the present application can achieve the above functions, which will not be described herein. The insulation detection circuit (for example, a first insulation detection circuit) herein may be used to detect a resistance value of a specific portion of a power supply branch (for example, a direct current power supply branch including the direct current power supply and the second DC-DC module 201 and the second breaking device 202) corresponding to the insulation detection circuit, so as to determine a state of insulation of the power supply branch from ground (or insulation of other portions). For example, the insulation detection circuit may respectively connect resistors with different resistances connected to the circuit thereof between a power supply branch to be detected (for example, the power supply branch where the second DC-DC module 201 is located) and the ground, so as to form different detection loops, obtain the equivalent impedance of the power supply branch to be detected with respect to the ground based on different voltages obtained by connecting resistors in different detection loops, and further determine the insulation state of the power supply branch to the ground. When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection of the power supply branch (for example, between the direct current power source and the second DC-DC module 201) is cut off by the breaking means, or the circuit connection between the power supply branch (for example, the direct current power supply branch including the direct current power source and the second DC-DC module 201) and the direct current bus or the load branch is cut off by the breaking means, so as to maintain the safe operation of the system. It will be further understood that when detecting the ground resistance of a certain power supply branch, the insulation detection circuit herein needs the DC-DC module (e.g., the second DC-DC module 201) in the power supply branch to be an isolated DC-DC module, or needs the AC-DC module (e.g., the AC-DC module 101) in the AC power supply branch connected to the same DC bus as the power supply branch to be an isolated AC-DC module, so that the voltage on the power supply branch detected by the insulation detection circuit is in a stable state and is not interfered by other power supply branches, which will not be repeated hereinafter. Here, the insulation detection circuit may detect a resistance value of a specific portion in the power supply branch where it is located, and determine that the ground insulation (or insulation to other portions) of the power supply branch does not satisfy the safe operation condition when the resistance value of the specific portion is less than or equal to a target value (for example, a first target resistance value). Here, the resistance value of the specific portion may be the ground resistance of the circuit branch in which the power supply (for example, direct current power supply) and the power circuit (for example, the second DC-DC module 201) are located in the power supply branch in which the insulation detection circuit is located, or the resistance of the power supply (for example, direct current power supply) or the power circuit (for example, the second DC-DC module 201) to ground in the power supply branch in which the insulation detection circuit is located. That is, the insulation detection circuit may detect the resistance value of a specific portion of the power supply branch where the insulation detection circuit is located, determine whether the insulation state of the power supply branch meets the safe operation condition, and when the power supply branch does not meet the safe operation condition, disconnect the circuit connection between the power supply branch and the load branch by indicating (or directly disconnecting or otherwise) the power supply branch so as to maintain the safe operation of the system, improve the safety of the system, and simplify the control method.
In some possible embodiments, please refer to fig. 4, fig. 4 is another schematic structural diagram of a charging system according to an embodiment of the present application. As shown in fig. 4, the charging system may include two DC-DC modules, a first DC-DC module 103 and a second DC-DC module 201, the AC-DC module 101 includes an isolation device that is an isolated AC-DC module, the first DC-DC module 103 includes an isolation device that is an isolated DC-DC module, the second DC-DC module 201 does not include an isolation device that is a non-isolated DC-DC module, and the charging system may further include a first insulation detection circuit (i.e., an imd in fig. 4) connected to a circuit between the second DC-DC module 201 and the second breaking device 202. The first insulation detection circuit may be configured to break a circuit connection between the second DC-DC module 201 and the second breaking device 202 when a ground resistance of a circuit branch in which the second DC-DC module 201 and the second breaking device 202 are located is less than or equal to a first target resistance value.
It will be appreciated that the AC-DC module 101 herein may be an isolated AC-DC module, the first DC-DC module 103 may be an isolated DC-DC module, and the second DC-DC module 201 may be a non-isolated DC-DC module. It is proposed herein that a certain circuit is an isolated AC-DC module or an isolated DC-DC module, meaning that isolation devices are employed inside the circuit. That is, the circuit itself is insulated from ground (or other circuitry) (or, alternatively, the impedance is greater than a predetermined value). The isolation circuit (e.g., the first DC-DC module 103) may be a normal isolation circuit or a reinforced isolation circuit. The common isolation circuit can be a circuit with isolation devices inside, is concise and has low layout cost. The reinforced isolation circuit can be a circuit which is added with other isolation measures (such as adding an insulating shell and the like) on the basis of adopting an isolation device, and has high safety. It is proposed herein that a certain circuit is a non-isolated AC-DC module or a non-isolated DC-DC module, meaning that a non-isolated device is employed inside the circuit, i.e. the circuit itself is non-isolated (or, in other words, has an impedance less than a preset value) with respect to ground (or other circuit). The first insulation detection circuit is connected to the power supply branch where the non-isolated DC-DC module is located, so that interference of other power supply branches to the insulation detection circuit cannot be isolated in real time, and the first insulation detection circuit can detect the state of insulation (or insulation to other parts) of the power supply branch where the first insulation detection circuit is located when the second breaking device in the branch where the first insulation detection circuit is located is disconnected. The insulation detection circuit (for example, a first insulation detection circuit) herein may be used to detect a resistance value of a specific portion of a power supply branch (for example, a direct current power supply branch including the direct current power supply and the second DC-DC module 201 and the second breaking device 202) corresponding to the insulation detection circuit, so as to determine a state of insulation of the power supply branch from ground (or insulation of other portions). When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection of the power supply branch (for example, between the second DC-DC module 201 and the second breaking device 202) is cut off by the breaking device, or the circuit connection between the power supply branch (for example, the direct current power supply branch including the direct current power source and the second DC-DC module 201) and the direct current bus or the load branch is cut off by the breaking device, so as to maintain the safe operation of the system. Here, the insulation detection circuit may detect a resistance value of a specific portion in the power supply branch where it is located, and determine that the ground insulation (or insulation to other portions) of the power supply branch does not satisfy the safe operation condition when the resistance value of the specific portion is less than or equal to a target value (for example, a first target resistance value). Here, the resistance value of the specific portion may be the ground resistance of the circuit branch in which the power circuit (for example, the second DC-DC module 201) and the load branch (for example, the first DC-DC module 103 in the load branch) are located in the power supply branch in which the insulation detection circuit is located, or the ground resistance of the power circuit (for example, the second DC-DC module 201) in the power supply branch in which the insulation detection circuit is located. That is, the insulation detection circuit may detect the resistance value of a specific portion of the power supply branch where the insulation detection circuit is located, determine whether the insulation state of the power supply branch meets the safe operation condition, and when the power supply branch does not meet the safe operation condition, disconnect the circuit connection between the power supply branch and the load branch by indicating (or directly disconnecting or otherwise) the power supply branch so as to maintain the safe operation of the system, improve the safety of the system, and simplify the control method.
Referring to fig. 5 in combination, fig. 5 is another schematic structural diagram of a charging system according to an embodiment of the application. As shown in fig. 5, the charging system may include two DC-DC modules, namely, a first DC-DC module 103 and a second DC-DC module 201, the AC-DC module 101 includes an isolation device that is an isolated AC-DC module, the first DC-DC module 103 and the second DC-DC module 201 include an isolation device that is an isolated DC-DC module, and the charging system may further include a first insulation detection circuit (i.e., an imd in fig. 5) connected to a circuit between the DC power supply and the second DC-DC module 201. The first insulation detection circuit may be configured to break a circuit connection between the DC power source and the second DC-DC module 201 when a ground resistance of a circuit branch in which the DC power source and the second DC-DC module 201 are located is less than or equal to a first target resistance value.
It is understood that the AC-DC module 101 herein may be an isolated AC-DC module, and the first DC-DC module 103 and the second DC-DC module 201 may be isolated DC-DC modules. It is proposed herein that a certain circuit is an isolated AC-DC module or an isolated DC-DC module, meaning that isolation devices are employed inside the circuit. That is, the circuit itself is insulated from ground (or other circuitry) (or, alternatively, the impedance is greater than a predetermined value). The isolation circuit (e.g., the first DC-DC module 103) may be a normal isolation circuit or a reinforced isolation circuit. The common isolation circuit can be a circuit with isolation devices inside, is concise and has low layout cost. The reinforced isolation circuit can be a circuit which is added with other isolation measures (such as adding an insulating shell and the like) on the basis of adopting an isolation device, and has high safety. The first insulation detection circuit can be connected to a circuit between the isolated second DC-DC module 201 and the DC power supply, and the second DC-DC module 201 in the branch where the first insulation detection circuit is located is an isolated DC-DC module, so that interference of other power supply branches to the insulation detection circuit can be isolated, and the insulation detection circuit can detect the state of insulation of the power supply branch where the first insulation detection circuit is located from the ground (or insulation of other parts) in real time. The insulation detection circuit (for example, a first insulation detection circuit) herein may be used to detect a resistance value of a specific portion of a power supply branch (for example, a direct current power supply branch including the direct current power supply and the second DC-DC module 201 and the second breaking device 202) corresponding to the insulation detection circuit, so as to determine a state of insulation of the power supply branch from ground (or insulation of other portions). For example, the insulation detection circuit may respectively connect resistors with different resistances connected to the circuit thereof between a power supply branch to be detected (for example, a branch composed of a direct current power supply and the second DC-DC module 201) and the ground, so as to form different detection loops, obtain the equivalent impedance of the power supply branch to be detected with respect to the ground based on different voltages obtained by connecting resistors in different detection loops, and further determine the insulation state of the power supply branch with respect to the ground. When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection of the power supply branch (for example, between the direct current power source and the second DC-DC module 201) is cut off by the breaking means, or the circuit connection between the power supply branch (for example, the direct current power supply branch including the direct current power source and the second DC-DC module 201) and the direct current bus or the load branch is cut off by the breaking means, so as to maintain the safe operation of the system. Here, the insulation detection circuit may detect a resistance value of a specific portion in the power supply branch where it is located, and determine that the ground insulation (or insulation to other portions) of the power supply branch does not satisfy the safe operation condition when the resistance value of the specific portion is less than or equal to a target value (for example, a first target resistance value). Here, the resistance value of the specific portion may be the ground resistance of the circuit branch in which the power supply (for example, direct current power supply) and the power circuit (for example, the second DC-DC module 201) are located in the power supply branch in which the insulation detection circuit is located, or the resistance of the power supply (for example, direct current power supply) or the power circuit (for example, the second DC-DC module 201) to ground in the power supply branch in which the insulation detection circuit is located. That is, the insulation detection circuit may detect the resistance value of a specific portion of the power supply branch where the insulation detection circuit is located, determine whether the insulation state of the power supply branch meets the safe operation condition, and when the power supply branch does not meet the safe operation condition, disconnect the circuit connection between the power supply branch and the load branch by indicating (or directly disconnecting or otherwise) the power supply branch so as to maintain the safe operation of the system, improve the safety of the system, and simplify the control method.
In the application, the composition mode of the functional modules in the charging system is various and flexible, and the charging system can adapt to different application scenes, thereby improving the diversity of the application scenes of the charging system and enhancing the adaptability of the charging system. Meanwhile, the breaking device in any charging system shown in the figures 1 to 5 can provide effective insulation, the safety of the system is guaranteed, meanwhile, an alternating current power supply branch circuit formed by an alternating current source and an alternating current-direct current (AC-DC) module in the charging system and a direct current power supply branch circuit formed by a direct current source and a direct current-direct current (DC-DC) module can be connected with a load through a direct current bus, the connection mode is simple, the stability of the system is improved, and the design cost is reduced.
In some application scenarios, the plurality of DC-DC modules may include a second DC-DC module and a third DC-DC module, the charging system may further include a third breaking device, and the DC power source may include a photovoltaic power source 20 and an energy storage power source 30. Fig. 6 is a schematic diagram of another application scenario of the charging system according to the embodiment of the application. As shown in fig. 6, the charging system may include an AC-DC module 101, a first DC-DC module 103, a second DC-DC module 201, a first breaking device 102 and a second breaking device 202, and may further include a third DC-DC module 301 and a third breaking device 302. Here, the photovoltaic power source 20 may be connected to a direct current bus through the second DC-DC module 201 and the second breaking device 202, the energy storage power source 30 may be connected to a direct current bus through the third DC-DC module 301 and the third breaking device 302, and the third breaking device 302 may be disposed between the third DC-DC module 301 and the direct current bus.
It will be appreciated that the charging system of the present application may be applied to an application scenario of power supplied by multiple energy sources, where multiple energy sources refer to a charging system that may provide power from multiple power sources (e.g., ac source 10, photovoltaic source 20, energy storage source 30, etc.) or other energy sources to a load 40 (e.g., a charging pile of an electric vehicle). That is, the charging system herein may include at least three power supply branches (for example, an ac power supply branch, a photovoltaic power supply branch, a pure energy storage power supply branch, etc.) capable of providing electric energy, and transmit the electric energy of these power supply branches to the load 40 or a circuit of the load end or an electric device of the load end, so as to adapt to the application scenario diversity of the charging system, and meet the increasing power supply requirement of the load end. In some application scenarios, the charging system may also transmit power from one (or several) power sources (e.g., ac power source 10, photovoltaic power source 20, energy storage power source 30, etc.) or other energy sources to other (or several) power supply branches (e.g., ac power supply branches, photovoltaic power supply branches, pure energy storage power supply branches, etc.). For example, the charging system may transfer electrical energy generated by the photovoltaic power source 20 to an ac power supply branch, a pure energy storage power supply branch, or the like. It will be appreciated that the charging system herein includes a variety of power supply branches, may be adapted for a variety of applications, and may be adapted to power a large scale load 40 (e.g., a large number of charging posts). Here, charging system can connect multiple power supply branch road in direct current generating line to through direct current generating line with electric energy transmission to the load end, unified the relation of connection of system, promoted the stability of system, and be convenient for lay, reduced the design cost of system. The load end may include a load 40, or a power circuit, or a consumer, or a load branch composed of the power circuit and the load 40 (for example, a load branch composed of the first DC-DC module 103 and the load 40), or the like. In addition, each power supply branch of the charging system in the present application may include a breaking device (for example, the first breaking device 102, the second breaking device 202, and the third breaking device 302), where the breaking device may cut off the circuit connection of the power supply branch when the insulation of one power supply branch to the ground (or the insulation of other parts) in the system does not meet the safe operation condition, or cut off the circuit connection between the power supply branch and the load 40 (or the other power supply branches) so as to maintain the safe operation of the system. It will be understood that, where insulation of a certain power supply branch from ground (or insulation of other parts) does not meet the safe operating condition, this may refer to a situation where a certain power supply branch is shorted to ground (or to other parts), or there is a leakage current between the power supply branch and ground (or between the power supply branch and other parts), or the impedance to ground (or to other parts) is less than a preset value, and so on, which does not meet the safe operating condition of the system. It is further understood that each breaking device in the present application may also control whether the corresponding power supply branch is connected to the system to supply power to the load 40 (or other power supply branches) or whether the corresponding power supply branch is connected to the system to receive power from other power supply branches according to the operation state of the system or according to the load condition of the load 40. Correspondingly, the breaking device can also control whether the corresponding power supply branch is disconnected from the system according to the running state of the system so as to overhaul or maintain the system. The breaking means here may comprise a circuit or a device of a circuit breaker, a contactor or the like having a function of shutting off a circuit connection inside the power supply branch.
In the application, the charging system can transmit the electric energy provided by different power supply branches to the load 40, or transmit the electric energy of one or a plurality of power supply branches to another power supply branch or another plurality of power supply branches, so that the applicability is strong. Meanwhile, each power supply branch circuit can be connected with a direct current bus and supplies power to the load 40 (or a circuit or electric equipment at a load end) through the direct current bus, so that the system can conveniently add a new power supply branch circuit or remove an original power supply branch circuit while the stability of the system is improved, the application range and the application scene of the system are also increased, and the charging system can adapt to more diversified loads 40 and supply power for the loads. In addition, the charging system is provided with breaking devices (for example, the first breaking device 102, the second breaking device 202 and the third breaking device 302) in each power supply branch, so that reliable insulation is provided in the system, the safety of the system is improved, the structure is simple, and the layout cost of the system can be reduced.
In some possible embodiments, please refer to fig. 7, fig. 7 is a schematic diagram of a charging system according to an embodiment of the present application. As shown in fig. 7, the charging system may include an AC-DC module 101, a first DC-DC module 103, a second DC-DC module 201, a first breaking device 102, a second breaking device 202, a third DC-DC module 301, and a third breaking device 302, and may further include a fourth breaking device 104 and a fifth breaking device 105. Here, the fourth breaking device 104 may be used to connect between the AC-DC module 101 and the direct current bus, and the fifth breaking device 105 may be used to connect between the first DC-DC module 103 and the direct current bus.
In the application, the alternating current power supply branch circuit and the load branch circuit of the charging system can be uniformly distributed or separately distributed. For example, the AC-DC module 101 of the AC power supply branch and the load branch (including the load end or the functional module connected to the load 40, such as the first DC-DC module 103) of the charging system may be disposed in the same housing (for example, disposed in a charging pile or a charger corresponding to the load 40), so as to reduce the volume of the charging system and save the layout cost and the occupation cost. In addition, the AC-DC module 101 of the AC power supply branch in the charging system may be disposed outside the casing where the load branch is located (for example, disposed outside the charging pile or the charger corresponding to the load 40), so as to enhance flexibility of the system. Here, since the AC power supply branch and the load branch of the charging system may be uniformly laid out or separately laid out, correspondingly, between the AC power supply branch and the load branch (for example, between the AC-DC module 101 of the AC power supply branch and the first DC-DC module 103 of the load branch), breaking means (for example, the fourth breaking means 104 and the fifth breaking means 105) may be included, where the breaking means may cut off the circuit connection of the AC power supply branch or the load branch when the ground insulation (or insulation to other parts) of the circuit branch where the AC power supply branch or the load is located does not satisfy the safe operation condition, or cut off the circuit connection between the AC power supply branch and the load branch, so as to maintain the safe operation of the system. It is understood that the insulation to ground (or insulation to other parts) of the circuit branch where the ac power supply branch or the load is located does not satisfy the safe operation condition, which may refer to a situation that the ac power supply branch or the load branch is shorted to ground (or to other parts), or there is a leakage current between the ac power supply branch or the load branch and ground (or between the ac power supply branch and other parts), or the impedance to ground (or to other parts) is smaller than a preset value, or the like, which does not satisfy the safe operation condition of the system. It will be further appreciated that the fourth breaking device 104 and the fifth breaking device 105 in the present application may also control whether the ac power supply branch is connected to the system to supply power to the load 40 (or other power supply branches) according to the operation state of the system or according to the load condition of the load 40, or control whether the ac power supply branch and the load branch are connected to the system to receive power from other power supply branches. Accordingly, the fourth breaking device 104 and the fifth breaking device 105 in the present application may also control whether the ac power supply branch or the load branch is disconnected from the system according to the operation state of the system so as to repair or maintain the ac power supply branch or the load branch. The breaking means here may comprise a circuit or a device of a circuit breaker, a contactor or the like having a function of shutting off a circuit connection inside the power supply branch.
In the application, the charging system can transmit the electric energy provided by different power supply branches to the load 40, or transmit the electric energy of one or a plurality of power supply branches to another power supply branch or another plurality of power supply branches, so that the applicability is strong. Meanwhile, the charging system is provided with breaking devices (for example, the first breaking device 102, the second breaking device 202 and the third breaking device 302) in each power supply branch circuit, so that reliable insulation is provided in the system, the safety of the system is improved, the structure is simple, and the layout cost of the system can be reduced.
In some possible embodiments, please refer to fig. 8, fig. 8 is another schematic structural diagram of a charging system according to an embodiment of the present application. As shown in fig. 8, the charging system may include three DC-DC modules, namely, a first DC-DC module 103, a second DC-DC module 201 and a third DC-DC module 301, the AC-DC module 101 does not include an isolation device as a non-isolated AC-DC module, the first DC-DC module 103 includes an isolation device as an isolated DC-DC module, the second DC-DC module 201 and the third DC-DC module 301 do not include an isolation device as a non-isolated DC-DC module, the charging system may further include a second leakage current detection circuit (i.e., RCD1 in fig. 8) and a third leakage current detection circuit (i.e., RCD2 in fig. 8) connected to a circuit between the second DC-DC module 201 and the second breaking device 202, and the third leakage current detection circuit is connected to a circuit between the third DC-DC module 301 and the third breaking device 302. The second leakage current detection circuit may be configured to break a circuit connection between the second DC-DC module 201 and the second breaking device 202 when a ground current of a circuit branch in which the second DC-DC module 201 and the second breaking device 202 are located is greater than or equal to a second target current value. The third leakage current detection circuit may be configured to disconnect the circuit connection between the third DC-DC module 301 and the third breaking device 302 when the ground current of the circuit branch where the third DC-DC module 301 and the third breaking device 302 are located is greater than or equal to a third target current value.
It is understood that the AC-DC module 101 herein may be a non-isolated AC-DC module, the first DC-DC module 103 may be an isolated DC-DC module, and the second DC-DC module 201 and the third DC-DC module 301 may be non-isolated DC-DC modules. It is proposed herein that a certain circuit is an isolated AC-DC module or an isolated DC-DC module, meaning that isolation devices are employed inside the circuit. That is, the circuit itself is insulated from ground (or other circuitry) (or, alternatively, the impedance is greater than a predetermined value). The isolation circuit (e.g., the first DC-DC module 103) may be a normal isolation circuit or a reinforced isolation circuit. The common isolation circuit can be a circuit with isolation devices inside, is concise and has low layout cost. The reinforced isolation circuit can be a circuit which is added with other isolation measures (such as adding an insulating shell and the like) on the basis of adopting an isolation device, and has high safety. It is proposed herein that a certain circuit is a non-isolated AC-DC module or a non-isolated DC-DC module, meaning that a non-isolated device is employed inside the circuit, i.e. the circuit itself is non-isolated (or, in other words, has an impedance less than a preset value) with respect to ground (or other circuit). The leakage current detection circuit (for example, the second leakage current detection circuit and the third leakage current detection circuit) herein may be used to detect a current difference value flowing in and out of an access point of a power supply branch corresponding to the leakage current detection circuit (for example, a photovoltaic power supply branch including the photovoltaic power supply 20 and the second DC-DC module 201 and the second breaking device 202, or a pure energy storage power supply branch including the energy storage power supply 30 and the third DC-DC module 301 and the third breaking device 302) where the leakage current detection circuit accesses the power supply branch, so as to determine a state of insulation of the power supply branch from ground (or insulation of other parts). When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection between the power supply branch (e.g. between the second DC-DC module 201 and the second breaking device 202, or between the third DC-DC module 301 and the third breaking device 302) or the breaking device cuts off the circuit connection between the power supply branch (e.g. the photovoltaic power supply branch comprising the photovoltaic power supply 20 and the second DC-DC module 201 and the second breaking device 202, or the pure energy storage power supply branch comprising the energy storage power supply 30 and the third DC-DC module 301 and the third breaking device 302) and the direct current bus or the load branch) is cut off by the breaking device to maintain the safe operation of the system. Here, the leakage current detection circuit may detect a difference between currents flowing in and flowing out of an access point of the leakage current detection circuit to the power supply branch in the power supply branch where the leakage current detection circuit is located, and determine that the ground insulation (or insulation to other parts) of the power supply branch does not satisfy the safe operation condition when the difference between currents flowing in and flowing out of the leakage current detection circuit to the access point of the power supply branch is greater than or equal to a target value (for example, a second target current value or a third target current value). That is, the leakage current detection circuit can detect the current difference value of the current flowing in and out of the access point of the power supply branch where the leakage current detection circuit of the power supply branch is located, determine whether the insulation state of the power supply branch meets the safe operation condition, and when the power supply branch does not meet the safe operation condition, disconnect the circuit connection between the power supply branch and the load branch by indicating (or directly disconnecting or otherwise) to maintain the safe operation of the system, improve the safety of the system, and the control method is simple and convenient.
In some possible embodiments, please refer to fig. 9, fig. 9 is another schematic structural diagram of a charging system according to an embodiment of the present application. As shown in fig. 9, the charging system may include three DC-DC modules, namely, a first DC-DC module 103, a second DC-DC module 201 and a third DC-DC module 301, the AC-DC module 101 does not include an isolation device as a non-isolated AC-DC module, the first DC-DC module 103 and the second DC-DC module 201 include an isolation device as an isolated DC-DC module, the third DC-DC module 301 does not include an isolation device as a non-isolated DC-DC module, the charging system may further include a second insulation detection circuit (i.e., an imd in fig. 9) and a third leakage current detection circuit (i.e., an RCD in fig. 9) connected to a circuit between the photovoltaic power source 20 and the second DC-DC module 201, and the third leakage current detection circuit is connected to a circuit between the third DC-DC module 301 and the third breaking device 302. The second insulation detection circuit may be configured to disconnect the circuit connection between the photovoltaic power supply 20 and the second DC-DC module 201 when the ground resistance of the circuit branch in which the photovoltaic power supply 20 and the second DC-DC module 201 are located is less than or equal to the second target resistance value. The third leakage current detection circuit may be configured to disconnect the circuit connection between the third DC-DC module 301 and the third breaking device 302 when the ground current of the circuit branch where the third DC-DC module 301 and the third breaking device 302 are located is greater than or equal to a third target current value.
It will be appreciated that the AC-DC module 101 herein may be a non-isolated AC-DC module, the first DC-DC module 103 and the second DC-DC module 201 may be isolated DC-DC modules, and the third DC-DC module 301 may be a non-isolated DC-DC module. It is proposed herein that a certain circuit is an isolated AC-DC module or an isolated DC-DC module, meaning that isolation devices are employed inside the circuit. That is, the circuit itself is insulated from ground (or other circuitry) (or, alternatively, the impedance is greater than a predetermined value). The isolation circuit (e.g., the first DC-DC module 103) may be a normal isolation circuit or a reinforced isolation circuit. The common isolation circuit can be a circuit with isolation devices inside, is concise and has low layout cost. The reinforced isolation circuit can be a circuit which is added with other isolation measures (such as adding an insulating shell and the like) on the basis of adopting an isolation device, and has high safety. It is proposed herein that a certain circuit is a non-isolated AC-DC module or a non-isolated DC-DC module, meaning that a non-isolated device is employed inside the circuit, i.e. the circuit itself is non-isolated (or, in other words, has an impedance less than a preset value) with respect to ground (or other circuit). The leakage current detection circuit (e.g., the third leakage current detection circuit) herein may be used to detect a current difference value flowing in and flowing out of an access point of the leakage current detection circuit in a power supply branch (e.g., a pure energy storage power supply branch including the energy storage power supply 30, the third DC-DC module 301 and the third breaking device 302) corresponding to the leakage current detection circuit, so as to determine a state of insulation of the power supply branch from ground (or insulation of other parts). When the power supply branch is insulated from ground (or from other parts) not meeting the safe operation condition, the circuit connection between the power supply branch (e.g., between the third DC-DC module 301 and the third breaking device 302) and the direct current bus or the load branch is cut off by the breaking device, or the circuit connection between the power supply branch (e.g., the pure energy storage power supply branch including the energy storage power source 30 and the third DC-DC module 301 and the third breaking device 302) and the direct current bus or the load branch is cut off by the breaking device, so as to maintain the safe operation of the system. Here, the leakage current detection circuit may detect a difference between currents flowing in and flowing out of an access point of the leakage current detection circuit to the power supply branch in the power supply branch where the leakage current detection circuit is located, and determine that the ground insulation (or insulation to other parts) of the power supply branch does not satisfy the safe operation condition when the difference between currents flowing in and flowing out of the leakage current detection circuit to the access point of the power supply branch is greater than or equal to a target value (for example, a third target current value). That is, the leakage current detection circuit can detect the current difference value of the current flowing in and out of the access point of the power supply branch where the leakage current detection circuit of the power supply branch is located, determine whether the insulation state of the power supply branch meets the safe operation condition, and when the power supply branch does not meet the safe operation condition, disconnect the circuit connection between the power supply branch and the load branch by indicating (or directly disconnecting or otherwise) to maintain the safe operation of the system, improve the safety of the system, and the control method is simple and convenient. The insulation detection circuit (for example, the second insulation detection circuit) herein may be used to detect a resistance value of a specific portion of a power supply branch (for example, a photovoltaic power supply branch including the photovoltaic power supply 20 and the second DC-DC module 201 and the second breaking device 202) corresponding to the insulation detection circuit, so as to determine a state of insulation of the power supply branch from ground (or insulation of other portions). When the power supply branch is insulated from ground (or from other parts) not meeting the safe operation condition, the circuit connection between the power supply branch (e.g., between the photovoltaic power supply 20 and the second DC-DC module 201) and the direct current bus or the load branch is cut off by the breaking means, or the breaking means cuts off the circuit connection between the power supply branch (e.g., the photovoltaic power supply branch including the photovoltaic power supply 20 and the second DC-DC module 201 and the second breaking means 202) and the direct current bus or the load branch, to maintain the safe operation of the system. Here, the insulation detection circuit may detect a resistance value of a specific portion in the power supply branch where it is located, and determine that the ground insulation (or insulation to other portions) of the power supply branch does not satisfy the safe operation condition when the resistance value of the specific portion is less than or equal to a target value (for example, a second target resistance value). Here, the resistance value of the specific portion may be the ground resistance of the circuit branch in which the power supply and the power circuit (for example, the photovoltaic power supply 20 and the second DC-DC module 201) are located in the power supply branch in which the insulation detection circuit is located, or the resistance of the power supply and the power circuit (for example, the photovoltaic power supply 20 and the second DC-DC module 201) to the ground in the power supply branch in which the insulation detection circuit is located. That is, the insulation detection circuit may detect the resistance value of a specific portion of the power supply branch where the insulation detection circuit is located, determine whether the insulation state of the power supply branch meets the safe operation condition, and when the power supply branch does not meet the safe operation condition, disconnect the circuit connection between the power supply branch and the load branch by indicating (or directly disconnecting or otherwise) the power supply branch so as to maintain the safe operation of the system, improve the safety of the system, and simplify the control method.
In some possible embodiments, please refer to fig. 10, fig. 10 is another schematic structural diagram of a charging system according to an embodiment of the present application. As shown in fig. 10, the charging system may include three DC-DC modules, namely, a first DC-DC module 103, a second DC-DC module 201 and a third DC-DC module 301, the AC-DC module 101 does not include an isolation device as a non-isolated AC-DC module, the first DC-DC module 103 and the third DC-DC module 301 include an isolation device as an isolated DC-DC module, the second DC-DC module 201 does not include an isolation device as a non-isolated DC-DC module, the charging system may further include a second leakage current detection circuit (i.e., RCD in fig. 10) and a third insulation detection circuit (i.e., imd in fig. 10) connected to a circuit between the second DC-DC module 201 and the second breaking device 202, and the third insulation detection circuit is connected to a circuit between the energy storage power supply 30 and the third DC-DC module 301. The second leakage current detection circuit may be configured to break a circuit connection between the second DC-DC module 201 and the second breaking device 202 when a ground current of a circuit branch in which the second DC-DC module 201 and the second breaking device 202 are located is greater than or equal to a second target current value. The third insulation detection circuit may be configured to disconnect the circuit connection between the energy storage power supply 30 and the third DC-DC module 301 when the ground resistance of the circuit branch where the energy storage power supply 30 and the third DC-DC module 301 are located is less than or equal to the third target resistance value.
It will be appreciated that the AC-DC module 101 herein may be a non-isolated AC-DC module, the first DC-DC module 103 and the third DC-DC module 301 may be isolated DC-DC modules, and the second DC-DC module 201 may be a non-isolated DC-DC module. It is proposed herein that a certain circuit is an isolated AC-DC module or an isolated DC-DC module, meaning that isolation devices are employed inside the circuit. That is, the circuit itself is insulated from ground (or other circuitry) (or, alternatively, the impedance is greater than a predetermined value). The isolation circuit (e.g., the first DC-DC module 103) may be a normal isolation circuit or a reinforced isolation circuit. The common isolation circuit can be a circuit with isolation devices inside, is concise and has low layout cost. The reinforced isolation circuit can be a circuit which is added with other isolation measures (such as adding an insulating shell and the like) on the basis of adopting an isolation device, and has high safety. It is proposed herein that a certain circuit is a non-isolated AC-DC module or a non-isolated DC-DC module, meaning that a non-isolated device is employed inside the circuit, i.e. the circuit itself is non-isolated (or, in other words, has an impedance less than a preset value) with respect to ground (or other circuit). The leakage current detection circuit (for example, the second leakage current detection circuit) herein may be used to detect a current difference value flowing in and flowing out of an access point of the leakage current detection circuit where the leakage current detection circuit accesses the power supply branch (for example, a photovoltaic power supply branch including the photovoltaic power supply 20 and the second DC-DC module 201 and the second breaking device 202) in a power supply branch corresponding to the leakage current detection circuit, so as to determine a state of insulation of the power supply branch from ground (or insulation of other parts). When the power supply branch is insulated from ground (or from other parts) not meeting the safe operation condition, the circuit connection between the power supply branch (e.g., between the second DC-DC module 201 and the second breaking device 202) and the direct current bus or the load branch is cut off by the breaking device, or the circuit connection between the power supply branch (e.g., the photovoltaic power supply branch including the photovoltaic power source 20 and the second DC-DC module 201 and the second breaking device 202) and the direct current bus or the load branch is cut off by the breaking device to maintain the safe operation of the system. Here, the leakage current detection circuit may detect a difference between currents flowing in and flowing out of an access point of the leakage current detection circuit to the power supply branch in the power supply branch where the leakage current detection circuit is located, and determine that the ground insulation (or insulation to other parts) of the power supply branch does not satisfy the safe operation condition when the difference between currents flowing in and flowing out of the leakage current detection circuit to the access point of the power supply branch is greater than or equal to a target value (for example, a second target current value). That is, the leakage current detection circuit can detect the current difference value of the current flowing in and out of the access point of the power supply branch where the leakage current detection circuit of the power supply branch is located, determine whether the insulation state of the power supply branch meets the safe operation condition, and when the power supply branch does not meet the safe operation condition, disconnect the circuit connection between the power supply branch and the load branch by indicating (or directly disconnecting or otherwise) to maintain the safe operation of the system, improve the safety of the system, and the control method is simple and convenient. The insulation detection circuit (e.g., the third insulation detection circuit) herein may be used to detect the resistance value of a specific portion of the power supply branch (e.g., the pure energy storage power supply branch including the energy storage power supply 30 and the third DC-DC module 301 and the third breaking device 302) corresponding to the insulation detection circuit, so as to determine the state of insulation of the power supply branch from ground (or insulation of other portions). When the power supply branch is insulated from ground (or from other parts) and the safe operation condition is not met, the circuit connection between the power supply branch (for example, between the energy storage power supply 30 and the third DC-DC module 301) and the direct current bus or the load branch is cut off by the breaking device, or the circuit connection between the power supply branch (for example, the pure energy storage power supply branch including the energy storage power supply 30 and the third DC-DC module 301 and the third breaking device 302) and the direct current bus or the load branch is cut off by the breaking device, so as to maintain the safe operation of the system. Here, the insulation detection circuit may detect a resistance value of a specific portion in the power supply branch where it is located, and determine that the ground insulation (or insulation to other portions) of the power supply branch does not satisfy the safe operation condition when the resistance value of the specific portion is less than or equal to a target value (for example, a third target resistance value). Here, the resistance value of the specific portion may be the ground resistance of the circuit branch in which the power supply and the power circuit (for example, the energy storage power supply 30 and the third DC-DC module 301) are located in the power supply branch in which the insulation detection circuit is located, or the ground resistance of the power supply and the power circuit (for example, the energy storage power supply 30 and the third DC-DC module 301) in the power supply branch in which the insulation detection circuit is located. That is, the insulation detection circuit may detect the resistance value of a specific portion of the power supply branch where the insulation detection circuit is located, determine whether the insulation state of the power supply branch meets the safe operation condition, and when the power supply branch does not meet the safe operation condition, disconnect the circuit connection between the power supply branch and the load branch by indicating (or directly disconnecting or otherwise) the power supply branch so as to maintain the safe operation of the system, improve the safety of the system, and simplify the control method.
In some possible embodiments, please refer to fig. 11, fig. 11 is another schematic structural diagram of a charging system according to an embodiment of the present application. As shown in fig. 11, the charging system may include three DC-DC modules, namely, a first DC-DC module 103, a second DC-DC module 201, and a third DC-DC module 301, the AC-DC module 101 does not include an isolation device as a non-isolated AC-DC module, the first DC-DC module 103, the second DC-DC module 201, and the third DC-DC module 301 include an isolation device as an isolated DC-DC module, and the charging system may further include a second insulation detection circuit (i.e., I MD1 in fig. 11) and a third insulation detection circuit (i.e., I MD2 in fig. 11) connected to a circuit between the photovoltaic power source 20 and the second DC-DC module 201, and the third insulation detection circuit is connected to a circuit between the energy storage power source 30 and the third DC-DC module 301. The second insulation detection circuit may be configured to disconnect the circuit connection between the photovoltaic power supply 20 and the second DC-DC module 201 when the ground resistance of the circuit branch in which the photovoltaic power supply 20 and the second DC-DC module 201 are located is less than or equal to the second target resistance value. The third insulation detection circuit may be configured to disconnect the circuit connection between the energy storage power supply 30 and the third DC-DC module 301 when the ground resistance of the circuit branch where the energy storage power supply 30 and the third DC-DC module 301 are located is less than or equal to the third target resistance value.
It is understood that the AC-DC module 101 herein may be a non-isolated AC-DC module, and the first, second and third DC-DC modules 103, 201 and 301 may be isolated DC-DC modules. It is proposed herein that a certain circuit is an isolated AC-DC module or an isolated DC-DC module, meaning that isolation devices are employed inside the circuit. That is, the circuit itself is insulated from ground (or other circuitry) (or, alternatively, the impedance is greater than a predetermined value). The isolation circuit (e.g., the first DC-DC module 103) may be a normal isolation circuit or a reinforced isolation circuit. The common isolation circuit can be a circuit with isolation devices inside, is concise and has low layout cost. The reinforced isolation circuit can be a circuit which is added with other isolation measures (such as adding an insulating shell and the like) on the basis of adopting an isolation device, and has high safety. It is proposed herein that a certain circuit is a non-isolated AC-DC module or a non-isolated DC-DC module, meaning that a non-isolated device is employed inside the circuit, i.e. the circuit itself is non-isolated (or, in other words, has an impedance less than a preset value) with respect to ground (or other circuit). The insulation detection circuit (for example, the second insulation detection circuit and the third insulation detection circuit) herein may be used to detect the resistance value of a specific part of the power supply branch (for example, a photovoltaic power supply branch including the photovoltaic power supply 20 and the second DC-DC module 201 and the second breaking device 202, or a pure energy storage power supply branch including the energy storage power supply 30 and the third DC-DC module 301 and the third breaking device 302) corresponding to the insulation detection circuit, so as to determine the state of insulation of the power supply branch from ground (or insulation of other parts). When the ground isolation (or isolation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection between the power supply branch (e.g. between the photovoltaic power supply 20 and the second DC-DC module 201, or between the energy storage power supply 30 and the third DC-DC module 301) or the breaking device cuts off the circuit connection between the power supply branch (e.g. the photovoltaic power supply branch comprising the photovoltaic power supply 20 and the second DC-DC module 201 and the second breaking device 202, or the pure energy storage power supply branch comprising the energy storage power supply 30 and the third DC-DC module 301 and the third breaking device 302) and the direct current bus or load branch is cut off by the breaking device to maintain the safe operation of the system. Here, the insulation detection circuit may detect a resistance value of a specific portion in the power supply branch where the insulation detection circuit is located, and determine that the ground insulation (or insulation to other portions) of the power supply branch does not satisfy the safe operation condition when the resistance value of the specific portion is less than or equal to a target value (for example, the second target resistance value or the third target resistance value). Here, the resistance value of the specific portion may be the ground resistance of the circuit branch in which the power supply and the power circuit (for example, the photovoltaic power supply 20 and the second DC-DC module 201, or the energy storage power supply 30 and the third DC-DC module 301) are located in the power supply branch in which the insulation detection circuit is located, or the resistance of the power supply and the power circuit (for example, the photovoltaic power supply 20 and the second DC-DC module 201, or the energy storage power supply 30 and the third DC-DC module 301) to the ground in the power supply branch in which the insulation detection circuit is located. That is, the insulation detection circuit may detect the resistance value of a specific portion of the power supply branch where the insulation detection circuit is located, determine whether the insulation state of the power supply branch meets the safe operation condition, and when the power supply branch does not meet the safe operation condition, disconnect the circuit connection between the power supply branch and the load branch by indicating (or directly disconnecting or otherwise) the power supply branch so as to maintain the safe operation of the system, improve the safety of the system, and simplify the control method.
In some possible embodiments, please refer to fig. 12, fig. 12 is another schematic structural diagram of a charging system according to an embodiment of the present application. As shown in fig. 12, the charging system may include three DC-DC modules, namely, a first DC-DC module 103, a second DC-DC module 201 and a third DC-DC module 301, the AC-DC module 101 includes an isolation device being an isolated AC-DC module, the first DC-DC module 103 includes an isolation device being an isolated DC-DC module, the second DC-DC module 201 and the third DC-DC module 301 do not include an isolation device being a non-isolated DC-DC module, and the charging system may further include a second insulation detection circuit (i.e., an imd 1 in fig. 12) and a third insulation detection circuit (i.e., an imd 2 in fig. 12) connected to a circuit between the second DC-DC module 201 and the second breaking device 202, and the third insulation detection circuit connected to a circuit between the third DC-DC module 301 and the third breaking device 302. The second insulation detection circuit may be configured to break the circuit connection between the second DC-DC module 201 and the second breaking device 202 when the ground resistance of the circuit branch in which the second DC-DC module 201 and the second breaking device 202 are located is less than or equal to the second target resistance value. The third insulation detection circuit may be used to break the circuit connection between the third DC-DC module 301 and the third breaking device 302 when the ground resistance of the circuit branch where the third DC-DC module 301 and the third breaking device 302 are located is less than or equal to a third target resistance value.
It is understood that the AC-DC module 101 herein may be an isolated AC-DC module, the first DC-DC module 103 may be an isolated DC-DC module, and the second DC-DC module 201 and the third DC-DC module 301 may be non-isolated DC-DC modules. It is proposed herein that a certain circuit is an isolated AC-DC module or an isolated DC-DC module, meaning that isolation devices are employed inside the circuit. That is, the circuit itself is insulated from ground (or other circuitry) (or, alternatively, the impedance is greater than a predetermined value). The isolation circuit (e.g., the first DC-DC module 103) may be a normal isolation circuit or a reinforced isolation circuit. The common isolation circuit can be a circuit with isolation devices inside, is concise and has low layout cost. The reinforced isolation circuit can be a circuit which is added with other isolation measures (such as adding an insulating shell and the like) on the basis of adopting an isolation device, and has high safety. It is proposed herein that a certain circuit is a non-isolated AC-DC module or a non-isolated DC-DC module, meaning that a non-isolated device is employed inside the circuit, i.e. the circuit itself is non-isolated (or, in other words, has an impedance less than a preset value) with respect to ground (or other circuit). The insulation detection circuit (for example, the second insulation detection circuit and the third insulation detection circuit) herein may be used to detect the resistance value of a specific part of the power supply branch (for example, a photovoltaic power supply branch including the photovoltaic power supply 20 and the second DC-DC module 201 and the second breaking device 202, or a pure energy storage power supply branch including the energy storage power supply 30 and the third DC-DC module 301 and the third breaking device 302) corresponding to the insulation detection circuit, so as to determine the state of insulation of the power supply branch from ground (or insulation of other parts). When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection between the power supply branch (e.g. between the second DC-DC module 201 and the second breaking device 202, or between the third DC-DC module 301 and the third breaking device 302) or the breaking device cuts off the circuit connection between the power supply branch (e.g. the photovoltaic power supply branch comprising the photovoltaic power supply 20 and the second DC-DC module 201 and the second breaking device 202, or the pure energy storage power supply branch comprising the energy storage power supply 30 and the third DC-DC module 301 and the third breaking device 302) and the direct current bus or the load branch) is cut off by the breaking device to maintain the safe operation of the system. Here, the insulation detection circuit may detect a resistance value of a specific portion in the power supply branch where the insulation detection circuit is located, and determine that the ground insulation (or insulation to other portions) of the power supply branch does not satisfy the safe operation condition when the resistance value of the specific portion is less than or equal to a target value (for example, the second target resistance value or the third target resistance value). Here, the resistance value of the specific portion may be the ground resistance of the circuit branch in which the power supply or the power circuit (for example, the second DC-DC module 201 and the second breaking device 202, or the third DC-DC module 301 and the third breaking device 302) is located in the power supply branch in which the insulation detection circuit is located, or the resistance to the ground of the power supply or the power circuit (for example, the second DC-DC module 201 and the second breaking device 202, or the third DC-DC module 301 and the third breaking device 302) in the power supply branch in which the insulation detection circuit is located. That is, the insulation detection circuit may detect the resistance value of a specific portion of the power supply branch where the insulation detection circuit is located, determine whether the insulation state of the power supply branch meets the safe operation condition, and when the power supply branch does not meet the safe operation condition, disconnect the circuit connection between the power supply branch and the load branch by indicating (or directly disconnecting or otherwise) the power supply branch so as to maintain the safe operation of the system, improve the safety of the system, and simplify the control method.
In some possible embodiments, please refer to fig. 13, fig. 13 is another schematic structural diagram of a charging system according to an embodiment of the present application. As shown in fig. 13, the charging system may include three DC-DC modules, namely, a first DC-DC module 103, a second DC-DC module 201 and a third DC-DC module 301, the AC-DC module 101 includes an isolation device that is an isolated AC-DC module, the first DC-DC module 103 and the second DC-DC module 201 include an isolation device that is an isolated DC-DC module, the third DC-DC module 301 does not include an isolation device that is a non-isolated DC-DC module, and the charging system may further include a second insulation detection circuit (i.e., I MD1 in fig. 13) and a third insulation detection circuit (i.e., I MD2 in fig. 13) connected to a circuit between the photovoltaic power source 20 and the second DC-DC module 201, and the third insulation detection circuit connected to a circuit between the third DC-DC module 301 and the third breaking device 302. The second insulation detection circuit may be configured to disconnect the circuit connection between the photovoltaic power supply 20 and the second DC-DC module 201 when the ground resistance of the circuit branch in which the photovoltaic power supply 20 and the second DC-DC module 201 are located is less than or equal to the second target resistance value. The third insulation detection circuit may be used to break the circuit connection between the third DC-DC module 301 and the third breaking device 302 when the ground resistance of the circuit branch where the third DC-DC module 301 and the third breaking device 302 are located is less than or equal to a third target resistance value.
It will be appreciated that the AC-DC module 101 herein may be an isolated AC-DC module, the first DC-DC module 103 and the second DC-DC module 201 may be isolated DC-DC modules, and the third DC-DC module 301 may be a non-isolated DC-DC module. It is proposed herein that a certain circuit is an isolated AC-DC module or an isolated DC-DC module, meaning that isolation devices are employed inside the circuit. That is, the circuit itself is insulated from ground (or other circuitry) (or, alternatively, the impedance is greater than a predetermined value). The isolation circuit (e.g., the first DC-DC module 103) may be a normal isolation circuit or a reinforced isolation circuit. The common isolation circuit can be a circuit with isolation devices inside, is concise and has low layout cost. The reinforced isolation circuit can be a circuit which is added with other isolation measures (such as adding an insulating shell and the like) on the basis of adopting an isolation device, and has high safety. It is proposed herein that a certain circuit is a non-isolated AC-DC module or a non-isolated DC-DC module, meaning that a non-isolated device is employed inside the circuit, i.e. the circuit itself is non-isolated (or, in other words, has an impedance less than a preset value) with respect to ground (or other circuit). The insulation detection circuit (for example, the second insulation detection circuit and the third insulation detection circuit) herein may be used to detect the resistance value of a specific part of the power supply branch (for example, a photovoltaic power supply branch including the photovoltaic power supply 20 and the second DC-DC module 201 and the second breaking device 202, or a pure energy storage power supply branch including the energy storage power supply 30 and the third DC-DC module 301 and the third breaking device 302) corresponding to the insulation detection circuit, so as to determine the state of insulation of the power supply branch from ground (or insulation of other parts). When the ground insulation (or insulation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection between the power supply branch (e.g. between the photovoltaic power supply 20 and the second DC-DC module 201, or between the third DC-DC module 301 and the third breaking device 302) or the breaking device cuts off the circuit connection between the power supply branch (e.g. the photovoltaic power supply branch comprising the photovoltaic power supply 20 and the second DC-DC module 201 and the second breaking device 202, or the pure energy storage power supply branch comprising the energy storage power supply 30 and the third DC-DC module 301 and the third breaking device 302) and the direct current bus or the load branch is cut off by the breaking device to maintain the safe operation of the system. Here, the insulation detection circuit may detect a resistance value of a specific portion in the power supply branch where the insulation detection circuit is located, and determine that the ground insulation (or insulation to other portions) of the power supply branch does not satisfy the safe operation condition when the resistance value of the specific portion is less than or equal to a target value (for example, the second target resistance value or the third target resistance value). Here, the resistance value of the specific portion may be the ground resistance of the circuit branch in which the power supply or the power circuit (for example, the photovoltaic power supply 20 and the second DC-DC module 201, or the third DC-DC module 301 and the third breaking device 302) is located in the power supply branch in which the insulation detection circuit is located, or the resistance of the power supply or the power circuit (for example, the photovoltaic power supply 20 and the second DC-DC module 201, or the third DC-DC module 301 and the third breaking device 302) to the ground in the power supply branch in which the insulation detection circuit is located. That is, the insulation detection circuit may detect the resistance value of a specific portion of the power supply branch where the insulation detection circuit is located, determine whether the insulation state of the power supply branch meets the safe operation condition, and when the power supply branch does not meet the safe operation condition, disconnect the circuit connection between the power supply branch and the load branch by indicating (or directly disconnecting or otherwise) the power supply branch so as to maintain the safe operation of the system, improve the safety of the system, and simplify the control method.
In some possible embodiments, please refer to fig. 14, fig. 14 is another schematic structural diagram of a charging system according to an embodiment of the present application. As shown in fig. 14, the charging system may include three DC-DC modules, namely, a first DC-DC module 103, a second DC-DC module 201 and a third DC-DC module 301, the AC-DC module 101 includes an isolation device that is an isolated AC-DC module, the first DC-DC module 103 and the third DC-DC module 301 include an isolation device that is an isolated DC-DC module, the second DC-DC module 201 does not include an isolation device that is a non-isolated DC-DC module, and the charging system may further include a second insulation detection circuit (i.e., I MD1 in fig. 14) and a third insulation detection circuit (i.e., I MD2 in fig. 14) connected to a circuit between the second DC-DC module 201 and the second breaking device 202, and the third insulation detection circuit connected to a circuit between the energy storage power supply 30 and the third DC-DC module 301. The second insulation detection circuit may be configured to break the circuit connection between the second DC-DC module 201 and the second breaking device 202 when the ground resistance of the circuit branch in which the second DC-DC module 201 and the second breaking device 202 are located is less than or equal to the second target resistance value. The third insulation detection circuit may be configured to disconnect the circuit connection between the energy storage power supply 30 and the third DC-DC module 301 when the ground resistance of the circuit branch where the energy storage power supply 30 and the third DC-DC module 301 are located is less than or equal to the third target resistance value.
It will be appreciated that the AC-DC module 101 herein may be an isolated AC-DC module, the first DC-DC module 103 and the third DC-DC module 301 may be isolated DC-DC modules, and the second DC-DC module 201 may be non-isolated DC-DC modules. It is proposed herein that a certain circuit is an isolated AC-DC module or an isolated DC-DC module, meaning that isolation devices are employed inside the circuit. That is, the circuit itself is insulated from ground (or other circuitry) (or, alternatively, the impedance is greater than a predetermined value). The isolation circuit (e.g., the first DC-DC module 103) may be a normal isolation circuit or a reinforced isolation circuit. The common isolation circuit can be a circuit with isolation devices inside, is concise and has low layout cost. The reinforced isolation circuit can be a circuit which is added with other isolation measures (such as adding an insulating shell and the like) on the basis of adopting an isolation device, and has high safety. It is proposed herein that a certain circuit is a non-isolated AC-DC module or a non-isolated DC-DC module, meaning that a non-isolated device is employed inside the circuit, i.e. the circuit itself is non-isolated (or, in other words, has an impedance less than a preset value) with respect to ground (or other circuit). The insulation detection circuit (for example, the second insulation detection circuit and the third insulation detection circuit) herein may be used to detect the resistance value of a specific part of the power supply branch (for example, a photovoltaic power supply branch including the photovoltaic power supply 20 and the second DC-DC module 201 and the second breaking device 202, or a pure energy storage power supply branch including the energy storage power supply 30 and the third DC-DC module 301 and the third breaking device 302) corresponding to the insulation detection circuit, so as to determine the state of insulation of the power supply branch from ground (or insulation of other parts). When the ground isolation (or isolation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection between the power supply branch (e.g. between the second DC-DC module 201 and the second breaking device 202, or between the energy storage power supply 30 and the third DC-DC module 301) or the breaking device cuts off the circuit connection between the power supply branch (e.g. the photovoltaic power supply branch comprising the photovoltaic power supply 20 and the second DC-DC module 201 and the second breaking device 202, or the pure energy storage power supply branch comprising the energy storage power supply 30 and the third DC-DC module 301 and the third breaking device 302) and the direct current bus or load branch is cut off by the breaking device to maintain the safe operation of the system. Here, the insulation detection circuit may detect a resistance value of a specific portion in the power supply branch where the insulation detection circuit is located, and determine that the ground insulation (or insulation to other portions) of the power supply branch does not satisfy the safe operation condition when the resistance value of the specific portion is less than or equal to a target value (for example, the second target resistance value or the third target resistance value). Here, the resistance value of the specific portion may be the ground resistance of the circuit branch in which the power supply or the power circuit (for example, the second DC-DC module 201 and the second breaking device 202, or the energy storage power supply 30 and the third DC-DC module 301) is located in the power supply branch in which the insulation detection circuit is located, or the resistance of the power supply or the power circuit (for example, the second DC-DC module 201 and the second breaking device 202, or the energy storage power supply 30 and the third DC-DC module 301) to the ground in the power supply branch in which the insulation detection circuit is located. That is, the insulation detection circuit may detect the resistance value of a specific portion of the power supply branch where the insulation detection circuit is located, determine whether the insulation state of the power supply branch meets the safe operation condition, and when the power supply branch does not meet the safe operation condition, disconnect the circuit connection between the power supply branch and the load branch by indicating (or directly disconnecting or otherwise) the power supply branch so as to maintain the safe operation of the system, improve the safety of the system, and simplify the control method.
In some possible embodiments, please refer to fig. 15, fig. 15 is another schematic structural diagram of a charging system according to an embodiment of the present application. As shown in fig. 15, the charging system may include three DC-DC modules, namely, a first DC-DC module 103, a second DC-DC module 201, and a third DC-DC module 301, the AC-DC module 101 includes an isolation device to isolate the AC-DC modules, the first DC-DC module 103, the second DC-DC module 201, and the third DC-DC module 301 include an isolation device to isolate the DC-DC modules, and the charging system may further include a second insulation detection circuit (i.e., I MD1 in fig. 15) and a third insulation detection circuit (i.e., I MD2 in fig. 15) connected to a circuit between the photovoltaic power source 20 and the second DC-DC module 201, and the third insulation detection circuit connected to a circuit between the energy storage power source 30 and the third DC-DC module 301. The second insulation detection circuit may be configured to disconnect the circuit connection between the photovoltaic power supply 20 and the second DC-DC module 201 when the ground resistance of the circuit branch in which the photovoltaic power supply 20 and the second DC-DC module 201 are located is less than or equal to the second target resistance value. The third insulation detection circuit may be configured to disconnect the circuit connection between the energy storage power supply 30 and the third DC-DC module 301 when the ground resistance of the circuit branch where the energy storage power supply 30 and the third DC-DC module 301 are located is less than or equal to the third target resistance value.
It is understood that the AC-DC module 101 herein may be an isolated AC-DC module, and the first, second and third DC-DC modules 103, 201 and 301 may be isolated DC-DC modules. It is proposed herein that a certain circuit is an isolated AC-DC module or an isolated DC-DC module, meaning that isolation devices are employed inside the circuit. That is, the circuit itself is insulated from ground (or other circuitry) (or, alternatively, the impedance is greater than a predetermined value). The isolation circuit (e.g., the first DC-DC module 103) may be a normal isolation circuit or a reinforced isolation circuit. The common isolation circuit can be a circuit with isolation devices inside, is concise and has low layout cost. The reinforced isolation circuit can be a circuit which is added with other isolation measures (such as adding an insulating shell and the like) on the basis of adopting an isolation device, and has high safety. The insulation detection circuit (for example, the second insulation detection circuit and the third insulation detection circuit) herein may be used to detect the resistance value of a specific part of the power supply branch (for example, a photovoltaic power supply branch including the photovoltaic power supply 20 and the second DC-DC module 201 and the second breaking device 202, or a pure energy storage power supply branch including the energy storage power supply 30 and the third DC-DC module 301 and the third breaking device 302) corresponding to the insulation detection circuit, so as to determine the state of insulation of the power supply branch from ground (or insulation of other parts). When the ground isolation (or isolation to other parts) of the power supply branch does not meet the safe operation condition, the circuit connection between the power supply branch (e.g. between the photovoltaic power supply 20 and the second DC-DC module 201, or between the energy storage power supply 30 and the third DC-DC module 301) or the breaking device cuts off the circuit connection between the power supply branch (e.g. the photovoltaic power supply branch comprising the photovoltaic power supply 20 and the second DC-DC module 201 and the second breaking device 202, or the pure energy storage power supply branch comprising the energy storage power supply 30 and the third DC-DC module 301 and the third breaking device 302) and the direct current bus or load branch is cut off by the breaking device to maintain the safe operation of the system. Here, the insulation detection circuit may detect a resistance value of a specific portion in the power supply branch where the insulation detection circuit is located, and determine that the ground insulation (or insulation to other portions) of the power supply branch does not satisfy the safe operation condition when the resistance value of the specific portion is less than or equal to a target value (for example, the second target resistance value or the third target resistance value). Here, the resistance value of the specific portion may be the ground resistance of the circuit branch in which the power supply and the power circuit (for example, the photovoltaic power supply 20 and the second DC-DC module 201, or the energy storage power supply 30 and the third DC-DC module 301) are located in the power supply branch in which the insulation detection circuit is located, or the resistance of the power supply and the power circuit (for example, the photovoltaic power supply 20 and the second DC-DC module 201, or the energy storage power supply 30 and the third DC-DC module 301) to the ground in the power supply branch in which the insulation detection circuit is located. That is, the insulation detection circuit may detect the resistance value of a specific portion of the power supply branch where the insulation detection circuit is located, determine whether the insulation state of the power supply branch meets the safe operation condition, and when the power supply branch does not meet the safe operation condition, disconnect the circuit connection between the power supply branch and the load branch by indicating (or directly disconnecting or otherwise) the power supply branch so as to maintain the safe operation of the system, improve the safety of the system, and simplify the control method.
In some possible embodiments, the charging system may comprise at least one first DC-DC module 103, one first DC-DC module 103 of the at least one first DC-DC module 103 being arranged within one charging peg. That is, the charging system may include at least one first DC-DC module 103, and any one of the at least one first DC-DC module 103 may be connected to the load 40 to form a load branch, and the power supply branch and the load branch may be separately disposed in the charging system. For example, one load branch (including the load end or the functional module connected to the load 40, such as the first DC-DC module 103) in the charging system may be disposed in one housing (for example, disposed in a charging pile or a charger corresponding to the load 40), and meanwhile, the AC-DC module 101 of the AC power supply branch in the charging system may be disposed outside the housing where the load branch is disposed (for example, disposed outside the charging pile or the charger corresponding to the load 40), so as to enhance flexibility of the system.
In some possible embodiments, the charging system may include at least one first DC-DC module 103 and at least one AC-DC module 101, the first DC-DC module 103 and the AC-DC module 101 being in one-to-one correspondence, one first DC-DC module 103 of the at least one first DC-DC module 103 and its corresponding AC-DC module 101 being simultaneously arranged within one charging pile. That is, the charging system may include at least one first DC-DC module 103, any DC-DC module of the at least one first DC-DC module 103 may be correspondingly connected to the load 40 to form a load branch, a power supply branch (for example, an AC power supply branch) in the charging system may include at least one AC-DC module 101, the AC-DC modules 101 may be in one-to-one correspondence with the first DC-DC module 103 in each load branch, and each load branch may be uniformly distributed with its corresponding AC-DC module 101. For example, one AC-DC module 101 of the AC power supply branch and a corresponding load branch (including the load end or the functional module connected to the load 40, such as the first DC-DC module 103) of the charging system may be disposed in the same housing (for example, disposed in a charging pile or a charger corresponding to the load 40), so as to reduce the volume of the charging system and save the layout cost and the occupation cost.
According to the application, the breaking device in the charging system can provide effective insulation, so that the safety of the system is ensured, meanwhile, an alternating current power supply branch circuit formed by an alternating current source and an AC-DC module in the charging system and a direct current power supply branch circuit formed by a direct current source and a DC-DC module can be connected with a load through a direct current bus, the connection mode is simple, the stability of the system is improved, and the design cost is reduced.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (14)

1. The charging system is characterized by comprising an AC-DC alternating current-direct current module, a plurality of DC-DC direct current-direct current modules, a direct current bus and a plurality of breaking devices, wherein the plurality of breaking devices comprise a first breaking device and a second breaking device, and the plurality of DC-DC modules comprise a first DC-DC module and a second DC-DC module;
the AC-DC module is connected with an alternating current source through the first breaking device and is used for converting alternating current output by the alternating current source into direct current and outputting the direct current to the direct current bus;
The second DC-DC module is connected with the direct current bus through the second breaking device and is used for carrying out voltage conversion on direct current output by the direct current power supply and outputting the direct current to the direct current bus;
the first DC-DC module is used for acquiring direct current from the direct current bus, converting the voltage and outputting the converted voltage to a load.
2. The charging system of claim 1, further comprising a first leakage current detection circuit connected to the circuit between the second DC-DC module and the second breaking device;
the first leakage current detection circuit is used for detecting the current to ground of a circuit branch where the second DC-DC module and the second breaking device are located;
the second breaking device is used for breaking the circuit connection between the second DC-DC module and the direct current bus when the ground current of the circuit branch where the second DC-DC module and the second breaking device are located is larger than or equal to a first target current value.
3. The charging system of claim 1, wherein the second DC-DC module comprises an isolation device, the charging system further comprising a first insulation detection circuit connected to a circuit between the direct current power supply and the second DC-DC module;
The first insulation detection circuit is used for detecting the ground resistance of a circuit branch where the direct-current power supply and the second DC-DC module are located;
the second breaking device is used for breaking the circuit connection between the second DC-DC module and the DC bus when the ground resistance of the circuit branch where the DC power supply and the second DC-DC module are located is smaller than or equal to a first resistance value.
4. The charging system of claim 1, wherein the AC-DC module comprises an isolation device, the charging system further comprising a first insulation detection circuit connected to a circuit between the direct current power supply and the second DC-DC module, or the first insulation detection circuit connected to a circuit between the second DC-DC module and the second breaking device;
the first insulation detection circuit is used for detecting the ground resistance of a circuit branch where the direct-current power supply and the second DC-DC module are located;
the second breaking device is used for breaking the circuit connection between the second DC-DC module and the DC bus when the ground resistance of the circuit branch where the DC power supply and the second DC-DC module are located is smaller than or equal to a first resistance value.
5. The charging system of claim 1, wherein the AC-DC module and the second DC-DC module each comprise an isolation device, the first insulation detection circuit being connected to a circuit between the direct current power supply and the second DC-DC module;
the first insulation detection circuit is used for detecting the ground resistance of a circuit branch where the direct-current power supply and the second DC-DC module are located;
the second breaking device is used for breaking the circuit connection between the second DC-DC module and the DC bus when the ground resistance of the circuit branch where the DC power supply and the second DC-DC module are located is smaller than or equal to a first resistance value.
6. The charging system is characterized by comprising a charging pile, a photovoltaic system, an energy storage system and a plurality of breaking devices, wherein the charging pile comprises an AC-DC module, a first DC-DC module and a direct current bus, the photovoltaic system comprises a second DC-DC module, the energy storage system comprises a third DC-DC module, and the plurality of breaking devices comprise a first breaking device, a second breaking device and a third breaking device;
the AC-DC module is connected with an alternating current source through the first breaking device and is used for converting alternating current output by the alternating current source into direct current and outputting the direct current to the direct current bus;
The second DC-DC module is connected with the direct current bus through the second breaking device and is used for carrying out voltage conversion on direct current output by the photovoltaic power supply and outputting the direct current to the direct current bus;
the third DC-DC module is connected with the direct current bus through the third breaking device and is used for carrying out voltage conversion on direct current output by the energy storage power supply and outputting the direct current to the direct current bus;
the first DC-DC module is used for acquiring direct current from the direct current bus, converting the voltage and outputting the converted voltage to a load.
7. The charging system of claim 6, further comprising a fourth breaking device for connecting between the AC-DC module and the direct current bus, and a fifth breaking device for connecting between the second DC-DC module and the direct current bus.
8. A charging system according to claim 6 or 7, further comprising a second leakage current detection circuit connected to the circuit between the second DC-DC module and the second breaking device and a third leakage current detection circuit connected to the circuit between the third DC-DC module and the third breaking device;
The second leakage current detection circuit is used for detecting the current to ground of the circuit branch where the second DC-DC module and the second breaking device are located;
the second breaking device is used for breaking the circuit connection between the second DC-DC module and the direct current bus when the ground current of the circuit branch where the second DC-DC module and the second breaking device are located is greater than or equal to a second target current value;
the third leakage current detection circuit is used for detecting the ground current of the circuit branch where the third DC-DC module and the third breaking device are located;
the third breaking device is used for breaking the circuit connection between the third DC-DC module and the direct current bus when the ground current of the circuit branch where the third DC-DC module and the third breaking device are located is larger than or equal to a third target current value.
9. A charging system according to claim 6 or 7, wherein the second DC-DC module comprises an isolation device, the charging system further comprising a second insulation detection circuit and a third leakage current detection circuit, the second insulation detection circuit being connected to the circuit between the photovoltaic power source and the second DC-DC module, the third leakage current detection circuit being connected to the circuit between the third DC-DC module and the third breaking device;
The second insulation detection circuit is used for detecting the ground resistance of a circuit branch where the photovoltaic power supply and the second DC-DC module are located;
the second breaking device is used for breaking the circuit connection between the second DC-DC module and the direct current bus when the ground resistance of the circuit branch where the photovoltaic power supply and the second DC-DC module are located is smaller than or equal to a second resistance value;
the third leakage current detection circuit is used for detecting the ground current of the circuit branch where the third DC-DC module and the third breaking device are located;
the third breaking device is used for breaking the circuit connection between the third DC-DC module and the direct current bus when the ground current of the circuit branch where the third DC-DC module and the third breaking device are located is larger than or equal to a third target current value.
10. The charging system according to claim 6 or 7, wherein the third DC-DC module comprises an isolation device, the charging system further comprising a second leakage current detection circuit connected to the circuit between the second DC-DC module and the second breaking device and a third insulation detection circuit connected to the circuit between the stored energy power source and the third DC-DC module;
The second leakage current detection circuit is used for detecting the current to ground of the circuit branch where the second DC-DC module and the second breaking device are located;
the second breaking device is used for breaking the circuit connection between the third DC-DC module and the direct current bus when the ground current of the circuit branch where the third DC-DC module and the third breaking device are located is larger than or equal to a second target current value;
the third insulation detection circuit is used for detecting the ground resistance of a circuit branch where the energy storage power supply and the third DC-DC module are located;
the third breaking device is used for breaking the circuit connection between the third DC-DC module and the direct current bus when the ground resistance of the circuit branch where the energy storage power supply and the third DC-DC module are located is smaller than or equal to a third resistance value.
11. The charging system of claim 6 or 7, wherein the second DC-DC module and the third DC-DC module each comprise an isolation device, the charging system further comprising a second insulation detection circuit and a third insulation detection circuit, the second insulation detection circuit connected to a circuit between the photovoltaic power source and the second DC-DC module, the third insulation detection circuit connected to a circuit between the energy storage power source and the third DC-DC module;
The second insulation detection circuit is used for detecting the ground resistance of a circuit branch where the photovoltaic power supply and the second DC-DC module are located;
the second breaking device is used for breaking the circuit connection between the second DC-DC module and the direct current bus when the ground resistance of the circuit branch where the photovoltaic power supply and the second DC-DC module are located is smaller than or equal to a second target resistance value;
the third insulation detection circuit is used for detecting the ground resistance of a circuit branch where the energy storage power supply and the third DC-DC module are located;
the third breaking device is used for breaking the circuit connection between the third DC-DC module and the direct current bus when the ground resistance of the circuit branch where the energy storage power supply and the third DC-DC module are located is smaller than or equal to a third target resistance value.
12. A charging system according to claim 6 or 7, wherein the AC-DC module and the second DC-DC module each comprise an isolation device, the charging system further comprising a second insulation detection circuit and a third insulation detection circuit, the second insulation detection circuit being connected to the circuit between the photovoltaic power source and the second DC-DC module, the third insulation detection circuit being connected to the circuit between the third DC-DC module and the third breaking device;
The second insulation detection circuit is used for detecting the ground resistance of a circuit branch where the photovoltaic power supply and the second DC-DC module are located;
the second breaking device is used for breaking the circuit connection between the second DC-DC module and the direct current bus when the ground resistance of the circuit branch where the second DC-DC module and the second breaking device are located is smaller than or equal to a second target resistance value;
the third insulation detection circuit is used for detecting the ground resistance of the circuit branch where the third DC-DC module and the third breaking device are located;
the third breaking device is used for breaking the circuit connection between the third DC-DC module and the direct current bus when the ground resistance of the circuit branch where the third DC-DC module and the third breaking device are located is smaller than or equal to a third target resistance value.
13. The charging system of claim 6 or 7, wherein the AC-DC module and the third DC-DC module each comprise an isolation device, the charging system further comprising a second insulation detection circuit and a third insulation detection circuit, the second insulation detection circuit being connected to the circuit between the second DC-DC module and the second breaking device, the third insulation detection circuit being connected to the circuit between the energy storage device and the third DC-DC module;
The second insulation detection circuit is used for detecting the ground resistance of the circuit branch where the second DC-DC module and the second breaking device are located;
the second breaking device is used for breaking the circuit connection between the second DC-DC module and the direct current bus when the ground resistance of the circuit branch where the second DC-DC module and the second breaking device are located is smaller than or equal to a second target resistance value;
the third insulation detection circuit is used for detecting the ground resistance of a circuit branch where the energy storage device and the third DC-DC module are located;
the third breaking device is used for breaking the circuit connection between the third DC-DC module and the direct current bus when the ground resistance of the circuit branch where the energy storage device and the third DC-DC module are located is smaller than or equal to a third target resistance value.
14. The charging system of claim 6 or 7, wherein the AC-DC module, the second DC-DC module, and the third DC-DC module each comprise an isolation device, the charging system further comprising a second insulation detection circuit and a third insulation detection circuit, the second insulation detection circuit connected to a circuit between the photovoltaic power source and the second DC-DC module, the third insulation detection circuit connected to a circuit between the energy storage device and the third DC-DC module;
The second insulation detection circuit is used for detecting the ground resistance of a circuit branch where the photovoltaic power supply and the second DC-DC module are located;
the second breaking device is used for breaking the circuit connection between the second DC-DC module and the direct current bus when the ground resistance of the circuit branch where the photovoltaic power supply and the second DC-DC module are located is smaller than or equal to a second target resistance value;
the third insulation detection circuit is used for detecting the ground resistance of a circuit branch where the energy storage device and the third DC-DC module are located;
the third breaking device is used for breaking the circuit connection between the third DC-DC module and the direct current bus when the ground resistance of the circuit branch where the energy storage device and the third DC-DC module are located is smaller than or equal to a third target resistance value.
CN202310968464.0A 2023-07-31 2023-07-31 Charging system Pending CN117040079A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310968464.0A CN117040079A (en) 2023-07-31 2023-07-31 Charging system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310968464.0A CN117040079A (en) 2023-07-31 2023-07-31 Charging system

Publications (1)

Publication Number Publication Date
CN117040079A true CN117040079A (en) 2023-11-10

Family

ID=88632912

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310968464.0A Pending CN117040079A (en) 2023-07-31 2023-07-31 Charging system

Country Status (1)

Country Link
CN (1) CN117040079A (en)

Similar Documents

Publication Publication Date Title
US20220131380A1 (en) Charging station and arrangement of electric components for controlling the delivery of electricity from an electrical grid to an electric vehicle
CA2776115C (en) Combination gfci/afci receptacle with class 2 power units
CN104753402B (en) Generator brake system and its control method
CN104052032B (en) Electric arc in direct current power system prevents
US9139100B2 (en) Vehicle power supply apparatus
KR20130124772A (en) System and method for converting electric power, and apparatus and method for controlling the system
US11273722B2 (en) Power conversion apparatus
GB2452138A (en) Power converter for vehicle
CN104953692A (en) Power supply system
CA2989137C (en) Isolated high precision pilot voltage generating circuit and electric vehicle supply equipment including the same
CN105811569B (en) A kind of hybrid energy supplying system of high voltage DC breaker
US11955836B2 (en) Power device terminal backup switch unit
JP2011234051A (en) Power line communication system
US20230264594A1 (en) Single phase vehicle to home electric vehicle supply equipment
CN111169300A (en) Device for charging a battery of an electrically driven motor vehicle
US11511638B2 (en) Electrical power converter unit, an electrical power conversion device and an industrial vehicle including this electrical power converter unit
CN117040079A (en) Charging system
US20220271554A1 (en) Universal and versatile charger for electric vehicle battery
Javid et al. Future Distribution Networks: A Review
US11491886B2 (en) DC voltage charging post for charging an electric vehicle
JP2023517116A (en) Electric vehicle charging controller and electric vehicle charging device including the same
CN111769750A (en) Rectifier assembly
US20230365010A1 (en) Bidirectional portable ev charging cable
Wunder et al. Droop controlled cognitive power electronics for DC microgrids
US20240051398A1 (en) Electric vehicle charging controller

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination