CN110549880A - hybrid energy modular charging system for electric automobile - Google Patents
hybrid energy modular charging system for electric automobile Download PDFInfo
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- CN110549880A CN110549880A CN201810555726.XA CN201810555726A CN110549880A CN 110549880 A CN110549880 A CN 110549880A CN 201810555726 A CN201810555726 A CN 201810555726A CN 110549880 A CN110549880 A CN 110549880A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 82
- 230000005540 biological transmission Effects 0.000 claims abstract description 39
- 239000003990 capacitor Substances 0.000 claims description 24
- 238000001914 filtration Methods 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 3
- 230000006698 induction Effects 0.000 description 25
- 230000001939 inductive effect Effects 0.000 description 16
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
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- 206010014357 Electric shock Diseases 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2210/00—Converter types
- B60L2210/10—DC to DC converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- 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
- Y02T90/14—Plug-in electric vehicles
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a hybrid energy modular charging system of an electric vehicle, which comprises a vehicle-mounted end system and a non-vehicle-mounted end system, wherein the vehicle-mounted end system comprises: the vehicle-mounted end system comprises a first charging plug, a first power conversion array, a DC/DC module, a battery module and a receiving end power module, wherein the first charging plug, the first power conversion array, the DC/DC module and the battery module are sequentially connected, the receiving end power module receives energy transmitted by the off-board end system, and a vehicle-mounted end controller samples and controls energy transmission of each part in the vehicle-mounted end system; the off-board end system comprises a second charging plug, a second power conversion array and a transmitting end power module, wherein the second charging plug and the second power conversion array are sequentially connected, the transmitting end power module transmits energy to the on-board end, and an off-board end controller samples and controls energy transmission of all parts in the off-board end system.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a hybrid energy modular charging system of an electric automobile.
Background
With the rapid development of electric vehicle technology, batteries, motors and electric control technology are gradually mature, but the problem of difficult charging becomes a bottleneck for limiting the popularization of electric vehicles, and the charging process is embodied in the following three aspects, namely, the charging process is inconvenient and needs manual operation; secondly, the charging process is unsafe, and a high-voltage electric shock risk exists; thirdly, when the vehicle-mounted charger is used, the charging time is long due to low charging power. The electric automobile charging system is mainly used for providing electric energy for vehicles, can be divided into fast charging (direct current charging) and slow charging (alternating current charging) according to the charging speed, can be divided into conduction type (wired) charging and induction type (wireless) charging according to the energy transmission mode, and the current charging solution in the field mainly has the following defects: (1) along with the requirement of electric automobile users on charging convenience is higher and higher, more and more urgent requirement electric automobile charging system not only can carry out conduction formula charging, also can carry out induction type charging. (2) With the demand of the electric vehicle users for the charging speed becoming higher and higher, the power of the vehicle-mounted charging system needs to be expanded as much as possible. (3) The output energy of the electric vehicle charging system can be configured, and the electric vehicle charging system is compatible with low-power charging and can be expanded according to the requirements of users, namely modular management. (4) In the existing vehicle-mounted wired charger solution, in order to meet the volume and quality requirements of the vehicle-mounted charger, the capacitance value of a direct-current bus capacitor cannot be large, so that bus voltage ripples are large under a normal charging working condition.
Disclosure of Invention
The invention aims to provide a hybrid energy modular charging system for an electric vehicle, which aims to solve the following problems: firstly, the existing conduction type charging system of the electric automobile cannot be compatible with an induction type charging system; secondly, the charging power is low under the current slow charging application of the electric automobile; thirdly, the power of the current electric vehicle charging system cannot be flexibly configured; fourthly, the direct current bus voltage ripple of the current electric vehicle conduction type charging system is large.
In order to solve the technical problem, the invention provides a hybrid energy modular charging system for an electric vehicle, which comprises a vehicle-mounted end system and a non-vehicle-mounted end system, wherein:
The vehicle-mounted end system comprises a first charging plug, a first power conversion array, a DC/DC module, a battery module and a receiving end power module, wherein the first charging plug, the first power conversion array, the DC/DC module and the battery module are sequentially connected, the receiving end power module receives energy transmitted by the off-board end system, and a vehicle-mounted end controller samples and controls energy transmission of each part in the vehicle-mounted end system;
The off-board end system comprises a second charging plug, a second power conversion array and a transmitting end power module, wherein the second charging plug and the second power conversion array are sequentially connected, the transmitting end power module transmits energy to the on-board end, and an off-board end controller samples and controls energy transmission of all parts in the off-board end system.
Optionally, in the modular charging system for hybrid energy of an electric vehicle, the receiving end power module includes a first coil, a first capacitance compensation module and a rectification module, and the transmitting end power module includes a second coil, a second capacitance compensation module and an inversion module.
Optionally, in the hybrid energy modular charging system of the electric vehicle, an output end of the second power conversion array is connected to the inverter module, the inverter module is connected to the second capacitance compensation module, the second capacitance compensation module is connected to the second coil, the second coil is coupled to the first coil, and the first coil is connected to the first capacitance compensation module; the transmitted energy sequentially passes through the second power conversion array, the inversion module, the second capacitance compensation module, the second coil, the first coil and the first capacitance compensation module.
Optionally, in the hybrid energy modular charging system for the electric vehicle, an output end of the first capacitance compensation module is connected to an input end of the rectification module, and an output end of the rectification module is connected to an input end of the DC/DC module; the transmitted energy sequentially passes through the first capacitance compensation module, the rectification module, the DC/DC module and the battery module.
optionally, in the modular charging system for hybrid energy of an electric vehicle, the DC/DC module includes an H-bridge inverter module in the DC/DC module, a topology compensation module in the DC/DC module, a transformer module in the DC/DC module, a rectifier module in the DC/DC module, and a filter module in the DC/DC module, which are connected in sequence, and an output end of the filter module in the DC/DC module is connected to an input end of the battery module.
Optionally, in the hybrid energy modular charging system for an electric vehicle, an output end of the first capacitance compensation module is connected to an input end of the rectification module, an output end of the rectification module is connected to an input end of the filtering module in the DC/DC module, and the transmitted energy sequentially passes through the first capacitance compensation module, the rectification module, the filtering module in the DC/DC module, and the battery module.
Optionally, in the hybrid energy modular charging system for an electric vehicle, an output end of the first capacitance compensation module is connected to an input end of a rectification module in the DC/DC module, and the transmitted energy sequentially passes through the first capacitance compensation module, the rectification module in the DC/DC module, a filtering module in the DC/DC module, and the battery module.
optionally, in the hybrid energy modular charging system for an electric vehicle, the first power conversion array includes a plurality of power conversion modules, and the plurality of power conversion modules are all connected to the first dc support capacitor array, where: each power conversion module includes: the power factor correction module comprises an anti-electromagnetic interference module, a power rectification module and a plurality of power factor correction modules.
Optionally, in the hybrid energy modular charging system for an electric vehicle, the second power conversion array includes a plurality of power conversion modules, and the plurality of power conversion modules are all connected to the second dc support capacitor array, where: each power conversion module includes: the power factor correction module comprises an anti-electromagnetic interference module, a power rectification module and a plurality of power factor correction modules.
Optionally, in the hybrid energy modular charging system for the electric vehicle, the number of the power conversion modules is 3, the 3 power conversion modules correspond to phases a, B and C in a three-phase ac power grid, and the ac input lines adopted by the phases a, B and C are L1 and N, L2 and N, L3 and N, respectively.
Optionally, in the hybrid energy modular charging system for electric vehicles,
sampling voltages at two ends of the first direct current support capacitor array, and obtaining a first direct current component and a first alternating current component in the voltages at two ends of the first direct current support capacitor array;
Adjusting the PWM signal of the inversion module to enable the current output by the rectification module to comprise a second direct current component and a second alternating current component;
the first direct current component and the second direct current component have the same direction and the same amplitude; the first alternating current component and the second alternating current component are opposite in direction and equal in amplitude.
In the hybrid energy modular charging system for the electric automobile, the off-board end system is provided with a transmitting end power module for transmitting energy to the on-board end, the on-board end system is provided with a receiving end power module for receiving the energy transmitted by the off-board end system to perform induction charging, the transmission type charging device is also provided with a first power conversion array per se for conducting type charging, so that energy can sequentially flow through the first charging plug, the first power conversion array, the DC/DC module and the battery module for conducting, energy induction transmission can be realized between the transmitting end power module and the receiving end power module and conducted to the battery module, two charging modes of conducting type charging and induction type charging are compatible, the two integrated modes can be configured according to actual conditions, and the problem that the conventional conductive charging system of the electric automobile cannot be compatible with the induction charging system is solved. The conduction charging system and the induction charging system can work independently and can also work together to provide energy for the power battery. Conduction formula charging system maximum transmission power is 20kW, induction type charging system maximum transmission power is 20kW, and the two works together can realize that electric automobile 40kW power charges, has solved under current electric automobile fills slowly and uses, and charging power is lower problem.
Furthermore, the system can carry out power modular configuration, 3 the power conversion module corresponds A looks, B looks and C looks in the three-phase alternating current electric wire netting respectively, can dispose different numbers of phases according to the power demand, and the output power scope is 3.3kW to 40kW, has solved the problem that current electric automobile charging system power can't dispose in a flexible way.
In practical applications, the conduction charging system generally includes a PFC circuit and a DC/DC circuit, i.e., the first power conversion array 12 and the DC/DC module 13. Since the first dc supporting capacitor array 122 in the first power conversion array 12 cannot be infinite, when the AC input voltage becomes 0, the first dc supporting capacitor array 122 is required to provide charging energy, so that the ripple voltage and the ripple current on the first dc supporting capacitor array 122 are large (since the power frequency voltage frequency is 50Hz, and after passing through the power rectification module 124, the ripple frequency is 100Hz), and the ripple voltage affects the magnitude of the output voltage current ripple of the charging system. The voltage at two ends of the first direct current support capacitor array 122 is sampled (the voltage is generally an alternating current component of 20V-30V superimposed on a direct current component of 400V), the direction of the first alternating current component is opposite to that of the second alternating current component, the amplitude is equal, namely, the alternating current component of the sampled voltage is inverted, and then the alternating current component is used as a reference signal, and the reference signal following of the output voltage of the rectifier module 153 is realized by controlling the PWM control of the inverter module 233.
Drawings
FIG. 1 is a schematic diagram of a hybrid energy modular charging system for an electric vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a hybrid energy modular charging system for an electric vehicle according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a hybrid energy modular charging system for an electric vehicle according to another embodiment of the present invention;
Shown in the figure: 10-a vehicle-mounted end system; 11-a first charging plug; 12-a first power conversion array; 121-a power conversion module; 122-a first dc supported capacitor array; 123-anti-electromagnetic interference module; 124-power rectification module; 125-power factor correction module; 13-DC/DC module; 131-a DC/DC middle H-bridge inversion module; a topology compensation module in the 132-DC/DC module; 133-transformer module in DC/DC module; a rectifying module in the 134-DC/DC module; 135-DC/DC module filtering module; 14-a battery module; 15-a receiving end power module; 151-first coil; 152-a first capacitance compensation module; 153-a rectifying module; 16-vehicle end controller; 20-off-board end systems; 21-a second charging plug; 22-a second power conversion array; 221-a power conversion module; 222-a first dc supported capacitive array; 223-an anti-electromagnetic interference module; 224-a power rectification module; 225-power factor correction module; 23-a transmit side power module; 231-a second coil; 232-a second capacitance compensation module; 233-an inverter module; 24-off-board end controller.
Detailed Description
The hybrid energy modular charging system for the electric vehicle according to the present invention is further described in detail with reference to the accompanying drawings and the specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The core idea of the invention is to provide a hybrid energy modular charging system for an electric vehicle, so as to solve the following problems: firstly, the existing conduction type charging system of the electric automobile cannot be compatible with an induction type charging system; secondly, the charging power is low under the current slow charging application of the electric automobile; thirdly, the power of the current electric vehicle charging system cannot be flexibly configured; fourthly, the direct current bus ripple of the current conduction type charging system of the electric automobile is large.
In order to realize the idea, the invention provides a hybrid energy modular charging system for an electric vehicle, which comprises a vehicle-mounted end system and an off-vehicle end system, wherein: the vehicle-mounted end system comprises a first charging plug, a first power conversion array, a DC/DC module, a battery module and a receiving end power module, wherein the first charging plug, the first power conversion array, the DC/DC module and the battery module are sequentially connected, the receiving end power module receives energy transmitted by the off-board end system, and a vehicle-mounted end controller samples and controls energy transmission of each part in the vehicle-mounted end system; the off-board end system comprises a second charging plug, a second power conversion array and a transmitting end power module, wherein the second charging plug and the second power conversion array are sequentially connected, the transmitting end power module transmits energy to the on-board end, and an off-board end controller samples and controls energy transmission of all parts in the off-board end system.
the embodiment provides a hybrid energy modular charging system for an electric vehicle, as shown in fig. 1, the hybrid energy modular charging system for an electric vehicle includes an on-board end system 10 and an off-board end system 20, wherein: the vehicle-mounted end system 10 comprises a first charging plug 11, a first power conversion array 12, a DC/DC module 13 and a battery module 14 which are sequentially connected, and a receiving end power module 15 which receives energy transmitted by the off-board end system, wherein a vehicle-mounted end controller 16 samples and controls energy transmission of each part in the vehicle-mounted end system 10; the off-board end system 20 comprises a second charging plug 21, a second power conversion array 22, a transmitting end power module 23 for transmitting energy to the on-board end, and an off-board end controller 24 for sampling and controlling energy transmission of each part in the off-board end system 20.
The first charging plug 11 and the second charging plug 21 are three-phase four-wire charging plugs (single-phase input/three-phase input is configurable), and have A, B, C three-phase and N-phase input lines, respectively, and the ac input lines for the a-phase, the B-phase, and the C-phase are L1 and N, L2 and N, L3 and N, respectively. The battery module 14 is a high-voltage power battery pack. Fig. 1 shows the energy transmission flow of a hybrid energy modular charging system for an electric vehicle based on hybrid energy transmission mode modularization, the first type is conductive energy flow, which means that a battery module 14 (power battery) is charged completely by a vehicle-mounted end system 10 (conductive charger); the second type is inductive energy flow, which means that the battery module 14 (power battery) is charged completely by the off-board end system 20 (inductive charger or wireless charger); the third method is conductive energy flow plus inductive energy flow, which means that the vehicle-mounted end system 10 (conductive charger) and the non-vehicle-mounted end system 20 (inductive charger or wireless charger) are used together to charge the battery module 14 (power battery), and the charging power is the sum of the two. In the actual application process, the control of the mixed energy flow can be configured according to the specific application scenario and the user requirements.
In the hybrid energy modular charging system for the electric vehicle provided by the embodiment, the off-board system 20 has the transmitting end power module 23 for transferring energy to the on-board end, the on-board system 10 has the receiving end power module 15 for receiving the energy transferred by the off-board system 20 for inductive charging, the self first power conversion array 12 is also arranged for conducting charging, so that energy can flow through the first charging plug 11, the first power conversion array 12, the DC/DC module 13 and the battery module 14 in sequence for conducting, energy induction transmission can be realized between the transmitting end power module 23 and the receiving end power module 15 and conducted to the battery module 14, two charging modes of conducting charging and induction charging are compatible, the two integrated modes can be configured according to actual conditions, and the problem that the conventional conductive charging system of the electric automobile cannot be compatible with the induction charging system is solved. The conduction charging system and the induction charging system can work independently and can also work together to provide energy for the power battery. Conduction formula charging system maximum transmission power is 20kW, induction type charging system maximum transmission power is 20kW, and the two works together can realize that electric automobile 40kW power charges, has solved under current electric automobile fills slowly and uses, and charging power is lower problem.
specifically, in the hybrid energy modular charging system for the electric vehicle, the receiving end power module 15 includes a first coil 151, a first capacitance compensation module 152 and a rectification module 153, and the transmitting end power module 23 includes a second coil 231, a second capacitance compensation module 232 and an inversion module 233.
Further, as shown in fig. 1-2, in the inductive charging mode, there are three energy transmission paths, and a common transmission path of the three energy transmission paths includes: the output end of the second power conversion array 22 is connected to the inverter module 233, the inverter module 233 is connected to the second capacitance compensation module 232, the second capacitance compensation module 232 is connected to the second coil 231, the second coil 231 is coupled to the first coil 151, and the first coil 151 is connected to the first capacitance compensation module 152; according to the transmission path, the transmitted energy sequentially passes through the second power conversion array 22, the inverter module 233, the second capacitance compensation module 232, the second coil 231, the first coil 151, and the first capacitance compensation module 152.
The first transmission path is as follows: as shown in fig. 1, an output terminal of the first capacitance compensation module 152 is connected to an input terminal of the rectification module 153, and an output terminal of the rectification module 153 is connected to an input terminal of the DC/DC module 13; the transferred energy passes through the first capacitance compensation module 152, the rectification module 153, the DC/DC module 13, and the battery module 14 in sequence according to the transmission path.
after passing through the first capacitance compensation module 152 (hereinafter, referred to as "receiving-end capacitance compensation module") and the rectification module 153, the first coil 151 (hereinafter, referred to as "receiving-end magnetic energy coil") of the "inductive charging system" (including the off-board system 20 and the receiving-end power module 15) is connected to an output end of the first power conversion array 12 (hereinafter, referred to as "PFC array 1") in the "conductive charging system" (including the first charging plug 11 and the first power conversion array 12 in the on-board system 10), that is, an input end of the DC/DC module 13 (hereinafter, referred to as "DC/DC module"). As shown in fig. 1, in this scheme, the inductive charging system needs to provide a stable and controllable DC output voltage source to supply energy to the DC/DC module together with the PFC array 1, and since the inductive charging path includes three portions, namely, the second power conversion array 22 (hereinafter, referred to as "PFC array 2"), the first coil and second coil coupling portion, and the DC/DC module portion, the efficiency of the inductive charging system is low.
The second transmission path is as follows: as shown in fig. 2, the DC/DC module 13 includes an H-bridge inverter module 131 in the DC/DC module, a topology compensation module 132 in the DC/DC module, a transformer module 133 in the DC/DC module, a rectifier module 134 in the DC/DC module, and a filter module 135 in the DC/DC module, which are connected in sequence, and an output end of the filter module 135 in the DC/DC module is connected to an input end of the battery module 14. The output end of the first capacitance compensation module 152 is connected to the input end of the rectification module 153, and the output end of the rectification module 153 is connected to the input end of the filtering module 135; the transferred energy passes through the first capacitance compensation module 152, the rectification module 153, the filtering module 135 in the DC/DC module, and the battery module 14 in sequence according to the transmission path.
Fig. 2 to 3 are diagrams in which the DC/DC module is subdivided into an H bridge inverter module 131 in the DC/DC module, a topology compensation module 132 in the DC/DC module, a transformer module 133 in the DC/DC module, a rectifier module 134 in the DC/DC module, and a filter module 135 in the DC/DC module (hereinafter, referred to as "H bridge module", "topology compensation module", "transformer module", "rectifier bridge module", and "filter module" for short, respectively), and each of the above modules is n, and can be flexibly configured according to power requirements. After passing through the receiving end capacitance compensation module and the full-bridge rectification module, the magnetic energy coil at the receiving end of the inductive charging system is connected to the output end of a rectifier bridge module in the DC/DC module, namely the input end of a filter module in the DC/DC module, as shown in FIG. 2, the conductive charging system and the inductive charging system share the filter module in the DC/DC module.
The third transmission path is as follows: the output end of the first capacitance compensation module 152 is connected to the input end of the rectification module 134 in the DC/DC module, and the following path structure is the same as the second transmission path; the transferred energy passes through the first capacitance compensation module 152, the rectifying module 134 in the DC/DC module, the filtering module 135 in the DC/DC module, and the battery module 14 in sequence according to the transmission path.
After passing through the receiving end capacitance compensation module, the magnetic energy coil at the receiving end of the inductive charging system is directly connected to the output end of the transformer module 133 in the DC/DC module, i.e. the input end of the rectifier module 134 in the DC/DC module, as shown in fig. 3, the conductive charging system and the inductive charging system share the rectifier bridge module in the DC/DC module and the filter module in the DC/DC module.
the three transmission paths and the energy transmission loops corresponding to the transmission paths respectively explain the integration modes of the conduction type charging system and the induction type charging system, provide a compatibility scheme of the conduction type charging system and the induction type charging system, realize the compatibility of the conduction type charging mode and the induction type charging mode, and configure the integration modes of the conduction type charging system and the induction type charging system according to actual conditions.
Further, as shown in fig. 1, in the hybrid energy modular charging system of the electric vehicle, the first power conversion array 12 includes a plurality of power conversion modules 121, and the plurality of power conversion modules 121 are all connected to the first dc support capacitor array 122, where: each power conversion module 121 includes: an anti-electromagnetic interference module 123, a power rectification module 124 and a plurality of power factor correction modules 125.
The EMI module 123 is an EM1 filter, and a standard EMI filter is a low-pass filter circuit generally composed of a series reactor and a parallel capacitor, and functions to allow a frequency signal of the device in normal operation to enter the device, but has a large blocking effect on a high-frequency interference signal. The power line is a main way for interfering the incoming device and the outgoing device, the interference of the power grid can be transmitted into the device through the power line to interfere the normal operation of the device, and the interference generated by the device can also be transmitted to the power grid through the power line to interfere the normal operation of other devices. EMI filters must be added at the power inlet of the device. The EMI filter is a low-pass filter composed of an inductor and a capacitor, and can allow low-frequency useful signals to pass through smoothly, and has a function of inhibiting high-frequency interference. The EMI filter mainly has the following two functions: suppressing high-frequency interference, and suppressing the influence of the high-frequency interference in an alternating current power grid on equipment; the interference of equipment (especially a high-frequency switching power supply) to an alternating current power grid is suppressed.
Similarly, in the hybrid energy modular charging system of the electric vehicle, the second power conversion array 22 includes a plurality of power conversion modules 221, and the plurality of power conversion modules 221 are all connected to the second dc support capacitor array 222, where: each power conversion module 221 includes: an anti-electromagnetic interference module 223, a power rectification module 224 and a plurality of power factor correction modules 225.
Specifically, in the electric vehicle hybrid energy modular charging system, the number of the power conversion modules 121 of the first power conversion array 12 is 3, the number of the power conversion modules 221 of the second power conversion array 22 is also 3, the 3 power conversion modules correspond to the a phase, the B phase and the C phase in the three-phase ac power grid, the ac input lines adopted by the a phase, the B phase and the C phase are L1, N, L2 and N, L3 and N, respectively, that is, the 3 power conversion modules 121 of the first power conversion array 12 correspond to the a phase, the B phase and the C phase in the first charging plug 11, and the 3 power conversion modules 221 of the second power conversion array 22 correspond to the a phase, the B phase and the C phase in the second charging plug 12, respectively.
Furthermore, the system can be configured in a power modularization mode, 3 power conversion modules respectively correspond to the phase A, the phase B and the phase C in the three-phase alternating-current power grid, different phase numbers can be configured according to power requirements, and the output power range is 3.3kW to 40 kW.
The electric vehicle modular charging system based on the hybrid energy transmission mode shown in fig. 1 can be configured modularly according to actual application scenarios and user habits, so as to meet actual charging power requirements of electric vehicles. In fig. 1, the PFC array 1 and the PFC array 2 both adopt an independent single-phase PFC combination strategy, and if an application scenario and a user only have a charging power requirement of 3.3kW or 6.6kW, only an a-phase, B-phase, or C-phase power factor correction module (hereinafter, referred to as a "PFC module") is configured; if the application scene and the user only have the charging power requirements which are more than 6.6kW and less than 13.2kW, any two PFC modules in the phase A, the phase B and the phase C are configured; if the application scene and the user have the charging power requirements of more than 13.2kW and less than 20kW, the three-phase power factor correction function is completed through the A-phase PFC module, the B-phase PFC module and the C-phase PFC module together. When only the conductive energy flow or the inductive energy flow in fig. 2 is considered, the DC/DC module may be configured according to the output power of the PFC array 1 or the PFC array 2, and the maximum value is less than 20 kW; when considering the conductive energy flow plus the inductive energy flow in fig. 2, the DC/DC module needs to be configured according to the sum of the output powers of the PFC array 1 and the PFC array 2, and the maximum value is less than 40 kW.
In summary, the modular configuration can flexibly meet the requirements of different application scenarios and user habits on charging power, the system can perform power modular configuration, 3 power conversion modules respectively correspond to the phase a, the phase B and the phase C in the three-phase ac power grid, different phases can be configured according to the power requirements, and the output power range is 3.3kW to 40 kW.
in the hybrid energy modular charging system for the electric automobile, the off-board end system is provided with a transmitting end power module for transmitting energy to the on-board end, the on-board end system is provided with a receiving end power module for receiving the energy transmitted by the off-board end system to perform induction charging, the transmission type charging device is also provided with a first power conversion array per se for conducting type charging, so that energy can sequentially flow through the first charging plug, the first power conversion array, the DC/DC module and the battery module for conducting, energy induction transmission can be realized between the transmitting end power module and the receiving end power module and conducted to the battery module, two charging modes of conducting type charging and induction type charging are compatible, the two integrated modes can be configured according to actual conditions, and the problem that the conventional conductive charging system of the electric automobile cannot be compatible with the induction charging system is solved. The conduction charging system and the induction charging system can work independently and can also work together to provide energy for the power battery. Conduction formula charging system maximum transmission power is 20kW, induction type charging system maximum transmission power is 20kW, and the two works together can realize that electric automobile 40kW power charges, has solved under current electric automobile fills slowly and uses, and charging power is lower problem.
Furthermore, the system can carry out power modular configuration, 3 the power conversion module corresponds A looks, B looks and C looks in the three-phase alternating current electric wire netting respectively, can dispose different numbers of phases according to the power demand, and the output power scope is 3.3kW to 40kW, has solved the problem that current electric automobile charging system power can't dispose in a flexible way.
In addition, in the electric vehicle hybrid energy modular charging system, the voltages at two ends of the first direct current support capacitor array are sampled, and a first direct current component and a first alternating current component in the voltages at two ends of the first direct current support capacitor array are obtained; adjusting the PWM signal of the inversion module to enable the current output by the rectification module to comprise a second direct current component and a second alternating current component; the first direct current component and the second direct current component have the same direction and the same amplitude; the first alternating current component and the second alternating current component are opposite in direction and equal in amplitude.
In practical applications, the conduction charging system generally includes a PFC circuit and a DC/DC circuit, i.e., the first power conversion array 12 and the DC/DC module 13. Since the first dc supporting capacitor array 122 in the first power conversion array 12 cannot be infinite, when the AC input voltage becomes 0, the first dc supporting capacitor array 122 is required to provide charging energy, so that the ripple voltage and the ripple current on the first dc supporting capacitor array 122 are large (since the power frequency voltage frequency is 50Hz, and after passing through the power rectification module 124, the ripple frequency is 100Hz), and the ripple voltage affects the magnitude of the output voltage current ripple of the charging system. The voltage at two ends of the first direct current support capacitor array 122 is sampled (the voltage is generally an alternating current component of 20V-30V superimposed on a direct current component of 400V), the direction of the first alternating current component is opposite to that of the second alternating current component, the amplitude is equal, namely, the alternating current component of the sampled voltage is inverted, and then the alternating current component is used as a reference signal, and the reference signal following of the output voltage of the rectifier module 153 is realized by controlling the PWM control of the inverter module 233.
In summary, the above embodiments describe in detail different configurations of the hybrid energy modular charging system for the electric vehicle, and it goes without saying that the present invention includes but is not limited to the configurations listed in the above embodiments, and any modifications based on the configurations provided in the above embodiments are within the scope of the present invention. One skilled in the art can take the contents of the above embodiments to take a counter-measure.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (11)
1. The utility model provides an electric automobile hybrid energy modularization charging system, its characterized in that, electric automobile hybrid energy modularization charging system includes on-vehicle end system and off-vehicle end system, wherein:
The vehicle-mounted end system comprises a first charging plug, a first power conversion array, a DC/DC module, a battery module and a receiving end power module, wherein the first charging plug, the first power conversion array, the DC/DC module and the battery module are sequentially connected, the receiving end power module receives energy transmitted by the off-board end system, and a vehicle-mounted end controller samples and controls energy transmission of each part in the vehicle-mounted end system;
The off-board end system comprises a second charging plug, a second power conversion array and a transmitting end power module, wherein the second charging plug and the second power conversion array are sequentially connected, the transmitting end power module transmits energy to the on-board end, and an off-board end controller samples and controls energy transmission of all parts in the off-board end system.
2. The modular charging system for hybrid energy of electric vehicles of claim 1, wherein the receiving end power module comprises a first coil, a first capacitance compensation module and a rectification module, and the transmitting end power module comprises a second coil, a second capacitance compensation module and an inversion module.
3. The hybrid energy modular charging system for the electric vehicle as claimed in claim 2, wherein the output end of the second power conversion array is connected to the inverter module, the inverter module is connected to the second capacitance compensation module, the second capacitance compensation module is connected to the second coil, the second coil is coupled to the first coil, and the first coil is connected to the first capacitance compensation module; the transmitted energy sequentially passes through the second power conversion array, the inversion module, the second capacitance compensation module, the second coil, the first coil and the first capacitance compensation module.
4. The hybrid energy modular charging system for electric vehicles according to claim 3, wherein the output terminal of the first capacitance compensation module is connected to the input terminal of the rectification module, and the output terminal of the rectification module is connected to the input terminal of the DC/DC module; the transmitted energy sequentially passes through the first capacitance compensation module, the rectification module, the DC/DC module and the battery module.
5. The modular charging system for hybrid energy of electric vehicles according to claim 3, wherein the DC/DC module comprises an H-bridge inverter module in the DC/DC module, a topology compensation module in the DC/DC module, a transformer module in the DC/DC module, a rectification module in the DC/DC module and a filtering module in the DC/DC module, which are connected in sequence, and the output end of the filtering module in the DC/DC module is connected with the input end of the battery module.
6. The hybrid energy modular charging system of claim 5, wherein the output terminal of the first capacitance compensation module is connected to the input terminal of the rectification module, the output terminal of the rectification module is connected to the input terminal of the filtering module of the DC/DC module, and the transmitted energy passes through the first capacitance compensation module, the rectification module, the filtering module of the DC/DC module and the battery module in sequence.
7. The hybrid energy modular charging system of claim 5, wherein the output terminal of the first capacitive compensation module is connected to the input terminal of the rectifying module of the DC/DC module, and the transmitted energy passes through the first capacitive compensation module, the rectifying module of the DC/DC module, the filtering module of the DC/DC module and the battery module in sequence.
8. the modular energy charging system of claim 1 wherein the first power conversion array comprises a plurality of power conversion modules, each of the plurality of power conversion modules being connected to a first dc-supported capacitor array, wherein: each power conversion module includes: the power factor correction module comprises an anti-electromagnetic interference module, a power rectification module and a plurality of power factor correction modules.
9. The modular hybrid energy charging system of claim 1 wherein the second power conversion array comprises a plurality of power conversion modules, each of the plurality of power conversion modules being connected to a second dc support capacitor array, wherein: each power conversion module includes: the power factor correction module comprises an anti-electromagnetic interference module, a power rectification module and a plurality of power factor correction modules.
10. the hybrid energy modular charging system for electric vehicles of claim 8 or 9, wherein the number of the power conversion modules is 3, 3 power conversion modules correspond to phases a, B and C in a three-phase ac power grid, and ac input lines adopted by the phases a, B and C are respectively L1 and N, L2 and N, L3 and N.
11. The modular hybrid energy charging system for electric vehicles of claim 8,
Sampling voltages at two ends of the first direct current support capacitor array, and obtaining a first direct current component and a first alternating current component in the voltages at two ends of the first direct current support capacitor array;
Adjusting the PWM signal of the inversion module to enable the current output by the rectification module to comprise a second direct current component and a second alternating current component;
The first direct current component and the second direct current component have the same direction and the same amplitude; the first alternating current component and the second alternating current component are opposite in direction and equal in amplitude.
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Application publication date: 20191210 |