CN105375554A - Electric automobile direct-current charging pile system - Google Patents

Electric automobile direct-current charging pile system Download PDF

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Publication number
CN105375554A
CN105375554A CN201510662004.0A CN201510662004A CN105375554A CN 105375554 A CN105375554 A CN 105375554A CN 201510662004 A CN201510662004 A CN 201510662004A CN 105375554 A CN105375554 A CN 105375554A
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unit
switch
charging
node
connects
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CN201510662004.0A
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愈先梅
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愈先梅
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Priority to CN201510662004.0A priority Critical patent/CN105375554A/en
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Abstract

The invention discloses an electric automobile direct-current charging pile system. The electric automobile direct-current charging pile system comprises a centralized AC/DC conversion unit, a first direct-current bus, four DC/DC units and four charging cases. An input end of the centralized AC/DC conversion unit is connected with a power grid, and an output end is connected with the first direct-current bus. An input end of each DC/DC unit is connected with the first direct-current bus, and output ends of the DC/DC units are connected with input ends of the charging cases. The electric automobile direct-current charging pile system further comprises a plurality of switch units, a second direct-current bus, a temperature sensor, a current sensor, a voltage sensor and a controller unit. The whole system is easily controlled, the electric power consumption of the whole system is relatively low, and the system is more energy-saving.

Description

Electric automobile direct-current charging post system
Technical field
The present invention relates to electric vehicle engineering field, particularly a kind of electric automobile direct-current charging post system.
Background technology
Electric automobile take vehicle power as power, with the vehicles of motor as a kind of new green environment protection of power drive wheels travel.The vehicle power of electric automobile generally carries out serial or parallel connection by plurality of groups of storage batteries and is arranged in a combination, and improves the power supply capacity of storage battery with this.Electric automobile is due to less relative to orthodox car to environmental impact, and its prospect is extensively had an optimistic view of.The most widely used power supply of electric automobile is lead acid accumulator, but along with the development of electric vehicle engineering, lead acid accumulator due to energy low, charging rate is slow, and the life-span is short, gradually replace by other storage batterys.The power supply developed mainly contains sodium-sulphur battery, nickel-cadmium cell, lithium battery, fuel cell etc., and the application of these novel power supplies, the development for electric automobile opens wide prospect.The effect of drive motor is mechanical energy by the electric energy conversion of power supply, by transmission device or direct drive of wheel and equipment.
Electric automobile charging pile (station) refers to the website into charging electric vehicle, similar to present gas station.Along with low-carbon economy becomes the theme of China's economic development, electric automobile charging station is as new forms of energy strategy and the important component part of intelligent grid, one of and the emerging strategic industries determined of State Council, the emphasis of Chinese Automobile Industry ' and energy industry development from now on will be become.
As shown in Figure 1, existing electric automobile charging station major part is given rechargeable battery powered by AC/DC convert charging device, the charging voltage size of each AC/DC convert charging device is controlled by control system, because a charging station generally has tens charge position, therefore control system controls very complicated.
As shown in Figure 2, centralized device for converting electric energy is adopted to flow to DC bus by disposable for electrical network electric energy, then DC bus connects multiple DC/DC conversion equipment, be respectively rechargeable battery charging (storage battery), such charging station system controls relatively simple relative to control system the first charging system for electric automobile.
Storage battery is in charging process, in order to shorten the charging interval, time incipient, charging current and charging voltage are all larger, the prolongation in charging interval at any time, the temperature of storage battery can constantly rise, if continue the charging voltage and the charging current that adopt beginning, the life-span of storage battery will reduce greatly; So there is the charging system for electric automobile that charging voltage constantly changes, the technical scheme gathered is exactly the output voltage size constantly regulating DC/DC converting unit, control system is needed constantly to control multiple DC/DC converting unit, the complexity of whole like this control system is higher, owing to needing the conducting turn-off time constantly changing thyristor, make whole system power consumption larger.
Summary of the invention
The technical problem to be solved in the present invention is: what background technology part described needs constantly to regulate the control program complexity of DC/DC switching cell output voltages size higher to extend the rechargeable battery life-span, and the conducting control time changing thyristor frequently consumes energy more.
In order to solve above technical problem, technical scheme of the present invention is as follows: electric automobile direct-current charging post system, comprise centralized AC DC converting unit, the first DC bus, 4 DC/DC unit, 4 charging cases; Centralized AC DC converting unit input connect electrical network, output connects the first DC bus, the input of each DC/DC unit connects the first DC bus; The output of DC/DC unit connects the input of charging case; It is characterized in that, also comprise multiple switch element, the second DC bus, temperature sensor, current sensor, voltage sensor, controller unit;
4 DC/DC unit are by left-to-right called after successively the one DC/DC unit, the 2nd DC/DC unit, the 3rd DC/DC unit, the 4th DC/DC unit;
4 charging cases are by left-to-right called after successively first charging case, the second charging case, the 3rd charging case, the 4th charging case;
The output voltage of the one DC/DC unit, the 2nd DC/DC unit is 1200V;
The output voltage of the 3rd DC/DC unit is 800V;
The output voltage of the 4th DC/DC unit is 600V;
Connect between the output of the one DC/DC unit and the input of the first charging case two switch elements, the connected node between these two switch elements is defined as first node;
Connect between the output of the 2nd DC/DC unit and the input of the second charging case two switch elements, the connected node between these two switch elements is defined as Section Point;
Connect between the output of the 3rd DC/DC unit and the input of the 3rd charging case two switch elements, the connected node between these two switch elements is defined as the 3rd node;
Connect between the output of the 4th DC/DC unit and the input of the 4th charging case two switch elements, the connected node between these two switch elements is defined as the 4th node;
First node connects one end of a switch element, and the other end of this switch element connects the second DC bus;
Section Point connects one end of a switch element, and the other end of this switch element connects the second DC bus;
3rd node connects one end of a switch element, and the other end of this switch element connects the second DC bus;
4th node connects one end of a switch element, and the other end of this switch element connects the second DC bus;
Temperature sensor detects the temperature of rechargeable battery;
Current sensor, voltage sensor are all arranged at the input port place of charging case;
Current sensor, voltage sensor detect charging current and the charging voltage of each rechargeable battery respectively;
Temperature sensor, current sensor, voltage sensor are electrically connected with controller unit;
The control end of each switch element is electrically connected with the I/O port of controller unit respectively;
Controller unit controls the disconnection of each switch element with closed by the control end of control switch unit.
Further, described controller unit adopts MSP430 single-chip microcomputer.
Further, described switch element adopts controlled thyristor.
Compared with prior art, beneficial effect of the present invention: first, the present invention is by detecting temperature, charging current, the charging voltage of rechargeable battery, thus adjust charging voltage, charging current in time, just charging voltage and the charging current of rechargeable battery is changed by the control end of control switch unit due to controller unit, instead of by constantly changing the output voltage of DC/DC converting unit, so whole system to control very simple, the second, owing to being by the closed of control switch unit and turning off, and do not need the conducting control time constantly changing thyristor, so the power consumption of whole system is lower, more energy-conservation, 3rd, the output voltage of DC/DC converting unit of the present invention is changeless, therefore control very simple, in order to the present invention in useful life extending charge in batteries can realize following scheme, such as give the words of the 4th charging case charging, a DC/DC unit and the parallel connection of the 2nd DC/DC unit can be adopted at first, the 3rd DC/DC unit charging can be adopted after charging a period of time, finally can adopt the 4th DC/DC unit charging, the DC/DC unit of other charge position just can be allowed to be the 4th charging case charging when not needing the storage battery moving the 4th charging case inside, 4th, circuit design of the present invention can simple realization charged in parallel, 5th, the benefit that the present invention arranges the second DC bus is, such as, 2nd DC/DC unit is that the 4th charging case charging only needs the switch element between Section Point and the second DC bus to close, switch element between 3rd node and the second DC bus disconnects, switch element between first node and the second DC bus disconnects, if at this time the 3rd DC/DC unit bio-occlusion the 3rd charging case charging, DC/DC unit bio-occlusion first charging case charges and can not be affected.
Accompanying drawing explanation
Fig. 1 is existing a kind of charging system for electric automobile principle block diagram;
Fig. 2 is existing another kind of charging system for electric automobile principle block diagram;
Fig. 3 is principle block diagram of the present invention;
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Illustrate: DC/DC unit is that AC-DC conversion device belongs to existing known technology and is not described in detail.MSP430 series monolithic is the single-chip microcomputer of 16, have employed Reduced Instruction Set Computer Architecture, and why MSP430 single-chip microcomputer has ultralow power consumption, is because it has its distinctive feature in the supply voltage reducing chip and flexible and controlled operation clock.
For 4 DC/DC unit by left-to-right called after successively the one DC/DC unit, the 2nd DC/DC unit, the 3rd DC/DC unit, the 4th DC/DC unit; 4 charging cases are by left-to-right called after successively first charging case, the second charging case, the 3rd charging case, the 4th charging case; Just convenient in order to describe, in actual implementation process, do not exist so-called by left-to-right position relationship.
As shown in Figure 3: electric automobile direct-current charging post system, comprise centralized AC DC converting unit, the first DC bus, 4 DC/DC unit, 4 charging cases; Centralized AC DC converting unit input connect electrical network, output connects the first DC bus, the input of each DC/DC unit connects the first DC bus; The output of DC/DC unit connects the input of charging case; Also comprise multiple switch element, the second DC bus, temperature sensor, current sensor, voltage sensor, controller unit;
4 DC/DC unit are by left-to-right called after successively the one DC/DC unit, the 2nd DC/DC unit, the 3rd DC/DC unit, the 4th DC/DC unit;
4 charging cases are by left-to-right called after successively first charging case, the second charging case, the 3rd charging case, the 4th charging case;
The output voltage of the one DC/DC unit, the 2nd DC/DC unit is 1200V;
The output voltage of the 3rd DC/DC unit is 800V;
The output voltage of the 4th DC/DC unit is 600V;
Connect between the output of the one DC/DC unit and the input of the first charging case two switch elements, the connected node between these two switch elements is defined as first node;
Connect between the output of the 2nd DC/DC unit and the input of the second charging case two switch elements, the connected node between these two switch elements is defined as Section Point;
Connect between the output of the 3rd DC/DC unit and the input of the 3rd charging case two switch elements, the connected node between these two switch elements is defined as the 3rd node;
Connect between the output of the 4th DC/DC unit and the input of the 4th charging case two switch elements, the connected node between these two switch elements is defined as the 4th node;
First node connects one end of a switch element, and the other end of this switch element connects the second DC bus;
Section Point connects one end of a switch element, and the other end of this switch element connects the second DC bus;
3rd node connects one end of a switch element, and the other end of this switch element connects the second DC bus;
4th node connects one end of a switch element, and the other end of this switch element connects the second DC bus;
Temperature sensor detects the temperature of rechargeable battery; Current sensor, voltage sensor are all arranged at the input port place of charging case; Current sensor, voltage sensor detect charging current and the charging voltage of each rechargeable battery respectively; Temperature sensor, current sensor, voltage sensor are electrically connected with controller unit; The control end of each switch element is electrically connected with the I/O port of controller unit respectively; Controller unit controls the disconnection of each switch element with closed by the control end of control switch unit.
Wherein, controller unit adopts MSP430 single-chip microcomputer, and switch element adopts controlled thyristor.
The concrete control method principle of embodiment:
The first step, if namely the 4th charging case will be a rechargeable battery charging, current charging interval 0, detected temperatures 15 degree; At this moment can adopt high voltage, large current charge, adopt two DC/DC unit parallel connections exporting 1200V to charge,
Those two switch elements that controller unit controls closed first node, Section Point connects the second DC bus respectively; Disconnect the switch element below first node, Section Point; Disconnect that switch element that the 3rd node is connected with the second DC bus; Closed 4th node connects that switch element of the second DC bus, disconnects that switch element above the 4th node;
Second step, supposes to charge 30 minutes, and detected temperatures is 28 degree; At this moment can adopt the DC/DC unit charging exporting 800V, at this moment can disconnect first node, switch element that Section Point is connected with the second DC bus, close the 3rd node, switch element that the 4th node is connected with the second DC bus; The specifically closed and disconnection of other switch element and the similar of the first step.
3rd step, supposes charging 50 minutes, and detected temperatures is 30; Can employing the 4th DC/DC unit be only at this time the rechargeable battery charging in the 4th charging case.
Electrical connection between DC/DC unit of the present invention and charging case can be very easy to realize following demand: storage battery is in charging process, in order to shorten the charging interval, time incipient, charging current and charging voltage need all larger, the prolongation in charging interval at any time, the temperature of storage battery can constantly rise, at this moment adopt medium voltage, current charges, when waiting the temperature of storage battery to rise to higher, adopt low voltage, current charges.Electrical connection between DC/DC unit of the present invention and charging case can be easy to realize several DC/DC unit charged in parallel, really achieves that charging voltage is variable, charging current is variable but controls the target simple, system energy consumption is low simultaneously.
Above control method is an example, and the present invention merely provides a kind of electric automobile direct-current charging post system, and the control method that this system is concrete can adjust according to actual conditions.
Present system by detecting the temperature of rechargeable battery, charging current, charging voltage adjust charging voltage in time, substantially prolongs the life-span of storage battery, make charging safer; Because controller unit is by control switch unit thus the charging voltage of change rechargeable battery and charging current, instead of change charging voltage by the output voltage size that changes DC/DC unit, so whole system of the present invention controls very simple, more energy-conservation.

Claims (2)

1. electric automobile direct-current charging post system, comprise centralized AC DC converting unit, the first DC bus, 4 DC/DC unit, 4 charging cases; Centralized AC DC converting unit input connect electrical network, output connects the first DC bus, the input of each DC/DC unit connects the first DC bus; The output of DC/DC unit connects the input of charging case; It is characterized in that, also comprise multiple switch element, the second DC bus, temperature sensor, current sensor, voltage sensor, controller unit;
4 DC/DC unit are by left-to-right called after successively the one DC/DC unit, the 2nd DC/DC unit, the 3rd DC/DC unit, the 4th DC/DC unit;
4 charging cases are by left-to-right called after successively first charging case, the second charging case, the 3rd charging case, the 4th charging case;
The output voltage of the one DC/DC unit, the 2nd DC/DC unit is 1200V;
The output voltage of the 3rd DC/DC unit is 800V;
The output voltage of the 4th DC/DC unit is 600V;
Connect between the output of the one DC/DC unit and the input of the first charging case two switch elements, the connected node between these two switch elements is defined as first node;
Connect between the output of the 2nd DC/DC unit and the input of the second charging case two switch elements, the connected node between these two switch elements is defined as Section Point;
Connect between the output of the 3rd DC/DC unit and the input of the 3rd charging case two switch elements, the connected node between these two switch elements is defined as the 3rd node;
Connect between the output of the 4th DC/DC unit and the input of the 4th charging case two switch elements, the connected node between these two switch elements is defined as the 4th node;
First node connects one end of a switch element, and the other end of this switch element connects the second DC bus;
Section Point connects one end of a switch element, and the other end of this switch element connects the second DC bus;
3rd node connects one end of a switch element, and the other end of this switch element connects the second DC bus;
4th node connects one end of a switch element, and the other end of this switch element connects the second DC bus;
Temperature sensor detects the temperature of rechargeable battery;
Current sensor, voltage sensor are all arranged at the input port place of charging case;
Current sensor, voltage sensor detect charging current and the charging voltage of each rechargeable battery respectively;
Temperature sensor, current sensor, voltage sensor are electrically connected with controller unit;
The control end of each switch element is electrically connected with the I/O port of controller unit respectively;
Controller unit controls the disconnection of each switch element with closed by the control end of control switch unit.
2. electric automobile direct-current charging post system according to claim 1, is characterized in that: described controller unit adopts MSP430 single-chip microcomputer; Described switch element adopts controlled thyristor.
CN201510662004.0A 2015-10-10 2015-10-10 Electric automobile direct-current charging pile system Pending CN105375554A (en)

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Application Number Priority Date Filing Date Title
CN201510662004.0A CN105375554A (en) 2015-10-10 2015-10-10 Electric automobile direct-current charging pile system

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Application Number Priority Date Filing Date Title
CN201510662004.0A CN105375554A (en) 2015-10-10 2015-10-10 Electric automobile direct-current charging pile system

Publications (1)

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CN105375554A true CN105375554A (en) 2016-03-02

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202206160U (en) * 2011-09-09 2012-04-25 南京泰春电子有限公司 Charging device of electric automobiles
CN103633717A (en) * 2012-08-24 2014-03-12 国家电网公司 Charging system of electric car charging station
CN103828181A (en) * 2011-09-02 2014-05-28 特斯拉汽车公司 Multiport vehicle DC charging system with variable power distribution
CN104079052A (en) * 2014-07-04 2014-10-01 国家电网公司 Direct-current charging system of electric automobile
CN203967811U (en) * 2014-07-04 2014-11-26 国家电网公司 Electric automobile DC charging system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103828181A (en) * 2011-09-02 2014-05-28 特斯拉汽车公司 Multiport vehicle DC charging system with variable power distribution
CN202206160U (en) * 2011-09-09 2012-04-25 南京泰春电子有限公司 Charging device of electric automobiles
CN103633717A (en) * 2012-08-24 2014-03-12 国家电网公司 Charging system of electric car charging station
CN104079052A (en) * 2014-07-04 2014-10-01 国家电网公司 Direct-current charging system of electric automobile
CN203967811U (en) * 2014-07-04 2014-11-26 国家电网公司 Electric automobile DC charging system

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Application publication date: 20160302