CN102651562B - A kind of electric vehicle DC electric power system - Google Patents
A kind of electric vehicle DC electric power system Download PDFInfo
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- CN102651562B CN102651562B CN201110045970.XA CN201110045970A CN102651562B CN 102651562 B CN102651562 B CN 102651562B CN 201110045970 A CN201110045970 A CN 201110045970A CN 102651562 B CN102651562 B CN 102651562B
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Abstract
The invention provides a kind of electric vehicle DC electric power system, comprise electrokinetic cell, DC-DC module, storage battery, auxiliary power module, control module, load and the first switch, described electrokinetic cell is connected with storage battery with load respectively by DC-DC module, storage battery is connected with auxiliary power module one end by the first switch, the other end of auxiliary power module is connected with control module with DC-DC module respectively, described control module is connected with DC-DC module, wherein said control module is for receiving starting command, and according to the voltage of electrokinetic cell, it is load and storage battery power supply by DC-DC module that the output voltage electric current of DC-DC module and loading demand control electrokinetic cell, overcome the high and technical problem that cost is high of existing electric vehicle DC electric power system energy consumption, the present invention has the low and advantage that energy consumption is low of cost.
Description
Technical field
The invention belongs to electric motor car for electrical domain, be specifically related to a kind of electric vehicle DC electric power system.
Background technology
Existing electric vehicle DC electric power system as shown in Figure 1, comprise electrokinetic cell 11, DC-DC module 12, storage battery 16, auxiliary power module 14, control module 13 and load 15, wherein electrokinetic cell 11 is connected with storage battery 16 with load 15 respectively by DC-DC module 12, described electrokinetic cell 11 is connected with DC-DC module 12 with control module 13 respectively by auxiliary power module 14, power for giving control module 13 and DC-DC module 12, described control module 13 is connected with DC-DC module 12, for receiving starting command, and according to the voltage of electrokinetic cell 11, the output voltage electric current of DC-DC module 12 and load 15 demand modeling electrokinetic cell 11 are load 15 and storage battery power supply by DC-DC module 12.Although this electric vehicle DC electric power system can realize the real-time power supply of load, but there is following shortcoming: 1) when DC-DC module output current is lower, when namely there is underloading situation, the lagging leg of DC-DC module cannot realize resonance, thus increase stress and the loss of DC-DC module, namely reduce DC-DC module inefficiency, reliability and life cycle; 2) auxiliary power module is connected with electrokinetic cell, due to the overtension of electrokinetic cell, thus causes the hardware requirement of auxiliary power module higher, namely adds hardware cost; 3) no matter whether system is in running order, and electrokinetic cell is powered for auxiliary power module always, causes energy waste.
Summary of the invention
The present invention solves the high and technical problem that cost is high of existing electric vehicle DC electric power system energy consumption, provides the low and electric vehicle DC electric power system that energy consumption is low of a kind of cost.
Technical scheme of the present invention is:
A kind of electric vehicle DC electric power system, comprise electrokinetic cell, DC-DC module, storage battery, auxiliary power module, control module and load, wherein also comprise the first switch, described electrokinetic cell is connected with storage battery with load respectively by DC-DC module, storage battery is connected with auxiliary power module one end by the first switch, the other end of auxiliary power module is connected with control module with DC-DC module respectively, and described control module is connected with DC-DC module, wherein
Described control module is for receiving starting command, and to control electrokinetic cell according to the voltage of electrokinetic cell, the output voltage electric current of DC-DC module and loading demand be load and storage battery power supply by DC-DC module.
Further, when the first switch closes, storage battery is respectively control module by auxiliary power module and DC-DC module is powered, and after control module receives starting command, controlling electrokinetic cell by DC-DC module according to the voltage of electrokinetic cell, the output voltage electric current of DC-DC module and loading demand is load and storage battery power supply;
When the first switch disconnects, storage battery stops powering for control module and DC-DC module, and electric vehicle DC electric power system stops.
Further, electric vehicle DC electric power system also comprises second switch, and this second switch is connected between auxiliary power module and DC-DC module.
Further, when the first switch closes, storage battery is respectively after control module and DC-DC module power by auxiliary power module, described control module is also for judging whether electric vehicle DC electric power system is in light condition, when DC-DC module output current lower than load rating electric current 25% and battery tension greater than or equal to 11.5V-12.5V time, control second switch disconnects, and storage battery is load supplying; Otherwise control second switch to close.
Further, described first switch is electromagnetic switch, the closed or disconnection by car load initiation key Systematical control.
Further, described control module selects DZ60 family chip.
Further, described auxiliary power module selects LT3680 chip and LT3579, and described LT3680 chip is that control module is powered, and LT3579 is that DC-DC module is powered.
Further, described DC-DC module selects phase whole-bridging circuit.
Advantage of the present invention: auxiliary power module of the present invention is connected with storage battery by the first switch, this first switch is closed or disconnection by car load initiation key Systematical control, namely when system need start, closed first switch, storage battery is respectively control module by auxiliary power module and DC-DC module is powered; And when system need stop, disconnecting the first switch, storage battery stops powering for control module and DC-DC module, and namely system stops.So just, can avoid in existing electric vehicle DC electric power system, electrokinetic cell is powered for auxiliary power module always and is caused the drawback of energy waste, namely The present invention reduces energy consumption; And, directly be connected with electrokinetic cell relative to the auxiliary power module of prior art, because the voltage of storage battery is far below the voltage of electrokinetic cell, does not therefore then need too high in the hardware selection of auxiliary power module, therefore can correspondingly reduce hardware cost.
Accompanying drawing explanation
The structured flowchart that Fig. 1 provides for prior art electric vehicle DC electric power system.
The example structure block diagram that Fig. 2 provides for electric vehicle DC electric power system of the present invention.
The example structure block diagram that Fig. 3 provides for electric vehicle DC electric power system of the present invention.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Existing electric vehicle DC electric power system, although the real-time power supply that can realize load, whether system is no matter in running order, electrokinetic cell is wherein always for auxiliary power module is powered, like this when system stalls, still need the energy of consumption systems, and then cause energy loss.The present invention is the above-mentioned technical problem solving the existence of existing electric vehicle DC electric power system, provide a kind of electric vehicle DC electric power system, the auxiliary power module of this system is connected with storage battery by the first switch, like this, not only make system when stopping, disconnect by controlling the first switch, thus save the energy loss of auxiliary power module; And, directly be connected with electrokinetic cell relative to the auxiliary power module of prior art, because the voltage of storage battery of the present invention is far below the voltage of electrokinetic cell, therefore make auxiliary power module of the present invention not need in the selection of hardware too high, namely correspondingly reduce hardware cost of the present invention.
Below by embodiment and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
The example structure block diagram that Fig. 2 provides for electric vehicle DC electric power system of the present invention, electric vehicle DC electric power system comprises electrokinetic cell 21, DC-DC module 22, storage battery 26, auxiliary power module 24, control module 23, load 25 and the first K switch 1, described electrokinetic cell 21 is connected with storage battery 26 with load 25 respectively by DC-DC module 22, storage battery 26 is connected with auxiliary power module 24 one end by the first K switch 1, the other end of auxiliary power module 25 is connected with control module 23 with DC-DC module 22 respectively, described control module 23 is connected with DC-DC module 22, above-mentioned first K switch 1 is the startup of electric vehicle DC electric power system or closing switch, namely when system need start, closed first K switch 1, storage battery 26 is respectively control module 23 by auxiliary power module 24 and DC-DC module 22 is powered, and when system need stop, disconnect the first K switch 1, storage battery 26 stops powering for control module 23 and DC-DC module 22, namely system stops, thus storage battery 26 can be stopped to power to auxiliary power module 24, then avoid the energy loss of auxiliary power module 24, above-mentioned control module 23 is for receiving starting command (such as taking orders by the data gathered in CAN), and according to the voltage of electrokinetic cell 21, output voltage electric current and the load 25 demand modeling electrokinetic cell 21 of DC-DC module 22 are powered for load 25 and storage battery 26 by DC-DC module 22.
In this embodiment, described first K switch 1 is electromagnetic switch, closed or the disconnection by car load initiation key Systematical control, when this first K switch 1 closes, storage battery 26 is respectively control module 23 by auxiliary power module 24 and DC-DC module 22 is powered, and when the first K switch 1 disconnects, storage battery 26 stops powering for control module 23 and DC-DC module 22, i.e. system stalls, therefore, first starting or stoping of electric vehicle DC electric power system can be controlled by the closed of the first K switch 1 or disconnection.
In this embodiment, described control module 23 selects DZ60 family chip, because this chip reliability is high, certainly, the invention is not restricted to said chip, comprises all control modules 23 that can realize technical solution of the present invention.
In this embodiment, described auxiliary power module 24 is LT3680 chip and LT3579 preferably, for being respectively control module 23 and DC-DC module 22 is powered, wherein, LT3680 chip is that control module 23 is powered, and LT3579 is that DC-DC module 22 is powered, object is, LT3680 chip and LT3579 can independently power for control module 23 and DC-DC module 22, and mutually can not produce interference, further ensure that the stability of work of the present invention.Certainly, the invention is not restricted to said chip, comprise all auxiliary power module 24 that can realize technical solution of the present invention.
In this embodiment, described DC-DC module 22 is phase whole-bridging circuit preferably, has high, the external good in anti-interference performance of transformer utilization factor, and have the advantage of larger power output owing to shifting to full-bridge circuit.
Another example structure block diagram that Fig. 3 provides for electric vehicle DC electric power system of the present invention, electric vehicle DC electric power system comprises electrokinetic cell 31, DC-DC module 32, storage battery 36, auxiliary power module 34, control module 33, load 35, first K switch 1 and second switch K2, described electrokinetic cell 31 is connected with storage battery 36 with load 35 respectively by DC-DC module 32, storage battery 36 is connected with auxiliary power module 34 one end by the first K switch 1, the other end of auxiliary power module 34 is connected with control module 33, the other end of described auxiliary power module 34 is also connected with DC-DC module 32 by second switch K2, described control module 33 is connected with DC-DC module 32, for receiving starting command, and according to the voltage of electrokinetic cell 31, output voltage electric current and the load 35 demand modeling electrokinetic cell 31 of DC-DC module 32 are powered for load 35 and storage battery 36 by DC-DC module 32, and judge whether electric vehicle DC electric power system is in light condition, when DC-DC module 32 output current lower than load 35 rated current 25% and storage battery 36 voltage greater than or equal to 11.5V-12.5V time, control second switch K2 to disconnect, namely DC-DC module 32 is stopped to work, powered for load 35 by storage battery 36, otherwise control second switch K2 to close, DC-DC module 32 works on.It should be noted that at this, above-mentioned second switch K2 can be arbitrary switch that can realize above-mentioned functions, such as electromagnetic switch in prior art, does not do concrete introduction at this.
This embodiment further improves to obtain on the basis of a upper embodiment, its difference is, the electric vehicle DC electric power system of this embodiment also comprises second switch K2, this second switch K2 is connected between auxiliary power module 34 and DC-DC module 32, wherein said control module 33 is also for judging whether electric vehicle DC electric power system is in light condition, when DC-DC module 32 output current lower than load 35 rated current 25% and storage battery 36 voltage greater than or equal to 11.5V-12.5V time, control second switch K2 to disconnect, otherwise control second switch K2 to close, like this can be lower at DC-DC module 32 output current, when namely there is underloading situation, DC-DC module 32 is stopped to work, powered for load 35 by storage battery 36, thus avoid the lagging leg of DC-DC module 32 to realize resonance, thus increase stress and the loss of DC-DC module 32, namely DC-DC module 32 inefficiency is reduced, the drawback of reliability and life cycle, and, because auxiliary power module 34 stops powering for DC-DC module 32, then decrease the energy loss of system, and do not affect the normal work of whole system.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. an electric vehicle DC electric power system, comprise electrokinetic cell, DC-DC module, storage battery, auxiliary power module, control module and load, it is characterized in that, also comprise the first switch, described electrokinetic cell is connected with storage battery with load respectively by DC-DC module, and storage battery is connected with auxiliary power module one end by the first switch, and the other end of auxiliary power module is connected with control module with DC-DC module respectively, described control module is connected with DC-DC module, wherein
Described control module is for receiving starting command, and to control electrokinetic cell according to the voltage of electrokinetic cell, the output voltage electric current of DC-DC module and loading demand be load and storage battery power supply by DC-DC module, when the first switch closes, storage battery is respectively control module by auxiliary power module and DC-DC module is powered, and after control module receives starting command, controlling electrokinetic cell by DC-DC module according to the voltage of electrokinetic cell, the output voltage electric current of DC-DC module and loading demand is load and storage battery power supply;
When the first switch disconnects, storage battery stops powering for control module and DC-DC module, and electric vehicle DC electric power system stops.
2. electric vehicle DC electric power system according to claim 1, is characterized in that, electric vehicle DC electric power system also comprises second switch, and this second switch is connected between auxiliary power module and DC-DC module.
3. electric vehicle DC electric power system according to claim 2, it is characterized in that, when the first switch closes, storage battery is respectively after control module and DC-DC module power by auxiliary power module, described control module is also for judging whether electric vehicle DC electric power system is in light condition, when DC-DC module output current lower than load rating electric current 25% and battery tension greater than or equal to 11.5V time, control second switch disconnect, storage battery is load supplying; Otherwise control second switch to close.
4. electric vehicle DC electric power system according to claim 3, is characterized in that, described first switch is electromagnetic switch, the closed or disconnection by car load initiation key Systematical control.
5. electric vehicle DC electric power system according to claim 3, is characterized in that, described control module selects DZ60 family chip.
6. electric vehicle DC electric power system according to claim 3, is characterized in that, described auxiliary power module selects LT3680 chip and LT3579, and described LT3680 chip is that control module is powered, and LT3579 is that DC-DC module is powered.
7. electric vehicle DC electric power system according to claim 3, is characterized in that, described DC-DC module selects phase whole-bridging circuit.
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| CN201110045970.XA CN102651562B (en) | 2011-02-25 | 2011-02-25 | A kind of electric vehicle DC electric power system |
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| CN201110045970.XA CN102651562B (en) | 2011-02-25 | 2011-02-25 | A kind of electric vehicle DC electric power system |
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| CN102651562B true CN102651562B (en) | 2016-03-30 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578270A (en) * | 2014-12-24 | 2015-04-29 | 山东新大洋电动车有限公司 | Vehicle-mounted low-voltage power supply device for battery electric vehicle |
| CN106487090A (en) * | 2015-08-31 | 2017-03-08 | 中车大连电力牵引研发中心有限公司 | Subway controls power supply emergency start apparatus and method with subordinate inverter |
| CN108874009A (en) * | 2018-07-25 | 2018-11-23 | 郑州云海信息技术有限公司 | A kind of method, controller and the system of dynamic adaptation load |
| CN111231669B (en) * | 2018-11-09 | 2022-06-14 | 比亚迪股份有限公司 | Vehicle-mounted charger, power supply system of electric vehicle and electric vehicle |
| CN109256765A (en) * | 2018-11-21 | 2019-01-22 | 广州领世汽车科技有限公司 | A kind of direct-current power distribution box |
| CN112039313B (en) * | 2020-07-28 | 2022-02-18 | 漳州科华技术有限责任公司 | Auxiliary power supply device, control method of auxiliary power supply device, and converter |
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| JP2002044807A (en) * | 2000-07-27 | 2002-02-08 | Yamaha Motor Co Ltd | Power supply for electric vehicle |
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| CN101373904A (en) * | 2007-08-23 | 2009-02-25 | 比亚迪股份有限公司 | Automobile power supply system and control method thereof |
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