CN104108320B - The electronlmobil composite power source of a kind of N-PMOS switch decoupling zero and energy control method - Google Patents
The electronlmobil composite power source of a kind of N-PMOS switch decoupling zero and energy control method Download PDFInfo
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- CN104108320B CN104108320B CN201410293988.5A CN201410293988A CN104108320B CN 104108320 B CN104108320 B CN 104108320B CN 201410293988 A CN201410293988 A CN 201410293988A CN 104108320 B CN104108320 B CN 104108320B
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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
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- Y02T10/72—Electric energy management in electromobility
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Abstract
The electronlmobil composite power source of N-PMOS switch decoupling zero and an energy control method, comprising: battery pack, bidirectional DC-DC converter, super capacitor, nmos switch, PMOS switch, electric capacity of voltage regulation, diode, DSP module, voltage detection module, current detection module and motor inverter; Its mode is: DSP module can decide low and high level according to watt level and export: when power demand is large, DSP module exports high level, and nmos switch conducting, PMOS switch turn off, and super capacitor exports separately; When power demand hour, DSP module output low level, nmos switch turns off, and PMOS switch conducting, battery pack exports separately.The beneficial effect that the present invention produces is: composite power source structure of the present invention and energy control method simple, and effectively can improve system effectiveness.
Description
Technical field
The invention belongs to the vehicle power field of battery-driven car, relate to a kind of composite power source and energy control method thereof of two-way DC/DC conversion used for electric vehicle.
Background technology
Low-carbon emission reduction is the trend of current era and the inevitable requirement of following sustainable development, under this overall situation, for reducing the carbon emission of automobile and saving fuel oil cost, the research and development of electronlmobil are all being gone into overdrive to carry out in countries in the world, and vehicle power technology is the bottleneck of restriction Development of Electric Vehicles.Because battery technology can not have breakthrough at short notice, composite power source arises at the historic moment.
Present stage electronlmobil vehicle mounted electric source problem demanding prompt solution is mainly reflected in: how to reduce automobile start, accelerate, climbing and high-performance cruise time the high-power damaging to battery pack impact; The safety quick recovery of energy also being ensured simultaneously to battery pack how is realized during braking; The how efficiency operation realizing vehicle power at different conditions.In conjunction with composite power source its structural design, the problems referred to above need consider that corresponding energy management strategies comprehensively solves.
Solving high-power output to the method that battery pack damaging is impacted is the direct output scheme of super capacitor: in parallel with super capacitor again after being connected with DC/DC changer by battery, be then connected across inverter both sides, super capacitor plays energy snubber effect.But from energy management angle, battery pack has to pass through the work of DC/DC changer when the direct output scheme of super capacitor makes miniwatt export, thus reduce the output efficiency of battery pack when miniwatt works.Realizing battery pack efficiency operation method when miniwatt exports is the independent output scheme of battery pack: in parallel with battery pack again after being connected with DC/DC by super capacitor, be then connected across inverter both sides, battery pack plays pressure stabilization function.But the independent output scheme of battery pack can cause high-powerly directly impacting battery pack, and this structure is unfavorable for realizing the priority reclamation of super capacitor to braking energy.Super capacitor and battery pack are directly parallel in motor inverter two ends by some Electrical Bicycles, although taken into account two schemes, super capacitor and battery pack export serious coupling, and super capacitor utilization ratio is extremely low.At present, corresponding composite power source and energy control method is not also had to be effectively integrated by two schemes and realize uneoupled control.
summary of the invention:
The object of this invention is to provide electronlmobil composite power source and the energy control method of the decoupling zero of a kind of N-PMOS switch.Composite power source of the present invention and energy control method thereof are not only by independent for battery pack output scheme and the direct output scheme decoupling zero of super capacitor, avoid the high-power direct impact to battery pack simultaneously, to also assures that under miniwatt output condition super capacitor priority reclamation braking energy under composite power source efficiency operation and braking condition.
For realizing above-mentioned functions, technical scheme provided by the invention is: the electronlmobil composite power source of a kind of N-PMOS switch decoupling zero, comprising: battery pack, two-way DC/DC changer, super capacitor, nmos switch, PMOS switch, electric capacity of voltage regulation, diode, DSP module, voltage detection module, current detection module and motor inverter; Battery pack mouth connects the drain electrode of PMOS switch and the interface 1 of two-way DC/DC changer respectively, the source electrode of PMOS switch connects the input end of diode, the mouth of diode connects one end of the source electrode of nmos switch, the positive pole of electric capacity of voltage regulation and motor inverter respectively, the drain electrode of nmos switch connects the positive pole of super capacitor and two-way DC/DC converter interface 2 respectively, the other end of motor inverter connects electric capacity of voltage regulation negative pole, the negative pole of super capacitor and the interface 4 of two-way DC/DC changer respectively, and the input end of battery pack connects the interface 3 of DC/DC changer; Voltage detection module connects electric capacity of voltage regulation, for detecting the voltage at electric capacity of voltage regulation two ends; Current detection module is connected on motor inverter bus, for detecting motor inverter bus bar side electric current; Detection data are sent to DSP module by voltage detection module and current detection module respectively, and DSP module connects the grid of nmos switch and PMOS switch respectively, and calculate effect horse power according to electric current and voltage, and outgoing level drives PMOS switch and nmos switch.
Further, when startup and power stage, DSP module outgoing level controls PMOS switch and nmos switch simultaneously, makes a switch conduction, makes another switch OFF simultaneously.
Further, the voltage of described super capacitor is higher than battery voltage.
Further, described DSP module adopts micro controller system or other special drive circuit chip.
The energy control method that the electronlmobil composite power source that the invention still further relates to the decoupling zero of a kind of N-PMOS switch adopts: DSP module can decide low and high level according to watt level and export: when power demand is large, DSP module exports high level, nmos switch conducting, PMOS switch turn off, and super capacitor exports separately; When power demand hour, DSP module output low level, nmos switch turns off, and PMOS switch conducting, battery pack exports separately.
Further, when power demand is less than 0, DSP module does not work, braking energy by nmos switch to super capacitor and batteries charging.
Further, composite power source is when startup or high-power output, and DSP module exports high level and also keeps certain hour, now nmos switch conducting, and PMOS switch turns off, and avoids the high-power impact to battery pack of this two states.
Further, when power stage, the high level signal that DSP module exports needs time delay certain hour, makes nmos switch, PMOS switch state infrequently switches.
The beneficial effect that the present invention produces is: composite power source has been unified the advantage of the independent output scheme of battery pack and the direct output scheme of super capacitor, and makes two-way output action contrary by N-PMOS switch control rule, achieves two schemes full decoupled.Nmos switch and PMOS switch only need DSP module to export a level controling signal, and high-power is the direct output scheme of super capacitor, and super-capacitor voltage work followed by DC/DC changer; Miniwatt is the independent output scheme of battery pack, reduces the loss of energy on DC/DC changer; Super capacitor priority reclamation braking energy during braking.Composite power source structure of the present invention and energy management strategies simple, and effectively can improve system effectiveness.
accompanying drawing illustrates:
Fig. 1 is composite power source and the energy control method constructional drawing of the embodiment of the present invention;
Fig. 2 is the two-way DC/DC changer of the embodiment of the present invention;
Fig. 3 is that the composite power source programme of work of the embodiment of the present invention selects diagram of circuit;
Fig. 4 is super capacitor peak efficiency operation point and the battery pack maximum power operation point of the embodiment of the present invention.
detailed description of the invention:
Below in conjunction with accompanying drawing, the present invention is further illustrated, and embodiment does not limit the scope of the invention for illustration of the present invention, and partial parameters can do corresponding Matching and modification according to the design parameter of element.Such as: in embodiment, the peak efficiency operation point of DC/DC changer is 12KW, during practical operation, this value is relevant with actual parameter to the type of DC/DC changer.Equally, the maximum output power of battery pack is 16KW, and this value is relevant to the series-parallel system of battery module quantity, battery material and cell.
Present embodiment describes electronlmobil composite power source and the energy control method of the decoupling zero of a kind of N-PMOS switch, specifically as shown in figure, system is made up of battery pack 8, two-way DC/DC changer 4, super capacitor C1, nmos switch 7, PMOS switch 6, electric capacity of voltage regulation C2, diode D1, DSP module 1, voltage detecting circuit 2, current detection circuit 3 and motor inverter 5.Battery pack 8 mouth connects the drain electrode of PMOS switch 6 and the interface 1 of two-way DC/DC changer 4 respectively, source electrode connects the input end of diode D1, the mouth of diode D1 connects the source electrode of nmos switch 7 respectively, the positive pole of electric capacity of voltage regulation C2 and one end of motor inverter 5, the drain electrode of nmos switch 7 connects the positive pole of super capacitor C1 and two-way DC/DC changer 4 interface 2 respectively, the other end of motor inverter 5 connects electric capacity of voltage regulation C2 negative pole respectively, the negative pole of super capacitor C1 and the interface 4 of two-way DC/DC changer 4, the input end of battery pack 8 connects the interface 3 of two-way DC/DC changer 4, voltage detection module 2 connects electric capacity of voltage regulation, for detecting the voltage at electric capacity of voltage regulation C2 two ends, current detection module 3 is connected on the bus of motor inverter 5, for detecting motor inverter 5 bus bar side electric current, detection data are sent to DSP module 1 by voltage detection module 2 and electric circuit inspection module 3 respectively, DSP module 1 connects the grid of nmos switch 7 and PMOS switch 6 respectively, and calculating effect horse power according to electric current and voltage, outgoing level drives PMOS switch 6 and nmos switch 7.
Battery pack 8 normal voltage is 50% of super-capacitor voltage, thus ensures that the maximum discharge energy of super capacitor C1 is 75%.PMOS switch 6 is connected in battery pack 8 output loop, and nmos switch 7 is connected in super capacitor C1 output loop, the same Automatic level control that two switches are exported by DSP module 1, and all action is contrary at any time, plays complementary decoupling function.Diode D1 is connected in battery pack 8 output loop, avoids super capacitor C1 and braking energy to charge directly to battery pack 8.DSP module 1 calculates real output according to the voltage signal of motor inverter 5 bus current signal and electric capacity of voltage regulation, and exports low and high level according to watt level.
As shown in Figure 2, wherein, battery pack 8 connects left side to the two-way DC/DC changer of the present embodiment, and super capacitor C1 connects right side, and left side to right side is boosting, and right side to left side is step-down.From structure, battery pack 8 and super capacitor C1 are connected in parallel on the two ends of two-way DC/DC changer 4.
Concrete programme of work selects diagram of circuit as shown in Figure 3.Composite power source is started working after starting, and first judges whether power is just, if power stage is the size that canonical judges power, selects the direct output scheme of super capacitor C1 or battery pack 8 output scheme separately further.If be not just, regenerative brake scheme must meet motor inverter 5 side electric capacity of voltage regulation C2 voltage higher than super capacitor C1 voltage, otherwise select other brake mode, after entering regenerative brake scheme, select the independent recovery scheme of super capacitor C1, battery pack 8 and the common recovery scheme of super capacitor C1 further according to B.P. size.
Concrete energy control method under different schemes is:
Composite power source is when starting or when power demand is large, DSP module 1 exports high level and controls nmos switch 7 and PMOS switch 6 simultaneously, and nmos switch 7 conducting, PMOS switch 6 turn off, and is the direct output scheme of super capacitor C1, and continues at least 2 seconds.When power demand hour, DSP module 1 output low level, nmos switch 7 turns off, PMOS switch 6 conducting, is battery pack 8 separately output scheme, now only battery pack 8 horsepower output, and two-way DC/DC changer 4 and super capacitor C1 do not work.When power demand is less than 0, DSP module 1 does not work, because super capacitor C1 voltage is higher than battery pack 8 voltage, and diode D1 suppresses battery pack 8 directly to reclaim braking energy, and braking energy can only be charged to super capacitor C1 and battery pack 8 by nmos switch 7 flywheel diode.
When super capacitor C1 directly exports, when super capacitor SOC is lower than lower limit M
lower limittime, the 4 pairs of battery pack 8 maximum power boostings of two-way DC/DC changer are charged to super capacitor C1, are 16KW; When super capacitor SOC is higher than upper limit value M
the upper limittime, two-way DC/DC changer 4 does not work, and super capacitor C1 is separately for motor inverter 5 provides energy; Super capacitor SOC is at lower limit M
lower limitand upper limit value M
the upper limitbetween time, two-way DC/DC changer 4, with peak efficiency boosting work, is 12KW; DC/DC peak efficiency boosting operation point and battery pack 8 maximum power operation point are as shown in Figure IV.Battery pack 8 separately output scheme time, maximum power more than 12KW, must not exceed this value and switches to the direct output scheme of super capacitor C1.
During braking, if B.P. is very little, motor inverter 5 bus bar side electric capacity of voltage regulation voltage C2 lower than super capacitor C1 voltage, then adopts alternate manner braking.When meeting regenerative brake scheme, for ensureing super capacitor C1 priority reclamation braking energy, super capacitor SOC is lower than upper limit value M
the upper limitfor super capacitor C1 reclaims separately braking energy scheme, during higher than higher limit, the step-down of partial brake energy is charged to battery pack 8, but the maximum power that battery pack 8 reclaims is no more than 12KW, and regenerative brake power should be less than or equal to super capacitor C1 and the recoverable maximum power of battery pack 8, ensure battery pack 8 safety, now jointly reclaim braking energy scheme for battery pack 8 and super capacitor C1.
Above embodiment is only for embodying technical conceive of the present invention and feature; be not intended to limit protection scope of the present invention; such as DSP module 1 can replace with micro controller system or other special driving circuits or chip; all doing in the spirit and principles in the present invention is equal to replacement or modifies, and is all encompassed in scope.
Claims (8)
1. the electronlmobil composite power source of N-PMOS switch decoupling zero, it is characterized in that, comprising: battery pack, two-way DC/DC changer, super capacitor, nmos switch, PMOS switch, electric capacity of voltage regulation, diode, DSP module, voltage detection module, current detection module and motor inverter; Battery pack mouth connects the drain electrode of PMOS switch and the interface 1 of two-way DC/DC changer respectively, the source electrode of PMOS switch connects the input end of diode, the mouth of diode connects one end of the source electrode of nmos switch, the positive pole of electric capacity of voltage regulation and motor inverter respectively, the drain electrode of nmos switch connects the positive pole of super capacitor and two-way DC/DC converter interface 2 respectively, the other end of motor inverter connects electric capacity of voltage regulation negative pole, the negative pole of super capacitor and the interface 4 of two-way DC/DC changer respectively, and the input end of battery pack connects the interface 3 of two-way DC/DC changer; Voltage detection module connects electric capacity of voltage regulation, for detecting the voltage at electric capacity of voltage regulation two ends; Current detection module is connected on the bus of motor inverter, for detecting motor inverter bus bar side electric current; Detection data are sent to DSP module by voltage detection module and current detection module respectively, and DSP module connects the grid of nmos switch and PMOS switch respectively, and calculate effect horse power according to electric current and voltage, and outgoing level drives PMOS switch and nmos switch.
2. the electronlmobil composite power source of a kind of N-PMOS switch according to claim 1 decoupling zero, it is characterized in that: when startup and power stage, DSP module outgoing level controls PMOS switch and nmos switch simultaneously, makes a switch conduction, makes another switch OFF simultaneously.
3. the electronlmobil composite power source of a kind of N-PMOS switch according to claim 1 decoupling zero, is characterized in that: the voltage of described super capacitor is higher than battery voltage.
4. the electronlmobil composite power source of a kind of N-PMOS switch according to claim 1 decoupling zero, is characterized in that: described DSP module adopts micro controller system or other special drive circuit chip.
5. the energy control method that adopts of the electronlmobil composite power source of a kind of N-PMOS switch according to claim 1 decoupling zero, it is characterized in that: described DSP module can decide low and high level according to watt level and export: when power demand is large, DSP module exports high level, nmos switch conducting, PMOS switch turn off, and super capacitor exports separately; When power demand hour, DSP module output low level, nmos switch turns off, and PMOS switch conducting, battery pack exports separately.
6. energy control method according to claim 5, is characterized in that: when power demand is less than 0, DSP module does not work, braking energy by nmos switch to super capacitor and batteries charging.
7. energy control method according to claim 5, it is characterized in that: composite power source is when startup or high-power output, and DSP module exports high level and also keeps certain hour, now nmos switch conducting, PMOS switch turns off, and avoids the high-power impact to battery pack of this two states.
8. energy control method according to claim 5, is characterized in that: when power stage, and the high level signal that DSP module exports needs time delay certain hour, makes nmos switch, PMOS switch state infrequently switches.
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| CN104590036B (en) * | 2014-12-23 | 2017-01-04 | 安徽安凯汽车股份有限公司 | A kind of electricity electric mixed dynamic system efficiently brake recovery method |
| CN106143168B (en) * | 2016-07-19 | 2019-03-01 | 西安交通大学 | A kind of multi-channel parallel of electric car interlocks output type mixed energy storage system and method |
| CN106364341B (en) * | 2016-08-26 | 2018-12-07 | 西安交通大学 | A kind of the multi-mode switching composite power source topological structure and control method of electric car |
| CN106564398B (en) * | 2016-11-08 | 2018-12-07 | 西安交通大学 | A kind of vehicle-mounted hybrid power system and control method of electric car |
| CN107332332B (en) * | 2017-06-21 | 2019-10-11 | 西安交通大学 | A kind of simplified booster type electric car composite power source structure and its control method |
| CN109866622B (en) * | 2019-03-26 | 2021-06-04 | 西安电子科技大学芜湖研究院 | High-efficiency energy recovery system based on quick-charging battery |
| CN115179813A (en) * | 2021-03-23 | 2022-10-14 | 上海比耐信息科技有限公司 | Electric automobile energy management system and method |
| CN113346747B (en) * | 2021-05-07 | 2022-08-09 | 西安交通大学 | Multi-power-supply integrated power supply system and power supply method of symmetrical buck-boost circuit |
| CN114179960B (en) * | 2021-12-28 | 2023-09-15 | 山东中科先进技术有限公司 | Electric vehicle power supply, electric vehicle and electric vehicle power supply operation method |
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