CN104917270A - High-power digital variable-frequency positive-negative pulse quick-charging system based on energy feedback - Google Patents
High-power digital variable-frequency positive-negative pulse quick-charging system based on energy feedback Download PDFInfo
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Abstract
The invention discloses a high-power digital variable-frequency positive-negative pulse quick-charging system based on energy feedback. The high-power digital variable-frequency positive-negative pulse quick-charging system comprises a power-frequency AC input grid, a high-power charging main circuit, a four-stage quick-charging control circuit, a variable-frequency positive-negative pulse generation circuit, a negative pulse discharging energy feedback circuit and a battery load, wherein the input end of the high-power charging main circuit is connected with the power-frequency AC input grid, the output end of the high-power charging main circuit is connected with the variable-frequency positive-negative pulse generation circuit, the variable-frequency positive-negative pulse generation circuit is connected with the battery load, the input end of the negative pulse discharging energy feedback circuit is connected with the variable-frequency positive-negative pulse generation circuit, and the output end of the negative pulse discharging energy feedback circuit is connected with the power-frequency AC input grid. By the high-power digital variable-frequency positive-negative pulse quick-charging system, the polarization problem of which concentration polarization is major is effectively eliminated, high-efficiency charging is achieved, the service life of a storage battery is prolonged, and meanwhile, energy can be recycled by the negative pulse discharging energy feedback system.
Description
Technical field
The present invention relates to electric vehicle rapid charging and energy feedback field, particularly a kind of high power digital frequency conversion positive negative pulse stuffing quick charging system based on energy feedback.
Background technology
Storage battery as electric automobile core composition is the key factor determining vehicle performance, and its performance directly affects power capacity and the flying power of electric automobile.But as the storage battery energy supplement charging ring program before on charging rate and charging effect, all can not meet actual requirement, even some charging technique is accelerate charging rate to be wasted by the energy of discharge depolarization, and this has run counter to the design original intention of energy-conserving and environment-protective.
Along with the development of large power all-controlled power device and Digital Control are in the successful Application of electric and electronic technical field, occurred traditional electronic load, it is widely used in the measuring equipment of the power supply energy as equivalent load.Wherein, energy feedback type electronic load is based on high-frequency electrical energy transformation theory, and the energy circulation using the method for energy back to be exported by various independent AC and DC power supply unit to be tested or that enter the trial run stage uses.It had both completed the function of certain loads, realized regulating on a large scale output current, simulated the load of various impedance, can make tested power work under the pattern of purely resistive, resistance sense or resistance capacitive load; Simultaneously again the energy of unnecessary consumption in conventional static load and general electronic load, by a series of conversion, with the form of standard power frequency sine wave by the output electric energy feedback of tested power supply to electrical network, the rate that recycles of load energy can reach more than 80%, thus greatly saved the unnecessary consumption of the energy and the expenditure of the electricity charge, have broad application prospects.
Find by prior art documents, " research of intermittently-positive negative pulse stuffing fast storage battery charging method " (Wu Tiezhou, Bai Ting, Hu Liping, plum dragon. the research of intermittently-positive negative pulse stuffing fast storage battery charging method. electronic device, 2014, 37 (12): 1245-1250), propose interval-positive negative pulse stuffing mise-a-la-masse method, according to gassing point voltage and polarizing voltage monitoring storage battery polarization situation, adopt two kinds of fuzzy controllers, determine the positive negative pulse stuffing width in interval-positive negative pulse stuffing mise-a-la-masse method respectively, alternately charging and discharging is adopted to reduce or eliminate the polarization phenomena in charging process, but what adopt is the positive negative pulse stuffing of fixed frequency, do not adopt frequency conversion positive negative pulse stuffing fast charge method and realize negative pulse discharge energy feedback.
Summary of the invention
In order to overcome the shortcoming of prior art with not enough, the invention provides a kind of high power digital frequency conversion positive negative pulse stuffing quick charging system based on energy feedback.
The present invention adopts following technical scheme:
Based on a high power digital frequency conversion positive negative pulse stuffing quick charging system for energy feedback, comprise industrial frequency AC input electrical network, high-power charging main circuit, four stages quick charge control circuit, the generation of frequency conversion positive negative pulse stuffing circuit, negative pulse discharge energy feedback circuit and cell load;
The input of described high-power charging main circuit inputs electrical network with industrial frequency AC and is connected; The output of described high-power charging main circuit produces circuit with frequency conversion positive negative pulse stuffing and is connected; Described frequency conversion positive negative pulse stuffing produces circuit and is connected with cell load; The input of described negative pulse discharge energy feedback circuit produces circuit with frequency conversion positive negative pulse stuffing and is connected; The output of described negative pulse discharge energy feedback circuit inputs electrical network with industrial frequency AC and is connected;
Described high-power charging main circuit comprises the input rectifying filtration module, high-frequency inversion module, power voltage changing module and the output rectification filter module that are electrically connected successively;
Described four stages quick charge control circuit comprises DSP Digital Control module, MOSFET high-frequency drive module, IGBT drive module and current-voltage sampling and signal processing module;
Described frequency conversion positive negative pulse stuffing produces circuit and comprises frequency conversion positive negative pulse stuffing generation module;
Described negative pulse discharge energy feedback circuit comprises the filtration module, Boost boost module and the Inverter Unit that are electrically connected successively.
The output of the described input of MOSFET high-frequency drive module, the input of IGBT drive module and current-voltage sampling and signal processing module all with DSP Digital Control model calling, wherein current-voltage sampling and signal processing module are specially three, and its input is connected with high-frequency inversion module, Inverter Unit and Boost boost module respectively;
Described MOSFET high-frequency drive module is specially 2, and its output is connected with high-frequency inversion module and Boost boost module respectively.
Described Boost boost module is made up of boost chopper, and described positive negative pulse stuffing generation module comprises positive pulse output circuit and negative pulse output circuit.
Described Inverter Unit adopts the topological structure of voltage-type full-bridge inverter.
Described four stages quick charge control circuit realizes precharge, positive negative pulse stuffing quick charge by DSP Digital Control module controls, supplies charging and floating charge four-stage fast pulse charger.
Be specially:
Stable low current precharge is adopted to battery, when making cell voltage progressively rise to the threshold value accepting large current charge, enters positive negative pulse stuffing quick charge;
Forward big current and negative-going pulse is adopted to carry out positive negative pulse stuffing quick charge, control to be switched to when battery both end voltage rises to certain value to supply the charging stage, this stage adopts constant voltage charge, and charging current reduces gradually, when electric current drops to a certain threshold value, forward the floating charge stage to;
Described frequency conversion positive negative pulse stuffing produces circuit by detecting charge condition of battery, the charging current of charging pulse is changed in real time and charging pulse frequency realizes effectively modulating the positive negative pulse stuffing in charging process according to cell voltage, namely with high-frequency impulse, low-frequency pulse is modulated, the intensity of unit pulse is periodically switched between strong and weak and positive and negative.Because frequency conversion electric current is modulated original charging current and discharging current, the intensity of unit pulse is periodically switched between high-frequency impulse and low-frequency pulse.
Described frequency conversion positive negative pulse stuffing produces circuit and regulates in real time frequency conversion positive negative pulse stuffing, by IGBT drive module, the low and high level that assigned I/O port exports is amplified, opening and shutting off of control IGBT pipe, thus realize the output of positive pulse electric current and negative pulse current, by the anti-battery reversal connection of diode, control negative pulse discharge direction.
Described negative pulse discharge energy feedback circuit adopts energy feedback type electronic load topology, and the negative pulse produced is inputted electrical network amplitude and the consistent output of phase place by boosting and inversion generation and industrial frequency AC, and and net of wiring back.
Described Inverter Unit controls turning on and off of single-phase grid-connection inverter circuit MOSFET by SPWM.
The present invention has following advantage and beneficial effect:
(1) frequency conversion positive negative pulse stuffing quick charging system is eliminating under the polarization problem condition based on concentration polarization, reaches efficient charging, improves the life of storage battery.By effectively modulating the positive negative pulse stuffing in charging process, the intensity of unit pulse low frequency periodic between strong and weak and positive and negative is switched, obtain periodically variable strong and weak impulse train and the positive negative pulse stuffing group that specifically effectively can reduce charging resistance, break the intrinsic charging curve of battery, thus the charging interval is shortened greatly;
(2) negative pulse discharge energy feedback system realizes energy regenerating.Existing positive negative pulse stuffing quick charging system can only be discharged by discharge resistance, has part energy like this and is lost on discharge resistance.Discharging current by this system inversion telegram in reply net, is reached energy-efficient effect by energy feedback grid-connected system of the present invention;
(3) system stability, fast response time, control precision is high, and performance is good, and reliability is high; This system take digital signal processor DSP as core, pass through software programming, system is made to realize stable, reliable high-power output, in addition, the present invention additionally uses the digital Control Technology of current/voltage feedback, have employed DSP technology and Switching Power Supply charging, make that the dynamic characteristic of system is excellent, control precision is high, system stability, during charging, fail safe is high, and reliability is high.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention;
Fig. 2 is the high-power charging main circuit diagram of the present invention;
Fig. 3 is each stage current waveform figure of the present invention four stage quick charge control circuit;
Fig. 4 is frequency conversion positive negative impulse current oscillogram of the present invention;
Fig. 5 is frequency conversion positive negative pulse stuffing generation module circuit diagram of the present invention;
Fig. 6 is Boost circuit figure of the present invention;
Fig. 7 is Inverter Unit circuit diagram of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, based on a high power digital frequency conversion positive negative pulse stuffing quick charging system for energy feedback, comprise industrial frequency AC input electrical network, high-power charging main circuit, four stages quick charge control circuit, the generation of frequency conversion positive negative pulse stuffing circuit, negative pulse discharge energy feedback circuit and cell load;
Described high-power charging main circuit comprises the input rectifying filtration module 101, high-frequency inversion module 102, power voltage changing module 103 and the output rectification filter module 104 that are electrically connected successively;
Described four stages quick charge control circuit comprises DSP Digital Control module 106, MOSFET high-frequency drive module 107, IGBT drive module 108 and current-voltage sampling and signal processing module 112; Described frequency conversion positive negative pulse stuffing produces circuit and comprises frequency conversion positive negative pulse stuffing generation module 105; Described negative pulse discharge energy feedback circuit comprises the filtration module 109, Boost boost module 110 and the Inverter Unit 111 that are electrically connected successively; Described industrial frequency AC input electrical network is 220V alternating current;
The input of described high-power charging main circuit inputs electrical network with industrial frequency AC and is connected; The output of described high-power charging main circuit produces circuit with frequency conversion positive negative pulse stuffing and is connected; Described frequency conversion positive negative pulse stuffing produces circuit and is connected with cell load; The input of described negative pulse discharge energy feedback circuit produces circuit with frequency conversion positive negative pulse stuffing and is connected; The output of described negative pulse discharge energy feedback circuit inputs electrical network with industrial frequency AC and is connected;
Described DSP Digital Control module 106 is connected with the output of the input of MOSFET high-frequency drive module 107, the input of IGBT drive module 108 and current-voltage sampling and signal processing module 112 respectively; The output of described MOSFET high-frequency drive module 107 is connected with the input of the input of high-frequency inversion module 102, the output of Boost boost module 110 and Inverter Unit 111; The output of described IGBT drive module 108 is connected with the input of frequency conversion positive negative pulse stuffing generation module 105; The input of described current-voltage sampling and signal processing module 112 is connected with the output of the output of high-frequency inversion module 102, Boost boost module 110 and the output of Inverter Unit 111;
Described frequency conversion positive negative pulse stuffing generation module 105 pairs of frequency conversion positive negative pulse stuffings regulate in real time, by IGBT drive module, the low and high level that assigned I/O port exports is amplified, opening and shutting off of control IGBT pipe, thus realize the output of positive pulse electric current and negative pulse current, by the anti-battery reversal connection of diode, control negative pulse discharge direction;
Described MOSFET high-frequency drive module 107 drives high-frequency inversion module and Boost boost module by the switching time controlling power device switch mosfet pipe;
Described IGBT drive module 108 drives frequency conversion positive negative pulse stuffing generation module by controlling opening of power device IGBT switching tube with turning off;
Described Inverter Unit 111 controls turning on and off of single-phase grid-connection inverter circuit MOSFET by SPWM, thus obtains inputting the consistent alternating current of electrical network with industrial frequency AC;
Described DSP Digital Control module 106 is changed by A/D, the electric current collected and voltage signal are delivered in digital signal processor, digital signal processor carries out closed-loop control by PI algorithm to the electric current of high-power charging main circuit and voltage, produce the phase-shift PWM waveform needed, through the turn-on and turn-off time of MOSFET high-frequency drive module controls power device switch mosfet pipe, control electric current and voltage, drive high-frequency inversion module and Inverter Unit.
Simultaneously, when described DSP Digital Control module 106 is interrupted given by timer period, ordered pair assigned I/O port carries out the conversion of low and high level, thus control opening and shutoff of power device IGBT by IGBT drive module, to reach the object producing positive negative impulse current, realize Digital Control;
Fig. 2 is the high-power charging main circuit diagram of the present invention, adopt phase shifting full bridge soft switch main circuit topology, by current rectifying and wave filtering circuit, full bridge structure circuit, isolating transformer, all-wave output rectification circuit, filter capacitor and load composition, wherein D1-D4 is that 220V exchanges input rectifying diode, and L1, C1 and C2 form input filter circuit, and Q1-Q4 is 4 switch mosfet pipes, with parasitic diode and parasitic capacitance on each switching tube, L2 is resonant inductance, and D5-D8 is for exporting rectifier diode, and inductance L 3, electric capacity C8 and C9 form output filter circuit.The brachium pontis of Q1 and Q3 composition is leading-bridge, the brachium pontis of Q2 and Q4 composition is lagging leg, and 2 power tubes of each brachium pontis become 180 ° of complementary conductings, and the angle of flow between two brachium pontis differs a phase place, i.e. phase shifting angle, by regulating this phase shifting angle just can regulation output electric current and voltage.In high-frequency converter loop, the stray inductance of the parasitic capacitance of master power switch pipe and isolating transformer, leakage inductance and resonant inductance etc. constitute a LC resonant tank, no-voltage resonant commutation is realized in device for power switching switching process, it is made to be operated in Sofe Switch state, switching loss is low, and the electromagnetic stress of device significantly reduces.
Fig. 3 is each stage current waveform figure of the present invention four stage quick charge control circuit.The present invention by the precharge of dsp controller programming realization, positive negative pulse stuffing quick charge, supply charging and floating charge four stage fast pulse charger method.Four charging stage conversion opportunities are determined and the calculating of each stage charge parameter and control DSP program control realize.
For long-term no battery, newly battery or when the battery that the charging initial stage has been in deep discharge conditions charges, take quick charge can affect the life-span of battery at the very start.In order to avoid this problem first will carry out stable low current precharge to battery, make cell voltage increase, enter the positive negative pulse stuffing quick charge stage again when cell voltage is raised to the threshold value that can accept large current charge.
The resistive polarization that positive negative pulse stuffing quick charge adopts forward big current and negative-going pulse to effectively overcome battery in charging process is reacted, concentration difference polarization is reacted, battery lead plate polarization reaction, avoid the plate burl of battery in charging process on battery lead plate brilliant, the bioactive molecule intensifying inertia or death makes electric energy shift with high efficiency.When bear from electric field, battery is had an effect time, the temperature rise of effective control battery, reduces the generation of bubble in battery, battery is charged under minimum internal resistance, realize by the balance of rechargable battery interior media and the maintenance to pole plate, realize the equilibrium charging of low temperature big current.
In the positive negative pulse stuffing quick charge stage, be switched to by program control when battery both end voltage rises to certain value and supply the charging stage.The charging of this stage adopts constant voltage charge, can make the fast quick-recovery of battery capacity.Now charging current reduces gradually, when electric current drops to a certain threshold value, proceeds to the floating charge stage.
The floating charge stage is mainly used to the energy that supplementary self-discharge of battery consumes, as long as to be connected on charger and charger switches on power at battery, charger constantly supplements electric charge, always battery can be made like this to be in full charge state will to battery.Now also indicate that charging process terminates.
Fig. 4 is frequency conversion positive negative impulse current oscillogram of the present invention.Pulse current charge is due in the process of charging, and gassing and polarization problem can be resolved, and therefore this charging modes can also improve the useful life of battery.But the charging process due to battery is a complicated electrochemical process, it is a lot of because have that impact is charged, and concentration of electrolyte, plate active material concentration, ambient temperature etc. all can have an impact to charging.Even if also can make a world of difference along with the difference of discharge condition, use and storage life for the charging of same model with the similar battery of capacity.Therefore the pulse charging manner of this fixed frequency is not well positioned to meet actual needs.
The present invention proposes frequency conversion positive negative pulse stuffing charging method on the basis of normal pulsed charging method for this reason.The method is by effectively modulating the positive negative pulse stuffing in charging process, modulate with the low-frequency pulse 1 of high-frequency impulse 2 to different pulse parameter, described low-frequency pulse 1 has low frequency, small area analysis, big space rate, described high-frequency impulse 2 has high frequency, big current and little duty ratio, and the intensity of unit pulse is periodically switched between strong and weak and positive and negative.Because frequency conversion electric current is modulated original charging current and discharging current, the intensity of unit pulse is periodically switched between high-frequency impulse 2 and low-frequency pulse 1, obtain periodically variable strong and weak impulse train and the positive negative pulse stuffing group that specifically effectively can reduce charging resistance, eliminate the polarization of battery better, break the intrinsic charging curve of battery, make battery be in optimum electric current receive status all the time, shorten its charging interval, improve charging rate and efficiency.
By real-time monitoring system monitoring by rechargable battery terminal voltage, temperature, by information such as the dynamic internal resistance of rechargeable battery, charging currents, dynamic conditioning pulse frequency f
1and f
2because charging pulse width, interval and discharge pulse width and respective pulse frequency are all dynamic conditioning, therefore cell internal pressure, temperature and impedance can be made effectively to reduce in the process of charging, improve the charge acceptance of charge efficiency and battery, thus the charging interval is shortened greatly.
Fig. 5 is frequency conversion positive negative pulse stuffing generation module circuit diagram of the present invention, comprise positive pulse output circuit and negative pulse output circuit, described positive pulse output circuit is made up of IGBT switching tube V1, and described negative pulse output circuit is made up of IGBT switching tube V2 and diode D9, D10.
The present invention produces timer period by DSP digital control module 106 and interrupts, and realizes the output low and high level conversion of positive negative pulse stuffing control I/O port according to the sequential of procedure stipulation, after the amplification of IGBT drive module 108, realizes the control to positive negative pulse stuffing.The stage is produced in positive pulse, DSP digital control module 106 control I/O port I/O1 exports high level and I/O2 output low level and amplifies through IGBT drive module 108, thus control to open IGBT pipe V1 and turn off IGBT pipe V2, realize the charging of positive pulse current versus cell load.The stage is produced in negative pulse, DSP digital control module 106 control I/O port I/O1 output low level and I/O2 export high level and amplify through IGBT drive module, thus control turn off IGBT pipe V1 and open IGBT pipe V2, cell load discharges, instantaneous relase is discharging current significantly, namely forms negative pulse discharge electric current, thus eliminates the gassing polarization phenomena of battery, efficiency utilization charging current, reduce the wastage rate.Diode D9, D10 are used for anti-battery reversal connection, control the direction of negative pulse discharge.
Fig. 6 is Boost boost module circuit diagram of the present invention.Boost boost module is made up of boost chopper, and inductance L 4 energy storage makes voltage pump rise, and electric capacity C14 and C15 keeps voltage as filter; Adjust DSP flush bonding processor timer comparing unit register parameters in real time according to the size of feedback voltage, change the duty ratio of PWM, thus change the conduction ratio of switch mosfet pipe, make Boost boost module 102 stably output dc voltage.
Fig. 7 is Inverter Unit circuit diagram of the present invention.Preferably, Inverter Unit 111 adopts the topological structure of voltage-type full-bridge inverter, voltage-type full-bridge inverter is made up of DC side parallel storage capacitor and full bridge structure circuit, wherein Q6 ~ Q9 is 4 switch mosfet pipes, with parasitic diode and parasitic capacitance on each switching tube.It has 4 brachium pontis, and brachium pontis Q6 and Q9 is as a pair, and brachium pontis Q7 and Q8 is right as another, and paired two brachium pontis conducting simultaneously, two to alternately each conducting 180 °.Voltage-type full-bridge inverter effectively can improve dynamic response performance and the direct voltage utilance of system, and can work in unipolarity frequency multiplication mode, can obtain good output ripple performance with less filter, has larger effect to raising systematic function.
Preferably, for obtaining the good filter effect of quality, output filtering module adopts LC structure, and filter is made up of inductance and electric capacity, and its structure is simple, and controls easily to realize.
High-power charging main circuit and four stage quick charge control systems are realized by phase-shifting full-bridge main circuit and DSP digital Control Technology.By effectively modulating the positive negative pulse stuffing in charging process, unit pulse intensity low frequency periodic between strong and weak and positive and negative being switched, obtains periodically variable strong and weak impulse train and the positive negative pulse stuffing group that specifically effectively can reduce charging resistance.Replace the real-time depolarising of conventional fixed-frequency pulse with variable-frequency pulse, break the intrinsic charging curve of storage battery, shorten its charging interval; On the other hand, the energy discharged in negative pulse process of depolarization is carried out energy regenerating by energy feedback system, when negative pulse charging rests depolarising by energy feedback to electrical network, improve energy-saving effect further.The constant-voltage charging device and the single charging process that causes of constant current charger charging facility which overcome existing routine are large to storage battery loss, charging interval is long, cannot really quick charge, and the natural frequency pulse in charging process of existing positive negative pulse stuffing fast charge method exports and can not meet the shortcomings such as charge in batteries characteristic and energy dissipation well, improve the deficiency that current charging system brings, solve charging rapidity and energy-conservation problem of charging.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1. the high power digital frequency conversion positive negative pulse stuffing quick charging system based on energy feedback, it is characterized in that, comprise industrial frequency AC input electrical network, high-power charging main circuit, four stages quick charge control circuit, the generation of frequency conversion positive negative pulse stuffing circuit, negative pulse discharge energy feedback circuit and cell load;
The input of described high-power charging main circuit inputs electrical network with industrial frequency AC and is connected; The output of described high-power charging main circuit produces circuit with frequency conversion positive negative pulse stuffing and is connected; Described frequency conversion positive negative pulse stuffing produces circuit and is connected with cell load; The input of described negative pulse discharge energy feedback circuit produces circuit with frequency conversion positive negative pulse stuffing and is connected; The output of described negative pulse discharge energy feedback circuit inputs electrical network with industrial frequency AC and is connected;
Described high-power charging main circuit comprises the input rectifying filtration module, high-frequency inversion module, power voltage changing module and the output rectification filter module that are electrically connected successively;
Described four stages quick charge control circuit comprises DSP Digital Control module, MOSFET high-frequency drive module, IGBT drive module and current-voltage sampling and signal processing module;
Described frequency conversion positive negative pulse stuffing produces circuit and comprises frequency conversion positive negative pulse stuffing generation module;
Described negative pulse discharge energy feedback circuit comprises the filtration module, Boost boost module and the Inverter Unit that are electrically connected successively.
2. quick charging system according to claim 1, it is characterized in that, the output of the described input of MOSFET high-frequency drive module, the input of IGBT drive module and current-voltage sampling and signal processing module all with DSP Digital Control model calling, wherein current-voltage sampling and signal processing module are specially three, and its input is connected with high-frequency inversion module, Inverter Unit and Boost boost module respectively;
Described MOSFET high-frequency drive module is specially 2, and its output is connected with high-frequency inversion module and Boost boost module respectively.
3. quick charging system according to claim 1, is characterized in that, described Boost boost module is made up of boost chopper, and described positive negative pulse stuffing generation module comprises positive pulse output circuit and negative pulse output circuit.
4. quick charging system according to claim 1, is characterized in that, described Inverter Unit adopts the topological structure of voltage-type full-bridge inverter.
5. quick charging system according to claim 1, it is characterized in that, described four stages quick charge control circuit realizes precharge, positive negative pulse stuffing quick charge by DSP Digital Control module controls, supplies charging and floating charge four-stage fast pulse charger.
6. quick charging system according to claim 5, is characterized in that, is specially:
Stable low current precharge is adopted to battery, when making cell voltage progressively rise to the threshold value accepting large current charge, enters positive negative pulse stuffing quick charge;
Forward big current and negative-going pulse is adopted to carry out positive negative pulse stuffing quick charge, control to be switched to when battery both end voltage rises to certain value to supply the charging stage, this stage adopts constant voltage charge, and charging current reduces gradually, when electric current drops to a certain threshold value, forward the floating charge stage to.
7. quick charging system according to claim 1, it is characterized in that, described frequency conversion positive negative pulse stuffing produces circuit by detecting charge condition of battery, the charging current of charging pulse is changed in real time and charging pulse frequency realizes effectively modulating the positive negative pulse stuffing in charging process according to cell voltage, namely with high-frequency impulse, low-frequency pulse is modulated, the intensity of unit pulse is periodically switched between strong and weak and positive and negative, because frequency conversion electric current is modulated original charging current and discharging current, the intensity of unit pulse is periodically switched between high-frequency impulse and low-frequency pulse.
8. quick charging system according to claim 1, it is characterized in that, described frequency conversion positive negative pulse stuffing produces circuit and regulates in real time frequency conversion positive negative pulse stuffing, by IGBT drive module, the low and high level that assigned I/O port exports is amplified, opening and shutting off of control IGBT pipe, thus realize the output of positive pulse electric current and negative pulse current, by the anti-battery reversal connection of diode, control negative pulse discharge direction.
9. quick charging system according to claim 1, it is characterized in that, described negative pulse discharge energy feedback circuit adopts energy feedback type electronic load topology, the negative pulse produced is inputted electrical network amplitude and the consistent output of phase place by boosting and inversion generation and industrial frequency AC, and and net of wiring back.
10. a kind of high power digital frequency conversion positive negative pulse stuffing quick charging system based on energy feedback according to claim 1, is characterized in that, described Inverter Unit controls turning on and off of single-phase grid-connection inverter circuit MOSFET by SPWM.
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