CN104393658A - Energy management circuit - Google Patents
Energy management circuit Download PDFInfo
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- CN104393658A CN104393658A CN201410655158.2A CN201410655158A CN104393658A CN 104393658 A CN104393658 A CN 104393658A CN 201410655158 A CN201410655158 A CN 201410655158A CN 104393658 A CN104393658 A CN 104393658A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/10—Control circuit supply, e.g. means for supplying power to the control circuit
Abstract
The invention discloses an energy management circuit. The energy management circuit comprises a preprocessing module, a first energy storage module, a control module, a charging management module and a second energy storage module, wherein the preprocessing module is used for preprocessing an input electric signal; the first energy storage module is used for collecting and storing energy from the preprocessed electric signal; the control module is used for controlling power supply on or off of the first energy storage module to backward-stage modules according to the state of the first energy storage module; the energy management module is used for modulating the electric energy released by the first energy storage module so as to stably charge the second energy storage module; the second energy storage module is used for storing the electric energy input by the energy management module so as to supply power to a load. The energy management circuit is capable of performing modulation and energy management on all output electric signals, and is wide in application range.
Description
Technical field
The present invention relates to micro-nano energy collection technical field of memory, be specifically related to a kind of energy management circuit, is a kind of completely self-driven novel energy management circuit from controlling that the signal of telecommunication intermittently can be stored in energy storage module.
Background technology
Friction generator is another important energy collection technology after belonging to relay magnetic generator and piezoelectric generator, and it utilizes the coupling of triboelectrification effect and electrostatic induction, and mechanical energy ubiquitous in surrounding environment is converted to electric energy.According to the difference of mechanism of power generation, friction generator is mainly divided into two large classes: separate formula and planer sliding type.Output except rotary friction generator is sinusoidal wave signal, and the output of other friction generator is ultrashort pulse AC signal.The output of most friction generator all has a common feature: high voltage low current low-power.
At present, typical friction generator energy management circuit is primarily of transformer, rectifier bridge, filter capacitor, voltage-stabiliser tube and electric capacity composition, but because capacitance is limited, during electric discharge, electric current and voltage is unstable simultaneously, this, for the commercial electronic equipment that the overwhelming majority needs constant pressure and flow to power, is difficult to be on the actual application.In addition, voltage reduction method for friction generator High voltage output comprises electric capacity connection in series-parallel step-down and transformer pressure-reducing method, these two kinds of methods all have self limitation, wherein, the limitation of electric capacity connection in series-parallel voltage drop method is, will use a large amount of electric capacity, be not easy to integrated when step-down multiplying power is larger, simultaneously the connection in series-parallel of electric capacity connects needs people to be manual switchover, and therefore this voltage reduction method will hinder the industrialization of friction generator and greatly in self-driven application in control system; For transformer pressure-reducing method, because the power consumption of transformer is low to moderate the power of milliwatt rank and Yan Tai great for most non-rotating friction generator, the even whole energy of the overwhelming majority of friction generator all by loss on the transformer, visible for most friction generator, transformer pressure-reducing method is not applicable.
Summary of the invention
In order to solve conventional friction generator energy management circuit power consumption large, be not easy to integrated, cannot from controlling and really can not being applicable to the problems such as commercial electronic product, the object of this invention is to provide a kind of novel energy management circuit, this circuit forms primarily of chip, integrated to facilitate, this makes the industrialization of friction generator step forward major step, high voltage simultaneously for friction generator exports, the present invention takes the mode of not step-down for the consideration of power consumption, and final choice rechargeable lithium ion batteries is as final energy memory device.During due to lithium ion battery powering load, electric current and voltage is stable and Capacity Ratio electric capacity is much bigger, so energy management circuit of the present invention has low-power consumption, completely self-driven from controlling, and is convenient to integrated and advantage that is industrialization.
The present invention proposes a kind of energy management circuit, this energy management circuit comprises: pretreatment module, the first energy storage module, control module, energy management module and the second energy storage module, wherein:
Described pretreatment module is used for carrying out preliminary treatment for the signal of telecommunication of input;
Described first energy storage module is connected with described pretreatment module, for carrying out collection of energy and storage to through the pretreated signal of telecommunication;
Described control module is connected with described first energy storage module, for controlling the power supply break-make of described first energy storage module for post-module according to the state of described first energy storage module;
Described energy management module is connected with described control module, for modulating the electric energy of described first energy storage module release, to carry out constant charge to described second energy storage module;
Described second energy storage module is connected with described energy management module and load, for storing the electric energy of described energy management module input, thinks load supplying.
Wherein, described pretreatment module comprises rectification module and/or filtration module, and wherein, described rectification module is the rectifier bridge be made up of multiple diode, and described filtration module comprises two electric capacity in parallel.
Wherein, described diode reverse recovery time the < signal of telecommunication cycle.
Wherein, the capacity of two electric capacity in described filtration module is different, and wherein, the capacity of large bulk capacitance is greater than 1 μ F, and the capacity of low capacity electric capacity is less than 1nF, and ratio >=1000 of the capacity of large bulk capacitance and the capacity of low capacity electric capacity.
Wherein, described first energy storage module comprises at least one storage capacitor, the capacitance >=500 μ F of described storage capacitor, and leakage current is less than 10 μ A, and power consumption is less than 10 μ W.
Wherein, when the signal of telecommunication inputted is high-voltage signal, the electric capacity in the puncture voltage of described diode, described filtration module and the withstand voltage of described storage capacitor all >=500V.
Wherein, described control module comprises signal controlling module and switch module, wherein:
Described signal controlling module is used for exporting corresponding control signal according to the voltage levels state of described first energy storage module to described switch module;
Described switch module is used for controlling the power supply break-make of described first energy storage module for subsequent module according to received control signal.
Wherein, described signal controlling module is two hysteresis comparator chips, and described switch module is switch chip, and the starting power of described pair of hysteresis comparator chip and switch chip is all less than the power output of storage capacitor.
Wherein, described energy management module at least comprises interrupted charging management chip, and the starting power of described interrupted charging management chip is less than the power output of storage capacitor.
Wherein, described second energy storage module is rechargeable lithium ion batteries.
Except friction generator, the collection of energy management and solar energy that the above-mentioned energy management circuit that the present invention proposes is suitable for piezoelectric generator equally stores, that is, energy management circuit of the present invention both can be modulated and energy management high voltage, low current, the low-power signal of telecommunication, also can to low-voltage, high electric current, the high power signal of telecommunication or other signal of telecommunication is modulated and energy management.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of energy management circuit of the present invention;
Fig. 2 is the electrical block diagram of energy management circuit according to an embodiment of the invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 1 is the structured flowchart of energy management circuit of the present invention, and as shown in Figure 1, described energy management circuit comprises: pretreatment module, the first energy storage module, control module, energy management module and the second energy storage module, wherein:
Described pretreatment module is used for carrying out preliminary treatment for the signal of telecommunication of input, obtains through the pretreated signal of telecommunication;
Wherein, described pretreatment module comprises rectification module and/or filtration module, and described rectification module is used for carrying out rectification for the ac signal of input, obtains DC signal; Described filtration module is used for carrying out filtering for input electrical signal, with filtering noise wherein.Those skilled in the art can understand, and when the signal of telecommunication inputted is ac signal, need rectification module first to carry out rectification process to ac signal; If but when the signal of telecommunication of input is DC signal, without the need to rectification module, can directly use filtration module to carry out filtering for DC signal.
Described first energy storage module is connected with described pretreatment module, carries out collection of energy and storage for the signal of telecommunication exported described pretreatment module;
Described control module is connected with described first energy storage module, for controlling the power supply break-make of described first energy storage module for post-module according to the state of described first energy storage module;
Described energy management module is connected with described control module, for modulating the electric energy of described first energy storage module release, to carry out constant charge to described second energy storage module;
Described second energy storage module is connected with described energy management module and load, for finally storing the electric energy of input, thinks that load is powered.
Fig. 2 is the electrical block diagram of energy management circuit according to an embodiment of the invention, in theory, described energy management circuit can carry out energy management for all signals of telecommunication, it not only can carry out energy management for common signals of telecommunication such as sinusoidal electric signals, the sawtooth signals of telecommunication, can also carry out energy management for non-common signals of telecommunication such as pulse electrical signal, the short pulse signals of telecommunication; Not only can carry out energy management for low pressure high power signals, energy management can also be carried out for high pressure low-power signal.For convenience's sake, the high-voltage pulse ac signal that the present embodiment exports for friction generator, be described, but energy management circuit of the present invention is not limited only to this for energy management circuit of the present invention.As shown in Figure 2:
In the present embodiment, described rectification filtering module comprises rectification module and filtration module, further, described rectification module is the rectifier bridge be made up of multiple diode, the rectifier bridge be such as made up of four diodes D1, D2, D3, D4, particularly, in this embodiment, the positive pole of the first diode D1 is connected with the negative pole of the 3rd diode D3, and the node of generation is connected with friction generator output; The positive pole of the second diode D2 is connected with the negative pole of the 4th diode D4, the node produced is connected with another output of friction generator, the negative pole of the first diode D1 is connected with the negative pole of the second diode D2, the node produced is connected with the positive pole of subsequent module, the positive pole of the 3rd diode D3 is connected with the positive pole of the 4th diode D4, the node ground connection of generation.Wherein, the puncture voltage >=500V of described diode, reverse recovery time < ac signal cycle.Certainly, described rectification module also can adopt the rectifier bridge module of mass production.The present invention does not do concrete restriction for the specific implementation form of rectification module, allly all can fall within the scope of protection of the present invention the rectification module that input electrical signal carries out DC rectifier.
Wherein, the output signal due to most friction generator is the short pulse AC signal of high-frequency and high-voltage, and the diode therefore forming described rectifier bridge need select high voltage bearing fast recovery diode, such as diode FR607.Voltage higher than 500V is defined as high pressure by the present invention; Be less than friction generator the reverse recovery time that described fast recovery refers to adopted diode and exchange the cycle exporting the signal of telecommunication, the cycle that interchange due to most of friction generator exports the signal of telecommunication is a few nanosecond, therefore in an embodiment of the present invention, the reverse recovery time that described fast recovery refers to adopted diode is less than or equal to a nanosecond.
The ac signal that described friction generator exports is after described rectification module, and be rectified into the pulse direct current signal of telecommunication, this pulse direct current signal of telecommunication is exported to described filtration module by described rectification module.
In an embodiment of the present invention, described filtration module comprises two electric capacity C1 and C2 in parallel, wherein, the positive pole of the first electric capacity C1 is connected with one end of the second electric capacity C2, the node formed is connected with the negative pole of the second diode D2 with the first diode D1 of described rectification module, the negative pole of the first electric capacity C1 is connected with the other end of the second electric capacity C2, the node ground connection of formation.In the present embodiment, the output signal due to most friction generator is the short pulse AC signal of high-frequency and high-voltage, and therefore, described electric capacity elects high pressure resistant electric capacity as, its withstand voltage >=500V, is preferably >=1000V.In an alternative embodiment of the invention, the withstand voltage of described electric capacity C1 and C2 is 1000V, go for the High voltage output of friction generator, filter effect simultaneously in order to ensure, the amount of capacity of two electric capacity C1 with C2 is different, preferably differ larger, wherein, the capacity of large bulk capacitance is greater than 1 μ F, be mainly used in filtering low-frequency interference signal, the capacity of low capacity electric capacity is less than 1nF, be mainly used in filtering high-frequency signal, and ratio >=1000 of the capacity of large bulk capacitance and the capacity of low capacity electric capacity, such as large bulk capacitance can select model to be the electric capacity of 1000V/10 μ F, low capacity electric capacity can select model to be the electric capacity of 1000V/0.1nF.
The DC signal that described rectification module exports, after the filtering process of described filtration module, obtains the relatively level and smooth signal of telecommunication, so that the first energy storage module being positioned at rear class carries out collection of energy to it.
In an embodiment of the present invention, described first energy storage module comprises at least one storage capacitor C3, wherein, described storage capacitor C3 is the low electric capacity of high pressure resistant vast capacity leakage current low power consumption, particularly, the withstand voltage >=500V of described storage capacitor C3, is preferably >=1000V; Capacitance >=500 μ F, is preferably >=1000 μ F, and model such as can be selected to be the electric capacity of 1000V/680 μ F; Leakage current is less than 10 μ A (output current of most of friction generator is tens μ A); Power consumption is less than 10 μ W (instantaneous power of most of friction generator is tens μ W).Wherein, the selection of storage capacitor C3 vast capacity is the consideration for its driving force, a core difficult point of friction generator collection of energy is exactly that the efficiency of energy collection of energy collection module is on the low side, the obtainable electric energy of institute in the unit interval will be caused so to be still not enough to driving the low-power consumption even power consumption equipment of super low-power consumption, and the control module at rear and energy management module all need certain electric energy to be driven, therefore, energy collection module must use jumbo electric capacity to carry out primary energy storage, enough electric energy can be run up to, then follow-up electricity consumption module can just be driven, that is, only have the capacity of storage capacitor enough large, the charge storage ability that guarantee is enough, and then guarantee effectively to drive subsequent module work, the high voltage bearing selection of storage capacitor C3 is for the consideration for friction generator High voltage output, consider the efficiency of energy collection of energy management circuit, storage capacitor C3 also needs to have the advantages that leakage current is little and loss is little.
Certainly, described first energy storage module also can adopt other energy storage devices, and the present invention does not do concrete restriction to it, as long as it can effectively collect and store the energy of input electrical signal.
In an embodiment of the present invention, described control module comprises signal controlling module and switch module, wherein:
Described signal controlling module is used for exporting corresponding control signal according to the voltage levels state of described first energy storage module to described switch module;
Described switch module is used for controlling the power supply break-make of described first energy storage module for subsequent module according to received control signal.
In an embodiment of the present invention, described signal controlling module adopts two hysteresis comparator chip IC L7665, and described switch module adopts switch chip CD4051, and these two kinds of chips all belong to the conventional chip in this area, for the structural parameters that it is concrete, the present invention repeats no more.Certainly, described signal controlling module and switch module also can adopt other control devices and switching device, and the present invention does not do concrete restriction to it, as long as it accurately can control the power supply break-make of the first energy storage module for post-module.
Described control module controls storage capacitor C3 electric discharge or stops electric discharge continuing a key component of electric power storage, if there is no control module, just can not external any load on storage capacitor C3, as long as because be connected to load, the electric energy that the electric energy that load consumes in the unit interval all will be greater than the first energy storage module and collects in the unit interval, particularly, because the instantaneous output of most of friction generator is the highest only have tens μ W, if load to be directly connected to the two ends of storage capacitor C3, because the consumed power of load will reach mW rank, storage capacitor C3 will be made like this to actually appear clean electric discharge.
Wherein, described signal controlling module is high level signal or low level signal to the control signal that described switch module sends, further, described signal controlling module is selected to export high level signal or low level signal to described switch module by the voltage detecting storage capacitor C3 two ends, such as, if the voltage at described storage capacitor C3 two ends is higher than a threshold test voltage, then described signal controlling module is to described switch module output low level signal; Otherwise if the voltage at described storage capacitor C3 two ends is lower than described threshold test voltage, then described signal controlling module exports high level signal to described switch module; Particularly, for two hysteresis comparator chip IC L7665, by arranging its divider resistance R1, R2, the resistance (as shown in Figure 2) of threshold test resistance R3 arranges described threshold test voltage.In an embodiment of the present invention, described threshold test voltage is set to 5V, namely when the voltage at described storage capacitor C3 two ends is greater than 5V, the output OUT1 output low level signal of two hysteresis comparator chip IC L7665, on the contrary, when the voltage at described storage capacitor C3 two ends is less than 5V, the output OUT1 of two hysteresis comparator chip IC L7665 exports high level signal.
The effect of described switch module is exactly that what exported by detection signal control module is the break-make that high level signal or low level signal control self, such as, if what described switch module detected that signal controlling module exports is low level signal, then switch module conducting is (for switch chip CD4051, being pin one 3 to be communicated with pin O/I) whole energy management circuit is in channel status, thus realizes the power supply of described storage capacitor C3 for subsequent module; On the contrary, if described switch module detects that signal controlling module exports is high level signal, then switch module disconnects, and whole energy management circuit is in open-circuit condition, and now described storage capacitor C3 only charges and do not power.
Further, the starting power of described couple of hysteresis comparator chip IC L7665 and switch chip CD4051 is all less than the power output of storage capacitor C3.
In an embodiment of the present invention, described energy management module at least comprises interrupted charging management chip.
Output due to most friction generator is that discontinuous pulse electrical signal and power output are very low, the both end voltage of storage capacitor C3 just starts electric discharge when reaching 5V, and the discharge power of storage capacitor C3 is more much bigger than the power output of friction generator, above factor will inevitably cause the electric discharge of storage capacitor C3 to be desultory, therefore, the discharge and recharge for storage capacitor C3 is needed to manage.
Interrupted charging management chip is very harsh for the requirement of its minimum condition of work, namely must reach requirement in operating voltage and operating current all simultaneously, and ensure continue to when, interrupted charging management chip could normally work, otherwise, interrupted charging management chip not only can not work, also can be clean by chip leakage current consumption by the energy stored by storage capacitor C3, therefore the present invention chooses interrupted charging management chip and manages for the discharge and recharge of described storage capacitor C3, the electric energy discharged by described storage capacitor C3 stores again, to ensure the stability for described second energy storage module charging current.
CN3153 is a kind of single-unit lithium ion cell charging managing chip supporting interrupted charging, it is the special input voltage source for utilizing output current limited in one's ability carries out Charge Management chip to single-unit lithium ion battery, the power transistor of chip internal carries out constant current and constant voltage charge to the battery of chip internal, charging current can utilize non-essential resistance to programme and set, maximum lasting charging current can reach 1A, and does not need to add choked flow diode and current sense resistor in addition.Certainly, described energy management module also can adopt other Charge Management devices, and the present invention does not do concrete restriction to it, as long as it can ensure the stability for described second energy storage module charging current.
Further, the starting power of described interrupted charging management chip CN3153 is less than the power output of storage capacitor C3.
In addition, in order to ensure that interrupted charging management chip CN3153 can normally work, necessary peripheral discrete component is absolutely necessary, and as shown in Figure 2, electric capacity C4 is the shunt capacitance of charging management chip power input; In order to ensure that charging management chip CN3153 normally works, need to hold contact resistance R6 and electric capacity C5 between (BAT end belongs to a pin of interrupted charging management chip CN3153, and this pin is used for being directly the charging of subsequent power memory module) to GND at the BAT of interrupted charging management chip CN3153; Conveniently observe the charge condition of interrupted charging management chip CN3153, respectively in the charged state indication end of interrupted charging management chip CN3153 simultaneously
with charging done state indication end
connection status indicator light, the such as status indicator lamp of a red LED and a green LED, and resistance R4 is the current-limiting resistance of these two LED state indicator lights; Meanwhile can adjust the charging voltage of interrupted charging management chip CN3153 for rear class second energy storage module by the resistance of regulating resistance R5.
In an embodiment of the present invention, described second energy storage module adopts rechargeable lithium ion batteries, and described rechargeable lithium ion batteries for storing the electric energy of described second energy storage module input, and is directly powered to the load of rear class.The battery of phase ratio capacitance and other types, described rechargeable lithium ion batteries possesses following characteristics: can stablize energy storage and stablize load supplying, charge maintenance capability ratio capacitance is a lot of by force, energy density is high, pollution-free, and cycle life is high, memory-less effect, quick charge etc.Certainly, described second energy storage module also can adopt other energy storage devices, and the present invention does not do concrete restriction to it, as long as it can stablize energy storage also stably for load supplying.
To sum up, energy management circuit of the present invention can be modulated and energy management all high voltages, low current, the low powder pulsed output signal of telecommunication, is widely used.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an energy management circuit, is characterized in that, this energy management circuit comprises: pretreatment module, the first energy storage module, control module, energy management module and the second energy storage module, wherein:
Described pretreatment module is used for carrying out preliminary treatment for the signal of telecommunication of input;
Described first energy storage module is connected with described pretreatment module, for carrying out collection of energy and storage to through the pretreated signal of telecommunication;
Described control module is connected with described first energy storage module, for controlling the power supply break-make of described first energy storage module for post-module according to the state of described first energy storage module;
Described energy management module is connected with described control module, for modulating the electric energy of described first energy storage module release, to carry out constant charge to described second energy storage module;
Described second energy storage module is connected with described energy management module and load, for storing the electric energy of described energy management module input, thinks load supplying.
2. energy management circuit according to claim 1, it is characterized in that, described pretreatment module comprises rectification module and/or filtration module, wherein, described rectification module is the rectifier bridge be made up of multiple diode, and described filtration module comprises two electric capacity in parallel.
3. energy management circuit according to claim 2, is characterized in that, described diode reverse recovery time the < signal of telecommunication cycle.
4. energy management circuit according to claim 2, it is characterized in that, the capacity of two electric capacity in described filtration module is different, wherein, the capacity of large bulk capacitance is greater than 1 μ F, the capacity of low capacity electric capacity is less than 1nF, and ratio >=1000 of the capacity of large bulk capacitance and the capacity of low capacity electric capacity.
5. energy management circuit according to claim 1, is characterized in that, described first energy storage module comprises at least one storage capacitor, the capacitance >=500 μ F of described storage capacitor, and leakage current is less than 10 μ A, and power consumption is less than 10 μ W.
6. the energy management circuit according to claim 2,4 or 5, is characterized in that, when the signal of telecommunication inputted is high-voltage signal, the electric capacity in the puncture voltage of described diode, described filtration module and the withstand voltage of described storage capacitor all >=500V.
7. energy management circuit according to claim 5, is characterized in that, described control module comprises signal controlling module and switch module, wherein:
Described signal controlling module is used for exporting corresponding control signal according to the voltage levels state of described first energy storage module to described switch module;
Described switch module is used for controlling the power supply break-make of described first energy storage module for subsequent module according to received control signal.
8. energy management circuit according to claim 7, it is characterized in that, described signal controlling module is two hysteresis comparator chips, and described switch module is switch chip, and the starting power of described pair of hysteresis comparator chip and switch chip is all less than the power output of storage capacitor.
9. energy management circuit according to claim 5, is characterized in that, described energy management module at least comprises interrupted charging management chip, and the starting power of described interrupted charging management chip is less than the power output of storage capacitor.
10. energy management circuit according to claim 1, is characterized in that, described second energy storage module is rechargeable lithium ion batteries.
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| CN104979871A (en) * | 2015-06-30 | 2015-10-14 | 傅明尧 | CN3153 chip-based charging protection circuit |
| CN106602687A (en) * | 2015-10-19 | 2017-04-26 | 北京纳米能源与系统研究所 | Energy management method, circuit and device for friction nano-generators |
| CN109082714A (en) * | 2017-06-14 | 2018-12-25 | 北京纳米能源与系统研究所 | Electrostatic spinning system and electrospinning process |
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