CN106972595B - Unmanned aerial vehicle lithium polymer power battery pack hybrid charging system - Google Patents
Unmanned aerial vehicle lithium polymer power battery pack hybrid charging system Download PDFInfo
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- CN106972595B CN106972595B CN201710383632.4A CN201710383632A CN106972595B CN 106972595 B CN106972595 B CN 106972595B CN 201710383632 A CN201710383632 A CN 201710383632A CN 106972595 B CN106972595 B CN 106972595B
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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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
- H02J7/007—Regulation of charging or discharging current or voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention discloses a hybrid charging system of a lithium polymer power battery pack of an unmanned aerial vehicle. The battery pack discharging line change-over switch comprises a DC power input end, a battery pack discharging line change-over switch, a battery pack balancing line change-over switch and a sampling change-over switch, wherein the DC power input end is connected with the battery pack discharging line change-over switch, the buck-boost charging output end is connected with an independent balancing charging circuit power switch, the independent balancing charging circuit power switch is connected with the battery pack balancing line change-over switch, the DC power input end is connected with a singlechip, the singlechip is connected with an independent charging circuit and a solid-state relay, the buck-boost charging output end and the independent charging output sampling end are connected with the sampling change-over switch, the singlechip is connected with the sampling change-over switch, and the singlechip is connected with the buck-boost charging circuit and the independent charging circuit. The advantages are that: the problem that the bypass balance charging current is small in charging balance current and serious in heating is solved, the independent balance charging current is large in charging balance current and does not heat but is small in charging current is solved, the service life of the battery is prolonged, and the old battery is enabled to have enough power.
Description
Technical Field
The invention relates to a charging system of an unmanned aerial vehicle battery, in particular to a hybrid charging system of a lithium polymer power battery pack of an unmanned aerial vehicle.
Background
The current commercial unmanned aerial vehicle's rising has brought huge convenience for industries such as take photo by plane, survey and drawing, security protection, electric power erection and inspection, agriculture plant protection in addition, but current commercial unmanned aerial vehicle's power battery is lithium polymer battery, and duration is not more than half an hour, in order not to influence the operation, goes out the operation and need carry a plurality of group batteries or chargers that have fully charged. The charging commonly used in the prior art is a balanced charger, and the balanced charger currently on the market is generally a series bypass balanced charger balanced by a power line charging balanced line and an independent charger charged by the balanced line.
The series-charging bypass type balance is added with a balance function, namely a balance circuit formed by a resistor and an MOS tube is connected in parallel on each battery cell to realize balance charging; the independent balance charging utilizes the complete independent multipath switching power supply to charge and replay different battery cores in a group of batteries, and each battery is provided with an independent charging loop for charging, so that each unit of the battery pack is really charged independently, and the independent control is realized without mutual influence.
Although the above charging methods have advantages, they still have the following drawbacks, and the serial charging method has serious damage to the battery because the internal resistance and other parameters of each battery of the battery pack cannot be consistent, and the battery serial charging method cannot avoid phenomena of single overcharge and undercharge. The balance function of the series charging bypass balance is that the bypass formed by the resistor and the MOS tube replaces the corresponding full battery cell to pass current, the energy consumption causes heating on the bypass, the charging current is 0.5A, the single bypass heating power reaches 2W, the heating is serious, the maximum current can not exceed 0.5A when in balance, the independent balance charging is carried out, because each battery is provided with an independent charging loop for charging, only the balance wire end of the battery pack can be used as a charging port, but the balance wire end of the battery pack is thinner, the wire end loss is larger when the charging current exceeds 6A, the heating is easy, the current can not be filled, the charging time is increased, in other words, in the charging mode in the current market, each battery cell has rated voltage, if one battery is charged, the total voltage is considered, but because the inner battery cell is unbalanced, one battery cell can possibly exceed the rated voltage, then the explosion is caused, the problem of charging each battery cell needs to be considered, each battery cell reaches the rated voltage, and finally the total full voltage (namely the rated voltage value) is reached. Then how to balance and how to sense which cell is full is automatically switched to another cell for charging is also a problem to be solved.
In addition, in the above charging mode, the battery capacity detection mode is too long, the existing charging interface is provided with different charging sockets for battery packs with different numbers of sections, and the circuits among the batteries of the sockets are connected in parallel, so that when a user inserts the batteries with different numbers of sections at the same time, the charging and discharging among the batteries are caused; the mechanical relay has defects that although the mechanical relay can be used for excessively high current and cutting off signals, the mechanical relay has sound, mechanical abrasion and switching time life when being switched; the existing photo-MOS tube can only pass through a small-current signal source and cannot pass through a large-current circuit with upper amperes although the photo-MOS tube has no mechanical switch abrasion and switch time life limitation.
Disclosure of Invention
The invention aims to solve the technical problem of providing the unmanned aerial vehicle lithium polymer power battery pack hybrid charging system which can solve the problems of low heating caused by bypass balance charging current and charging balance current and the problems of high heating caused by independent balance charging current and low charging current.
In order to solve the technical problems, the unmanned aerial vehicle lithium polymer power battery pack hybrid charging system comprises a DC power input end for power input, a battery pack discharging line change-over switch, a battery pack balancing line change-over switch and a sampling change-over switch for controlling sampling signals of a plurality of sampling ends, wherein the DC power input end is connected with the input end of the battery pack discharging line change-over switch through a buck-boost charging circuit and a solid-state relay, the buck-boost charging output end of the buck-boost charging circuit is connected with an independent balancing charging circuit power switch, the independent balancing charging circuit power switch is connected with the battery pack balancing line change-over switch through an independent charging circuit, the DC power input end is also connected with a singlechip through a power management circuit, one port of the singlechip is connected with the independent charging circuit, the other port is connected with the solid-state relay through the solid-state relay control switch, the independent charging output sampling end of the independent charging output circuit is also connected with the sampling change-over switch through the buck-boost charging output sampling end, and the singlechip is also connected with the sampling change-over switch mutually and can process the sampling AD value controlled and charge through the sampling change-over switch, and the conversion can be controlled according to the processing result, and the conversion result is also connected with the singlechip through the buck-boost charging circuit and the PID circuit respectively.
The solid state relay is a 30A solid state relay, and the solid state relay can be switched between series charging and independent charging through a solid state relay control switch.
The independent charging circuit is an independent charging circuit of more than one independent circuit, and the independent charging circuit can independently charge a plurality of battery cells of one battery through a balance line.
According to the unmanned aerial vehicle lithium polymer power battery pack hybrid charging system, batteries are charged in series through high current of power lines (all the battery cells are not fully charged at the moment), and then multiple paths of independent power supplies are automatically switched to independently charge all the battery cells through balance lines (all the battery cells are fully charged at the moment and are in a balanced charging state).
According to the unmanned aerial vehicle lithium polymer power battery pack hybrid charging system, a charger is connected with a plurality of ports, the battery voltage of each port is scanned and detected to charge, and the port of the battery which is full of the battery at the current port is switched to be automatically charged.
The invention has the advantages that: the independent multi-loop charging system controlled by the single chip microcomputer is intelligent and flexible in the whole control process, the battery packs can be controlled by utilizing the MOS tube switch effect to realize simultaneous or alternate charging of the battery packs, and parameters such as voltage, current and capacity of each battery in the whole process are displayed, so that the series charging and independent balanced charging modes of the battery packs are combined together by utilizing the single chip microcomputer to control the solid state relay circuit, the advantages of high-current quick charging and independent balanced charging of series charging are fully exerted, the independent control and mutual noninterference are achieved, the high-current charging of a power line is started, the automatic switching into the independent charging of a balance line during balancing, the perfect combination of 30A high-current charging and 6A balancing is realized, the serious problem of low heating of bypass balance charging current is solved, the independent balance charging balance current is high, the heating is low, the balance of the balance charging current is high, the service life of the battery is prolonged, the old battery is also high in power, and the comprehensive time cost and the purchase cost of the battery are greatly lower than that of the traditional balance charging.
Drawings
Fig. 1 is a schematic block diagram of a hybrid charging system for a lithium polymer power battery of an unmanned aerial vehicle according to the present invention.
Detailed Description
The hybrid charging system for the unmanned aerial vehicle lithium polymer power battery pack according to the invention is further described in detail below with reference to the accompanying drawings and the detailed description.
As shown in the figure, the unmanned aerial vehicle lithium polymer power battery pack hybrid charging system comprises a DC power input end for power input, a battery pack discharging line change-over switch, a battery pack balancing line change-over switch and a sampling change-over switch for controlling sampling signals of a plurality of sampling ends, wherein the DC power input end is connected with the input end of the battery pack discharging line change-over switch through a buck-boost charging circuit and a solid-state relay, the buck-boost charging output end of the buck-boost charging circuit is connected with an independent balancing charging circuit power switch, the independent balancing charging circuit power switch is connected with the battery pack balancing line change-over switch through an independent charging circuit, the DC power input end is also connected with a singlechip through a power management circuit, one port of the singlechip is connected with the independent charging circuit, the other port is connected with the solid-state relay through a solid-state relay control switch, the single chip microcomputer is also connected with the buck-boost charging circuit and the independent charging circuit respectively through a plurality of PID (proportion integration differentiation) regulation, wherein the solid state relay circuit has the advantages of inheriting a mechanical relay and an optical MOS (metal oxide semiconductor) tube, can pass through the current of tens of amperes, can isolate the signal interference of different power supply loops, and has no mechanical loss and no limitation of the service life of the switch; through the structural design, the solid-state switch is used for thoroughly isolating the independent charging circuit during serial charging, the independent charging port is opened to detect the voltage of each battery during detection, and the solid-state switch is used for thoroughly isolating the circuit during serial charging under the independent balanced charging state.
Further, the relay is a 30A solid state relay, the relay can be used for increasing current, and the solid state relay can be switched between series charging and independent charging through a solid state relay control switch.
The independent charging circuit is a charging circuit of more than one independent loop, and the charging circuit can independently charge a plurality of battery cores of one battery (formed by connecting a plurality of battery cores in series) through a balance wire, so that the independent charging circuits are not mutually interfered.
By adopting the structure, on one hand, the input end of the battery discharging line change-over switch is connected after passing through the step-up and step-down charging circuit and the solid-state relay from the DC power supply input end, so that the battery discharging head can be connected to the battery discharging line change-over switch, the power line of the battery discharging head is utilized for charging, the adopted power line is used for charging, the charging current is high, the charging speed is high, the durability of the line is ensured, and in addition, the charging process can be intelligently switched through the control of the singlechip and the change-over of the sampling change-over switch to be used for charging by the balance line. When the balance line is charged, the power line automatically stops working, and the scheme forms a hybrid charging mode; in addition, in the charging process, when one cell is full through the control of the singlechip and the conversion of the sampling conversion switch, other cells are automatically switched to charge, and an automatic switching charging function, also called a nurse function, is completed.
According to the analysis, the purpose that the battery is charged in series through the large current of the power line (all the battery cells are not fully charged at the moment) and then is automatically switched into the multi-channel independent power supply to independently charge each battery cell through the balance line (the battery cells are fully charged at the moment and are in a balanced charging state) is achieved by adopting the structure.
The practice proves that the whole process from charging to balancing is realized at high speed, the charging average time of the charging current is half of that of bypass balancing charging, the efficiency of the old battery is improved by a plurality of times, and the balancing process has no energy loss and is environment-friendly. The balance of the independent balance is far higher than that of the bypass balance, and the service life of the battery is greatly prolonged. The economic hybrid charger doubles both the charging time efficiency and the extended battery life relative to bypass balanced charging. The automatic switching of a plurality of groups of batteries realizes no waiting for charging and ensures no working time loss of the charger.
Compared with the independent balanced charging maximum 6A charging current, the 30A high-current serial charging speed is improved by 4 times and even higher, and the waiting time of the 10AH high-capacity battery for the value protector is greatly shortened.
Hybrid charging combines multiple automatic switching. No matter the charging speed, the energy efficiency and the service life of the battery are obviously improved. The method realizes the charging while flying without filling a plurality of batteries in advance, reduces the purchase quantity of the batteries, does not wait because the batteries are not pre-charged, and can operate at any time.
Claims (5)
1. An unmanned aerial vehicle lithium polymer power battery group hybrid charging system, its characterized in that: the DC power supply input end is connected with the input end of the battery discharging line change-over switch through a step-up and step-down charging circuit and a solid-state relay, the step-up and step-down charging output end of the step-up and step-down charging circuit is connected with the power switch of the independent balancing charging circuit, the power switch of the independent balancing charging circuit is connected with the battery balancing line change-over switch through the independent charging circuit, the DC power input end is also connected with a singlechip through a power management circuit, one port of the singlechip is connected with the independent charging circuit, the other port is connected with the solid-state relay through a solid-state relay control switch, the step-up and step-down charging output end is connected with the sampling change-over switch through the step-up and step-down charging output end, the independent charging output end of the independent charging output circuit is also connected with the sampling change-over switch, a port is connected with the sampling change-over switch mutually and can process the AD value controlled to be input through the sampling change-over switch according to the processing result, and the singlechip is also connected with the independent charging circuit through the step-up and step-down charging circuit.
2. The unmanned aerial vehicle lithium polymer power battery hybrid charging system of claim 1, wherein: the solid state relay is a 30A solid state relay, and the solid state relay can be switched between series charging and independent charging through a solid state relay control switch.
3. The unmanned aerial vehicle lithium polymer power battery hybrid charging system of claim 1, wherein: the independent charging circuit is an independent charging circuit of more than one independent circuit, and the independent charging circuit can independently charge a plurality of battery cells of one battery through a balance line.
4. The unmanned aerial vehicle lithium polymer power battery hybrid charging system of claim 1, wherein: firstly, charging batteries in series through large current of a power line, wherein all battery cores are not fully charged; and then, automatically switching into a plurality of paths of independent power supplies to independently charge each battery cell through the balance line, wherein the battery cells are full of electricity at the moment and are in a balanced charging state.
5. The unmanned aerial vehicle lithium polymer power battery hybrid charging system of claim 1, wherein: the charger is connected with a plurality of ports, scans and detects the battery voltage charging of each port, and switches to the port of the battery which is not full to be charged after the battery of the current port is full.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710383632.4A CN106972595B (en) | 2017-05-26 | 2017-05-26 | Unmanned aerial vehicle lithium polymer power battery pack hybrid charging system |
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| CN201710383632.4A CN106972595B (en) | 2017-05-26 | 2017-05-26 | Unmanned aerial vehicle lithium polymer power battery pack hybrid charging system |
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| CN106972595A CN106972595A (en) | 2017-07-21 |
| CN106972595B true CN106972595B (en) | 2023-10-20 |
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| CN110770961A (en) * | 2018-05-31 | 2020-02-07 | 深圳市大疆创新科技有限公司 | Power management system, battery, charger and unmanned aerial vehicle |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437619A (en) * | 2011-12-31 | 2012-05-02 | 广州市香港科大霍英东研究院 | Bidirectional balanced circuit of power battery pack |
| CN205248881U (en) * | 2015-12-07 | 2016-05-18 | 重庆瑞升康博电气有限公司 | Unmanned aerial vehicle intelligent charging machine |
| CN205753514U (en) * | 2016-05-16 | 2016-11-30 | 哈瓦国际航空技术（深圳）有限公司 | A kind of balancing charging apparatus of series-connected cell |
| CN207234430U (en) * | 2017-05-26 | 2018-04-13 | 深圳市乐迪电子有限公司 | Unmanned plane lighium polymer power battery pack mixed charged system |
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2017
- 2017-05-26 CN CN201710383632.4A patent/CN106972595B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437619A (en) * | 2011-12-31 | 2012-05-02 | 广州市香港科大霍英东研究院 | Bidirectional balanced circuit of power battery pack |
| CN205248881U (en) * | 2015-12-07 | 2016-05-18 | 重庆瑞升康博电气有限公司 | Unmanned aerial vehicle intelligent charging machine |
| CN205753514U (en) * | 2016-05-16 | 2016-11-30 | 哈瓦国际航空技术（深圳）有限公司 | A kind of balancing charging apparatus of series-connected cell |
| CN207234430U (en) * | 2017-05-26 | 2018-04-13 | 深圳市乐迪电子有限公司 | Unmanned plane lighium polymer power battery pack mixed charged system |
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