CN202260412U - Online monitoring and maintaining charging switch gear of lithium iron phosphate battery pack in communication base station - Google Patents
Online monitoring and maintaining charging switch gear of lithium iron phosphate battery pack in communication base station Download PDFInfo
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- CN202260412U CN202260412U CN2011202822638U CN201120282263U CN202260412U CN 202260412 U CN202260412 U CN 202260412U CN 2011202822638 U CN2011202822638 U CN 2011202822638U CN 201120282263 U CN201120282263 U CN 201120282263U CN 202260412 U CN202260412 U CN 202260412U
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Abstract
The utility model relates to an online monitoring and maintaining charging switch gear of a lithium iron phosphate battery pack in a communication base station; the switch gear comprises the lithium iron phosphate battery pack, a communication base station load and a direct current relay; and the switch gear also comprises an online detection balancing plate, an online switching control plate and a superior monitoring system. The online monitoring and maintaining charging switch gear comprehensively analyzes and processes the balance of the lithium iron phosphate battery pack, the integral over-voltage and under-voltage of the battery pack and the over-voltage and under-voltage of each single battery in the battery pack; and the battery maintenance and the charging control are carried out by adopting a lossless balancing technology and an electronic switch mode. A plurality of N-channel MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors)are adopted for forming a heavy current direct-current electronic switch so that when commercial power is supplied, electric currents are used for charging the battery pack by a direct-current busbar through the direct current relay and the online switching control plate, and when the supply of commercial power fails, the battery pack supplies power to the communication base station load, and simultaneously when the batteries are fully charged, a charging loop is cut off; and the double protection mode of hardware and software is adopted for solving the problem of single battery damage existing in the lithium iron phosphate battery pack in the communication base station.
Description
Technical field
The utility model relates to the cell charge protection device, safeguards charging switchgear especially for the on-line monitoring of the ferric phosphate lithium cell group in the communication base station.
Background technology
At present; The lead-acid batteries that communication base station extensively adopts is as energy-accumulating element; Replaced by ferric phosphate lithium cell, there are certain difference in the use in ferric phosphate lithium cell and lead-acid battery, though the monomer ferric phosphate lithium cell life-span is at present above 2000 times; But protect according to single battery voltage because of the lithium phosphate battery set charge/discharge, so the life-span of battery pack is just closely related with the consistency of cell.Only when the battery performance height was consistent, useful life could be near the level of cell.And under existing technical conditions, the cell consistency of producing is difficult to guarantee this point, therefore need take effective cell balancing to improve the useful life of battery pack.
Please refer to Fig. 2, former employing lead-acid battery is the base station of power supply in support, and dc bus charged the battery when civil power had electricity, and battery discharge is that load provides direct current through dc bus after the civil power power down.Be lower than 44V when under-voltage up to battery voltage, the parting system D.C. contactor.To the not protection of this lead-acid battery single-unit,, then cause the infringement of ferric phosphate lithium cell single battery serious easily if still adopt original pattern to connect the ferric phosphate lithium cell group.
Patent CN 201750183 has described " a kind of communication base station is used the ferric phosphate lithium cell charge protection device ", and this patent provides a kind of automatically controlled mechanical switch.But this pattern fails to consider the overvoltage/undervoltage situation of single-unit ferric phosphate lithium cell, and the equalization problem of this battery pack.Might cause the infringement of ferric phosphate lithium cell single battery equally.
Summary of the invention
The utility model damages serious numerous and diverse situation for the ferric phosphate lithium cell single battery that causes easily that will solve above-mentioned proposition; And the technical problem that produces; Charging switchgear is safeguarded in the on-line monitoring that proposes the ferric phosphate lithium cell group in a kind of communication base station, with the equilibrium of ferric phosphate lithium cell group, and the whole overvoltage/undervoltage that this battery is thin; And the overvoltage/undervoltage situation of each single battery in this battery pack; Carry out comprehensive analysis processing, adopt non-dissipative equalizing technology and electronic switch mode, solved the single battery infringement problem of ferric phosphate lithium cell group in communication base station.
The technical scheme that the utility model provides is:
Charging switchgear is safeguarded in the on-line monitoring of the ferric phosphate lithium cell group in a kind of communication base station; This system comprises the ferric phosphate lithium cell group; The communication base station load; Direct current relay; Said system also comprises online detection balancing disk, in wiretap control board and higher level's supervisory control system, the both positive and negative polarity of the monomer ferric phosphate lithium cell in the detection interface of said online detection balancing disk and the ferric phosphate lithium cell group is connected, and can carry out voltage detecting to each monomer ferric phosphate lithium cell in the ferric phosphate lithium cell group; And generation detects packet; The data transfer interface of online detection balancing disk is connected with the data-interface of described higher level's supervisory control system, and higher level's supervisory control system reads in above-mentioned detection packet and analyze through data-interface, and described electric current output interface at the wiretap control board is connected with the input of described direct current relay; The output of direct current relay is connected with described communication base station load through dc bus; Electric current input interface at the wiretap control board is connected with the positive pole of ferric phosphate lithium cell group, is connected with the control interface of higher level's supervisory control system at the control end of wiretap control board, between ferric phosphate lithium cell group and communication base station dc bus, has played the effect of control connection break-make at the wiretap control board;
Described online detection balancing disk; Be used for detecting in real time each monomer ferric phosphate lithium cell state of ferric phosphate lithium cell group and it is carried out reasonable equilibrium; It is to each monomer ferric phosphate lithium cell; Also to each monomer ferric phosphate lithium cell equilibrium result, carry out real-time tracking and the relevant data such as voltage of record in the time of balanced, simultaneously testing result is sent to higher level's supervisory control system through data transfer interface; After higher level's supervisory control system is analyzed according to the described testing result of online detection balancing disk, through control interface to send corresponding system switching signal at the wiretap control board.
Described online detection balancing disk comprises the detection interface more than at least 2 pairs; Each both positive and negative polarity to a monomer ferric phosphate lithium cell in online detection interface and the ferric phosphate lithium cell group is connected, and online detection balancing disk gathers the testing result of each the monomer ferric phosphate lithium cell in the ferric phosphate lithium cell group after data transfer interface is sent to higher level's supervisory control system in real time.
Describedly comprise N-channel MOS FET pipe group, software protection control port, hardware protection circuit, optocoupler and power supply at the wiretap control board; Wherein the battery bleeder circuit in the hardware protection circuit is connected with power supply ground with the positive pole of ferric phosphate lithium cell group; Can sample to the voltage of ferric phosphate lithium cell group, the S utmost point of said MOSFET pipe group is connected with the positive pole of ferric phosphate lithium cell group, and the D utmost point of this MOSFET pipe group is connected with described direct current relay path; The G utmost point of this MOSFET pipe group is connected with the 3rd pin of optocoupler; The 2nd pin of optocoupler is connected with hardware protection circuit, and the 1st pin of optocoupler is connected with the software protection control port, and the 4th pin of optocoupler is connected with power supply;
Described N-channel MOS FET pipe group is connected described ferric phosphate lithium cell group between dc bus and described communication base station load; Play the effect of switch in this N-channel MOS FET pipe group; Wherein, Hardware protection circuit connects the 2nd pin of optocoupler, plays the protective effect of the overvoltage/undervoltage of ferric phosphate lithium cell group, is sent to the control signal of software protection control port by higher level's supervisory control system; What the 1st pin of perforation optocoupler played is the protective effect of the overvoltage/undervoltage of each monomer ferric phosphate lithium cell; The situation that overvoltage/undervoltage occurs at ferric phosphate lithium cell group or arbitrary monomer ferric phosphate lithium cell all can make not conducting of optocoupler, thus the G utmost point of N-channel MOS FET pipe group not by high drive, N-channel MOS FET pipe is organized not conducting;
The ferric phosphate lithium cell group can receive the duplicate protection of hardware and software thus, i.e. first order protection is to realize that by software control the second level is to be realized by hardware protection.
But described optocoupler is the optocoupler of the anti-big electric current of a Driven MOSFET pipe; Described N-channel MOS FET pipe group is formed in parallel for the pipe of the N-channel MOS FET more than at least two, can drive many N-channel MOS FET pipes through photoelectric coupled circuit and constitute the heavy DC electronic switch.
Because single Mosfet pipe is limited through current capacity, so adopt many Mosfet pipe parallel operations to constitute electronic DC switch.That utilizes the Mosfet pipe simultaneously forms the free discharge path from body diode; Guarantee that discharge path does not receive the influence of its cut-off current of charge switch; Simultaneously because the Mosfet pipe has the operating characteristic of automatic current equalizing when parallel connection is used; Therefore, parallel connection need not to take the current-sharing measure in using, according to the rated voltage and the specified maximum charge/discharge current of used battery pack, through set ∑ R to N raceway groove Mosfet pipe conducting resistance
DS (ON)=1/NR
DS (ON)Calculate, can draw and select for use N N-channel MOS FET pipe only just can constitute the heavy DC electronic switch.
The function that the utility model is realized is following:
Charging switchgear is safeguarded in the on-line monitoring of the ferric phosphate lithium cell group in a kind of communication base station of the utility model; Through online detection balancing disk to all the monomer ferric phosphate lithium cell real-time onlines in the ferric phosphate lithium cell group balanced the time; Information datas such as the voltage packing of detected each monomer ferric phosphate lithium cell is sent on higher level's supervisory control system; When of the information data real-time analysis of higher level's supervisory control system through this is packed; Judge whether each monomer ferric phosphate lithium cell owes overpressure situation in the ferric phosphate lithium cell group, and the hardware protection circuit in the wiretap control board detects the integral body of ferric phosphate lithium cell group in real time and owes overpressure situation, the situation that overvoltage/undervoltage occurs when ferric phosphate lithium cell group or arbitrary monomer ferric phosphate lithium cell all can make not conducting of optocoupler; And control N-channel MOS FET pipe group opens circuit; Thereby close battery circuit, guaranteed fail safe of ferric phosphate lithium cell group and reliability, thereby improved the on-line maintenance monitoring convenience of ferric phosphate lithium cell group.
Description of drawings
Fig. 1 safeguards the connection simplified schematic diagram of N-channel MOS FET pipe set of pieces when civil power has electricity to charge the battery in the charging switchgear for on-line monitoring in the utility model;
Fig. 2 is the former employing lead-acid battery base station system connection sketch map of power supply in support;
Fig. 3 safeguards charging switchgear for the on-line monitoring of the ferric phosphate lithium cell group in a kind of communication base station of the utility model and connects sketch map;
Fig. 4 connects sketch map at the wiretap control board in the utility model;
Fig. 5 safeguards the connection simplified schematic diagram of N-channel MOS FET pipe set of pieces when civil power power down battery discharge is given the connection load in the charging switchgear for on-line monitoring in the utility model;
Fig. 6 safeguards that for on-line monitoring in the utility model N-channel MOS FET pipe set of pieces is turn-offed the charging sketch map in the charging switchgear when the battery overvoltage;
Embodiment
Explain the utility model in more detail below in conjunction with reference diagram.
See also Fig. 3; Charging switchgear is safeguarded in the on-line monitoring of the ferric phosphate lithium cell group in a kind of communication base station; This device comprises ferric phosphate lithium cell group (401); Communication base station load (403); Said device also comprises online detection balancing disk (100), in wiretap control board (200) and higher level's supervisory control system (300), the both positive and negative polarity of the monomer ferric phosphate lithium cell in the detection interface of said online detection balancing disk (100) and the ferric phosphate lithium cell group (401) is connected, for satisfying communication base station direct current 48V demand; Usually select for use 15 joint monomer ferric phosphate lithium cells to be in series; Online detection balancing disk (100) can carry out voltage detecting to each monomer ferric phosphate lithium cell in the ferric phosphate lithium cell group (401), and generates the detection packet, and the data transfer interface of online detection balancing disk (100) is connected with the data-interface of described higher level's supervisory control system (300); Level supervisory control system (300) reads in above-mentioned detection packet and analyze through data-interface; See also Fig. 4, described electric current input interface at wiretap control board (200) is connected with the positive pole of ferric phosphate lithium cell group (401), is connected with the input of described direct current relay (J) at the electric current output interface of wiretap control board (200); Control end at wiretap control board (200) is connected with the control interface of higher level's supervisory control system (300); The output of direct current relay (J) is connected with described communication base station load (403) through dc bus, between ferric phosphate lithium cell group (401) and communication base station load (403), has played the effect of control connection break-make at wiretap control board (200) through dc bus, when civil power has electricity; Civil power is charged the battery by N-channel MOS FET pipe group (V) conducting on wiretap control board (200) through direct current relay (J) through dc bus again; When the civil power power down, to battery discharge, supply power to communication base station load (403) through dc bus through direct current relay (J) by N-channel MOS FET pipe group (V) conducting on wiretap control board (200).Be lower than 44V when under-voltage up to battery voltage, the parting system D.C. contactor.Ferric phosphate lithium cell group (401) is protected;
Described online detection balancing disk (100); Be used for detecting in real time each monomer ferric phosphate lithium cell state of ferric phosphate lithium cell group (401) and it is carried out reasonable equilibrium; It is to each monomer ferric phosphate lithium cell; Also to each monomer ferric phosphate lithium cell equilibrium result, carry out real-time tracking and the relevant data such as voltage of record in the time of balanced, simultaneously testing result is sent to higher level's supervisory control system (300) through data transfer interface; After higher level's supervisory control system (300) is analyzed according to the described testing result of online detection balancing disk (100), through control interface to send corresponding system switching signal at wiretap control board (200).
The detection interface of described online detection balancing disk more than (100) at least 2 pairs; According to selecting 15 joint monomer ferric phosphate lithium cell special cases usually for use; Employing is greater than 15 pairs detection interface; Each both positive and negative polarity to a monomer ferric phosphate lithium cell in online detection interface and the ferric phosphate lithium cell group (401) is connected; Online detection balancing disk (100) gathers the testing result of each the monomer ferric phosphate lithium cell in the ferric phosphate lithium cell group (401) after data transfer interface is sent to higher level's supervisory control system (300) in real time, and higher level's supervisory control system (300) can in time be found the variable condition of ferric phosphate lithium cell group (401) according to above-mentioned testing result; And state such as voltage of each monomer ferric phosphate lithium cell, temperature, for the battery maintenance system provides first-hand information.
See also Fig. 4; Describedly comprise N-channel MOS FET pipe group (V), software protection control (201) port, hardware protection circuit (203), optocoupler (202) and power supply (204) at wiretap control board (200); Wherein the battery bleeder circuit in the hardware protection circuit (203) is connected with power supply ground with the positive pole of ferric phosphate lithium cell group (401); Can sample to the voltage of ferric phosphate lithium cell group (401); The S utmost point of said MOSFET pipe group (V) is connected with the positive pole of ferric phosphate lithium cell group (401); The D utmost point of this MOSFET pipe group (V) is connected with described direct current relay (J) path, and the G utmost point of this MOSFET pipe group (V) is connected with the 3rd pin of optocoupler (202), and the 2nd pin of optocoupler (202) is connected with hardware protection circuit (203); The 1st pin of optocoupler (202) is connected with software protection control (201) port, and the 4th pin of optocoupler (202) is connected with power supply (204);
Described N-channel MOS FET pipe group (V) is connected described ferric phosphate lithium cell group (401) between dc bus and described communication base station load (403); Play the effect of switch in this N-channel MOS FET pipe group (V); Wherein, Hardware protection circuit (203) connects the 2nd pin of optocoupler (202), plays the protective effect of the overvoltage/undervoltage of ferric phosphate lithium cell group (401), when ferric phosphate lithium cell group (401) voltage surpasses 59V or voltage and is lower than 38V; Hardware protection circuit (203) cuts off the electric current of the 2nd pin that connects optocoupler (202); Thereby optocoupler (202) not conducting N-channel MOS FET pipe group (V) makes electronic switch close, and sends to the control signal that (201) port is controlled in software protection by higher level's supervisory control system (300), and what the 1st pin of perforation optocoupler (202) played is the protective effect of the overvoltage/undervoltage of each monomer ferric phosphate lithium cell; Wherein single-unit ferric phosphate lithium cell overvoltage protection is 3.85V; The under-voltage protection of single-unit ferric phosphate lithium cell software is 2.6V, when higher level's supervisory control system (300) monitors arbitrary monomer ferric phosphate lithium cell when the situation of overvoltage/undervoltage occurring, sends to the control signal of software protection control (201) port; The feasible failure of current that connects the 1st pin of optocoupler (202); Thereby optocoupler (202) not conducting N-channel MOS FET pipe group (V) makes electronic switch close, and the situation that overvoltage/undervoltage occurs at ferric phosphate lithium cell group (401) or arbitrary monomer ferric phosphate lithium cell all can make not conducting of optocoupler (202), thereby the G utmost point of N-channel MOS FET pipe group (V) is not by high drive; Not conducting of N-channel MOS FET pipe group (V), thus played the effect of protection ferric phosphate lithium cell group (401);
The ferric phosphate lithium cell group can receive the duplicate protection of hardware and software thus, i.e. first order protection is to realize that by software control the second level is to be realized by hardware protection.
See also Fig. 1, consider the power supply particularity of communication base station.Just often supply power to dc bus and communication base station load (403) at civil power by civil power; When not having overvoltage like the cell voltage of ferric phosphate lithium cell group (401); Through sending high signal at wiretap control board (200); Opening in the N-channel MOS FET of wiretap control board (200) pipe group (V) to ferric phosphate lithium cell group (401) charging, the arrow among Fig. 1 shows civil power, flows to ferric phosphate lithium cell group (401).
See also Fig. 5; In ferric phosphate lithium cell group (401) when not being full of; Charge switch N-channel MOS FET pipe group (V) is in open mode; Electric current can flow through N-channel MOS FET pipe group (V) inner passage twocouese, and like the civil power power down, continue as communication base station load (403) by ferric phosphate lithium cell group (401) through N-channel MOS FET pipe group (V) this moment provides electric current.Drop to 44V until cell voltage, under-voltage protection action parting system D.C. contactor (J), the arrow among Fig. 5 shows ferric phosphate lithium cell group (401) direct current, flows to communication base station load (403).
When the battery of ferric phosphate lithium cell group (401) is full of electricity; Send low signal N-channel MOS FET pipe group (V) at wiretap control board (200) and turn-off charging; Begin to do the equalization discharge that sour lithium iron battery group (401) is full of, all be full of up to all monomer ferric phosphate lithium cells.Consistent to guarantee every batteries capacity.As the civil power power down takes place during this period, because the base station equipment power supply can not be interrupted, dc bus can require battery that energy is provided immediately.
See also Fig. 6; This moment is because ferric phosphate lithium cell group (401) is in the too high charged state of cell voltage; N-channel MOS FET pipe group (V) also is in off state, and meeting temporarily provides electric current by the internal body diodes of N-channel MOS FET pipe group (V), to guarantee the continuous operation of communication base station.Arrow among Fig. 6 shows ferric phosphate lithium cell group (401) direct current, flows to communication base station load (403) through diode, because diode exists the 0.7V pressure drop power consumption can more greatly can not long-play.
See also among Fig. 6 that diode is N-channel MOS FET pipe group (V) endophyte diode between the D and S, can also pass through N-channel MOS FET pipe group (V) endophyte diode and outwards export because the unidirectional characteristic of diode closes the battery current of having no progeny in N-channel MOS FET pipe group (V).After the civil power power down; Can detect battery discharge very soon at wiretap control board (200); Send high signal makes charge switch N-channel MOS FET pipe group (V) be in open mode at once; Shown in Fig. 5 arrow, ferric phosphate lithium cell group (401) direct current flows to communication base station load (403) through N-channel MOS FET pipe group (V) and continues as this electric.The N-channel MOS FET pipe group (V) of this moment is in conducting state; Electric current N-channel MOS FET pipe group (V) the endophyte diode of no longer flowing through; The power consumption of this moment is the I long time continuous working very, thereby realizes adopting the effect of N-channel MOS FET pipe group (V) as electronic switch.
But described optocoupler is the optocoupler of the anti-big electric current of a Driven MOSFET pipe; This optocoupler is selected for use and is TLP250; It can provide the current flowing of maximum 1.5A; Described N-channel MOS FET pipe group is formed in parallel for the pipe of the N-channel MOS FET more than at least two, and N-channel MOS FET pipe can select IRF4310 as switch element, can drive many IRF4310N channel mosfet pipes through photoelectric coupled circuit and constitute the heavy DC electronic switch.
Because single Mosfet pipe is limited through current capacity, so adopt many Mosfet pipe parallel operations to constitute electronic DC switch.That utilizes the Mosfet pipe simultaneously forms the free discharge path from body diode; Guarantee that discharge path does not receive the influence of its cut-off current of charge switch; Because the Mosfet pipe has the operating characteristic of automatic current equalizing when parallel connection is used, therefore in parallel connection is used, need not to take the current-sharing measure simultaneously, the rated voltage of the used battery pack of communication base station is 48V; Specified maximum charge and discharge electric current is 200A, through the set ∑ R to IRF4310N raceway groove Mosfet pipe conducting resistance
DS (ON)=1/NR
DS (ON)And each calculation of parameter, can draw and select for use 20 IRF4310N channel mosfet pipes just can constitute the heavy DC electronic switch of the used battery pack of communication base station.
More than be merely the preferred embodiment of the utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various changes, variation and omission.For example; Adopt the form of P raceway groove Mosfet pipe parallel connection also to can be the purpose that realizes that the utility model is set forth; All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (4)
1. charging switchgear is safeguarded in the on-line monitoring of the ferric phosphate lithium cell group in the communication base station; This device comprises ferric phosphate lithium cell group (401); Communication base station load (403); Direct current relay (J); It is characterized in that: said device also comprises online detection balancing disk (100), in wiretap control board (200) and higher level's supervisory control system (300); The both positive and negative polarity of the monomer ferric phosphate lithium cell in the detection interface of said online detection balancing disk (100) and the ferric phosphate lithium cell group (401) is connected; The data transfer interface of online detection balancing disk (100) is connected with the data-interface of described higher level's supervisory control system (300), and described electric current input interface at wiretap control board (200) is connected with the positive pole of ferric phosphate lithium cell group (401), is connected with the input of described direct current relay (J) at the electric current output interface of wiretap control board (200); The output of direct current relay (J) is connected with described communication base station load (403) through dc bus, is connected with the control interface of higher level's supervisory control system (300) at the control end of wiretap control board (200);
Described online detection balancing disk (100); Be used for detecting in real time each cell state of ferric phosphate lithium cell group (401) and it is carried out reasonable equilibrium; Simultaneously testing result is sent to higher level's supervisory control system (300) through data transfer interface, higher level's supervisory control system (300) is passed through control interface to sending corresponding system switching signal at wiretap control board (200) according to the described testing result of online detection balancing disk (100).
2. charging switchgear is safeguarded in the on-line monitoring of the ferric phosphate lithium cell group in a kind of communication base station according to claim 1; It is characterized in that: described online detection balancing disk (100) comprises the detection interface more than at least 2 pairs; Each both positive and negative polarity to a monomer ferric phosphate lithium cell in online detection interface and the ferric phosphate lithium cell group (401) is connected, and online detection balancing disk (100) gathers the testing result of each the monomer ferric phosphate lithium cell in the ferric phosphate lithium cell group (401) after data transfer interface is sent to higher level's supervisory control system (300) in real time.
3. charging switchgear is safeguarded in the on-line monitoring of the ferric phosphate lithium cell group in a kind of communication base station according to claim 1; It is characterized in that: describedly comprise N-channel MOS FET pipe group (V), software protection control (201) port, hardware protection circuit (203), optocoupler (202) and power supply (204) at wiretap control board (200); Wherein the battery bleeder circuit in the hardware protection circuit (203) is connected with power supply ground with the positive pole of ferric phosphate lithium cell group (401); The S utmost point of said MOSFET pipe group (V) is connected with the positive pole of ferric phosphate lithium cell group (401); The D utmost point of this MOSFET pipe group (V) is connected with described direct current relay (J) path; The G utmost point of this MOSFET pipe group (V) is connected with the 3rd pin of optocoupler (202); The 2nd pin of optocoupler (202) is connected with hardware protection circuit (203), and the 1st pin of optocoupler (202) is connected with software protection control (201) port, and the 4th pin of optocoupler (202) is connected with power supply (204);
Described N-channel MOS FET pipe group (V) is connected described ferric phosphate lithium cell group (401) between dc bus and described communication base station load (403).
4. safeguard charging switchgear according to the on-line monitoring of the ferric phosphate lithium cell group in the said a kind of communication base station of claim 3; It is characterized in that: described optocoupler (202) but be the optocoupler of the anti-big electric current of a Driven MOSFET pipe, described N-channel MOS FET pipe group (V) is formed in parallel for N-channel MOS FET more than at least two pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011202822638U CN202260412U (en) | 2011-08-05 | 2011-08-05 | Online monitoring and maintaining charging switch gear of lithium iron phosphate battery pack in communication base station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011202822638U CN202260412U (en) | 2011-08-05 | 2011-08-05 | Online monitoring and maintaining charging switch gear of lithium iron phosphate battery pack in communication base station |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852358A (en) * | 2014-08-21 | 2015-08-19 | 北汽福田汽车股份有限公司 | High-voltage battery over-voltage and under-voltage protection system and automobile provided with same |
| CN107894567A (en) * | 2016-10-03 | 2018-04-10 | 凹凸电子（武汉）有限公司 | The detecting system and detection method of battery bag and battery bag Interface status |
| CN109103960A (en) * | 2016-09-22 | 2018-12-28 | 深圳市大疆创新科技有限公司 | Control method, control system, storage medium and the unmanned vehicle of battery pack |
-
2011
- 2011-08-05 CN CN2011202822638U patent/CN202260412U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852358A (en) * | 2014-08-21 | 2015-08-19 | 北汽福田汽车股份有限公司 | High-voltage battery over-voltage and under-voltage protection system and automobile provided with same |
| CN109103960A (en) * | 2016-09-22 | 2018-12-28 | 深圳市大疆创新科技有限公司 | Control method, control system, storage medium and the unmanned vehicle of battery pack |
| CN107894567A (en) * | 2016-10-03 | 2018-04-10 | 凹凸电子（武汉）有限公司 | The detecting system and detection method of battery bag and battery bag Interface status |
| US10574068B2 (en) | 2016-10-03 | 2020-02-25 | O2Micro Inc. | Charge/discharge switch control circuits for batteries |
| US11050279B2 (en) | 2016-10-03 | 2021-06-29 | O2Micro, Inc. | Charge/discharge switch control circuits for batteries |
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