CN103997103B - Behindhand battery voltage balancing device - Google Patents
Behindhand battery voltage balancing device Download PDFInfo
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- CN103997103B CN103997103B CN201410263144.6A CN201410263144A CN103997103B CN 103997103 B CN103997103 B CN 103997103B CN 201410263144 A CN201410263144 A CN 201410263144A CN 103997103 B CN103997103 B CN 103997103B
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- 238000001914 filtration Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 2
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- 230000002459 sustained effect Effects 0.000 claims description 2
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Abstract
The present invention relates to power electronic equipment technical field, be specially a kind of behindhand battery voltage balancing device.Solve with high costs when needing to change after the situation that voltage falls behind appears in current some batteries of storage batteries of transformer substation group and there is the technical problem of potential safety hazard.A kind of behindhand battery voltage balancing device, comprising the battery voltage acquisition module for gathering behindhand battery both end voltage, gathering the charging current acquisition module of behindhand battery charging current, to the pulse-width modulation charging module of behindhand battery charging and the built-in isolated form stabilized voltage power supply to above-mentioned three module for power supply; The signal output part of described battery voltage acquisition module and charging current acquisition module has a control module by an analog to digital converter model calling jointly; The module modulated output signal output of described control module is connected with the signal input part of pulse-width modulation charging module.Present invention saves the fund of extensive capital equipment, significantly reduce workload, be more conducive to energy-saving and emission-reduction.
Description
Technical field
The present invention relates to power electronic equipment technical field, be specially a kind of behindhand battery voltage balancing device.
Background technology
Batteries is the critical elements of transformer station, and its effect is that the important load when electric power system is broken down to transformer station provides power supply.The 2 volt large-capacity batteries of batteries usually by about 110 that important transformer station uses are in series, reason percentage of batteries due to manufacture view can show voltage and fall behind phenomenon, if any cell voltage comparatively standard electric force down 100 millivolts or more, far above the requirement that Guo Wang company voltage difference is less than 30 millivolts.Because the voltage of behindhand battery is for a long time lower than normal voltage, make the pole plate of voltage lagging batteries there is certain sulphation, cause internal resistance of cell increase, charge-discharge performance, battery capacity and reliability decrease.The usual practice that production scene addresses this problem is whole group and changes storage battery.According to battery quotation several years ago, the price of one group of import 500 ampere-hour valve-control storage battery about 180,000 yuans, the price of one group of import 300 ampere-hour valve-control storage battery about 120,000 yuans, the price of one group of domestic 300 ampere-hour valve-control storage battery about 90,000 yuans, can find out that the whole group of scheme changing storage battery is by the fund of at substantial, add the workload that new battery is installed, and first meeting out of service for primary cell group to be caused unsafe factor when changing battery pack, and may environmental pollution be caused when the battery changed is disassembled, produce Environmental security hidden danger.
Summary of the invention
The present invention is with high costs when needing replacing after the situation that voltage falls behind appears in current some batteries of storage batteries of transformer substation group of solution and there is the technical problem of potential safety hazard, provides a kind of behindhand battery voltage balancing device.
The present invention adopts following technical scheme to realize: a kind of behindhand battery voltage balancing device, comprising the battery voltage acquisition module for gathering behindhand battery both end voltage, gathering the charging current acquisition module of behindhand battery charging current, to the pulse-width modulation charging module of behindhand battery charging and the built-in isolated form stabilized voltage power supply to above-mentioned three module for power supply; The signal output part of described battery voltage acquisition module and charging current acquisition module has a control module by an analog to digital converter model calling jointly; The signal output part of described control module is connected with the signal input part of pulse-width modulation charging module; Be serially connected with a fixed value resistance R1 in the charge circuit of described pulse-width modulation charging module, the signal input part of described charging current acquisition module is connected to the two ends of fixed value resistance R1.
During embody rule, the built-in isolated form stabilized voltage power supply of this device is connected with external AC-DC power supply adaptor, to power to battery voltage acquisition module, charging current acquisition module, pulse-width modulation charging module and control module.The present invention gathers the voltage at battery two ends and the charging current of battery respectively by battery voltage acquisition module and charging current acquisition module, control module compares the voltage of the battery collected and setting, when the magnitude of voltage collected is lower than standard value, control module sends signal to pulse-width modulation charging module, and pulse-width modulation charging module is charged to behindhand battery by charge circuit; Control module controls charging current and cell voltage by the adjusting pulsewidth index of modulation.Analog to digital converter module inputs in control module after converting the analog signal of the electric current collected and voltage to digital signal, compares for control module and the standard value preset.Those skilled in the art can write out corresponding software easily after reading present specification; Described pulse-width modulation charging module is existing known technology, is (see based on the design of the solar recharging system of pulse width modulating technology, Chongqing University of Science and Technology journal, the 11st volume the 2nd phase in 2009) that those skilled in the art easily realize.
Further, the battery temperature acquisition module of being powered by built-in isolated form stabilized voltage power supply for gathering behindhand battery temperature is also comprised; The described signal end of battery temperature acquisition module is connected with the signal end of control module.
The charging current of analog to digital converter module to the terminal voltage of battery and battery pack of this device carries out acquisition time, needs to adopt signal switching circuit to switch signal, and device have employed analog switch CD4052; An excellent battery management system needs to monitor the temperature of battery and should adjust its floating charge terminal voltage to ensure carrying capacity and the life-span of battery according to its temperature, cell voltage temperature-compensating selector switch is provided with in device, according to the cell voltage temperature compensation coefficient setting that cell production companies provides, the floating charge temperature coefficient of 5 batteries is stored in this device, be 0mV/ DEG C (uncompensation) ,-2mV/ DEG C ,-3mV/ DEG C ,-3.5mV/ DEG C ,-4.0mV/ DEG C respectively, the data provided according to cell production companies during application arrange DIP switch state.
Further, the signal output part of described control module is also connected with a display module.
Display module is for showing operating state and the running parameter of whole device; Be convenient to carry out parameter adjustment and monitor in real time.
1, the battery two ends fallen behind Individual cells voltage in a group storage battery also connect described device and carry out boost charge and do not need to change whole Battery pack, ensure that the normal work of degradation phenomena and batteries does not occur this battery pole plates.
If 2 change one group of domestic 300Ah sealed valve control lead-acid storage, calculate and about need 90,000 yuans, technical scheme described in the innovation has saved the fund of extensive capital equipment.
If 3 adopt the whole group of method changing storage battery, the workload that will cost a lot of money, the battery changed has a negative impact to environment again, adopts technical scheme described in the innovation then to significantly reduce workload, is more conducive to energy-saving and emission-reduction.
4, described installation cost cost is lower, and it is convenient to install, and has saved production cost.
5, described device adds check diode in the charge circuit, and assurance device only charges to voltage behindhand battery, do not discharge.
Accompanying drawing explanation
Fig. 1 structural representation of the present invention.
Fig. 2 structure diagram of the present invention.
Fig. 3 internal circuit connection layout of the present invention.
1-AC/DC adapter, the built-in isolated form stabilized voltage power supply of 2-, 3-battery temperature acquisition module, 4-battery voltage acquisition module, 5-charging current acquisition module, 6-pulse-width modulation charging module, 7-analog to digital converter module, 8-control module, 9-display module, 10-behindhand battery, 11-behindhand battery voltage balancing device.
Embodiment
A kind of behindhand battery voltage balancing device, comprising the battery voltage acquisition module 4 for gathering behindhand battery 10 both end voltage, gathering the charging current acquisition module 5 of behindhand battery 10 charging current, to the pulse-width modulation charging module 6 of behindhand battery 10 charging and the built-in isolated form stabilized voltage power supply 2 to above-mentioned three module for power supply; The signal output part of described battery voltage acquisition module 4 and charging current acquisition module 5 is connected with a control module 8 by an analog to digital converter module 7 jointly; The signal output part of described control module 8 is connected with the signal input part of pulse-width modulation charging module 6; Be serially connected with a fixed value resistance R1 in the charge circuit of described pulse-width modulation charging module 6, the signal input part of described charging current acquisition module 5 is connected to the two ends of fixed value resistance R.
Also comprise the battery temperature acquisition module 3 of being powered by built-in isolated form stabilized voltage power supply 2 for gathering behindhand battery 10 temperature; The signal end of described battery temperature acquisition module 3 is connected with the signal end of control module 8.
The signal output part of described control module 8 is also connected with a display module 9.
Described pulse-width modulation charging module 6 comprises the driver element of TC4469, P type power field effect pipe T1, energy storage inductor L1, sustained diode 1, check diode D2, filtering capacitor E2 and positive temperature coefficient self-recoverage resistance PTC; The driver element output of described TC4469 is connected to resistance R3 and R2; The other end of R2 is connected with the grid of T1, and the drain electrode of T1 is connected with L1, and the other end of L1 is connected with D2 positive pole, and D2 negative pole is connected with PTC, and the other end of PTC is connected with terminals J1; The drain electrode of T1 is also connected with D1 negative pole, the plus earth of D1; The source electrode of T1 is connected with the other end of resistance R2 and is connected with built-in isolated form stabilized voltage power supply 2; Divider resistance R4 and R5 is serially connected with between second, third terminals of terminals J1; The two ends of described R5 are connected with battery voltage acquisition module 4; 4th terminals of J1 are by fixed value resistance R1 ground connection, and the two ends of R1 are connected with charging current acquisition module 5; The signal output part of described control module 8 is connected with a signal input part PWM of driver element.The positive pole of capacitor E2 is as charging output.Another signal input part ground connection of driver element.As shown in Figure 3, in dotted line frame be the driver element of TC4469.
The collection of charging current to behindhand battery and terminal voltage can be realized by foregoing circuit, and the charging work to behindhand battery can be realized.
Device of the present invention is by control module, interior power supply circuit, display circuit (circuit of display module), microcontrollers monitor reset circuit, analog to digital conversion circuit, voltage reference circuit, negative voltage circuit for generating, cell voltage bleeder circuit (above-mentioned three circuit and analog to digital converter module match), charge current sample circuit, analog switching circuit, digital temperature sensor, the formations such as pulse-width modulation battery charger and cell voltage temperature compensation coefficient selector switch.The 51 serial 8 8-digit microcontroller SM5964 having pulse-width modulation and export selected by microcontroller, this microcontroller has the RAM of the FLASH memory of 64K byte, control circuit for pulse-width modulation, 1K byte, also has a WatchDog Timer, can ensure that microcontroller, under comparatively strong electromagnetic interference environment, the event that crashes for a long time does not occur, be a kind of microcontroller being applicable to this project.External power adapter adopts AC100-240V input, DC24V exports, the industrial power of output current 2 amperes, interior power supply circuit adopt the high reliability insulating power supply module that input voltage is 19-36V, output voltage is 5V, the isolation voltage of input and output side is 1500VDC, display circuit have employed the 16*2 character point formation LCD MODULE of band LED-backlit, for operating state and the running parameter of display unit; Microcontrollers monitor reset circuit provides power-on reset signal for microcontroller, and this device adopts MAX810 as monitoring and reset circuit; Because transformer station exists larger electromagnetic interference, the analog to digital converter of this device adopts good in anti-interference performance, dual integ ration ADC ICL7135 low in energy consumption; Voltage reference adopts that REF192E produces through high accuracy, high stability and high reliability electric resistance partial pressure again, negative-voltage generator provides-5 volt voltages for ICL7135, and the negative-voltage generator of this device have employed MAX1044; Digital temperature sensor have employed DS18B20, battery voltage signal is obtained by high accuracy, high stability and high reliability electric resistance partial pressure equally, charging current signal is obtained by the voltage drop produced during small resistor by charging current, and the pulse-width signal that pulse-width modulation battery charger is produced by microcontroller, field effect transistor drive circuit, P type power field effect pipe, energy storage inductor, fly-wheel diode, filtering capacitor and check diode etc. are formed.
If Fig. 1, AC-DC power supply adaptor is external power source, the industrial power that employing AC100-240V input, DC24V, 2A export supplies this device and uses (this power supply can be 5 behindhand battery voltage balancing devices of the same type in same group storage battery and powers); Built-in isolated form stabilized voltage power supply adopts the high reliability insulating power supply module that input voltage is 19-36V, output voltage is 5V, the isolation voltage of input and output side is 1500VDC, for battery temperature acquisition module, battery voltage acquisition module, charging current acquisition module, pulse-width modulation charging module provide power supply.
Control module is passed through after the temperature collected, voltage, electric current, carry out control with pulse-width modulation charging module to behindhand battery to charge, wherein microcontrollers monitor reset circuit is that microcontroller (main control module) provides power-on reset signal, and the present invention adopts MAX810 as monitoring and reset circuit; The pulse-width signal that pulse-width modulation battery charger is produced by microcontroller, field effect transistor drive circuit, P type power field effect pipe, energy storage inductor, fly-wheel diode, filtering capacitor and check diode etc. are formed.Display module have employed the 16*2 character point formation liquid crystal display of band LED-backlit, for the operating state that shows and operational factor.
Cell voltage temperature-compensating selector switch in this device, 0mV/ DEG C (uncompensation) respectively,-2mV/ DEG C,-3mV/ DEG C,-3.5mV/ DEG C,-4.0mV/ DEG C, according to the cell voltage temperature compensation coefficient setting that cell production companies provides, Vset=2.250V+ cell voltage temperature compensation coefficient * (25-T), T is battery temperature, 2.250V is the float charge voltage value of battery 25 DEG C time that battery producer provides, cell voltage temperature compensation coefficient is provided by battery producer, immediate penalty coefficient is selected: 0 by selector switch,-2.0/ DEG C,-3.0/ DEG C,-3.5/ DEG C,-4.0/ DEG C, also can write direct when control program is worked out temperature compensation coefficient.
For the pressure drop avoiding electric current to be produced by wire causes voltage measurement error, device have employed four-line measurement method, and 1 end of J1 is connected with the positive pole of behindhand battery with 2 ends, and 3 ends are connected with the negative pole of behindhand battery with 4 ends.Charging current to anode through 1 end of D2, PTC, J1, is flowed out by battery cathode again, gets back to power cathode through R1.Big current is not had, so 2,3 end wires do not have pressure drop substantially in 2, the 3 end wires of J1.
R1 gets 50 milliohms, and R4, R5 all get 20 kilo-ohms.
This device only needs at voltage behindhand battery two ends and connects battery voltage device, has not only saved the great number cost changing batteries in groups, has alleviated the workload of staff's service equipment, and reduce engineering risk.
Claims (4)
1. a behindhand battery voltage balancing device, is characterized in that: comprising the battery voltage acquisition module (4) for gathering behindhand battery (10) both end voltage, gathering the charging current acquisition module (5) of behindhand battery (10) charging current, the pulse-width modulation charging module (6) charged to behindhand battery (10) and the built-in isolated form stabilized voltage power supply (2) to above-mentioned three module for power supply; The signal output part of described battery voltage acquisition module (4) and charging current acquisition module (5) is connected with a control module (8) by an analog to digital converter module (7) jointly; The signal output part of described control module (8) is connected with the signal input part of pulse-width modulation charging module (6); Be serially connected with a fixed value resistance R1 in the charge circuit of described pulse-width modulation charging module (6), the signal input part of described charging current acquisition module (5) is connected to the two ends of fixed value resistance R1; Also comprise the battery temperature acquisition module (3) of being powered by built-in isolated form stabilized voltage power supply (2) for gathering behindhand battery (10) temperature; The signal output part of described battery temperature acquisition module (3) is connected with the signal input part of control module (8); The signal output part of described control module (8) is also connected with a display module (9); Described pulse-width modulation charging module (6) comprises the driver element of TC4469, P type power field effect pipe T1, energy storage inductor L1, sustained diode 1, check diode D2, filtering capacitor E2 and positive temperature coefficient self-recoverage resistance PTC; The driver element output of described TC4469 is connected to resistance R3 and R2; The other end of R2 is connected with the grid of T1, and the drain electrode of T1 is connected with L1, and the other end of L1 is connected with D2 positive pole, and D2 negative pole is connected with PTC, and the other end of PTC is connected with terminals J1; The drain electrode of T1 is also connected with D1 negative pole, the plus earth of D1; The source electrode of T1 is connected with the other end of resistance R3 and is connected with built-in isolated form stabilized voltage power supply (2); Divider resistance R4 and R5 is serially connected with between second, third terminals of terminals J1; The two ends of described R5 are connected with battery voltage acquisition module (4); 4th terminals of J1 are by fixed value resistance R1 ground connection, and the two ends of R1 are connected with charging current acquisition module (5); The signal output part of described control module (8) is connected with a signal input part of driver element.
2. behindhand battery voltage balancing device according to claim 1, it is characterized in that: built-in isolated form stabilized voltage power supply (2) adopts the high reliability insulating power supply module that input voltage is 19-36V, output voltage is 5V, and the isolation voltage of input and output side is 1500VDC; Control module (8) adopts 51 serial 8 8-digit microcontroller SM5964.
3. behindhand battery voltage balancing device according to claim 1, is characterized in that: display module (9) have employed the 16*2 character point formation LCD MODULE of band LED-backlit; Battery temperature acquisition module (3) adopts DS18B20 type digital temperature sensor; Analog to digital converter module (7) adopts dual integ ration ADC ICL7135.
4. behindhand battery voltage balancing device according to claim 1, is characterized in that: there are the RAM of the FLASH memory of 64K byte, 1K byte, control circuit for pulse-width modulation have a WatchDog Timer in control module (8) inside.
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| CN105304018A (en) * | 2015-11-13 | 2016-02-03 | 苏州扬佛自动化设备有限公司 | Interaction display screen control circuit |
| CN108306349A (en) * | 2017-01-13 | 2018-07-20 | 宁德时代新能源科技股份有限公司 | Battery equalization sampling method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201616696U (en) * | 2009-11-30 | 2010-10-27 | 奇瑞汽车股份有限公司 | Wireless charging circuit of lithium battery of electric vehicle |
| CN202721476U (en) * | 2012-08-20 | 2013-02-06 | 成都讯易达通信设备有限公司 | Controller used for miniature wind turbine generator |
| CN203967786U (en) * | 2014-06-14 | 2014-11-26 | 国家电网公司 | Behindhand battery voltage balancing device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5982142A (en) * | 1998-05-22 | 1999-11-09 | Vanner, Inc. | Storage battery equalizer with improved, constant current output filter, overload protection, temperature compensation and error signal feedback |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201616696U (en) * | 2009-11-30 | 2010-10-27 | 奇瑞汽车股份有限公司 | Wireless charging circuit of lithium battery of electric vehicle |
| CN202721476U (en) * | 2012-08-20 | 2013-02-06 | 成都讯易达通信设备有限公司 | Controller used for miniature wind turbine generator |
| CN203967786U (en) * | 2014-06-14 | 2014-11-26 | 国家电网公司 | Behindhand battery voltage balancing device |
Non-Patent Citations (1)
| Title |
|---|
| 便携式仪表电池管理***研究;曹志鹏;《中国优秀硕士学位论文全文数据库》;20111231;正文16页至65页 * |
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