CN103066667B - Based on battery balancing system and the method for separated transformer - Google Patents
Based on battery balancing system and the method for separated transformer Download PDFInfo
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- CN103066667B CN103066667B CN201310029689.6A CN201310029689A CN103066667B CN 103066667 B CN103066667 B CN 103066667B CN 201310029689 A CN201310029689 A CN 201310029689A CN 103066667 B CN103066667 B CN 103066667B
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Abstract
The invention discloses a kind of battery balancing system based on separated transformer and method, described system comprises: single-chip microcomputer, series battery and balancing unit, and monocell is connected with single-chip microcomputer by balancing unit; Each monocell is a corresponding balancing unit respectively, and balancing unit is connected in positive and negative the two poles of the earth of corresponding monocell in parallel; Also comprise voltage collection circuit and drive circuit, balancing unit is connected with the voltage acquisition input interface of single-chip microcomputer, drive singal output interface respectively by voltage collection circuit, drive circuit; Balancing unit comprises driving transformer T1, flyback power transformer T2 and device for power switching.The present invention can simplify circuit structure, reduces energy ezpenditure, saves cost.
Description
Technical field
The present invention relates to a kind of battery balancing system based on separated transformer and method, belong to battery equilibrium technical field.
Background technology
At present, battery equilibrium technology mainly contains following several modes:
1, passive equilibrium pattern, as shown in Figure 5, it belongs to the most easy implementation, is only to consume discharge mode, is only applicable to full electric equilibrium, can not solves the problem that discharge capacity makes full use of.
2, inductance delivery mode, as shown in Figure 6, the electricity of a battery is made to be delivered in adjacent battery by inductance, the bidirectional balanced of battery can be realized, but it is only more effective to the transmission between adjacent cell, battery apart from each other is difficult to transferring energy effectively, and the battery not therefore being suitable for a greater number connects.
3, flying capacitance pattern, by electric capacity transferring energy, utilizes electronics or mechanical switch to be connected on different batteries by an electric capacity timesharing, and what work to energy transferring is only voltage difference between battery, and therefore the transmission efficiency of this pattern is on the low side.
4, transformer transfer mode, as shown in Figure 7, the two-way mode by transformer carries out energy transferring, can carry out the collection of voltage simultaneously; Existing structure needs the transformer of a Multiple coil, needs the winding of cell number+1, and each winding needs 2 leading-out terminals, and after number of batteries is increased to some, the processing technology of this transformer will very complicated, difficult, Expenses Cost.
Summary of the invention
The object of the invention is to, a kind of battery balancing system based on separated transformer and method are provided, can circuit structure be simplified, reduce energy ezpenditure, save cost.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of battery balancing system based on separated transformer, and comprise single-chip microcomputer, series battery and balancing unit, monocell is connected with single-chip microcomputer by balancing unit; Each monocell is a corresponding balancing unit respectively, and balancing unit is connected in positive and negative the two poles of the earth of corresponding monocell in parallel; Also comprise voltage collection circuit and drive circuit, balancing unit is connected with the voltage acquisition input interface of single-chip microcomputer, drive singal output interface respectively by voltage collection circuit, drive circuit; Balancing unit comprises driving transformer T1, flyback power transformer T2 and device for power switching.
Aforesaid based in the battery balancing system of separated transformer, the input of driving transformer T1 is connected to drive singal output interface and battery electrode respectively, and the output of driving transformer T1 is connected to device for power switching and monocell negative pole respectively; The positive input terminal of flyback power transformer T2 is connected to monocell positive pole, the negative input end of flyback power transformer T2 is connected with device for power switching, and the positive output end of flyback power transformer T2 is connected to voltage collection circuit and battery anode respectively by diode timesharing isolation.
Aforesaid based in the battery balancing system of separated transformer, balancing unit also comprises the protection and absorb circuit of the input being connected in flyback power transformer T2 in parallel.
Aforesaid based in the battery balancing system of separated transformer, be provided with between the positive input terminal of driving transformer T1 and drive circuit and drive shaping circuit A, be provided with between the positive output end of driving transformer T1 and device for power switching and drive shaping circuit B.All driving shaping circuit can be increased as required between the positive input terminal of driving transformer T1 and drive circuit, between the positive output end of driving transformer T1 and device for power switching.
Aforesaid based in the battery balancing system of separated transformer, device for power switching adopts N slot field-effect transistor Q1 or bipolarity triode.
Aforesaid based in the battery balancing system of separated transformer, the N slot field-effect transistor Q1 that device for power switching preferably adopts cost performance higher, writes a Chinese character in simplified form NMOSFET.
Aforesaid based in the battery balancing system of separated transformer, single-chip microcomputer comprises controller, and controller is provided with:
Voltage sequencing unit, for sorting to the cell voltage gathered;
Battery capacity converting unit, for being converted into battery capacity by cell voltage;
Pulse computing unit, for calculating the umber of pulse needed for balance corresponding to battery capacity;
Wherein, voltage sequencing unit, battery capacity converting unit are connected in turn with pulse computing unit, and pulse computing unit is connected with drive singal output interface.
Realize the battery balancing method based on separated transformer of aforementioned system, comprise the following steps:
S1, singlechip controller drives the balancing unit of each monocell successively by driving transformer T1, postpone after device for power switching is opened certain hour carry out after the collection of terminal voltage record; Because now flyback power transformer T2 works in the normal shock stage, output voltage is similar to direct ratio cell voltage, thus gets the voltage of each battery, realizes the collection of cell voltage; Back driving circuit close field device for power switching, the energy flyback mode stored in flyback power transformer T2 is transported to battery pack bus.
S2, singlechip controller is according to the difference of the cell voltage gathered, and within the time period, give the drive signal impulse number that each battery is different, the unit that number of drive pulses is many will shift more energy to bus, thus reach the balance of battery.
Aforesaid based in the battery balancing method of separated transformer, described step S2 specifically comprises:
S21, voltage sequencing unit sorts to the cell voltage gathered;
S22, cell voltage is converted into battery capacity by battery capacity converting unit;
S23, pulse computing unit calculates the umber of pulse needed for balance corresponding to battery capacity;
S24, drive singal output interface sends drive singal according to the balance required pulse number calculated.
Compared with prior art, the present invention has the following advantages:
1, make each battery of internal battery pack use independently transformer separately, balanced balanced current only flows to battery pack from battery, significantly simplifies circuit structure.
2, device for power switching is independent, because in battery side without the need to control logic, does not also have mutual connection completely between the different circuit units of battery side simultaneously, so that set up the balancing circuitry of any electric current scale.
3, drive part uses transformer to drive, the driving of battery side device for power switching uses Magnetic isolation, can ensure like this when after system stalls, namely time singlechip controller does not have a demand for control, system is in the consumption level of the leakage current only only having device for power switching and electric capacity, and this consumption is lower than ua grade.
4, voltage collection circuit and power transfer circuit are merged, voltage sample link is in the secondary end of flyback power transformer T2, the induced voltage being through the normal shock period after transformer detected, flyback power transformer T2 completes the isolation of sampled voltage simultaneously, sampled and special high-pressure battery sampling chip by divider resistance differential voltage compared to common, circuit is simpler, and cost is also lower.
Accompanying drawing explanation
Fig. 1 is the structural representation of battery equilibrium unit in a kind of embodiment of the present invention;
Fig. 2 is the structural representation of the battery balancing system of a kind of embodiment of the present invention;
Fig. 3 is the pulse diagram in the voltage acquisition stage of a kind of embodiment of the present invention;
Fig. 4 is the pulse diagram in the battery balanced stage of a kind of embodiment of the present invention;
Fig. 5 is the circuit diagram of passive equilibrium pattern;
Fig. 6 is the circuit diagram of inductance delivery mode;
Fig. 7 is the circuit diagram of transformer transfer mode;
Fig. 8 is the schematic diagram of voltage collection circuit in a kind of embodiment of the present invention.
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated.
Embodiment
Embodiments of the invention: a kind of battery balancing system based on separated transformer, as shown in Figure 2, comprise single-chip microcomputer, series battery (BATT01, BATT02 ... BATT-N) and balancing unit, monocell is connected with single-chip microcomputer by balancing unit; Each monocell is a corresponding balancing unit respectively, and balancing unit is connected in positive and negative the two poles of the earth of corresponding monocell in parallel; Also comprise voltage collection circuit and drive circuit, balancing unit is connected with the voltage acquisition input interface of single-chip microcomputer, drive singal output interface respectively by voltage collection circuit, drive circuit.Voltage collection circuit as shown in Figure 8.
As shown in Figure 1, balancing unit comprises driving transformer T1, flyback power transformer T2 and device for power switching; The input of driving transformer T1 is connected to drive singal output interface and battery electrode respectively, and the output of driving transformer T1 is connected to device for power switching and monocell negative pole respectively; The positive input terminal of flyback power transformer T2 is connected to monocell positive pole, the negative input end of flyback power transformer T2 is connected with device for power switching, and the positive output end of flyback power transformer T2 is connected to voltage collection circuit and battery anode respectively by diode timesharing isolation; Balancing unit also comprises the protection and absorb circuit of the input being connected in flyback power transformer T2 in parallel; Be provided with between the positive input terminal of driving transformer T1 and drive circuit and drive shaping circuit A, be provided with between the positive output end of driving transformer T1 and device for power switching and drive shaping circuit B; Device for power switching adopts N slot field-effect transistor Q1.
Single-chip microcomputer comprises controller, and controller is provided with: voltage sequencing unit, for sorting to the cell voltage gathered; Battery capacity converting unit, for being converted into battery capacity by cell voltage; Pulse computing unit, for calculating the umber of pulse needed for balance corresponding to battery capacity.Wherein, voltage sequencing unit, battery capacity converting unit are connected in turn with pulse computing unit, and pulse computing unit is connected with drive singal output interface.
Based on a battery balancing method for separated transformer, comprise the following steps:
S1, as shown in Figure 3, singlechip controller drives the balancing unit of each monocell successively by driving transformer T1, postpone after device for power switching is opened certain hour carry out after the collection of terminal voltage record; Because now flyback power transformer T2 works in the normal shock stage, output voltage is similar to direct ratio cell voltage, thus gets the voltage of each battery; Back driving circuit close field-effect transistor Q1, the energy flyback mode stored inside power transformer is transported to battery pack bus.
S2, singlechip controller is according to the difference of the cell voltage gathered, and within the time period, give the drive signal impulse number that each battery is different, the unit that number of drive pulses is many will shift more energy to bus, thus reach the balance of battery.As shown in Figure 4, the 3rd tunnel is the driving of the battery unit that voltage is minimum, and this element does not participate in electric discharge balance; Second tunnel, the first via, N road are that cell voltage arranges from high to low, and corresponding electric discharge duration also arranges from high to low, therefore finally reaches the balance of battery electric quantity.
Described step S2 specifically comprises:
S21, voltage sequencing unit sorts to the cell voltage gathered;
S22, cell voltage is converted into battery capacity by battery capacity converting unit;
S23, pulse computing unit calculates the umber of pulse needed for balance corresponding to battery capacity;
S24, drive singal output interface sends drive singal according to the balance required pulse number calculated.
Operation principle: when drive circuit sends drive singal, field-effect transistor Q1 turn-on battery is to the elementary charging of flyback power transformer T2, now flyback power transformer T2 level will induce a signal (i.e. positive energizing mode) be directly proportional with single battery voltage, this signal is transferred to voltage collection circuit by diode D2, and control battery successively conducting just can obtain the voltage of each battery; Voltage sequencing unit on singlechip controller sorts to the cell voltage gathered, cell voltage is converted into battery capacity by battery capacity converting unit, pulse computing unit calculates the umber of pulse needed for balance corresponding to battery capacity, and drive singal output interface sends drive singal according to the balance required pulse number calculated; When scene effect transistor Q1 closes, flyback power transformer T2 is by the needs of a generation afterflow, now elementary because ended by field-effect transistor Q1, the energy that flyback power transformer T2 stores will, by diode D1, carry out discharging (i.e. flyback mode) to battery pack; By controlling the driving pulse quantity of each balancing unit, different monocells can be allowed to shift different electricity to battery pack, thus utilize the work of voltage sample and energy trasfer of same set of balancing unit circuit realiration.
Claims (6)
1. based on a battery balancing system for separated transformer, it is characterized in that: comprise single-chip microcomputer, series battery and balancing unit, monocell is connected with single-chip microcomputer by balancing unit; Each monocell is a corresponding balancing unit respectively, and balancing unit is connected in positive and negative the two poles of the earth of corresponding monocell in parallel; Also comprise voltage collection circuit and drive circuit, balancing unit is connected with the voltage acquisition input interface of single-chip microcomputer, drive singal output interface respectively by voltage collection circuit, drive circuit; Balancing unit comprises driving transformer T1, flyback power transformer T2 and device for power switching; The input of driving transformer T1 is connected to drive singal output interface and battery electrode respectively, and the output of driving transformer T1 is connected to device for power switching and monocell negative pole respectively; The positive input terminal of flyback power transformer T2 is connected to monocell positive pole, the negative input end of flyback power transformer T2 is connected with device for power switching, and the positive output end of flyback power transformer T2 is connected to voltage collection circuit and battery anode respectively by diode timesharing isolation;
Single-chip microcomputer comprises controller, and controller is provided with:
Voltage sequencing unit, for sorting to the cell voltage gathered;
Battery capacity converting unit, for being converted into battery capacity by cell voltage;
Pulse computing unit, for calculating the umber of pulse needed for balance corresponding to battery capacity;
Wherein, voltage sequencing unit, battery capacity converting unit are connected in turn with pulse computing unit, and pulse computing unit is connected with drive singal output interface.
2. the battery balancing system based on separated transformer according to claim 1, is characterized in that: balancing unit also comprises the protection and absorb circuit of the input being connected in flyback power transformer T2 in parallel.
3. the battery balancing system based on separated transformer according to claim 2, it is characterized in that: be provided with between the positive input terminal of driving transformer T1 and drive circuit and drive shaping circuit A, be provided with between the positive output end of driving transformer T1 and device for power switching and drive shaping circuit B.
4. the battery balancing system based on separated transformer according to claim 3, is characterized in that: device for power switching adopts N slot field-effect transistor Q1 or bipolarity triode.
5. the battery balancing system based on separated transformer according to claim 4, is characterized in that: device for power switching preferably adopts N slot field-effect transistor Q1.
6. realize the battery balancing method based on separated transformer of system described in any one of Claims 1 to 5, it is characterized in that, comprise the following steps:
S1, singlechip controller drives the balancing unit of each monocell successively by driving transformer T1, postpone after device for power switching is opened certain hour carry out after the collection of terminal voltage record;
S2, singlechip controller, according to the difference of the cell voltage gathered, gives the drive signal impulse number that each battery is different, thus reaches the balance of battery;
Described step S2 specifically comprises:
S21, voltage sequencing unit sorts to the cell voltage gathered;
S22, cell voltage is converted into battery capacity by battery capacity converting unit;
S23, pulse computing unit calculates the umber of pulse needed for balance corresponding to battery capacity;
S24, drive singal output interface sends drive singal according to the balance required pulse number calculated.
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| CN107947282A (en) * | 2017-12-14 | 2018-04-20 | 成都隆航科技有限公司 | A kind of charging circuit for battery equalization system |
Citations (5)
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| CN101345431A (en) * | 2008-08-20 | 2009-01-14 | 东风汽车股份有限公司 | Charging equalization device for series storage battery pack |
| CN101976866A (en) * | 2010-10-17 | 2011-02-16 | 中国船舶重工集团公司第七一二研究所 | Balanced judgment and supplementary device of energy transfer type battery pack and method thereof |
| CN102163854A (en) * | 2011-02-23 | 2011-08-24 | 中航锂电（洛阳）有限公司 | Charge-discharge equalizing circuit of multi-monomer tandem dynamic lithium battery |
| CN102496975A (en) * | 2011-11-10 | 2012-06-13 | 许春香 | Energy bus type battery equalizing circuit |
| CN203039404U (en) * | 2013-01-25 | 2013-07-03 | 天津新智电源有限公司 | Battery balancing system based on independent transformer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101124800B1 (en) * | 2007-02-09 | 2012-03-23 | 한국과학기술원 | Charge Equalization Apparatus |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101345431A (en) * | 2008-08-20 | 2009-01-14 | 东风汽车股份有限公司 | Charging equalization device for series storage battery pack |
| CN101976866A (en) * | 2010-10-17 | 2011-02-16 | 中国船舶重工集团公司第七一二研究所 | Balanced judgment and supplementary device of energy transfer type battery pack and method thereof |
| CN102163854A (en) * | 2011-02-23 | 2011-08-24 | 中航锂电（洛阳）有限公司 | Charge-discharge equalizing circuit of multi-monomer tandem dynamic lithium battery |
| CN102496975A (en) * | 2011-11-10 | 2012-06-13 | 许春香 | Energy bus type battery equalizing circuit |
| CN203039404U (en) * | 2013-01-25 | 2013-07-03 | 天津新智电源有限公司 | Battery balancing system based on independent transformer |
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