CN203026966U - Bidirectional lossless equalization circuit based on forward DC/DC converter - Google Patents
Bidirectional lossless equalization circuit based on forward DC/DC converter Download PDFInfo
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- CN203026966U CN203026966U CN 201220382314 CN201220382314U CN203026966U CN 203026966 U CN203026966 U CN 203026966U CN 201220382314 CN201220382314 CN 201220382314 CN 201220382314 U CN201220382314 U CN 201220382314U CN 203026966 U CN203026966 U CN 203026966U
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Abstract
The utility model discloses a bidirectional lossless equalization circuit based on a forward DC/DC converter. The bidirectional lossless equalization circuit comprises a series-connected battery pack, a positive and negative electrode switching circuit, a matrix switch circuit, a voltage acquisition circuit and a vehicle-mounted 24V lead acid battery. The input end of the forward DC/DC converter is connected with the vehicle-mounted 24V lead acid battery, and the output end of the forward DC/DC converter is connected with the positive and negative electrode switching circuit. One end of the matrix switch circuit is connected with positive and negative electrodes of each single battery of the battery pack, and the other end of the matrix switch circuit is connected with the positive and negative electrode switching circuit. One end of the voltage acquisition circuit is connected with a corresponding single battery of the battery pack through a voltages detection flat cable, and the other end of the voltage acquisition circuit is connected to a main control module. The control signals of the forward DC/DC converter, the positive and negative electrode switching circuit and the matrix switch are inputted to the main control module separately. According to the utility model, the advantage of large equalization current can be realized, the equalization time is shortened, the equalization efficiency is improved, and advantages of simple circuit design, low cost, small size and easy implementation can be realized.
Description
Technical field
The utility model has designed a kind of two-way non-dissipative equalizing circuit based on normal shock DC/DC converter, belongs to the battery protection technical field.
Background technology
Along with the aggravation of energy crisis and environmental pollution, the electric automobile of energy-conserving and environment-protective becomes the focus of research.It is high that dynamic lithium battery has energy density, has extended cycle life, and the automatic releasing rate is low, pollutes the advantages such as little, becomes gradually the first-selected power source of electric automobile.For guaranteeing lithium battery safety, long-life operation, need the dynamic lithium battery group is correctly managed effectively, the performance parameter of dynamic lithium battery group detects and controls becomes the key factor that affects the electric automobile performance.
Three large key technologies of Development of Electric Vehicles are: battery, and motor and automatically controlled, wherein battery is again the most important thing.Although lithium battery technology has had huge progress in recent years, lithium manganate battery, cobalt acid lithium battery, ferric phosphate lithium cell etc. occur in succession, and the lithium battery performance improves obviously; But the inconsistency in the lithium battery group between cell still exists.In the use procedure of battery pack, owing to there are differences between cell, the capacity of battery pack is determined by cell capacity minimum in group.In series battery, although the electric current by each monomer is identical, but due to the difference of its capacity, monomer capacious always can shallowly fill shallow putting, and the little monomer of capacity always can super-charge super-discharge, so just caused monomer decay capacious slowly, life, the monomer decay that capacity is little is accelerated, the lost of life, difference between the two is increasing, causes vicious circle.Therefore, the inefficacy of the battery of low capacity can cause whole battery pack to lose efficacy in advance.
The equalization function of power-supply management system is the interior inconsistency of balanced lithium battery group effectively, scabbles the difference between battery, reduces costs significant for extending the battery pack life-span.
Modal method is at battery two ends bypass resistance in parallel, come the break-make in controlling resistance loop by a switch, when differing greatly between battery, the voltage difference that shows as cell is larger, choose the higher partial monosomy battery of voltage, resistance loop that can be by control switch conducting parallel connection discharges a part with its energy, finally makes the voltage difference between each cell maintain in a rational scope.Consume in vain because electric weight unnecessary in cell is bypassed resistance, so cause the waste of the energy content of battery, conductive discharge can produce larger heat, therefore adopt the euqalizing current of this mode also less.
The utility model content
The purpose of this utility model is the weak point that overcomes existing equalization scheme, provides a kind of and can carry out the two-way harmless transfer of energy, and euqalizing current is large, the non-dissipative equalizing circuit based on normal shock DC/DC converter that balanced efficient is high.
The technical solution adopted in the utility model is:
a kind of two-way non-dissipative equalizing circuit based on normal shock DC/DC converter, include normal shock DC/DC converter, normal shock DC/DC converter includes two-way forward converter and active clamping circuir, it is characterized in that: the battery pack that also includes series connection, the both positive and negative polarity commutation circuit, switch matrix circuit, voltage collection circuit and vehicle-mounted 24V lead-acid battery, the input of normal shock DC/DC converter is connected with vehicle-mounted 24V lead-acid battery, its output is connected with the both positive and negative polarity commutation circuit, switch matrix circuit one end is connected with the both positive and negative polarity of each battery cell of battery pack, the other end is connected with the both positive and negative polarity commutation circuit, voltage collection circuit one end is connected with the corresponding battery cell of battery pack by the voltage detecting winding displacement, other end access main control module, normal shock DC/DC converter, the control signal of both positive and negative polarity commutation circuit and matrix switch accesses in main control module respectively.
The matrix switch of switch matrix circuit adopts N to select 1 matrix, and the one end is connected to by the voltage detecting winding displacement on the both positive and negative polarity of corresponding battery cell, and the other end is connected with the both positive and negative polarity commutation circuit.Main control module is comprised of the MCU single-chip microcomputer, its input port receives the voltage signal that gathers from voltage collection circuit, and section carries out A/D conversion within it, and the control signal of 1 matrix switch, both positive and negative polarity commutation circuit and normal shock DC/DC converter is selected in its output port output to N.
Operation principle of the present utility model is:
The utility model carries out Real-Time Monitoring by main control module MCU single-chip microcomputer and Acquisition Circuit cooperating to the voltage of cell, obtains the real time data of each monomer battery voltage, and determines the position of the highest and minimum cell.During the threshold value set higher than us when the voltage of cell, main control module enables corresponding switch matrix circuit, both positive and negative polarity commutation circuit and normal shock DC/DC converter, and at this moment corresponding cell both positive and negative polarity is connected to the output of normal shock DC/DC converter by matrix switch, both positive and negative polarity commutation circuit.Then turn back in vehicle-mounted 24V lead-acid battery by the unnecessary electric weight of normal shock DC/DC converter with battery cell; During the threshold value set lower than us when the voltage of cell, main control module enables corresponding switch matrix circuit, both positive and negative polarity commutation circuit and normal shock DC/DC converter, make under-voltage monomer both positive and negative polarity be connected to the output of normal shock DC/DC converter, the electric weight in vehicle-mounted 24V lead-acid battery can be transferred in under-voltage cell by normal shock DC/DC converter at this moment.Said process repeats, and makes that in battery pack, the pressure reduction of cell remains in a rational scope, namely the cell of battery pack keep one well harmonious.
Compared with prior art, advantage applies of the present utility model exists:
1, in equilibrium, unnecessary electric weight is transferred in vehicle-mounted 24V lead-acid battery, has avoided the waste of electric weight;
2, under-voltage monomer can obtain corresponding electric weight by vehicle-mounted 24V lead-acid battery, has realized bidirectional equalization, makes cell remain on a well harmony;
3, euqalizing current is large, makes time for balance shorten, and has improved balanced efficient;
4, circuit design is simple, and cost is low, and volume is little, is easy to realize.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
as shown in Figure 1, a kind of two-way non-dissipative equalizing circuit based on normal shock DC/DC converter, include normal shock DC/DC converter 1, normal shock DC/DC converter 1 includes two-way forward converter 2 and active clamping circuir 3, also include the battery pack 4 of series connection, both positive and negative polarity commutation circuit 5, switch matrix circuit 6, voltage collection circuit 7 and vehicle-mounted 24V lead-acid battery 8, the input of normal shock DC/DC converter 1 is connected with vehicle-mounted 24V lead-acid battery 8, its output is connected with the SQ1 ~ SQ of both positive and negative polarity commutation circuit 5, matrix switch element S1 ~ Sn one end of switch matrix circuit 6 is connected with the both positive and negative polarity of each battery cell B1 ~ Bn of battery pack 4, the other end is connected with the SQ1 ~ SQ4 of both positive and negative polarity commutation circuit 5, voltage collection circuit 7 one ends are connected with the corresponding battery cell of battery pack 4 by voltage detecting winding displacement 9, the CR1 input port place of other end access main control module 10, the two-way forward converter 2 of normal shock DC/DC converter 1 and the control end of active clamping circuir 3 access respectively main control module MCU single-chip microcomputer K9 ~ K11 output port, both positive and negative polarity commutation circuit 5 and matrix switch 6 control end access respectively main control module 10MCU single-chip microcomputer K1 ~ K8 port.
Its course of work is:
System powers on, immediately according to the program operation of setting.At this moment, each monomer battery voltage in 7 pairs of battery pack 4 of voltage collection circuit carries out circle collection, and the voltage signal that gathers is passed in main control module 10, and carries out the A/D conversion in main control module 10.
If t0 is when constantly main control module 10 detects the threshold voltage that a certain joint monomer battery voltage sets lower than us (explanation as an example of cell B2 example), namely cell was crossed and was put this moment, was in under-voltage condition.The MCU single-chip microcomputer output port K6 of main control module 10, K7, K2, K3 sends enable signal, the both positive and negative polarity of cell B2 is by the voltage detecting winding displacement like this, switch matrix circuit 6 and both positive and negative polarity commutation circuit 5 have been connected to the output of normal shock DC/DC converter 1, and the MCU single-chip microcomputer output port K11 of main control module 10 also sends enable signal simultaneously, make the switching tube Q1 of normal shock DC/DC converter 1 primary side closed.At this moment, the Same Name of Ends of normal shock DC/DC converter one side winding and secondary side winding with respect to the different name end for just.Like this electric current just by the positive pole of vehicle-mounted 24V lead-acid battery through port P+, and through filter capacitor C1 effect, along the primary side Transformer Winding of normal shock DC/DC converter 1 and the switching tube of primary side, then arrive its negative pole from port P-.The electric current of the secondary side of normal shock DC/DC converter 1 flows out to L1 from the Same Name of Ends of secondary side winding, in C3.Both positive and negative polarity commutation circuit 5 through having connected after this part electric current is exported from the Same Name of Ends of the secondary side winding of normal shock DC/DC converter 1, switch matrix circuit 6 flows in battery cell B2, and returns to the different name end of secondary side winding from the secondary side switches pipe Q3 parasitic diode of normal shock DC/DC converter 1.Elapsed time T1(switch periods) afterwards, the output port K11 output low level of the single-chip microprocessor MCU of main control module 10, this level is closed the switching tube Q1 of normal shock DC/DC converter primary side, the Same Name of Ends of the primary side of normal shock DC/DC converter 1 and secondary side winding is negative with respect to the different name end at this moment, and the different name terminal voltage of shutdown moment first side winding is about the vehicle-mounted 24V lead-acid battery voltage of 2 times.Because inductance L 1 electric current can not suddenly change, so the pole reversal of inductance is to keep electric current constant as far as possible.Inductance L 1 electric current flows this moment in the same direction, flows out from its output, returns to inductance L 1 through overload (part is through filtering capacitor C 3) and sustained diode 1.The MCU single-chip microcomputer output port K10 of main control module 10 sends enable signal simultaneously, make the reset switch pipe Q2 conducting of active clamping circuir 3, exciting current is transferred to from Q1 and is flow through active clamping circuir clamping capacitance C2 and reset switch pipe Q2 like this, and when moment t1, current reduction in magnetizing inductance is to zero, begin simultaneously to set up in opposite direction electric current, this electric current derives from clamping capacitance C1, get back to take-off potential Deng clamping capacitance C2 voltage, and the magnetizing current amplitude when finishing resetting time reaches the level (polarity opposite) identical with beginning electric current resetting time.At this moment, main control module 10 is controlled the primary side switching tube Q1 conducting of normal shock DC/DC converter 1, and reset switch Q2 closes, and this is a work period.Such process will repeat, until the voltage of under-voltage monomer arrives normal level.
if t0 constantly main control module 10 voltage that a certain joint cell detected set higher than us threshold voltage the time (take cell B2 as example), namely this moment, monomer overcharged, the MCU single-chip microcomputer K6 of main control module 10, K7, K2, K3 sends enable signal, the both positive and negative polarity of cell B2 is by the voltage detecting winding displacement like this, switch matrix circuit 6 and both positive and negative polarity commutation circuit 5 are connected to the output of normal shock DC/DC converter 1, the MCU single-chip microcomputer output port K9 of main control module 10 also sends enable signal simultaneously, make the switching tube Q3 closure of the secondary side of normal shock DC/DC converter 1, this just has electric current to pass through from the positive pole of battery cell B2, the winding of the secondary side of normal shock DC/DC converter 1 and the switching tube Q3 of converter secondary side flow to negative pole, this moment normal shock DC/DC converter 1 primary side and secondary side winding Same Name of Ends with respect to the different name end for just, the electric current of the primary side of normal shock DC/DC converter 1 is by winding and the primary side switching tube Q1 of primary side like this, and flow in vehicle-mounted 24V lead-acid battery through the effect of filtering capacitor C 1.After elapsed time T2, main control module MCU single-chip microcomputer output port K9 sends low level, this moment, the switching tube Q3 of secondary side disconnected, the different name end of normal shock DC/DC converter primary side and secondary side winding with respect to Same Name of Ends for just, because the capacitor C 1 of primary side has stored portion of energy in primary side conduction period, at this moment it will discharge, and by port P+, P-delivers in vehicle-mounted 24V lead-acid battery.And when moment t2, main control module makes secondary side switches pipe Q3 conducting again, and this is a work period.Such process will repeat, and return to normal level until overcharge the voltage of monomer.
In sum, be a kind of operation principle of the two-way non-dissipative equalizing circuit based on normal shock DC/DC converter, namely when the battery cell electric weight is too much, allow unnecessary electric weight transfer in vehicle-mounted 24V lead-acid battery, when the battery cell electric weight is too low, allow the electric weight in vehicle-mounted 24V lead-acid battery transfer in under-voltage battery cell.
Claims (3)
1. two-way non-dissipative equalizing circuit based on normal shock DC/DC converter, include normal shock DC/DC converter, normal shock DC/DC converter includes two-way forward converter and active clamping circuir, it is characterized in that: the battery pack that also includes series connection, the both positive and negative polarity commutation circuit, switch matrix circuit, voltage collection circuit and vehicle-mounted 24V lead-acid battery, the input of normal shock DC/DC converter is connected with vehicle-mounted 24V lead-acid battery, its output is connected with the both positive and negative polarity commutation circuit, switch matrix circuit one end is connected with the both positive and negative polarity of each battery cell of battery pack, the other end is connected with the both positive and negative polarity commutation circuit, voltage collection circuit one end is connected with the corresponding battery cell of battery pack by the voltage detecting winding displacement, other end access main control module, normal shock DC/DC converter, the control signal of both positive and negative polarity commutation circuit and matrix switch accesses in main control module respectively.
2. the two-way non-dissipative equalizing circuit based on normal shock DC/DC converter according to claim 1, is characterized in that: described main control module employing MCU single-chip microcomputer.
3. the two-way non-dissipative equalizing circuit based on normal shock DC/DC converter according to claim 1 is characterized in that: the matrix switch of described switch matrix circuit adopts N to select 1 matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220382314 CN203026966U (en) | 2012-08-03 | 2012-08-03 | Bidirectional lossless equalization circuit based on forward DC/DC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220382314 CN203026966U (en) | 2012-08-03 | 2012-08-03 | Bidirectional lossless equalization circuit based on forward DC/DC converter |
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| CN203026966U true CN203026966U (en) | 2013-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220382314 Expired - Lifetime CN203026966U (en) | 2012-08-03 | 2012-08-03 | Bidirectional lossless equalization circuit based on forward DC/DC converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904296A (en) * | 2012-08-03 | 2013-01-30 | 安徽力高新能源技术有限公司 | Two-way no-wear equalization circuit based on normal shock DC (Direct Current) /DC convertor |
-
2012
- 2012-08-03 CN CN 201220382314 patent/CN203026966U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904296A (en) * | 2012-08-03 | 2013-01-30 | 安徽力高新能源技术有限公司 | Two-way no-wear equalization circuit based on normal shock DC (Direct Current) /DC convertor |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Room 501, No. 8, No. 300, Changjiang Road, Yantai Economic and Technological Development Zone, Shandong Province Patentee after: LIGO (Shandong) New Energy Technology Co.,Ltd. Address before: 416 room 605, min Chong Center, 230088 Mount Huangshan Road, Hefei high tech Zone, Anhui, China Patentee before: ANHUI LIGOO NEW ENERGY TECHNOLOGY Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130626 |