CN103208919A - Direct current converting circuit and battery managing system - Google Patents
Direct current converting circuit and battery managing system Download PDFInfo
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- CN103208919A CN103208919A CN2013100666605A CN201310066660A CN103208919A CN 103208919 A CN103208919 A CN 103208919A CN 2013100666605 A CN2013100666605 A CN 2013100666605A CN 201310066660 A CN201310066660 A CN 201310066660A CN 103208919 A CN103208919 A CN 103208919A
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Abstract
The invention provides a direct current converting circuit and a battery managing system. The direct current converting circuit comprises a direct current converting unit, a current detecting unit and a feedback control unit. A high-voltage side of the direct current converting unit is used for being connected with a high-voltage side energy storage unit, and a low-voltage side of the direct current converting unit is used for being connected with a low-voltage side energy storage unit. The current detecting unit is used for detecting current input by the direct current converting unit into a bus and providing the current for the feedback control unit. The feedback control unit is used for controlling direct current conversion performed by the direct current converting circuit according to the current input by the e direct current converting unit into the bus. The direct current converting circuit can achieve smooth transition of the charging process and the discharging process and can improve the electric quantity balancing precision and the electric quantity balancing accuracy of the energy storage units.
Description
Technical field
The present invention relates to power management techniques, relate in particular to a kind of DC transfer circuit and battery management system.
Background technology
At present, the large power energy storage device all adopts LiFePO4 or lithium manganese phosphate battery as energy-storage units, because the finite capacity of single-unit electricity core, so the large power energy storage device is made up of a plurality of single-unit electricity cores.The electric core parallel connection of some is encapsulated into a cell, and the cell Series Package with some becomes a power brick again, provides power supply with a plurality of power brick series connection back for load at last.Because in the production process of cell, electric weight and the internal resistance that can not guarantee each cell are in full accord, and energy storage device in use, along with the increase that discharges and recharges number of times, the chemical composition of cell inside can go bad, and makes that the difference of each cell state-of-charge is increasing.Therefore in the process of energy storage device charging, some cell can occur and be full of, and some cell situation of underfill also if continue charging, then can make the cell that has been full of overcharge, and causes the performance of this cell seriously to descend.In the process of energy storage device discharge, some cell discharge off can occur, and some cell situation of dump energy also if continue discharge, then can make the cell over-discharge can of discharge off, causes the performance of battery to descend.Therefore, in the charge and discharge process of energy storage device, need to adopt certain balance adjustment mode, so that the electric weight of each cell keeps balance, improve the performance of energy storage device, increase the service life.
Usually the balance adjustment mode that adopts mainly contains passive equilibrium and active balancing, wherein the mode of active balancing adopts multi winding transformer to be arranged between cell and the power brick, the primary coil of multi winding transformer is connected with power brick with cell respectively with secondary coil, makes energy transmitted in both directions between cell and power brick.But because the multi winding transformer own vol is bigger, shock resistance is relatively poor, and interference is comparatively serious between each winding of transformer, makes that the degree of regulation of above-mentioned active balancing technology and accuracy are lower.
Summary of the invention
The invention provides a kind of DC transfer circuit and battery management system, to improve precision and the accuracy of energy storage device electric quantity balancing.
The embodiment of the invention provides a kind of DC transfer circuit, comprising: DC converting unit, current detecting unit and feedback control unit;
The high-pressure side of described DC converting unit is used for being connected with the high-pressure side energy-storage units, and the low-pressure side of described DC converting unit is used for being connected with the low-pressure side energy-storage units;
Described current detecting unit is for detection of the electric current of described DC converting unit inlet highway and offer described feedback control unit;
Described feedback control unit is used for carrying out DC converting according to the described DC converting of the Current Control unit of described DC converting unit inlet highway.
The DC transfer circuit that the embodiment of the invention provides, adopt current detecting unit to detect the electric current of DC converting unit inlet highway, and carry out DC converting by feedback control unit according to the current-controlled dc converter unit of this inlet highway, make and to carry out level and smooth energy transfer between high-pressure side energy-storage units and the low-pressure side energy-storage units, improved precision and the accuracy of electric quantity balancing between each energy storage device.
The embodiment of the invention provides a kind of battery management system, comprises aforesaid DC transfer circuit;
Also comprise: AFE (analog front end), switching device driver module and battery management controller;
Described AFE (analog front end) is connected with the battery management controller with described low-pressure side energy-storage units respectively, is used for the state of the described low-pressure side energy-storage units of monitoring, and the status monitoring result is offered described battery management controller;
The input of described switching device driver module is connected with described impulse generator, and the output of described switching device driver module is connected with the control end of described high side switch device and the control end of low-side switch device respectively;
Described battery management controller and described state of a control machine communicate to connect.
The battery management system that the embodiment of the invention provides, adopt current detecting unit to detect the electric current of DC converting unit inlet highway, jointly the state of energy-storage units is detected with AFE (analog front end), realize break-make by the switching device that battery management controller and feedback control unit are controlled in each DC converting unit, make that can carry out level and smooth energy between high-pressure side energy-storage units and the low-pressure side energy-storage units shifts, so that the charging/discharging voltage of each the low-pressure side energy-storage units in each battery management system is consistent, improved precision and the accuracy of electric quantity balancing between each energy storage device.
Description of drawings
The structural representation of the DC transfer circuit that Fig. 1 provides for the embodiment of the invention;
The structural representation of another DC transfer circuit that Fig. 2 provides for the embodiment of the invention;
The structural representation of the another DC transfer circuit that Fig. 3 provides for the embodiment of the invention;
The structural representation of the another DC transfer circuit that Fig. 4 provides for the embodiment of the invention;
The structural representation of the another DC transfer circuit that Fig. 5 provides for the embodiment of the invention;
The structural representation of the another DC transfer circuit that Fig. 6 provides for the embodiment of the invention;
Fig. 7 is the current direction schematic diagram of the low-pressure side charging of DC transfer circuit among Fig. 4;
Fig. 8 is another schematic diagram of current direction of the low-pressure side charging of DC transfer circuit among Fig. 4;
Fig. 9 is the another schematic diagram of current direction of the low-pressure side charging of DC transfer circuit among Fig. 4;
Figure 10 is the current direction schematic diagram of the low-pressure side discharge of DC transfer circuit among Fig. 4;
Figure 11 is another schematic diagram of current direction of the low-pressure side discharge of DC transfer circuit among Fig. 4;
Figure 12 is the another schematic diagram of current direction of the low-pressure side discharge of DC transfer circuit among Fig. 4;
Figure 13 is the driving pulse schematic diagram of switching device among Fig. 4;
Figure 14 discharges and recharges the flow process schematic diagram for state of a control machine among Fig. 5;
Figure 15 is the charging or discharging current analogous diagram of state of a control machine among Fig. 5;
Figure 16 is current detecting unit detected electric current change curve in charge and discharge process among Fig. 5;
Figure 17 for current detecting unit among Fig. 5 at detected electric current change curve of the moment that discharges and recharges beginning;
The structural representation of the battery management system that Figure 18 provides for the embodiment of the invention.
Embodiment
The structural representation of the DC transfer circuit that Fig. 1 provides for the embodiment of the invention.As shown in Figure 1, DC transfer circuit comprises: DC converting unit 1, current detecting unit 2 and feedback control unit 3.
Wherein, the high-pressure side of DC converting unit 1 is used for being connected with high-pressure side energy-storage units 4, and the low-pressure side of DC converting unit 1 is used for being connected with low-pressure side energy-storage units 41; Current detecting unit 2 is for detection of the electric current of DC converting unit 1 inlet highway and offer feedback control unit 3; Feedback control unit 3 is used for carrying out DC converting according to the current-controlled dc converter unit 1 of DC converting unit 1 inlet highway.
Concrete, the on high-tension side positive pole of DC converting unit 1 is connected with the positive pole of high-pressure side energy-storage units 4, on high-tension side negative pole is connected with the negative pole of high-pressure side energy-storage units 4, the positive pole of the low-pressure side of DC converting unit 1 is connected with the positive pole of low-pressure side energy-storage units 41, and the negative pole of low-pressure side is connected with the negative pole of low-pressure side energy-storage units 41.High-pressure side energy-storage units 4 and low-pressure side energy-storage units 41 can be energy storage devices such as Ni-MH battery, nickel-cadmium cell, lead-acid battery, lithium ion battery and super capacitor, and 1 realization energy is changed between high-pressure side energy-storage units 4 and low-pressure side energy-storage units 41 through the DC converting unit.
Current detecting unit 2 can adopt current detecting device commonly used in the prior art, and for example the current sensor of electromagnetic induction, Hall effect and other types also can adopt series resistance to survey voltage method and measure electric current.The gallon end of current detecting unit 2 can be connected to the on high-tension side negative or positive electrode inlet highway of DC converting unit 1, the perhaps negative or positive electrode inlet highway of the low-pressure side of DC converting unit 1, concrete connected mode needs to connect in mode well known to those skilled in the art according to the current sensor model of selecting for use.When having energy to shift between high-pressure side energy-storage units 4 and the low-pressure side energy-storage units 41, current detecting unit 2 can measure the electric current of DC converting unit 1 arbitrary end inlet highway, and offers feedback control unit 3.Concrete, the signal output part of current detecting unit 2 is connected with feedback control unit 3, and concrete connected mode needs equally according to the current sensor model of selecting for use, connects in mode well known to those skilled in the art.Current detecting unit 2 sends the detected current signal of gallon end to feedback control unit 3, so that 3 pairs of these current signals of feedback control unit are analyzed and are handled, generate control command and control signal, be used for control DC converting unit 1 and carry out DC converting.
Referring to figs. 2 to Fig. 6, the structural representation of another DC transfer circuit that Fig. 2 provides for the embodiment of the invention, the structural representation of the another DC transfer circuit that Fig. 3 provides for the embodiment of the invention, the structural representation of the another DC transfer circuit that Fig. 4 provides for the embodiment of the invention, the structural representation of the another DC transfer circuit that the structural representation of the another DC transfer circuit that Fig. 5 provides for the embodiment of the invention, Fig. 6 provide for the embodiment of the invention.Above-mentioned DC converting unit 1 can comprise: the low-side switch device 12 of the high side switch device 11 of built-in fly-wheel diode, built-in fly-wheel diode, high-pressure side inductance 13, low-pressure side inductance 14, first isolation capacitance 15 and second isolation capacitance 16.
Wherein, high side switch device 11 and low-side switch device 12 can be bipolar transistor, insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, be called for short IGBT) and metal oxide layer semiconductor field-effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, be called for short MOSFET) wait switching device, the driving signal realization turn-on and turn-off of sending according to feedback control unit 3.High side switch device 11 in the present embodiment and low-side switch device 12 adopt MOSFET, wherein, the control end of high side switch device 11 is the grid of MOSFET, be connected to feedback control unit 3, the source electrode of MOSFET is as the output of high side switch device 11, the drain electrode of MOSFET is as the input of high side switch device 11, the drain electrode of MOSFET and source electrode are connected to the both positive and negative polarity of high-pressure side energy-storage units 4 respectively, and the circuit that is connected between high side switch device 11 and the high-pressure side energy-storage units 4 is as the high-pressure side inlet highway.When the grid of MOSFET receives the high level signal that feedback control unit 3 sends, the drain electrode of MOSFET and source electrode conducting, also be input and the output conducting of high side switch device 11, when the grid of MOSFET receives the low level signal that feedback control unit 3 sends, the drain electrode of MOSFET and source electrode turn-off, and also are that input and the output of high side switch device 11 turn-offs.The connected mode of low-side switch device 12 and operation principle and high side switch device 11 are similar, repeat no more herein.High side switch device 11 also comprises built-in high-pressure side fly-wheel diode 111, and the negative pole of the high-pressure side fly-wheel diode 111 in the present embodiment is connected with the drain electrode of high-pressure side MOSFET, and positive pole is connected with the source electrode of high-pressure side MOSFET.Low-side switch device 12 also comprises built-in low-pressure side fly-wheel diode 121, and the negative pole of the low-pressure side fly-wheel diode 121 in the present embodiment is connected with the drain electrode of low-pressure side MOSFET, and positive pole is connected with the source electrode of low-pressure side MOSFET.
The positive pole of first isolation capacitance 15 is connected with the input of high side switch device 11, negative pole is connected with the output of low-side switch device 12, the negative pole of second isolation capacitance 16 is connected with the output of high side switch device 11, and positive pole is connected with the input of low-side switch device 12.High-pressure side inductance 13 is serially connected on the DC converting unit 1 on high-tension side inlet highway, and low-pressure side inductance 14 is serially connected on the inlet highway of DC converting unit 1 low-pressure side.The quantity of high-pressure side inductance 13 preferably can be two, is connected in series respectively to the inlet highway of the inlet highway of DC converting unit 1 high-pressure side positive pole and negative pole; The quantity of low-pressure side inductance 14 also can be two, is connected in series respectively to the inlet highway of the inlet highway of DC converting unit 1 low-pressure side positive pole and negative pole, can reduce the current ripples in the circuit.Be example with the inductance that is connected in series the anodal inlet highway to 1 high-pressure side, DC converting unit, an end of this inductance is connected with the drain electrode of high-pressure side MOSFET, and the other end is connected with the positive pole of high-pressure side energy-storage units 4, and the connected mode of other inductance can adopt similar method.
On the basis of technique scheme, DC converting unit 1 can also comprise: high-pressure side filter capacitor 17 and low-pressure side filter capacitor 18.Wherein, the positive pole of high-pressure side filter capacitor 17 is connected with the inlet highway of the high-pressure side positive pole of DC converting unit 1, negative pole is connected with the inlet highway of the high-pressure side negative pole of DC converting unit 1, the positive pole of low-pressure side filter capacitor 18 is connected with the inlet highway of the low-pressure side positive pole of DC converting unit 1, and negative pole is connected with the inlet highway of the low-pressure side negative pole of DC converting unit 1.High-pressure side filter capacitor 17 and low-pressure side filter capacitor 18 are set, the mutation voltage in can filtering circuit in DC converting unit 1.
For the high-pressure side of measuring DC converting unit 1 respectively and the electric current of low-pressure side inlet highway, then can in high-pressure side and low-pressure side current detecting unit 2 be set respectively.Simultaneously, current control module 31 also comprises passage diverter switch 314.The input of passage diverter switch 314 is connected with each current detecting unit, concrete, an input of passage diverter switch 314 is connected with the signal output part of a current detecting unit, the control end of passage diverter switch 314 is connected with state of a control machine 313, receive the gating signal that state of a control machine 313 sends, switch input channel according to this gating signal, insert adder 311 with the signal with the current detecting unit 2 of state of a control machine 313 appointments.When need are controlled the on high-tension side charging and discharging currents of DC converting unit 1, the signal that is connected on high-tension side current detecting unit is inserted adder 311, when the charging and discharging currents of the low-pressure side of need control DC converting unit 1, the signal that is connected the current detecting unit of low-pressure side is inserted adder 311, to improve the accuracy of electric current.Passage diverter switch 314 can adopt ADG1634 analog switch or AD7294 sampling, perhaps adopts relay etc.
With reference to figure 7 to Fig. 9, Fig. 7 is the current direction schematic diagram of the low-pressure side charging of DC transfer circuit, Fig. 8 is another schematic diagram of current direction of the low-pressure side charging of DC transfer circuit, and Fig. 9 is the another schematic diagram of current direction of the low-pressure side charging of DC transfer circuit.The charging process of the low-pressure side energy-storage units 41 of DC converting unit 1 is as follows:
Under the circuit stable situation, at first high-pressure side MOSFET conducting, alive in the loop of being made up of high-pressure side energy-storage units 4, high-pressure side inductance 13 and high-pressure side MOSFET, the current in loop direction is flowed to the negative pole of high-pressure side energy-storage units 4 by the positive pole of high-pressure side energy-storage units 4.Simultaneously, because DC transfer circuit in the course of the work, itself there is electric charge on first isolation capacitance 15 and second isolation capacitance 16, therefore first isolation capacitance 15 and 16 series connection of second isolation capacitance, charge to low-pressure side energy-storage units 41 through low-pressure side inductance 14 and high-pressure side fly-wheel diode 111, the sense of current of charging is flowed to the positive pole of low-pressure side energy-storage units 41 by the negative pole of low-pressure side energy-storage units 41.High-pressure side MOSFET turn-offs then, and owing to the electric current on the inductance can not suddenly change, so the sense of current that passes through in high-pressure side inductance 13 and the low-pressure side inductance 14 remains unchanged 121 conductings of low-pressure side fly-wheel diode.Form the low-pressure side loop by low-pressure side fly-wheel diode 121, low-pressure side inductance 14 and low-pressure side energy-storage units 41, the sense of current in loop flows to the positive pole of low-pressure side energy-storage units 41 by the negative pole of low-pressure side energy-storage units 41, and namely low-pressure side energy-storage units 41 is in charged state.And high-pressure side energy-storage units 4 charges to first isolation capacitance 15 and second isolation capacitance 16 through high-pressure side inductance 13.The turn-on and turn-off of high-pressure side MOSFET have realized the process to 41 chargings of low-pressure side energy-storage units.
Preferably, after the time, 12 conductings of low-side switch device have further reduced the conducting resistance in the low-pressure side loop at low-pressure side fly-wheel diode 121 conductings one end, reduce power consumption, can improve the conversion efficiency of DC converting unit 1, realize synchronous rectification.
With reference to figures 10 to Figure 12, Figure 10 is the current direction schematic diagram of the low-pressure side discharge of DC transfer circuit, Figure 11 is another schematic diagram of current direction of the low-pressure side discharge of DC transfer circuit, and Figure 12 is the another schematic diagram of current direction of the low-pressure side discharge of DC transfer circuit.The discharge process of the low-pressure side energy-storage units 41 of DC converting unit 1 is as follows:
Under the circuit stable situation, at first low-pressure side MOSFET conducting, alive in the loop of being formed by low-pressure side energy-storage units 41, low-pressure side inductance 14 and low-pressure side MOSFET, the current in loop direction flows to the negative pole of low-pressure side energy-storage units 41 by the positive pole of low-pressure side energy-storage units 41, and namely low-pressure side energy-storage units 41 is in discharge condition.Simultaneously, because DC transfer circuit in the course of the work, itself there is electric charge on first isolation capacitance 15 and second isolation capacitance 16, therefore first isolation capacitance 15 and 16 series connection of second isolation capacitance, charge to high-pressure side energy-storage units 4 through high-pressure side inductance 13 and low-pressure side fly-wheel diode 121, the sense of current of charging is flowed to the positive pole of high-pressure side energy-storage units 4 by the negative pole of high-pressure side energy-storage units 4.Low-pressure side MOSFET turn-offs then, and owing to the electric current on the inductance can not suddenly change, so the sense of current that passes through in high-pressure side inductance 13 and the low-pressure side inductance 14 remains unchanged 111 conductings of high-pressure side fly-wheel diode.Form the loop, high-pressure side by high-pressure side fly-wheel diode 111, high-pressure side inductance 13 and high-pressure side energy-storage units 4, the sense of current in loop flows to the positive pole of high-pressure side energy-storage units 4 by the negative pole of high-pressure side energy-storage units 4, and namely high-pressure side energy-storage units 4 is in charged state.And low-pressure side energy-storage units 41 charges to first isolation capacitance 15 and second isolation capacitance 16 through low-pressure side inductance 14.The turn-on and turn-off of low-pressure side MOSFET have realized 41 discharges of low-pressure side energy-storage units, to the process of high-pressure side energy-storage units 4 chargings.
Preferably, after the time, 11 conductings of high side switch device have further reduced the conducting resistance in the loop, high-pressure side at high-pressure side fly-wheel diode 111 conductings one end, reduce power consumption, can improve the conversion efficiency of DC converting unit 1, realize synchronous rectification.
Figure 13 is the driving pulse schematic diagram of switching device, and as shown in figure 13, first pulse 101 is the drive pulse waveform of high-pressure side MOSFET, and second pulse 102 is the drive pulse waveform of low-pressure side MOSFET.The Dead Time 1021 of the Dead Time 1011 that switch periods is high-pressure side MOSFET, the ON time 1012 of high-pressure side MOSFET, low-pressure side MOSFET and the temporal summation of the ON time 1022 of low-pressure side MOSFET.According to the charge and discharge process of above-mentioned low-pressure side energy-storage units 41, under the synchronous rectification pattern, pulse duration has determined the sense of current of DC converting unit 1 and the charging and discharging state of energy-storage units as can be known.Therefore, can pass through feedback control unit 3 regulating impulse width, make the current average of high-pressure side and low-pressure side input equate with the current average of feedback, total current in the holding circuit is zero, the pulse width values of this moment becomes balance point, pulse duration more departs from this balance point, and charging and discharging currents is more big.In the starting stage that DC transfer circuit starts, in order to reduce electromagnetic interference, can adjust output current progressively increases/reduces by zero, thereby realizes soft start.The pulse duration of balance point can calculate according to the magnitude of voltage at high-pressure side and low-pressure side two ends and known DC transfer circuit system model.
Figure 14 discharges and recharges the flow process schematic diagram for the state of a control machine, and as shown in figure 14, the initial condition of state of a control machine 313 is idle condition, and waits for external command.External command to be received, state of a control machine 313 configuration driven pulse durations are balance point, make DC transfer circuit enter zero current condition.This moment, state of a control machine 313 judgement external commands were charge command or discharge order, if charge command, then state of a control machine 313 is controlled high-pressure side MOSFET and low-pressure side MOSFET break-makes, enter the slow propradation of electric current, constant charge, electric current slowly descend state, zero current condition successively, get back to idle condition at last; If discharge condition, then state of a control machine 313 control high-pressure side MOSFET and low-pressure side MOSFET break-makes enter electric current slowly descend state, stable discharging, the slow propradation of electric current, zero current condition successively, get back to idle condition at last.
Figure 15 is the charging or discharging current analogous diagram of state of a control machine, and Figure 16 is current detecting unit detected electric current change curve in charge and discharge process.As shown in figure 15, current detecting unit 2 is arranged on the low-pressure side of DC converting unit 1, detect the electric current of low-pressure side inlet highway, last figure is current detecting unit 2 detected actual currents, the reference current that figure below provides for state of a control machine 313, the gain of current detecting unit 2 is 0.2, namely provides the reference current that numerical value is 1A, and the actual current of low-pressure side inlet highway is 5A.Under initial condition, reference current is 0A, and circuit is in balance point, and MOSFET begins to carry out switch and switches under the control of feedback control unit 3.Reference current slowly rises then, and under the control of feedback control unit 3, the driving pulse width of high side switch device 11 increases, and the driving pulse width of low-side switch device 12 reduces, so that low-pressure side energy-storage units 41 is in charged state.When reference current reaches 1A, stablize a period of time, charging current also is stabilized in 5A.Reference current descends afterwards, and charging current also descends thereupon, and after waiting to drop to 0A, the driving pulse width of low-side switch device 12 increases, and the driving pulse width of high side switch device 11 reduces, and makes low-pressure side energy-storage units 41 be in discharge condition.When reference current reach-during 1A, stablize a period of time, charging current also is stabilized in-5A.Reference current rises afterwards, and charging current also rises thereupon.The DC transfer circuit that present embodiment provides can be implemented between charge cycle and the discharge cycle and take over seamlessly arbitrarily, and circuit loss is lower.The current waveform figure of above-mentioned charging and discharge process can be with reference to Figure 16, and the picture left above is that electric current slowly rises among Figure 16, and top right plot is constant charge, and lower-left figure is that electric current slowly descends, and bottom-right graph is stable discharging.
Figure 17 for current detecting unit at detected electric current change curve of the moment that discharges and recharges beginning, be the partial enlarged drawing of Figure 15.Last figure among Figure 17 is the oscillogram of charging current soft start to constant charge, and figure below is the oscillogram of discharging current soft start to stable discharging.The DC transfer circuit that present embodiment provides can have good dynamic characteristics with overshoot control in 0.01A/5A=0.2%.
The DC transfer circuit that the embodiment of the invention provides adopts current detecting unit to detect the electric current of DC converting unit inlet highway, and carry out DC converting by feedback control unit according to the current-controlled dc converter unit of this inlet highway, make and to carry out level and smooth energy transfer between high-pressure side energy-storage units and the low-pressure side energy-storage units, improved precision and the accuracy of electric quantity balancing between each energy storage device.
The structural representation of the battery management system that Figure 18 provides for the embodiment of the invention, as shown in figure 18, battery management system comprises the DC transfer circuit that above-described embodiment provides, and also comprises in addition: AFE (analog front end) 5, switching device driver module 6 and battery management controller 7.
Wherein, AFE (analog front end) 5 is connected with battery management controller 7 with low-pressure side energy-storage units 41 respectively, is used for the state of monitoring low-pressure side energy-storage units 41, and the status monitoring result is offered battery management controller 7.The input of switching device driver module 6 is connected with impulse generator 32, and the output of switching device driver module 6 is connected with the control end of high side switch device 11 and the control end of low-side switch device 12 respectively.Battery management controller 7 communicates to connect with state of a control machine 313.The quantity of DC converting unit 1 is a plurality of, and a plurality of low-pressure side energy-storage units 41 is formed high-pressure side energy-storage units 4.Can also comprise a plurality of high-pressure sides energy-storage units 4 in the battery management system, can control a plurality of high-pressure sides energy-storage units 4, make charging voltage or the discharge voltage of the low-pressure side energy-storage units 41 in each high-pressure side energy-storage units be consistent.The technical scheme that the formation of DC transfer circuit and operation principle can provide with reference to above-described embodiment repeats no more herein.
Concrete, the low-pressure side of each DC converting unit 1 all is connected with a low-pressure side energy-storage units 41, each low-pressure side energy-storage units 41 is connected to AFE (analog front end) 5 again, so that AFE (analog front end) 5 detects charging and discharging state, magnitude of voltage and the temperature information of each low-pressure side energy-storage units 41 in real time, and convert digital signal to and send battery management controller 7 to.The high-pressure side parallel connection of each DC converting unit 1, and be connected to the both positive and negative polarity of high-pressure side energy-storage units 4, and be connected to AFE (analog front end) 5 through current detecting unit 2, so that AFE (analog front end) 5 detects the states of high-pressure side energy-storage units 4 in real time.Above-mentioned AFE (analog front end) 5 can adopt special chips such as LTC6801 or 6804, also can adopt linear optical coupling and multipath A/D converter to realize.
The pulse signal that the received pulse maker 32 of switching device driver module 6 sends drives high side switch device 11 and low-side switch device 12 is realized break-make, can adopt application-specific integrated circuit (ASIC) realizations such as LM5110.
Battery management system can adopt a feedback control unit 3, time-sharing multiplex, and the MOSFET that drives in the different DC converting unit 1 in the different time realizes break-make, thereby has realized the charge and discharge process of each low-pressure side energy-storage units 41 is controlled.
Behind the voltage and temperature information that battery management controller 7 reception AFE (analog front end) 5 collect, through some row carrying capacity and state algorithm, calculate the maximum or minimum low-pressure side energy-storage units 41 of the quantity of electric charge, send order to feedback control unit 3 by internal communication bus, the charge and discharge process of low-pressure side energy-storage units 41 is controlled.And battery management controller 7 can also pass through controller local area network, and (Controller Area Network, CAN) module, the information that battery management system is collected and current system mode are uploaded to through the CAN bus that host computer is stored and record.
The battery management system that the embodiment of the invention provides, adopt current detecting unit to detect the electric current of DC converting unit inlet highway, jointly the state of energy-storage units is detected with AFE (analog front end), realize break-make by the switching device that battery management controller and feedback control unit are controlled in each DC converting unit, make that can carry out level and smooth energy between high-pressure side energy-storage units and the low-pressure side energy-storage units shifts, so that the charging/discharging voltage of each the low-pressure side energy-storage units in each battery management system is consistent, improved precision and the accuracy of electric quantity balancing between each energy storage device.
It should be noted that at last: above each embodiment is not intended to limit only in order to technical scheme of the present invention to be described; Although the present invention has been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps some or all of technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a DC transfer circuit is characterized in that, comprising: DC converting unit, current detecting unit and feedback control unit;
The high-pressure side of described DC converting unit is used for being connected with the high-pressure side energy-storage units, and the low-pressure side of described DC converting unit is used for being connected with the low-pressure side energy-storage units;
Described current detecting unit is for detection of the electric current of described DC converting unit inlet highway and offer described feedback control unit;
Described feedback control unit is used for carrying out DC converting according to the described DC converting of the Current Control unit of described DC converting unit inlet highway.
2. DC transfer circuit according to claim 1, it is characterized in that described DC converting unit comprises: the low-side switch device of the high side switch device of built-in fly-wheel diode, built-in fly-wheel diode, high-pressure side inductance, low-pressure side inductance, first isolation capacitance and second isolation capacitance;
The positive pole of described first isolation capacitance is connected with the input of described high side switch device, and negative pole is connected with the output of described low-side switch device;
The negative pole of described second isolation capacitance is connected with the output of described high side switch device, and the input of anodal and described low-side switch device is connected;
Described high-pressure side inductance is serially connected on the on high-tension side inlet highway in described DC converting unit, and described low-pressure side inductance is serially connected on the inlet highway of described DC converting unit low-pressure side.
3. DC transfer circuit according to claim 2 is characterized in that, the quantity of described high-pressure side inductance is two, and serial connection is to the inlet highway of the inlet highway of high-pressure side, described DC converting unit positive pole and negative pole respectively;
The quantity of described low-pressure side inductance is two, and serial connection is to the inlet highway of the inlet highway of described DC converting unit low-pressure side positive pole and negative pole respectively.
4. DC transfer circuit according to claim 3 is characterized in that, described DC converting unit also comprises: high-pressure side filter capacitor and low-pressure side filter capacitor;
The positive pole of described high-pressure side filter capacitor is connected with the inlet highway of the high-pressure side positive pole of described DC converting unit, and negative pole is connected with the inlet highway of the high-pressure side negative pole of described DC converting unit;
The positive pole of described low-pressure side filter capacitor is connected with the inlet highway of the low-pressure side positive pole of described DC converting unit, and negative pole is connected with the inlet highway of the low-pressure side negative pole of described DC converting unit.
5. DC transfer circuit according to claim 4 is characterized in that, described feedback control unit comprises: current control module and impulse generator;
Described current control module is used for the described impulse generator production burst of the Current Control signal according to described DC converting unit inlet highway.
6. DC transfer circuit according to claim 5 is characterized in that, described current control module comprises adder, current compensation module and state of a control machine;
An input of described adder is connected with described current detecting unit, and another input of described adder is connected with described state of a control machine, and the output of described adder is connected with an input of described current compensation module;
Another input of described current compensation module is connected with described state of a control machine, and the output of described current compensation module is connected with described impulse generator.
7. DC transfer circuit according to claim 6 is characterized in that, described current control module also comprises the passage diverter switch;
The input of described passage diverter switch is connected with described current detecting unit, and the output of described passage diverter switch is connected with the input of described adder, and the control end of described passage diverter switch is connected with described state of a control machine.
8. according to the arbitrary described DC transfer circuit of claim 1-7, it is characterized in that described high side switch device or low-side switch device are the metal oxide layer semiconductor field-effect transistor.
9. a battery management system is characterized in that, comprises arbitrary described DC transfer circuit as claim 1-8;
Also comprise: AFE (analog front end), switching device driver module and battery management controller;
Described AFE (analog front end) is connected with the battery management controller with described low-pressure side energy-storage units respectively, is used for the state of the described low-pressure side energy-storage units of monitoring, and the status monitoring result is offered described battery management controller;
The input of described switching device driver module is connected with described impulse generator, and the output of described switching device driver module is connected with the control end of described high side switch device and the control end of low-side switch device respectively;
Described battery management controller and described state of a control machine communicate to connect.
10. battery management system according to claim 9 is characterized in that, the quantity of described DC converting unit is a plurality of;
A plurality of described low-pressure side energy-storage units are formed described high-pressure side energy-storage units.
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| CN201310066660.5A CN103208919B (en) | 2013-03-01 | 2013-03-01 | Direct current converting circuit and battery managing system |
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| CN201310066660.5A CN103208919B (en) | 2013-03-01 | 2013-03-01 | Direct current converting circuit and battery managing system |
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| CN101533072A (en) * | 2009-04-23 | 2009-09-16 | 哈尔滨工业大学 | Intelligent battery current detection circuit of dual integrator based on flow work timing |
| CN101577993A (en) * | 2009-05-14 | 2009-11-11 | 复旦大学 | Solar energy LED drive control circuit for multiplexing DC/DC converter |
| JP2010535011A (en) * | 2007-07-27 | 2010-11-11 | アメリカン パワー コンバージョン コーポレイション | Solar power device |
| CN102931849A (en) * | 2012-11-26 | 2013-02-13 | 宁德时代新能源科技有限公司 | Bidirectional DC (direct current)/DC conversion device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040257048A1 (en) * | 2003-06-17 | 2004-12-23 | Dell Products L.P. | Smart vrm to extend the battery life |
| JP2010535011A (en) * | 2007-07-27 | 2010-11-11 | アメリカン パワー コンバージョン コーポレイション | Solar power device |
| CN101533072A (en) * | 2009-04-23 | 2009-09-16 | 哈尔滨工业大学 | Intelligent battery current detection circuit of dual integrator based on flow work timing |
| CN101577993A (en) * | 2009-05-14 | 2009-11-11 | 复旦大学 | Solar energy LED drive control circuit for multiplexing DC/DC converter |
| CN102931849A (en) * | 2012-11-26 | 2013-02-13 | 宁德时代新能源科技有限公司 | Bidirectional DC (direct current)/DC conversion device |
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