CN105811502B - A kind of modified lithium battery group management circuit based on OZ8952 chip - Google Patents
A kind of modified lithium battery group management circuit based on OZ8952 chip Download PDFInfo
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- 238000001514 detection method Methods 0.000 claims abstract description 32
- 239000003990 capacitor Substances 0.000 claims description 50
- 239000004065 semiconductor Substances 0.000 claims description 40
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- 102100024690 Spliceosome RNA helicase DDX39B Human genes 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 102100024016 G patch domain and ankyrin repeat-containing protein 1 Human genes 0.000 claims description 4
- 101000904261 Homo sapiens G patch domain and ankyrin repeat-containing protein 1 Proteins 0.000 claims description 4
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- 101100100146 Candida albicans NTC1 gene Proteins 0.000 description 2
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- 239000000654 additive Substances 0.000 description 1
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- 230000015556 catabolic process Effects 0.000 description 1
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- 239000008358 core component Substances 0.000 description 1
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Abstract
The invention discloses the modified lithium battery groups based on OZ8952 chip to manage circuit, including OZ8952 chip, discharge switch, lithium battery group, switch locking module.Lithium battery group is in series by lithium battery B1, B2, B3.The DSG pin of OZ8952 chip provides signal by divider resistance for discharge switch.The second port of discharge switch connects the cathode of lithium battery B3 for the cathode port of the circuit, third port.The voltage for switching the first port detection cathode port of locking module switchs the first port of the second port connection discharge switch of locking module, switchs the third port ground connection of locking module；Under under-voltage condition, the level for switching the first port of locking module is raised, and the second port and third port for switching locking module are conducted, the first port ground connection of discharge switch.Under under-voltage condition, switch locking module ensures that discharge switch disconnects, and avoid causes lithium battery to continue electric discharge extremely because of chip interior logic is damaged.
Description
Technical field
The present invention relates to lithium battery group management field of circuit technology more particularly to a kind of modifieds based on OZ8952 chip
Lithium battery group manages circuit.
Background technique
It is well known that OZ8952 chip is a electric tool of concave-convex scientific and technological (O2Micro) Co., Ltd development & production
3~4 series lithium battery group of class protects chip, is usually used in lithium battery group management circuit and carries out additives for overcharge protection (4250 to lithium battery group
± 25mv), over (2700 ± 80mv), discharge over-current protection (level-one overcurrent, second level overcurrent), discharge load short circuit
Protection, charge and discharge high temperature protection etc..As shown in Figure 1, being the structure chart of OZ8952 chip.
Theoretically, when lithium battery group battery core voltage is lower than 2.7*3=8.1V, OZ8952 chip is judged as under-voltage shape
The DSG pin of state, OZ8952 chip exports VSS voltage, turns off the electric discharge metal-oxide-semiconductor switch on battery set management circuit；OZ8952
The VM pin of chip detects that P- current potential is got higher, and is locked and closed the driving pin DSG of the electric discharge metal-oxide-semiconductor switch of OZ8952 chip,
Play the role of protecting battery core.
However, in actual use, lithium battery group battery core voltage is in end, and when there is 20A electric discharge, the voltage meeting of battery core
It is pulled to 3.6V, the supply voltage of OZ8952 chip is 3.6V.At this point, the internal logic of OZ8952 chip is abnormal, DSG pin
Output voltage is 3.6V, and guiding discharge metal-oxide-semiconductor switch is closed primary rear and normally opened, and the VM pin of OZ8952 chip loads inspection
Surveying port will be unable to work normally, so as to cause lithium battery group continues electric discharge and damages battery core.
Summary of the invention
In view of the deficiencies of the prior art, the modified lithium battery group management based on OZ8952 chip that the invention proposes a kind of
Circuit, the lithium battery group manage circuit in the case where lithium battery group is in under-voltage condition, can ensure that electric discharge is opened by switching locking module
Shutdown is opened, to avoid being damaged because generation logic in the inside IC causes lithium battery group to continue electric discharge extremely.
To achieve the goals above, technical solution of the present invention is as follows:
A kind of modified lithium battery group management circuit based on OZ8952 chip, including OZ8952 chip, discharge switch, electricity
Press monitoring module, current detection module, chip power supply module, lithium battery group.It further include switch locking module.Lithium battery group is by lithium
Battery B1, B2, B3 are followed in series to form, the positive port (PACK of the just extremely described lithium battery group management circuit of lithium battery B1
+)；The BAT1 pin of OZ8952 chip passes through the anode of voltage detection resistances R1 connection lithium battery B1, the BAT2 of OZ8952 chip
Pin passes through the anode of voltage detection resistances R2 connection lithium battery B1, and the BAT3 pin of OZ8952 chip passes through voltage detection resistances
The BAT4 pin of the anode of R3 connection lithium battery B2, OZ8952 chip is passing through voltage detection resistances R4 connection lithium battery B3 just
Pole.
The anode of lithium battery B1 is powered by the VCC pin that chip power supply module is OZ8952 chip；OZ8952 chip
DSG pin provides control signal by divider resistance R16 for the first port of discharge switch, and the second port of discharge switch is institute
The cathode port (PACK-) of management circuit is stated, the third port of discharge switch is by current detection module connection lithium battery B3's
Cathode；The third port of current detection module is connected with the ISEN pin of OZ8952 chip；Voltage monitoring module connects
Between the VM pin of OZ8952 chip and the cathode port (PACK-) for managing circuit.Switch the first port detection of locking module
The size of the voltage of cathode port (PACK-) switchs the first port of the second port connection discharge switch of locking module, switch
The third port of locking module is grounded；In the case where lithium battery group is in under-voltage condition, the level of the first port of locking module is switched
It is raised, the second port and third port for switching locking module are conducted, so that the first port of discharge switch is grounded.
Further, lithium battery group management circuit further includes charge control module.The first port of charge control module
For the positive charged terminal mouth of lithium battery group, the anode of the second port connection lithium battery B1 of charge control module, charge control mould
The CHG pin of the third port connection OZ8952 chip of block；The common node of current detection module and discharge switch is lithium battery
The cathode charging port of group.The first port of the 4th port connection discharge switch of charge control module.It charges in lithium battery group
In the state of, the current potential of the 4th port of charge control module is pulled low, so that discharge switch be made to be in an off state.
Further, lithium battery group management circuit further includes battery regulating filtering module.The battery voltage regulation filtering mould
Block is separately connected the positive port (PACK+) of the lithium battery group management circuit, cathode port (PACK-)；The battery pressure stabilizing
Filter module is used to keep the input of lithium battery group or output voltage to keep stablizing.
Further, switch locking module includes NPN type triode Q7, resistance R27, R28, R31, capacitor C19.Triode
The base stage of Q7, resistance R28, R31 are sequentially connected, the first port of the collector connection discharge switch of triode Q7, triode Q7
Emitter ground connection.Resistance R27, capacitor C19 are connected in parallel on respectively between the base stage and emitter of triode Q7.Resistance R28, R31
Play bias；Resistance R27 is for dividing；Capacitor C19 is for filtering.
Further, battery regulating filtering module includes capacitor C1, C4, diode D1.Capacitor C1, capacitor C4, diode
D1 is separately connected the positive port (PACK+) of the lithium battery group management circuit, cathode port (PACK-).The sun of diode D1
Pole connects the cathode port (PACK-) of the lithium battery group management circuit, and the cathode of diode D1 connects the lithium battery group pipe
Manage the positive port (PACK+) of circuit.
Further, chip power supply module includes resistance R32, diode D2, capacitor C6, C8, C9, voltage-stabiliser tube ZD1.Resistance
R1 mono- terminates the anode of lithium battery B1, and the other end passes through the 16th pin VCC of diode D2 connection OZ8952 chip.Capacitor
One end of C6, C8, C9 are connected with the 16th pin VCC of OZ8952 chip respectively, and the other end is grounded respectively.Voltage-stabiliser tube ZD1
One end ground connection, the other end is connected with the 16th pin VCC of OZ8952 chip.Resistance R32 is used for current limliting；Diode D2 is used
In the one-way conduction of control electric current；Capacitor C6, C8, C9 are used for pressure stabilizing or filtering；Voltage-stabiliser tube ZD1 is for preventing OZ8952 chip
Operating voltage is excessive.
Further, charge control module includes direct-current charge port DCIN, resistance R26, diode D5, resistance R23, resistance
R19, capacitor C16, PNP type triode Q6, resistance R25, diode D4, metal-oxide-semiconductor Q4, capacitor C10, resistance R9, NPN type triode
Q1, resistance R10, resistance R17, voltage-stabiliser tube ZD2, NPN type triode Q5, resistance R20, resistance R22, voltage-stabiliser tube ZD3.Diode D5
Anode connection direct-current charge port DCIN first port, cathode connect lithium battery B1 anode；Resistance R26 is connected to direct current and fills
Between the second port of power port DCIN and the anode of diode D5.The yin of the emitter connection diode D5 of PNP type triode Q6
Pole, base stage pass through the CHG pin of resistance R19 connection OZ8952 chip, and collector successively passes through resistance R25, diode D4 connection
The grid of metal-oxide-semiconductor Q4；Resistance R23 is connected in parallel between the emitter and base stage of PNP type triode Q6；The CHG of OZ8952 chip draws
Foot is grounded by capacitor C16.The common node of drain electrode the connection current detection module and discharge switch of metal-oxide-semiconductor Q4, source electrode is lithium
The cathode charging port of battery pack；Capacitor C10 is connected in parallel between the source electrode and drain electrode of metal-oxide-semiconductor Q4；Resistor coupled in parallel is metal-oxide-semiconductor Q4's
Between source electrode and grid.The collector of NPN type triode Q1 passes through the drain electrode of resistance R10 connection metal-oxide-semiconductor Q4, and base stage passes through resistance
The drain electrode of R17, voltage-stabiliser tube ZD2 connection metal-oxide-semiconductor Q4, emitter connect the source electrode of metal-oxide-semiconductor Q4.The collector of NPN type triode Q5
By the anode of resistance R20 connection lithium battery B3, base stage passes through the drain electrode of resistance R22, voltage-stabiliser tube ZD3 connection metal-oxide-semiconductor Q4, transmitting
The source electrode of pole connection metal-oxide-semiconductor Q4.
Beneficial effects of the present invention:
(1) lithium battery group manages circuit under under-voltage condition, can ensure that discharge switch is disconnected by switching locking module,
To be damaged due to avoiding and logic occurs inside IC, lithium battery group is caused to continue electric discharge extremely.(2) lithium battery group manages circuit
In lithium battery group charging, charge control module can disconnect discharge switch automatically, so that avoiding lithium battery group is outer in charging
Section load power supply, increases the service life of lithium battery group.
Detailed description of the invention
Fig. 1 is the structure chart of OZ8952 chip.
Fig. 2 is structural block diagram of the invention.
Fig. 3 is circuit theory schematic diagram of the invention.
Wherein, the appended drawing reference of FIG. 1 to FIG. 2 are as follows: OZ8952 chip 1, charge control module 3, is put at switch locking module 2
Electric switch 4, voltage monitoring module 5, current detection module 6, battery regulating filtering module 7, chip power supply module 8, lithium battery group
9。
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is further explained.
As shown in Fig. 2, the present embodiment manages circuit based on the modified lithium battery group of OZ8952 chip.
The lock function of discharge switch 4 is expressed for clarity, and the part major function mould of the present embodiment is only shown in Fig. 2
Block, and the main pin in part that illustrates only OZ8952 chip 1 and its connection (in order to enable simple in circuits, are shown in Fig. 2
Practical OZ8952 chip 1 in 1 pin position of OZ8952 chip and Fig. 1, Fig. 3 difference).
It include OZ8952 chip 1, charge control module 3, discharge switch 4, voltage monitoring module 5, current detecting mould in Fig. 2
Block 6, battery regulating filtering module 7, chip power supply module 8, lithium battery group 9 further include switch locking module 2.Lithium battery group 9 by
Lithium battery B1, B2, B3 are sequentially connected in series, lithium battery B1 just extremely the lithium battery group management circuit positive port
(PACK+)。
Charge control module 3 is used to control the charging of lithium battery group 9；Discharge switch 4 is for controlling putting for lithium battery group 9
Electricity；Current detection module 6 is used to detect the size of 9 the input or output current of lithium battery group；Battery regulating filtering module 7 is for making
The voltage of lithium battery group 9 keeps stablizing；Voltage needed for chip power supply module 8 is used to provide work for OZ8952 chip 1；
OZ8952 chip 1 is for data acquisition or sending control instruction etc., for the core component of the battery set management circuit.
The anode of lithium battery B1 is powered by the VCC pin that chip power supply module 8 is OZ8952 chip 1；OZ8952 chip 1
DSG pin for the first port of discharge switch 4 provide control signal, the second port of discharge switch 4 by divider resistance R16
Third port for the cathode port (PACK-) of the management circuit, discharge switch 4 connects lithium electricity by current detection module 6
The cathode of pond B3；The third port of current detection module 6 is connected with the ISEN pin of OZ8952 chip 1.Voltage monitoring module 5
It connects between the VM pin of OZ8952 chip 1 and the cathode port (PACK-) of management circuit.Battery regulating filtering module 7 is distinguished
Connect positive port (PACK+), cathode port (PACK-) of the lithium battery group management circuit.
The size for switching the voltage of first port detection cathode port (PACK-) of locking module 2, switchs locking module
The first port of 2 second port connection discharge switch 4, the third port ground connection of switch locking module 2；In lithium battery group
9 under under-voltage condition, and the level for switching the first port of locking module 2 is raised, and switchs the second end of locking module 2
Mouth is conducted with third port, so that the first port of discharge switch 4 is grounded.
The first port of charge control module 3 is the positive charged terminal mouth (C+) of lithium battery group 9, charge control module 3
Second port connects the anode of lithium battery B1, the CHG pin of the third port connection OZ8952 chip 1 of charge control module 3.Electricity
The common node for flowing detection module 6 and discharge switch 4 is the cathode charging port (C-) of lithium battery group 9.Charge control module 3
The first port of 4th port connection discharge switch 4；In the state that lithium battery group 9 charges, the 4th end of charge control module 3
The current potential of mouth is pulled low, so that discharge switch 4 be made to be in an off state.
In addition, the BAT1 pin of OZ8952 chip 1 passes through the anode of voltage detection resistances R1 connection lithium battery B1, OZ8952
The BAT2 pin of chip 1 passes through the anode of voltage detection resistances R2 connection lithium battery B1, and the BAT3 pin of OZ8952 chip 1 passes through
The BAT4 pin of the anode of voltage detection resistances R3 connection lithium battery B2, OZ8952 chip 1 passes through voltage detection resistances R4 connection
The anode of lithium battery B3.
In the state that lithium battery group 9 is that external loading is powered, when OZ8952 chip 1 detects the battery core of lithium battery group 9
When power supply is in under-voltage condition (lower than 2.7V*3=8.1V), the DSG pin voltage of OZ8952 chip 1 becomes low electricity from high level
It is flat, go off discharge switch 44 by closure.At this point, the voltage of cathode port (PACK-) is drawn high by external loading, OZ8952
It, will after the VM pin of chip 1 detects that the voltage of cathode port (PACK-) becomes high level by voltage monitoring module 55
The DSG pin of OZ8952 chip 1 is locked as low level, so that discharge switch 4 remains off.
But it is in end in the battery core voltage of lithium battery group 9, when there is 20A electric discharge, the voltage of battery core can be pulled to 3.6V,
The supply voltage of IC is 3.6V, and internal logic is abnormal at this time for OZ8952 chip 1, and DSG pin can export 3.6V high level.
In this lithium battery management circuit, when discharge switch 4 is disconnected and being disconnected for the first time, switch locking module 2 detects negative
The current potential of extreme mouth (PACK-) is supported draw high after, the internal switch conducting of switch locking module 2, so that the of discharge switch 4
Single port ground connection.In this way, even if the DSG pin of IC because chip is abnormal export 3.6V voltage in the case where, discharge switch 4
First port also remains 0V voltage.To which under under-voltage condition, switch locking module 2 locks the disconnected of discharge switch 4 always
Open state avoids lithium battery group 9 from continuing to discharge and damage.
As shown in figure 3, being physical circuit schematic diagram of the invention.
Switching locking module 2 includes NPN type triode Q7, resistance R27, R28, R31, capacitor C19.The base of triode Q7
Pole, resistance R28, R31 are sequentially connected, and collector connects the common node of discharge switch 4 and divider resistance R16, emitter ground connection；
Resistance R27, capacitor C19 are connected in parallel on respectively between the base stage and emitter of triode Q7.Resistance R28, R31 play bias, electricity
Resistance R27 is for dividing, and capacitor C19 is for filtering.
Charge control module 3 includes direct-current charge port DCIN, resistance R26, diode D5, resistance R23, resistance R19, capacitor
C16, PNP type triode Q6, resistance R25, diode D4, metal-oxide-semiconductor Q4, capacitor C10, resistance R9, NPN type triode Q1, resistance
R10, resistance R17, voltage-stabiliser tube ZD2, NPN type triode Q5, resistance R20, resistance R22, voltage-stabiliser tube ZD3.The anode of pole pipe D5 connects
The first port of direct-current charge port DCIN is connect, cathode connects the anode of lithium battery B1；Resistance R26 is connected to direct-current charge port DCIN
Second port and diode D5 anode between.The cathode of the emitter connection diode D5 of PNP type triode Q6, base stage warp
Cross the CHG pin of resistance R19 connection OZ8952 chip 1, collector successively passes through resistance R25, diode D4 connection metal-oxide-semiconductor Q4
Grid；Resistance R23 is connected in parallel between the emitter and base stage of PNP type triode Q6；The CHG pin of OZ8952 chip 1 is by electricity
Hold C16 ground connection.The common node of drain electrode the connection current detection module 6 and discharge switch 4 of metal-oxide-semiconductor Q4, source electrode is lithium battery group 9
Cathode charging port；Capacitor C10 is connected in parallel between the source electrode and drain electrode of metal-oxide-semiconductor Q4；Resistor coupled in parallel metal-oxide-semiconductor Q4 source electrode with
Between grid.The collector of NPN type triode Q1 pass through resistance R10 connection metal-oxide-semiconductor Q4 drain electrode, base stage by resistance R17, surely
The drain electrode of pressure pipe ZD2 connection metal-oxide-semiconductor Q4, emitter connect the source electrode of metal-oxide-semiconductor Q4.The collector of NPN type triode Q5 is by electricity
The anode of R20 connection lithium battery B3 is hindered, base stage passes through the drain electrode of resistance R22, voltage-stabiliser tube ZD3 connection metal-oxide-semiconductor Q4, emitter connection
The source electrode of metal-oxide-semiconductor Q4.
Discharge switch 4 includes NMOS tube Q2, Q3, R18, capacitor C17.NMOS tube Q2 is identical as NMOS tube Q3 effect, the two
It is in parallel.NMOS tube Q2 grid is connected with divider resistance R16；Capacitor C17 is connected in parallel between the source electrode and drain electrode of NMOS tube Q2,
Capacitor C17 is used to eliminate the spike of NMOS tube Q2 and Q3.Resistance R18 is connected in parallel between the source electrode and grid of NMOS tube Q2,
Resistance R18 is for dividing.
Voltage monitoring module 5 includes diode D3, resistance R24, R21, capacitor C18.The anode of diode D3 connects in cathode
On port (PACK-), the cathode of diode D3 is connected by resistance R24 with the second pin VM of OZ8952 chip 1, OZ8952
The second pin VM of chip 1 is grounded through resistance R21, and capacitor C18 is in parallel with resistance R21.
Current detection module 6 includes resistance R11, R12, R13, R14, R15, C13.Resistance R12, R13, R14 are parallel with one another.
The input terminal of resistance R12 is connected with discharge switch 4, the output end ground connection of resistance R12.4th pin of OZ8952 chip 1
ISEN is grounded through resistance R11, and capacitor C13 and resistance R11 are parallel with one another.4th pin ISEN of OZ8952 chip 1 is through resistance R15
Connect the input terminal of resistance R12.
Battery regulating filtering module 7 includes capacitor C1, capacitor C4, diode D1.Capacitor C1, capacitor C4, diode D1 point
Positive port (PACK+), cathode port (PACK-) of the lithium battery group management circuit are not connected.The anode of diode D1 connects
The cathode port (PACK-) of the lithium battery group management circuit is connect, the cathode of diode D1 connects the lithium battery group management electricity
The positive port (PACK+) on road.Capacitor C1, capacitor C4 are respectively used to pressure stabilizing and filtering.
Chip power supply module 8 includes resistance R32, diode D2, capacitor C6, C8, C9, voltage-stabiliser tube ZD1.Resistance R1 mono- is terminated
The anode of lithium battery B1, the other end pass through the 16th pin VCC of diode D2 connection OZ8952 chip 1；Capacitor C6, C8, C9
One end be connected respectively with the 16th pin VCC of OZ8952 chip 1, the other end of capacitor C6, C8, C9 are grounded respectively；Surely
One end ground connection of pressure pipe ZD1, the other end are connected with the 16th pin VCC of OZ8952 chip 1.Resistance R32 be used for current limliting, two
Pole pipe D2 is used to control the one-way conduction of electric current, and capacitor C6, C8, C9 are used for pressure stabilizing or filtering, and voltage-stabiliser tube ZD1 is for preventing
The operating voltage of OZ8952 chip 1 is excessive.
In addition, the UVT5 pin of OZ8952 chip 1 is through capacity earth；OVT pin is through capacity earth；VSS pin directly connects
Ground；TS pin is grounded through swept resistance NTC1, and dynamic resistance NTC1 is in parallel with capacitor C12；PF/OVI pin is grounded through resistance R8,
And resistance R8 is in parallel with capacitor C11；EXCT pin is grounded through resistance R7；SEL pin is grounded through resistance R6.It is described herein
1 pin connection type of OZ8952 chip belongs to the prior art, is not repeated.In addition, preferably, the BAT1 of OZ8952 chip 1,
BAT2, BAT3, BAT4 pin meet filter capacitor C7, C5, C3, a C2 respectively.
The working principle of the circuit: the DSG pin of OZ8952 chip 1 has passed through divider resistance R16, R18 of partial pressure effect
To control NMOS tube Q2, Q3.When third pin DSG exports high level, NMOS tube Q2, Q3 closure, lithium battery group 9 is external loading
Power supply.When OZ8952 chip 1 detects that the battery core power supply of lithium battery group 9 is in under-voltage condition (lower than 2.7V*3=8.1V),
Third pin DSG output low level disconnects NMOS tube Q2, Q3, terminates 9 pairs of lithium battery group loads and continues to power.At this point, cathode
The current potential of port (PACK-), which is supported, to be drawn high, and the base stage of triode Q7 is raised, triode Q7 conducting, so that NMOS tube Q2, Q3
Grounded-grid, in this way, the third pin DSG of IC because chip interior is abnormal export 3.6V voltage in the case where, NMOS tube
The grid of Q2, Q3 still remain 0V voltage, so that NMOS tube Q2, Q3 be kept to disconnect always, avoid lithium battery group 9 because of type discharge
Electricity and damage.
When the BAT1 pin of OZ8952 chip 1 detect lithium battery group 9 voltage be higher than chip interior threshold voltage, and
When direct-current charge port DCIN accesses power supply, CHG pin will be pulled to 0V, and triode Q6 conducting, metal-oxide-semiconductor Q4 is because of grid potential quilt
It draws high and is connected, external power supply is the charging of lithium battery group 9 at this time, and metal-oxide-semiconductor Q4 is the charge switch of lithium battery group 9.DC charging
When mouth DCIN access power supply, the grid potential of metal-oxide-semiconductor Q8 is raised, metal-oxide-semiconductor Q8 conducting, so that the grid of metal-oxide-semiconductor Q2, Q3 connect
Ground, metal-oxide-semiconductor Q2, Q3 are disconnected, so that avoiding lithium battery group 9 is load supplying in charging.
Critical value (the VTH- of the voltage needed for the voltage of battery pack controls charge control module 3 lower than OZ8952 chip 1
When HVNMOS), chip be can not work normally, and the 0V at this moment just needing voltage-stabiliser tube ZD2, resistance R17, R10, triode Q1 to constitute fills
Electric line is that battery is pre-charged.Specific implementation process are as follows: when the voltage of battery pack is lower than VTH-HVNMOS, connection charging
Device.When the input voltage of charger is than battery pack 9, voltage-stabiliser tube ZD2 voltage and is higher than 1V or more, voltage-stabiliser tube ZD2 can reversely be hit
It wears, triode Q1 conducting, such charging current can be directly over resistance R10, triode Q1, metal-oxide-semiconductor Q4 and charge for battery pack,
Resistance R10 is used for current limliting.When 9 voltage of battery pack is greater than 4.5V, OZ8952 chip 1 is worked normally, and metal-oxide-semiconductor Q4 is disconnected, the 0V
Charging circuit stops working.
In addition, when the voltage of any one section lithium battery of battery pack 9 is above under-voltage recovery set by OZ8952 chip 1
Limit value (VUVP) -01.V, and when the duration is more than the time set in advance, which will no longer be under-voltage shape
State, OZ8952 chip will enter SHUTDOWN mode.If need to reply as normal mode of operation, need to meet following two points: a.
Chip detects that charger is inserted into；B. and each economize on electricity cell voltage is above VUVP-01.V.OZ8952 chip 1 detects charging
The condition of device insertion is that the voltage of CHG pin is higher than the voltage of lithium battery BAT3, at this moment just needs to increase active circuit.Such as figure
In 3, voltage-stabiliser tube ZD3, resistance R22, R20 constitute PowerDown active circuit of the invention, and working principle is: OZ8952 chip 1
Into after SHUTDOWN mode, insertion charger charging, when Vcharger (charging voltage) > Vpack (battery pack)+VZD3 is (steady
Pressure pipe ZD3 voltage)+1V when, voltage-stabiliser tube ZD3 reverse breakdown, triode Q5 conducting, the voltage of lithium battery BAT3 is pulled low, in this way
The voltage of CHG pin can be made to be greater than the voltage of lithium battery BAT3, OZ8952 chip 1 will be activated from SHUTDOWN mode.
In view of component error, difference between battery, systematic influence, so the value of each device is had to by actual experiment
Verifying.
What has been described above is only a preferred embodiment of the present invention, and present invention is not limited to the above embodiments.It is appreciated that this
Other improvements and changes that field technical staff directly exports or associates without departing from the basic idea of the present invention
It is considered as being included within protection scope of the present invention.
Claims (5)
1. a kind of modified lithium battery group based on OZ8952 chip manages circuit, including OZ8952 chip (1), discharge switch
(4), voltage monitoring module (5), current detection module (6), chip power supply module (8), lithium battery group (9)；Lithium battery group (9) by
Lithium battery B1, B2, B3 are followed in series to form, the positive port of the just extremely described lithium battery group management circuit of lithium battery B1
(PACK+)；The BAT1 pin of OZ8952 chip (1) passes through the anode of voltage detection resistances R1 connection lithium battery B1, OZ8952 core
The BAT2 pin of piece (1) passes through the anode of voltage detection resistances R2 connection lithium battery B1, the BAT3 pin warp of OZ8952 chip (1)
The BAT4 pin of the anode of Zenith tracking resistance R3 connection lithium battery B2, OZ8952 chip (1) passes through voltage detection resistances R4
Connect the anode of lithium battery B3；It is characterized by also including switches locking module (2)；
The anode of lithium battery B1 is powered by the VCC pin that chip power supply module (8) are OZ8952 chip (1)；OZ8952 chip
(1) DSG pin provides control signal by divider resistance R16 for the first port of discharge switch (4), discharge switch (4)
Cathode port (PACK-) of the second port as lithium battery group management circuit, the third port of discharge switch (4) is by electricity
Flow the cathode of detection module (6) connection lithium battery B3；The third port of current detection module (6) and OZ8952 chip (1)
ISEN pin is connected；Voltage monitoring module (5), which connects, manages circuit in the VM pin of OZ8952 chip (1) and the lithium battery group
Cathode port (PACK-) between；
The size for switching the voltage of first port detection cathode port (PACK-) of locking module (2), switchs locking module (2)
Second port connection discharge switch (4) first port, switch locking module (2) third port ground connection；In lithium battery group
(9) under under-voltage condition, the level for switching the first port of locking module (2) is raised, and the second of switch locking module (2)
Port is conducted with third port, so that the first port of discharge switch (4) is grounded；
It further include charge control module (3)；The first port of charge control module (3) is the positive charged terminal of lithium battery group (9)
Mouthful, the anode of the second port connection lithium battery B1 of charge control module (3), the third port connection of charge control module (3)
The CHG pin of OZ8952 chip (1)；The common node of current detection module (6) and discharge switch (4) is lithium battery group (9)
Cathode charging port；The first port of the 4th port connection discharge switch (4) of charge control module (3)；In lithium battery group (9)
In the state of charging, the current potential of the 4th port of charge control module (3) is pulled low, and is disconnected so that discharge switch (4) be made to be in
State；
The charge control module (3) includes direct-current charge port DCIN, resistance R26, diode D5, resistance R23, resistance R19, electricity
Hold C16, PNP type triode Q6, resistance R25, diode D4, metal-oxide-semiconductor Q4, capacitor C10, resistance R9, NPN type triode Q1, electricity
Hinder R10, resistance R17, voltage-stabiliser tube ZD2, NPN type triode Q5, resistance R20, resistance R22, voltage-stabiliser tube ZD3；The sun of diode D5
Pole connects the first port of direct-current charge port DCIN, and cathode connects the anode of lithium battery B1；Resistance R26 is connected to direct-current charge port
Between the second port of DCIN and the anode of diode D5；The cathode of the emitter connection diode D5 of PNP type triode Q6, base
The CHG pin of resistance R19 connection OZ8952 chip (1) is passed through in pole, and collector successively passes through resistance R25, diode D4 connection MOS
The grid of pipe Q4；Resistance R23 is connected in parallel between the emitter and base stage of PNP type triode Q6；The CHG of OZ8952 chip (1) draws
Foot is grounded by capacitor C16；
The common node of drain electrode connection current detection module (6) and discharge switch (4) of metal-oxide-semiconductor Q4, source electrode is lithium battery group (9)
Cathode charging port；Capacitor C10 is connected in parallel between the source electrode and drain electrode of metal-oxide-semiconductor Q4；Resistance R9 is connected in parallel on the source electrode of metal-oxide-semiconductor Q4
Between grid；
The collector of NPN type triode Q1 passes through the drain electrode of resistance R10 connection metal-oxide-semiconductor Q4, and base stage passes through resistance R17, voltage-stabiliser tube
The drain electrode of ZD2 connection metal-oxide-semiconductor Q4, emitter connect the source electrode of metal-oxide-semiconductor Q4；The collector of NPN type triode Q5 passes through resistance R20
The anode of lithium battery B3 is connected, base stage passes through the drain electrode of resistance R22, voltage-stabiliser tube ZD3 connection metal-oxide-semiconductor Q4, and emitter connects metal-oxide-semiconductor
The source electrode of Q4.
2. the modified lithium battery group according to claim 1 based on OZ8952 chip manages circuit, it is characterised in that: also
Including battery regulating filtering module (7)；
The battery regulating filtering module (7) is separately connected the positive port (PACK+) of the lithium battery group management circuit, cathode
Port (PACK-)；The battery regulating filtering module (7) is used to keep input or the output voltage stabilization of lithium battery group (9).
3. the modified lithium battery group according to claim 1 based on OZ8952 chip manages circuit, it is characterised in that: institute
Stating switch locking module (2) includes NPN type triode Q7, resistance R27, R28, R31, capacitor C19；The base stage of triode Q7, electricity
Resistance R28, R31 are sequentially connected, the first port of collector connection discharge switch (4) of triode Q7, the emitter of triode Q7
Ground connection；Resistance R27, capacitor C19 are connected in parallel on respectively between the base stage and emitter of triode Q7；Resistance R28, R31 play biasing and make
With；Resistance R27 is for dividing；Capacitor C19 is for filtering.
4. the modified lithium battery group according to claim 2 based on OZ8952 chip manages circuit, it is characterised in that: institute
Stating battery regulating filtering module (7) includes capacitor C1, C4, diode D1；Capacitor C1, capacitor C4, diode D1 are separately connected institute
State positive port (PACK+), cathode port (PACK-) of lithium battery group management circuit；The anode of diode D1 connects the lithium
The cathode port (PACK-) of battery set management circuit, the cathode of diode D1 connect the anode of the lithium battery group management circuit
Port (PACK+).
5. the modified lithium battery group according to claim 1 based on OZ8952 chip manages circuit, it is characterised in that: institute
Stating chip power supply module (8) includes resistance R32, diode D2, capacitor C6, C8, C9, voltage-stabiliser tube ZD1；Resistance R32 mono- terminates lithium
The anode of battery B1, the other end pass through the 16th pin VCC of diode D2 connection OZ8952 chip (1)；Capacitor C6, C8, C9
One end be connected respectively with the 16th pin VCC of OZ8952 chip (1), the other end is grounded respectively；One end of voltage-stabiliser tube ZD1
Ground connection, the other end are connected with the 16th pin VCC of OZ8952 chip (1)；Resistance R32 is used for current limliting；Diode D2 is used for
Control the one-way conduction of electric current；Capacitor C6, C8, C9 are used for pressure stabilizing or filtering；Voltage-stabiliser tube ZD1 is for preventing OZ8952 chip (1)
Operating voltage it is excessive.
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| US10587130B2 (en) | 2016-11-04 | 2020-03-10 | International Business Machines Corporation | Automatically discharging a rechargeable battery |
| CN107104483A (en) * | 2017-05-17 | 2017-08-29 | 上海德朗能新能源有限公司 | A kind of charge-discharge circuit for LEV lithium battery group |
| CN108155703A (en) * | 2018-03-11 | 2018-06-12 | 深圳大力神科技有限公司 | A kind of improvement lithium cell protecting device and its charging MOS protection circuits |
| CN108988300B (en) * | 2018-06-11 | 2020-04-03 | 山东超越数控电子股份有限公司 | Self-power-off circuit structure of notebook power circuit and control method |
| CN108808780B (en) * | 2018-06-22 | 2023-10-17 | 河南华普物联科技有限公司 | Lithium battery pack battery management system for solar panel |
| CN113141034B (en) * | 2020-01-20 | 2023-02-10 | 华润微电子（重庆）有限公司 | Battery charging control circuit and battery protection system |
| CN111884323A (en) * | 2020-07-31 | 2020-11-03 | 上海裕芯电子科技有限公司 | Low-power consumption solar light-operated boost circuit |
| CN113162190B (en) * | 2021-05-10 | 2022-07-19 | 深圳市卓朗微电子有限公司 | Lithium battery pack control circuit and method based on 0Z8952 chip |
| CN115208009B (en) * | 2022-07-07 | 2024-04-30 | 深圳拓邦股份有限公司 | Battery protection circuit and electric appliance |
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| CN103647323A (en) * | 2013-12-13 | 2014-03-19 | 海能达通信股份有限公司 | Cell discharge overcurrent protection circuit and cell discharge overcurrent protection method |
| CN203859501U (en) * | 2014-04-23 | 2014-10-01 | 深圳Tcl新技术有限公司 | Battery pack discharge protection circuit and device |
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| US9007024B2 (en) * | 2008-05-28 | 2015-04-14 | American Reliance, Inc. | DC power control to maximize battery charging time |
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| CN103647323A (en) * | 2013-12-13 | 2014-03-19 | 海能达通信股份有限公司 | Cell discharge overcurrent protection circuit and cell discharge overcurrent protection method |
| CN203859501U (en) * | 2014-04-23 | 2014-10-01 | 深圳Tcl新技术有限公司 | Battery pack discharge protection circuit and device |
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