CN106849290A - A kind of battery protecting circuit and lithium battery circuit - Google Patents
A kind of battery protecting circuit and lithium battery circuit Download PDFInfo
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- CN106849290A CN106849290A CN201710257796.2A CN201710257796A CN106849290A CN 106849290 A CN106849290 A CN 106849290A CN 201710257796 A CN201710257796 A CN 201710257796A CN 106849290 A CN106849290 A CN 106849290A
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 21
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 230000004224 protection Effects 0.000 claims abstract description 94
- 230000005611 electricity Effects 0.000 claims abstract description 17
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000005516 engineering process Methods 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Protection Of Static Devices (AREA)
Abstract
A kind of battery protecting circuit and lithium battery circuit that the present invention is provided, are related to battery charging/discharging protection technique field.Wherein, battery protecting circuit includes charge/discharge circuit, controller, positive source interface, power cathode interface, anode interface and GND interface.Charge/discharge circuit includes the first power tube and the second power tube.Controller is provided with the first driving port, the second driving port, the first power port, second source port and grounding ports, and is integrated with reverse-connection protection circuit.When positive source interface is connected with power cathode, the current path that reverse-connection protection circuit is cut off the electricity supply between controller；When anode interface is connected with GND, the current path between reverse-connection protection circuit cut-out battery and controller.By above-mentioned design, solve the problems, such as in existing battery protection technology to there is reliability because being susceptible to short circuit during production and use low.
Description
Technical field
The present invention relates to battery charging/discharging protection technique field, in particular to a kind of battery protecting circuit and lithium electricity
Pond circuit.
Background technology
With continuing to develop for electronic technology, electronic product is widely applied to various occasions.Battery is used as electronic product
Power supply, be also widely used.For the service life for improving the battery security for using and extend battery, can all set specially
The battery protecting circuit of door is realizing the protection to battery.
In the prior art, battery protecting circuit typically all uses GND protection scheme.For some special applications
Close, if using GND protection scheme, short circuit problem is susceptible to during the production, use in battery, cause battery
The security for using is substantially reduced, and can also increase the packing cost expense of battery.So, with the development of battery applications technology,
Anode protection scheme is gradually commonly used.
Studied through inventor and found, although solved in GND protection scheme easily using anode protection scheme
The problem of short circuit, but equally exist GND protection scheme and exist because polarity connection is instead resulted in during the use of battery
The problem that relevant device is burned out.
The content of the invention
In view of this, it is an object of the invention to provide a kind of battery protecting circuit, to improve existing battery protection technology
It is middle to there is a problem of that reliability is low because being susceptible to short circuit during production and use, it is effectively improved battery protecting circuit
Security.
Another object of the present invention is to provide a kind of lithium battery circuit, to improve in existing battery protection technology because of production
There is a problem of that reliability is low with short circuit is susceptible to during use, be effectively improved the safety of battery protecting circuit
Property.
To achieve the above object, the embodiment of the present invention is adopted the following technical scheme that：
A kind of battery protecting circuit, including charge/discharge circuit, controller, positive source interface, power cathode interface, electricity
Pond anode interface and GND interface, the charge/discharge circuit include the first power tube and the second power tube, the control
Device is provided with the first driving port, the second driving port, the first power port, second source port and grounding ports, and
It is integrated with reverse-connection protection circuit.
The drain electrode that the source electrode of first power tube is connected with the positive source interface, drains with second power tube
Connection, grid are connected with the described first driving port, and the grid of second power tube is connected with the described second driving port, source
Pole is connected with the anode interface, the power cathode interface respectively with the GND interface and the grounding ports
Connection, first power port is connected with the positive source interface, and the second source port connects with the anode
Mouth connection, the reverse-connection protection circuit is connected between first power port and second source port.
When the positive source interface is connected with power cathode, the reverse-connection protection circuit cuts off the power supply and the control
Current path between device processed.
When the anode interface is connected with GND, the reverse-connection protection circuit cuts off the battery and the control
Current path between device processed.
The controller controls first power tube respectively by the described first driving port and the second driving port
The grid voltage of grid voltage and the second power tube, so that first power tube and the second power tube on or off are controlled,
And then control the charge/discharge circuit on or off.
In the embodiment of the present invention is preferably selected, in above-mentioned battery protecting circuit, first power tube and described
Second power tube is N-type power tube.
In the embodiment of the present invention is preferably selected, in above-mentioned battery protecting circuit, the reverse-connection protection circuit includes
First reverse-connection protection circuit, the second reverse-connection protection circuit and charging circuit.
The first end of first reverse-connection protection circuit is connected with first power port, the second end and the charging are electric
The first end connection on road, the first end of second reverse-connection protection circuit is connected with the second source port, the second end and institute
State the second end connection of charging circuit.
When the magnitude of voltage of the battery is less than preset value, first power tube and the second power tube end, the charging
Circuit turn-on, the power supply battery is charged by the reverse-connection protection circuit or.
When the magnitude of voltage of the battery is more than the preset value, first power tube and the second power tube are turned on, described
Charging circuit ends, and the power supply is charged by the charge/discharge circuit to the battery.
In the embodiment of the present invention is preferably selected, in above-mentioned battery protecting circuit, the controller is also integrated with
One drive circuit, the second drive circuit and charge pump.
One end of the charge pump is connected with the second end of second reverse-connection protection circuit, the other end is respectively with described
One drive circuit and the second drive circuit are connected, and first drive circuit is connected with the described first driving port, and described second
Drive circuit is connected with the described second driving port.
The voltage signal of the second source port drives electricity by being sent after the increase of the charge pump to described first
Road and the second drive circuit, and drive port and second to drive the grid of the first power tube described in port controlling by described first
The grid voltage of voltage and the second power tube, so that first power tube and the second power tube on or off are controlled, and then
Control the charge/discharge circuit on or off.
In the embodiment of the present invention is preferably selected, in above-mentioned battery protecting circuit, the controller is additionally provided with surely
Pressure side mouthful, voltage stabilizing port one end is connected with the charge pump, the other end passes through electric capacity of voltage regulation and the anode interface
Connection.
In the embodiment of the present invention is preferably selected, in above-mentioned battery protecting circuit, the controller is also integrated with patrols
Control circuit is collected, the logic control circuit is connected with first drive circuit and the second drive circuit respectively, and by institute
State the first driving port and second and drive the first power tube and the second power tube on or off described in port controlling.
In the embodiment of the present invention is preferably selected, in above-mentioned battery protecting circuit, the controller is also integrated with
One comparator and the second comparator, the inverting input of the first comparator pass through first resistor and second reverse connecting protection
The second end connection of circuit, the overcharge voltage protection end connection of output end and logic control circuit, normal phase input end with it is described
The inverting input connection of the second comparator, the output end of second comparator and the overdischarge electricity of the logic control circuit
The connection of pressure protection end, normal phase input end are connected and the 3rd by second resistance with the inverting input of the first comparator respectively
Resistance is connected with grounding ports.
It is described to patrol when the magnitude of voltage of the first comparator inverting input is more than the normal voltage of the first comparator
Collect control circuit controls first power tube and the second power tube to cut by first drive circuit and the second drive circuit
Only, when the magnitude of voltage of the first comparator inverting input is less than the normal voltage of the first comparator, the logic control
Circuit processed controls first power tube and the second power tube to turn on by first drive circuit and the second drive circuit.
It is described to patrol when the magnitude of voltage of the second comparator normal phase input end is less than the normal voltage of second comparator
Collect control circuit controls first power tube and the second power tube to cut by first drive circuit and the second drive circuit
Only, when the magnitude of voltage of the second comparator normal phase input end is more than the normal voltage of second comparator, the logic control
Circuit processed controls first power tube and the second power tube to turn on by first drive circuit and the second drive circuit.
In the embodiment of the present invention is preferably selected, in above-mentioned battery protecting circuit, the controller is also integrated with
Three comparators and the 4th comparator, the normal phase input end of the 3rd comparator and the second end of first reverse-connection protection circuit
Connection, the discharge over-current protection end connection of output end and logic control circuit, inverting input and the 4th comparator
Normal phase input end is connected, and the output end of the 4th comparator connects with the charge over-current protection end of the logic control circuit
Connect, inverting input is connected with the normal phase input end of the 3rd comparator.
It is described to patrol when the current value of the 3rd comparator normal phase input end is more than the normalized current of the first comparator
Collect control circuit controls first power tube and the second power tube to cut by first drive circuit and the second drive circuit
Only, when the current value of the 3rd comparator normal phase input end is less than the normalized current of the 3rd comparator, the logic control
Circuit processed controls first power tube and the second power tube to turn on by first drive circuit and the second drive circuit.
It is described to patrol when the current value of the 4th comparator inverting input is more than the normalized current of the 4th comparator
Collect control circuit controls first power tube and the second power tube to cut by first drive circuit and the second drive circuit
Only, when the current value of the 4th comparator inverting input is less than the normalized current of the 4th comparator, the logic control
Circuit processed controls first power tube and the second power tube to turn on by first drive circuit and the second drive circuit.
In the embodiment of the present invention is preferably selected, in above-mentioned battery protecting circuit, the battery protecting circuit is also wrapped
Filter circuit is included, the filter circuit is arranged between the anode interface and the second source port.
On the basis of the above, the embodiment of the present invention additionally provides a kind of lithium battery circuit, including lithium battery and the battery
Protection circuit, the positive pole of the lithium battery is connected with the anode interface, negative pole is connected with the GND interface.
The present invention provides a kind of battery protecting circuit and lithium battery circuit, by the first power port in controller and the
Integrated reverse-connection protection circuit between two power ports, solve in existing battery protection technology because during production and use easily
It is short-circuited and there is a problem of that reliability is low, is effectively improved the security of battery protecting circuit.
Further, the first power tube and the second power tube all use N-type power tube, solve in the prior art because using
P-type power tube and cause high cost, it is resistance to force down and problem that impedance is big, drastically increase the practicality of battery protecting circuit
Property.
To enable the above objects, features and advantages of the present invention to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of battery protecting circuit in the prior art using single p-type power tube.
Fig. 2 is in the prior art using two circuit theory diagrams of the battery protecting circuit of p-type power tube.
Fig. 3 is the circuit theory diagrams of battery protecting circuit provided in an embodiment of the present invention.
Fig. 4 is the circuit theory diagrams of controller provided in an embodiment of the present invention.
Fig. 5 is the circuit theory diagrams of the first reverse-connection protection circuit provided in an embodiment of the present invention.
Fig. 6 is the circuit theory diagrams of lithium battery circuit provided in an embodiment of the present invention.
Icon：10- lithium battery circuits；100- battery protecting circuits；110- charge/discharge circuits；The power tubes of M1- first；M2-
Second power tube；120- controllers；DO- first drives port；CO- second drives port；The power ports of VM- first；VDD-
Two power ports；GND- grounding ports；The reverse-connection protection circuits of 121- first；The power tubes of M3- the 3rd；The power tubes of M4- the 4th；R1-
Earth resistance；R2- divider resistances；The reverse-connection protection circuits of 122- second；123- charging circuits；The drive circuits of 124- first；125-
Second drive circuit；126- charge pumps；127- logic control circuits；A1- first comparators；The comparators of A2- second；A3- the 3rd
Comparator；The comparators of A4- the 4th；R3- first resistors；R4- second resistances；R5- 3rd resistors；OVP- overcharge voltages are protected
End；UVP- overdischarge voltage protections end；OCP- discharge over-current protection ends；OCCP- charge over-current protection ends；BST- voltage stabilizings end
Mouthful；C1- electric capacity of voltage regulation；130- positive source interfaces；140- power cathode interfaces；150- anode interfaces；160- batteries are born
Pole interface；170- filter circuits；The resistance of R6- the 4th；C2- filter capacitors；200- lithium batteries.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment only
It is a part of embodiment of the invention, rather than whole embodiments.The present invention generally described and illustrated in accompanying drawing herein
The component of embodiment can be arranged and designed with a variety of configurations.
Therefore, the detailed description of embodiments of the invention below to providing in the accompanying drawings is not intended to limit claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belongs to the model of present invention protection
Enclose.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it need not be further defined and explained in subsequent accompanying drawing.In description of the invention
In, term " first ", " second ", " the 3rd ", " the 4th " etc. are only used for distinguishing description, and it is not intended that being or implying relative
Importance.
In the description of the invention, unless otherwise clearly defined and limited, term " setting ", " connected ", " connection " is answered
It is interpreted broadly, for example, it may be being fixedly connected, or being detachably connected, or is integrally connected；Can be that machinery connects
Connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion.For the ordinary skill in the art, above-mentioned term tool in the present invention can be understood with concrete condition
Body implication.
Fig. 1 and Fig. 2 are two kinds of circuit theory diagrams of technical scheme in existing battery protecting circuit.
As shown in figure 1, the battery protecting circuit is using single p-type power tube and coordinates Bu l k circuits to fill battery
Electricity, electric discharge are controlled.Because p-type power tube is limited by encapsulation volume and process manufacturing technology, exist pressure-resistant degraded performance,
The problem that conduction impedance is larger and conveyance capacity is low, above mentioned problem will greatly reduce the battery protecting circuit security and
Reliability.
As shown in Fig. 2 the battery protecting circuit uses two p-type power tube cooperatings, although solve using single P
There is pressure-resistant degraded performance in type power tube, but still there is a problem of that conduction impedance is big.To solve the above problems, can
With by increasing the area of p-type power tube, so as to reduce its conduction impedance.Due to the increase of area, on the one hand will significantly
The manufacturing cost of the protection circuit is improved, on the other hand can also make manufacturing process increasingly complex.Above-mentioned both sides problem, will make
The practical value of the battery protecting circuit is extremely low.
As shown in figure 3, a kind of battery protecting circuit 100 is the embodiment of the invention provides, including charge/discharge circuit 110, control
Device processed 120, positive source interface 130, power cathode interface 140, anode interface 150 and GND interface 160.Institute
Stating charge/discharge circuit 110 includes the first power tube M1 and the second power tube M2, and the controller 120 is provided with the first drive end
Mouth DO, second drive port CO, the first power port VM, second source port VDD and grounding ports GND.
Further, in the present embodiment, the source electrode of the first power tube M1 connects with the positive source interface 130
Connect, drain be connected with the drain electrode of the second power tube M2, grid with described first driving port DO be connected.Second power
Port CO is connected the grid of pipe M2, source electrode is connected with the anode interface 150 with the described second driving.The power cathode
Interface 140 is connected with the GND interface 160 and the grounding ports GND respectively.The first power port VM and institute
State positive source interface 130 to connect, the second source port VDD is connected with the anode interface 150.
Further, in the present embodiment, the controller 120 is also integrated with reverse-connection protection circuit.The reverse connecting protection
It is electrically connected between the first power port VM and second source port VDD.
By above-mentioned design, it is capable of achieving：When the positive source interface 130 is connected with power cathode, the reverse connecting protection
Current path between power supply described in circuitry cuts and the controller 120, so as to realize the protection to the controller 120.
When the anode interface 150 is connected with GND, the reverse-connection protection circuit cuts off the battery and the controller
Current path between 120, so as to realize the protection to the controller 120.The controller 120 drives by described first
The drivings of port DO and second port CO controls the grid voltage of the first power tube M1 and the grid of the second power tube M2 respectively
Voltage, so as to control the first power tube M1 and the second power tube M2 on or off, and then controls the charge/discharge circuit
110 on or off, to realize the control whether power supply charges to the battery, or realize the battery to outside
The control whether circuit discharges.
Further, in the present embodiment, the first power tube M1 and the second power tube M2 is N-type power tube.
The drain electrode of the first power tube M1 and the second power tube M2 is connected, it is possible to achieve to two overall packages of power tube, have
Reduce to effect the manufacturing cost of the battery protecting circuit 100.In the prior art, p-type power tube conduct is typically all used
Switching device, but p-type power tube by encapsulation volume and technique due to being limited, exist pressure-resistant degraded performance, conduction impedance compared with
The big and low problem of conveyance capacity.To solve the above mentioned problem of p-type power tube, two p-type power tubes are typically taken to coordinate work
Make, but this just drastically increases manufacturing cost, without practical value.Using N-type power tube, than using p-type power
Pipe, is effectively improved the pressure-resistant performance of the battery protecting circuit 100.
With reference to Fig. 4, in the present embodiment, the reverse-connection protection circuit includes the first reverse-connection protection circuit 121, the second reversal connection
Protection circuit 122 and charging circuit 123.The first end of first reverse-connection protection circuit 121 and first power port
VM connections, the second end are connected with the first end of the charging circuit 123.The first end of second reverse-connection protection circuit 122 with
The second source port VDD connections, the second end are connected with the second end of the charging circuit 123.
By above-mentioned design, it is capable of achieving：When the battery magnitude of voltage be less than preset value when, the first power tube M1 and
Second power tube M2 ends, and the charging circuit 123 is turned on, and the power supply is filled by the reverse-connection protection circuit to the battery
Electricity.When the magnitude of voltage of the battery is more than the preset value, the first power tube M1 and the second power tube M2 is turned on, described
Charging circuit 123 ends, and the power supply is charged by 110 pairs of batteries of the charge/discharge circuit.
Alternatively, the size of the preset value can be it is various, it is unrestricted.In the present embodiment, the preset value is
2.3V。
Alternatively, the circuit structure of first reverse-connection protection circuit 121 and second reverse-connection protection circuit 122 can be with
It is identical, or different.In the present embodiment, first reverse-connection protection circuit 121 and second reverse connecting protection electricity
The circuit structure on road 122 is identical.
With reference to Fig. 5, in the present embodiment, first reverse-connection protection circuit 121 can include the 3rd power tube M3 and the
Four power tube M4.The 3rd power tube M3 drain electrode and the 4th power tube M4 drain electrode respectively with first power end
Mouth VM connections, the grid of the 3rd power tube M3 is connected with the grid of the 4th power tube M4 and is connect by earth resistance R1
Ground, the source electrode of the 3rd power tube M3 is connected by divider resistance R2 with the grid of the 3rd power tube M3, and the described 4th
The source electrode of power tube M4 is connected with the first end of the charging circuit 123.
When the positive source interface 130 is connected with power cathode, the drain electrode of the 3rd power tube M3 and described
The voltage of the drain electrode of four power tube M4 is pulled down to the voltage of the power cathode, the grid of the 3rd power tube M3 with it is described
The voltage of the grid of the 4th power tube M4 is pulled to the voltage of the positive source, the 3rd power tube M3 and the described 4th
Power tube M4 ends, and the electric current that first reverse-connection protection circuit 121 is cut off between the power supply and the controller 120 leads to
Road.
Alternatively, the 3rd power tube M3 can be with the model of the 4th power tube M4 it is various, it is unrestricted.
In the present embodiment, the 3rd power tube M3 and the 4th power tube M4 is p-type power tube.
Further, in the present embodiment, the controller 120 is also integrated with the first drive circuit 124, second and drives electricity
Road 125 and charge pump 126.One end of the charge pump 126 is connected with the second end of second reverse-connection protection circuit 122,
The other end is connected with the drive circuit 125 of first drive circuit 124 and second respectively, first drive circuit 124 and institute
The first driving port DO connections are stated, second drive circuit 125 is connected with the described second driving port CO.
By above-mentioned design, it is capable of achieving：The voltage signal of the second source port VDD is by the charge pump 126
Sent after increase to the drive circuit 125 of first drive circuit 124 and second, and port DO and the are driven by described first
Two drive port CO to control the grid voltage of the first power tube M1 and the grid voltage of the second power tube M2, so as to control institute
The first power tube M1 and the second power tube M2 on or off are stated, and then controls the on or off of charge/discharge circuit 110.
Further, in the present embodiment, the controller 120 is also integrated with logic control circuit 127, the logic control
Circuit processed 127 is connected with the drive circuit 125 of first drive circuit 124 and second respectively, and by first drive end
Mouth DO and second drives port CO to control the first power tube M1 and the second power tube M2 on or off.
Further, in the present embodiment, the controller 120 is also integrated with comparator, for being carried out to the battery
Overcharge/discharge voltage protection and charge/discharge overcurrent protection.
Alternatively, the quantity of the comparator can be it is various, it is unrestricted.In the present embodiment, the comparator is
Four, respectively first comparator A1, the second comparator A2, the 3rd comparator A3 and the 4th comparator A4.First ratio
It is used to coordinating the logic control circuit 127 carry out overcharge voltage protection compared with device A1, the second comparator A2 is used to coordinate
The logic control circuit 127 carries out overdischarge voltage protection, and the 3rd comparator A3 is used to coordinate the logic control electricity
Road 127 carries out charge over-current protection, and the 4th comparator A4 for coordinating the logic control circuit 127 discharged
Current protection.
The inverting input of the first comparator A1 passes through first resistor R3 and second reverse-connection protection circuit 122
The connection of second end, the overcharge voltage protection end OVP connections of output end and logic control circuit 127, normal phase input end with it is described
The inverting input connection of the second comparator A2, the output end and the logic control circuit 127 of the second comparator A2
Overdischarge voltage protection end UVP connections, normal phase input end are anti-phase with the first comparator A1 by second resistance R4 respectively
Input is connected and 3rd resistor R5 is connected with grounding ports GND.
The normal phase input end of the 3rd comparator A3 is connected with the second end of first reverse-connection protection circuit 121, defeated
Go out that end is connected with the discharge over-current protection end OCP of logic control circuit 127, inverting input is with the 4th comparator A4's
Normal phase input end is connected, and the output end of the 4th comparator A4 is protected with the charge over-current of the logic control circuit 127
End OCCP is connected, inverting input is connected with the normal phase input end of the 3rd comparator A3.
The operation principle of the first comparator A1 is：The magnitude of voltage of the first comparator A1 inverting inputs is more than institute
When stating the normal voltage of first comparator A1, the logic control circuit 127 is driven by first drive circuit 124 and second
Dynamic circuit 125 controls the first power tube M1 and the second power tube M2 to end, the first comparator A1 inverting inputs
When magnitude of voltage is less than the normal voltage of the first comparator A1, the logic control circuit 127 drives electricity by described first
The drive circuit 125 of road 124 and second controls the first power tube M1 and the second power tube M2 to turn on.
The operation principle of the second comparator A2 is：The magnitude of voltage of the second comparator A2 normal phase input ends is less than institute
When stating the normal voltage of the second comparator A2, the logic control circuit 127 is driven by first drive circuit 124 and second
Dynamic circuit 125 controls the first power tube M1 and the second power tube M2 to end, the second comparator A2 normal phase input ends
When magnitude of voltage is more than the normal voltage of the second comparator A2, the logic control circuit 127 drives electricity by described first
The drive circuit 125 of road 124 and second controls the first power tube M1 and the second power tube M2 to turn on.
The operation principle of the 3rd comparator A3 is：The current value of the 3rd comparator A3 normal phase input ends is more than institute
When stating the normalized current of first comparator A1, the logic control circuit 127 is driven by first drive circuit 124 and second
Dynamic circuit 125 controls the first power tube M1 and the second power tube M2 to end, the 3rd comparator A3 normal phase input ends
When current value is less than the normalized current of the 3rd comparator A3, the logic control circuit 127 drives electricity by described first
The drive circuit 125 of road 124 and second controls the first power tube M1 and the second power tube M2 to turn on.
The operation principle of the 4th comparator A4 is：The current value of the 4th comparator A4 inverting inputs is more than institute
When stating the normalized current of the 4th comparator A4, the logic control circuit 127 is driven by first drive circuit 124 and second
Dynamic circuit 125 controls the first power tube M1 and the second power tube M2 to end, the 4th comparator A4 inverting inputs
When current value is less than the normalized current of the 4th comparator A4, the logic control circuit 127 drives electricity by described first
The drive circuit 125 of road 124 and second controls the first power tube M1 and the second power tube M2 to turn on.
Further, in the present embodiment, the controller 120 is additionally provided with voltage stabilizing port BST.The voltage stabilizing port
BST one end is connected with the charge pump 126, the other end is connected by electric capacity of voltage regulation C1 with the anode interface 150.
Further, in the present embodiment, the battery protecting circuit 100 also includes filter circuit 170, the filtered electrical
Road 170 is arranged between the anode interface 150 and the second source port VDD.
Alternatively, the filter circuit 170 can be diversified forms, unrestricted.In the present embodiment, the filtered electrical
Road 170 can include the 4th resistance R6 and filter capacitor C2.One end of the 4th resistance R6 and the anode interface 150
Connection, the other end are connected with the second source port VDD.One end of the filter capacitor C2 and the second source port
VDD connections, the other end are connected with the grounding ports GND.
With reference to Fig. 6, the embodiment of the present invention also provides a kind of lithium battery circuit 10, including lithium battery 200 and the battery are protected
Protection circuit 100, the positive pole of the lithium battery 200 is connected with the anode interface 150, negative pole and the GND interface
160 connections.
The lithium battery 200 can be realized discharging external circuit by the battery protecting circuit 100, or outside
Power supply can realize the charging to the lithium battery 200 by the battery protecting circuit 100.
In sum, the present invention is provided a kind of battery protecting circuit 100 and lithium battery circuit 10, by controller
Integrated reverse-connection protection circuit between 120 the first power port VM and second source port VDD, solves existing battery protection skill
There is a problem of that reliability is low because being susceptible to short circuit during production and use in art, be effectively improved battery protection electricity
The security on road 100.Secondly, the first power tube M1 and the second power tube M2 uses N-type power tube, solves in the prior art
Because using cause p-type power tube high cost, it is resistance to force down and problem that impedance is big, drastically increase battery protecting circuit
100 practicality.Finally, it is connected by by the drain electrode of the first power tube M1 and the second power tube M2, it is possible to achieve the first power
The integral packaging of pipe M1 and the second power tube M2, significantly reduces the manufacturing cost of battery protecting circuit 100, further carries
The practicality of battery protecting circuit 100 high.
Obviously, those skilled in the art should be understood that the function of the above-mentioned embodiment of the present invention can use general meter
Calculate device to realize, they can be concentrated on single computing device, or are distributed in the net that multiple computing devices are constituted
On network, alternatively, the existing program code or algorithm that they can be can perform with computing device be realized, it is thus possible to by it
Store and performed by computing device in the storage device, or they are fabricated to each integrated circuit modules respectively, or
Multiple modules or step in them are fabricated to single integrated circuit module to realize.So, functions implementing the present invention are not
Any specific hardware and software is limited to combine.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of battery protecting circuit, it is characterised in that connect including charge/discharge circuit (110), controller (120), positive source
Mouth (130), power cathode interface (140), anode interface (150) and GND interface (160), the charge/discharge
Circuit (110) includes the first power tube (M1) and the second power tube (M2), and the controller (120) is provided with the first driving port
(DO), second port (CO), the first power port (VM), second source port (VDD) and grounding ports (GND) are driven, and
And it is integrated with reverse-connection protection circuit；
The source electrode of first power tube (M1) is connected with the positive source interface (130), drains and second power tube
(M2) drain electrode connection, grid drive port (DO) to be connected with described first, the grid of second power tube (M2) with it is described
Second drives port (CO) connection, source electrode to be connected with the anode interface (150), the power cathode interface (140) point
It is not connected with the GND interface (160) and the grounding ports (GND), first power port (VM) and the electricity
Source anode interface (130) is connected, and the second source port (VDD) is connected with the anode interface (150), the reversal connection
Protection circuit is connected between first power port (VM) and second source port (VDD)；
When the positive source interface (130) is connected with power cathode, the reverse-connection protection circuit cut off the power supply with it is described
Current path between controller (120)；
When the anode interface (150) is connected with GND, the reverse-connection protection circuit cut off the battery with it is described
Current path between controller (120)；
The controller (120) drives port (DO) and second to drive port (CO) to control described first respectively by described first
The grid voltage of power tube (M1) and the grid voltage of the second power tube (M2), so as to control first power tube (M1) and
Two power tubes (M2) on or off, and then control charge/discharge circuit (110) on or off.
2. battery protecting circuit according to claim 1, it is characterised in that first power tube (M1) and described second
Power tube (M2) is N-type power tube.
3. battery protecting circuit according to claim 1, it is characterised in that the reverse-connection protection circuit includes the first reversal connection
Protection circuit (121), the second reverse-connection protection circuit (122) and charging circuit (123)；
The first end of first reverse-connection protection circuit (121) is connected with first power port (VM), the second end with it is described
The first end connection of charging circuit (123), first end and the second source port of second reverse-connection protection circuit (122)
(VDD) connection, the second end are connected with the second end of the charging circuit (123)；
When the magnitude of voltage of the battery is less than preset value, first power tube (M1) and the second power tube (M2) end, described
Charging circuit (123) is turned on, and the power supply is charged by the reverse-connection protection circuit to the battery；
When the magnitude of voltage of the battery is more than the preset value, first power tube (M1) and the second power tube (M2) are turned on,
Charging circuit (123) cut-off, the power supply is charged by the charge/discharge circuit (110) to the battery.
4. battery protecting circuit according to claim 3, it is characterised in that the controller (120) is also integrated with first
Drive circuit (124), the second drive circuit (125) and charge pump (126)；
One end of the charge pump (126) is connected with the second end of second reverse-connection protection circuit (122), the other end respectively with
First drive circuit (124) and the second drive circuit (125) are connected, first drive circuit (124) and described first
Port (DO) connection is driven, second drive circuit (125) drives port (CO) to be connected with described second；
The voltage signal of the second source port (VDD) after the increase of the charge pump (126) by sending to described first
Drive circuit (124) and the second drive circuit (125), and drive port (DO) and second to drive port (CO) by described first
The grid voltage of first power tube (M1) and the grid voltage of the second power tube (M2) are controlled, so as to control first work(
Rate pipe (M1) and the second power tube (M2) on or off, and then control charge/discharge circuit (110) on or off.
5. battery protecting circuit according to claim 4, it is characterised in that the controller (120) is additionally provided with voltage stabilizing
Port (BST), described voltage stabilizing port (BST) one end is connected with the charge pump (126), the other end by electric capacity of voltage regulation (C1) with
Anode interface (150) connection.
6. battery protecting circuit according to claim 4, it is characterised in that the controller (120) is also integrated with logic
Control circuit (127), the logic control circuit (127) respectively with first drive circuit (124) and the second drive circuit
(125) connect, and drive port (DO) and second to drive port (CO) to control first power tube (M1) by described first
With the second power tube (M2) on or off.
7. battery protecting circuit according to claim 6, it is characterised in that (120 are also integrated with the first ratio to the controller
Compared with device (A1) and the second comparator (A2), the inverting input of the first comparator (A1) by first resistor (R3) with it is described
The overcharge voltage protection end of the connection of the second end, output end and logic control circuit (127) of the second reverse-connection protection circuit (122)
(OVP) connection, normal phase input end are connected with the inverting input of second comparator (A2), second comparator (A2)
Output end is connected with the overdischarge voltage protection end (UVP) of the logic control circuit (127), normal phase input end is respectively by the
Two resistance (R4) are connected with the inverting input of the first comparator (A1) and 3rd resistor (R5) connects with grounding ports (GND)
Connect；
When the magnitude of voltage of first comparator (A1) inverting input is more than the normal voltage of the first comparator (A1), institute
State logic control circuit (127) and first work(is controlled by first drive circuit (124) and the second drive circuit (125)
Rate pipe (M1) and the second power tube (M2) end, and the magnitude of voltage of first comparator (A1) inverting input is less than described first
During the normal voltage of comparator (A1), the logic control circuit (127) is driven by first drive circuit (124) and second
Dynamic circuit (125) controls first power tube (M1) and the second power tube (M2) conducting；
When the magnitude of voltage of the second comparator (A2) normal phase input end is less than the normal voltage of second comparator (A2), institute
State logic control circuit (127) and first work(is controlled by first drive circuit (124) and the second drive circuit (125)
Rate pipe (M1) and the second power tube (M2) end, and the magnitude of voltage of the second comparator (A2) normal phase input end is more than described second
During the normal voltage of comparator (A2), the logic control circuit (127) is driven by first drive circuit (124) and second
Dynamic circuit (125) controls first power tube (M1) and the second power tube (M2) conducting.
8. battery protecting circuit according to claim 6, it is characterised in that the controller (120) is also integrated with the 3rd
Comparator (A3) and the 4th comparator (A4), normal phase input end and first reverse connecting protection electricity of the 3rd comparator (A3)
It is the second end connection on road (121), discharge over-current protection end (OCP) connection of output end and logic control circuit (127), anti-phase
Input is connected with the normal phase input end of the 4th comparator (A4), and the output end of the 4th comparator (A4) is patrolled with described
Collect charge over-current protection end (OCCP) connection, inverting input and the 3rd comparator (A3) of control circuit (127)
Normal phase input end is connected；
When the current value of the 3rd comparator (A3) normal phase input end is more than the normalized current of the first comparator (A1), institute
State logic control circuit (127) and first work(is controlled by first drive circuit (124) and the second drive circuit (125)
Rate pipe (M1) and the second power tube (M2) end, and the current value of the 3rd comparator (A3) normal phase input end is less than the described 3rd
During the normalized current of comparator (A3), the logic control circuit (127) is driven by first drive circuit (124) and second
Dynamic circuit (125) controls first power tube (M1) and the second power tube (M2) conducting；
When the current value of the 4th comparator (A4) inverting input is more than the normalized current of the 4th comparator (A4), institute
State logic control circuit (127) and first work(is controlled by first drive circuit (124) and the second drive circuit (125)
Rate pipe (M1) and the second power tube (M2) end, and the current value of the 4th comparator (A4) inverting input is less than the described 4th
During the normalized current of comparator (A4), the logic control circuit (127) is driven by first drive circuit (124) and second
Dynamic circuit (125) controls first power tube (M1) and the second power tube (M2) conducting.
9. battery protecting circuit according to claim 1, it is characterised in that the battery protecting circuit also includes filtered electrical
Road (170), the filter circuit (170) be arranged at the anode interface (150) and the second source port (VDD) it
Between.
10. a kind of lithium battery circuit (10), it is characterised in that including described in lithium battery (200) and claim 1-9 any one
Battery protecting circuit (100), the positive pole of the lithium battery (200) is connected with the anode interface (150), negative pole and institute
State GND interface (160) connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710257796.2A CN106849290A (en) | 2017-04-19 | 2017-04-19 | A kind of battery protecting circuit and lithium battery circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710257796.2A CN106849290A (en) | 2017-04-19 | 2017-04-19 | A kind of battery protecting circuit and lithium battery circuit |
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| Publication Number | Publication Date |
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| CN106849290A true CN106849290A (en) | 2017-06-13 |
Family
ID=59148250
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710257796.2A Pending CN106849290A (en) | 2017-04-19 | 2017-04-19 | A kind of battery protecting circuit and lithium battery circuit |
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Cited By (1)
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| CN110048478A (en) * | 2019-04-22 | 2019-07-23 | 上海芯荃微电子科技有限公司 | There is the emergency power supply driving circuit of reverse connecting protection |
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Effective date of registration: 20210128 Address after: No.2, 6th floor, building 1, 88 Tianchen Road, high tech Zone, Chengdu, Sichuan 610000 Applicant after: Chengdu Tuoer Microelectronics Co.,Ltd. Address before: 4027, building 1, 88 Tianchen Road, high tech Zone (West District), Chengdu, Sichuan 610000 Applicant before: CHENGDU SMART INTEGRATED TECHNOLOGY Co.,Ltd. |
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Application publication date: 20170613 |