CN108258745A - It is a kind of that there is the charging of high-current switch formula and chip and the application of power management function - Google Patents
It is a kind of that there is the charging of high-current switch formula and chip and the application of power management function Download PDFInfo
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- CN108258745A CN108258745A CN201611240417.0A CN201611240417A CN108258745A CN 108258745 A CN108258745 A CN 108258745A CN 201611240417 A CN201611240417 A CN 201611240417A CN 108258745 A CN108258745 A CN 108258745A
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- 238000007600 charging Methods 0.000 title claims abstract description 107
- 239000004065 semiconductor Substances 0.000 claims description 38
- 230000005611 electricity Effects 0.000 claims description 15
- 230000003321 amplification Effects 0.000 claims description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 10
- 230000006837 decompression Effects 0.000 claims description 9
- 230000001360 synchronised effect Effects 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 7
- 229910052744 lithium Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 108010084652 homeobox protein PITX1 Proteins 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
Classifications
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- H02J7/0072—
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- 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
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention relates to a kind of with the charging of high-current switch formula and chip and the application of power management function, the chip is equipped with Input voltage terminal VIN, inductance incoming end SW, mode selection terminal VBAT, bootstrap charge circuit end BST, pressure feedback port FB and rechargeable battery incoming end BAT, and mode determination, pressure unit and charhing unit are equipped in the chip.Compared with prior art, mode determination of the present invention is by the difference of external pin mode selection terminal VBAT connection modes come automatic identification operating mode, it is achieved thereby that the multiple functions of chip is integrated, chip manufacturing development cost is reduced, there is good cost performance.
Description
Technical field
The present invention relates to a kind of power supply chip and applications, have the charging of high-current switch formula and power supply more particularly, to one kind
The chip of management function and application.
Background technology
Power Management Unit (Power Manage Unit, PMU), is a kind of highly integrated, for portable use
Power management scheme if Ganlei's Power Management Devices of traditional discrete are incorporated within single encapsulation, can be achieved in this way
Higher power supply conversion efficiency and more low-power consumption and less package count are to adapt to the plate grade space reduced.
In addition the switching regulator charging of high current can also individually be carried out while with power management function by how realizing
It is the hot spot studied at present.
Currently on the market to can realize large current charge and carry out current management chip demand it is more and more,
Need the demand for several power supply chips being integrated in a chip also more and more, and charging management chip function list in the market
One, and function is not modularization, it is impossible to there is good cost performance.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind is opened with high current
Pass formula charging and chip and the application of power management function.
The purpose of the present invention can be achieved through the following technical solutions：
It is a kind of with high-current switch formula charging and power management function chip, the chip be equipped with Input voltage terminal VIN,
Inductance incoming end SW, mode selection terminal VBAT, bootstrap charge circuit end BST, pressure feedback port FB and rechargeable battery incoming end BAT, should
Mode determination, pressure unit and charhing unit are equipped in chip；
For the Input voltage terminal VIN for connecting input power, the inductance incoming end SW is electric for connecting output
Feel L, the bootstrap charge circuit end BST is used for through capacitance CbstConnect inductance incoming end SW so that with the pressure unit in chip
Reduction voltage circuit is formed, the mode selection terminal VBAT is for selecting chip operation pattern, when chip is used for high current
When switching regulator charges, mode selection terminal VBAT is used to connect the outputting inductance L of inductance incoming end SW connections, when chip is used for power supply
During management, for being directly connected to charge power supply, the battery incoming end BAT is used to connect rechargeable battery to be charged VBAT,
The charhing unit is connected between mode selection terminal VBAT and rechargeable battery incoming end BAT, the pressure feedback port FB
For connecting reduction voltage circuit output terminal and will be in the control circuit of reduction voltage circuit Voltage Feedback to pressure unit；
When chip starts work, mode determination judges chip operation mould according to the connection of mode selection terminal VBAT
Formula simultaneously controls chip operation under corresponding modes, when working in high-current switch formula charge mode, the mode selection terminal
VBAT is connected to charhing unit as the voltage output end of reduction voltage circuit, and then charhing unit is connected to rechargeable battery to be charged
Carry out battery charging；When working in powder source management mode, the reduction voltage circuit and charging circuit are mutual indepedent, input voltage
End VIN by reduction voltage circuit be depressured and pass through inductance incoming end SW access outputting inductance L output bucks after voltage, mould
The charge power supply of formula selection end VBAT connections charges to rechargeable battery to be charged by charhing unit.
The reduction voltage circuit is synchronous buck circuit.
The charhing unit includes metal-oxide-semiconductor Q3, the metal-oxide-semiconductor Q3 drain electrode connection mode selection end VBAT, MOS
Pipe Q3 source electrodes connection rechargeable battery incoming end BAT.
The mode determination puts device EA4, error amplifier EA5 and processor including error, and the error is put
Big device error puts device EA4 input terminals connection mode selection end VBAT and rechargeable battery incoming end BAT, error amplifier EA4 output
End connection error amplifier EA5 input terminals, amplifier EA5 output terminal connection processing devices, error amplifier EA4 and error amplifier
EA5 is amplified the voltage deviation of input terminal connection mode selection end VBAT and rechargeable battery incoming end BAT, and processor judges
Error size, when voltage deviation, which is more than, is less than 0.7V, processor judges chip operation in high-current switch formula charge mode, when
When voltage deviation is more than 0.7V, processor judges chip operation in powder source management mode.
The chip is equipped with logic control element, pwm unit and charging current control unit, the logic control
The unit connection mode determination, the logic control element is according to the mode decision result control of mode determination
The operating mode of pwm unit and charging current control unit under different mode processed.
The charging current control unit includes the charging current being set on chip setting foot ISET and and pattern
The error that judging unit shares puts device EA4 and error amplifier EA5, and charging current setting foot ISET is used to connect charging current tune
Whole resistance, chip interior are equipped with the constant-current source of connection charging current setting foot ISET, and error amplifier EA5 input terminals are also connected with filling
Electric current setting foot ISET；
When working in high-current switch formula charge mode, logic control element exports high level to metal-oxide-semiconductor Q3, metal-oxide-semiconductor
Q3 is opened as switch, and error puts device EA4 and amplifies the voltage deviation of mode selection terminal VBAT and rechargeable battery incoming end BAT
To first voltage deviation, error puts device EA5 and puts the voltage progress error of first voltage deviation and charging current setting foot ISET
Second voltage deviation is obtained after big, second voltage deviation is input to pwm unit and carries out pulsewidth modulation by logic control element
Control reduction voltage circuit switching tube turns on and off carry out current constant control；
When working in powder source management mode, logic control element control pulse-width modulation circuit work, and then control decompression
Circuit is depressured work, while logic control element control metal-oxide-semiconductor Q3 is operated in amplification region.
The chip further includes charging instruction unit, the charging instruction unit include first comparator, the second comparator,
NAND gate, NOT gate, metal-oxide-semiconductor Q4 and metal-oxide-semiconductor Q5, first comparator anode connection rechargeable battery incoming end BAT, first comparator are born
Pole connects reference voltage, the second comparator anode connection reference voltage, the second comparator cathode connection rechargeable battery incoming end
BAT, first comparator and the second comparator output terminal connect NAND gate input terminal, and NAND gate output terminal connects MOS by NOT gate
Pipe Q4 grids, NAND gate output terminal are additionally coupled to metal-oxide-semiconductor Q5 grids, metal-oxide-semiconductor Q4 and metal-oxide-semiconductor Q5 source groundings, metal-oxide-semiconductor Q4 leakages
Pole forms the end charging indicator light connection pin of chip, and metal-oxide-semiconductor Q5 drains to form the charging indicator light connection pin of chip.
The chip charges for the high-current switch formula of accumulator, the Input voltage terminal VIN connection input powers, institute
The bootstrap charge circuit end BST stated passes through capacitance CbstInductance incoming end SW, inductance incoming end SW is connected to select by inductance L connection modes
End VBAT is selected, mode selection terminal VBAT is connected in series with resistance R1 and resistance R2, and resistance R2 adjusts resistance by electrical current and connects
Foot ISET is set to charging current, resistance R1 and resistance R2 intermediate connection points are connected to pressure feedback port FB, charging electricity
Pond incoming end BAT connections accumulator to be charged.
The chip is used to carry out power management, the Input voltage terminal VIN connection input powers, the bootstrap charge circuit
End BST passes through capacitance CbstIt is voltage dropping power supply output terminal that inductance incoming end SW, inductance incoming end SW, which are connected, by inductance L, and decompression is electric
Source output terminal is also connected in series with resistance R1 and resistance R2, and resistance R2 adjusts resistance by electrical current and is connected to charging current setting foot
ISET, resistance R1 and resistance R2 intermediate connection points are connected to pressure feedback port FB, and then form the reduction voltage circuit of a completion；Together
When, mode selection terminal VBAT connection charge power supplies, rechargeable battery incoming end BAT connections accumulator to be charged forms one solely
Vertical charging circuit, and then the chip forms the power management core of a decompression for being carried out at the same time input power and accumulator charging
Piece.
Compared with prior art, the invention has the advantages that：
(1) mode determination, pressure unit and charhing unit are integrated in same chip by the present invention, mode decision list
Member by the difference of external pin mode selection terminal VBAT connection modes come automatic identification operating mode, it is achieved thereby that chip
Multiple functions it is integrated, reduce chip manufacturing development cost, have good cost performance.
(2) present invention setting charging current sets foot ISET, and the convenient charging current by adjusting ISET connections adjusts electricity
It hinders to adjust charging current, it is versatile, meet the needs of different clients are to charging current；
(3) present invention has the chip application circuit of the charging of high-current switch formula and power management function simple, convenient for visitor
Family uses.
Description of the drawings
Fig. 1 is the circuit structure diagram for the chip that the present invention has the charging of high-current switch formula and power management function；
Fig. 2 is the circuit structure diagram that chip application of the present invention charges in high-current switch formula；
Fig. 3 is chip application of the present invention in the circuit structure diagram of the chip of power management function.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
It is a kind of with high-current switch formula charging and power management function chip, the chip be equipped with Input voltage terminal VIN,
Inductance incoming end SW, mode selection terminal VBAT, bootstrap charge circuit end BST, pressure feedback port FB and rechargeable battery incoming end BAT, should
Mode determination, pressure unit and charhing unit are equipped in chip；
For the Input voltage terminal VIN for connecting input power, the inductance incoming end SW is electric for connecting output
Feel L, the bootstrap charge circuit end BST is used for through capacitance CbstConnect inductance incoming end SW so that with the pressure unit in chip
Reduction voltage circuit is formed, the mode selection terminal VBAT is for selecting chip operation pattern, when chip is used for high current
When switching regulator charges, mode selection terminal VBAT is used to connect the outputting inductance L of inductance incoming end SW connections, when chip is used for power supply
During management, for being directly connected to charge power supply, the battery incoming end BAT is used to connect rechargeable battery to be charged VBAT,
The charhing unit is connected between mode selection terminal VBAT and rechargeable battery incoming end BAT, the pressure feedback port FB
For connecting reduction voltage circuit output terminal and will be in the control circuit of reduction voltage circuit Voltage Feedback to pressure unit；
When chip starts work, mode determination judges chip operation mould according to the connection of mode selection terminal VBAT
Formula simultaneously controls chip operation under corresponding modes, when working in high-current switch formula charge mode, the mode selection terminal
VBAT is connected to charhing unit as the voltage output end of reduction voltage circuit, and then charhing unit is connected to rechargeable battery to be charged
Carry out battery charging；When working in powder source management mode, the reduction voltage circuit and charging circuit are mutual indepedent, input voltage
End VIN by reduction voltage circuit be depressured and pass through inductance incoming end SW access outputting inductance L output bucks after voltage, mould
The charge power supply of formula selection end VBAT connections charges to rechargeable battery to be charged by charhing unit.
The reduction voltage circuit is synchronous buck circuit.
The charhing unit includes metal-oxide-semiconductor Q3, the metal-oxide-semiconductor Q3 drain electrode connection mode selection end VBAT, MOS
Pipe Q3 source electrodes connection rechargeable battery incoming end BAT.
The mode determination puts device EA4, error amplifier EA5 and processor including error, and the error is put
Big device error puts device EA4 input terminals connection mode selection end VBAT and rechargeable battery incoming end BAT, error amplifier EA4 output
End connection error amplifier EA5 input terminals, amplifier EA5 output terminal connection processing devices, error amplifier EA4 and error amplifier
EA5 is amplified the voltage deviation of input terminal connection mode selection end VBAT and rechargeable battery incoming end BAT, and processor judges
Error size, when voltage deviation, which is more than, is less than 0.7V, processor judges chip operation in high-current switch formula charge mode, when
When voltage deviation is more than 0.7V, processor judges chip operation in powder source management mode.
The chip is equipped with logic control element, pwm unit and charging current control unit, the logic control
The unit connection mode determination, the logic control element is according to the mode decision result control of mode determination
The operating mode of pwm unit and charging current control unit under different mode processed.
The charging current control unit includes the charging current being set on chip setting foot ISET and and pattern
The error that judging unit shares puts device EA4 and error amplifier EA5, and charging current setting foot ISET is used to connect charging current tune
Whole resistance, chip interior are equipped with the constant-current source of connection charging current setting foot ISET, and error amplifier EA5 input terminals are also connected with filling
Electric current setting foot ISET；
When working in high-current switch formula charge mode, logic control element exports high level to metal-oxide-semiconductor Q3, metal-oxide-semiconductor
Q3 is opened as switch, and error puts device EA4 and amplifies the voltage deviation of mode selection terminal VBAT and rechargeable battery incoming end BAT
To first voltage deviation, error puts device EA5 and puts the voltage progress error of first voltage deviation and charging current setting foot ISET
Second voltage deviation is obtained after big, second voltage deviation is input to pwm unit and carries out pulsewidth modulation by logic control element
Control reduction voltage circuit switching tube turns on and off carry out current constant control；
When working in powder source management mode, logic control element control pulse-width modulation circuit work, and then control decompression
Circuit is depressured work, while logic control element control metal-oxide-semiconductor Q3 is operated in amplification region.
The chip further includes charging instruction unit, the charging instruction unit include first comparator, the second comparator,
NAND gate, NOT gate, metal-oxide-semiconductor Q4 and metal-oxide-semiconductor Q5, first comparator anode connection rechargeable battery incoming end BAT, first comparator are born
Pole connects reference voltage, the second comparator anode connection reference voltage, the second comparator cathode connection rechargeable battery incoming end
BAT, first comparator and the second comparator output terminal connect NAND gate input terminal, and NAND gate output terminal connects MOS by NOT gate
Pipe Q4 grids, NAND gate output terminal are additionally coupled to metal-oxide-semiconductor Q5 grids, metal-oxide-semiconductor Q4 and metal-oxide-semiconductor Q5 source groundings, metal-oxide-semiconductor Q4 leakages
Pole forms the end charging indicator light connection pin of chip, and metal-oxide-semiconductor Q5 drains to form the charging indicator light connection pin of chip.
The chip charges for the high-current switch formula of accumulator, the Input voltage terminal VIN connection input powers, institute
The bootstrap charge circuit end BST stated passes through capacitance CbstInductance incoming end SW, inductance incoming end SW is connected to select by inductance L connection modes
End VBAT is selected, mode selection terminal VBAT is connected in series with resistance R1 and resistance R2, and resistance R2 adjusts resistance by electrical current and connects
Foot ISET is set to charging current, resistance R1 and resistance R2 intermediate connection points are connected to pressure feedback port FB, charging electricity
Pond incoming end BAT connections accumulator to be charged.
The chip is used to carry out power management, the Input voltage terminal VIN connection input powers, the bootstrap charge circuit
End BST passes through capacitance CbstIt is voltage dropping power supply output terminal that inductance incoming end SW, inductance incoming end SW, which are connected, by inductance L, and decompression is electric
Source output terminal is also connected in series with resistance R1 and resistance R2, and resistance R2 adjusts resistance by electrical current and is connected to charging current setting foot
ISET, resistance R1 and resistance R2 intermediate connection points are connected to pressure feedback port FB, and then form the reduction voltage circuit of a completion；Together
When, mode selection terminal VBAT connection charge power supplies, rechargeable battery incoming end BAT connections accumulator to be charged forms one solely
Vertical charging circuit, and then the chip forms the power management core of a decompression for being carried out at the same time input power and accumulator charging
Piece.
Fig. 1 is respectively VIN feet, provides the access of input voltage, simultaneously it is recognised that it is to have 11 feet that this chip, which has,
Voltage is provided to chip internal circuits.GND feet are grounding leg, and FB feet feed back foot for output voltage, and periphery needs connecting resistance network.
The control foot of EN feet position chip is realized chip operation and is not worked by low and high level.BST feet are the bootstrap charge circuit of chip
Foot, for the N-MOSFET of the Q1 inside driving chip.SW feet is connect inductance switch foot.VBAT feet are also control foot, when connecing electricity
Chip is used as high-current switch formula charging chip when sense, can be done when not connecing inductance and doing independent input voltage
It is used for Power Management Unit (PMU).ISET feet are the feet for setting charging current.BAT feet access foot for battery.Standby feet
With the access foot that CHARG feet are LED light, instruction battery has been completed in charging or charging.From the electricity of chip interior
Line structure can be seen that the circuit of the existing buck functionality of chip, and have the circuit of Charge Management function.VCCRegulator modules
It is that stable operating voltage VCC, reference module bandgap circuits are provided for chip interior, is the production of internal reference power supply
Raw module, EA1, EA2, EA3, EA4, EA5 are error amplifier, to signal amplification.Comparator1、Comparator2、
Comparator3 and Current Limit comparator are comparator, and ∑ is adder, and Oscillator is determines frequency vibration
Device is swung, Boost Regulator are BST capacitor charging circuits, and HS driver, LS driver and MOSFET driver are N-
The gate poles driving circuit of MOSFET.Comparator and On time control form the pwm unit of chip, Buck
Logical control are chip logic control unit.Q4 and Q5 and some NAND gates, logic or circuit constitute LED and refer to
Show lamp operating circuit.After the power-up, synchronous buck circuit does not work, and input no-voltage is transmitted to inductance incoming end SW, EA5 can be
To EA4 after VBAT feet voltage and the amplification of BAT feet voltage error, a judgement is done to internal logic circuit by EA4, when VBAT feet
It is less than 0.7V with BAT feet voltage, judges chip operation in Charge Management pattern, then logic control circuit is at this time to one high electricity
Flat control signal opens Q3, Q3 is only opened as a switching tube, VBAT and BAT conductings to the driving circuit of Q3.Then it synchronizes
Reduction voltage circuit is started to work, i.e. for the power tube Q1 and Q2 of chip according to fixed frequency alternate conduction, what Q1 and Q2 were formed is typical
Synchronous buck circuit because what VBAT feet and BAT feet were led directly to, the output voltage of reduction voltage circuit is to follow charging electricity to be charged
The voltage in pond, electric current flow to rechargeable battery to be charged by VBAT feet, Q3 and BAT feet, charge to rechargeable battery to be charged,
Charging current is also to be set by ISET feet, flows through the electric current on Q3 by detecting to realize, since Q3 is only used as one at this time
Switch, therefore voltage is converted the current into, the voltage deviation at VBAT and BAT ends is asked after EA4 amplifies with the voltage of ISET feet
Difference is again by, to pwm unit, as wherein one of input of PWM modulation circuit, participating in and accounting for after the amplification of EA5 errors
Sky is than in modulation circuit, by controlling output current to the modulation of duty ratio, reaching constant-current charge.
When VBAT feet and BAT feet voltage are more than 0.7V, amplified value is passed through EA5 to logic processing circuit by EA4,
Logic circuit is judged as that VBAT feet do not connect the output of inductance, it is believed that chip operation is in powder source management mode.Logic circuit can be controlled
Q3 processed is opened, while allows Q3's to be operated in amplification region, flows through the electric current of Q3 by ISET foot control systems, and the electric current for keeping flow through Q3 is stream
Cross ISET foot electric currents 1000 times.The Q1 and Q2 of preceding part work as typical synchronous buck circuit.
As shown in Fig. 2, a kind of application of the chip with the charging of high-current switch formula and power management function, the chip are used
It charges in the high-current switch formula of accumulator, Input voltage terminal VIN connection input powers, bootstrap charge circuit end BST passes through capacitance Cbst
It connects inductance incoming end SW, inductance incoming end SW and end VBAT is selected by inductance L connection modes, mode selection terminal VBAT series connection connects
Connecting resistance R1 and resistance R2, resistance R2 by electrical current adjust resistance be connected to charging current set foot ISET, resistance R1 and
Resistance R2 intermediate connection points are connected to pressure feedback port FB, rechargeable battery incoming end BAT connections accumulator to be charged.
When the VIN of chip connects input voltage (typically greater than 4V), chip is first to the VCCRegulator inside circuit
Circuit, Regulator circuits are exactly a LDO circuit, and for chip interior, other each functional circuits provide stable work electricity for he
VCC is pressed, there are VCC voltages, VCC voltages generate a base in the reference circuits by chip i.e. bandgap circuits
Quasi- voltage 0.6V is supplied to the error amplifier and comparator of chip interior, and the working time sequence of chip interior is first to judge
VBAT feet are outputed either with or without inductance output end is connect if connecing inductance, then chip is is operated in Charge Management state.At this time
What Q1, Q2 and inductance were formed is synchronous buck circuit, and Q1 and Q2 are alternate conductions, by the alternate conduction of Q1 and Q2 come to electricity
Energy storage and release energy is felt to battery, and when Q1 shutdown Q2 conductings, SW feet are equivalent to ground connection, and SW feet current potential is 0V, at this moment
By the Boost Regulator circuits of chip interior to CBST capacitor chargings, inductance is formed into a loop VIN by battery and Q2,
Inductance releases energy to lithium battery.When Q1 conducting Q2 shutdown when, VIN by Q1 to inductive energy storage, while again give lithium battery
Charging, SW voltages at this time are close to VIN, and due to the reason that the voltage at capacitance both ends cannot be mutated, the foot voltage of BST is elevated
The voltage that VIN voltage adds Cbst is arrived, operating voltage of the voltage as HS driver circuits after voltage superposition makes Q1 abundant
Conducting.The frequency of Q1 and Q2 alternate conductions has internal oscillator circuit (Oscillator) to generate fixed frequency 600KHz, accounts for
The size of empty ratio has error amplifier (EA2) decision.EA2 is R1 and the R2 electricity that an input terminal passes through periphery for FB feet, FB feet
Resistance is then passed to error amplifier (EA2) to detect VBAT foot voltage values, and error amplifier (EA2) give comparator and ON again
Time control circuits carry out pulsewidth modulation (PWM) and then go to respectively drive two power tubes of Q1 and Q2.Pwm signal high level
HS driver circuits is controlled to open Q1, control LS Driver circuit shutdowns Q2, the low level control HS driver of pwm signal
Circuit turns off Q1, and control LS Driver circuits open Q2, this when, reduction voltage circuit was started to work, and the voltage of VBAT is exactly to drop
The output of volt circuit, internal Ontime control circuits, which start simultaneously at, opens Q3, and VBAT is passed directly to BAT by Q3 at this time
Foot, because BAT feet connect battery, DC/DC reduction voltage circuits charge the battery.Charging current is by ISET foot controls at this time
System, because Q3 has conduction impedance, if by formula U=I*R it is found that testing the voltage drop to Q3 both ends, the conduction impedance of Q3 is
What technique determined, be fixed, then the electric current for flowing through Q3 has been known that, so the pressure drop at control Q3 both ends is exactly control electricity
The charging current in pond.The both ends pressure difference of Q3 puts device (EA4) with the current potential of ISET feet to compare by error, and comparison result is given
On time control circuits do pulsewidth modulation.Charging current is controlled by adjusting duty ratio.The logic control in charging process
Device processed opens Q5 by NAND gate, and CHARG feet are pulled low, and Q4 is off red indication LED (D1) at this time, is logical inverse with Q5
Relationship, STANDBY feet are high potentials, what green light was off.When cell voltage is charged to 4.2V, internal logic comparator
Internal reduction voltage circuit and charging circuit are turned off after voltage 4.2V by detecting BAT feet, that is, turns off Q1, Q2, Q3, this
When input voltage VIN and cell voltage BAT+ between block, prevent lithium battery from overcharging.Logic controller inverts at this time, leads to
NAND gate shutdown Q5 is crossed, then red light knocks out.Because the relationship of logical inverse, then Q4 is opened, and Standby feet are pulled low, green
Lamp is bright to get up.Instruction charging has been completed.
Under this operating mode, inductance L one end at this time be connect VBAT feet so as to form following charge circuits：VIN-
RS-Q1-SW-L-VBAT-Q3-BAT- batteries-GND.
As shown in figure 3, a kind of application of the chip with the charging of high-current switch formula and power management function, the chip are used
In carrying out power management, Input voltage terminal VIN connection input powers, bootstrap charge circuit end BST passes through capacitance CbstConnect inductance access
It is voltage dropping power supply output terminal by inductance L to hold SW, inductance incoming end SW, and voltage dropping power supply output terminal is also connected in series with resistance R1 and electricity
R2 is hindered, resistance R2 is connected among charging current setting foot ISET, resistance R1 and resistance R2 by electrical current adjustment resistance and connected
Point is connected to pressure feedback port FB, and then forms the reduction voltage circuit of a completion；Meanwhile mode selection terminal VBAT connections charging electricity
Source, rechargeable battery incoming end BAT connections accumulator to be charged form an independent charging circuit, and then the chip is formed
One decompression for being carried out at the same time input power and the power management chip of accumulator charging.VBAT feet have been can see from circuit
Through being separated from one end of inductance.VBAT-Q3-BAT- batteries-GND forms charge circuit.VIN-RS-Q1-L- decompressions are negative
Load-GND forms reduction voltage loop.
When VBAT and inductance are used separately, most of operating circuit of chip interior is described above, chip interior
Circuit can detect VBAT foot voltages, and chip interior logic circuit is told to be operated in PMU states, this function is known automatically for chip interior
Other technology.So under PMU states, input voltage enters chip by VIN feet, when each functional circuit work of chip interior
Afterwards, VIN realizes typical synchronous buck function by the alternate conduction of Q1 and Q2, the frequency of alternate conduction at this time be exactly by
The frequency for the fixed 600KHz that pierce circuit generates, inductance are the energy storage inductor of reduction voltage circuit, and one end of inductance is exactly to drop
The output (Buck_OUT) of volt circuit, the output of Buck_OUT to fix, occurrence by two feedback resistance R1 and R2 of FB Lai
Setting, formula are amplified the voltage value and benchmark 0.6V differences that detect by error for VOUT=0.6* (R1+R2)/R2, FB
The PWM control modules of the inside of chip are passed to after device EA2 amplifications to control, PWM modulation module is modulated according to the output of EA2
It is constant so as to fulfill output voltage to form negative-feedback in this way for duty ratio.
Since VBAT heels inductance detaches, the Q3 power tubes of chip can be operated in amplification region, and VBAT feet can conduct at this time
The input pin of the charging voltage of lithium battery, the other end of Q3 connect lithium battery by BAT feet, and ISET feet switching at this time is used for controlling
For the conducting degree of Q3 so as to control charging current, the charging current of lithium battery at this time is flow through ISET feet 1000 times.VBAT
Two voltages of foot and BAT feet pass to logic control circuit by EA4, realize the constant of charging current.When lithium battery fills
After full, the indicating circuit part working method of LED ibid describes, no longer burdensome herein.
Claims (9)
1. a kind of chip with the charging of high-current switch formula and power management function, which is characterized in that the chip is equipped with input
Voltage end VIN, inductance incoming end SW, mode selection terminal VBAT, bootstrap charge circuit end BST, pressure feedback port FB and rechargeable battery connect
Enter to hold BAT, mode determination, pressure unit and charhing unit are equipped in the chip；
For connecting input power, the inductance incoming end SW is used to connect outputting inductance L the Input voltage terminal VIN,
The bootstrap charge circuit end BST is used for through capacitance CbstIt connects inductance incoming end SW and then is formed with the pressure unit in chip
Reduction voltage circuit, the mode selection terminal VBAT is for selecting chip operation pattern, when chip is used for high-current switch
When formula charges, mode selection terminal VBAT is used to connect the outputting inductance L of inductance incoming end SW connections, when chip is used for power management
When, for VBAT for being directly connected to charge power supply, the battery incoming end BAT is described for connecting rechargeable battery to be charged
Charhing unit be connected between mode selection terminal VBAT and rechargeable battery incoming end BAT, the pressure feedback port FB is used for
Connection reduction voltage circuit output terminal simultaneously will be in the control circuit of reduction voltage circuit Voltage Feedback to pressure unit；
When chip starts work, mode determination judges chip operation pattern simultaneously according to the connection of mode selection terminal VBAT
Chip operation is controlled under corresponding modes, when working in high-current switch formula charge mode, the mode selection terminal VBAT
Voltage output end as reduction voltage circuit is connected to charhing unit, and then charhing unit is connected to rechargeable battery to be charged and carries out
Battery charges；When working in powder source management mode, the reduction voltage circuit and charging circuit are mutual indepedent, Input voltage terminal
VIN by reduction voltage circuit be depressured and pass through inductance incoming end SW access outputting inductance L output bucks after voltage, pattern
The charge power supply of selection end VBAT connections charges to rechargeable battery to be charged by charhing unit.
2. a kind of chip with the charging of high-current switch formula and power management function according to claim 1, feature
It is, the reduction voltage circuit is synchronous buck circuit.
3. a kind of chip with the charging of high-current switch formula and power management function according to claim 2, feature
It is, the charhing unit includes metal-oxide-semiconductor Q3, the metal-oxide-semiconductor Q3 drain electrode connection mode selection end VBAT, metal-oxide-semiconductor
Q3 source electrodes connection rechargeable battery incoming end BAT.
4. a kind of chip with the charging of high-current switch formula and power management function according to claim 3, feature
It is, the mode determination puts device EA4, error amplifier EA5 and processor, the error amplifier including error
Error puts device EA4 input terminals connection mode selection end VBAT and rechargeable battery incoming end BAT, error amplifier EA4 output terminal connect
Meet error amplifier EA5 input terminals, amplifier EA5 output terminal connection processing devices, error amplifier EA4 and error amplifier EA5
The voltage deviation of input terminal connection mode selection end VBAT and rechargeable battery incoming end BAT is amplified, processor judges to miss
Poor size, when voltage deviation, which is more than, is less than 0.7V, processor judges that chip operation in high-current switch formula charge mode, works as electricity
When pressing deviation more than 0.7V, processor judges chip operation in powder source management mode.
5. a kind of chip with the charging of high-current switch formula and power management function according to claim 4, feature
It is, which is equipped with logic control element, pwm unit and charging current control unit, the logic control element
The connection mode determination, the logic control element according to the mode decision output control of mode determination not
With pwm unit under pattern and the operating mode of charging current control unit.
6. a kind of chip with the charging of high-current switch formula and power management function according to claim 5, feature
It is, the charging current control unit includes the charging current being set on chip setting foot ISET and and mode decision
The error of units shared puts device EA4 and error amplifier EA5, and charging current setting foot ISET is electric for connecting charging current adjustment
Resistance, chip interior are equipped with the constant-current source of connection charging current setting foot ISET, and error amplifier EA5 input terminals are also connected with charging electricity
Stream setting foot ISET；
When working in high-current switch formula charge mode, logic control element exports high level to metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q3 work
It is opened for switch, error puts device EA4 and amplifies to obtain the by the voltage deviation of mode selection terminal VBAT and rechargeable battery incoming end BAT
One voltage deviation, error puts device EA5 will be after the voltage progress error amplification of first voltage deviation and charging current setting foot ISET
Second voltage deviation is obtained, second voltage deviation is input to pwm unit and carries out pulse width modulation controlled by logic control element
Reduction voltage circuit switching tube turns on and off carry out current constant control；
When working in powder source management mode, logic control element control pulse-width modulation circuit work, and then control reduction voltage circuit
Work is depressured, while logic control element control metal-oxide-semiconductor Q3 is operated in amplification region.
7. a kind of chip with the charging of high-current switch formula and power management function according to claim 1, feature
Be, which further includes charging instruction unit, the charging instruction unit include first comparator, the second comparator, with
NOT gate, NOT gate, metal-oxide-semiconductor Q4 and metal-oxide-semiconductor Q5, first comparator anode connection rechargeable battery incoming end BAT, first comparator cathode
Reference voltage, the second comparator anode connection reference voltage are connected, the second comparator cathode connects rechargeable battery incoming end BAT,
First comparator connects NAND gate input terminal with the second comparator output terminal, and NAND gate output terminal connects metal-oxide-semiconductor Q4 by NOT gate
Grid, NAND gate output terminal are additionally coupled to metal-oxide-semiconductor Q5 grids, metal-oxide-semiconductor Q4 and metal-oxide-semiconductor Q5 source groundings, metal-oxide-semiconductor Q4 drain electrode shapes
End charging indicator light into chip connects pin, and metal-oxide-semiconductor Q5 drains to form the charging indicator light connection pin of chip.
8. a kind of application of the chip as described in claim 1 with the charging of high-current switch formula and power management function,
It is characterized in that, which charges for the high-current switch formula of accumulator, the Input voltage terminal VIN connection input powers,
The bootstrap charge circuit end BST passes through capacitance CbstConnection inductance incoming end SW, inductance incoming end SW pass through inductance L connection modes
End VBAT, mode selection terminal VBAT is selected to be connected in series with resistance R1 and resistance R2, resistance R2 adjusts resistance by electrical current and connects
Charging current setting foot ISET is connected to, resistance R1 and resistance R2 intermediate connection points are connected to pressure feedback port FB, the charging
Battery incoming end BAT connections accumulator to be charged.
9. a kind of application of the chip as described in claim 1 with the charging of high-current switch formula and power management function,
It is characterized in that, the chip for carrying out power management, the Input voltage terminal VIN connection input powers, fill by the bootstrapping
Electric end BST passes through capacitance CbstIt is voltage dropping power supply output terminal that inductance incoming end SW, inductance incoming end SW, which are connected, by inductance L, is depressured
Power output end is also connected in series with resistance R1 and resistance R2, and resistance R2 adjusts resistance by electrical current and is connected to charging current setting
Foot ISET, resistance R1 and resistance R2 intermediate connection points are connected to pressure feedback port FB, and then form the reduction voltage circuit of a completion；
Meanwhile mode selection terminal VBAT connection charge power supplies, rechargeable battery incoming end BAT connections accumulator to be charged form one
Independent charging circuit, and then the chip forms the power management of a decompression for being carried out at the same time input power and accumulator charging
Chip.
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