CN205725016U - A kind of lithium battery reduced output voltage and charge and discharge protecting system - Google Patents
A kind of lithium battery reduced output voltage and charge and discharge protecting system Download PDFInfo
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Abstract
This utility model provides a kind of lithium battery reduced output voltage and charge and discharge protecting system, including a reference voltage and reference current generating circuit, Buck type DC/DC, a LDO, a Charger, a gate logic control circuit and voltage dividing resistance circuit；Reference voltage and reference current generating circuit make system keep the efficient state of heavy duty；LDO circuit makes system keep the efficient state of underloading；Charger circuit has the adjustable function of charging current, realizes the charge and discharge protecting of battery simultaneously；Gate logic control circuit realizes the switching of circuit Buck pattern and LDO pattern, and gate logic control circuit can also judge the entrance of USB system, makes Circuits System automatically into charge mode；Voltage dividing resistance circuit plays the effect of dividing potential drop, makes circuit both end voltage reduce.Thus realize lithium battery and be converted into the output of 1.5V DC voltage voltage and charge-discharge protection circuit system.
Description
Technical field
The present invention relates to battery reduced output voltage field, particularly a kind of lithium battery is converted into the output of 1.5V DC voltage voltage
And charge-discharge protection circuit system.
Background technology
Along with scientific and technological progress and social development, as mobile phone, notebook computer, MP3 player, PDA, handheld device, number
The portable sets such as code video camera are becoming increasingly popular, and having many in this series products is to use lithium ion battery to power, and exists at present
Main in the portable type electronic product that part power consumption is relatively low use non-rechargeabel disposable lithium-battery, and notebook computer,
The electronic product that the power consumption such as mobile phone, PDA, digital camera are bigger then uses chargeable secondary cell, i.e. lithium ion battery.
Compared with NI-G and Ni-MH battery, lithium ion battery possesses following advantage: voltage is high, and the voltage of single-unit lithium ion battery can
Reach 3.6V, far above the 1.2V voltage of NI-G and Ni-MH battery.Capacity density is big, and its capacity density is Ni-MH battery or NI-G
1.5-2.5 times of battery.Retention of charge is strong (i.e. self discharge is little), and after placing for a long time, its capacitance loss is the least.
Life-span is long, and normal its cycle life of use can reach more than 500 times.There is no memory effect, before charging need not be by dump energy
Emptying, easy to use.But in existing market, 1.5V DC voltage uses conventional dry cell batteries to provide mostly, such as bluetooth mouse, key
The electronic equipment such as dish and remote controller currently there are no the Circuits System into its offer lithium battery 1.5V direct voltage output, big manifold
Crossing aneroid battery to provide, aneroid battery has and can not reuse and energy density is low and expendable shortcoming.Again or at electricity
Not having charge-discharge protection circuit in the design of road, potential safety hazard has been buried safely in the use for lithium battery.
Summary of the invention
The invention provides a kind of environment for the application of 1.5V DC voltage for prior art problem, devise this electricity
Road, had both provided heavily loaded efficient, underloading efficient system application, and by the USB interface charging to lithium battery, had been simultaneously achieved
Battery charging and discharging is protected, and solves 1.5V DC voltage supply now and only makes the drawback that battery completes dry up.
A kind of lithium battery reduced output voltage and charge and discharge protecting system, including peripheral inductance L, battery, electric capacity, described protection
Circuit further comprises a reference voltage and reference current generating circuit, Buck type DC/DC, LDO, one
Charger, a gate logic control circuit and voltage dividing resistance circuit；Reference voltage and reference current generating circuit pass through Buck
Type DC/DC, LDO one end are connected with lithium battery and electric capacity C1, and the other end is connected with inductance L, then are connected with USB charging input end；
Buck type DC/DC one end is connected with LDO by voltage dividing resistance circuit, an interface of the other end and Charger, gate logic control
Circuit processed is connected, and another interface is connected with electric capacity, lithium battery；LDO one end is connected end phase with the battery capacitor of Buck type DC/DC
Even, one connector of the other end is connected with USB charging input end through voltage dividing resistance circuit, another connector through Charger and
Gate logic control circuit is connected；Charger one end be connected with USB charging input end through voltage dividing resistance circuit, the other end
With LDO, reference voltage and reference current generating circuit, Buck type DC/DC, gate logic control circuit, electric capacity C1, lithium battery phase
Even；Gate logic control circuit is connected with electric capacity C1, lithium battery by Buck type DC/DC, then by Charger Yu LDO and USB
Charging input end connects.
Described Buck DC/DC circuit include an error amplifier, PWM comparator, agitator, one
Current sampling circuit, slope compensation circuit, control logic circuit, PWM/PFM mode switching circuit, one defeated
Go out stage drive circuit, the power output tube of Buck, zero current detecting circuit and peak point current to limit and short-circuit protection circuit.Described
Buck DC/DC circuit error amplifier in is connected with VBG, VFB, and outfan is connected with comparator PWM, and comparator inputs
Hold two other port respectively one be connected with control logic circuit by slope compensation circuit, another by current sample and
PWM/PFM mode switching circuit is connected and peak point current limits and short-circuit protection circuit is connected, and comparator output terminal is patrolled with control
Collect circuit to be connected；Control logic circuit Single port is connected with agitator, and zero current detecting circuit and earth potential are passed through in another port
Connecting, control logic circuit also limits with peak point current and short-circuit protection is connected, and output stage drives and limits and short with peak point current
Road protection, zero current detecting circuit, power output tube are connected.
Described LDO circuit includes error amplifier, the output pipe of LDO, output current limiting protection circuit and compensates network.
Described LDO circuit error amplifier input terminal is connected with VBG, VFB, compensates network and is parallel to input amplifier two ends, output limit
Current circuit one end is connected with error amplifier output, and the other end is connected with power output tube.
Described lithium battery reduced output voltage and charge-discharge protection circuit, circuit enters in the case of output loading is less than 3mA
LDO pattern.
Described Charger circuit includes a precharge control circuit, constant current mode control circuit, a constant voltage mould
Formula control circuit, one recharge mode control circuit, Charger control logic circuit, Charger loop control circuit and benefit
Repay circuit, sleep mode detection circuit, thermal-shutdown circuit, reverse battery protection circuit, arrange charging current resistance and
The Power pipe of Charger.Precharge control circuit, constant current mode control circuit, constant voltage mode control in described Charger circuit
Circuit processed, recharging mode control circuit and be connected with Charger control logic circuit respectively, Charger control logic circuit divides
Not being connected with reverse battery protection circuit, sleep mode detection circuit and thermal-shutdown circuit, the other end passes through Charger ring
Road control circuit is connected with USB input and lithium battery, and charging current resistance one end is connected with Charger control logic circuit,
Other end earthing potential.
The concrete control methods of Charger circuit are as follows, enter precharge mode when cell voltage is less than 2.8V, with charging
Battery is charged by current setting value 1/10, when cell voltage is more than 2.8V, counts constant current charging mode, i.e. CC pattern,
Charging battery with setting charging current value, the voltage of battery increases linearly over time, until cell voltage reaches to preset
The upper limit 4.2V time, enter constant-voltage charge pattern, i.e. CV pattern, electric current gradually decays to setting charging current value 1/10, charging
Terminate.After charging terminates, if battery can automatically detect the voltage of battery also in connection status, Charger circuit, work as battery
When voltage is again below 4.0V, startup is recharged pattern by Charger circuit, until battery is full of.
The running voltage of lithium battery can be converted into the output of 1.5V voltage by the present invention, it is possible to achieve 1.5V unidirectional current is had a meeting, an audience, etc. well under one's control
The application closed, and gate logic control circuit judged by load, it is achieved the switching of Buck Yu LDO.
Beneficial effect, a kind of lithium battery that the present invention provides is converted into the output of 1.5V DC voltage voltage and charge and discharge protecting
Circuits System.Both achieved lithium battery 1.5V DC voltage voltage output, again can auto charge and discharge, be used conveniently and safely, efficiently
Environmental protection.
Accompanying drawing explanation
Fig. 1 is that lithium battery is converted into the output of 1.5V DC voltage voltage and by integrated to lithium cell charging of USB interface
The design application drawing of system；
Fig. 2 is the system construction drawing of Buck type DC/DC in system；
Fig. 3 is the system construction drawing of LDO in system；
Fig. 4 is the system construction drawing of Charger in system.
Specific embodiment
Below in conjunction with the accompanying drawings, a kind of lithium battery reduced output voltage and charge-discharge protection circuit to the present invention are made specifically
Bright.
A kind of lithium battery reduced output voltage and charge-discharge protection circuit, including peripheral inductance L, battery, electric capacity, described protection
Circuit further comprises a reference voltage and reference current generating circuit, Buck type DC/DC, LDO, one
Charger, a gate logic control circuit and voltage dividing resistance circuit；Reference voltage and reference current generating circuit pass through Buck
Type DC/DC, LDO one end are connected with lithium battery and electric capacity C1, and the other end is connected with inductance L, then are connected with USB charging input end；
Buck type DC/DC one end is connected with LDO by voltage dividing resistance circuit, an interface of the other end and Charger, gate logic control
Circuit processed is connected, and another interface is connected with electric capacity, lithium battery；LDO one end is connected end phase with the battery capacitor of Buck type DC/DC
Even, one connector of the other end is connected with USB charging input end through voltage dividing resistance circuit, another connector through Charger and
Gate logic control circuit is connected；Charger one end be connected with USB charging input end through voltage dividing resistance circuit, the other end
With LDO, reference voltage and reference current generating circuit, Buck type DC/DC, gate logic control circuit, electric capacity C1, lithium battery
It is connected；Gate logic control circuit is connected with electric capacity C1, lithium battery by Buck type DC/DC, then pass through Charger Yu LDO and
USB charging input end connects.
When system enters mode of operation, system first starts reference voltage and reference current generating circuit, it is provided that chip needs
Reference voltage and internal current, then judged by gate logic control circuit, when Vin voltage more than Vout voltage time,
And the voltage of Vin is in the voltage range of lithium battery, the most there is not punching and crossed the voltage status put, being then judged as the mould that discharges
Formula, judges output load current size simultaneously, when circuit enters LDO pattern, LDO electricity in the case of output loading is less than 3mA
Route error amplifier, the output pipe of LDO, output current limiting protection circuit and compensation network are constituted.First, the soft of LDO is opened
Chip internal electric capacity is charged by galvanic electricity road by constant current source, produces a stable stepped-slope slowly risen, when soft
After startup voltage is raised to reference voltage, the ramp voltage of soft start is deactivated, and VBG voltage and VFB voltage feeding error are put
Big device, the output of error amplifier controls the conducting of the output pipe of LDO, makes output voltage ensure the output of 1.5V.Pass through
Compensate network and ensure stablizing of system, and add output current limiting protection circuit, when LDO is in short-circuit condition, automatically adjust
The conducting degree of output pipe, it is ensured that system current limliting is at 100mA.
When Vin voltage is more than Vout voltage, and the voltage of Vin is in the voltage range of lithium battery, does not exists
Rush and cross the voltage status put, being then judged as discharge mode, judge output load current size simultaneously, when circuit is in output loading
For entering LDO pattern in the case of 2mA, LDO circuit is by error amplifier, the output pipe of LDO, output current limiting protection circuit
And compensate network composition.First, chip internal electric capacity is charged by the soft starting circuit of LDO by constant current source, produces one
The individual stable stepped-slope slowly risen, after soft start voltage is raised to reference voltage, the ramp voltage of soft start exits work
Making, VBG voltage sends into error amplifier with VFB voltage, and the output of error amplifier controls the conducting of the output pipe of LDO,
Output voltage is made to ensure the output of 1.5V.Ensure stablizing of system by compensating network, and add output current limiting protection circuit,
When LDO is in short-circuit condition, automatically adjust the conducting degree of output pipe, it is ensured that system current limliting is at 100mA.
When Vin voltage is more than Vout voltage, and the voltage of Vin is in the voltage range of lithium battery, does not exists
Rush and cross the voltage status put, being then judged as discharge mode, judge output load current size simultaneously, when circuit is in output loading
Less than entering LDO pattern in the case of 3mA, LDO circuit is by error amplifier, the output pipe of LDO, output current limiting protection electricity
Road and compensation network are constituted.First, chip internal electric capacity is charged by the soft starting circuit of LDO by constant current source, produces
One stable stepped-slope slowly risen, after soft start voltage is raised to reference voltage, the ramp voltage of soft start exits
Work, VBG voltage controls leading of the output pipe of LDO with VFB voltage feeding error amplifier, the output of error amplifier
Logical, make output voltage ensure the output of 1.5V.Ensure stablizing of system by compensating network, and add output current limiting protection electricity
Road, when LDO is in short-circuit condition, adjusts the conducting degree of output pipe, it is ensured that system current limliting is at 100mA automatically.
When LDO load is more than 30mA, system enters Buck mode of operation.During Buck work, first, soft starting circuit leads to
Cross constant current source chip internal electric capacity is charged, can effectively prevent surge current, produce a stable slowly rising
Stepped-slope, soft start first replaces reference voltage and feedback voltage V FB to compare, after soft start voltage is raised to reference voltage,
The ramp voltage of soft start is deactivated, and VBG voltage sends into error amplifier with VFB voltage, and error amplifier will after processing
Result and the sampling of inductive current and slope compensation signal together send into PWM comparator, and the result of PWM comparator sends into logic control
Circuit processed, the Power pipe of Buck is controlled by the drive circuit through output stage, by peripheral inductance, electric capacity and dividing potential drop
Resistor network obtains 1.5V output voltage.And the zero current detecting circuit in circuit, by LX node voltage is detected,
Judge that Buck is in CCM pattern or DCM pattern, by opening and shutting off of logic control switch tube, prevent inductive current
Reflux；Circuit also has peak point current protection and short-circuit protection function, prevents the electric current flowing through circuit excessive and cause
Damage to internal components.
When Vin voltage is less than Vout voltage, meet the Vout voltage voltage range in USB interface, the voltage of Vin simultaneously
In the voltage range of lithium battery, circuit enters Charger mode of operation.Described Charger circuit includes that a preliminary filling is automatically controlled
Circuit processed, constant current mode control circuit, constant voltage mode control circuit, one recharge mode control circuit,
Charger control logic circuit, Charger loop control circuit and compensation circuit, sleep mode detection circuit, overheat protector electricity
The Power pipe of road, reverse battery protection circuit, the resistance that charging current is set and Charger.It is anti-that circuit has battery plus-negative plate
Connect protection, use constant current/constant voltage linearly to control, have employed internal PMOSFET framework, add anti-down charging circuit, institute
Need not external sense resistor and isolating diode.Charging current can be automatically adjusted by thermal feedback, in order in big merit
Under rate operation or high ambient temperature conditions, chip temperature is any limitation as, the described Charger electricity when cell voltage is less than 2.8V
Road enters precharge mode, is charged battery with setting charging current value 1/10.
When Vin voltage is less than Vout voltage, meet the Vout voltage voltage range in USB interface, the voltage of Vin simultaneously
In the voltage range of lithium battery, circuit enters Charger mode of operation.Described Charger circuit includes that a preliminary filling is automatically controlled
Circuit processed, constant current mode control circuit, constant voltage mode control circuit, one recharge mode control circuit,
Charger control logic circuit, Charger loop control circuit and compensation circuit, sleep mode detection circuit, overheat protector electricity
The Power pipe of road, reverse battery protection circuit, the resistance that charging current is set and Charger.It is anti-that circuit has battery plus-negative plate
Connect protection, use constant current/constant voltage linearly to control, have employed internal PMOSFET framework, add anti-down charging circuit, institute
Need not external sense resistor and isolating diode.Charging current can be automatically adjusted by thermal feedback, in order in big merit
Under rate operation or high ambient temperature conditions, chip temperature is any limitation as, when cell voltage is more than 2.8V, counts constant-current charge
Pattern, i.e. CC pattern, with setting charging current value, battery is charged, the voltage of battery increases linearly over time, until battery electricity
Pressure reaches upper limit 4.2V set in advance.
When Vin voltage is less than Vout voltage, meet the Vout voltage voltage range in USB interface, the voltage of Vin simultaneously
In the voltage range of lithium battery, circuit enters Charger mode of operation.Described Charger circuit includes that a preliminary filling is automatically controlled
Circuit processed, constant current mode control circuit, constant voltage mode control circuit, one recharge mode control circuit,
Charger control logic circuit, Charger loop control circuit and compensation circuit, sleep mode detection circuit, overheat protector electricity
The Power pipe of road, reverse battery protection circuit, the resistance that charging current is set and Charger.It is anti-that circuit has battery plus-negative plate
Connect protection, use constant current/constant voltage linearly to control, have employed internal PMOSFET framework, add anti-down charging circuit, institute
Need not external sense resistor and isolating diode.Charging current can be automatically adjusted by thermal feedback, in order in big merit
Under rate operation or high ambient temperature conditions being any limitation as chip temperature, when cell voltage reaches 4.2V, Charger circuit enters
Entering constant-voltage charge pattern i.e. CV pattern, electric current gradually decays to setting charging current value 1/10, and charging terminates.
After charging terminates, if battery can detect the voltage of battery automatically also in connection status, Charger circuit, when
When cell voltage is again below 4.0V, startup is recharged pattern by Charger circuit, until battery is full of.
When Vin voltage is less than Vout voltage, meet the Vout voltage voltage range in USB interface, the voltage of Vin simultaneously
In the voltage range of lithium battery, circuit enters Charger mode of operation.Described Charger circuit includes that a preliminary filling is automatically controlled
Circuit processed, constant current mode control circuit, constant voltage mode control circuit, one recharge mode control circuit,
Charger control logic circuit, Charger loop control circuit and compensation circuit, sleep mode detection circuit, overheat protector electricity
The Power pipe of road, reverse battery protection circuit, the resistance that charging current is set and Charger.It is anti-that circuit has battery plus-negative plate
Connect protection, use constant current/constant voltage linearly to control, have employed internal PMOSFET framework, add anti-down charging circuit, institute
Need not external sense resistor and isolating diode.Charging current can be automatically adjusted by thermal feedback, in order in big merit
Chip temperature is any limitation as, when input voltage (AC adapter or USB power source) quilt under rate operation or high ambient temperature conditions
When taking away, system is automatically into a low current condition, and battery leakage current is at below 5uA.System is automatically into recharging pattern.
Present invention also offers a kind of Buck DC/DC circuit include that an error is put it addition, present invention also offers one
Big device, PWM comparator, agitator, current sampling circuit, slope compensation circuit, a control logic
Circuit, PWM/PFM mode switching circuit, output stage drive circuit, the power output tube of Buck, a zero current detection electricity
Road and peak point current limit and short-circuit protection circuit.Described Buck DC/DC circuit error amplifier in and VBG, VFB phase
Even, outfan is connected with comparator PWM, two other port of comparator input terminal respectively one by slope compensation circuit and
Control logic circuit be connected, another by current sample be connected with PWM/PFM mode switching circuit and peak point current restriction and
Short-circuit protection circuit is connected, and comparator output terminal is connected with control logic circuit；Control logic circuit Single port and agitator phase
Even, another port is connected with earth potential by zero current detecting circuit, and control logic circuit also limits with peak point current and short circuit
Protection is connected, and output stage drives and limits with peak point current and short-circuit protection, zero current detecting circuit, power output tube are connected.Institute
Chip internal electric capacity is charged by the soft starting circuit stating Buck DC/DC by constant current source, produces one and stablizes on slowly
Rise stepped-slope, after soft start voltage is raised to reference voltage, the ramp voltage of soft start is deactivated, VBG voltage with
VFB voltage is admitted to error amplifier, and sampling and the slope compensation of result with inductive current are believed after processing by error amplifier
Number together sending into PWM comparator, the result of PWM comparator sends into logic control circuit, through the drive circuit pair of output stage
The Power pipe of Buck is controlled, and obtains output voltage, and circuit by peripheral inductance, electric capacity and resistor voltage divider network
In zero current detecting circuit, by LX node voltage is detected, it is judged that Buck is in CCM pattern or DCM pattern, logical
Cross opening and shutting off of logic control switch tube；Circuit is additionally provided with peak point current protection and short-circuit protection function, prevents
The electric current flowing through circuit is excessive and the damage to internal components that causes.
Present invention also offers a kind of LDO circuit, including error amplifier, the output pipe of LDO, output current limiting protection
Circuit and compensation network.Described LDO circuit error amplifier input terminal is connected with VBG, VFB, and compensation network is parallel to input and puts
Big device two ends, output current-limiting circuit one end is connected with error amplifier output, and the other end is connected with power output tube.Circuit system
When system enters LDO pattern, chip internal electric capacity is charged by the soft starting circuit of LDO by constant current source, produces one surely
The fixed stepped-slope slowly risen, after soft start voltage is raised to reference voltage, the ramp voltage of soft start is deactivated,
VBG voltage sends into error amplifier with VFB voltage, and the output of error amplifier controls the conducting of the output pipe of LDO, makes defeated
Go out voltage and ensure the output for setting voltage, ensure stablizing of system by compensating network, and add output current limiting protection electricity
Road, when LDO is in short-circuit condition, automatically adjusts the conducting degree of output pipe, it is ensured that system current limliting set electric current with
In.
Present invention also offers a kind of Charger circuit, control including a precharge control circuit, a constant current mode
Circuit, constant voltage mode control circuit, one recharge mode control circuit, Charger control logic circuit, Charger
Loop control circuit and compensate circuit, sleep mode detection circuit, thermal-shutdown circuit, reverse battery protection circuit, setting are filled
The resistance of electricity electric current and the Power pipe of Charger..In described Charger circuit, precharge control circuit, constant current mode control
Circuit, constant voltage mode control circuit, recharge mode control circuit and be connected with Charger control logic circuit respectively, Charger
Control logic circuit is connected with reverse battery protection circuit, sleep mode detection circuit and thermal-shutdown circuit respectively, another
End is connected with USB input and lithium battery by Charger loop control circuit, and charging current resistance one end is controlled with Charger
Logic circuit processed connects, other end earthing potential.Described Charger circuit passes through precharge mode, constant current charging mode, constant voltage
Battery is charged by charge mode, the pattern that recharges, and has the adjustable function of charging current simultaneously.It is anti-that circuit has battery plus-negative plate
Connect protection, use constant current/constant voltage linearly to control, have employed internal PMOSFET framework, add anti-down charging circuit, institute
Need not external sense resistor and isolating diode.Charging current can be automatically adjusted by thermal feedback, in order in big merit
Chip temperature is any limitation as, when input voltage (AC adapter or USB power source) quilt under rate operation or high ambient temperature conditions
When taking away, system is automatically into a low current condition, and battery leakage current is at below 5uA.Simultaneity factor includes that charging current is supervised
Control device, undervoltage lockout, automatically recharge function.
Claims (10)
1. lithium battery reduced output voltage and a charge and discharge protecting system, including peripheral inductance L, battery, electric capacity, its feature exists
In: described lithium battery reduced output voltage and charge and discharge protecting system further comprises a reference voltage and reference current generating circuit,
One Buck type DC/DC, a LDO, a Charger, a gate logic control circuit and voltage dividing resistance circuit；Benchmark electricity
Pressure and reference current generating circuit are connected with lithium battery and electric capacity C1 by Buck type DC/DC, LDO one end, the other end and inductance L
Series connection, then be connected with USB charging input end；Buck type DC/DC one end is connected with LDO by voltage dividing resistance circuit, the other end
One interface is connected with Charger, gate logic control circuit, and another interface is connected with electric capacity, lithium battery；LDO one end with
The battery capacitor of Buck type DC/DC connects end and is connected, and one connector of the other end is through voltage dividing resistance circuit and USB charging input end
Connect, another connector is connected with gate logic control circuit through Charger；Charger one end is electric with through divider resistance
Road is connected with USB charging input end, the other end and LDO, reference voltage and reference current generating circuit, Buck type DC/DC, gating
Logic control circuit, electric capacity C1, lithium battery are connected；Gate logic control circuit is by Buck type DC/DC and electric capacity C1, lithium battery
It is connected, then is connected by Charger with LDO and USB charging input end.
Lithium battery reduced output voltage the most according to claim 1 and charge and discharge protecting system, it is characterised in that: described Buck
DC/DC circuit include an error amplifier, PWM comparator, agitator, current sampling circuit, one tiltedly
Slope compensates circuit, control logic circuit, PWM/PFM mode switching circuit, output stage drive circuit, Buck
Power output tube, zero current detecting circuit and peak point current limit and short-circuit protection circuit.
Lithium battery reduced output voltage the most according to claim 2 and charge and discharge protecting system, it is characterised in that: described Buck
DC/DC circuit error amplifier in is connected with VBG, VFB, and outfan is connected with comparator PWM, and comparator input terminal is another
Outer two ports difference one is connected with control logic circuit by slope compensation circuit, and another passes through current sample and PWM/
PFM mode switching circuit is connected and peak point current limits and short-circuit protection circuit is connected, comparator output terminal and control logic electricity
Road is connected；Control logic circuit Single port is connected with agitator, and another port is connected with earth potential by zero current detecting circuit,
Control logic circuit also limits with peak point current and short-circuit protection is connected, and output stage drives protects with peak point current restriction and short circuit
Protect, zero current detecting circuit, power output tube are connected.
4. according to the lithium battery reduced output voltage described in claim 3 and charge and discharge protecting system, it is characterised in that: when LDO bears
When carrying more than 30mA, system enters Buck mode of operation.
Lithium battery reduced output voltage the most according to claim 1 and charge and discharge protecting system, it is characterised in that: described LDO electricity
Road includes error amplifier, the output pipe of LDO, output current limiting protection circuit and compensates network.
Lithium battery reduced output voltage the most according to claim 5 and charge and discharge protecting system, it is characterised in that: in LDO circuit
Error amplifier input terminal is connected with VBG, VFB, compensates network and is parallel to input amplifier two ends, output current-limiting circuit one end with
Error amplifier output is connected, and the other end is connected with power output tube.
Lithium battery reduced output voltage the most according to claim 5 and charge and discharge protecting system, it is characterised in that: circuit is in output
Load is less than entering LDO pattern in the case of 3mA.
Lithium battery reduced output voltage the most according to claim 1 and charge and discharge protecting system, it is characterised in that: described
Charger circuit include a precharge control circuit, constant current mode control circuit, constant voltage mode control circuit,
One recharges mode control circuit, Charger control logic circuit, Charger loop control circuit and compensates circuit, sleep
Pattern detection circuit, thermal-shutdown circuit, reverse battery protection circuit, the resistance of charging current and the Power of Charger are set
Pipe.
Lithium battery reduced output voltage the most according to claim 6 and charge and discharge protecting system, it is characterised in that: described
Precharge control circuit, constant current mode control circuit, constant voltage mode control circuit in Charger circuit, recharge Schema control
Circuit is separately connected with Charger control logic circuit, Charger control logic circuit respectively with reverse battery protection circuit,
Sleep mode detection circuit and thermal-shutdown circuit are connected, and the other end passes through Charger loop control circuit and USB input
And lithium battery is connected, charging current resistance one end is connected with Charger control logic circuit, other end earthing potential.
10. according to described battery reduced output voltage arbitrary in claim 1 to 9 and charge and discharge protecting system, it is characterised in that: institute
State a kind of lithium battery reduced output voltage and its output voltage of charge-discharge protection circuit is 1.5V.
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| CN105762892A (en) * | 2016-04-28 | 2016-07-13 | 西安航天民芯科技有限公司 | Step-down output and charging and discharging protection system for lithium battery |
| CN106602645A (en) * | 2016-12-13 | 2017-04-26 | 上海创功通讯技术有限公司 | Charger |
| CN106953297A (en) * | 2017-05-26 | 2017-07-14 | 青岛东软载波科技股份有限公司 | A kind of protection circuit |
| CN107046311A (en) * | 2017-03-30 | 2017-08-15 | 华电电力科学研究院 | A kind of Wind turbines become the charge circuit and its control method of oar super capacitor internal resistance compensation |
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