CN201307773Y - Energy-saving control circuit of lithium ion battery - Google Patents

Energy-saving control circuit of lithium ion battery Download PDF

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Publication number
CN201307773Y
CN201307773Y CNU2008201686668U CN200820168666U CN201307773Y CN 201307773 Y CN201307773 Y CN 201307773Y CN U2008201686668 U CNU2008201686668 U CN U2008201686668U CN 200820168666 U CN200820168666 U CN 200820168666U CN 201307773 Y CN201307773 Y CN 201307773Y
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CN
China
Prior art keywords
circuit
resistance
operational amplifier
microprocessor
current
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Expired - Fee Related
Application number
CNU2008201686668U
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Chinese (zh)
Inventor
沈炜
刘文昊
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ZHEJIANG DONGGUAN RUIBAO TECHNOLOGY Co Ltd
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ZHEJIANG DONGGUAN RUIBAO TECHNOLOGY Co Ltd
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Priority to CNU2008201686668U priority Critical patent/CN201307773Y/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The utility model discloses an energy-saving control circuit of a lithium ion battery; the energy-saving control circuit of the lithium ion battery adopts the principle that a microprocessor is used for sampling charging and discharging current; when a charging and discharging circuit has no charging and discharging current, the microprocessor keeps or is in a sleep mode; and when the charging and discharging circuit has charging and discharging current, the microprocessor keeps in a working mode or wakes up automatically to enter into the working mode. The energy-saving control circuit comprises an over-charge and over-discharge protection circuit, and is characterized in that a current-to-voltage converter circuit, an absolute value circuit, a voltage comparator, an amplifying circuit, a clamping circuit and a microprocessor are arranged; the over-charge and over-discharge protection circuit is connected with the current-to-voltage converter circuit; the current-to-voltage converter circuit is connected with the absolute value circuit; the absolute value circuit is connected with the voltage comparator; the voltage comparator is connected with the amplifying circuit; and the amplifying circuit is connected with the microprocessor through the clamping circuit. The energy-saving control circuit adopts the sleep mode of the microprocessor to construct a current-based wake-up circuit, the power consumption is greatly reduced, thereby prolonging the self-discharge period of the lithium ion battery.

Description

The lithium ion battery energy-saving control circuit
Technical field:
The utility model relates to a kind of lithium ion battery energy-saving control circuit, and it is applicable to the lithium ionic battery protection circuit based on microprocessor.
Background technology:
Compare the battery of other types, lithium ion battery has numerous outstanding advantages, mainly contains high-energy-density, high voltage, and the discharge rate characteristic is good, and memory-less effect is pollution-free etc.Because lithium ion battery has good characteristic, obtained using widely.But lithium ion battery also has corresponding weakness, overcharging, crossing under the situation of putting, easily battery is caused damage, and under extreme case, as the danger that short circuit happens occasionally and explodes, therefore, lithium ion battery must be protected.The main purpose of protection has 3: prevent to overcharge, cross and put and short circuit, in addition, also will prevent lithium ion battery at work, temperature can not surpass a specific threshold value.(lithium ion battery adds that the integral body of protective circuit is called lithium ion battery herein, and simple lithium ion battery is called electric core by saying in the industry).
Mainly contain three classes at the resist technology that uses at present: a class is based on the assembled scheme of special protection chip, and second class is based on the scheme of analog switching circuit, and the 3rd class is based on the protective circuit scheme of general purpose microprocessor.
Assembled scheme based on special protection chip derives from the lithium ion battery protection scheme that is used for notebook computer.This scheme comparative maturity aspect laptop computer applications, many companies have also released comparatively outstanding Lithium-ion Battery Management IC, as MITUSUMI, Seiko, Microchip, TexasInstruments, Maxim-Dallas, 02Micro or the like.Because the voltage that notebook computer requires is not high, is no more than 14.4V, so the compound mode of 4 groups of (electric core) series connection of the general maximum uses of using of lithium ion battery, therefore single protection chip can only be managed 4 electric cores at most; And notebook is also little with the operating current of lithium ion battery, generally is no more than 5A.Therefore this scheme is difficult to be applied to the many occasions of electric core quantity.
Scheme based on analog switching circuit is a kind of rudimentary realization.It is not too big that this scheme can only be applied in electric current, the occasion that voltage is not too high, because analog circuit is difficult to realize accurate control, and also imperfection of the defencive function of each side, as equalization function; In addition, this scheme is also bigger from power consumption.
Scheme based on microprocessor is the expansion of first kind of scheme, and this scheme generally adopts general purpose microprocessor, as SOC chips such as PIC, auspicious Sas.This scheme is integrated mini system in the SoC chip, can embed specific object code, thereby realize specific controlled function, therefore can realize managing the function of the various aspects of electric core, and can reduce the size and the cost of product significantly.Simultaneously, in this scheme, SoC is used to manage peripheral circuit, and therefore, the SoC chip does not need directly to face high voltage, big electric current, and only need handle the signal that peripheral circuit transmits, thereby realizes flexible and efficient control.At last, because the autgmentability of SOC, make same SOC chip, can manage multiple electric core compound mode, and not need to redesign circuit.These all are the advantages of this scheme.
But; scheme based on microprocessor has a problem; microprocessor is when protecting; must be in running order; even when battery is not in running order, under these circumstances, the microprocessor power consumption is bigger; consume the electric energy of electric core, preserve trimestral requirement thereby be difficult to satisfy lithium battery half electric weight.
The utility model content:
Technical problem to be solved in the utility model is to overcome existing above-mentioned deficiency in the prior art, and a kind of low in energy consumption, lithium ion battery energy-saving control circuit based on microprocessor of prolonging the lithium ion battery self discharge cycle is provided.
The technical scheme in the invention for solving the above technical problem is: this lithium ion battery energy-saving control circuit; comprise the super-charge super-discharge protective circuit; it is characterized in that also being provided with current-to-voltage converting circuit, absolute value circuit, voltage comparator, amplifying circuit, clamp circuit and microprocessor; the super-charge super-discharge protective circuit is connected with current-to-voltage converting circuit; current-to-voltage converting circuit is connected with absolute value circuit; absolute value circuit is connected with voltage comparator; voltage comparator is connected with amplifying circuit, and amplifying circuit is connected with microprocessor by clamp circuit.
Current-to-voltage converting circuit described in the utility model comprises the tenth resistance, the 9th resistance, second electric capacity, first electric capacity, the 8th resistance, four-operational amplifier, the 9th resistance one end ground connection, and the other end inserts the reverse input end of four-operational amplifier; The tenth resistance one end is connected with the super-charge super-discharge protective circuit, and the other end inserts the input in the same way of four-operational amplifier; Second electric capacity, one end ground connection, the other end is connected with the tenth resistance; Be connected across between the reverse input end and output of four-operational amplifier after first electric capacity and the 8th resistance parallel connection, the four-operational amplifier output is connected with absolute value circuit.
Absolute value circuit described in the utility model comprises the 6th resistance, the 5th resistance, the 7th resistance, first diode, second diode and the 3rd operational amplifier, the 6th resistance one end is connected with the output of current-to-voltage converting circuit, and the other end inserts the reverse input end of the 3rd operational amplifier; The 7th resistance one end ground connection, the other end inserts the input in the same way of the 3rd operational amplifier; The 5th resistance is connected across between the input in the same way and output of the 3rd operational amplifier; The anode of first diode is connected on the output of the 3rd operational amplifier, and first diode cathode connects voltage comparator; The anode of second diode connects the current-to-voltage converting circuit output, and second diode cathode is connected with voltage comparator.
Voltage comparator described in the utility model comprises the 3rd resistance, the 4th resistance, power supply and second operational amplifier, and the output of absolute value circuit inserts the reverse input end of second operational amplifier; The 3rd resistance one end ground connection, the other end inserts the input in the same way of second operational amplifier; The 4th resistance one termination is gone into power supply, and the other end inserts the input in the same way of second operational amplifier, the output termination amplifying circuit of second operational amplifier.
Amplifying circuit described in the utility model comprises first resistance, second resistance and first operational amplifier, and voltage comparator output connects the input in the same way of first operational amplifier; Second resistance, one end ground connection, the reverse input end of the other end and first resistance and first operational amplifier joins; First resistance is connected across between the output of the reverse input end of first operational amplifier and first operational amplifier, and first operational amplifier output terminal connects clamp circuit, microprocessor.
Clamp circuit described in the utility model comprises clamping diode, and the clamping diode anode is connected with amplifying circuit, microprocessor, and the clamping diode negative electrode is connected with power supply.
Microprocessor described in the utility model adopts PIC16F887.
The utility model utilizes the park mode of microprocessor, and constructed the wake-up circuit based on electric current, needs voltage signal to wake up and the problem that is difficult to use in lithium ionic battery protection circuit thereby solved microprocessor.Because microprocessor can dormancy, power consumption reduces greatly, thereby has prolonged the lithium ion battery self discharge cycle.
Description of drawings:
Fig. 1 is the structural representation of the utility model embodiment.
Embodiment:
The utility model embodiment lithium ion battery energy-saving control circuit operation principle is:
Microprocessor 2 is connected with the charge-discharge circuit of lithium ion battery and the charging and discharging currents of sampling at any time, and (charging and discharging currents continues setting-up time and is lower than the charging and discharging currents lower threshold) microprocessor 2 did not keep or places park mode when charge-discharge circuit had charging and discharging currents; (charging and discharging currents continues setting-up time and is in the charging and discharging currents threshold values scope) microprocessor 2 kept or wakes up automatically entering mode of operation when charge-discharge circuit had charging and discharging currents.The threshold values of charging and discharging currents can be set according to situations such as actual battery capacity, quantity, model, loads.Present embodiment adopts charging and discharging currents to continue 1000 milliseconds when being lower than the charging and discharging currents lower threshold, if microprocessor 2 is in park mode and then keeps, if microprocessor 2 is in mode of operation, then carries out the SLEEP instruction, and microprocessor 2 is placed park mode; Charging and discharging currents continues 1000 milliseconds when being in the charging and discharging currents threshold values scope, if microprocessor 2 is in mode of operation and then keeps, if microprocessor 2 is in park mode, then microprocessor 2 wakes up automatically and enters mode of operation.
The utility model embodiment lithium ion battery energy-saving control circuit comprises the super-charge super-discharge protective circuit; it is characterized in that also being provided with current-to-voltage converting circuit, absolute value circuit, voltage comparator, amplifying circuit, clamp circuit and microprocessor 2; the super-charge super-discharge protective circuit is connected with current-to-voltage converting circuit; current-to-voltage converting circuit is connected with absolute value circuit; absolute value circuit is connected with voltage comparator; voltage comparator is connected with amplifying circuit, and amplifying circuit is connected with microprocessor 2 by clamp circuit.
The super-charge super-discharge protective circuit of the utility model embodiment is made up of a N type field effect transistor 25, the 2nd N type field effect transistor 26, first Schottky diode 23, second Schottky diode 24 and current sampling resistor 22; the one N type field effect transistor 25 was to put protection MOSFET; the 2nd N type field effect transistor 26 is over-charge protective MOSFET; current sampling resistor 22 is connected with electric core 1 negative pole; electricity core 1 positive pole meets lithium ion battery control end P2; the 2nd N type field effect transistor 26 source electrodes meet lithium ion battery control end P1, and the super-charge super-discharge protective circuit is a prior art.Power supply VCC is generally+5V, and signal ground SGND connects electric core 1 housing.
The current-to-voltage converting circuit of the utility model embodiment comprises the tenth resistance 21, the 9th resistance 19, second electric capacity 20, first electric capacity 17, resistance 18, four-operational amplifier 16, the 9th resistance 19 1 end ground connection, the other end inserts the reverse input end of four-operational amplifier 16; The tenth resistance 21 1 ends are connected with the super-charge super-discharge protective circuit, and the other end inserts the input in the same way of four-operational amplifier 16; Second electric capacity, 20 1 end ground connection, the other end is connected with the tenth resistance 21; Be connected across between the reverse input end and output of four-operational amplifier 16 after first electric capacity 17 and 18 parallel connections of the 8th resistance, four-operational amplifier 16 outputs are connected with absolute value circuit.
The absolute value circuit of the utility model embodiment comprises the 6th resistance 14, the 5th resistance 11, the 7th resistance 15, first diode 10, second diode 13 and the 3rd operational amplifier 12, the 6th resistance 14 1 ends are connected with the output of current-to-voltage converting circuit, and the other end inserts the reverse input end of the 3rd operational amplifier 12; The 7th resistance 15 1 end ground connection, the other end inserts the input in the same way of the 3rd operational amplifier 12; The 5th resistance 11 is connected across between the input in the same way and output of the 3rd operational amplifier 12; The anode of first diode 10 is connected on the output of the 3rd operational amplifier 12, and first diode, 10 negative electrodes connect voltage comparator; The anode of second diode 13 connects the current-to-voltage converting circuit output, and second diode, 13 negative electrodes are connected with voltage comparator.
The voltage comparator of the utility model embodiment comprises the 3rd resistance 8, the 4th resistance 9, power supply VCC and second operational amplifier 7, and the output of absolute value circuit inserts the reverse input end of second operational amplifier 7, as input signal; The 3rd resistance 8 one end ground connection, the other end inserts the input in the same way of second operational amplifier 7; The 4th resistance 9 one terminations are gone into power supply VCC, and the other end inserts the input in the same way of second operational amplifier 7, and the negative electrode of output termination amplifying circuit first diode 10 of second operational amplifier 7 is the output of absolute value circuit.And the network of the 3rd resistance 8, the 4th resistance 9 and power supply VCC has been formed the reference voltage of voltage comparator.
The amplifying circuit of the utility model embodiment comprises that first resistance 5, second resistance 6 and 7 outputs of first operational amplifier, 4, the second operational amplifiers connect the input in the same way of first operational amplifier 4; Second resistance, 6 one end ground connection, the reverse input end of the other end and first resistance 5 and first operational amplifier 4 joins; First resistance 5 is connected across between the output of the reverse input end of first operational amplifier 4 and first operational amplifier 4, first operational amplifier, 4 output termination clamp circuits, microprocessor 2.
The clamp circuit of the utility model embodiment comprises clamping diode 3, and clamping diode 3 positive poles are connected with microprocessor 2 with the output of amplifying circuit first operational amplifier 4, and clamping diode 3 negative poles are connected with power supply VCC.Last signal after treatment inserts the port RB5 mouth of microprocessor 2 (PIC16F887).
Implementation method is:
When the lasting setting-up time of lithium ion battery is lower than the charging and discharging currents threshold values, if microprocessor 2 is in park mode and then keeps,, then carry out the SLEEP instruction if microprocessor 2 is in mode of operation, microprocessor 2 is placed park mode.At this moment, master oscillator quits work, and the chip consumed current is extremely low, approximately has only several microamperes, thereby greatly reduces the power consumption of microprocessor 2.In case after lithium ion cell charging or the discharge, the loop produces electric current, when lasting setting-up time entered in the charging and discharging currents threshold values scope, microprocessor 2 woke up automatically, the execute protection function.The dormancy awakening of microprocessor 2 adopts the RB5 pin state variation of PIC16F887 to interrupt realizing.Triggering signal is from the voltage of the current signal in the charge-discharge circuit after the current-to-voltage converting circuit conversion.When lithium ion battery was not worked, the loop did not have electric current to flow through, and the RB5 pin of PIC16F887 is input as low level; When lithium ion battery transferred operating state to by off position, the loop produced electric current, and the port RB5 pin input of PIC16F887 becomes high level by low level, the pin state variation takes place interrupt, and microprocessor PIC16F887 is waken up.In the current-to-voltage converting circuit selection of the 8th resistance 18, the 9th resistance 19 to guarantee lithium ion battery charge normal or discharge scenario under voltage after the conversion both be less than the short circuit reference voltage (the 3rd resistance 8, the 4th resistance 9 and power supply VCC network form) of voltage comparator, satisfy the high level input requirement of the port RB5 of PIC16F887 again.In order to solve owing to the high-low level of the voltage that obtains behind the current sample that causes of loop current size and Orientation difference in discharge and the charging process with respect to the RB5 input pin of PIC16F887 differs, here utilize absolute value circuit that the sampled voltage that current-to-voltage converting circuit obtains is taken absolute value earlier, thereby obtain unified positive voltage.Cause that circuit produces mistake and interrupts wake operation when preventing short circuit, here designed a voltage comparator module, because loop circuit was several times when loop current will exceed the lithium ion battery operate as normal during short circuit, when producing short circuit, the reverse input end voltage of voltage comparator is higher than the short circuit reference voltage, the voltage comparator output low level, the port RB5 pin state of PIC16F887 does not change, and does not produce to interrupt waking up; When lithium ion battery transferred normal operating conditions to by off position, the reverse input end voltage of voltage comparator was lower than the short circuit reference voltage, voltage comparator output high level.Utilize operational amplifier that the signal through voltage comparator output is carried out processing and amplifying then, purpose is for the small voltage signal of little current signal through being converted to being brought up to the high level requirement of the RB5 pin of PIC16F887.In order to protect the pin of PIC16F887, add clamping diode circuit at the port RB5 of PIC16F887 pin.

Claims (7)

1, a kind of lithium ion battery energy-saving control circuit; comprise the super-charge super-discharge protective circuit; it is characterized in that: also be provided with current-to-voltage converting circuit, absolute value circuit, voltage comparator, amplifying circuit, clamp circuit and microprocessor; the super-charge super-discharge protective circuit is connected with current-to-voltage converting circuit; current-to-voltage converting circuit is connected with absolute value circuit; absolute value circuit is connected with voltage comparator; voltage comparator is connected with amplifying circuit, and amplifying circuit is connected with microprocessor by clamp circuit.
2, energy-saving control circuit according to claim 1, it is characterized in that: described current-to-voltage converting circuit comprises the tenth resistance, the 9th resistance, second electric capacity, first electric capacity, the 8th resistance, four-operational amplifier, the 9th resistance one end ground connection, the other end inserts the reverse input end of four-operational amplifier; The tenth resistance one end is connected with the super-charge super-discharge protective circuit, and the other end inserts the input in the same way of four-operational amplifier; Second electric capacity, one end ground connection, the other end is connected with the tenth resistance; Be connected across between the reverse input end and output of four-operational amplifier after first electric capacity and the 8th resistance parallel connection, the four-operational amplifier output is connected with absolute value circuit.
3, energy-saving control circuit according to claim 1, it is characterized in that: described absolute value circuit comprises the 6th resistance, the 5th resistance, the 7th resistance, first diode, second diode and the 3rd operational amplifier, the 6th resistance one end is connected with the output of current-to-voltage converting circuit, and the other end inserts the reverse input end of the 3rd operational amplifier; The 7th resistance one end ground connection, the other end inserts the input in the same way of the 3rd operational amplifier; The 5th resistance is connected across between the input in the same way and output of the 3rd operational amplifier; The anode of first diode is connected on the output of the 3rd operational amplifier, and first diode cathode connects voltage comparator; The anode of second diode connects the current-to-voltage converting circuit output, and second diode cathode is connected with voltage comparator.
4, energy-saving control circuit according to claim 1 is characterized in that: described voltage comparator comprises the 3rd resistance, the 4th resistance, power supply and second operational amplifier, and the output of absolute value circuit inserts the reverse input end of second operational amplifier; The 3rd resistance one end ground connection, the other end inserts the input in the same way of second operational amplifier; The 4th resistance one termination is gone into power supply, and the other end inserts the input in the same way of second operational amplifier, the output termination amplifying circuit of second operational amplifier.
5, energy-saving control circuit according to claim 1 is characterized in that: described amplifying circuit comprises first resistance, second resistance and first operational amplifier, and voltage comparator output connects the input in the same way of first operational amplifier; Second resistance, one end ground connection, the reverse input end of the other end and first resistance and first operational amplifier joins; First resistance is connected across between the output of the reverse input end of first operational amplifier and first operational amplifier, and first operational amplifier output terminal connects clamp circuit, microprocessor.
6, energy-saving control circuit according to claim 1 is characterized in that: described clamp circuit comprises clamping diode, and the clamping diode anode is connected with amplifying circuit, microprocessor, and the clamping diode negative electrode is connected with power supply.
7, energy-saving control circuit according to claim 1 is characterized in that: described microprocessor adopts PIC16F887.
CNU2008201686668U 2008-11-25 2008-11-25 Energy-saving control circuit of lithium ion battery Expired - Fee Related CN201307773Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2008201686668U CN201307773Y (en) 2008-11-25 2008-11-25 Energy-saving control circuit of lithium ion battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2008201686668U CN201307773Y (en) 2008-11-25 2008-11-25 Energy-saving control circuit of lithium ion battery

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102214846A (en) * 2010-04-09 2011-10-12 欣旺达电子股份有限公司 Method for reducing consumption of battery management system and low-consumption battery management system
WO2019210678A1 (en) * 2018-05-04 2019-11-07 深圳市道通智能航空技术有限公司 Battery power consumption control method and apparatus, and unmanned aerial vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102214846A (en) * 2010-04-09 2011-10-12 欣旺达电子股份有限公司 Method for reducing consumption of battery management system and low-consumption battery management system
WO2019210678A1 (en) * 2018-05-04 2019-11-07 深圳市道通智能航空技术有限公司 Battery power consumption control method and apparatus, and unmanned aerial vehicle

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GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20090909

Termination date: 20111125