CN105790358A - Battery charging circuit - Google Patents
Battery charging circuit Download PDFInfo
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- CN105790358A CN105790358A CN201610217776.8A CN201610217776A CN105790358A CN 105790358 A CN105790358 A CN 105790358A CN 201610217776 A CN201610217776 A CN 201610217776A CN 105790358 A CN105790358 A CN 105790358A
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- 238000001514 detection method Methods 0.000 claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 7
- 238000005297 material degradation process Methods 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 15
- 229910052744 lithium Inorganic materials 0.000 description 15
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910010710 LiFePO Inorganic materials 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
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- H02J7/0072—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- H02J7/0026—
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- 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
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- 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
- H02J7/00302—Overcharge protection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of charging, particularly to a battery charging circuit comprising an input unit, a battery, an output unit, a voltage conversion unit, a current/voltage detection unit, and a charging control unit. The output unit connected with the battery electrically is used for providing the charging power for the battery. The voltage conversion unit connected with the input unit electrically is used for providing the power from the input unit for the output unit to charge the battery. The current/voltage detection unit connected with the output unit electrically is used for detecting a charging voltage value and a charging current value of the output unit. And the charging control unit with the input terminal connected with the current/voltage detection unit electrically and the output terminal connected with the output unit electrically is used for adjusting the power outputted by the output unit to the battery according to the inputted charging voltage value and the charging current value. The safe and reliable charging power can be provided for the battery; the battery is not in a high voltage or heavy current state for long time during the charging process and the battery material degradation of the battery can be reduced; and the service life of the battery can be prolonged.
Description
[technical field]
The present invention relates to charging technique field, concrete, relate to a kind of battery charger.
[background technology]
Lithium battery owing to having energy density height, have extended cycle life, the advantage such as lightweight, therefore quickly just obtain extensive use in portable.
In lithium battery use procedure, it is often necessary to use lithium battery charger that lithium battery is charged, but periphery is protected circuit requirement high by lithium battery, can not use large current charge when lithium battery voltage is very low, can shorten the service life of battery；And at battery palpus constant-voltage charge in time protecting voltage, otherwise easily overcharge, it is desirable to charging current is adjusted according to the voltage of lithium battery.
But existing lithium battery charging circuit can not adjust charging current automatically according to the voltage of lithium battery, it is susceptible to the situation that during lithium battery low-voltage, charging current is excessive, and shorten the service life of battery, and it may also happen that lithium battery overcharges, lithium battery temperature is too high situation, lithium battery is damaged, even can cause the potential safety hazards such as fire.
[summary of the invention]
The purpose of the present invention aims to solve the problem that any one problem above-mentioned, it is provided that a kind of battery charger.
For realizing this purpose, the present invention adopts the following technical scheme that
The invention provides a kind of battery charger, it includes input block and battery, also includes:
Output unit, electrically connects described battery, for providing rechargeable electrical energy for this battery；
Voltage conversion unit, electrically connects described input block, is the charging of described battery for the electric energy of input block is supplied to output unit；
Current/voltage detection unit, electrically connects described output unit, for detecting charging voltage value and the charging current value of output unit；
Charging control unit, its input electrically connects described current/voltage detection unit, and its outfan electrically connects described output unit, for described charging voltage value and the described charging current value of foundation input, adjusts described output unit and exports the electric energy of described battery.
Further, described circuit also includes input protected location,
Described input protected location, electrically connects described input block, for detecting magnitude of voltage that this input block inputs and this magnitude of voltage being fed back to described charging control unit.
Concrete, disclosed according to one embodiment of this programme, described input protected location includes input voltage measurement unit and the first divider resistance being serially connected and the second divider resistance,
The input of described input voltage measurement unit electrically connects described first divider resistance and the common port of the second divider resistance series connection, outfan electrically connect described charging control unit.
Optionally, disclosed according to this programme embodiment, described input voltage measurement unit includes the first error amplifier and first comparator of series connection, and the outfan of the first error amplifier electrically connects a wherein input of this first comparator；
The common port of described first divider resistance and the series connection of the second divider resistance electrically connects a wherein input of this first error amplifier；The outfan of described first comparator electrically connects described charging control unit.
Further, described circuit also includes battery temperature protected location,
Described battery temperature protected location, electrically connects described output unit, for detecting the current temperature of described battery and battery Current Temperatures being fed back to described charging control unit.
Concrete; described battery temperature protected location includes temperature detecting unit and attached critesistor on the battery; one end ground connection of described critesistor, the other end electrically connect described temperature detecting unit, and the outfan of this temperature detecting unit electrically connects described charging control unit.
Concrete, described temperature detecting unit includes the second error amplifier and second comparator of series connection, and the outfan of the second error amplifier electrically connects a wherein input of this second comparator；
The other end of described critesistor electrically connects a wherein input of this second error amplifier；The outfan of described second comparator electrically connects described charging control unit.
Further, described charging control unit also includes logic control element,
Described logic control element, electrically connects described charging control unit and output unit, and the control signal for receiving charging control unit output produces to drive signal, to drive the described output unit of control to export the electric energy of described battery.
Optionally, described driving signal is pulse-width signal.
Concrete, described output unit includes the first switching tube, second switch pipe and detection resistance；
The grid of described first switching tube electrically connects described charging control unit, drain electrode the electrical connection base stage of described second switch pipe, source electrode electrically；
The base stage electrical connection drain electrode of described first switching tube of described second switch pipe, emitter-base bandgap grading electrically connect one end of the positive input terminal of described input block, the colelctor electrode described detection resistance of electrical connection；
The other end of described detection resistance electrically connects the positive pole of described battery.
Concrete, described first switching tube is field effect transistor.
Concrete, described second switch pipe is audion.
Optionally, described voltage dress changes circuit is dc-dc boost circuit.
Compared with prior art, the present invention possesses following advantage:
1, the battery charger described in the present invention program, include charging voltage value and the charging current value that can detect output unit in real time, and adjust described output unit according to this charging voltage value and charging current value and export the electric energy of described battery, thus provide safe and reliable rechargeable electrical energy for battery；Make will not be in higher voltage or big electric current in charging process for a long time, the deterioration of electrode material in battery can be alleviated；Thus the service life of prolongation battery, improve the safety of battery；
2, further, charging circuit of the present invention also includes input protected location, for the magnitude of voltage that input block in testing circuit inputs, and this magnitude of voltage is fed back to described charging control unit exports the electric energy of battery to regulate output unit；Namely prevent this circuit because input voltage too high and damage, extend the service life of battery, improve the safety of charging circuit；
3, further; charging circuit of the present invention also includes battery temperature protected location; the temperature of battery is detected by critesistor; and by battery temperature feedback of status to charging control unit; thus controlling output unit to be input to the electric energy of battery; prevent the heat that battery produces in charging process from can battery be caused damage, extend the life-span of battery further, improve the safety that battery uses.
Aspect and advantage that the present invention adds will part provide in the following description, and these will become apparent from the description below, or is recognized by the embodiment of this programme.
[accompanying drawing explanation]
In order to be illustrated more clearly that the technical scheme in the embodiment of the present invention, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, it should be evident that the accompanying drawing in the following describes is only some embodiments of the present invention, but the invention is not restricted to this.
Fig. 1 is the structural representation in an embodiment of a kind of battery charger of the present invention；
Fig. 2 is the structural representation in an embodiment of a kind of battery charger of the present invention；
Fig. 3 is the structural representation in an embodiment of a kind of battery charger of the present invention.
[detailed description of the invention]
Below in conjunction with accompanying drawing and exemplary embodiment, the present invention being further described, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of same or like function from start to finish.The embodiment described below with reference to accompanying drawing is illustrative of, and is only used for explaining the present invention, and is not construed as limiting the claims.Additionally, if it is known that the detailed description of technology the invention is characterized in that unnecessary for illustrating, then omitted.
Those skilled in the art of the present technique are appreciated that unless expressly stated, and singulative used herein " ", " one ", " described " and " being somebody's turn to do " may also comprise plural form.Should be further understood that, the wording " including " used in the description of the present invention refers to there is described feature, integer, step, operation, element and/or assembly, but it is not excluded that existence or adds other features one or more, integer, step, operation, element, assembly and/or their group.It should be understood that when we claim element to be " connected " or during " coupled " to another element, it can be directly connected or coupled to other elements, or can also there is intermediary element.Additionally, " connection " used herein or " coupling " can include wireless connections or wireless couple.Wording "and/or" used herein includes one or more list the whole of item or any cell being associated and combines with whole.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, and all terms used herein (include technical term and scientific terminology), have with the those of ordinary skill in art of the present invention be commonly understood by identical meaning.It should also be understood that, those terms of definition in such as general dictionary, should be understood that there is the meaning consistent with the meaning in the context of prior art, and unless by specific definitions as here, otherwise will not explain by idealization or excessively formal implication.
The detailed description of the invention of this programme is detailed below.
The invention provides a kind of battery charger, in the process that battery is charged, need the current voltage of battery is detected, certainly this detection can be real-time or be periodically detected, to determine that the different charging modes of employing is charged for this battery, thus while to quickly charging battery, without influence on the service life of battery, and heretofore described circuit adopts low-voltage, large current charge when battery is charged.
It should be noted that charging circuit of the present invention can apply to lithium battery, it is also possible to be applied to other kinds of battery；Further, in actual applications, set of cells is generally combined by one or more cells, it is possible to set of cells and cell are referred to as battery；Primary entity generally, due to charging is generally cell, so alleged battery is often referred to cell when not special indicating.
Concrete, refer to accompanying drawing 1, for the structural representation in an embodiment of a kind of battery charger of the present invention.Described circuit includes the input block, voltage conversion unit, output unit 30 and the battery VBAT that are sequentially connected with；Wherein said voltage conversion unit can be dc-dc boost circuit, and in an embodiment of this programme, described voltage conversion unit is DC-DCBUCK reduction voltage circuit, electrically connect described input block, DC voltage Vin for being inputted by input block drops to the appropriate voltage value that can charge for output unit 30, it is easy to output unit 30 and provides safe electric energy for battery VBAT, improve the safety of system.
Further; described charging circuit also includes input protected location 10 and charging control unit; described input protected location, electrically connects described input block, for detecting magnitude of voltage that this input block inputs and this magnitude of voltage being fed back to described charging control unit.This charging control unit controls output unit 30 output electric energy to battery VBAT according to according to the magnitude of voltage of the input obtained; realize input overvoltage protection; prevent this circuit because input voltage too high and damage, extend the service life of battery, improve the safety of charging circuit.
Concrete, referring to accompanying drawing 1, in one embodiment of the invention, described input protected location 10 includes input voltage measurement unit and the first divider resistance R1 being serially connected and the second divider resistance R2.nullIn described input block, the charging voltage Vin of input is after the dividing potential drop of the first divider resistance R1 and the second divider resistance R2，The common port of described first divider resistance R1 and the second divider resistance R2 series connection accesses the input of this voltage detection unit，The other end ground connection of the second divider resistance R2 again，The input of voltage detection unit it is linked into by the magnitude of voltage on this second divider resistance R2，Voltage detection unit is according to internal judgement，The input voltage parameter that will determine that out feeds back to described charging control unit again，Control, according to this voltage parameter, the electric energy that output unit is battery charging again by described charging control unit，When input voltage vin is beyond voltage range set in advance，Described charging control unit disconnects the electric energy that output unit 30 charges for battery，Prevent input voltage vin too high or too low and damage charging circuit or battery，Shorten the life-span of battery.
Concrete, refer to accompanying drawing 2, in one embodiment of the invention, described voltage detection unit includes the first error amplifier A1 and the first comparator B1 of series connection, and first the outfan of error amplifier A1 electrically connect the wherein input of this first comparator B1, be negative input end shown in Fig. 2, but be understood that, the outfan of described first error amplifier A1 can also electrically connect the positive input terminal of this first comparator B1, and this is not construed as limiting by the present embodiment.
nullConcrete，In one exemplary embodiment of the present invention，The public end of described first divider resistance R1 and the second divider resistance R2 series connection electrically connects a wherein input of this first error amplifier A1，And another input input of the first error amplifier A1 has the first default reference voltage Vref 1，The difference of the magnitude of voltage that its positive input terminal inputs is amplified with negative input end by the first error amplifier A1，This difference is input to a wherein input of the first comparator B1 again，An in like manner other input input of the first comparator B1 has the second default reference voltage Vref 2，By comparing the size between the first error approach device A1 difference exported and the second default reference voltage Vref 2，Again the outfan of this first comparator B1 is connected to this charging control unit，Judge that magnitude of voltage Vin that input block inputs is whether in default scope.It should be understood, of course, that, the value of described first reference voltage Vref 1 and the second reference voltage Vref 2 specifically can set according to the resistance of the concrete OK range of Vin and the first divider resistance R1 and the second divider resistance R2.
Further, refer to accompanying drawing 1, in one embodiment of the invention, described output unit 30 also includes the grid of the first switching tube Q1, second switch pipe Q2 and detection resistance R3, wherein said first switching tube Q1 and electrically connects described charging control unit, drain electrode the electrical connection base stage of described second switch pipe Q2, source electrode electrically；And the base stage electrical connection drain electrode of described first switching tube Q1 of described second switch pipe Q2, emitter-base bandgap grading electrically connect the positive input terminal in described input block, colelctor electrode electrically connects one end of described detection resistance R3, and the other end of described detection resistance R3 electrically connects the positive pole of described battery VBAT.And in an exemplary embodiment of this programme, described first switching tube Q1 is field effect transistor, described second switch pipe Q2 is audion.
Further, described circuit also includes current/voltage detection unit, and described current/voltage detection unit is connected to the two ends of detection resistance R3, charging current value and the charging voltage value of battery VBAT is arrived for detecting output unit 30 output, the negative pole of battery VBAT is connected to ground again, therefore the voltage that the detection of described current/voltage is detected by unit is the current voltage value of battery VBAT, and the outfan of described current/voltage detection unit is electrically connected with charging control unit, and then make charging control unit detect the charging voltage value detected by unit and charging current value according to this current/voltage, control output unit 30 output electric energy to battery VBAT.
Further, in one embodiment of the invention, described charging control unit also includes logic control element, namely the input of this logic control element electrically connects the outfan of described charging control unit, the outfan of this logic control element electrically connects the grid of described first switching tube Q1, produce to drive signal for receiving the control signal of described charging control unit output, thus driving the switching frequency of the first switching tube Q1, thus regulating the first switching tube Q1 average current value exported, and then by after the amplification of second switch pipe Q2, battery VBAT for being connected to the collector terminal of described second switch pipe Q2 charges, the driving signal of wherein said logic control element output can be pulse-width modulation PWM ripple signal.
Further, damaging battery owing to the charging temperature of battery is too high and be likely to set off an explosion, temperature is too low, is difficult to be full of battery.Therefore, the temperature of battery charging is controlled between 0-40 DEG C, if beyond this temperature range, just stop lithium cell charging.In this programme, described circuit also includes battery temperature protected location 20, this battery temperature protected location 20 electrically connects charging control unit and output unit 30, for detecting described temperature current for battery VBAT, and battery VBAT Current Temperatures is fed back to described charging control unit, it is easy to charging control unit and detects when battery Current Temperatures is overheated, by adjusting the dutycycle that logic control element exports the PWM ripple signal of the first switching tube Q1, reduce the average current size of the first switching tube Q1 output, thus reducing second switch pipe Q2 to export the electric energy on battery VBAT；nullCan even is that shutoff the first switching tube Q1，It is zero that the electric current that the drain electrode end of the first switching tube Q1 exports is situated between，Then the base voltage of second switch pipe Q2 is zero，Second switch pipe Q2 ends，Thus the collector terminal output electric current of second switch pipe Q2 is also almost nil，Stop the charging to battery VBAT，Until the temperature that battery temperature protected location 20 detects battery VBAT drops to zone of reasonableness，Improve the dutycycle that logic control element exports the PWM ripple signal of the first switching tube Q1 again，Increase the average current size of the first switching tube Q1 output，Thus increasing the second switch pipe Q2 charging current to battery VBAT，So circulation，Prevent the heat that battery produces in charging process from can battery be caused damage，Extend the life-span of battery further，Improve the safety that battery uses.
Concrete; referring to accompanying drawing 3; in one embodiment of the invention; described battery temperature protected location 20 includes temperature detecting unit and attached critesistor Rntc on the battery; one end ground connection of described critesistor Rntc; the other end connects the input of described temperature detecting unit, and temperature-sensitive battery Rntc is serially connected in the positive output end of input voltage vin also by the 3rd divider resistance R4.Described critesistor Rntc and the three divider resistance R4 constitutes potential-divider network, and the pressure drop on critesistor Rntc is fed back to temperature detecting unit.It can be appreciated that this embodiment make use of the feature that the resistance of critesistor Rntc varies with temperature, the change of battery VBAT temperature can be converted into the change in voltage on critesistor Rntc, namely can determine whether the state of battery VBAT temperature.
Concrete; refer to accompanying drawing 3; in one embodiment of the invention; described battery temperature protected location 20 includes the second error amplifier A2 and the second comparator B2 of series connection; and second the outfan of error amplifier A2 electrically connect the wherein input of this second comparator B2, be negative input end shown in Fig. 3, but be understood that; the outfan of described second error amplifier A2 can also electrically connect the positive input terminal of this second comparator B2, and this is not construed as limiting by the present embodiment.nullConcrete，In one exemplary embodiment of the present invention，One end of described critesistor Rntc electrically connects a wherein input of this second error amplifier A2，And another input input of the second error amplifier A2 has the 3rd default reference voltage Vref 3，The difference of the magnitude of voltage that its positive input terminal inputs is amplified with negative input end by the second error amplifier A2，This difference is input to a wherein input of the second comparator B2 again，An in like manner other input input of the second comparator B2 has the 4th default reference voltage Vref 4，By comparing the size between the second error approach device A2 difference and the 3rd default reference voltage Vref 3 exported，Again the outfan of this second comparator B2 is connected to this charging control unit，Judge that the magnitude of voltage of critesistor Rntc is whether in default safety range，Thus judging that the temperature of the critesistor Rntc battery VBAT detected is whether in safety range.It should be understood, of course, that, the value of described 3rd reference voltage Vref 3 and the 4th reference voltage Vref 4 specifically can set according to the resistance of the temperature range set and the 3rd divider resistance R4.
It should be noted that, this programme adopts described current/voltage detection unit, detect the current voltage value on the charging current value and battery VBAT that input on sampling resistor R3 in output unit 30, and then charging control unit controls logic control element and adjusts the electric energy that output unit 30 is input on battery VBAT, under the premise not affecting battery life, it is achieved the quick charge to battery.
Concrete, in one embodiment of the invention, before battery VBAT is charged, it needs to be determined that the charging cut-in voltage Vth1 applied when charging for battery VBAT, charging critical voltage Vth2 and charging restriction voltage Vth3, and this charging cut-in voltage Vth1 should be less than charging restriction voltage Vth3 less than charging critical voltage Vth2, charging critical voltage Vth2.Specifically, it is possible to determine charging cut-in voltage Vth1, charging critical voltage Vth2 and charging restriction voltage Vth3 previously according to battery parameters such as the capacity of battery VABT, maximum current, maximum voltages；Or according to battery operating parameter such as the electric current current for battery VBAT obtained, voltages, and charging cut-in voltage Vth1, charging critical voltage Vth2 and charging restriction voltage Vth3 can be calculated according to the above-mentioned battery operating parameter obtained.Positive electrode LiFePO conventional at present4The charging critical voltage of class can be 3.550V or 3.450V, the non-LiFePO of positive electrode4The charging critical voltage of class can be 4.1V or 4.0V.
Concrete, refer to accompanying drawing 1, in one exemplary embodiment of the present invention, when battery VBAT is charged, the current voltage value of battery VBAT is obtained by described measure voltage & current unit, when this cell voltage is less than described charging cut-in voltage Vth1, charging control unit controls the open frequency of the first switching tube Q1 by described logic control element, again through second switch pipe Q2, battery VBAT is carried out trickle charge, in one exemplary embodiment of the present invention, described charging cut-in voltage Vth1=2.2.V；Further, when battery VBAT voltage is more than charging cut-in voltage Vth1, this battery VBAT is carried out constant-current charge, adopting a constant big electric current is that battery VBAT carries out quick charge, in one exemplary embodiment of the present invention, during for battery VBAT constant-current charge, the current value adopted can reach 1.5A；Until when current/voltage detection unit detects battery VBAT current voltage more than charging critical voltage Vth2, keep charging voltage constant by Isobarically Control, namely described charging control unit regulates the dutycycle of the PWM ripple of described logic control element output, control the switching frequency of the first switching tube Q1, and then keep constant voltage to be added in the two ends of battery VBAT, carrying out along with charging process, the ion concentration of the positive pole of battery VBAT is more and more less, diffusion velocity gradually decreases, and electric current is gradually reduced battery electric quantity the most at last and is full of；Certainly; in order to avoid the impact overcharged on the battery VBAT life-span; when current/voltage detection unit detects the voltage at battery two ends more than charging restriction voltage Vth3; the level of described logic control element output is regulated by described charging control unit; so that the drain electrode end output voltage of the first switching tube Q1 is close to zero; and then second switch pipe Q2 is ended, stop charging for described battery VBAT, it is achieved over-charging of battery is protected.
In sum, battery charger described in the present invention program, include charging voltage value and the charging current value that can detect output unit in real time, and adjust described output unit according to this charging voltage value and charging current value and export the electric energy of described battery, ensureing while quick charge, safe and reliable rechargeable electrical energy can provided for battery；Make will not be in higher voltage or big electric current in charging process for a long time, the deterioration of electrode material in battery can be alleviated；Thus the service life of prolongation battery, improve the safety of battery
In description mentioned herein, although describe substantial amounts of detail.It is to be appreciated, however, that embodiments of the invention can be put into practice when not having these details.In certain embodiments, known method, structure and technology it are not shown specifically, in order to do not obscure the understanding of this description.
Although having been illustrated with some exemplary embodiments of the present invention above, but it should be appreciated by those skilled in the art that, when without departing from principles of the invention or spirit, it is possible to these exemplary embodiments are made a change, the scope of the present invention is limited by claim and equivalent thereof.
Claims (10)
1. a battery charger, it includes input block and battery, it is characterised in that described charging circuit also includes:
Output unit, electrically connects described battery, for providing rechargeable electrical energy for this battery；
Voltage conversion unit, electrically connects described input block, is the charging of described battery for the electric energy of input block is supplied to output unit；
Current/voltage detection unit, electrically connects described output unit, for detecting charging voltage value and the charging current value of output unit；
Charging control unit, its input electrically connects described current/voltage detection unit, and its outfan electrically connects described output unit, for described charging voltage value and the described charging current value of foundation input, adjusts described output unit and exports the electric energy of described battery.
2. circuit according to claim 1, it is characterised in that: also include input protected location,
Described input protected location, electrically connects described input block, for detecting magnitude of voltage that this input block inputs and this magnitude of voltage being fed back to described charging control unit.
3. circuit according to claim 2, it is characterised in that: described input protected location includes input voltage measurement unit and the first divider resistance being serially connected and the second divider resistance,
The input of described input voltage measurement unit electrically connects described first divider resistance and the common port of the second divider resistance series connection, outfan electrically connect described charging control unit.
4. circuit according to claim 3, it is characterised in that: described input voltage measurement unit includes the first error amplifier and first comparator of series connection, and the outfan of the first error amplifier electrically connects a wherein input of this first comparator；
The common port of described first divider resistance and the series connection of the second divider resistance electrically connects a wherein input of this first error amplifier；The outfan of described first comparator electrically connects described charging control unit.
5. circuit according to claim 1, it is characterised in that: also include battery temperature protected location,
Described battery temperature protected location, electrically connects described output unit, for detecting the current temperature of described battery and battery Current Temperatures being fed back to described charging control unit.
6. circuit according to claim 5; it is characterized in that: described battery temperature protected location includes temperature detecting unit and attached critesistor on the battery; one end ground connection of described critesistor, the other end electrically connect described temperature detecting unit, and the outfan of this temperature detecting unit electrically connects described charging control unit.
7. circuit according to claim 6, it is characterised in that: described temperature detecting unit includes the second error amplifier and second comparator of series connection, and the outfan of the second error amplifier electrically connects a wherein input of this second comparator；
The other end of described critesistor electrically connects a wherein input of this second error amplifier；The outfan of described second comparator electrically connects described charging control unit.
8. circuit according to claim 1, it is characterised in that: described charging control unit also includes logic control element,
Described logic control element, electrically connects described charging control unit and output unit, and the control signal for receiving charging control unit output produces to drive signal, to drive the described output unit of control to export the electric energy of described battery.
9. circuit according to claim 8, it is characterised in that: described driving signal is pulse-width signal.
10. circuit according to claim 1, it is characterised in that: described output unit includes the first switching tube, second switch pipe and detection resistance；
The grid of described first switching tube electrically connects described charging control unit, drain electrode the electrical connection base stage of described second switch pipe, source electrode electrically；
The base stage electrical connection drain electrode of described first switching tube of described second switch pipe, emitter-base bandgap grading electrically connect one end of the positive input terminal of described input block, the colelctor electrode described detection resistance of electrical connection；
The other end of described detection resistance electrically connects the positive pole of described battery.
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