CN102195321B - Intelligent load distribution circuit of lithium battery power - Google Patents
Intelligent load distribution circuit of lithium battery power Download PDFInfo
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- CN102195321B CN102195321B CN 201110088362 CN201110088362A CN102195321B CN 102195321 B CN102195321 B CN 102195321B CN 201110088362 CN201110088362 CN 201110088362 CN 201110088362 A CN201110088362 A CN 201110088362A CN 102195321 B CN102195321 B CN 102195321B
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Abstract
The invention relates to an intelligent load distribution circuit of a lithium battery power, comprising a power detection circuit, a power pretreatment circuit, a battery temperature detection circuit, a general logic control circuit, a charged CCCV (constant current constant voltage) controller and other analog circuit parts, a current balance function module, a battery voltage and system voltage detection comparator and a supplying circuit of reference voltage and reference current, wherein a positive pole of the power detection circuit is connected with an output end of the power pretreatment circuit; an output end of the battery temperature detection circuit is connected with the general logic control circuit; the general logic control circuit, the charged CCCV (constant current constant voltage) controller and other analog circuit parts and the current balance function module are in cross connection; and the current balance function module is connected with the supplying circuit of reference voltage and reference current. The intelligent load distribution circuit has the beneficial effect that the voltage detection and the current control of a system in an analog method are added in the charging circuit, thus ensuring that the batteries can still meet a heavy-duty current demand of the system when the batteries are charged in a low-voltage state.
Description
Technical field
The present invention relates to a kind of charging technique field, relate in particular to a kind of intelligent load distributor circuit of lithium battery power supply.
Background technology
Lithium battery is because its energy density height is the ideal battery of present main flow handheld device always.But the lithium battery surcharge causes cell expansion even blast easily.So can be fast, safety, charging efficiently, be that a high-performance battery charger is necessary.
Traditional lithium battery charger mainly contains constant voltage, constant current two parts control circuit, the charging of control charger.Constant-current charging of battery at first fills and causes certain voltage (be generally 4.2V, the different size battery has difference) and adopt constant voltage charge then.When cell voltage is very low, though insert charger, to battery charge, may still can't satisfy big system load demand, cause the problem that can't start in the incipient stage system that inserts power supply.
Traditional charger construction as shown in Figure 1.Mainly comprise: 1 temperature detection part, effect are to monitor battery temperature.The 2nd, Digital Logic hole control section mainly is the control charging interval, the battery charging state conversion.The 3rd, the analog circuit control section of battery charge mainly is the charging current of control constant current charging mode, and the charging voltage of constant voltage charge pattern.
VIN is that circuit connects power supply input pins such as adapter or USB interface among Fig. 1.BAT is the pin that connects battery.ICHRG is that charging current arranges pin.BATGND is ground wire.NTC is that the battery thermistor connects pin.VNTC is the bigoted voltage pin of battery thermistor, and this pin of some product and VIN merge.
In the simple charging circuit of this tradition, battery-end directly is connected with load, and cell voltage is the supply voltage of load.(be generally less than 2.5V) in the time of battery over-discharge, the voltage of battery is very low, and the load circuit of battery will quit work.At this time product is connected with the mains (VIN inserts power supply), and cell voltage needs certain hour just can be charged to the operating voltage of load needs.Not reaching before this voltage, equipment can occur and insert external power source, but the phenomenon that equipment still can't start rises because equipment need be waited for cell voltage.
Fig. 2 also is a kind of comparatively general charger circuit.8 indications among power supply preprocessing part such as the figure in this circuit, have been introduced.System load links to each other with pin Vsys, is not direct connection battery-end (BAT pin).This by the power supply pre-adjustment, can allow substantially invariable voltage of Vsys end output, can guarantee to insert power supply (pin Vbus connects with the mains) substantially after, load can access a comparatively suitable voltage, has reduced the low influence of cell voltage.
Still comprise 5 indications among battery temperature testing circuit such as the figure in sort circuit, the logic control part is as 6 indications among the figure.2 and 6 logic control flow process figure is generally shown among the figure 3 among the figure.Constant current, constant voltage is controlled as 7 indications among the figure.8 is power supply preliminary treatment among the figure, generally is common DC-DC circuit, and 4 is power sense circuits among the figure.Though a relatively independent load power source can be provided in this circuit.Guarantee that when cell voltage is very low load still can access the voltage of certain value.Heavy but if load this moment becomes, when needing big electric current, descending still can appear in Vsys voltage, is reduced near the cell voltage, still causes load then because electricity shortage occurs unusual.
Summary of the invention
The intelligent load distributor circuit that the purpose of this invention is to provide a kind of lithium battery power supply, adopt a kind of automatic dynamic Current Control Technology of analogy method, satisfy under the low-down situation of cell voltage and charge, still power demands in the time of can satisfying system reload overcomes above-mentioned deficiency of the prior art.
The objective of the invention is to be achieved through the following technical solutions:
A kind of intelligent load distributor circuit of lithium battery power supply, comprise power sense circuit, power source preprocessing circuit, the battery temperature testing circuit, the General Logic control circuit, constant current constant voltage control and other artificial circuit part of charging, the current balance type functional module, cell voltage and system voltage detection comparator, reference voltage and reference current circuit is provided, the positive pole of described power sense circuit is connected with the power source preprocessing circuit output, the output of battery temperature testing circuit and General Logic control circuit, the General Logic control circuit, constant current constant voltage control and other artificial circuit part and the interconnection of current balance type functional module of charging, the current balance type functional module is connected with the circuit that provides of reference voltage and reference current, and providing between the circuit of current balance type functional module and reference voltage and reference current is provided the output of cell voltage and system voltage detection comparator.
Described current balance type functional module, comprise PMOS pipe, the 2nd PMOS pipe, first operational amplifier, second operational amplifier and the 3rd operational amplifier, the output of first operational amplifier is connected with the output of second operational amplifier, the positive pole of second operational amplifier is connected with the output of the 3rd operational amplifier by the PMOS pipe, and the both positive and negative polarity of the 3rd operational amplifier is connected with the 2nd PMOS pipe with PMOS pipe respectively.
Beneficial effect of the present invention is: charging circuit is except comprising traditional constant current, constant-voltage control circuit, the system voltage that has increased analogy method detects and Current Control, automatically mate charging current and load current, when having guaranteed the battery low-voltage charging, still can satisfy the heavily loaded electric current demand of system.
Description of drawings
With reference to the accompanying drawings the present invention is described in further detail below.
Fig. 1 is one of circuit theory diagrams of charger in the prior art;
Fig. 2 be charger in the prior art circuit theory diagrams two;
Fig. 3 is the circuit theory diagrams of the intelligent load distributor circuit of lithium battery power supply of the present invention;
Fig. 4 is the circuit theory diagrams of charge loop of the intelligent load distributor circuit of lithium battery power supply of the present invention;
Fig. 5 is the circuit theory diagrams of current balance type functional module in the intelligent load distributor circuit of lithium battery power supply of the present invention.
Among the figure:
1, temperature detection part; 2, Digital Logic hole control section; 3, the analog circuit control section of battery charge; 4, power sense circuit; 5, battery temperature testing circuit; 6, logic control part; 7, constant current and constant voltage control; 8, power supply preliminary treatment; 9, power sense circuit; 10, power source preprocessing circuit; 11, battery temperature testing circuit; 12, General Logic control circuit; 13, the control of the constant current constant voltage of charging and other artificial circuit part; 14, current balance type functional module; 15, cell voltage and system voltage detection comparator; 16, reference voltage and reference current provides circuit; 17, PMOS pipe; 18, the 2nd PMOS pipe; 19, the 3rd operational amplifier; 20, second operational amplifier; 21, first operational amplifier; 22, stride amplifying circuit Gm.
Embodiment
Shown in Fig. 3-5, the intelligent load distributor circuit of the described a kind of lithium battery power supply of the embodiment of the invention, comprise power sense circuit 9, power source preprocessing circuit 10, battery temperature testing circuit 11, General Logic control circuit 12, constant current constant voltage control and other artificial circuit part 13 of charging, current balance type functional module 14, cell voltage and system voltage detection comparator 15, reference voltage and reference current circuit 16 is provided, the positive pole of described power sense circuit 9 is connected with power source preprocessing circuit 10 outputs, the output of battery temperature testing circuit 11 and General Logic control circuit 12, General Logic control circuit 12, constant current constant voltage control and other artificial circuit part 13 and 14 interconnections of current balance type functional module of charging, current balance type functional module 14 is connected with the circuit 16 that provides of reference voltage and reference current, and providing between the circuit 16 of current balance type functional module 14 and reference voltage and reference current is provided the output of cell voltage and system voltage detection comparator 15.
Described current balance type functional module 14, comprise PMOS pipe the 17, the 2nd PMOS pipe 18, first operational amplifier 21, second operational amplifier 20 and the 3rd operational amplifier 19, it is characterized in that: the output of first operational amplifier 21 is connected with the output of second operational amplifier 20, the positive pole of second operational amplifier 20 is connected with the output of the 3rd operational amplifier 19 by the PMOS pipe, and the both positive and negative polarity of the 3rd operational amplifier 19 is connected with the 2nd PMOS pipe 18 with PMOS pipe 17 respectively.
The circuit structure of the intelligent load distributor circuit of lithium battery power supply is R3 R4 detection system voltage Vsys.Testing result and a fixed voltage are input to one together and stride among the amplifying circuit Gm22; By this mutual conductance amplifying circuit, produce an electric current relevant with system voltage and be injected among the R5; Thereby allow R5 produce a bias voltage; Thereby this bias voltage has changed reference voltage i_ref just often.
Specific embodiment:
VBUS is the input pin of circuit, connects USB or DC power source adapter.For entire circuit provides energy.BAT is the pin that connects lithium battery.Connect outside lithium battery, the SW pin connects inductance and an electric capacity, constitutes the change-over circuit of a DC-to-DC.Be connected to the Vsys pin then.
Power sense circuit 9 is to detect the specified requirement whether direct-current input power supplying reaches circuit.Power source preprocessing circuit 10 is responsible for the power supply current limliting, the DC-DC conversion.Battery temperature testing circuit 11 mainly for detection of the variation of thermistor on the battery, checks whether battery temperature is crossed low or too high.General Logic control circuit 12 is used for controlling charged state conversion and the charging interval monitoring of battery.Constant current constant voltage control and other artificial circuit part 13 of charging are controlled the charging of whole charger.Current balance type functional module 14 is responsible for load current and the charging current of entire circuit and is distributed.Cell voltage and system voltage detection comparator 15, the result that monitoring system voltage and cell voltage are compared, reference voltage and reference current circuit 16 is provided.
Circuit is started working for 16 times at the circuit that provides of reference voltage and reference current.Appear for the first time by power sense circuit 9 and check whether the input power supply of circuit meets the requirements, if undesirable, entire circuit does not start.If meet the requirements, circuit begins to start.At first finished the preliminary treatment of power supply then by power source preprocessing circuit 10, adjust to a voltage that is fit to charging.Whether the temperature on the circuit checks battery meets charging requirement then, if meet the requirements, information is passed to General Logic control circuit 12, prepares charging.After General Logic control circuit 12 is assigned charging instruction.Constant current constant voltage control and other artificial circuit part 13 of charging begin to control charging circuit, and battery is charged.Cell voltage and system voltage detection comparator 15 be supervisory control system voltage and cell voltage constantly, finds that system voltage reduces, and just intervenes charging current by current balance type functional module 14, finishes the balance of system power and charging current.
In the current balance type functional module 14, PMOS pipe 17 is 1000 times of the 2nd PMOS pipe 18.The 3rd operational amplifier 19, thus the source-drain voltage that has guaranteed PMOS pipe the 17 and the 2nd PMOS pipe 18 equates that 1000 times of current mirrors that guaranteed two PMOS pipes concern.Second operational amplifier 20, according to loop characteristics, the operational amplifier input terminal voltage equates, so the voltage of i_ref2 equals the voltage of ICHRG, so the crossing current charging current is: the 1000*i_ref2/R_chg. charging current is by two PMOS pipe mirror image multiplying powers, constant current mode reference voltage i_ref2, and resistance R _ chg determines.First operational amplifier 21 is by feedback resistance R1, and R2 has determined finally being full of of battery jointly.
Can change charging current by the reference voltage i_ref2 that adjusts the crossing current loop.Current balance type functional module 14 detection system voltage Vsys adjust crossing current loop reference voltage i_ref2 automatically, realize the balance of charging current and system power;
I_ref is near the reference voltage (general 1 ~ 1.5V, can be same voltage with V_ref) of cross-flow mode in current balance type functional module 14.V_ref is near the reference voltage (the general 1.2V) of bandgap output.Finally output to the voltage of crossing current loop during i_ref2;
Striding amplifying circuit Gm22 module is a Voltage-controlled Current Source circuit.The output of striding amplifying circuit Gm22 is electric current, its output current i_gm=Gm*(V_ref-Vsys*R3/(R3+R4));
From top formula as can be seen
i_ref2=i_ref-R5*i_gm
Battery charge: Ichg=i_ref2/R_chg * 1000
Can find out that from above formula when system voltage output current of Gm than higher the time is 0, circuit charges normal.
When Vsys voltage is lower than near some voltage (normally the 3.6V), Gm meeting output current, electric current is injected among the R5, has changed i_ref.This Circuits System is finished the voltage of automatic adjustment i_ref2, and i_ref2 controls charge loop, thereby finishes the adjustment of charging current, has guaranteed that as far as possible system voltage Vsys's is stable.
To adopt a kind of automatic dynamic Current Control Technology of analogy method among the present invention, and satisfy under the low-down situation of cell voltage and charge, power demands in the time of still can satisfying system reload.Charging circuit is except comprising traditional constant current, constant-voltage control circuit, the system voltage that has increased analogy method detects and Current Control, mates charging current and load current automatically, when having guaranteed the battery low-voltage charging, still can satisfy the heavily loaded electric current demand of system.
Claims (1)
1. the intelligent load distributor circuit of a lithium battery power supply, comprise power sense circuit (9), power source preprocessing circuit (10), battery temperature testing circuit (11), General Logic control circuit (12), constant current constant voltage control and other artificial circuit part (13) of charging, current balance type functional module (14), cell voltage and system voltage detection comparator (15), reference voltage and reference current circuit (16) is provided, the positive pole of described power sense circuit (9) is connected with power source preprocessing circuit (10) output, the output of battery temperature testing circuit (11) is connected with General Logic control circuit (12), General Logic control circuit (12) links to each other with current balance type functional module (14) with constant current constant voltage control and other artificial circuit part (13) of charging respectively, and constant current constant voltage control and other artificial circuit part (13) of charging are connected with current balance type functional module (14); Current balance type functional module (14) is connected with the circuit (16) that provides of reference voltage and reference current, and the output of cell voltage and system voltage detection comparator (15) is connected with General Logic control circuit (12).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110088362 CN102195321B (en) | 2011-04-08 | 2011-04-08 | Intelligent load distribution circuit of lithium battery power |
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| CN 201110088362 CN102195321B (en) | 2011-04-08 | 2011-04-08 | Intelligent load distribution circuit of lithium battery power |
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| CN102195321A CN102195321A (en) | 2011-09-21 |
| CN102195321B true CN102195321B (en) | 2013-08-14 |
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| CN 201110088362 Expired - Fee Related CN102195321B (en) | 2011-04-08 | 2011-04-08 | Intelligent load distribution circuit of lithium battery power |
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| CN107046315B (en) * | 2017-05-10 | 2023-05-05 | 珈伟新能源股份有限公司 | Battery constant current charging management circuit |
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| CN101001020A (en) * | 2006-12-30 | 2007-07-18 | 深圳市芯海科技有限公司 | Lithium battery charge control loop |
| CN101814756B (en) * | 2010-04-12 | 2012-05-30 | 深圳市纳芯威科技有限公司 | Constant-current and constant-voltage control circuit, charging circuit and charger |
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