CN102148520A - Intelligent charging circuit automatically adjusting charging current according to temperature of chip - Google Patents
Intelligent charging circuit automatically adjusting charging current according to temperature of chip Download PDFInfo
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- CN102148520A CN102148520A CN2011100865008A CN201110086500A CN102148520A CN 102148520 A CN102148520 A CN 102148520A CN 2011100865008 A CN2011100865008 A CN 2011100865008A CN 201110086500 A CN201110086500 A CN 201110086500A CN 102148520 A CN102148520 A CN 102148520A
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- operational amplifier
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Abstract
The invention relates to an intelligent charging circuit automatically adjusting a charging current according to the temperature of a chip, which comprises a first PMOS (positive channel metal oxide semiconductor) tube, a second PMOS (positive channel metal oxide semiconductor) tube, at third PMOS (positive channel metal oxide semiconductor) tube, a first operational amplifier, a second operational amplifier, a third operational amplifier, and a temperature control module; the first operational amplifier, the second operational amplifier, and the third operational amplifier are connected in series; a temperature control module is connected with the second operational amplifier; the third PMOS (positive channel metal oxide semiconductor) tube is connected with the third operational amplifier; the first PMOS (positive channel metal oxide semiconductor) tube and the second PMOS (positive channel metal oxide semiconductor) tube are connected, and are connected with the third PMOS (positive channel metal oxide semiconductor) tube in parallel. The intelligent charging circuit automatically adjusting the charging current according to the temperature of the chip has the beneficial effects that: as a temperature sensor, a temperature monitoring system and automatic current control are added, the charging current is automatically adjusted according to the temperature of the chip; the technology can lighten the influence of temperature change on loop characteristics, reduce the design difficulty, can lead the temperature and the current to show a relationship approaching to linear relationship in a high temperature area, and guarantees the charging is completed quickly and safely.
Description
Technical field
The present invention relates to a kind of charging technique field, relate in particular to a kind of aptitude chargeable circuit of adjusting charging current according to chip temperature automatically.
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.Present battery capacity constantly increases, and charging current is also increasing.When how to avoid under hot environment large current charge, chip can not burn because of heating becomes some problems that run into now.
Summary of the invention
The purpose of this invention is to provide a kind of aptitude chargeable circuit of adjusting charging current according to chip temperature automatically, adopt a kind of inner integrated temperature sensor, technology based on chip temperature automatic dynamic control electric current, satisfy at charging circuit under the big current conditions of high temperature, still can not burn, and continue as battery charge, overcome above-mentioned deficiency of the prior art.
The objective of the invention is to be achieved through the following technical solutions:
A kind of aptitude chargeable circuit of adjusting charging current according to chip temperature automatically, comprise PMOS pipe, the 2nd PMOS pipe, the 3rd PMOS pipe, first operational amplifier, second operational amplifier, the 3rd operational amplifier and temperature control modules, first operational amplifier, second operational amplifier and the series connection of the 3rd operational amplifier, first operational amplifier is connected with battery, be connected with temperature control modules on second operational amplifier, the 3rd operational amplifier is connected with battery, be connected with the 3rd PMOS pipe on the 3rd operational amplifier, PMOS pipe is connected with the 2nd PMOS pipe and is in parallel with the 3rd operational amplifier.
Described temperature control modules is made of constant current source, resistance and BJT device, constant current source, first resistance and BJT device are connected in series, first resistance is connected with the trsanscondutance amplifier negative pole, be connected with second resistance on the trsanscondutance amplifier, the positive pole of trsanscondutance amplifier is connected with the reference voltage incoming line.
Described temperature control modules is made of constant current source, positive temperature current source, resistance and BJT device, constant current source, first resistance and BJT device are connected in series, first resistance is connected with the trsanscondutance amplifier negative pole, be connected with second resistance on the trsanscondutance amplifier, the BJT device is connected with the 3rd resistance by circuit, the 3rd resistance is connected with positive temperature current source, and the 3rd resistance is crossed the reference voltage incoming line with the link tester between the positive temperature current source and is connected with the positive pole of trsanscondutance amplifier.
Described temperature control modules is made of constant current source, resistance and BJT device, constant current source, first resistance and BJT device are connected in series, first resistance is connected with the trsanscondutance amplifier negative pole, is connected with second resistance on the trsanscondutance amplifier, and the positive pole of trsanscondutance amplifier is connected with second resistance.
Beneficial effect of the present invention is: charging circuit is except comprising traditional constant current, constant-voltage control circuit has increased temperature sensor, temperature monitoring system and automatic current control, automatically adjust charging current according to chip temperature, this technology can alleviate the influence of variations in temperature to loop characteristics; Reduce design difficulty, and can allow temperature and electric current be, guarantee the charging of finishing fast and safely near linear relationship at high-temperature area.
Description of drawings
With reference to the accompanying drawings the present invention is described in further detail below.
Fig. 1 is a kind of circuit theory diagrams of adjusting the aptitude chargeable circuit of charging current according to chip temperature automatically of the present invention;
Fig. 2 is the circuit theory diagrams of the temperature control modules described in the embodiment of the invention one;
Fig. 3 is the circuit theory diagrams of the temperature control modules described in the embodiment of the invention two;
Fig. 4 is the circuit theory diagrams of the temperature control modules described in the embodiment of the invention three.
Among the figure:
1, PMOS pipe; 2, the 2nd PMOS pipe; 3, the 3rd PMOS pipe; 4, first operational amplifier; 5, second operational amplifier; 6, the 3rd operational amplifier; 7, temperature control modules.
Embodiment
As shown in Figure 1, the described a kind of aptitude chargeable circuit of adjusting charging current according to chip temperature automatically of the embodiment of the invention, comprise PMOS pipe 1, the 2nd PMOS pipe 2, the 3rd PMOS pipe 3, first operational amplifier 4, second operational amplifier 5, the 3rd operational amplifier 6 and temperature control modules 7, first operational amplifier 4, second operational amplifier 5 and 6 series connection of the 3rd operational amplifier, first operational amplifier 4 is connected with battery, be connected with temperature control modules 7 on second operational amplifier 5, the 3rd operational amplifier 6 is connected with battery, be connected with on the 3rd operational amplifier 6 that the 3rd PMOS pipe 3, the one PMOS pipe 1 is connected with the 2nd PMOS pipe 2 and in parallel with the 3rd operational amplifier 6.
Wherein PMOS pipe 1 is that the 2nd PMOS manages 2 1000 times.Thereby the 3rd operational amplifier 6 has guaranteed the source-drain voltage of PMOS pipe the 1, the 2nd PMOS pipe 2 and has equated to guarantee 1000 times of current mirror relations of two PMOS pipes (being meant that n type substrate, P raceway groove lean on the mobile metal-oxide-semiconductor that transports electric current in hole).Second operational amplifier 5 is the operational amplifiers in the crossing current loop, according to loop characteristics, second operational amplifier, 5 input terminal voltages equate, so the voltage of i_ref2 equals the voltage of ICHRG, so the crossing current charging current is: 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 decision.The 3rd operational amplifier 6 is the operational amplifiers in the constant voltage mode loop.By feedback resistance Rf4, what Rf5 had determined battery jointly finally is full of voltage.
Can change charging current by the reference voltage i_ref2 that adjusts the crossing current loop.Temperature control modules 7 detection chip temperature are adjusted crossing current loop reference voltage i_ref2 automatically, realize adjusting charging current automatically according to temperature change.
Embodiment one:
As shown in Figure 2, described temperature control modules 7 is made of constant current source, resistance and BJT device, constant current source, first resistance and BJT device are connected in series, first resistance is connected with trsanscondutance amplifier (PTAT) negative pole, be connected with second resistance on the trsanscondutance amplifier, the positive pole of trsanscondutance amplifier is connected with the reference voltage incoming line.
I_ref is near the reference voltage (general 1 ~ 1.5V, can be same voltage with V_ref) of cross-flow mode in this module.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.
The Gm module is a Voltage-controlled Current Source circuit.The output of Gm is electric current, its output current i_gm=Gm* (V_ref-V_tem), and wherein Gm is the mutual conductance of module 12, V_tem is the temperature induced potential output of temperature sensor
i_ref2=i_ref-R5*i_gm
Battery charge: Ichg=i_ref2/R_chg * 1000
From above formula, can find out, when the temperature sense voltage of temperature sensor change the time, this Circuits System can be adjusted the voltage of i_ref2 automatically, thereby finishes the adjustment of charging current automatically, has guaranteed that as far as possible chip temperature changes the adjustment of back to charging current
Embodiment two:
As shown in Figure 3, described temperature control modules 7 is made of constant current source, positive temperature current source, resistance and BJT device, constant current source, first resistance and BJT device are connected in series, first resistance is connected with the trsanscondutance amplifier negative pole, be connected with second resistance on the trsanscondutance amplifier, the BJT device is connected with the 3rd resistance by circuit, and the 3rd resistance is connected with positive temperature current source, and the 3rd resistance is crossed the reference voltage incoming line with the link tester between the positive temperature current source and is connected with the positive pole of trsanscondutance amplifier.
V_tem and V_ref import among a trsanscondutance amplifier (Voltage-controlled Current Source circuit) Gm together.Gm produces an electric current with temperature correlation, injection R5 then.Thereby change i_ref2
This part formula and principle all follow Fig. 2 identical
Identical among formula and Fig. 2
The output of Gm is electric current, its output current i_gm=Gm* (V_ref-V_tem), and wherein Gm is the mutual conductance of module 12, V_tem is the temperature induced potential output of temperature sensor;
i_ref2=i_ref-R5*i_gm
Battery charge: Ichg=i_ref2/R_chg * 1000
Embodiment three:
As shown in Figure 4, described temperature control modules 7 is made of constant current source, resistance and BJT device, constant current source, first resistance and BJT device are connected in series, first resistance is connected with the trsanscondutance amplifier negative pole, be connected with second resistance on the trsanscondutance amplifier, the positive pole of trsanscondutance amplifier is connected with second resistance.To reach the temperature sensor circuit that no matter adopts what pattern, as long as adopt this voltage and other voltages that produce a temperature correlation by temperature sensor, be input to a trsanscondutance amplifier (Voltage-controlled Current Source) and produce an electric current then, inject the resistance that can produce biasing then, regulate the voltage of charger current loop.
The output of Gm is electric current, its output current i_gm=Gm* (i_ref-V_tem), and wherein Gm is the mutual conductance of module 12, V_tem is the temperature induced potential output of temperature sensor.
i_ref2=i_ref-R5*i_gm
Battery charge: Ichg=i_ref2/R_chg * 1000
Charging circuit of the present invention is except comprising traditional constant current, constant-voltage control circuit has increased temperature sensor, temperature monitoring system and automatic current control, automatically adjust charging current according to chip temperature, this technology can alleviate the influence of variations in temperature to loop characteristics; Reduce design difficulty, and can allow temperature and electric current be, guarantee the charging of finishing fast and safely near linear relationship at high-temperature area.
Claims (4)
1. aptitude chargeable circuit of adjusting charging current according to chip temperature automatically, comprise PMOS pipe (1), the 2nd PMOS manages (2), the 3rd PMOS manages (3), first operational amplifier (4), second operational amplifier (5), the 3rd operational amplifier (6) and temperature control modules (7), first operational amplifier (4), second operational amplifier (5) and the 3rd operational amplifier (6) series connection, first operational amplifier (4) is connected with battery, be connected with temperature control modules (7) on second operational amplifier (5), the 3rd operational amplifier (6) is connected with battery, be connected with the 3rd PMOS pipe (3) on the 3rd operational amplifier (6), PMOS pipe (1) is connected with the 2nd PMOS pipe (2) and is in parallel with the 3rd operational amplifier (6).
2. the aptitude chargeable circuit of adjusting charging current according to chip temperature automatically according to claim 1, it is characterized in that: described temperature control modules (7) is made of constant current source, resistance and BJT device, wherein constant current source, first resistance and BJT device are connected in series and first resistance is connected with the trsanscondutance amplifier negative pole, be connected with second resistance on the trsanscondutance amplifier, the positive pole of trsanscondutance amplifier is connected with the reference voltage incoming line.
3. the aptitude chargeable circuit of adjusting charging current according to chip temperature automatically according to claim 1, it is characterized in that: described temperature control modules (7) is by constant current source, positive temperature current source, resistance and BJT device constitute, constant current source wherein, first resistance is connected in series with the BJT device and first resistance is connected with the trsanscondutance amplifier negative pole, be connected with second resistance on the trsanscondutance amplifier, the BJT device is connected with the 3rd resistance by circuit, the 3rd resistance is connected with positive temperature current source, and the 3rd resistance is crossed the reference voltage incoming line with the link tester between the positive temperature current source and is connected with the positive pole of trsanscondutance amplifier.
4. a kind of aptitude chargeable circuit of adjusting charging current according to chip temperature automatically according to claim 1, it is characterized in that: described temperature control modules (7) is made of constant current source, resistance and BJT device, wherein constant current source, first resistance and BJT device are connected in series and first resistance is connected with the trsanscondutance amplifier negative pole, be connected with second resistance on the trsanscondutance amplifier, the positive pole of trsanscondutance amplifier is connected with second resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110086500.8A CN102148520B (en) | 2011-04-07 | 2011-04-07 | Intelligent charging circuit automatically adjusting charging current according to temperature of chip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110086500.8A CN102148520B (en) | 2011-04-07 | 2011-04-07 | Intelligent charging circuit automatically adjusting charging current according to temperature of chip |
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| CN102148520A true CN102148520A (en) | 2011-08-10 |
| CN102148520B CN102148520B (en) | 2014-04-02 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102412611A (en) * | 2011-12-07 | 2012-04-11 | 西安启芯微电子有限公司 | Constant-current charging circuit applied to linear charger |
| CN102801199A (en) * | 2012-09-03 | 2012-11-28 | 东莞宇龙通信科技有限公司 | Terminal and terminal charging method |
| CN103248074A (en) * | 2012-02-03 | 2013-08-14 | 无锡华润上华半导体有限公司 | Charging device for secondary battery |
| CN111030238A (en) * | 2019-12-25 | 2020-04-17 | 启攀微电子（上海）有限公司 | Charging circuit of charger of lithium battery |
| CN111293736A (en) * | 2018-12-07 | 2020-06-16 | 青岛海信移动通信技术股份有限公司 | Method and equipment for controlling temperature |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104020810A (en) * | 2014-05-30 | 2014-09-03 | 无锡中星微电子有限公司 | USB interface and voltage stabilizing and current limiting circuit thereof |
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| CN103248074A (en) * | 2012-02-03 | 2013-08-14 | 无锡华润上华半导体有限公司 | Charging device for secondary battery |
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| CN111293736B (en) * | 2018-12-07 | 2023-11-03 | 青岛海信移动通信技术有限公司 | Method and equipment for controlling temperature |
| CN111030238A (en) * | 2019-12-25 | 2020-04-17 | 启攀微电子（上海）有限公司 | Charging circuit of charger of lithium battery |
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