CN101924383B - Mobile terminal of automatically setting charging current and implementation method thereof - Google Patents
Mobile terminal of automatically setting charging current and implementation method thereof Download PDFInfo
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- CN101924383B CN101924383B CN201010256146.4A CN201010256146A CN101924383B CN 101924383 B CN101924383 B CN 101924383B CN 201010256146 A CN201010256146 A CN 201010256146A CN 101924383 B CN101924383 B CN 101924383B
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Abstract
The invention discloses a mobile terminal of automatically setting a charging current and an implementation method thereof. The mobile terminal is provided with a charging port, wherein the charging port comprises a charging circuit, a PMIC (Power Management Integrated Circuit) module provided with the charging current, a first voltage detection module used for detecting a charging voltage, a current detection module used for detecting the charging current, and a second voltage detection module used for detecting the output voltage of a charger. The mobile terminal can obtain the maximum charging current of the charger through the second voltage detection module detecting the output voltage of the charger in real time and the PMIC module judging if the voltage is more than the preset voltage of the mobile terminal. Besides, the maximum charging current is set as the final charging current of the mobile terminal, and the charging efficiency of the mobile terminal is improved. When charged, the mobile terminal can automatically set the charging current according to chargers of different powers, and can realize electric compatibility.
Description
Technical field
The present invention relates to the charging technique of mobile terminal, particularly a kind of mobile terminal of Lookup protocol charging current and its implementation.
Background technology
Charger for mobile phone is in the market varied, and the interface of charger, electrical characteristic, particularly power curve (voltage-to-current curve) are not identical yet.For the charger of unified mobile phone, China Ministry of Industry and Information is also in the relevant criterion of working out mobile phone charging interface, thereby makes user when buying mobile phone, needn't buy a charger for mobile phone simultaneously again.
Aforesaid way only allows user can on a kind of mobile phone of model, insert the charger of different brands on the interface of charger, but two problems below also needing to solve on mobile phone electric:
If one adopts the less charger of power output to charge the phone, and the required charge power of mobile phone charging scheme is greater than the peak power output of this charger, can cause charger cannot export large power like this and cisco unity malfunction;
If two adopt the larger charger of power output to charge the phone, and the required charge power of mobile phone charging scheme is lower than the peak power output of this charger, can make charger cannot bring into play its maximum effect.
Thereby the charging technique of existing mobile terminal need to improve.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide mobile terminal and its implementation of a kind of Lookup protocol charging current, the electrical characteristic of the electrical equipment that can compatiblely charge when charging.
In order to achieve the above object, the present invention has taked following technical scheme:
A kind of mobile terminal of Lookup protocol charging current, described mobile terminal has a charging port, wherein, comprise: charging circuit, the PMIC module of charging current is set, for detection of the first voltage detection module of charging voltage, for detection of the current detection module of charging current with for detection of the second voltage detection module of charger output voltage;
The first output of described PMIC module is connected with the first input end of described charging circuit, the second output of described PMIC module is connected with the second input of described charging circuit by described current detection module, the 3rd output of described PMIC module is connected with the 3rd input of described charging circuit by the first voltage detection module, and the 4th output of described PMIC module is connected with described charging port by second voltage detection module;
The four-input terminal of described charging circuit connects described charging port, the output head grounding of described charging circuit;
Described mobile terminal detects the output voltage of charger in real time by second voltage detection module, and judge by PMIC module whether this voltage is greater than mobile terminal predeterminated voltage, thereby obtain the maximum charging current of charger, and the final charging current of mobile terminal is set;
Described charging circuit comprises metal-oxide-semiconductor, diode, the first resistance and battery; Wherein
The source electrode of described metal-oxide-semiconductor connects charging port, and grid connects the first output of PMIC module, and drain electrode connects the first resistance by described diode;
Described the first resistance connects the positive pole of battery, the minus earth of described battery;
Described current detection module is connected with the negative electrode of described diode, and the first voltage detection module is connected described the first resistance resistance with the positive pole of battery is 0.2 Ω, and described mobile terminal predeterminated voltage is 4.9V;
At the voltage of charger output, during lower than 4.9V, obtain the maximum current of charger output, and this maximum current is set to the finishing rate of mobile terminal; When the voltage of charger output is greater than 4.9V, by PMIC module, electric current is increased to a step-length gradually, until this electric current is while being greater than 1.5A, and this electric current is set to charger to the ultimate current of mobile terminal charging, and charger is charged to mobile terminal.
The mobile terminal of described Lookup protocol charging current wherein, is provided with a voltage sampling circuit between described second voltage detection module and charging port, and the output of described second voltage detection module connects the dividing point of described voltage sampling circuit.
The mobile terminal of described Lookup protocol charging current, wherein, described voltage sampling circuit is in series by the second resistance and the 3rd resistance, and described the second resistance is connected with charging port, the 3rd grounding through resistance.
The mobile terminal of described Lookup protocol charging current, wherein, described the first voltage detection module and second voltage detection module are ADC voltage detection module; Described current detection module is ADC current detection module.
A kind of method of Lookup protocol mobile terminal charging current, wherein, described method detects the output voltage of charger in real time by second voltage detection module, and judge by PMIC module whether this voltage is greater than mobile terminal predeterminated voltage, thereby obtain the maximum charging current of charger, and the final charging current of mobile terminal is set, it comprises the following steps:
A, the charging current of mobile terminal is set by PMIC module;
B, the voltage of being exported by second voltage detection module detection charger;
C, by PMIC module, obtain the magnitude of voltage that second voltage detection module detects, and judge whether this magnitude of voltage is greater than the predeterminated voltage of mobile terminal; If so, perform step D; Otherwise, execution step E; Described mobile terminal predeterminated voltage is 4.9V;
D, by described PMIC module, described charging current is increased to a step-length, and whether judgement electric current is now greater than the maximum charging current that PMIC module arranges; If so, perform step E; Otherwise, return to step B; The maximum charging current of PMIC module setting is 1.5A;
E, by described PMIC module, obtained the electric current of charger output, and this electric current is set to the finishing rate of mobile terminal.
The method of described Lookup protocol mobile terminal charging current, wherein, the charging current that PMIC module arranges mobile terminal is 100mA.
The method of described Lookup protocol mobile terminal charging current, wherein, described step-length is 50mA.
The mobile terminal of a kind of Lookup protocol charging current provided by the invention and its implementation, this mobile terminal has adopted the PMIC module that charging current is set, the first voltage detection module for detection of charging voltage, for detection of the current detection module of charging current with for detection of the second voltage detection module of charger output voltage, by second voltage detection module, detect in real time the output voltage of charger, and judge by PMIC module whether this voltage is greater than mobile terminal predeterminated voltage, thereby obtain the maximum charging current of charger, and the final charging current of mobile terminal is set, improved the charge efficiency of mobile terminal.And this mobile terminal is in when charging, the charging current in the time of can be according to the charger Lookup protocol charging of different capacity, the compatibility on electric while having realized mobile terminal charging.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of mobile terminal of the present invention;
Fig. 2 is the circuit structure diagram of mobile terminal of the present invention;
Fig. 3 is the power of Mobile terminal charger;
Fig. 4 is the method flow diagram of Lookup protocol mobile terminal charging current of the present invention.
Embodiment
The invention provides mobile terminal and its implementation of a kind of Lookup protocol charging current, the electrical characteristic in the time of unifying mobile terminal charging, makes the electric upper compatibility of mobile terminal, can be to the mobile terminal charging of different brands thereby realized a charger.Described mobile terminal is mobile phone, and the present invention has unified the electrical characteristic of mobile phone charging, and user, when buying new mobile phone, need not buy a charger for mobile phone again, has saved the cost of Cellphone Accessories, has realized the unification of charger for mobile phone.
For making object of the present invention, technical scheme and effect clearer, clear and definite, referring to accompanying drawing examples, the present invention is described in more detail.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 1, mobile terminal for Lookup protocol charging current of the present invention, comprise charging port 110, PMIC(project management integrate circuit, power management chip) module 120, charging circuit 130, current detection module 140, the first voltage detection module 150 and second voltage detection module 160.
Wherein, mobile terminal inserts charger by charging port 110 and charges, PMIC module 120 is for arranging the charging current of mobile terminal, charging circuit 130 is for coordinating PMIC module to realize the control of charging current and charging voltage, the first voltage detection module 150 is for detection of the charging voltage in charging circuit 130, second voltage detection module 160 is for detection of the voltage of charger output, and current detection module 140 is for coordinating the first voltage detection module 150 to detect the charging current of charging circuit 130.
The first output of described PMIC module 120 is connected with the first input end of charging circuit 130, the second output of PMIC module 120 is connected with the second input of charging circuit 130 by current detection module 140, the 3rd output of PMIC module 120 is connected with the 3rd input of charging circuit 130 by the first voltage detection module 150, the 4th output of PMIC module 120 is connected with charging port 110 by second voltage detection module 160, the four-input terminal of charging circuit 130 connects described charging port 110, the output head grounding of charging circuit 130.
In the present embodiment, the first voltage detection module 150 and second voltage detection module 160 are ADC(Analog Digital Converter, analog-to-digital conversion) voltage detection module, current detection module 140 is ADC current detection module.
See also Fig. 2, described charging circuit 130 comprises metal-oxide-semiconductor (metal oxid semiconductor, field-effect transistor) M1, diode D1, the first resistance R 1 and battery Bat.Described metal-oxide-semiconductor M1 is P raceway groove (model of metal-oxide-semiconductor) metal-oxide-semiconductor, the main on-off action that rises in charging circuit 130.
In the present embodiment, the source electrode of described metal-oxide-semiconductor M1 connects charging port 110, and metal-oxide-semiconductor M1 grid connects the first output of PMIC module 120, and drain electrode connects the first resistance R 1 by diode D1.Described the first resistance R 1 connects the positive pole of battery Bat, the minus earth of battery.
Wherein, the first resistance R 1 is that a charging detects resistance, and its resistance is 0.2 Ω (ohm).Current detection module 140 is connected with the negative electrode of diode D1, and for detection of the electric current that flows through diode, the first voltage detection module 150 connects the positive pole of battery, for detection of the voltage on battery Bat.
Please continue to refer to Fig. 1 and Fig. 2, the mobile terminal of Lookup protocol charging current of the present invention arranges a voltage sampling circuit 170 between second voltage detection module 160 and charging port 110.In the present embodiment, the output of second voltage detection module 160 connects the dividing point of described voltage sampling circuit 170, thereby the voltage obtaining according to this voltage sampling circuit detects the voltage that charging port is exported in real time.
Wherein, described voltage sampling circuit 170 is in series by the second resistance R 2 and the 3rd resistance R 3, and described the second resistance R 1 is connected with charging port 110, the 3rd resistance R 3 ground connection.
Below operation principle of the present invention is elaborated:
Refer to Fig. 3, the power that Fig. 3 is Mobile terminal charger, from this curve chart, the output voltage of charger can reduce when charged electrical rheology is large.When charger inserts after mobile terminal, when PMIC module 120 has detected charger insertion, the charging current of configuration mobile terminal, enters different charge modes according to the current cell voltage of mobile terminal.
If current mobile terminal cell voltage, lower than 3.2V, enters precharge mode, at this moment charging current is less, so less demanding to charger.
If the voltage of battery of mobile terminal is higher than 3.2V, but lower than 4.2V, enter constant current charging mode, in this stage, it is maximum that charging institute requires the electric current of consumption, is also to the prominent stage of charger requirement.
If battery of mobile terminal voltage is higher than 4.2V, mobile terminal enters constant voltage charge pattern, and this pattern guarantees that cell voltage is constant, and charged electrical fails to be convened for lack of a quorum and gradually reduces, and will stop charging after charging current reduces to certain thresholding.So it is not under this pattern, high to the power requirement of charger yet.Drawing thus, is also in the constant current charge stage to the power requirement of charger.
When mobile terminal charges, suppose that the charging current in Fig. 2 is I, according to metal-oxide-semiconductor M1, the electrical connection of diode D1, the first resistance R 1 and battery Bat can be learnt V
charge=V
ds+ V
d1+ V
r1+ V
bat.Wherein, V
dsthe conducting voltage on metal-oxide-semiconductor M1, V
d1the voltage on diode D1, V
r1the voltage in the first resistance R 1, V
batthe voltage on battery.
Due to, the resistance of the first resistance R 1 is 0.2 Ω, so the pressure drop in the first resistance R 1 can ignore, and conduction voltage drop V on metal-oxide-semiconductor M1
dssmaller, thus also can ignore, and V
d1generally between 0.5V～0.7V, cell voltage V
batin the constant current charge stage, the highlyest can reach 4.2V,
In order to meet the requirement of above-mentioned constant current charge, V
charge>V
d1+ V
bat=4.9V, as long as more than guaranteeing that charger output voltage is greater than 4.9V, just can guarantee the needed electric current of constant current charge.And the object of present embodiment is just to locate this maximum current, this maximum current is exactly that charger can be exported, and can guarantee that mobile terminal carries out the electric current of charging quickly, while realizing mobile terminal charging, and the unification in electrical characteristic.
Refer to Fig. 4, Fig. 4 is the method flow diagram of Lookup protocol mobile terminal charging current of the present invention, the final purpose of the method is in the situation that meeting charger output minimum voltage, allows charger with maximum output current, mobile phone be charged, and described method comprises the following steps:
S101, the charging current of mobile terminal is set by PMIC module;
When charger inserts mobile terminal, PMIC module detects has charger to insert, the charging current of Lookup protocol mobile terminal then, and the scope of this charging current is 0mA to 1.5A, certainly less or larger scope can also be set as required.In the present embodiment, PMIC module charging current is set to 100mA, and take 50mA as a step-length.
S102, the voltage of being exported by second voltage detection module detection charger;
In the present embodiment, the voltage of charger output is obtained by voltage sampling circuit, the voltage on voltage sampling circuit detected, and this magnitude of voltage is sent to PMIC module by second voltage detection module.
S103, by PMIC module, obtain the magnitude of voltage that second voltage detection module detects, and judge whether this magnitude of voltage is greater than the predeterminated voltage of mobile terminal; If so, perform step S104; Otherwise, execution step S105;
When charging, the predeterminated voltage that described PMIC module arranges mobile terminal is 4.9V, and judge by PMIC module whether the voltage of charger output is greater than 4.9V, when the voltage of charger output is greater than 4.9V, the electric current of charging circuit is set by PMIC module, when this voltage is less than 4.9V, execution step S105.
S104, by described PMIC module, described charging current is increased to a step-length, and whether judgement electric current is now greater than the maximum charging current that PMIC module arranges; If so, perform step S105; Otherwise, return to step S102;
When the voltage of charger output is greater than 4.9V, PMIC module arranges charging current I1=I+50mA, be that PMIC module increases a step-length (50mA) by charging current, and then whether judgement electric current is now greater than the maximum charging current that PMIC module arranges, i.e. 1.5A.When this electric current I 1 is greater than 1.5A, execution step S105 returns to step S102, then processes when being less than 1.5A.
S105, by described PMIC module, obtained the maximum current of charger output, and this maximum current is set to the finishing rate of mobile terminal.
Electrical characteristic from above-mentioned mobile terminal, when the voltage of charger output is during lower than 4.9V, can guarantee the mobile terminal required electric current that charges, this step can be by the voltage in charger output lower than 4.9 o'clock, thereby find the maximum current of charger output to guarantee mobile terminal to carry out quick charge.And in this constant current charge stage, when the voltage of charger output is greater than 4.9V, by PMIC module, electric current is increased to a step-length gradually, until this electric current is while being greater than the maximum charging current that PMIC module arranges, PMIC module finds this electric current, and this electric current is set to charger to the ultimate current of mobile terminal charging, charger is charged to mobile terminal.
The present invention be take gradually step-length by PMIC module by charging current and is increased progressively as 50mA, until the voltage that charger output detected is during lower than 4.9V, charging current is now the maximum current that this charger can be exported, mobile terminal charges by this electric current, and charger is operated under best operating state.
In sum, the mobile terminal of a kind of Lookup protocol charging current provided by the invention and its implementation, this mobile terminal has adopted the PMIC module that charging current is set, the first voltage detection module for detection of charging voltage, for detection of the current detection module of charging current with for detection of the second voltage detection module of charger output voltage, by second voltage detection module, detect in real time the output voltage of charger, and judge by PMIC module whether this voltage is greater than mobile terminal predeterminated voltage, thereby find the maximum charging current of the applicable mobile terminal charging that charger can export, and be set to the ultimate current of mobile terminal charging, improved the charge efficiency of mobile terminal.This mobile terminal is in when charging, the charging current in the time of can be according to the charger Lookup protocol charging of different capacity, the compatibility on electric while having realized mobile terminal charging.
Be understandable that, for those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (7)
1. the mobile terminal of a Lookup protocol charging current, described mobile terminal has a charging port, it is characterized in that, comprise: charging circuit, the PMIC module of charging current is set, for detection of the first voltage detection module of charging voltage, for detection of the current detection module of charging current with for detection of the second voltage detection module of charger output voltage;
The first output of described PMIC module is connected with the first input end of described charging circuit, the second output of described PMIC module is connected with the second input of described charging circuit by described current detection module, the 3rd output of described PMIC module is connected with the 3rd input of described charging circuit by the first voltage detection module, and the 4th output of described PMIC module is connected with described charging port by second voltage detection module;
The four-input terminal of described charging circuit connects described charging port, the output head grounding of described charging circuit;
Described mobile terminal detects the output voltage of charger in real time by second voltage detection module, and judge by PMIC module whether this voltage is greater than mobile terminal predeterminated voltage, thereby obtain the maximum charging current of charger, and the final charging current of mobile terminal is set;
Described charging circuit comprises metal-oxide-semiconductor, diode, the first resistance and battery; Wherein
The source electrode of described metal-oxide-semiconductor connects charging port, and grid connects the first output of PMIC module, and drain electrode connects the first resistance by described diode;
Described the first resistance connects the positive pole of battery, the minus earth of described battery;
Described current detection module is connected with the negative electrode of described diode, and the first voltage detection module is connected with the positive pole of battery; The resistance of described the first resistance is 0.2 Ω, and described mobile terminal predeterminated voltage is 4.9V;
At the voltage of charger output, during lower than 4.9V, obtain the maximum current of charger output, and this maximum current is set to the finishing rate of mobile terminal; When the voltage of charger output is greater than 4.9V, by PMIC module, electric current is increased to a step-length gradually, until this electric current is while being greater than 1.5A, and this electric current is set to charger to the ultimate current of mobile terminal charging, and charger is charged to mobile terminal.
2. the mobile terminal of Lookup protocol charging current according to claim 1, it is characterized in that, between described second voltage detection module and charging port, be provided with a voltage sampling circuit, the output of described second voltage detection module connects the dividing point of described voltage sampling circuit.
3. the mobile terminal of Lookup protocol charging current according to claim 2, is characterized in that, described voltage sampling circuit is in series by the second resistance and the 3rd resistance, and described the second resistance is connected with charging port, the 3rd grounding through resistance.
4. the mobile terminal of Lookup protocol charging current according to claim 1, is characterized in that, described the first voltage detection module and second voltage detection module are ADC voltage detection module; Described current detection module is ADC current detection module.
5. the method for a Lookup protocol mobile terminal charging current, it is characterized in that, described method detects the output voltage of charger in real time by second voltage detection module, and judge by PMIC module whether this voltage is greater than mobile terminal predeterminated voltage, thereby obtain the maximum charging current of charger, and the final charging current of mobile terminal is set, it comprises the following steps:
A, the charging current of mobile terminal is set by PMIC module;
B, the voltage of being exported by second voltage detection module detection charger;
C, by PMIC module, obtain the magnitude of voltage that second voltage detection module detects, and judge whether this magnitude of voltage is greater than the predeterminated voltage of mobile terminal; If so, perform step D; Otherwise, execution step E; Described mobile terminal predeterminated voltage is 4.9V;
D, by described PMIC module, described charging current is increased to a step-length, and whether judgement electric current is now greater than the maximum charging current that PMIC module arranges; If so, perform step E; Otherwise, return to step B; The maximum charging current of PMIC module setting is 1.5A;
E, by described PMIC module, obtained the electric current of charger output, and this electric current is set to the finishing rate of mobile terminal.
6. the method for Lookup protocol mobile terminal charging current according to claim 5, is characterized in that, the charging current that PMIC module arranges mobile terminal is 100mA.
7. the method for Lookup protocol mobile terminal charging current according to claim 5, is characterized in that, described step-length is 50mA.
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|---|
| JP特開2003-32910A 2003.01.31 |
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| Publication number | Publication date |
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| CN101924383A (en) | 2010-12-22 |
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