CN102088195B - Portable electronic device and related charging control method - Google Patents
Portable electronic device and related charging control method Download PDFInfo
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- CN102088195B CN102088195B CN 200910252063 CN200910252063A CN102088195B CN 102088195 B CN102088195 B CN 102088195B CN 200910252063 CN200910252063 CN 200910252063 CN 200910252063 A CN200910252063 A CN 200910252063A CN 102088195 B CN102088195 B CN 102088195B
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Abstract
The invention provides a portable electronic device and a related charging control method. The portable electronic device comprises a battery power supply module and a charge control circuit, wherein the battery power supply module is used for being connected with a battery so as to utilize the battery as a power supply of the portable electronic device; the charge control circuit is used for carrying out charge control on the battery; the charge control circuit monitors a charge fitting of the portable electronic device to be input to a voltage level of the portable electronic device; and when the insufficiency of the voltage level is detected, the charge control circuit dynamically regulates a charge current applied to the battery by the portable electronic device so as to prevent the inferior quality of the charge fitting obstructing the charging operation of the portable electronic device. The invention also provides the related charging control method.
Description
Technical field
The invention relates to the power management of portable electron device, the espespecially a kind of portable electron device of accessory quality variation obstruction charging running and relevant charge control method of not being subjected to.
Background technology
Generally speaking, portable electron device is provided with battery as power supply such as mobile phone or personal digital assistant (PersonalDigital Assistant, PDA), and the user can be charged by specialty cables or transformer usually.For example: possess USB (Universal Serial Bus, USB) portable electron device can install such as personal computer (Personal Computer by corresponding USB (universal serial bus) port (USB Port) and other, PC) link to each other, in order to carry out the communication between the stream oriented device or carry out the charging of portable electron device.Yet, have on the market that many USB cable qualities are bad, internal resistance value is excessive, so the received charging voltage of the USB (universal serial bus) port of portable electron device is on the low side; This tends to cause the portable electron device erroneous judgement, and it is complete to judge that battery has charged, and just stops charging.
The user is former should to adopt qualified USB cable, to guarantee communication and charging quality; Yet the USB cable that the user chooses on the market voluntarily is unavoidable, and the problem that stops to charge so the bad USB cable of quality causes the portable electron device erroneous judgement just constantly occurs.
Similarly, have on the market that many transformer qualities are bad, internal resistance value is excessive, so the received charging voltage of portable electron device also can be on the low side; This tends to cause the portable electron device erroneous judgement, and it is complete to judge that battery has charged, and just stops charging.So the bad transformer of quality causes portable electron device erroneous judgement and the problem that stops to charge also constantly occurs.Prior art haves much room for improvement really.
Summary of the invention
Therefore one of purpose of the present invention is to provide a kind of portable electron device of accessory quality variation obstruction charging running and relevant charge control method of not being subjected to, to address the above problem.
A kind of portable electron device is provided in the preferred embodiment of the present invention, and this portable electron device is not subjected to the accessory quality to change obstruction charging running, and this portable electron device comprises a battery supply supply module and a charging control circuit.This battery supply supply module is used for connecting a battery, to utilize this battery as the power supply of this portable electron device.In addition, this charging control circuit is used for for the control of charging of this battery, wherein this charging control circuit charging accessory of monitoring this portable electron device inputs to the voltage quasi position of this portable electron device, and when detecting this voltage quasi position deficiency, this charging control circuit is dynamically adjusted the charging current that this portable electron device puts on this battery, hinders the charging running of this portable electron device with the bad quality of avoiding this charging accessory.
The present invention also provides a kind of relevant charge control method accordingly when above-mentioned portable electron device is provided, this charge control method includes: the charging accessory of monitoring a portable electron device inputs to the voltage quasi position of this portable electron device; And when detecting this voltage quasi position deficiency, dynamically adjust the charging current that this portable electron device puts on its battery, hinder the charging running of this portable electron device with the bad quality of avoiding this charging accessory.
One of benefit of the present invention is, in case the user adopts the charging accessory of buying by oneself, especially bad higher USB (the Universal Serial Bus of charging accessory such as internal resistance value of quality, USB) cable or transformer, the present invention can avoid the bad quality of this charging accessory to hinder the charging running of this portable electron device.
Another benefit of the present invention is, put in the process of charging current of its battery in dynamically adjusting this portable electron device, by the predetermined value that optionally this charging current is increased a grade, the present invention can finish the charging running as quickly as possible under the prerequisite of constant charge.Therefore, the present invention can positively reach the stable again target of efficient charging when the problem that solves prior art.
Description of drawings
Fig. 1 for according to the present invention one first embodiment a kind of schematic diagram that is not subjected to the accessory quality change to hinder the portable electron device of charging running;
Fig. 2 is the flow chart according to a kind of charge control method of one embodiment of the invention;
Fig. 3 is the schematic diagram of the implementation detail of charge control method in an embodiment shown in Figure 2;
Fig. 4 is the schematic diagram of the charging curve of charge control method in an embodiment shown in Figure 2;
Fig. 5 is the schematic diagram of the charging curve of charge control method in another embodiment shown in Figure 2;
Fig. 6 is that portable electron device shown in Figure 1 is in the schematic diagram of one second embodiment.
Drawing reference numeral
100 portable electron devices
105 batteries
110 battery supply supply modules
120 charging control circuits
510,520,530 charging currents change
910 charge control methods
912,914,922,924,926,928,932,934,936 steps
920 workflows
I
ChargeCharging current
I
CableThe cable electric current
R
CableThe internal resistance value of cable
V
HostVoltage quasi position
V
SystemThe charging accessory of portable electron device
Input to this portable electron device
Voltage quasi position
Embodiment
Please refer to Fig. 1, Fig. 1 is a kind of schematic diagram that is not subjected to the accessory quality to change the portable electron device 100 of obstruction charging running according to the present invention one first embodiment.For example: portable electron device 100 can represent mobile phone or personal digital assistant (Personal Digital Assistant, PDA).Again for example: portable electron device 100 can represent laptop computer (Laptop Computer).Again for example: portable electron device 100 represents portable media player such as the MP3 player.
As shown in Figure 1, portable electron device 100 comprises a battery supply supply module 110 and a charging control circuit 120, and wherein battery supply supply module 110 is to connect a battery 105, in order to the power supply of using battery 105 as portable electron device 100.For example: aspect structure arrangement, battery 105 is embedded in battery supply supply module 110, and battery supply supply module 110 can comprise battery 105 is fixed in the structure of portable electron device 100, and can comprise in addition to be electrically connected the terminal of battery 105.Again for example: aspect structure arrangement, the part of battery 105 exposes to a side of portable electron device 100, and battery supply supply module 110 can comprise battery 105 is fixed in the structure of portable electron device 100, and can comprise in addition to be electrically connected the terminal of battery 105.Note that the viewpoint from circuit, battery supply supply module 110 is rear classes of battery 105, so in Fig. 1, the function square of battery 105 is not illustrated within the function square of battery supply supply module 110.
On the implementation, charging control circuit 120 can in have procedure code 120P (not shown), be used as the basis of the various controls running of charging control circuit 120, wherein the charging control circuit 120 of program code 120P is used for for battery 105 control of charging.For example: charging control circuit 120 represents a hardware control, and procedure code 120P can be the rom program code (ROM Code) that is embedded in this hardware control.Yet this is not limitation of the present invention only for illustrative purposes.Change example according to one of present embodiment, charging control circuit 120 represents a micro-control unit (Micro ControlUnit, MCU), and procedure code 120P can be the performed firmware program code of this micro-control unit, and wherein charging control circuit 120 can carry out the control of the various runnings except the charging running in addition.Another variation example according to present embodiment, charging control circuit 120 represents a microprocessing unit (Micro ProcessingUnit, MPU), and procedure code 120P can be the performed software code of this microprocessing unit, and wherein charging control circuit 120 can carry out the control of the various runnings except the charging running in addition.Change example according to another of present embodiment, charging control circuit 120 is comprised of logical circuit.
According to present embodiment, the charging accessory that charging control circuit 120 can be monitored portable electron device 100 inputs to the voltage quasi position V of portable electron device 100
SystemWhen detecting voltage quasi position V
SystemWhen not enough, charging control circuit 120 is dynamically adjusted the charging current I that portable electron device 100 puts on battery 105
Charge, hinder the charging running of portable electron device 100 with the bad quality of avoiding this charging accessory.Correlative detail please refer to Fig. 2 and further specifies.
Fig. 2 is that wherein charge control method 910 can be applicable to portable electron device shown in Figure 1 100 according to the flow chart of a kind of charge control method 910 of one embodiment of the invention.Charge control method 910 is described as follows.
Step 912: the charging accessory of charging control circuit 120 (the especially charging control circuit 120 of program code 120P) monitoring portable electron device 100 inputs to the voltage quasi position V of portable electron device 100
System, wherein the detecting unit (not shown) in the charging control circuit 120 can detect voltage quasi position V
System, monitor for charging control circuit 120.For example: this charging accessory can represent a USB (Universal Serial Bus, USB) cable, and voltage quasi position V
SystemThen represent the voltage quasi position that the USB end (USB Port) of portable electron device 100 receives from this USB cable.Yet this is not limitation of the present invention only for illustrative purposes.Change example according to one of present embodiment, this charging accessory can represent a transformer.
Step 914: when detecting voltage quasi position V
SystemWhen not enough, charging control circuit 120 is dynamically adjusted the charging current I that portable electron device 100 puts on its battery 105
Charge, hinder the charging running of portable electron device 100 with the bad quality of avoiding this charging accessory.In present embodiment, the internal resistance value that the bad quality of this charging accessory represents this charging accessory reaches a predetermined value.For example: the internal resistance value of normal USB cable is about 0.4 ohm (Ohm), and the distribution of the internal resistance value of the USB cable of inferior quality is approximately 1 ohm to 3 ohm; Its poorer person's internal resistance value even can reach 4 ohm.
According to present embodiment, at above-mentioned USB cable and the voltage quasi position V of this charging accessory representative
SystemRepresent under the situation of the voltage quasi position that this USB (universal serial bus) port receives from this USB cable given main device (Host Device) voltage quasi position V
HostRepresent this USB cable from main device such as a personal computer (Personal Computer, PC) voltage quasi position that receives, the voltage of the USB system that then is formed by connecting by this main device, this USB cable, with portable electron device 100 distributes and can represent according to following equation:
V
Host＝V
Cable+V
System；
V wherein
CableRepresent the voltage that this USB cable consumes.
Known:
V
Cable=I
Cable* R
Cable, I wherein
CableWith R
CableRepresent respectively cable electric current and internal resistance value in this USB cable;
So, according to the equation that above-mentioned voltage distributes, voltage quasi position V
SystemThe order that can followingly establish an equation represents:
V
System＝V
Host-V
Cable
＝V
Host-I
Cable*R
Cable；
Work as V
Host=5 volts (Volt, V), I
CableBe 200 milliampere (milliampere, mA) and R
CableWhen being 2.5 ohm (Ohm), voltage quasi position V then
SystemCan be calculated as follows:
V
System＝5-200/1000*2.5
＝5-0.5
＝4.5(V)；
That is to say that the loss of voltage that this USB cable causes is very large.This tends to cause traditional portable electron device erroneous judgement in the middle of prior art, and it is complete to judge that battery has charged, and just stops charging.Compared to prior art, portable electron device 100 provided by the present invention and relevant charge control method 910 just can not be subjected to the accessory quality to change obstruction charging running.Especially, in step 914, charging control circuit 120 is dynamically adjusted the charging current I that portable electron device 100 puts on its battery 105
Charge, the loss of voltage that is caused to reduce this USB cable.
Under typical situation, charging current I
ChargeBe less than or equal to the cable electric current I
Cable, wherein charging control circuit 120 is dynamically adjusted charging current I
ChargeWill dynamically adjust the cable electric current I
CableBecause in general charging process, the user can specially not take up use with portable electron device 100, and the terminal that each in the battery supply supply module 110 is used for being electrically connected battery 105 all possesses the quality that meets related specifications, so that the electric current that is additionally expended outside the charging running levels off to is zero.For brevity, in present embodiment, can make charging current I
ChargeEqual the cable electric current I
CableSo, detecting voltage quasi position V
SystemUnder the not enough situation, charging control circuit 120 can reduce charging current I limitedly
Charge(be to reduce the cable electric current I at this limitedly
Cable), to increase voltage quasi position V
System
According to some special cases of present embodiment, charge control method 910 shown in Figure 2 comprises in addition: for charging current I
ChargeAdjustment, provide the predetermined value/preset range of a plurality of grades for selecting; So, for charging current I
ChargeAdjustment, charging control circuit 120 has the predetermined value/preset range of these a plurality of grades for selecting.Detecting voltage quasi position V
SystemUnder the not enough situation, charging control circuit 120 is optionally with charging current I
ChargeDowngrade the predetermined value/preset range of a grade, unless charging current I
ChargeReached the predetermined value/preset range of the lowest class.In addition, keep stable and voltage quasi position V did not occur within a scheduled time in the charging running that detects portable electron device 100
SystemUnder the not enough situation, charging control circuit 120 is optionally with charging current I
ChargeIncrease the predetermined value/preset range of a grade, unless charging current I
ChargeReached the predetermined value/preset range of highest ranking.Therefore, the present invention can positively reach the stable again target of efficient charging when the problem that solves prior art.
Fig. 3 is the schematic diagram of the implementation detail of charge control method 910 in an embodiment shown in Figure 2, and wherein present embodiment can be any one in all special cases described above of some special cases embodiment illustrated in fig. 2.For example: this scheduled time is 5 minutes, and the spacing of the predetermined value of these a plurality of grades is identical and be 25 milliamperes (mA), wherein the predetermined value of above-mentioned the lowest class just in time is 25 milliamperes, and the predetermined value of above-mentioned highest ranking then is 250 milliamperes; That is to say that charging control circuit 120 can be with charging current I
ChargeDynamically be adjusted into these a plurality of grades predetermined value 25,50,75 ..., any one in the middle of the 250}.Again for example: this scheduled time is 5 minutes, and the spacing of the preset range of these a plurality of grades is roughly the same and be approximately 25 milliamperes, wherein the representative of the preset range of above-mentioned the lowest class is approximately the scope of 25 milliamperes, and the preset range of above-mentioned highest ranking then represents the scope that is approximately 250 milliamperes; That is to say that charging control circuit 120 can be with charging current I
ChargeBe dynamically adjusted to respectively and be approximately 25,50,75 ..., any one in the middle of the preset range of a plurality of grades of 250}.Workflow 920 shown in Figure 3 is described as follows:
Step 922: charging control circuit 120 (the especially charging control circuit 120 of program code 120P) detects voltage quasi position V
SystemWhether unstable.As voltage quasi position V
SystemUnstable, then enter step 924; Otherwise, enter step 932.
Step 924: charging control circuit 120 detects charging current I
ChargeWhether greater than 25 milliamperes.As charging current I
ChargeGreater than 25 milliamperes, then enter step 926; Otherwise, reenter step 922.
Step 926: charging control circuit 120 is with charging current I
ChargeReduce by 25 milliamperes.
Step 928: whether charging control circuit 120 detects battery 105 and is full of.When battery 105 has been full of, then power cut-off flow process 920; Otherwise, reenter step 922.
Step 932: charging control circuit 120 detects voltage quasi position V
SystemWhether stablize and reach 5 minutes.As voltage quasi position V
SystemStable reach 5 minutes, then enter step 934; Otherwise, reenter step 922.
Step 934: charging control circuit 120 detects charging current I
ChargeWhether reach 250 milliamperes.As charging current I
ChargeReach 250 milliamperes, then reenter step 922; Otherwise, enter step 936.
Step 936: charging control circuit 120 is with charging current I
ChargeIncrease by 25 milliamperes.After execution in step 936, reenter step 922.
Since in the charging process of reality, charging current I
ChargeSize may float, may not be certain to maintain the predetermined value/preset range of some grades.Therefore, workflow 920 shown in Figure 3 can be divided into several strategies and illustrates on implementation detail.
According to one first strategy, in the middle of the workflow 920 whenever with charging current I
ChargeWhen reducing 25 milliamperes (being step 926) or increasing by 25 milliamperes (being step 936), the benchmark that reduces or increase is that predetermined value with present grade is as starting point.That is to say, no matter charging current I
ChargeSize whether maintain the predetermined value/preset range of present grade, in case step 926 is performed, charging control circuit 120 can be with charging current I
ChargeReduce by 25 milliamperes from the predetermined value of present grade; Similarly, no matter charging current I
ChargeSize whether maintain the predetermined value/preset range of present grade, in case step 936 is performed, charging control circuit 120 can be with charging current I
ChargeIncrease by 25 milliamperes from the predetermined value of present grade.
According to one second strategy, in the middle of the workflow 920 whenever with charging current I
ChargeWhen reducing 25 milliamperes (being step 926) or increasing by 25 milliamperes (being step 936), the benchmark that reduces or increase is with charging current I
ChargePresent numerical value is as starting point.That is to say, no matter charging current I
ChargeSize whether maintain the predetermined value/preset range of present grade, in case step 926 is performed, charging control circuit 120 can be with charging current I
ChargeReduce by 25 milliamperes from present numerical value; Similarly, no matter charging current I
ChargeSize whether maintain the predetermined value/preset range of present grade, in case step 936 is performed, charging control circuit 120 can be with charging current I
ChargeIncrease by 25 milliamperes from present numerical value.
According to other strategy, in the middle of the workflow 920 whenever with charging current I
ChargeWhen reducing 25 milliamperes (being step 926) or increasing by 25 milliamperes (being step 936), the benchmark that reduces or increase can adopt first, second tactful hybrid plan.For example: whenever step 926 employing the first strategy, and whenever step 936 adopts the second strategy; Again for example: whenever step 926 employing the second strategy, and whenever step 936 adopts the first strategy; Again for example: whenever the predetermined value/preset range of the highest or the lowest class adopts the first strategy, and whenever the predetermined value/preset range of other grade adopts the second strategy.Again for example: adopt at random first, second strategy.
Fig. 4 is the schematic diagram of the charging curve of charge control method 910 in an embodiment shown in Figure 2, and wherein present embodiment is special case one of embodiment illustrated in fig. 3.As shown in Figure 4, the left side of this charging curve shows that the spacing of predetermined value of these a plurality of grades is identical.The charging control circuit 120 that note that present embodiment all has been exposed in embodiment shown in Figure 3 for the relevant control of charge control method shown in Figure 2 910.
Fig. 5 is the schematic diagram of the charging curve of charge control method 910 in another embodiment shown in Figure 2, and wherein present embodiment is special case one of embodiment illustrated in fig. 3.Present embodiment specially illustrates out with the noise that suffers from the implementation in the lump, so this charging curve seems not to be very smooth-going.As shown in Figure 5, the left side of this charging curve shows that the spacing of the predetermined value of these a plurality of grades is not quite similar, so can be considered the preset range of several grades.For example: charging current changes 510 and 520 and points out that the spacing of predetermined value of corresponding continuous Three Estate is different each other, so can be considered the preset range of several grades.Again for example: charging current changes 520 and 530 and points out that the spacing of the predetermined value of corresponding continuous several grades is not quite similar each other, so can be considered the preset range of several grades.The charging control circuit 120 that note that present embodiment all has been exposed in embodiment shown in Figure 3 for the relevant control of charge control method shown in Figure 2 910.
Fig. 6 is that portable electron device 100 shown in Figure 1 is in the schematic diagram of one second embodiment.Present embodiment is the variation example of this first embodiment, and wherein main device shown in Figure 1 is replaced and is transformer.The cable that note that present embodiment can be above-mentioned USB cable or is the cable of this transformer itself.
For example: be that this transformer can comprise under the situation of above-mentioned USB cable at this cable: a USB (universal serial bus) port is used for connecting this USB cable, with by this USB cable output power.In addition, voltage quasi position V
SystemRepresent the voltage quasi position that the USB (universal serial bus) port of portable electron device 100 receives from this USB cable.In addition, present embodiment can make voltage quasi position V
HostRepresent the voltage quasi position that this USB cable receives from the USB (universal serial bus) port of this transformer.
Again for example: be under the situation of cable of this transformer itself at this cable, then do not need extra USB cable.In addition, voltage quasi position V
SystemRepresent the USB (universal serial bus) port of portable electron device 100 from the voltage quasi position that cable received of this transformer itself.In addition, present embodiment can make voltage quasi position V
HostRepresent the voltage quasi position that the cable of this transformer itself receives from the internal terminal (for example pad of plain conductor within the body of this transformer in this cable) of the body of this transformer.
So, no matter the cable of present embodiment is above-mentioned USB cable or is the cable of this transformer itself, the voltage of the system that then is formed by connecting by this transformer, this cable, with portable electron device 100 distributes and can represent according to following equation:
V
Host＝V
Cable+V
System；
V wherein
CableRepresent the voltage that this cable consumes.
In addition, V
Cable=I
Cable* R
Cable, I wherein
CableWith R
CableRepresent respectively cable electric current and internal resistance value in this cable.For brevity, present embodiment and the routine similar part of aforementioned each embodiment/variation no longer repeat to give unnecessary details.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (8)
1. a portable electron device is characterized in that, described portable electron device is not subjected to the accessory quality to change obstruction charging running, and described portable electron device includes:
One battery supply supply module is used for connecting a battery, to utilize described battery as the power supply of described portable electron device; And
One charging control circuit, be used for for the control of charging of described battery, the charging accessory that wherein said charging control circuit is monitored described portable electron device inputs to the voltage quasi position of described portable electron device, and when detecting described voltage quasi position deficiency, described charging control circuit is dynamically adjusted the charging current that described portable electron device puts on described battery, reaches the charging running that a predetermined value hinders described portable electron device with the internal resistance value of avoiding described charging accessory;
Wherein, the charging accessory is the arbitrary and combination of USB or transformer.
2. portable electron device as claimed in claim 1 is characterized in that, under the situation that detects described voltage quasi position deficiency, described charging control circuit reduces described charging current limitedly, to increase described voltage quasi position.
3. portable electron device as claimed in claim 2 is characterized in that, for the adjustment of described charging current, described charging control circuit has the predetermined value/preset range of a plurality of grades for selecting; And under the situation that detects described voltage quasi position deficiency, described charging control circuit optionally downgrades described charging current the predetermined value/preset range of one grade, unless described charging current has reached the predetermined value/preset range of the lowest class.
4. portable electron device as claimed in claim 3, it is characterized in that, keep stablizing and within a scheduled time, not occuring under the situation of described voltage quasi position deficiency in the charging running that detects described portable electron device, described charging control circuit optionally increases described charging current the predetermined value/preset range of one grade, unless described charging current has reached the predetermined value/preset range of highest ranking.
5. a charge control method is characterized in that, described charge control method includes:
The charging accessory of monitoring a portable electron device inputs to the voltage quasi position of described portable electron device; And
When detecting described voltage quasi position deficiency, dynamically adjust the charging current that described portable electron device puts on its battery, reach the charging running that a predetermined value hinders described portable electron device with the internal resistance value of avoiding described charging accessory;
Wherein, the charging accessory is the arbitrary and combination of USB or transformer.
6. charge control method as claimed in claim 5 is characterized in that, described charge control method includes in addition:
Under the situation that detects described voltage quasi position deficiency, reduce described charging current, to increase described voltage quasi position limitedly.
7. charge control method as claimed in claim 6 is characterized in that, described charge control method includes in addition:
For the adjustment of described charging current, provide the predetermined value/preset range of a plurality of grades for selecting; And
Under the situation that detects described voltage quasi position deficiency, optionally described charging current is downgraded the predetermined value/preset range of a grade, unless described charging current has reached the predetermined value/preset range of the lowest class.
8. charge control method as claimed in claim 7 is characterized in that, charge control method includes in addition:
Keep stablizing and within a scheduled time, not occuring under the situation of described voltage quasi position deficiency in the charging running that detects described portable electron device, optionally described charging current is increased the predetermined value/preset range of a grade, unless described charging current has reached the predetermined value/preset range of highest ranking.
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| CN 200910252063 CN102088195B (en) | 2009-12-08 | 2009-12-08 | Portable electronic device and related charging control method |
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| CN107204636A (en) * | 2016-03-16 | 2017-09-26 | 德业科技股份有限公司 | Cell voltage is detected in charging process to adjust the charging method of supply current |
| CN107733021B (en) * | 2017-10-24 | 2020-06-02 | 北京小米移动软件有限公司 | Control method and device of electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101154824A (en) * | 2006-09-29 | 2008-04-02 | 亚源科技股份有限公司 | Charger circuit with output voltage compensation |
| CN100437126C (en) * | 2005-10-20 | 2008-11-26 | 鸿富锦精密工业（深圳）有限公司 | Voltage detector of universal serial bus interface |
| CN101340105A (en) * | 2007-07-05 | 2009-01-07 | 三星电子株式会社 | Apparatus and method of recharging a battery using a usb device in a portable device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100437126C (en) * | 2005-10-20 | 2008-11-26 | 鸿富锦精密工业（深圳）有限公司 | Voltage detector of universal serial bus interface |
| CN101154824A (en) * | 2006-09-29 | 2008-04-02 | 亚源科技股份有限公司 | Charger circuit with output voltage compensation |
| CN101340105A (en) * | 2007-07-05 | 2009-01-07 | 三星电子株式会社 | Apparatus and method of recharging a battery using a usb device in a portable device |
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