CN1302359C - Notebook type computer cell charging current-limiting adjusting device and method - Google Patents
Notebook type computer cell charging current-limiting adjusting device and method Download PDFInfo
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- CN1302359C CN1302359C CNB2004100012310A CN200410001231A CN1302359C CN 1302359 C CN1302359 C CN 1302359C CN B2004100012310 A CNB2004100012310 A CN B2004100012310A CN 200410001231 A CN200410001231 A CN 200410001231A CN 1302359 C CN1302359 C CN 1302359C
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- threshold currents
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Abstract
The present invention relates to a charging and limiting current adjusting device of a notebook computer, which comprises an external power supply, a charging module, a voltage detecting circuit and a control circuit, wherein the voltage detecting circuit detects the voltage of the external power supply. When the external power supply is in a low-voltage mode, the detecting circuit can generate a detecting signal according to a detecting result and can transmit the detecting single to the control circuit, and the control circuit makes the charging module increase the charging limiting current of a notebook computer according to the detecting signal.
Description
Technical field
The present invention relates to the device and method that a kind of threshold currents of charging is adjusted, and particularly relate to the device and method that a kind of mobile computer charging threshold currents is adjusted.
Background technology
In today of stressing movable living, mobile computer has been very general commodity.Especially need to travel the often businessperson of various places, mobile computer provides a not space-constrained working environment, no matter is on the aircraft, or on the automobile, all can enjoy the facility of mobile digital whenever and wherever possible.But mobile computer unlike desktop PC, have the stable power environment, so, can both make the running that mobile computer can be stable, also become an important problem how in the place of various kinds.
In moving, the power supply of mobile computer is normally provided by the battery of its outfit, when battery supply exhausts, just needs external power source that the running of mobile computer power supply is provided on the one hand, on the one hand to its battery charge.Please refer to Fig. 1, Fig. 1 shows mobile computer charge path figure.When mobile computer connected external power source 110, external power source 110 was understood system's 121 supply powers, and can be by 123 chargings of 129 pairs of batteries of charging module.
In general, the dc voltage that external power source need be supplied with mobile computer is 19V (most mobile computer) or 16V (mobile computer of IBM), and actual external power source mainly contains two classes, one for needing the AC power of collocation transformer use, wherein transformer is in order to transfer AC power to the direct supply of 16V or 19V, and another kind of external power source then is a direct supply.(low voltage mode of indication is meant that the dc voltage of external power source supply mobile computer is lower than 19V (with respect to most mobile computer) or 16V (with respect to the mobile computer of IBM) herein and when mobile computer is in when working under the low voltage mode, for example the dc voltage of car charging source supply mobile computer is 12V-14V, and it makes mobile computer be in work under the low voltage mode.), by following formula as can be known:
P=I * V, wherein V: outer power voltage
I: the total current that external power source provides
P: general power
The external power source total current need offer system and battery charge, but total current needs to supply with earlier the mobile computer system power, remaining electric current just offers battery charge, therefore integrated circuit (Integrated Circuit charges, IC) battery charge maximum constraints (charging threshold currents) is arranged in the function, the mobile computer system is not subjected to " charging threshold currents " restriction, this function is to avoid total load to surpass the total current that external power source can provide, therefore when total current that the threshold currents of charging provides greater than external power source, the charging integrated circuit just can be to battery charge, the magnitude of current that can supply with battery charge subtracts " mobile computer system power " for " charging threshold currents ", and the charging integrated circuit can be set a maximum current flow of supplying with battery charge, to avoid battery to burn out because of charging current is excessive, but externally the power supply general power that can provide immobilizes or when bigger, voltage decline when external power source, charging IC has the charging of setting threshold currents, known charging IC circuit does not have to adjust the design of charging threshold currents, therefore the general power that can use can reduce, but the power that mobile computer work is consumed does not change, so the general power that can provide in low-voltage can can't efficiently offer the use of mobile computer battery charge because of the charging threshold currents.Therefore will lower power, make that the speed of charging is slow excessively, can learn by following example to battery charge.
For example common external power source specification is 19V*3.42A (maximum general power is about 65W), because the flow valuve of generally rationing the power supply can not be set above external power source specification (being 3.42A at this) and set too low person and then waste the general power that external power source can be used, so at this threshold currents is preset as 3.2A.
When using general AD adapter (19V*3.42A):
3.2A*19V＝60.8W
When low-voltage (as automobile power source 12-14V):
3.2A*12V＝38.4W
Therefore when low-voltage (38.4W), can't use as the power supply general power (65W) of AD adapter, causing easily can't have enough power to offer the mobile computer battery charge to use.
Through after the improvement design, the charging flow valuve of rationing the power supply can set up on their own on demand in the charging threshold currents, can make when low-voltage, and circuit can be judged automatically and adjusts the required flow valuve of rationing the power supply.
When for example default low-voltage is adjusted threshold currents automatically and is 5A:
5A*12V=60W (can near 19V*3.2A time 60.8W)
Summary of the invention
In view of this, the purpose of this invention is to provide the device and method that a kind of mobile computer charging threshold currents is adjusted, be applicable under low voltage mode, make the charging module of mobile computer can provide mobile computer normal charging current.
Based on above-mentioned and other purpose, the present invention proposes the method that a kind of mobile computer charging threshold currents is adjusted, the method comprises sets a critical voltage (according to known technology, can set critical voltage to most mobile computer is 19V, and the mobile computer of IBM can to set critical voltage be 16V) and the voltage that detects the external power source of mobile computer, when the voltage of the external power source that detects mobile computer under the pattern of subcritical voltage, the charging integrated circuit in the charging module of control linkage mobile computer then, make the threshold currents of mobile computer strengthen, make the speed of charging module battery charge unlikely slow excessively, and voltage when the external power source that detects mobile computer, when increasing to less than critical voltage more than or equal to critical voltage, charging integrated circuit in the charging module of control linkage mobile computer makes the threshold currents of mobile computer get back to the original start value.
Described according to one embodiment of the invention, when the pattern following time of the voltage that detects external power source at subcritical voltage, will control charging integrated circuit (Integrated Circuit, IC) the control voltage on rises, control the rising of voltage by this, increase the charging threshold currents of battery, make to reach and supply with the required charging current of battery, and when the voltage of external power source that detect mobile computer, when increasing to less than critical voltage more than or equal to critical voltage, control voltage on the control charging integrated circuit descends, and controls the decline of voltage by this, recalls to the original start value of the charging threshold currents of battery.
The device that the present invention also provides a kind of mobile computer charging threshold currents to adjust comprises external power source, charging module, voltage detecting circuit and control circuit.Voltage detecting circuit wherein, can detect outside power source voltage, if the voltage of external power source is under the pattern of subcritical voltage, testing circuit can produce according to testing result and detect signal, this is detected signal deliver to control circuit, control circuit detects signal according to this, the threshold currents that the control charging module will be adjusted charging rises to suitable setting value, under can pattern because of the voltage subcritical voltage of external power source, make the battery charging rate of mobile computer slow excessively, the voltage of working as external power source then, when increasing to more than or equal to critical voltage less than critical voltage, testing circuit can produce according to testing result and detect signal, this is detected signal deliver to control circuit, control circuit detects signal according to this, and the threshold currents of control charging module adjustment charging is got back to original setting value.
In one embodiment of the invention, charging module comprises bleeder circuit and a charging IC as the aforementioned.Bleeder circuit is electrically coupled to control voltage pin and the reference voltage pin of charging IC, control circuit is according to detecting signal, can provide a control voltage to deliver to the control voltage pin of charging on the IC by the control bleeder circuit, charging IC meeting conversion and control voltage, and the battery charge threshold currents size of adjustment mobile computer.
In one embodiment of the invention, bleeder circuit comprises a variable resistor and a resistance and an electric capacity as the aforementioned.Variable-resistance two-end-point is coupled to control voltage pin and the reference voltage pin of this charging IC respectively, change resistance value by this control circuit according to detecting signal, and resistance one end and variable resistor and control voltage pin electric property coupling, the other end then with electric capacity electric property coupling and ground connection, utilize the method for dividing potential drop can controlled voltage, this control voltage is delivered on the control voltage pin of charging IC, can be adjusted the charging threshold currents size of mobile computer.
From the above, the present invention is operated in the environment of voltage subcritical voltage of external power source mobile computer, can strengthen the charging threshold currents, allow the battery charge of delivering to mobile computer, can not make the speed of mobile computer battery charge slow excessively because of the influence of the voltage subcritical voltage of external power source.
For above and other objects of the present invention, feature and advantage can be become apparent, an embodiment cited below particularly, and be described with reference to the accompanying drawings as follows.
Description of drawings
Fig. 1 shows mobile computer charge path figure;
Fig. 2 shows the mobile computer charging threshold currents adjusting gear figure according to one embodiment of the invention;
Fig. 3 shows the charging module circuit block diagram according to one embodiment of the invention;
Fig. 4 shows the bleeder circuit internal circuit calcspar according to one embodiment of the invention; And
Fig. 5 shows the method flow diagram of adjusting according to the mobile computer charging threshold currents of one embodiment of the invention.
Description of reference numerals
110,200: external power source
121,600: system
123,700: battery
129,500: charging module
300: voltage detecting circuit
400: control circuit
510: bleeder circuit
511: variable resistor
512: resistance
513: electric capacity
520: charging IC
530: detect resistance
701-705: the step of mobile computer charging current control
Embodiment
Please refer to Fig. 2, it has shown the mobile computer charging circuit calcspar according to one embodiment of the invention.The present invention mainly is made up of voltage detecting circuit 300, control circuit 400 and charging module 500.Set a critical voltage in voltage detecting circuit 300, when mobile computer connected external power source 200, system 600 was given in external power source 200 power supplies, and by 700 chargings of 500 pairs of batteries of charging module.Voltage detecting circuit 300 is coupled to external power source 200, in order to detect the power supply state of external power source 200 at any time.When the voltage of external power source 200 in the following time of state of subcritical voltage, voltage detecting circuit 300 can be sent and detect signal to control circuit 400.The control circuit 400 threshold currents increasing of can control charging modules 500 will charge this moment, so that battery 700 can be not slow excessively because of the cause charge rate of the voltage subcritical voltage of external power source 200, the voltage of working as external power source 200 then, when increasing to more than or equal to critical voltage less than critical voltage, voltage detecting circuit 300 can be sent and detect signal to control circuit 400.This moment, charging modules 500 were controlled in control circuit 400 meetings, the charging threshold currents were reverted to the value of original setting.
Please refer to Fig. 3, it shows the charging module internal circuit calcspar according to one embodiment of the invention.Charging module 500 comprises bleeder circuit 510 and charging IC 520 and detects resistance 530, wherein bleeder circuit 510 is coupled to control voltage Vcls pin and the reference voltage Vref pin of charging IC 520 respectively, and control circuit 400 can produce control voltage Vcls by control bleeder circuit 510.System 600 serial connection one detects resistance 530, and detects resistance 530 and be coupled to charging IC 520, detects resistance 530 1 and is connected to external power source 200.Simultaneously, charging IC also is coupled to battery 700, makes when system 600 is given in power supply, can be simultaneously to battery 700 chargings.The employed charging of wherein above-mentioned general mobile computer IC, there is no specific to certain model, that is different mobile computer manufacturer not necessarily uses the charging IC of same model, and the charging IC of different model just needs the different bleeder circuit of design to go correspondence, (manufacturer of the IC that wherein charges and product type are MaximMax1645B now to lift one group of charging IC that arranges in pairs or groups mutually and bleeder circuit, and its corresponding bleeder circuit can be consulted Fig. 4) do explanation for example, wherein the size of the threshold currents that bleeder circuit provided that this charging IC is corresponding with it is shown below:
When the pattern of the voltage subcritical voltage of external power source 200, control voltage Vcls can rise, because control voltage Vcls is directly proportional with the battery charge threshold currents of mobile computer, formula according to above-mentioned Max1645B charging IC, so the charging threshold currents can rise, then when the voltage of external power source 200, when increasing to less than critical voltage more than or equal to critical voltage, control voltage Vcls can descend, and the charging threshold currents can be recalled to original value.Detect resistance 530 and be and be used for the size of current that senses flow crosses, cooperate charging integrated circuit 520 to limit charging current and be no more than available charging current (available charging current=charging threshold currents-system consumption electric current), increased or surpass when rationing the power supply flow valuve as the system consumption electric current, the IC that then charges can lower or stop to make total current be no more than the flow valuve of rationing the power supply to battery charge.Please be simultaneously with reference to Fig. 4, it shows the bleeder circuit synoptic diagram according to one embodiment of the invention.Variable resistor 511 in the bleeder circuit 510 is connected with resistance 512 1 ends, the other end connects electric capacity 513, and the other end ground connection of the other end of resistance 512 and electric capacity 513, and electric capacity 513 can be considered open circuit (Open) under the state of direct current, so variable resistor 511 and resistance 512 can be considered series circuit.Control circuit 400 is adjusted the resistance value of variable resistor 511 according to detecting signal, and variable resistor one end is a reference voltage Vref, and the other end is control voltage Vcls.Control voltage Vcls is obtained by the reference voltage Vref dividing potential drop, and its charging IC formula is:
When following time of pattern of the voltage subcritical voltage of power supply 200 externally, control circuit 400 is received the detection signal, can control variable resistor 511 resistance values descend, so that control voltage Vcls rises, then when the voltage of external power source 200, when increasing to more than or equal to critical voltage less than critical voltage, control circuit 400 is received the detection signal, can control variable resistor 511 resistance values rise, so that control voltage Vcls descends.
Please referring to Fig. 5, it shows the mobile computer charging threshold currents method of adjustment process flow diagram according to one embodiment of the invention.The method of charging threshold currents of the present invention adjustment can be applicable to a mobile computer charging device, as the charging device of Fig. 3.At first, shown in step 701, when external power source is given charging module 500 (as shown in Figure 3).Shown in step 702, whether voltage detecting circuit 300 can be checked external power source 200, be the pattern (as shown in Figure 3) of the voltage subcritical voltage of external power source 200.Pattern if not the voltage subcritical voltage that is in external power source 200, then get back to step 701, and if be in the pattern of the voltage subcritical voltage of external power source 200, then shown in step 703, voltage detecting circuit 300 can be sent one and detect signal to control circuit 400, informs the charging IC 520 (as shown in Figure 3) in the control circuit 400 control charging modules 500.Shown in step 704, control circuit 400 can make the control voltage Vcls of charging IC 520 rise (as shown in Figure 3).Shown in step 705, control voltage Vcls rising can increase the charging threshold currents of mobile computer battery, so can solve under the pattern of power source voltage subcritical voltage externally the problem that charge rate is slow excessively.Shown in step 706, whether voltage detecting circuit 300 can be checked external power source 200, be the pattern (as shown in Figure 3) of the voltage subcritical voltage of external power source 200.If be in the pattern of the voltage subcritical voltage of external power source 200, then get back to step 706, if the non-pattern that is in the voltage subcritical voltage of external power source 200, then shown in step 707, voltage detecting circuit 300 can be sent one and detect signal to control circuit 400, informs the charging IC 520 (as shown in Figure 3) in the control circuit 400 control charging modules 500.Shown in step 708, control circuit 400 can make the control voltage Vcls of charging IC 520 descend (as shown in Figure 3).Shown in step 709, the charging that control voltage Vcls decline can downgrade the mobile computer battery is rationed the power supply and is flowed back to the original start value.
In sum, when the voltage that is in external power source when mobile computer is lower than a critical voltage, the device and method of adjusting with the charging threshold currents of mobile computer battery provided by the present invention, can promote the charging threshold currents of mobile computer battery, to promote the speed of mobile computer charging.
Though the present invention discloses as above with an embodiment; right its is not in order to limit the present invention; those skilled in the art can do some changes and retouching under the premise without departing from the spirit and scope of the present invention, so protection scope of the present invention is looked accompanying Claim and is as the criterion.
Claims (13)
1. the device adjusted of mobile computer charging threshold currents comprises:
One charging module, the external power source that is coupled, providing electric power to this mobile computer, and to a battery charge of this mobile computer;
One voltage detecting circuit, this external power source that is coupled so that this external power source is carried out voltage detecting, and is sent one according to testing result and is detected signal; And
One control circuit with this voltage detecting circuit and the coupling of this charging module, is controlled one of this charging module according to this detection signal and is controlled voltage, to determine the charging threshold currents of this mobile computer.
2. the device that mobile computer charging threshold currents as claimed in claim 1 is adjusted, this charging module comprises:
One detects resistance, and this external power source is coupled;
One bleeder circuit, this control circuit that is coupled, the control according to this control circuit provides this control voltage;
One charging integrated circuit, this bleeder circuit, this battery and this detection resistance are coupled, to decide the charging threshold currents of this mobile computer according to this control voltage, and this detection resistance carried out current detecting, and according to the comparative result of this current detecting result and this charging threshold currents, the magnitude of current of this battery charge is supplied with in decision.
3. the device that mobile computer charging threshold currents as claimed in claim 2 is adjusted, this bleeder circuit is electrically coupled to a control voltage pin and a reference voltage pin of this charging integrated circuit.
4. the device that mobile computer charging threshold currents as claimed in claim 3 is adjusted, this bleeder circuit comprises:
One variable resistor, two-end-point are coupled to this control voltage pin and this reference voltage pin of this charging integrated circuit respectively, and wherein this variable-resistance resistance value can be come modulation according to this detection signal by this control circuit;
One resistance, an end and this variable resistor and this control voltage pin electric property coupling, other end ground connection; And
One electric capacity, an end and this variable resistor and this reference voltage pin electric property coupling, the other end and this resistance electric property coupling and ground connection.
5. the device that mobile computer as claimed in claim 2 charging threshold currents is adjusted, when the comparison result of this current detecting result and this charging threshold currents for this threshold currents of charging greater than this current detecting as a result the time, this integrated circuit that charges is to this battery charge.
6. the device that mobile computer charging threshold currents as claimed in claim 2 is adjusted wherein should be set the maximum current flow of supplying with this battery charge by the charging integrated circuit.
7. the device that mobile computer charging threshold currents as claimed in claim 1 is adjusted, this external power source is a direct current power supply.
8. the device that mobile computer charging threshold currents as claimed in claim 1 is adjusted, this external power source comprises an AC power and a transformer.
9. the method that mobile computer charging threshold currents is adjusted is applicable to that the charging module that makes a mobile computer provides this mobile computer running and electric current required to the battery charge of this mobile computer, and this method comprises:
Set a critical voltage;
Detect the voltage of an external power source of this mobile computer; And
When this outer power voltage during, strengthen the charging threshold currents of this mobile computer less than this critical voltage.
10. the method that mobile computer charging threshold currents as claimed in claim 9 is adjusted, when detecting this outer power voltage less than this critical voltage, a control voltage of controlling on the interior charging integrated circuit of this charging module rises.
11. the method that mobile computer charging threshold currents as claimed in claim 10 is adjusted, this control voltage on this charging integrated circuit rises, in order to increase the charging threshold currents of this mobile computer.
12. the method that mobile computer charging threshold currents as claimed in claim 9 is adjusted, wherein this method also comprises when detecting this outer power voltage when increasing to more than or equal to this critical voltage less than this critical voltage, controls that the control voltage on the charging integrated circuit descends in this charging module.
13. the method that mobile computer charging threshold currents as claimed in claim 12 is adjusted, this control voltage on this charging integrated circuit descends, in order to downgrade the charging threshold currents of this mobile computer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100012310A CN1302359C (en) | 2004-01-02 | 2004-01-02 | Notebook type computer cell charging current-limiting adjusting device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100012310A CN1302359C (en) | 2004-01-02 | 2004-01-02 | Notebook type computer cell charging current-limiting adjusting device and method |
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| Publication Number | Publication Date |
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| CN1641530A CN1641530A (en) | 2005-07-20 |
| CN1302359C true CN1302359C (en) | 2007-02-28 |
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| CNB2004100012310A Expired - Fee Related CN1302359C (en) | 2004-01-02 | 2004-01-02 | Notebook type computer cell charging current-limiting adjusting device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102201681A (en) * | 2010-03-24 | 2011-09-28 | 鸿富锦精密工业（深圳）有限公司 | Power supply management system of portable computer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2395331Y (en) * | 1999-10-29 | 2000-09-06 | 上海伊迪艾电脑科技有限公司 | DC power source repairing device with high reliability |
| CN2418610Y (en) * | 1999-11-19 | 2001-02-07 | 王锡安 | Intelligent variable constant-current quick-acting charger |
| CN2456354Y (en) * | 2000-08-18 | 2001-10-24 | 伦飞电脑实业股份有限公司 | Electric changer |
-
2004
- 2004-01-02 CN CNB2004100012310A patent/CN1302359C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2395331Y (en) * | 1999-10-29 | 2000-09-06 | 上海伊迪艾电脑科技有限公司 | DC power source repairing device with high reliability |
| CN2418610Y (en) * | 1999-11-19 | 2001-02-07 | 王锡安 | Intelligent variable constant-current quick-acting charger |
| CN2456354Y (en) * | 2000-08-18 | 2001-10-24 | 伦飞电脑实业股份有限公司 | Electric changer |
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| CN1641530A (en) | 2005-07-20 |
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Granted publication date: 20070228 Termination date: 20210102 |