CN104158267A - Charging method and device for battery - Google Patents
Charging method and device for battery Download PDFInfo
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- CN104158267A CN104158267A CN201410440768.0A CN201410440768A CN104158267A CN 104158267 A CN104158267 A CN 104158267A CN 201410440768 A CN201410440768 A CN 201410440768A CN 104158267 A CN104158267 A CN 104158267A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a charging method and device for a battery and belongs to the field of battery charging. The method includes the steps that the voltage of the battery end is obtained and compared with a constant-current charging voltage threshold value; when the voltage of the battery end is larger than or equal to the constant-current charging voltage threshold value, the base current of a triode is adjusted, so that the base current of the triode is larger than the ratio of the rated output current of a standard charger to the amplification factor of the triode; when the base current of the triode is larger than the ratio of the rated output current of the standard charger to the amplification factor of the triode, the triode works in a saturated state small in equivalent resistance due to the current-limiting function of the charger, and heat generated by working of the triode can be reduced at a constant-current charging stage unchangeable in charging current.
Description
Technical field
The present invention relates to battery charging field, relate in particular to a kind of method for charging batteries and device.
Background technology
At present, the electronic equipment such as mobile phone, panel computer mainly adopts Rechargeable battery as electric supply installation.In the time charging the battery, conventional charging modes is linear-charging.Fig. 1 is prior art neutral line charging interval-battery terminal voltage curve.As shown in Figure 1, according to the difference of battery terminal voltage state, linear-charging is mainly divided into trickle charge, constant current charge, constant voltage charge three phases.When battery is during in complete discharge condition, battery terminal voltage is extremely low, now needs battery to carry out restorative charging, carries out trickle charge with less charging current; When battery terminal voltage reaches constant current charge voltage threshold when above, improve charging current and carry out constant current charge; When battery terminal voltage reaches constant voltage charge voltage threshold when above, keep the output voltage of charger constant, carry out constant voltage charge.In linear charging process, the output voltage of charger remains unchanged, and Power Management Unit (PMU) is controlled the voltage that is applied to battery two ends.
Fig. 2 is a kind of electronic devices structure figure that adopts linear-charging mode in prior art.As shown in Figure 2, charger E is connected with battery B by Power Management Unit P, realizes the charging of charger E to battery B.Particularly, Power Management Unit P comprises controller C, triode S, base current Circuit tuning D and analog to digital converter A1, A2.One analog to digital converter A1 one end is connected with the power pins of charger E, realizes the sampling to charger E output voltage; The other end is connected with controller C, by sampled result input control device C, to realize the detection of controller C to charger E output voltage.One analog to digital converter A2 one end is connected with the power pins of battery B, realizes the sampling to battery terminal voltage; The other end is connected with controller C, by sampled result input control device C, to realize the detection of controller C to battery terminal voltage.Transistor collector is connected with the power pins of charger E, and transistor emitter is connected with the power pins of battery B, and triode S is connected in charging circuit by the mode of series connection; Power Management Unit P controls transistor base electric current by base current Circuit tuning D, thereby controls by transistor collector electric current, and then controls the charging current in charging circuit.Triode S is operated in amplification region, in undersaturated condition, has electric current amplification.When detecting battery terminal voltage, Power Management Unit P reaches constant current charge voltage threshold when above, by regulating transistor base electric current, make transistor base electric current equal the ratio of standard configuration charger output-current rating and triode multiplication factor, thereby carry out constant current charge.The maximum output current that now transistor collector electric current is charger, the maximum output current that charging current is charger.By the control to transistor base electric current, can realize at electronic equipment end the restriction of charging current, thereby provide safely protection for charging.Now, the maximum output current of charger E is the restriction charging current of electronic equipment.
Fig. 3 is prior art neutral line charging interval-charging current curve.As shown in Figure 3, in linear charging process, the used time in constant current charge stage is the longest, charging current maximum.Triode S is for a long time in large current work state, and the heat of generation is higher, and this is to cause the higher one of the main reasons of temperature in electronic equipment charging process.
Summary of the invention
The embodiment of the present invention provides a kind of method for charging batteries and device, does not reduce charging current in the constant current charge stage, the heat having produced while having reduced triode work.
The embodiment of the present invention provides a kind of method for charging batteries, comprising:
Obtain battery terminal voltage;
Relatively battery terminal voltage and constant current charge voltage threshold;
In the time that battery terminal voltage is more than or equal to constant current charge voltage threshold, regulate transistor base electric current, make transistor base electric current be greater than the ratio of standard configuration charger output-current rating and triode multiplication factor.
The embodiment of the present invention also provides a kind of battery charger, comprising:
Detecting unit, for obtaining battery terminal voltage;
Comparing unit, for comparing battery terminal voltage and constant current charge voltage threshold;
Regulon, when being more than or equal to constant current charge voltage threshold when battery terminal voltage, regulates transistor base electric current, makes transistor base electric current be greater than the ratio of standard configuration charger output-current rating and triode multiplication factor.
In the time that battery terminal voltage is more than or equal to constant current charge voltage threshold, to battery, charging need to enter the constant current charge stage.
In prior art, by regulating the base current of triode, make transistor base electric current equal the ratio of standard configuration charger output-current rating and triode multiplication factor, thereby enter the constant current charge stage.Now triode is operated in undersaturated condition, is maintained the maximum output current of charger by the charging current of transistor collector.
In embodiments of the present invention, by regulating the base current of triode, make transistor base electric current be greater than the ratio of standard configuration charger output-current rating and triode multiplication factor, thereby enter the constant current charge stage.Due to the current-limiting function of charger, between the base current of triode and collector current, do not meet the multiplication factor of triode, make triode be operated in saturation condition.Be less than the triode equivalent resistance in undersaturated condition in the triode equivalent resistance of saturation condition, due to the current-limiting function of charger, be still maintained the maximum output current of charger by the charging current of transistor collector.
In the constant current charge stage, identical with the charging current by triode in prior art by the charging current of triode in the embodiment of the present invention, but the equivalent resistance of triode is less than the equivalent resistance of triode in prior art in the embodiment of the present invention, so the embodiment of the present invention can reduce the heat that triode work produces.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly introduced, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is prior art neutral line charging interval-battery terminal voltage curve;
Fig. 2 is a kind of electronic devices structure figure that adopts linear-charging mode in prior art;
Fig. 3 is prior art neutral line charging interval-charging current curve;
Fig. 4 is voltage across poles-collector current curve in triode;
A kind of method for charging batteries flow chart that Fig. 5 provides for the embodiment of the present invention;
The another kind of method for charging batteries flow chart that Fig. 6 provides for the embodiment of the present invention;
The another kind of method for charging batteries flow chart that Fig. 7 provides for the embodiment of the present invention;
A kind of battery charger structure chart that Fig. 8 provides for the embodiment of the present invention.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 2 is a kind of electronic devices structure figure that adopts linear-charging mode in prior art.As shown in Figure 2, charger E is connected with battery B by Power Management Unit P, realizes the charging of charger E to battery B.
Particularly, Power Management Unit P comprises controller C, triode S, base current Circuit tuning D and analog to digital converter A1, A2.Transistor collector is connected with the power pins of charger E, and transistor emitter is connected with the power pins of battery B, and triode S is connected in charging circuit by the mode of series connection.Power Management Unit P, by base current adjustment unit control transistor base electric current, passes through transistor collector electric current thereby control, and then controls the charging current in charging circuit.Triode S is operated in undersaturated condition, has electric current amplification.
Particularly, in Power Management Unit, an analog to digital converter A1 one end is connected with the power pins of charger E, realizes the sampling to charger output voltage; The other end is connected with controller C, by sampled result input control device C, to realize the detection of controller C to charger output voltage.
Particularly, in Power Management Unit, an analog to digital converter A2 one end is connected with the power pins of battery B, realizes the sampling to battery terminal voltage; The other end is connected with controller C, by sampled result input control device C, to realize the detection of controller C to battery terminal voltage.
When detecting battery terminal voltage, Power Management Unit P reaches constant current charge voltage threshold when above, by regulating transistor base electric current, make transistor base electric current equal the ratio of standard configuration charger output-current rating and triode multiplication factor, the maximum output current that now transistor collector electric current is charger, be that charging current is the maximum output current of charger, thereby carry out constant current charge.
A kind of method for charging batteries flow chart that Fig. 5 provides for the embodiment of the present invention.As shown in Figure 5, the method for charging batteries that the embodiment of the present invention provides comprises:
101, obtain battery terminal voltage;
Particularly, in charging circuit, have an analog to digital converter A2 one end to be connected with the power pins of battery B, to realize the sampling to battery terminal voltage, this analog to digital converter A2 other end is connected with controller C, by sampled result input control device C, to realize the detection of controller C to battery terminal voltage.Controller C detects battery terminal voltage by analog to digital converter (ADC), can obtain the voltage of battery-end.
102, compare battery terminal voltage and constant current charge voltage threshold;
Particularly, constant current charge voltage threshold is known, is that manufacturer determines according to the concrete electrical quantity of charger and electronic equipment, and is conventionally preset in controller C.
In areal, electronic industry is followed identical standard, and the constant current charge voltage threshold of the electronic equipment of same type is identical, and constant current charge voltage threshold also can be determined according to industry standard.
For example, in the time buying mobile phone, the standard configuration charger that mobile phone manufacturer provides for mobile phone, its input voltage: AC 100-240V～50/60HZ, output voltage: DC 5.0V---1000mA, the alternating current voltage scope that represents the reception of this charger for mobile phone be 100V between 240V, the frequency of alternating current is 50HZ or 60HZ; The rated output voltage of this charger for mobile phone is 5V, and maximum output current is 1000mA.The mobile phone that uses the type charger, its constant current charge voltage threshold is 2.8-3.2V.
103, in the time that battery terminal voltage is more than or equal to constant current charge voltage threshold, regulate transistor base electric current, make transistor base electric current be greater than the ratio of standard configuration charger output-current rating and triode multiplication factor.
By the controller C of Power Management Unit (PMU), can change transistor base electric current.Triode is current control device, and due to triode, S is connected in charging circuit, so the charging current of triode S in can control inputs battery.Particularly, triode has the effect that electric current amplifies, and in the amplification region of triode, transistor emitter adds forward voltage, and transistor collector adds after reverse voltage conducting, transistor base Current Control transistor collector electric current.Add that at transistor base a little electric current can cause triode S current collection High-current output, transistor base electric current and transistor collector electric current are similar to linear relationship, between transistor base electric current and transistor collector electric current, have more fixing proportionate relationship, this proportionate relationship is the multiplication factor of triode.In each concrete triode, the multiplication factor of triode is known.
In prior art, linear-charging time m-battery terminal voltage curve as shown in Figure 1, according to the difference of battery terminal voltage state, linear-charging is mainly divided into trickle charge, constant current charge, constant voltage charge three phases.When battery is during in complete discharge condition, battery terminal voltage is extremely low, now needs battery to carry out restorative charging, carries out trickle charge with less charging current; When battery terminal voltage reaches constant current charge voltage threshold when above, improve charging current and carry out constant current charge; When battery terminal voltage reaches constant voltage charge voltage threshold when above, keep the output voltage of charger constant, carry out constant voltage charge.
Particularly, according to the comparative result of step 102, in the time that battery terminal voltage is more than or equal to constant current charge voltage threshold, represent that the trickle charge stage of linear-charging has finished or do not needed to carry out trickle charge, battery need to carry out constant current charge.Certainly, battery is charged and can in time sequencing, not follow trickle charge, constant current charge, constant voltage charge three phases completely, this programme is not only applied in linear-charging process, this programme is for this situation of when charging current constant, no matter current constant while making to charge due to which kind of reason or the design of which kind of charging modes.The linear-charging technical scheme of introducing in background technology can not be interpreted as the restriction to this programme.
Standard configuration charger output-current rating is known.For example, in the time buying mobile phone, the standard configuration charger that mobile phone manufacturer provides for mobile phone, its input voltage: AC 100-240V～50/60HZ, output voltage: DC5.0V---1000mA, the alternating current voltage scope that represents the reception of this charger for mobile phone be 100V between 240V, the frequency of alternating current is 50HZ or 60HZ; The rated output voltage of this charger for mobile phone is 5V, and maximum output current is 1000mA.Use this standard configuration charger charging, standard configuration charger output-current rating is 1000mA.Conventionally default standard configuration charger output-current rating in Power Management Unit (PMU).
Power Management Unit middle controller C controls the electric current of transistor base by base current Circuit tuning D, thereby regulates transistor base electric current, makes transistor base electric current be greater than the ratio of standard configuration charger output-current rating and triode multiplication factor.
Fig. 4 is voltage across poles-collector current curve in triode.As shown in Figure 4, when triode is operated in saturation condition (saturation region), compared with being operated in undersaturated condition (amplification region) with triode, collector electrode is less with transmitting voltage across poles, and collector current remains unchanged after stablizing substantially, hence one can see that, and the equivalent resistance of triode is less in the time that triode is operated in saturation condition, and the equivalent resistance of triode is larger in the time that triode is operated in undersaturated condition.
In prior art, by regulating the base current of triode, make transistor base electric current equal the ratio of standard configuration charger output-current rating and triode multiplication factor, thereby enter the constant current charge stage.Now triode is operated in undersaturated condition, is maintained the maximum output current of charger by the charging current of transistor collector.
In embodiments of the present invention, by regulating the base current of triode, make transistor base electric current be greater than the ratio of standard configuration charger output-current rating and triode multiplication factor, thereby enter the constant current charge stage.Due to the current-limiting function of charger, between the base current of triode and collector current, do not meet the multiplication factor of triode, make triode be operated in saturation condition.Be less than the triode equivalent resistance in undersaturated condition in the triode equivalent resistance of saturation condition, due to the current-limiting function of charger, be still maintained the maximum output current of charger by the charging current of transistor collector.
In the constant current charge stage, identical with the charging current by triode in prior art by the charging current of triode in the embodiment of the present invention, but the equivalent resistance of triode is less than the equivalent resistance of triode in prior art in the embodiment of the present invention, so the embodiment of the present invention can reduce the heat that triode work produces.
In addition, in the time that the current-limiting function of charger plays a role, because the charging current by triode is constant, and the equivalent resistance of triode diminishes, the voltage at triode two ends is reduced, the voltage at charger equivalent internal resistance two ends increases, and the output voltage of charger is less than charger rated output voltage.
The another kind of method for charging batteries flow chart that Fig. 6 provides for the embodiment of the present invention.As shown in Figure 6, the method for charging batteries that the embodiment of the present invention provides comprises:
201, obtain battery terminal voltage;
Particularly, in charging circuit, there is an analog to digital converter A2 one end to be connected with the power pins of battery B, to realize the sampling to battery terminal voltage, another section of this analog to digital converter (ADC) is connected with controller C, by sampled result input control device C, to realize the detection of controller C to battery terminal voltage.Controller C detects battery terminal voltage by analog to digital converter (ADC), can obtain the voltage of battery-end.
202, compare battery terminal voltage and constant current charge voltage threshold;
Particularly, constant current charge voltage threshold is known, is that manufacturer determines according to the concrete electrical quantity of charger and electronic equipment, and is conventionally preset in controller C.
In areal, electronic industry is followed identical standard, and the constant current charge voltage threshold of the electronic equipment of same type is identical, and constant current charge voltage threshold also can be determined according to industry standard.
For example, in the time buying mobile phone, the standard configuration charger that mobile phone manufacturer provides for mobile phone, its input voltage: AC 100-240V～50/60HZ, output voltage: DC 5.0V---1000mA, the alternating current voltage scope that represents the reception of this charger for mobile phone be 100V between 240V, the frequency of alternating current is 50HZ or 60HZ; The rated output voltage of this charger for mobile phone is 5V, and maximum output current is 1000mA.The mobile phone that uses the type charger, its constant current charge voltage threshold is 2.8V-3.2V.
203, in the time that battery terminal voltage is more than or equal to constant current charge voltage threshold, regulate transistor base electric current, make the output voltage of charger equal the minimum charge of Power Management Unit.
The minimum charge of Power Management Unit (PMU) is the minimum voltage that ensures that battery can be charged, and is the minimum voltage that charger need to be exported.
When transistor base electric current equals the ratio of standard configuration charger output-current rating and triode multiplication factor, the current-limiting function of charger does not play a role, it is now the separation whether current-limiting function of charger plays a role, in the time that the current-limiting function of charger does not play a role, the output voltage of charger is rated output voltage, and the rated output voltage of charger is greater than the minimum voltage that charger need to be exported.
When transistor base electric current is greater than the ratio of standard configuration charger output-current rating and triode multiplication factor, the current-limiting function of charger starts to play a role, in the time that the current-limiting function of charger plays a role, the output voltage of charger reduces, and is less than charger rated output voltage.
The minimum voltage that charger need to be exported changes along with the change of cell voltage in charging process, and the control of the minimum voltage that need to export charger is adjusted transistor base electric current by controller C and realized.
By the controller C of Power Management Unit (PMU), can change transistor base electric current.Triode is current control device, and due to triode, S is connected in charging circuit, so the charging current of triode S in can control inputs battery.Particularly, triode has the effect that electric current amplifies, and in the amplification region of triode, transistor emitter adds forward voltage, and transistor collector adds after reverse voltage conducting, transistor base Current Control transistor collector electric current.Add that at transistor base a little electric current can cause triode S current collection High-current output, transistor base electric current and transistor collector electric current are similar to linear relationship, between transistor base electric current and transistor collector electric current, have more fixing proportionate relationship, this proportionate relationship is the multiplication factor of triode.In each concrete triode, the multiplication factor of triode is known.
In prior art, linear-charging time m-battery terminal voltage curve as shown in Figure 1, according to the difference of battery terminal voltage state, linear-charging is mainly divided into trickle charge, constant current charge, constant voltage charge three phases.When battery is during in complete discharge condition, battery terminal voltage is extremely low, now needs battery to carry out restorative charging, carries out trickle charge with less charging current; When battery terminal voltage reaches constant current charge voltage threshold when above, improve charging current and carry out constant current charge; When battery terminal voltage reaches constant voltage charge voltage threshold when above, keep the output voltage of charger constant, carry out constant voltage charge.
Particularly, according to the comparative result of step 102, in the time that battery terminal voltage is more than or equal to constant current charge voltage threshold, represent that the trickle charge stage of linear-charging has finished or do not needed to carry out trickle charge, battery need to carry out constant current charge.Certainly, battery is charged and can in time sequencing, not follow trickle charge, constant current charge, constant voltage charge three phases completely, this programme is not only applied in linear-charging process, this programme is for this situation of when charging current constant, no matter current constant while making to charge due to which kind of reason or the design of which kind of charging modes.The linear-charging technical scheme of introducing in background technology can not be interpreted as the restriction to this programme.
Standard configuration charger output-current rating is known.For example, in the time buying mobile phone, the standard configuration charger that mobile phone manufacturer provides for mobile phone, its input voltage: AC 100-240V～50/60HZ, output voltage: DC5.0V---1000mA, the alternating current voltage scope that represents the reception of this charger for mobile phone be 100V between 240V, the frequency of alternating current is 50HZ or 60HZ; The rated output voltage of this charger for mobile phone is 5V, and maximum output current is 1000mA.Use this standard configuration charger charging, standard configuration charger output-current rating is 1000mA.Conventionally default standard configuration charger output-current rating in Power Management Unit (PMU).
Power Management Unit middle controller C controls the electric current of transistor base by base current Circuit tuning D, thereby regulates transistor base electric current, makes the output voltage of charger equal the minimum charge of Power Management Unit.
Fig. 4 is voltage across poles-collector current curve in triode.As shown in Figure 4, when triode is operated in saturation condition (saturation region), compared with being operated in undersaturated condition (amplification region) with triode, collector electrode is less with transmitting voltage across poles, and collector current remains unchanged after stablizing substantially, hence one can see that, and the equivalent resistance of triode is less in the time that triode is operated in saturation condition, and the equivalent resistance of triode is larger in the time that triode is operated in undersaturated condition.
In prior art, by regulating the base current of triode, make transistor base electric current equal the ratio of standard configuration charger output-current rating and triode multiplication factor, thereby enter the constant current charge stage.Now triode is operated in undersaturated condition, is maintained the maximum output current of charger by the charging current of transistor collector.
In embodiments of the present invention, by regulating the base current of triode, make the output voltage of charger equal the minimum charge of Power Management Unit, thereby enter the constant current charge stage.Due to the current-limiting function of charger, between the base current of triode and collector current, do not meet the multiplication factor of triode, make triode be operated in saturation condition.Be less than the triode equivalent resistance in undersaturated condition in the triode equivalent resistance of saturation condition, due to the current-limiting function of charger, still be maintained the maximum output current of charger by the charging current of transistor collector, and because Power Management Unit (PMU) is in minimum charge state, can meet under the prerequisite of charged state, make triode equivalent resistance in minimum value.
In the constant current charge stage, identical with the charging current by triode in prior art by the charging current of triode in the embodiment of the present invention, but the equivalent resistance of triode is less than the equivalent resistance of triode in prior art in the embodiment of the present invention, so the embodiment of the present invention can reduce the heat that triode work produces.
In addition, in the time that the current-limiting function of charger plays a role, because the charging current by triode is constant, and the equivalent resistance of triode diminishes, the voltage at triode two ends is reduced, the voltage at charger equivalent internal resistance two ends increases, and the output voltage of charger is less than charger rated output voltage.
Although electronic equipment, in the time selling, generally can provide standard configuration charger to user, battery is charged safely and efficiently ensureing, the charger that user selects in actual charging process is not often standard configuration charger.
The charger that can charge to same type electronic equipment, its rated output voltage is identical.According to the magnitude relationship of the restriction charging current of charger maximum output current and electronic equipment, charger can be divided into high-power charger, standard configuration charger and low power charger.
High-power charger maximum output current is greater than the restriction charging current of electronic equipment, in the time adopting the method shown in Fig. 5 to charge, can make the restriction charging current disabler of electronic equipment, cause charging current to be greater than the restriction charging current of electronic equipment, the charging of electronic equipment is threatened safely.
Standard configuration charger output-current rating equals the restriction charging current of electronic equipment, low power charger maximum output current is less than the restriction charging current of electronic equipment, in the time adopting the method shown in Fig. 5 to charge, due to the current-limiting function of charger, the charging current that charger provides to electronic equipment can not exceed the restriction charging current of electronic equipment, can not threaten safely to the charging of electronic equipment.
In order to realize the identification to charger type, the another kind of method for charging batteries flow chart that Fig. 7 provides for the embodiment of the present invention.As shown in Figure 7, the method for charging batteries that the embodiment of the present invention provides comprises:
301, obtain battery terminal voltage;
Particularly, in charging circuit, there is an analog to digital converter A2 one end to be connected with the power pins of battery B, to realize the sampling to battery terminal voltage, another section of this analog to digital converter (ADC) is connected with controller C, by sampled result input control device C, to realize the detection of controller C to battery terminal voltage.Controller C detects battery terminal voltage by analog to digital converter (ADC), can obtain the voltage of battery-end.
302, compare battery terminal voltage and constant current charge voltage threshold;
Particularly, constant current charge voltage threshold is known, is that manufacturer determines according to the concrete electrical quantity of charger and electronic equipment, and is conventionally preset in controller C.
In areal, electronic industry is followed identical standard, and the constant current charge voltage threshold of the electronic equipment of same type is identical, and constant current charge voltage threshold also can be determined according to industry standard.
For example, in the time buying mobile phone, the standard configuration charger that mobile phone manufacturer provides for mobile phone, its input voltage: AC 100-240V～50/60HZ, output voltage: DC 5.0V---1000mA, the alternating current voltage scope that represents the reception of this charger for mobile phone be 100V between 240V, the frequency of alternating current is 50HZ or 60HZ; The rated output voltage of this charger for mobile phone is 5V, and maximum output current is 1000mA.The mobile phone that uses the type charger, its constant current charge voltage threshold is 2.8V-3.2V.
303,, in the time that battery terminal voltage is more than or equal to constant current charge voltage threshold, increase transistor base electric current;
By the controller C of Power Management Unit (PMU), can change transistor base electric current.Triode is current control device, because triode is connected in charging circuit, and the charging current of all triodes in can control inputs battery.Particularly, triode has the effect that electric current amplifies, and in the amplification region of triode, transistor emitter adds forward voltage, and transistor collector adds after reverse voltage conducting, transistor base Current Control transistor collector electric current.Add that at transistor base a little electric current can cause triode S current collection High-current output, transistor base electric current and transistor collector electric current are similar to linear relationship, between transistor base electric current and transistor collector electric current, have more fixing proportionate relationship, this proportionate relationship is the multiplication factor of triode.In each concrete triode, the multiplication factor of triode is known.
In prior art, linear-charging time m-battery terminal voltage curve as shown in Figure 1, according to the difference of battery terminal voltage state, linear-charging is mainly divided into trickle charge, constant current charge, constant voltage charge three phases.When battery is during in complete discharge condition, battery terminal voltage is extremely low, now needs battery to carry out restorative charging, carries out trickle charge with less charging current; When battery terminal voltage reaches constant current charge voltage threshold when above, improve charging current and carry out constant current charge; When battery terminal voltage reaches constant voltage charge voltage threshold when above, keep the output voltage of charger constant, carry out constant voltage charge.
Particularly, according to the comparative result of step 202, in the time that battery terminal voltage is more than or equal to constant current charge voltage threshold, represent that the trickle charge stage of linear-charging has finished or do not needed to carry out trickle charge, battery need to carry out constant current charge.Certainly, battery is charged and can in time sequencing, not follow trickle charge, constant current charge, constant voltage charge three phases completely, this programme is not only applied in linear-charging process, this programme is for this situation of when charging current constant, no matter current constant while making to charge due to which kind of reason or the design of which kind of charging modes.The linear-charging technical scheme of introducing in background technology can not be interpreted as the restriction to this programme.
By the controller C of Power Management Unit (PMU), can change transistor base electric current.Triode is current control device, because triode is connected in charging circuit, and the charging current of all triodes in can control inputs battery.Particularly, triode has the effect that electric current amplifies, and in the amplification region of triode, transistor emitter adds forward voltage, and transistor collector adds after reverse voltage conducting, transistor base Current Control transistor collector electric current.Add that at transistor base a little electric current can cause triode S current collection High-current output, transistor base electric current and transistor collector electric current are similar to linear relationship, between transistor base electric current and transistor collector electric current, have more fixing proportionate relationship, this proportionate relationship is the multiplication factor of triode.In each concrete triode, the multiplication factor of triode is known.
304, compare output voltage and the charger rated output voltage of charger;
Particularly, in Power Management Unit, an analog to digital converter (ADC) one end is connected with the power pins of charger E, realizes the sampling to charger output voltage; The other end is connected with controller C, by sampled result input control device C, to realize the detection of controller C to charger output voltage.Controller C detects the output voltage of charger by analog to digital converter (ADC), can obtain the output voltage of charger.
For example, in the time buying mobile phone, the standard configuration charger that mobile phone manufacturer provides for mobile phone, its input voltage: AC 100-240V～50/60HZ, output voltage: DC 5.0V---1000mA, the alternating current voltage scope that represents the reception of this charger for mobile phone be 100V between 240V, the frequency of alternating current is 50HZ or 60HZ; The rated output voltage of this charger for mobile phone is 5V, and maximum output current is 1000mA.
In addition, in trickle charge process, the output voltage of charger remains unchanged, and this voltage is the rated output voltage of charger.In the trickle charge stage, controller C can obtain the rated output voltage of charger by analog to digital converter (ADC).
305, in the time that the output voltage of charger is less than charger rated output voltage, regulate transistor base electric current, make transistor base electric current be greater than the ratio of standard configuration charger output-current rating and triode multiplication factor, or, regulate transistor base electric current, make the output voltage of charger equal the minimum charge of Power Management Unit.
Particularly, transistor collector is connected with the power pins of charger E, and transistor emitter is connected with the power pins of battery B, and triode S is connected in charging circuit by the mode of series connection; Power Management Unit (PMU), by base current adjustment unit control transistor base electric current, is passed through transistor collector electric current thereby control, and then controls the charging current in charging circuit.Because charging current is controlled by Power Management Unit (PMU), so charging current is known for Power Management Unit (PMU).
Standard configuration charger output-current rating is known.For example, in the time buying mobile phone, the standard configuration charger that mobile phone manufacturer provides for mobile phone, its input voltage: AC 100-240V～50/60HZ, output voltage: DC5.0V---1000mA, the alternating current voltage scope that represents the reception of this charger for mobile phone be 100V between 240V, the frequency of alternating current is 50HZ or 60HZ; The rated output voltage of this charger for mobile phone is 5V, and maximum output current is 1000 mA.Use this standard configuration charger charging, standard configuration charger output-current rating is 1000mA.Conventionally default standard configuration charger output-current rating in Power Management Unit (PMU).
Power Management Unit middle controller C controls the electric current of transistor base, by the controller C in Power Management Unit, can regulate transistor base electric current, makes transistor base electric current be greater than the ratio of standard configuration charger output-current rating and triode multiplication factor.
Method shown in Fig. 5 is applied in the constant current charge stage, so before entering the constant current charge stage,, in the time that battery terminal voltage is more than or equal to constant current charge voltage threshold, need to judge the type of charger.
Increase transistor base electric current, thereby the electric current of setting by transistor collector is increased, reality is charging current by the electric current of transistor collector.When triode is operated in amplification region, set and be actual charging current by the electric current of transistor collector; When triode is operated in saturation region, set by the electric current of transistor collector not identical with actual charging current.
For low power charger, do not reach the restriction charging current of electronic equipment in charging current before, it is maximum that its maximum output current has reached, and due to the current-limiting function of charger, makes the output voltage of charger be less than charger rated output voltage.
For standard configuration charger, in the time that charging current reaches the restriction charging current of electronic equipment, it is maximum that its maximum output current has reached, and continuation increase transistor base electric current can trigger the current-limiting function of charger, makes the output voltage of charger be less than charger rated output voltage.
For high-power charger, in the time that charging current reaches the restriction charging current of electronic equipment, it is maximum that its maximum output current does not reach, and continuation increase transistor base electric current can not trigger the current-limiting function of charger, and now the output voltage of high-power charger equals its rated output voltage.Triode S allows the current maxima of passing through to be less than high-power charger maximum output current, makes charging current can not continue to increase.
Increasing after transistor base electric current, relatively output voltage and the charger rated output voltage of charger, in the time that the output voltage of charger is less than charger rated output voltage, represent that the charger using, for low power charger or standard configuration charger, can use the method shown in Fig. 5 or Fig. 6.
Certainly, in actual use, due to the reason such as reason and wire dividing potential drop of electric device self, the voltage recording, current value conventionally and the rated value identifying on charger, electronic equipment incomplete same.This species diversity is well known to a person skilled in the art, can be because of the rated value identifying on charger, the electronic equipment different understanding that cause the technical program different from actual measured value.
A kind of battery charger structure chart that Fig. 8 provides for the embodiment of the present invention.As shown in Figure 8, a kind of battery charger that the embodiment of the present invention provides comprises:
Detecting unit 401, for obtaining battery terminal voltage;
Comparing unit 402, for comparing battery terminal voltage and constant current charge voltage threshold;
Regulon 403, when being more than or equal to constant current charge voltage threshold when battery terminal voltage, regulates transistor base electric current, makes transistor base electric current be greater than the ratio of standard configuration charger output-current rating and triode multiplication factor.
The battery charger providing embodiment illustrated in fig. 8 is for realizing method embodiment illustrated in fig. 5, and the technique effect that can realize, with middle method embodiment illustrated in fig. 5, is not repeated herein.
In addition, regulon 403, also for regulating transistor base electric current, makes the output voltage of charger equal the minimum charge of Power Management Unit.
The battery charger providing embodiment illustrated in fig. 8 is for realizing method embodiment illustrated in fig. 6, and the technique effect that can realize, with middle method embodiment illustrated in fig. 6, is not repeated herein.
In addition, detecting unit 401, also for obtaining the output voltage of charger;
Comparing unit 402, also for comparing output voltage and the charger rated output voltage of charger;
Regulon 403, also when being more than or equal to constant current charge voltage threshold when battery terminal voltage, increase transistor base electric current, also in the time that the output voltage of charger is less than charger rated output voltage, regulate transistor base electric current, make transistor base electric current be greater than the ratio of standard configuration charger output-current rating and triode multiplication factor.
The battery charger providing embodiment illustrated in fig. 8 is for realizing method embodiment illustrated in fig. 7, and the technique effect that can realize, with middle method embodiment illustrated in fig. 7, is not repeated herein.
The present invention is with reference to describing according to flow chart and/or the block diagram of the method for the embodiment of the present invention, equipment (system) and computer program.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or the combination of square frame.The processor of these computer program instructions to all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device can be provided, make the function of specifying in a flow process in can realization flow figure of instruction that the processor by this computer or other programmable data processing device carries out or multiple flow process and/or square frame of block diagram or multiple square frame.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, the instruction that makes to be stored in this computer-readable memory produces the manufacture that comprises command device, and this command device is realized the function of specifying in flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make to carry out sequence of operations step to produce computer implemented processing on computer or other programmable devices, thereby the instruction of carrying out is provided for realizing the step of the function of specifying in flow process of flow chart or a square frame of multiple flow process and/or block diagram or multiple square frame on computer or other programmable devices.
Although described the preferred embodiments of the present invention, once those skilled in the art obtain the basic creative concept of cicada, can make other change and amendment to these embodiment.So claims are intended to be interpreted as comprising preferred embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if these amendments of the present invention and within modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (6)
1. a method for charging batteries, is characterized in that, comprising:
Obtain battery terminal voltage;
More described battery terminal voltage and constant current charge voltage threshold;
In the time that described battery terminal voltage is more than or equal to described constant current charge voltage threshold, regulate transistor base electric current, make transistor base electric current be greater than the ratio of standard configuration charger output-current rating and triode multiplication factor.
2. method for charging batteries as claimed in claim 1, is characterized in that described adjusting transistor base electric current, makes transistor base electric current be greater than standard configuration charger output-current rating and specifically comprises the steps: with the ratio of triode multiplication factor
Regulate described transistor base electric current, make the output voltage of charger equal the minimum charge of Power Management Unit.
3. method for charging batteries as claimed in claim 1 or 2, is characterized in that, described in the time that described battery terminal voltage is more than or equal to described constant current charge voltage threshold after, before described adjusting transistor base electric current, also comprise:
Increase transistor base electric current;
The output voltage of more described charger and described charger rated output voltage;
In the time that the output voltage of charger is less than described charger rated output voltage, regulate described transistor base electric current.
4. a battery charger, is characterized in that, comprising:
Detecting unit, for obtaining battery terminal voltage;
Comparing unit, for more described battery terminal voltage and constant current charge voltage threshold;
Regulon, in the time that described battery terminal voltage is more than or equal to described constant current charge voltage threshold, regulates transistor base electric current, makes transistor base electric current be greater than the ratio of standard configuration charger output-current rating and triode multiplication factor.
5. battery charger as claimed in claim 4, is characterized in that
Described regulon, also, for regulating described transistor base electric current, makes the output voltage of charger equal the minimum charge of Power Management Unit.
6. the battery charger as described in claim 4 or 5, is characterized in that,
Described detecting unit, also for obtaining the output voltage of described charger;
Described comparing unit, also for output voltage and the described charger rated output voltage of more described charger;
Described regulon, also in the time that described battery terminal voltage is more than or equal to described constant current charge voltage threshold, increase transistor base electric current, also in the time that the output voltage of charger is less than described charger rated output voltage, regulate transistor base electric current, make transistor base electric current be greater than the ratio of standard configuration charger output-current rating and triode multiplication factor.
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|---|---|---|---|
| CN201410440768.0A CN104158267A (en) | 2014-09-01 | 2014-09-01 | Charging method and device for battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410440768.0A CN104158267A (en) | 2014-09-01 | 2014-09-01 | Charging method and device for battery |
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| CN104158267A true CN104158267A (en) | 2014-11-19 |
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| CN108023130A (en) * | 2017-12-13 | 2018-05-11 | 中国科学技术大学 | A kind of lithium ion battery charging optimization method |
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Application publication date: 20141119 |