CN103094939A - Battery management circuit - Google Patents
Battery management circuit Download PDFInfo
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- CN103094939A CN103094939A CN201110340302XA CN201110340302A CN103094939A CN 103094939 A CN103094939 A CN 103094939A CN 201110340302X A CN201110340302X A CN 201110340302XA CN 201110340302 A CN201110340302 A CN 201110340302A CN 103094939 A CN103094939 A CN 103094939A
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Abstract
The utility model provides a battery management circuit used for providing plural number working voltage. The battery management circuit comprises a first battery module, a second battery module, a boost converter and a buck converter. The first battery module provides a first battery voltage, and the second battery module provides a second battery voltage, wherein the first battery voltage is bigger than the second battery voltage. The boost converter conducts transition on the first battery voltage to generate a first working voltage of the first battery voltage. The buck converter conducts transition on the second battery voltage to generate a second working voltage of the second battery voltage. The battery management circuit has the advantages of promoting use efficiency of the battery and prolonging service time of a portable electric device.
Description
Technical field
The present invention relates to a kind of battery management circuit, and be particularly related to a kind of battery management circuit of portable electron device.
Background technology
Along with scientific and technological progress, function and the performance of portable electron device are constantly promoted, so that increased the consumption of electric power.The development trend of portable electron device designs towards compact, and take mobile device as example, mobile device comprises display, hardware circuit plate, battery, antenna etc.In order to extend the service time of portable electron device, can select more energy-conservation spare part on hardware, use jumbo battery or improve the conversion efficiency of power supply and the service efficiency of battery.
Therefore, a kind of battery management circuit of needs promotes the service efficiency of battery, to extend the service time of portable electron device.
Summary of the invention
The invention provides a kind of battery management circuit, be used to provide plural operating voltage.Above-mentioned battery management circuit comprises: one first battery module is used to provide one first cell voltage; One second battery module is used to provide one second cell voltage, and wherein above-mentioned the first cell voltage is greater than above-mentioned the second cell voltage; One boost converter is coupled to above-mentioned the first battery module, is used for above-mentioned the first cell voltage is changed, to produce one first operating voltage greater than above-mentioned the first cell voltage; And a step-down controller, be coupled to above-mentioned the second battery module, be used for above-mentioned the second cell voltage is changed, to produce one second operating voltage less than above-mentioned the second cell voltage.
Description of drawings
Fig. 1 is the system block diagram according to the described portable electron device of first embodiment of the invention.
Fig. 2 is the system block diagram according to the described portable electron device of second embodiment of the invention.
Fig. 3 is the system block diagram according to the described portable electron device of third embodiment of the invention.
Wherein:
10A, 10B, 10C-portable electron device; The 110-controller;
120,130-battery module; 122,124,132,134-battery;
The 140-boost converter; The 150-step-down controller;
160,170-charging module; 20A, 20B, 20C-battery management circuit;
The 30-backlight module; The 40-display unit;
The 50-central processing unit; The 60-memory modules;
The 70-input/output module;
Ctrl1, Ctrl2, Ctrl3, Info1, Info2-control signal;
The PWR-power supply; SW1, SW2, SW3-switch;
VBAT1, VBAT2-voltage;
VH1, VH2, VL1, VL2, VL3～operating voltage.
Embodiment
For purpose of the present invention, feature and advantage can be become apparent, cited below particularlyly go out preferred embodiment, and coordinate accompanying drawing, be described in detail below:
Portable electron device with battery as power supply.The kind of battery is a lot, such as alkaline battery, nickel-cadmium cell, Ni-MH battery and lithium battery etc., and wherein the battery of other kind of energy Ratios of the Unit Weight of lithium battery or unit volume is high.In addition, lithium battery has also that discharge voltage is stable, operating temperature range is wider, self-discharge rate is low, storage life is long and the advantage such as memory-less effect.Therefore, lithium battery is widely used in various portable electron devices, such as mobile phone, notebook computer, flat computer etc.According to the demand of different electronic products, lithium battery can be made flat, rectangular or cylindrical etc., and can be by the synthetic battery module of a plurality of battery pack.Generally speaking, the rated voltage of lithium battery is 3.6V to 3.7V, and the voltage of lithium battery when being full of electricity is about 4.1V to 4.2V, and it is relevant from different anode materials.
In portable electron device, because each integrated circuit and module may have different operating voltages, therefore need different types of electric pressure converter complete the power supply supply.The operating voltage of integrated circuit mostly is greatly 3.3V, 1.8V or 1.2V, and it is lower than the rated voltage of general lithium battery.Therefore, can obtain with step-down controller the operating voltage of integrated circuit.In general, the operating voltage of electric pressure converter is more near input voltage, and conversion efficiency is higher.On the other hand, the liquid crystal display of portable electron device (LCD) is used the backlight module with light-emitting diode (LED), and wherein the size of liquid crystal display is relevant to the number of light-emitting diode.For instance, the backlight module of 10 inches liquid crystal display needs plural groups diode string in parallel, and wherein each group diode string comprises the light-emitting diode of 7 series connection.Usually need the forward bias voltage drop of 3V due to each light-emitting diode, so need the power supply of 21V can drive the light-emitting diode of 7 series connection.Therefore, need to provide the backlight module of power supply to liquid crystal display with boost converter.In addition, if large-sized display unit needs higher operating voltage, also can be provided by boost converter.No matter be step-down controller or boost converter, during more near operating voltage, conversion efficiency is higher when input voltage.
Fig. 1 is the system block diagram 10A according to the described portable electron device of first embodiment of the invention.Portable electron device 10A comprises battery management circuit 20A, backlight module 30, display unit 40, central processing unit 50, memory modules 60 and input/output module 70.In portable electron device 10A, battery management circuit 20A can provide higher operating voltage VH1 and VH2 to backlight module 30 and display unit 40, and provides simultaneously lower operating voltage VL1, VL2 and VL3 to central processing unit 50, memory modules 60 and input/output module 70.Battery management circuit 20A comprises battery module 120, battery module 130, boost converter 140 and step-down controller 150.Battery module 120 comprises two batteries 122 and 124 that connect with series system, and battery module 130 comprises two batteries 132 and 134 that connect with parallel way, and wherein battery 122,124,132 and 134 has identical rated voltage.Therefore, the voltage VBAT1 that provides of the battery module 120 voltage VBAT2 that can provide greater than battery module 130.In one embodiment, battery module 120 comprises the plural battery unit that connects with parallel way, and wherein each battery unit comprises two batteries 122 and 124 that connect with series system.Boost converter 140 is used for the voltage VBAT1 that battery module 120 provides is changed, and to produce operating voltage VH1 and VH2, wherein operating voltage VH1 and VH2 are greater than voltage VBAT1.And step-down controller 150 is used for the voltage VBAT2 that battery module 130 provides is changed, and to produce operating voltage VL1, VL2 and VL3, wherein operating voltage VL1, VL2 and VL3 are less than voltage VBAT1.For boost converter 140 and step-down controller 150, because therefore input voltage can improve conversion efficiency near operating voltage, thereby increase the service time of portable electron device 10A.
Fig. 2 is the system block diagram 10B according to the described portable electron device of second embodiment of the invention.Portable electron device 10B comprises battery management circuit 20B, backlight module 30, display unit 40, central processing unit 50, memory modules 60 and input/output module 70.In portable electron device 10B, battery management circuit 20B can provide higher operating voltage VH1 and VH2 to backlight module 30 and display unit 40, and provides simultaneously lower operating voltage VL1, VL2 and VL3 to central processing unit 50, memory modules 60 and input/output module 70.Battery management circuit 20B comprises controller 110, battery module 120, battery module 130, boost converter 140, step-down controller 150 and three switch SW 1-SW3.Battery module 120 comprises two batteries 122 and 124 that connect with series system, and battery module 130 comprises two batteries 132 and 134 that connect with parallel way, and wherein battery 122,124,132 and 134 has identical rated voltage.Therefore, the voltage VBAT1 that provides of the battery module 120 voltage VBAT2 that can provide greater than battery module 130.In one embodiment, battery module 120 comprises the plural battery unit that connects with parallel way, and wherein each battery unit comprises two batteries 122 and 124 that connect with series system.Boost converter 140 is used for the voltage VBAT1 that battery module 120 provides is changed, and to produce operating voltage VH1 and VH2, wherein operating voltage VH1 and VH2 are greater than voltage VBAT1.And step-down controller 150 is used for the voltage VBAT2 that battery module 130 provides is changed, and to produce operating voltage VL1, VL2 and VL3, wherein operating voltage VL1, VL2 and VL3 are less than voltage VBAT1.For boost converter 140 and step-down controller 150, because therefore input voltage can improve conversion efficiency near operating voltage, thereby increase the service time of portable electron device 10B.
In battery management circuit 20B, according to the voltage VBAT1 of battery module 120 and the voltage VBAT2 of battery module 130, controller 110 can provide control signal Ctrl1, Ctrl2 and Ctrl3 to come the switching of control switch SW1, SW2 and SW3.When controller 110 detects the electric weight of battery module 120 and battery module 130 when normal, be voltage VBAT1 more than or equal to critical voltage Vth1 and voltage VBAT2 more than or equal to critical voltage Vth2, controller 110 can control switch SW3 be conducting for not conducting switch SW 1 with SW2.So boost converter 140 can produce operating voltage VH1 and VH2 according to the voltage VBAT1 of battery module 120, and step-down controller 150 can produce operating voltage VL1, VL2 and VL3 according to the voltage VBAT2 of battery module 130.When controller 110 detected the electric weight of in two battery modules and uses up, controller 110 can be controlled corresponding switches be not conducting, and changing by another battery module provides electric power.For instance, when the electric weight of battery module 120 was used up (voltage VBAT1 is less than critical voltage Vth1), controller 110 can control switch SW1 be conducting for not conducting switch SW 2 with SW3.So battery module 130 can provide voltage VBAT2 to boost converter 140 and step-down controller 150 simultaneously.When controller 110 control switch SW1, SW2 and SW3, controller 110 also can provide control signal Info1 to boost converter 140, so that the voltage VBAT2 that controlling 140 pairs of battery modules 130 of boost converter provides changes, to produce operating voltage VH1 and VH2 to backlight module 30 and display unit 40.Otherwise when the electric weight of battery module 130 was used up (voltage VBAT2 is less than critical voltage Vth2), controller 110 can control switch SW2 be conducting for not conducting switch SW 1 with SW3.So battery module 120 can provide voltage VBAT1 to boost converter 140 and step-down controller 150 simultaneously.Similarly, when controller 110 control switch SW1, SW2 and SW3, controller 110 also can provide control signal Info2 to step-down controller 150, so that the voltage VBAT1 that 150 pairs of battery modules 120 of controlled hypotension transducer provide changes, to produce operating voltage VL1, VL2 and VL3 to central processing unit 50, memory modules 60 and input/output module 70.
Fig. 3 is the system block diagram 10C according to the described portable electron device of third embodiment of the invention.Portable electron device 10C comprises battery management circuit 20C, backlight module 30, display unit 40, central processing unit 50, memory modules 60 and input/output module 70.In portable electron device 10C, battery management circuit 20C can provide higher operating voltage VH1 and VH2 to backlight module 30 and display unit 40, and provides simultaneously lower operating voltage VL1, VL2 and VL3 to central processing unit 50, memory modules 60 and input/output module 70.Battery management circuit 20C comprises controller 110, battery module 120, battery module 130, boost converter 140, step-down controller 150, three switch SW 1-SW3 and charging module 160 and 170.Controller 110 can provide control signal Ctrl1, Ctrl2 and Ctrl3 to come control switch SW1, SW2 and SW3 respectively, and wherein switch SW 1 is coupled between battery module 120 and boost converter 140, switch SW 2 is coupled between battery module 130 and step-down controller 150 and switch SW 3 is coupled between boost converter 140 and step-down controller 150.Battery module 120 comprises two batteries 122 and 124 that connect with series system, and battery module 130 comprises two batteries 132 and 134 that connect with parallel way, and wherein battery 122,124,132 and 134 has identical rated voltage.Therefore, the voltage VBAT1 that provides of the battery module 120 voltage VBAT2 that can provide greater than battery module 130.In one embodiment, battery module 120 comprises the plural battery unit that connects with parallel way, and wherein each battery unit comprises two batteries 122 and 124 that connect with series system.Boost converter 140 is used for the voltage VBAT1 that battery module 120 provides is changed, and to produce operating voltage VH1 and VH2, wherein operating voltage VH1 and VH2 are greater than voltage VBAT1.And step-down controller 150 is used for the voltage VBAT2 that battery module 130 provides is changed, and to produce operating voltage VL1, VL2 and VL3, wherein operating voltage VL1, VL2 and VL3 are less than voltage VBAT1.For boost converter 140 and step-down controller 150, because therefore input voltage can improve conversion efficiency near operating voltage, thereby increase the service time of portable electron device 10C.
In battery management circuit 20C, according to the voltage VBAT1 of battery module 120 and the voltage VBAT2 of battery module 130, controller 110 can provide control signal Ctrl1, Ctrl2 and Ctrl3 to come the switching of control switch SW1, SW2 and SW3.When controller 110 detects the electric weight of battery module 120 and battery module 130 when normal, be voltage VBAT1 more than or equal to critical voltage Vth1 and voltage VBAT2 more than or equal to critical voltage Vth2, controller 110 can control switch SW3 be conducting for not conducting switch SW 1 with SW2.So boost converter 140 can produce operating voltage VH1 and VH2 according to the voltage VBAT1 of battery module 120, and step-down controller 150 can produce operating voltage VL1, VL2 and VL3 according to the voltage VBAT2 of battery module 130.When controller 110 detected the electric weight of in two battery modules and uses up, controller 110 can be controlled corresponding switches be not conducting, and changing by another battery module provides electric power.For instance, when the electric weight of battery module 120 was used up (voltage VBAT1 is less than critical voltage Vth1), controller 110 can control switch SW1 be conducting for not conducting switch SW 2 with SW3.So battery module 130 can provide voltage VBAT2 to boost converter 140 and step-down controller 150 simultaneously.When controller 110 control switch SW1, SW2 and SW3, controller 110 also can provide control signal Info1 to boost converter 140, so that the voltage VBAT2 that controlling 140 pairs of battery modules 130 of boost converter provides changes, to produce operating voltage VH1 and VH2 to backlight module 30 and display unit 40.Otherwise when the electric weight of battery module 130 was used up (voltage VBAT2 is less than critical voltage Vth2), controller 110 can control switch SW2 be conducting for not conducting switch SW 1 with SW3.So battery module 120 can provide voltage VBAT1 to boost converter 140 and step-down controller 150 simultaneously.Similarly, when controller 110 control switch SW1, SW2 and SW3, controller 110 also can provide control signal Info2 to step-down controller 150, so that the voltage VBAT1 that 150 pairs of battery modules 120 of controlled hypotension transducer provide changes, to produce operating voltage VL1, VL2 and VL3 to central processing unit 50, memory modules 60 and input/output module 70.
In addition, when a charger or transformer charged to portable electron device 10C, controller 110 can judge whether battery module 120 and battery module 130 are charged according to the voltage VBAT1 of battery module 120 and the voltage VBAT2 of battery module 130.For instance, as the voltage VBAT1 of battery module 120 during less than saturation voltage Vsat1, controller 110 can be controlled charging modules 160 and according to the power supply PWR that charger or transformer provide, battery module 120 be charged.On the other hand, during less than saturation voltage Vsat2, controller 110 can be controlled charging modules 170 and according to power supply PWR, battery module 130 be charged as the voltage VBAT2 of battery module 130.Particularly, therefore the voltage that provides due to battery module 120 and battery module 130 need to use charging module 160 and 170 respectively battery module 120 and battery module 130 interior batteries to be charged for different.
Although the present invention discloses as above with preferred embodiment; so it is not to limit the present invention, has in any affiliated technical field and usually knows the knowledgeable, without departing from the spirit and scope of the present invention; when can do a little change and retouching, so protection scope of the present invention is as the criterion with claims.
Claims (9)
1. a battery management circuit, be used to provide plural operating voltage, comprising:
One first battery module is used to provide one first cell voltage;
One second battery module is used to provide one second cell voltage, and wherein above-mentioned the first cell voltage is greater than above-mentioned the second cell voltage;
One boost converter is coupled to above-mentioned the first battery module, is used for above-mentioned the first cell voltage is changed, to produce one first operating voltage greater than above-mentioned the first cell voltage; And
One step-down controller is coupled to above-mentioned the second battery module, is used for above-mentioned the second cell voltage is changed, to produce one second operating voltage less than above-mentioned the second cell voltage.
2. battery management circuit as claimed in claim 1, it is characterized in that, above-mentioned the first battery module comprises at least two first batteries that connect with series system, and above-mentioned the second battery module comprises that wherein above-mentioned the first battery has identical rated voltage with above-mentioned the second battery with at least two second batteries of parallel way connection.
3. battery management circuit as claimed in claim 1, it is characterized in that, above-mentioned the first battery module comprises the plural battery unit that connects with parallel way, wherein each above-mentioned battery unit comprises plural number the first battery that connects with series system, and above-mentioned the second battery module comprises that wherein above-mentioned the first battery has identical rated voltage with above-mentioned the second battery with plural number second battery of parallel way connection.
4. battery management circuit as claimed in claim 1, is characterized in that, also comprises:
One first switch is coupled between above-mentioned the first battery module and above-mentioned boost converter;
One second switch is coupled between above-mentioned the second battery module and above-mentioned step-down controller;
One the 3rd switch is coupled between above-mentioned boost converter and above-mentioned step-down controller; And
One controller is used for controlling above-mentioned first, second and third switch according to above-mentioned the first cell voltage and above-mentioned the second cell voltage.
5. battery management circuit as claimed in claim 4, it is characterized in that, more than or equal to one first critical voltage and above-mentioned the second cell voltage during more than or equal to second critical voltage, it is conducting for above-mentioned first and second switch of not conducting that above-mentioned controller is controlled above-mentioned the 3rd switch when above-mentioned the first cell voltage.
6. battery management circuit as claimed in claim 5, it is characterized in that, when above-mentioned the first cell voltage during less than above-mentioned the first critical voltage, it is conducting for above-mentioned second and third switch of not conducting that above-mentioned controller is controlled above-mentioned the first switch, and above-mentioned boost converter changes above-mentioned the second cell voltage, to produce above-mentioned the first operating voltage.
7. battery management circuit as claimed in claim 5, it is characterized in that, when above-mentioned the second cell voltage during less than above-mentioned the second critical voltage, it is conducting for not conducting above-mentioned first and the 3rd switch that above-mentioned controller is controlled above-mentioned second switch, and above-mentioned step-down controller changes above-mentioned the second cell voltage, to produce above-mentioned the second operating voltage.
8. battery management circuit as claimed in claim 1, is characterized in that, also comprises:
One first charging module is coupled to above-mentioned the first battery module;
One second charging module is coupled to above-mentioned the second battery module; And
One controller;
Wherein when above-mentioned the first cell voltage during less than first saturation voltage, above-mentioned controller is controlled above-mentioned the first charging module and according to a power supply, above-mentioned the first battery module is charged, and when above-mentioned the second cell voltage during less than second saturation voltage, above-mentioned controller is controlled above-mentioned the second charging module and according to above-mentioned power supply, above-mentioned the second battery module is charged.
9. battery management circuit as claimed in claim 1, is characterized in that, above-mentioned battery management circuit is arranged in a portable electron device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110340302XA CN103094939A (en) | 2011-11-01 | 2011-11-01 | Battery management circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110340302XA CN103094939A (en) | 2011-11-01 | 2011-11-01 | Battery management circuit |
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| CN103094939A true CN103094939A (en) | 2013-05-08 |
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| CN201110340302XA Pending CN103094939A (en) | 2011-11-01 | 2011-11-01 | Battery management circuit |
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Cited By (4)
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| TWI625912B (en) * | 2016-10-12 | 2018-06-01 | 廣東歐珀移動通信有限公司 | Mobile terminal |
| TWI627815B (en) * | 2016-10-12 | 2018-06-21 | 廣東歐珀移動通信有限公司 | Mobile terminal |
| US11056896B2 (en) | 2016-10-12 | 2021-07-06 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Terminal and device |
| US11171499B2 (en) | 2017-04-13 | 2021-11-09 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Device to be charged with multiple charging channels, charging method, and charging control circuit with multiple charging channels |
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| EP1728533A1 (en) * | 2005-05-31 | 2006-12-06 | Marvell World Trade Ltd. | Medical device |
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| CN1667910A (en) * | 2004-03-08 | 2005-09-14 | 日本电气株式会社 | Battery switching circuit for a portable communication device, battery switching method therefor, and battery switching program therefor |
| EP1728533A1 (en) * | 2005-05-31 | 2006-12-06 | Marvell World Trade Ltd. | Medical device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI625912B (en) * | 2016-10-12 | 2018-06-01 | 廣東歐珀移動通信有限公司 | Mobile terminal |
| TWI627815B (en) * | 2016-10-12 | 2018-06-21 | 廣東歐珀移動通信有限公司 | Mobile terminal |
| US10536006B2 (en) | 2016-10-12 | 2020-01-14 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Device to be charged and charging method |
| US10727679B2 (en) | 2016-10-12 | 2020-07-28 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Chargeable device and charging method |
| US10826303B2 (en) | 2016-10-12 | 2020-11-03 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Chargeable device and charging method |
| US10916951B2 (en) | 2016-10-12 | 2021-02-09 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Device to be charged and charging method |
| US11056896B2 (en) | 2016-10-12 | 2021-07-06 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Terminal and device |
| US11322949B2 (en) | 2016-10-12 | 2022-05-03 | Guangdong Oppo Mobile Telecommunication Corp., Ltd. | Battery management circuit, device to be charged, and power management method |
| US11171499B2 (en) | 2017-04-13 | 2021-11-09 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Device to be charged with multiple charging channels, charging method, and charging control circuit with multiple charging channels |
| US11631985B2 (en) | 2017-04-13 | 2023-04-18 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Device to be charged with multiple charging channels, charging method, and charging control circuit with multiple charging channels |
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Application publication date: 20130508 |