CN101510699A - Electronic device and power supply charge system thereof - Google Patents
Electronic device and power supply charge system thereof Download PDFInfo
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- CN101510699A CN101510699A CNA2009101343027A CN200910134302A CN101510699A CN 101510699 A CN101510699 A CN 101510699A CN A2009101343027 A CNA2009101343027 A CN A2009101343027A CN 200910134302 A CN200910134302 A CN 200910134302A CN 101510699 A CN101510699 A CN 101510699A
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Abstract
The invention discloses an electronic device and a power supply charging system thereof. The electronic device is connected between a power supplying device and a lithium ion battery which is used for supplying power to an electronic system. The power supply charging system comprises: an embedded controller which is connected to the lithium ion battery and used for outputting a pre-charging signal, a first charging signal and a second charging signal according to the electric quantity in the lithium ion battery; a control integrated circuit which is used for controlling the connection and disconnection of a plurality of switches according to the received electric levels of the pre-charging signal, the first charging signal and the second charging signal so as to generate one configuration of a plurality of configurations and generate a voltage value according to the configurations; a current charging integrated circuit which adopts a charging current pin to receive the voltage value and output a control signal according to the voltage value; a power converter which converts a direct current output by the power supplying device to a charging current with specific value for charging the lithium ion battery according to the received control signal.
Description
Technical field
The present invention is a kind of electronic installation and power supply charge system thereof, and You Zhiyi occupies less design space and has the power supply charge system and the related electronic device thereof of eight rank charging currents.
Background technology
See also Fig. 1, it is the circuit diagram of a known power source charging system.Power supply charge system 2 in the known electronic 25, be connected between a power supply unit (Power Adapter) 4 and one lithium ion battery 6, mainly comprise: a current charges integrated circuit 10, a control circuit 12, a power supply changeover device (Power Converter) 14 and one embedded controller (EC, embeddedcontroller) 16.Wherein, to the direct current electric current that the power supply of lithium ion battery 6 chargings is exported from power supply unit 4, power supply unit 4 can be powered to electronic installation 25 simultaneously; When power supply unit 4 does not have power supply to give electronic installation 25, via a power change-over switch (D1) conducting the electronic system 20 in the electronic installation 25 is powered by lithium ion battery 6 contained electric weight.Wherein, above-mentioned electronic installation can be notebook computer, PDA(Personal Digital Assistant) or enabled handheld phones, and lithium ion battery 6 is a rechargeable battery.
For guaranteeing the fail safe of charging, must detect electric weight actual contained in the lithium ion battery 6 at any time, and adjust the size of the charging current (Icharge) that lithium ion battery 6 is charged according to the result who is detected.At first, embedded controller (EC) 16 can detect the electric weight of lithium ion battery 6 contained reality earlier and receive detection signal by a detecting input (d).Then, export a precharging signal PRECHG, one first charging signals BATSEL_2P#, one second charging signals BATSEL_4P# to control circuit 12 according to its result.Control circuit 12 is again according to the voltage of a charging current pin ADJ2 of the corresponding change current charges of the level of above-mentioned three signals integrated circuit 10.The magnitude of voltage that current charges integrated circuit 10 is received according to its charging current pin ADJ2 again controls signal to power supply changeover device 14 via one output pin position OUT output one.Power supply changeover device 14 is again according to the control signal that is received, direct current with script AC power supply (AC Adapter) the 4 tool fixed values of being exported, be converted to the charging current Icharge that can dynamically adjust size, charge to export lithium ion battery 6 to.
With current charges integrated circuit 10, the charging current (Icharge) that lithium ion battery 6 is exported can be produced by following formula:
When Vadj2=0V～0.075V, Icharge=0A
When Vadj2=0.075V～Vref, Icharge=(Vadh2-0.075)/(25*RS2)
Wherein, Vadj2 is the voltage of charging current pin; Vref is the voltage of a reference voltage pin VREF; Vref is 5V (volt); The Vadj2 maximum can not surpass 5V.
In general, in one-period, two stages be can be divided into, precharge mode (Pre-Charging Mode) and constant charge mode (Charging Mode) are respectively lithium ion battery 6 chargings.The voltage of learning lithium ion battery 6 by detection as embedded controller (EC) 16 is during less than a particular value (for example 3V), and this moment, power supply charge system 2 entered precharge mode.In precharge mode, the precharging signal PRECHG that embedded controller (EC) 16 is exported, the level of the first charging signals BATSEL_2P#, the second charging signals BATSEL_4P# are respectively (High, Low, Low).Under this configuration, the high level precharging signal PRECHG that grid received of the MOS switch M4 in the control circuit 12 is with conducting (ON) MOS switch M4; The grid of MOS switch M2, M3 the low level first charging signals BATSEL_2P#, the second charging signals BATSEL_4P# that receive respectively will end (OFF) MOS switch M2, M3 respectively.The MOS switch M4 of conducting causes resistance R b to connect with resistance R a with resistance R 4 parallel connections earlier again, make the voltage Vref of reference voltage pin VREF of current charges integrated circuit 10 will produce the dividing potential drop Vadj2 of a tool particular value to charging current pin ADJ2, the voltage Vadj2 that this moment, current charges integrated circuit 10 was promptly received according to charging current pin ADJ2, export a corresponding power supply changeover device 14 that controls signal to, and power supply changeover device 14 charges according to the corresponding generation charging current of the control signal that is received (Icharge is generally 150mA) to lithium ion battery 6 again.
When making the voltage of lithium ion battery 6 be promoted to another particular value (for example 4.2V) by originally 3V by charging, this moment, power supply charge system 2 entered constant charge mode.In constant charge mode, the clamping of the precharging signal PRECHG that embedded controller (EC) 16 is exported is low level (Low), can pass through the virtual voltage that embedded controller (EC) 16 detects lithium ion battery 6 this moment, change and input to MOS switch M2 respectively, first charging signals BATSEL_2P# of the grid of M3 and the level of the second charging signals BATSEL_4P#, make current charges integrated circuit 10 by exporting the control signal of power supply changeover device 14 to, require charging current Icharge that power supply changeover device 14 produces the tool different values to charge to lithium ion battery 6.For instance, it is that low level (Low) and the second charging signals BATSEL_4P# are when being high level (High) that the virtual voltage that detects lithium ion batteries 6 according to embedded controller (EC) 16 makes the charging signals BATSEL_2P# that wins, the MOS switch M3 of conducting causes resistance R b to connect with resistance R a with resistance R 3 parallel connections earlier again, make the voltage Vref of reference voltage pin VREF of current charges integrated circuit 10 will produce the dividing potential drop Vadj2 of another tool particular value to charging current pin ADJ2, the voltage Vadj2 that this moment, current charges integrated circuit 10 was promptly received according to charging current pin ADJ2, export a corresponding power supply changeover device 14 that controls signal to, and power supply changeover device 14 charges according to the corresponding generation charging current of the control signal that is received (Icharge, for example 0.56A) to lithium ion battery 6 again.Same, it is that high level (High) and the second charging signals BATSEL_4P# are when being low level (Low) that the virtual voltage that detects lithium ion batteries 6 according to embedded controller (EC) 16 makes the charging signals BATSEL_2P# that wins, the MOS switch M2 of conducting causes resistance R b to connect with resistance R a with resistance R 2 parallel connections earlier again, make the voltage Vref of reference voltage pin VREF of current charges integrated circuit 10 will produce the dividing potential drop Vadj2 of another tool particular value to charging current pin ADJ2, the voltage Vadj2 that this moment, current charges integrated circuit 10 was promptly received according to charging current pin ADJ2, export a corresponding power supply changeover device 14 that controls signal to, and power supply changeover device 14 charges according to the corresponding generation charging current of the control signal that is received (Icharge, for example 1.6A) to lithium ion battery 6 again.Same, the virtual voltage that detects lithium ion batteries 6 according to embedded controller (EC) 16 makes win charging signals BATSEL_2P# and the second charging signals BATSEL_4P# be all low level (Low), and make MOS switch M2, M3 is all when ending (OFF), the voltage Vref of the reference voltage pin VREF of current charges integrated circuit 10 will produce the dividing potential drop Vadj2 of another tool particular value to charging current pin ADJ2, the voltage Vadj2 that this moment, current charges integrated circuit 10 was promptly received according to charging current pin ADJ2, export a corresponding power supply changeover device 14 that controls signal to, and power supply changeover device 14 charges according to the corresponding generation charging current of the control signal that is received (Icharge, for example 2.8A) to lithium ion battery 6 again.
In sum, operate under the precharge mode at power supply charge system 2, the configuration of the precharging signal PRECHG that embedded controller (EC) 16 is exported, the first charging signals BATSEL_2P#, the second charging signals BATSEL_4P# is (High, Low, Low).Power supply charge system 2 will produce the charging current of tool particular value (Icharge 150mA) will charge to lithium ion battery 6 this moment.Operate under the constant charge mode at power supply charge system 2, the configuration of precharging signal PRECHG, the first charging signals BATSEL_2P#, the second charging signals BATSEL_4P# can be (Low, Low, High), (Low, High, Low), (Low, Low, Low).Charging current (Icharge, 0.56A, 1.6A, 2.8A) to the lithium ion battery 6 that power supply charge system 2 will produce the tool particular value this moment charges.See also Fig. 2, it is the schematic according to the charging current Icharge of the corresponding generation of configuration of precharging signal PRECHG, the first charging signals BATSEL_2P#, the second charging signals BATSEL_4P#.
Yet, the precharging signal PRECHG that embedded controller (EC) 16 is exported, the variation of the high-low level of the first charging signals BATSEL_2P# and the second charging signals BATSEL_4P# should produce eight configurations, and the control circuit 12 in the known power supply charge system 2 only uses precharging signal PRECHG, the first charging signals BATSEL_2P# comes four different branches of corresponding generation to be depressed into the charging current pin ADJ2 of current charges integrated circuit 10 with four configurations that the second charging signals BATSEL_4P# is produced, and then only can produce four corresponding power supply changeover devices 14 that control signal to, make power supply changeover device 14 only can produce the charging current (150mA of quadravalence, 0.56A, 1.6A, 2.8A) lithium ion battery 6 is charged, so will cause precharging signal PRECHG, the waste of the first charging signals BATSEL_2P# and the second charging signals BATSEL_4P# part configuration.In addition, the control circuit of mainly being made up of MOS switch M2, M3, M4 12 also can take the excessive design space of power supply charge system 2.
Summary of the invention
In view of this, according to one aspect of the present invention, the invention provides a kind of power supply charge system, be connected between a power supply unit and the lithium ion battery and this lithium ion battery in order to an electronic system is powered, this power supply charge system comprises: an embedded controller, be connected in this lithium ion battery,, export a precharging signal, one first charging signals and one second charging signals in order to according to the contained electric weight of this lithium ion battery; One control integrated circuit according to the level of this precharging signal that is received, this first charging signals and this second charging signals, is controlled the conducting of a plurality of switches or is ended, and produces one of a plurality of configurations configuration, and according to the corresponding magnitude of voltage that produces of this configuration; One current charges integrated circuit receives this magnitude of voltage with a charging current pin, and exports a control signal according to this magnitude of voltage; And a power supply changeover device, according to this control signal that is received, the direct current current conversion that this power supply unit is exported is that a tool particular value charging current is to this lithium ion cell charging.
According to another aspect of the present invention, the invention provides a kind of power supply charge system, it can change eight configurations that produced according to the level of the precharging signal that is received, first charging signals and second charging signals, the magnitude of voltage of this charging current pin of this current charges integrated circuit of corresponding change, and then produce the charging current on eight rank, so the more segmentation of reaching charging current.In addition, because the control circuit in the known power source charging system is replaced by control integrated circuit of the present invention, therefore more can save the space of power supply charge system design.
Description of drawings
This case is able to more deep understanding by following graphic and explanation:
Fig. 1 is the circuit diagram of a known power supply charge system.
Fig. 2 is the schematic according to the charging current of the corresponding generation of configuration of precharging signal, first charging signals, second charging signals.
Fig. 3 is the circuit diagram of power supply charge system of the present invention.
Embodiment
Power supply charge system of the present invention, it mainly adopts a control integrated circuit in order to replace known control circuit 12, and this control integrated circuit can be according to the precharging signal PRECHG that is received, eight configurations that the first charging signals BATSEL_2P# and the second charging signals BATSEL_4P# are produced, produce the charging current pin ADJ2 that corresponding eight specific branches are depressed into current charges integrated circuit 10, the corresponding again output of current charges integrated circuit 10 eight rank control signal to power supply changeover device 14, and power supply changeover device 14 charges according to charging current to the lithium ion battery 6 on the corresponding generation tool of the control signal that is received eight rank again.So, can be so that charging current be more segmented and the power supply charge system spatial design is dwindled.
See also Fig. 3, it is the circuit diagram of power supply charge system of the present invention.Power supply charge system 30 in the electronic installation 35 of the present invention, be connected between power supply unit (Power Adapter) 4 and the lithium ion battery 6, mainly comprise: current charges integrated circuit 10, a control integrated circuit 32, power supply changeover device 14 and embedded controller (EC) 16.Wherein, the power supply of lithium ion battery 6 chargings is from a direct current electric current of power supply unit 4 outputs, and power supply unit 4 can be powered to electronic installation 35 simultaneously; When power supply unit 4 does not have power supply to give electronic installation 35, electronic system 20 in the electronic installation 35 is powered via a power change-over switch (D1) conducting by lithium ion battery 6 contained electric weight, and control integrated circuit 32 is connected between current charges integrated circuit 10 and the embedded controller (EC) 16, and control integrated circuit 32 can receive precharging signal PRECHG, first charging signals BATSEL_2P# and the second charging signals BATSEL_4P# of 16 outputs of embedded controller (EC) in order to represent lithium ion battery 6 contained actual electric weight.
Moreover the pin P9 of control integrated circuit 32 is connected in the charging current pin ADJ2 of current charges integrated circuit 10; Pin P10 is connected in the reference voltage pin VREF of current charges integrated circuit 10; Pin P1, pin P2, pin P3, pin P4, pin P5, pin P6, pin P7, pin P8 are connected to ground via resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12 respectively; Pin P11, pin P12, pin P13 can receive precharging signal PRECHG, the first charging signals BATSEL_#2, the second charging signals BATSEL_#4 that embedded controller (EC) 16 is exported.
Moreover, in control integrated circuit 32, pin P9 is connected with pin P1, pin P2, pin P3, pin P4, pin P5, pin P6, pin P7, pin P8 via switch S 1, switch S 2, switch S 3, switch S 4, switch S 5, switch S 6, switch S 7, switch S 8 respectively; The wherein conducting (ON) of switch S 1, switch S 2, switch S 3, switch S 4, switch S 5, switch S 6, switch S 7, switch S 8 or controlled by eight configurations (000,001,010,011,100,101,110,111) that precharging signal PRECHG, the first charging signals BATSEL_#2 and the second charging signals BATSEL_#4 are formed respectively by (OFF); That is the conducting (ON) of switch S 1, switch S 2, switch S 3, switch S 4, switch S 5, switch S 6, switch S 7, switch S 8 or can be by precharging signal PRECHG, the first charging signals BATSEL_#2 and the second charging signals BATSEL_#4 via a multiplexer/separate multiplexer to be realized by (OFF).
At first, precharging signal PRECHG, the first charging signals BATSEL_#2 and the second charging signals BATSEL_#4 that make embedded controller (EC) 16 be exported when the size that detects the virtual voltage of lithium ion battery 6 by embedded controller (EC) 16 are first configuration, for example when (000), this moment switch S 1 will for conducting (ON) remains seven switch S 2, S3, S4, S5, S6, S7, S8 will be for by (OFF).The switch S 1 of conducting (ON) will make resistance R 5 earlier in parallel with resistance R b, connect with resistance R a again, and make that the reference voltage Vref of reference voltage pin VREF of current charges integrated circuit 10 is first voltage in the dividing potential drop of charging current pin ADJ2, first voltage that this moment, current charges integrated circuit 10 was promptly received according to charging current pin position ADJ2, export one and correspondingly control signal to power supply changeover device 14, and power supply changeover device 14 charges to lithium ion battery 6 according to the charging current Icharge of corresponding generation tool first current value of the control signal that is received again.Wherein the charging current Icharge of this tool first current value can be power supply charge system 30 of the present invention and operates in the 150mA charging current Icharge that under the precharge mode lithium ion battery 6 is exported.
In like manner, precharging signal PRECHG, the first charging signals BATSEL_#2 and the second charging signals BATSEL_#4 that make embedded controller (EC) 16 be exported when the size that detects the virtual voltage of lithium ion battery 6 by embedded controller (EC) 16 are second configuration, for example when (001), this moment switch S 2 will for conducting (ON) remains seven switch S 1, S3, S4, S5, S6, S7, S8 will be for by (OFF).The switch S 2 of conducting (ON) will make resistance R 6 earlier in parallel with resistance R b, connect with resistance R a again, and make that the reference voltage Vref of reference voltage pin VREF of current charges integrated circuit 10 is second voltage in the dividing potential drop of charging current pin ADJ2, second voltage that this moment, current charges integrated circuit 10 was promptly received according to charging current pin ADJ2, export one and correspondingly control signal to power supply changeover device 14, and power supply changeover device 14 charges to lithium ion battery 6 according to the charging current Icharge of corresponding generation tool second current value of the control signal that is received again.Wherein the charging current Icharge of this tool second current value can be the charging current Icharge that power supply charge system 30 of the present invention operates in tool second current value of under the constant charge mode lithium ion battery 6 being exported.
In like manner, precharging signal PRECHG, the first charging signals BATSEL_#2 and the second charging signals BATSEL_#4 that make embedded controller (EC) 16 be exported when the size that detects the virtual voltage of lithium ion battery 6 by embedded controller (EC) 16 are the 3rd configuration, for example when (010), this moment switch S 3 will for conducting (ON) remains seven switch S 1, S2, S4, S5, S6, S7, S8 will be for by (OFF).The switch S 3 of conducting (ON) will make resistance R 7 earlier in parallel with resistance R b, connect with resistance R a again, and make that the reference voltage Vref of reference voltage pin VREF of current charges integrated circuit 10 is a tertiary voltage in the dividing potential drop of charging current pin ADJ2, the tertiary voltage that this moment, current charges integrated circuit 10 was promptly received according to charging current pin position ADJ2, export one and correspondingly control signal to power supply changeover device 14, and power supply changeover device 14 charges to lithium ion battery 6 according to the charging current Icharge of corresponding generation tool the 3rd current value of the control signal that is received again.Wherein the charging current Icharge of this tool the 3rd current value can be the charging current Icharge that power supply charge system 30 of the present invention operates in tool the 3rd current value of under the constant charge mode lithium ion battery 6 being exported.
In like manner, precharging signal PRECHG, the first charging signals BATSEL_#2 and the second charging signals BATSEL_#4 that make embedded controller (EC) 16 be exported when the size that detects the virtual voltage of lithium ion battery 6 by embedded controller (EC) 16 are the 4th configuration, for example when (011), this moment switch S 4 will for conducting (ON) remains seven switch S 1, S2, S3, S5, S6, S7, S8 will be for by (OFF).The switch S 4 of conducting (ON) will make resistance R 8 earlier in parallel with resistance R b, connect with resistance R a again, and make that the reference voltage Vref of reference voltage pin VREF of current charges integrated circuit 10 is the 4th voltage in the dividing potential drop of charging current pin ADJ2, the 4th voltage that this moment, current charges integrated circuit 10 was promptly received according to charging current pin ADJ2, export one and correspondingly control signal to power supply changeover device 14, and power supply changeover device 14 charges to lithium ion battery 6 according to the charging current Icharge of corresponding generation tool the 4th current value of the control signal that is received again.Wherein the charging current Icharge of this tool the 4th current value can be the charging current Icharge that power supply charge system 30 of the present invention operates in tool the 4th current value of under the constant charge mode lithium ion battery 6 being exported.
In like manner, precharging signal PRECHG, the first charging signals BATSEL_#2 and the second charging signals BATSEL_#4 that make embedded controller (EC) 16 be exported when the size that detects the virtual voltage of lithium ion battery 6 by embedded controller (EC) 16 are the 5th configuration, for example when (100), this moment switch S 5 will for conducting (ON) remains seven switch S 1, S2, S3, S4, S6, S7, S8 will be for by (OFF).The switch S 5 of conducting (ON) will make resistance R 9 earlier in parallel with resistance R b, connect with resistance R a again, and make that the reference voltage Vref of reference voltage pin VREF of current charges integrated circuit 10 is the 5th voltage in the dividing potential drop of charging current pin ADJ2, the 5th voltage that this moment, current charges integrated circuit 10 was promptly received according to charging current pin ADJ2, export one and correspondingly control signal to power supply changeover device 14, and power supply changeover device 14 charges to lithium ion battery 6 according to the charging current Icharge of corresponding generation tool the 5th current value of the control signal that is received again.Wherein the charging current Icharge of this tool the 5th current value can be the charging current Icharge that power supply charge system 30 of the present invention operates in tool the 5th current value of under the constant charge mode lithium ion battery 6 being exported.
In like manner, precharging signal PRECHG, the first charging signals BATSEL_#2 and the second charging signals BATSEL_#4 that make embedded controller (EC) 16 be exported when the size that detects the virtual voltage of lithium ion battery 6 by embedded controller (EC) 16 are the 6th configuration, for example when (101), this moment switch S 6 will for conducting (ON) remains seven switch S 1, S2, S3, S4, S5, S7, S8 will be for by (OFF).The switch S 6 of conducting (ON) will make resistance R 10 earlier in parallel with resistance R b, connect with resistance R a again, and make that the reference voltage Vref of reference voltage pin VREF of current charges integrated circuit 10 is the 6th voltage in the dividing potential drop of charging current pin ADJ2, the 6th voltage that this moment, current charges integrated circuit 10 was promptly received according to charging current pin position ADJ2, export one and correspondingly control signal to power supply changeover device 14, and power supply changeover device 14 charges to lithium ion battery 6 according to the charging current Icharge of corresponding generation tool the 6th current value of the control signal that is received again.Wherein the charging current Icharge of this tool the 6th current value can be the charging current Icharge that power supply charge system 30 of the present invention operates in tool the 6th current value of under the constant charge mode lithium ion battery 6 being exported.
In like manner, precharging signal PRECHG, the first charging signals BATSEL_#2 and the second charging signals BATSEL_#4 that make embedded controller (EC) 16 be exported when the size that detects the virtual voltage of lithium ion battery 6 by embedded controller (EC) 16 are the 7th configuration, for example when (110), this moment switch S 7 will for conducting (ON) remains seven switch S 1, S2, S3, S4, S5, S6, S8 will be for by (OFF).The switch S 7 of conducting (ON) will make resistance R 11 earlier in parallel with resistance R b, connect with resistance R a again, and make that the reference voltage Vref of reference voltage pin VREF of current charges integrated circuit 10 is the 7th voltage in the dividing potential drop of charging current pin ADJ2, the 7th voltage that this moment, current charges integrated circuit 10 was promptly received according to charging current pin ADJ2, export one and correspondingly control signal to power supply changeover device 14, and power supply changeover device 14 charges to lithium ion battery 6 according to the charging current Icharge of corresponding generation tool the 7th current value of the control signal that is received again.Wherein the charging current Icharge of this tool the 7th current value can be the charging current Icharge that power supply charge system 30 of the present invention operates in tool the 7th current value of under the constant charge mode lithium ion battery 6 being exported.
In like manner, precharging signal PRECHG, the first charging signals BATSEL_#2 and the second charging signals BATSEL_#4 that make embedded controller (EC) 16 be exported when the size that detects the virtual voltage of lithium ion battery 6 by embedded controller (EC) 16 are the 8th configuration, for example when (111), this moment switch S 8 will for conducting (ON) remains seven switch S 1, S2, S3, S4, S5, S6, S7 will be for by (OFF).The switch S 8 of conducting (ON) will make resistance R 12 earlier in parallel with resistance R b, connect with resistance R a again, and make that the reference voltage Vref of reference voltage pin VREF of current charges integrated circuit 10 is the 8th voltage in the dividing potential drop of charging current pin ADJ2, the 8th voltage that this moment, current charges integrated circuit 10 was promptly received according to charging current pin position ADJ2, export one and correspondingly control signal to power supply changeover device 14, and power supply changeover device 14 charges to lithium ion battery 6 according to the charging current Icharge of corresponding generation tool the 8th current value of the control signal that is received again.Wherein the charging current Icharge of this tool the 8th current value can be the charging current Icharge that power supply charge system 30 of the present invention operates in tool the 8th current value of under the constant charge mode lithium ion battery 6 being exported.
In sum, by the control integrated circuit 32 in the power supply charge system 30 of the present invention, can be according to the precharging signal PRECHG that is received, eight configurations (000 that the first charging signals BATSEL_#2 and the second charging signals BATSEL_#4 are formed, 001,010,011,100,101,110,111), and make the charging current pin ADJ2 of current charges integrated circuit 10 produce the voltage of eight tool different values, finally make power supply changeover device 14 can produce the charging current Icharge on eight rank to lithium ion battery 6, so can improve known power supply charge system 2 only can be according to the precharging signal PRECHG that is received, four configurations that the first charging signals BATSEL_#2 and the second charging signals BATSEL#4 are formed and to the charging current Icharge of lithium ion battery 6 output quadravalences, and then the more segmentation of reaching charging current Icharge.In addition, because the control circuit 12 in the known power source charging system 2 is replaced by the control integrated circuit 32 in the power supply charge system 30 of the present invention, therefore more can save the space of power supply charge system design and the charging current of eight stepwises and select.
In sum; though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can doing various changes and retouching, so protection scope of the present invention is as the criterion when looking the scope that claims define.
Claims (7)
1, a kind of power supply charge system, be connected between power supply unit and the rechargeable battery and above-mentioned rechargeable battery in order to the electronic system in electronic installation power supply, it is characterized in that, comprise:
Embedded controller is connected in above-mentioned rechargeable battery, in order to according to the contained electric weight of above-mentioned rechargeable battery, exports precharging signal, first charging signals and second charging signals;
Control integrated circuit, level according to the above-mentioned precharging signal that is received, above-mentioned first charging signals and above-mentioned second charging signals, control the conducting of a plurality of switches or end, produce one of a plurality of configurations configuration, and according to the corresponding magnitude of voltage that produces of above-mentioned configuration;
The current charges integrated circuit receives above-mentioned magnitude of voltage with the charging current pin, and with above-mentioned magnitude of voltage output control signal; And
Power supply changeover device, according to the above-mentioned control signal that is received, the direct current that above-mentioned power supply unit is exported is converted to the charging current of tool particular value above-mentioned rechargeable battery is charged.
2, power supply charge system according to claim 1 is characterized in that, the above-mentioned charging current pin position of wherein above-mentioned current charges integrated circuit is connected to ground via first resistance; Above-mentioned charging current pin is connected to the reference voltage pin of above-mentioned current charges integrated circuit via second resistance, and above-mentioned reference voltage pin is connected to reference voltage.
3, power supply charge system according to claim 2 is characterized in that, wherein above-mentioned control integrated circuit also comprises:
First pin is connected in above-mentioned charging current pin; And
Second pin is connected in above-mentioned reference voltage pin.
4, power supply charge system according to claim 1 is characterized in that, wherein above-mentioned switch is eight switches, and above-mentioned eight switches are connected to ground by eight resistance respectively.
5, power supply charge system according to claim 4, it is characterized in that, wherein above-mentioned eight switches are connected to multiplexer/separate multiplexer, and the conducting of above-mentioned eight switches or by can be via inputing to above-mentioned multiplexer/the separate above-mentioned precharging signal of multiplexer, above-mentioned first charging signals and controlling with above-mentioned second charging signals.
6, power supply charge system according to claim 1 is characterized in that, wherein above-mentioned electronic installation is notebook-computer system, personal digital assistant or enabled handheld phones.
7, power supply charge system according to claim 1 is characterized in that, wherein above-mentioned rechargeable battery is a lithium ion battery.
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| US20070103113A1 (en) * | 2005-10-31 | 2007-05-10 | Embrey Janet M | Methods of charging battery packs for cordless power tool systems |
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| US20040145348A1 (en) * | 2000-09-21 | 2004-07-29 | Constantin Bucur | Power management topologies |
| JP3886389B2 (en) * | 2002-02-07 | 2007-02-28 | 株式会社リコー | Battery pack charging device and charging method |
| US7180268B2 (en) * | 2004-03-25 | 2007-02-20 | O2Micro International Limited | Circuits capable of trickle precharge and/or trickle discharge |
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