CN104065125A - Electronic product charging system - Google Patents
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- CN104065125A CN104065125A CN201410300687.0A CN201410300687A CN104065125A CN 104065125 A CN104065125 A CN 104065125A CN 201410300687 A CN201410300687 A CN 201410300687A CN 104065125 A CN104065125 A CN 104065125A
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention provides an electronic product charging system. A working current detection circuit for monitoring the working current of the system and a charging current adjustment circuit for adjusting the charging current according to the detected working current are added on the basis of an existing circuit, so that the magnitude of the charging current can be adjusted intelligently when the electronic product is used by a user during the charging process so as to realize the condition that the battery is charged with a small current when the electronic product is in the large-current working condition and the battery is charged fast with a large current when the electronic product is in the small-current working condition, so the charging efficiency can be improved fully.
Description
Technical field
The present invention relates to charging device technical field, relate in particular to a kind of charging system of electronic product.
Background technology
Along with the update of electronic product, function is also greatly abundant, as the functions such as high-definition display screen, WIFI, 3G are also more and more designed in the middle of product, more function is in bringing advantage to the user, also can be large to the demand of electric current, present a lot of smart electronics products, all needing to charge the every days such as such as mobile phone, panel computer, wireless headset, camera, intelligent watch, intelligent button, electronic pedometer, intelligent glasses to meet user's user demand.
Please refer to Fig. 1, concerning the electronic product with usb 10, owing to being subject to the restriction of usb protocol, in the time adopting USB power supply, output current I is 500mA to the maximum.While utilizing USB interface to charge, in the time that most functional circuits 13 of electronic product are all in running order, higher to electric current demand, 13 points of functional circuits electric current I
1more than capital reaches 300mA, electronic product, in large current work state, will cause the charging current I of battery 11 thus
2diminish, the most very much not can exceed 200mA; In the time that most functional circuits 13 cut out and do not work, lower to electric current demand, now 13 points of functional circuits electric current I
1generally only have 100mA left and right, electronic product changes again little current work into, and the electric current that can be used for thus charging will reach 400mA.Existing electronic product does not possess the function of switching charging current according to operating state, general directly set fixing charging current for its charging process, and this charging current a kind of be the electric current demand that preferentially meets product function circuit, the electric current that is given to so battery charging will reduce, and causes the charging interval long; Another kind is the charging current that preferentially meets rechargeable battery, and the electric current that is given to so the functional circuit work of product will reduce, and may cause thus some large current work state (as maximal audio play multimedia file, playing games etc.) abnormal.
Therefore, need a kind of new charging system, can use electronic product on charging limit, user limit time, the charging current of automatic adjustment battery, improves charge efficiency.
Summary of the invention
The object of the present invention is to provide a kind of charging system of electronic product, adjustment charging current can use on charging limit, user limit time, improves charge efficiency.
For addressing the above problem, the invention provides a kind of charging system of electronic product, be used to the built-in power charging of electronic product, described charging system comprises USB interface and connects electric power management circuit and the functional circuit of described USB interface, described electric power management circuit can obtain external power by USB interface to be come for described built-in power charging, described functional circuit is to consume described built-in power electric power to realize the circuit of electronic product function, wherein, described charging system also comprises operating current testing circuit and charging current regulating circuit, described operating current testing circuit connects described functional circuit and detects the operating current of described functional circuit, described charging current regulating circuit comprises the multiple adjusting branch roads that connect described electric power management circuit, can select the adjusting branch road of connecting to regulate the charging current of electric power management circuit to built-in power delivery according to the detection of operating current testing circuit.
Further, described operating current testing circuit is mainly made up of sampling resistor and the current detecting chip of the current input terminal that is connected to described functional circuit, the first input end of described current detecting chip connects the current input terminal of described sampling resistor, the second input connects the current output terminal of described sampling resistor, and the output of described current detecting chip connects described functional circuit or described charge adjustment circuit.
Further, described operating current testing circuit is unidirectional comparison circuit, is mainly made up of sampled voltage circuit, reference voltage circuit and voltage comparator; The input of described sampled voltage circuit connects the current input terminal of described functional circuit, and the output of described sampled voltage circuit is connected to an input of described voltage comparator; Described reference voltage circuit is in parallel with described sampled voltage circuit, and output is connected to another input of described voltage comparator.
Further, described operating current testing circuit is two-way comparison circuit, comprises a road sampled voltage circuit, has reference voltage circuit and two voltage comparators of two outputs; The input of described sampled voltage circuit connects the current input terminal of described functional circuit, and the output of described sampled voltage circuit is connected to the positive input of a voltage comparator and the reverse input end of another voltage comparator; Described reference voltage circuit is in parallel with described sampled voltage circuit, and an output is connected to the reverse input end of a described voltage comparator, and another output is connected to the positive input of described another voltage comparator; The output of two voltage comparators connects described functional circuit or described charge adjustment circuit.
Further, described functional circuit comprises the trigger that can carry out according to the Output rusults of described operating current testing circuit low and high level triggering.
Further, described electric power management circuit is charging management chip, and the charging current output pin of described charging management chip connects described built-in power, and output charging current arranges pin and connects described charging current regulating circuit; The adjusting branch road of described charging current regulating circuit is mainly made up of resistance branch, can vary in size to change according to the operating current that detects to be switched to described output charging current the resistance branch on pin is set.
Further, in described charging current regulating circuit, be provided with road configuration resistance, a road fixed resistance and a path switching circuit, a wherein said road configuration resistance is a resistance branch, and a road configuration resistance and a path switching circuit form another resistance branch; The control end of described switching circuit is controlled by the result of described testing electric current, switch ways one end ground connection of switching circuit, and other end connection connects described output charging current by configuration resistance pin is set.
Further, described charging system also comprises with the DC charging inlet of described USB interface parallel connection and is connected USB interface and DC charging inlet identify the power supply type testing circuit that two interface charge power supplies are inserted.
Further, described power supply type testing circuit comprises the first switching circuit that connects described USB interface and described electric power management circuit input, and described switch ways has at DC charging inlet that power plug is fashionable closes; Or, described power supply type testing circuit comprises and connects the first switching circuit of described USB interface and described electric power management circuit input and be connected to DC charging inlet and the second switch circuit of described electric power management circuit input, and the first switching circuit cuts out in the time of second switch circuit turn-on.
Further, described the first switching circuit mainly comprises reverse-filling diode, triode or metal-oxide-semiconductor; Second switch main circuit will comprise triode and/or metal-oxide-semiconductor; The output of described the first switching circuit is connected with input or the output of described second switch circuit.
Compared with prior art, the invention provides a kind of charging system of electronic product, by setting up the operating current testing circuit of supervisory control system operating current and adjust the charging current regulating circuit of charging current according to the operating current detecting on available circuit basis, thereby adjustment charging current can use on charging limit, user limit time, electronic product was charged the battery with small electric stream in large current work state lower time, under little current work state time, with large electric current quick charge, can fully improve charge efficiency.
Brief description of the drawings
Fig. 1 is the electrical block diagram of a kind of electronic product of the USB of having charge function in prior art;
Fig. 2 is the charging system electrical block diagram of the embodiment of the present invention one;
Fig. 3 is a kind of operating current testing circuit schematic diagram of the embodiment of the present invention one;
Fig. 4 is the another kind of operating current testing circuit schematic diagram of the embodiment of the present invention one;
Fig. 5 is the physical circuit figure of the live part of the charging system of the embodiment of the present invention one;
Fig. 6 is the charging system electrical block diagram of the embodiment of the present invention two;
Fig. 7 is a kind of power supply type testing circuit figure of the embodiment of the present invention two;
Fig. 8 is the another kind of power supply type testing circuit figure of the embodiment of the present invention two;
Fig. 9 is another power supply type testing circuit figure of the embodiment of the present invention two;
Figure 10 is another power supply type testing circuit figure of the embodiment of the present invention two;
Figure 11 is another power supply type testing circuit figure of the embodiment of the present invention two;
Figure 12 is the physical circuit figure of the live part of the charging system of the embodiment of the present invention two;
Figure 13 is the charging system electrical block diagram of the embodiment of the present invention three.
Embodiment
For object of the present invention, feature are become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described, but the present invention can realize by different forms, should not think and just be confined to described embodiment.
Embodiment mono-
Please refer to Fig. 2, the present embodiment provides a kind of charging system of electronic product, be used to the built-in power charging of electronic product, built-in power is generally chargeable lithium cell 12, described charging system comprises usb 1 01 and connects the electric power management circuit 11 of described usb 1 01, described electric power management circuit 11 can obtain external power by usb 1 01 and charge for described battery 12, the usb 1 01 of described charging system also connects the functional circuit 13 of described electronic product, and (this functional circuit 13 refers to the general name of power consumption circuit in electronic product, it is by consuming described built-in power electric power to realize electronic product function, for example comprise control chip MCU, touch circuit, display circuit, voicefrequency circuit, warning circuit, radio communication circuit etc.), described charging system also comprises and connects described functional circuit 13 and detect the operating current testing circuit 14 of described functional circuit 13 operating currents and the operating current that detects according to operating current testing circuit 14 regulates the charging current regulating circuit 15 of the charging current that electric power management circuit 11 carries to battery 12.In the present embodiment, while being provided with MCU or low and high level trigger in functional circuit 13, the testing result of operating current testing circuit is input to the detection pin of MCU of functional circuit or the input of trigger, and the MCU of functional circuit 13 or trigger are exported corresponding signal according to the testing result of input charging current regulating circuit 15 is controlled.
Please refer to Fig. 3, described operating current testing circuit can be mainly for example, by being connected to sampling resistor R10, the R20 of current input terminal A of described functional circuit and the testing circuit that current detecting chip U1 (being ISL28005 chip) forms, the first input end R of described current detecting chip U1
s+ connect the current input terminal A (being the operating current detection node A of the functional circuit that arranges in Fig. 2) of described sampling resistor R10, R20, the second input R
s-connect described sampling resistor R10, the current output terminal B of R20, the output OUT of described current detecting chip U1 connects described functional circuit, wherein, in the time being provided with MCU or low and high level trigger in functional circuit, output OUT is connected to the detection pin STATUS_DETECT of the MCU of functional circuit, the multiple filter capacitor C1 that wherein arrange in circuit, C2, C3, C4, C5, for improving the precision of detection, capacitor C 1 can filtering operating current detection node A noise jamming, the detection collection of steady operation electric current, capacitor C 2, C3, C4, C5 can filtering electronic equipment the impact of other noises on the input of U1 input.
Please refer to Fig. 5, the electric power management circuit of the present embodiment is charging management chip U5, the charging current output pin OUT of described charging management chip U5 connects described battery J1, it (is switching circuit by metal-oxide-semiconductor Q1 that output charging current arranges pin ISET connection, this metal-oxide-semiconductor can also replace with triode), configuration resistance R 40, the charging current regulating circuit of fixed resistance R30 composition, wherein, the grid G of metal-oxide-semiconductor receives the control signal that MCU carries, the output charging current that drain D connects charging management chip U2 by configuration resistance R 40 arranges pin ISET, source S ground connection, configuration resistance R 40 and metal-oxide-semiconductor Q1 form a resistance branch, fixed resistance R30 one end ground connection, the output charging current of another termination charging management chip U5 arranges pin ISET, forms another resistance branch, thus, the charging circuit of the charging current regulating circuit of the present embodiment regulates branch road to be mainly made up of resistance branch, can vary in size to change according to the operating current detecting to be switched to described output charging current the resistance branch on pin is set.
In the present embodiment, when the U1 of the operating current testing circuit voltage ratio by sampling resistor two ends, detect when the operating current of functional circuit is larger, detection pin STATUS_DETECT to the MCU of functional circuit sends a signal, MCU receives after this signal, control pin CHG_ISET by it and send a control signal (being for example low level) to the input of charging circuit regulating circuit, make power management chip U5, with the resistance of R30, a little charging current is set, battery J1 is charged, when the U1 of the operating current testing circuit voltage ratio by sampling resistor two ends, the operating current that functional circuit detected hour, detection pin STATUS_DETECT to the MCU of functional circuit sends another signal, MCU receives after this signal, control pin CHG_ISET by it and send another control signal (being for example high level) to the input of charging circuit regulating circuit, relatively little resistance after making power management chip U5 with R30 and R40 parallel connection arranges a large charging current, battery J1 is charged, wherein electric current C6 can stablize the input control of U5 to battery J1, the input pin IN of U5 can be effective in the time that USB interface has electric power input (insertion of USB power supply), make the U5 operating state of charging.
The circuit working process that is the present embodiment comprises: adopt current detecting chip U1 to judge the operating state of electronic product by setting current value, as do not exceed set point, send a high level instruction by STATUS_DETECT mouth and be given to MCU, it is high level that MCU can control CHG_ISET,, Q1 conducting, R40, R30 parallel connection, charging current is large electric current, and large electric current is battery J1 charging; As exceed set point, and STATUS_DETECT sends a low level instruction and is given to MCU, and it is low level that MCU controls CHG_ISET, Q1 cut-off, R40, R30 are no longer in parallel, and it is R30 that resistance is set in charging, and charging current is little electric current, and little electric current is battery J1 charging.
Taking mobile phone as example, in actual applications, when state that mobile phone uses in limit USB charging limit, the APP of operation (play by the audio frequency that for example carries out max volume, play games etc.) more, cell phone system operating current can be larger, therefore connect after charge power supply (output current is 500mA to the maximum) at USB, the charging current that functional circuit need to be got is larger (electric current I 1 may reach 300mA more than) just, utilize above-mentioned charging system just can realize effective distribution of charging current, make charging current major part flow to functional circuit (being for example 300mA～400mA), small part flows to battery (being for example 100mA～200mA), in the time that the APP moving is less, such as mobile phone is in holding state (only have the basic function APP such as clock operation) or only browsing e-book or webpage, obviously functional circuit need to be got charged electrical and fails to be convened for lack of a quorum and become smaller (generally only having 100mA left and right), now utilize above-mentioned charging system intelligence to change the distribution of charging current, make charging current Main Current to battery (charging current can reach 400mA), small part flows to functional circuit (being for example 100mA).This scheme of carrying out intelligent change charging current according to system power consumption size, can make rational use of resources, and improves charge efficiency.
Please refer to Fig. 4, in the present embodiment, can also use a kind of operating current testing circuit of pure hardware, current detecting chip U1 (being for example ISL28005 chip) is realized with discrete device, replacement scheme adopts the circuit of double operational+resistance, actual is voltage comparator, the pressure drop VA that allows current flowing resistance produce compares input, there are two threshold voltage: VTHH (high threshold voltage) in this circuit, VTHL (low valve valve voltage), to input two comparator U4 with the voltage VA of VTHH and VTHL comparison, U3, if VTHL≤VA≤VTHH, amplifier output high level, as VA < VTHL or VA > VTHH, output low level.Obviously, this operating current testing circuit is two-way comparison circuit, operating current detect precision determined by the precision of the each resistance in figure, circuit specifically comprises: the sampled voltage circuit that a road is made up of sampling resistor R4, R5, the reference voltage circuit with two output VTHH, VTHL and two voltage comparator U4, U3; The input A of described sampled voltage circuit connects the current input terminal of described functional circuit, positive input 7 that output terminals A 1 is connected to voltage comparator U3 and the reverse input end 2 of voltage comparator U4; Described reference voltage circuit is rear in parallel with described sampled voltage circuit by resistance R 1, R2 and R3 series connection, an output VTHL (being arranged at the connected node of resistance R 2 and R3) is connected to the reverse input end 6 of voltage comparator U3, and another output VTHH (being arranged at the connected node of resistance R 1 and R2) is connected to the positive input 3 of voltage comparator U4; The STATUS_DETECT of the output OUT2 of two voltage comparator U3, U4, the MCU that OUT1 connects described functional circuit.
The all right unidirectional comparison circuit of operating current testing circuit of the present invention, only uses a voltage comparator, and reference voltage circuit is only provided with an output.This unidirectional comparison circuit is equivalent to the half of above-mentioned two-way testing circuit, can choose U4 testing circuit or U3 testing circuit, does not repeat them here.
In fact, the integrated charging current regulating circuit of the present embodiment in the charging management chip of some electric power management circuits, be commonly called as thering is ' the electric power management circuit of soft charger ' function, for ' soft charger ' electric power management circuit, the present embodiment also possesses can referential, be that can directly to notify this electric power management circuit be high level or low level to operating current testing circuit, electric power management circuit itself just can pass through the size of software change charging current, charging current regulating circuit part in Fig. 5 like this, only retain operating current testing circuit in Fig. 3 or Fig. 4.
The charging system of the present embodiment, by the operating current of operating current testing circuit detected electrons product, and MCU or the trigger function of expansion electronic product itself will effectively be utilized, the result that operating current testing circuit is detected produces a kind of signal of controlling charging current regulating circuit and carrying out charging current adjustment by MCU or trigger, changes thus the charging current that electric power management circuit is carried to battery.And then adjustment charging current can use on charging limit, user limit time, improve charge efficiency.
Embodiment bis-
In fact, because the charging system of embodiment mono-is to be mainly for example applicable to the USB interface of USB cable connecting electronic product, to electronic product charging (notebook computer charges to mobile phone by USB cable), under this charging modes there are some hidden danger in its 500mA charging current, therefore existing a lot of electronic product is all furnished with power supply adaptor seat and fills function, what the charging inlet wherein filling for seat in prior art had has USB form interface and DC contact pin interface concurrently, or a charging inlet can receive usb data line transferring electric power (according to the charging of USB charging specification, the for example form to mobile phone charging by notebook computer) and receive DC adaptor charge (DC contact pin interface and USB interface are integrated into one), for clearer description this programme, herein as long as electronic equipment can carry out DC charging (filling soon the charging of form), no matter interface be DC socket or USB form be directly defined as DC interface, and similar notebook computer is directly defined as USB interface to this charging inlet according to the charging of USB charging specification of mobile phone charging.
Therefore, the present embodiment provides a kind of charging system, can compatible USB charging modes and DC charging modes.
This enforcement provides a kind of charging system, is with the difference of embodiment mono-, comprises two charging inlets that receive two kinds of charge power supplies and the power supply type testing circuit that can identify charge power supply.Two kinds of charging inlets are usb 1 01 and DC interface 102, and described power supply type testing circuit comprises the first switching circuit that connects described USB interface and described electric power management circuit input, and described switch ways has at DC charging inlet that power plug is fashionable closes; Or, described power supply type testing circuit comprises and connects the first switching circuit of described USB interface and described electric power management circuit input and be connected to DC charging inlet and the second switch circuit of described electric power management circuit input, and the first switching circuit cuts out in the time of second switch circuit turn-on.
Please refer to Fig. 7 to Figure 11, the first switching circuit comprises reverse-filling diode, triode or metal-oxide-semiconductor; Second switch main circuit will comprise triode and/or metal-oxide-semiconductor; The output of described the first switching circuit is connected with input or the output of described second switch circuit.
Please refer to Fig. 7, a kind of power supply type testing circuit has the first switching circuit, described the first switching circuit is the reverse-filling diode D1 that connects usb 1 01 and electric power management circuit input, when being connected to external power supply in USB interface but while thering is no external power supply on DC interface, and D1 conducting; In the time being connected to external power supply on DC interface but thering is no external power supply in USB interface, D1 turn-offs, and prevents that electric current from pouring in down a chimney simultaneously.In the time that DC interface and USB interface are all connected to external power supply, D1 turn-offs, and prevents that electric current from pouring in down a chimney simultaneously.
Please refer to Fig. 8, another kind of power supply type testing circuit comprises and connects the first switching circuit of described USB interface and described electric power management circuit input and be connected to DC charging inlet and the second switch circuit of described electric power management circuit input, the output of the first switching circuit is in parallel with second switch circuit output end, and the first switching circuit cuts out in the time of second switch circuit turn-on.Described the first switching circuit is reverse-filling diode D1, and described second switch circuit is metal-oxide-semiconductor.
Please refer to Fig. 9, another power supply type testing circuit comprises and connects the first switching circuit of described USB interface and described electric power management circuit input and be connected to DC charging inlet and the second switch circuit of described electric power management circuit input, the output of the first switching circuit is in parallel with second switch circuit output end, and the first switching circuit cuts out in the time of second switch circuit turn-on.Described the first switching circuit is reverse-filling diode D1, and described second switch circuit is metal-oxide-semiconductor.
Please refer to Figure 10, another power supply type testing circuit comprises and connects the first switching circuit of described USB interface and described electric power management circuit input and be connected to DC charging inlet and the second switch circuit of described electric power management circuit input, the output of the first switching circuit is in parallel with second switch circuit output end, and the first switching circuit cuts out in the time of second switch circuit turn-on.Described the first switching circuit is metal-oxide-semiconductor, and described second switch circuit is reverse-filling diode.
Please refer to Figure 11, another power supply type testing circuit comprises and connects the first switching circuit of described USB interface and described electric power management circuit input and be connected to DC charging inlet and the second switch circuit of described electric power management circuit input.The power supply type testing circuit of the present embodiment adopts a fixed resistance R50, a configuration resistance R 60 and two switching circuit Q1, Q2 to be formed by connecting.The setting requirement of the charging priority level according to electronic product to DC and two kinds of charge modes of USB, arranges first via charging inlet DC and connects charging priority level Di mono-tunnel charge power supply, and the charge power supply of for example exporting by adapter is to DC interface; The second road charging inlet USB is set and connects charging priority level Gao mono-tunnel charge power supply, the USB charge power supply that for example main equipment accesses by usb data line.Charging inlet DC is connected to the control end of second switch circuit Q1, or the bleeder circuit via resistance R 70, R80 composition is connected to the control end of second switch circuit Q1, utilize resistance R 70, R80 to carry out after dividing potential drop the charge power supply being linked on charging inlet DC, transfer to the control end of second switch circuit Q1, control its switch ways of second switch circuit Q1 conducting.By switch ways one end ground connection of described second switch circuit Q1, the other end connects the input of electric power management circuit by configuration resistance R 60, and the output of configuration resistance R 60 is also by fixed resistance R5 ground connection.The second road charging inlet USB is connected to the control end of the first switching circuit Q2, described control end can also further pass through pull down resistor R90 ground connection, by switch ways one end ground connection of the first switching circuit Q2, the other end is connected to the control end of second switch circuit Q1.The output of the first switching circuit Q2 connects the input of described second switch circuit Q1.
As a kind of preferred circuit design of described switching circuit Q1, Q2, can select the switch elements such as metal-oxide-semiconductor, triode or controllable silicon to carry out the specific design of circuit.The present embodiment is specifically described as example to adopt N-channel MOS pipe to design described switching circuit Q1, Q2.
The grid of metal-oxide-semiconductor Q2 is connected to charging inlet USB, and by pull down resistor R90 ground connection, by the source ground of metal-oxide-semiconductor Q2, drain electrode connects the grid of metal-oxide-semiconductor Q1, and is connected to charging inlet DC by divider resistance R70 respectively, by divider resistance R80 ground connection.By the source ground of metal-oxide-semiconductor Q1, drain electrode is connected to the input of electric power management circuit by configuration resistance R 60.
When there being charge power supply access on charging inlet DC, and on charging inlet USB, there is no charge power supply when access, metal-oxide-semiconductor Q1 saturation conduction, metal-oxide-semiconductor Q2 keeps off state, the resistance that is now linked into the equivalent resistance of electric power management circuit equals the resistance in parallel of fixed resistance R50 and configuration resistance R 60, and can to identify be that charging inlet has charge power supply access to electric power management circuit thus.
When there is no charge power supply access on charging inlet DC, and while having charge power supply access on charging inlet USB, metal-oxide-semiconductor Q2 saturation conduction, drags down the grid potential of metal-oxide-semiconductor Q1, makes metal-oxide-semiconductor Q1 keep off state.Now, the resistance that is linked into the equivalent resistance of electric power management circuit input equals the resistance of fixed resistance R50, can judge that thus USB interface has charge power supply access.
In the time having charge power supply access on charging inlet DC and USB, due to metal-oxide-semiconductor Q1 saturation conduction, therefore metal-oxide-semiconductor Q2 keeps off state simultaneously, and electric power management circuit preferentially selects DC charge mode to the battery charging in electronic product.
Certainly, for the specific design mode of switching circuit in above-mentioned the first and the second resistance configuration circuit, can adopt equally the switch elements such as triode, metal-oxide-semiconductor or controllable silicon to copy the circuit connecting mode shown in Fig. 4 to carry out specific design, the present embodiment is not limited in above giving an example.
DC interface and USB interface can be combined into one on interface structure simultaneously, realize compatibility, and two kinds of interfaces in Fig. 7 to Figure 11 represent different connecting terminals, in order to trigger the connection with the different charging circuits of USB in internal DC.
Further, because the charging current of DC charging is larger, so even when the operating current that operating current testing circuit detects is larger, also can adopt larger charging current to charge, can not affect the normal use of electronic product.Simultaneously due to electric power management circuit or treat the existence of the functional circuit of MCU, the present embodiment can be in the time that the large electric current seat that outside access detected fills, further make priority setting, when outside seat fills while being detected, its access detects as high priority, the Output rusults priority of operating current detecting unit is set to low, preferentially charges to battery with large charging current.Now, if electric power management circuit has " soft charger " function or functional circuit has MCU, electric power management circuit or MCU can, directly in conjunction with the input of DC input testing result and charging current regulating circuit, preferentially export large charging current to battery according to DC testing result.If electric power management circuit does not have software function, functional circuit does not have MCU yet, now can be with reference to Figure 12, in charging current regulating circuit, directly expand priority circuit, realize the preferential selection of DC charging, for example in charging current regulating circuit, increase by an OR circuit, two input receives result (high level " 1 " the expression DC charging that DC charging detects, low level " 0 " represents USB charging) and the testing result of operating current testing circuit (high level " 1 " represents to need large current state of charge, low level " 0 " represents low current charge state), or the input condition of gate output terminal is as shown in the table:
| V_DC | CHC_SET | Or door output |
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
Can realize under DC charge mode and directly charging the battery with large charging current thus.
The charging system of the present embodiment, compared to embodiment mono-, goes for having the electronic product of two kinds of charging inlets, has better experience than the charging circuit of embodiment mono-.
Embodiment tri-
Please refer to Figure 13, the difference of the charging system of the present embodiment and embodiment mono-and embodiment bis-is, the MCU that the functional circuit of the present embodiment does not carry or trigger, therefore the output of operating current testing circuit 14 directly connects charging current regulating circuit 15, control charging current regulating circuit and regulate charging current, adjustment charging current can use on charging limit, user limit equally time, electronic product was charged the battery with small electric stream in large current work state lower time, under little current work state time with large electric current quick charge, fully improve charge efficiency.
The charging system of the present embodiment also can reference example two expanded functions, charge with compatible DC charging and DC.The physical circuit of each part all can reference example one and the physical circuit design of embodiment bis-, and the scope of application is wider.
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 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 (10)
1. the charging system of an electronic product, be used to the built-in power charging of electronic product, described charging system comprises USB interface and connects electric power management circuit and the functional circuit of described USB interface, described electric power management circuit can obtain external power by USB interface to be come for described built-in power charging, described functional circuit is to consume described built-in power electric power to realize the circuit of electronic product function, it is characterized in that, described charging system also comprises operating current testing circuit and charging current regulating circuit, described operating current testing circuit connects described functional circuit and detects the operating current of described functional circuit, described charging current regulating circuit comprises the multiple adjusting branch roads that connect described electric power management circuit, can select the adjusting branch road of connecting to regulate the charging current of electric power management circuit to built-in power delivery according to the detection of operating current testing circuit.
2. charging system as claimed in claim 1, it is characterized in that, described operating current testing circuit is mainly made up of sampling resistor and the current detecting chip of the current input terminal that is connected to described functional circuit, the first input end of described current detecting chip connects the current input terminal of described sampling resistor, the second input connects the current output terminal of described sampling resistor, and the output of described current detecting chip connects described functional circuit or described charge adjustment circuit.
3. charging system as claimed in claim 1, is characterized in that, described operating current testing circuit is unidirectional comparison circuit, is mainly made up of sampled voltage circuit, reference voltage circuit and voltage comparator; The input of described sampled voltage circuit connects the current input terminal of described functional circuit, and described sampled voltage circuit output end is connected to an input of described voltage comparator; Described reference voltage circuit is in parallel with described sampled voltage circuit, and output is connected to another input of described voltage comparator.
4. charging system as claimed in claim 1, is characterized in that, described operating current testing circuit is two-way comparison circuit, comprises a road sampled voltage circuit, has reference voltage circuit and two voltage comparators of two outputs; The output that the input of described sampled voltage circuit connects the current input terminal of described functional circuit, described sampled voltage circuit is connected to the positive input of a voltage comparator and the reverse input end of another voltage comparator; Described reference voltage circuit is in parallel with described sampled voltage circuit, and an output is connected to the reverse input end of a described voltage comparator, and another output is connected to the positive input of described another voltage comparator; The output of two voltage comparators connects described functional circuit or described charge adjustment circuit.
5. the charging system as described in any one in claim 2 to 4, is characterized in that, described functional circuit comprises the trigger that can carry out according to the Output rusults of described operating current testing circuit low and high level triggering.
6. charging system as claimed in claim 1, it is characterized in that, described electric power management circuit is charging management chip, and the charging current output pin of described charging management chip connects described built-in power, and output charging current arranges pin and connects described charging current regulating circuit; The adjusting branch road of described charging current regulating circuit is mainly made up of resistance branch, can vary in size to change according to the operating current that detects to be switched to described output charging current the resistance branch on pin is set.
7. charging system according to claim 6, it is characterized in that: in described charging current regulating circuit, be provided with road configuration resistance, a road fixed resistance and a path switching circuit, a wherein said road fixed resistance is a resistance branch, and a road configuration resistance and a path switching circuit form another resistance branch; The control end of described switching circuit is controlled by the result of described testing electric current, switch ways one end ground connection of switching circuit, and other end connection connects described output charging current by configuration resistance pin is set.
8. charging system as claimed in claim 1, is characterized in that, described charging system also comprises the DC charging inlet in parallel with described USB interface, and connects USB interface and DC charging inlet and identify the power supply type testing circuit that two interface charge power supplies are inserted.
9. charging system as claimed in claim 8, is characterized in that, described power supply type testing circuit comprises the first switching circuit that connects described USB interface and described electric power management circuit input, and described switch ways has at DC charging inlet that power plug is fashionable closes; Or, described power supply type testing circuit comprises and connects the first switching circuit of described USB interface and described electric power management circuit input and be connected to DC charging inlet and the second switch circuit of described electric power management circuit input, and the first switching circuit cuts out in the time of second switch circuit turn-on.
10. charging system as claimed in claim 9, is characterized in that, described the first switching circuit mainly comprises reverse-filling diode, triode or metal-oxide-semiconductor; Second switch main circuit will comprise reverse-filling diode, triode and/or metal-oxide-semiconductor; The output of described the first switching circuit is connected with input or the output of described second switch circuit.
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| CN115425706B (en) * | 2022-04-28 | 2023-08-25 | 荣耀终端有限公司 | Charging method and related electronic equipment |
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