CN104065125B - A kind of charging system of electronic product - Google Patents

A kind of charging system of electronic product Download PDF

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Publication number
CN104065125B
CN104065125B CN201410300687.0A CN201410300687A CN104065125B CN 104065125 B CN104065125 B CN 104065125B CN 201410300687 A CN201410300687 A CN 201410300687A CN 104065125 B CN104065125 B CN 104065125B
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circuit
charging
current
output
resistance
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CN201410300687.0A
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Chinese (zh)
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CN104065125A (en
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徐照明
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青岛歌尔声学科技有限公司
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

The present invention provides a kind of charging system of electronic product, the charging current for detecting circuit by setting up the operating current of monitoring system operating current on the basis of available circuit and adjusting charging current according to the operating current of detection adjusts circuit, adjustment charging current during so as to be used when user is in charging, so that electronic product is charged the battery when being under high current working condition with smaller current, with high current quick charge when under low current working condition, charge efficiency can be fully improved.

Description

A kind of charging system of electronic product

Technical field

The present invention relates to charging device technical field, more particularly to a kind of charging system of electronic product.

Background technology

With the update of electronic product, function also extreme enrichment, such as high-definition display screen, WIFI, 3G function is also got over It is designed into come more among product, more functions are while bringing advantage to the user, and the demand to electric current also can be big, Present many smart electronicses products, such as mobile phone, tablet personal computer, wireless headset, camera, intelligent watch, Intelligent button, electronics Pedometer, intelligent glasses etc. are required for charge that daily the use demand of user could be met.

Fig. 1 is refer to, for the electronic product with usb 10, due to being limited by usb protocol, when using USB During power supply, output current I is 500mA to the maximum.When being charged using USB interface, when most functional circuits 13 of electronic product It is higher to current needs when being in working condition, 13 points of functional circuit electric current I1More than 300mA, electronics will be reached Product is in high current working condition, thus may result in the charging current I of battery 112Diminish, maximum is not over 200mA; When most functional circuits 13 close without work when, it is relatively low to current needs, now 13 points of functional circuit electric current I1Typically 100mA or so is only had, electronic product is changed to low current work again, it is possible thereby to will reach 400mA for the electric current charged. Existing electronic product does not possess according to working condition to switch the function of charging current, is typically directly set for its charging process Fixed charging current, and it is the preferential current needs for meeting product function circuit that the charging current is a kind of, then it is given to electricity The electric current of pond charging will be reduced, and cause the charging interval long;Another is the preferential charging current for meeting rechargeable battery, then Being given to the electric current of the functional circuit work of product will be reduced, and thus be likely to result in some high current working conditions (such as maximum Audio plays multimedia file, plays game etc.) it is abnormal.

Accordingly, it would be desirable to which a kind of new charging system, automatically intelligent when can use electronic product when user is in charging The charging current of battery is adjusted, charge efficiency is improved.

The content of the invention

It is an object of the invention to provide a kind of charging system of electronic product, intelligence when can be used when user is in charging Charging current can be adjusted, charge efficiency is improved.

To solve the above problems, the present invention provides a kind of charging system of electronic product, for built in electronic product Power source charges, the charging system includes the electric power management circuit and functional circuit of USB interface and the connection USB interface, The electric power management circuit can obtain external power by USB interface to charge for the built-in power, the functional circuit To consume the built-in power electric power to realize the circuit of electronic product function, wherein, the charging system also includes work electricity Current detection circuit and charging current regulation circuit, the operating current detection circuit connect the functional circuit and detect the work( The operating current of energy circuit, the charging current regulation circuit includes the multiple regulation branch roads for connecting the electric power management circuit, It can detect that the detection of circuit selects the regulation branch road connected to manage circuit with regulation power supply according to operating current defeated to built-in power The charging current sent.

Further, the operating current detection circuit is main by being connected to adopting for the current input terminal of the functional circuit Sample resistance and current detecting chip composition, the first input end of the current detecting chip connect the electric current of the sampling resistor Input, the second input connects the current output terminal of the sampling resistor, the output end connection institute of the current detecting chip State functional circuit or the charge adjustment circuit.

Further, the operating current detection circuit is unidirectional comparison circuit, mainly by sampled voltage circuit, with reference to electricity Volt circuit and voltage comparator composition;The input of the sampled voltage circuit connects the electric current input of the functional circuit End, the output end of the sampled voltage circuit is connected to an input of the voltage comparator;The reference voltage circuit With the sampled voltage circuit in parallel, output end is connected to another input of the voltage comparator.

Further, operating current detection circuit is two-way comparison circuit, including all the way sampled voltage circuit, have The reference voltage circuit and two voltage comparators of two output ends;The input of the sampled voltage circuit connects the work( Can circuit current input terminal, the output end of the sampled voltage circuit be connected to the positive input of a voltage comparator with And the reverse input end of another voltage comparator;The reference voltage circuit and the sampled voltage circuit in parallel, one defeated Go out end and be connected to the reverse input end of one voltage comparator, another output end be connected to another described voltage ratio compared with The positive input of device;The output end of two voltage comparators connects the functional circuit or the charge adjustment circuit.

Further, the functional circuit includes to detect that the output result of circuit carries out height according to the operating current The trigger of low level triggering.

Further, the electric power management circuit is charging management chip, and the charging current of the charging management chip is defeated Go out pin and connect the built-in power, output charging current sets pin to connect described charging current regulation circuit;It is described to fill The regulation branch road of electric current regulating circuit is mainly made up of resistance branch, can be according to inspection

Further, it is provided with configuration resistance, all the way fixed resistance and one all the way in charging current regulation circuit Path switching circuit, wherein the resistance of configuration all the way is a resistance branch, configures resistance and path switching circuit composition all the way Another resistance branch;The control end of the on-off circuit is controlled by the result of the detection operating current, and on-off circuit is opened Path one end ground connection is closed, the other end connects through the configuration resistance connection output charging current and sets pin.

Further, the charging system also includes the DC charging inlet in parallel with the USB interface and is connected USB connecing Mouth and DC charging inlets and the power supply type detection circuit for recognizing the insertion of two interface charge power supplies.

Further, the power supply type detection circuit includes connecting the USB interface and the electric power management circuit is defeated Enter the first switch circuit at end, the switch ways are closed when DC charging inlets have power supply insertion;Or, the power supply type Detection circuit includes the first switch circuit of the connection USB interface and the electric power management circuit input and is connected to DC The second switch circuit of charging inlet and the electric power management circuit input, and first switch circuit leads in second switch circuit Closed when logical.

Further, the first switch circuit mainly includes reverse-filling diode, triode or metal-oxide-semiconductor;Second opens Powered-down road mainly includes triode and/or metal-oxide-semiconductor;The output end of the first switch circuit is defeated with the second switch circuit Enter end or output end connection.

Compared with prior art, the present invention provides a kind of charging system of electronic product, by the basis of available circuit Set up the operating current detection circuit of monitoring system operating current and the charging of charging current is adjusted according to the operating current of detection Current regulating circuit, adjustment charging current during so as to be used when user is in charging so that at electronic product Charged the battery, quickly filled with high current when under low current working condition with smaller current when under high current working condition Electricity, can fully improve charge efficiency.

Brief description of the drawings

Fig. 1 is a kind of electrical block diagram of the electronic product with USB charge functions in the 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 detection circuit diagram of the embodiment of the present invention one;

Fig. 4 is another operating current detection circuit 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 detection circuit diagram of the embodiment of the present invention two;

Fig. 8 is another power supply type detection circuit diagram of the embodiment of the present invention two;

Fig. 9 is another power supply type detection circuit diagram of the embodiment of the present invention two;

Figure 10 is another power supply type detection circuit diagram of the embodiment of the present invention two;

Figure 11 is another power supply type detection circuit diagram 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

To become apparent the purpose of the present invention, feature, the embodiment to the present invention is made below in conjunction with the accompanying drawings Further instruction, however, the present invention can be realized with different forms, it is not considered that being simply confined to described embodiment.

Embodiment one

Fig. 2 is refer to, the present embodiment provides a kind of charging system of electronic product, for the built-in power for electronic product Charging, built-in power is generally chargeable lithium cell 12, and the charging system includes usb 1 01 and the connection USB connects Mouthfuls 101 electric power management circuit 11, the electric power management circuit 11 can obtain external power come for institute by usb 1 01 State battery 12 to charge, the usb 1 01 of the charging system is also connected with the functional circuit 13 of the electronic product (function electricity Road 13 refers to the general name of power consuming circuit in electronic product, and it is by consuming the built-in power electric power to realize electronic product work( Can, such as including control chip MCU, touch circuit, display circuit, voicefrequency circuit, warning circuit, radio communication circuit etc.), The charging system also includes connecting the functional circuit 13 and detects the operating current inspection of the operating current of functional circuit 13 It is defeated to battery 12 that slowdown monitoring circuit 14 and the operating current regulation power supply detected according to operating current detection circuit 14 manage circuit 11 The charging current regulation circuit 15 for the charging current sent.In the present embodiment, MCU or low and high level are provided with functional circuit 13 During trigger, the testing result of operating current detection circuit is input to the MCU of functional circuit detection pin or trigger Input, the MCU or trigger of functional circuit 13 export corresponding signal according to the testing result of input to charging current Regulation circuit 15 is controlled.

Fig. 3 is refer to, the operating current detection circuit can be main defeated by being connected to the electric current of the functional circuit Enter to hold A sampling resistor R10, R20 and the detection circuit of current detecting chip U1 (being, for example, ISL28005 chips) composition, institute State current detecting chip U1 first input end RS+ connection described sampling resistor R10, R20 current input terminal A (are i.e. set in Fig. 2 The operating current detection node A for the functional circuit put), the second input RS- connection described sampling resistor R10, R20 electric current are defeated Go out and hold B, the output end OUT connections functional circuit of the current detecting chip U1, wherein, when being provided with functional circuit MCU or during low and high level trigger, output end OUT is connected to the MCU of functional circuit detection pin STATUS_DETECT, Multiple filter capacitor C1, C2, C3, C4, the C5 wherein set in circuit, the precision for improving detection, electric capacity C1 can be filtered out Operating current detection node A noise jamming, the detection collection of steady operation electric current, electric capacity C2, C3, C4, C5 can filter out electricity The influence that other noises of sub- equipment are inputted to U1 inputs.

Fig. 5 is refer to, the electric power management circuit of the present embodiment is charging management chip U5, the charging management chip U5's The charging current output pin OUT connections battery J1, output charging current sets pin ISET connections (to be opened by metal-oxide-semiconductor Q1 Powered-down road, the metal-oxide-semiconductor may be replaced by triode), configuration resistance R40, the charging current regulation electricity of fixed resistance R30 compositions Road, wherein, the grid G of metal-oxide-semiconductor receives the control signal of MCU conveyings, and drain D is by configuring resistance R40 connection Charge Management cores Piece U2 output charging current sets pin ISET, source S ground connection;Configure resistance R40 and metal-oxide-semiconductor Q1 and constitute a resistance branch Road;Fixed resistance R30 one end is grounded, and another termination charging management chip U5 output charging current sets pin ISET, constitutes Another resistance branch;Thus, the charging circuit regulation branch road of the charging current regulation circuit of the present embodiment is main by resistance branch Road is constituted, and the operating current that energy basis is detected is of different sizes and change is switched to the output charging current and set on pin Resistance branch.

In the present embodiment, when operating current detects the U1 of circuit by the voltage ratio at sampling resistor two ends compared with detecting work( When the operating current of energy circuit is larger, a signal, MCU are sent to the MCU of functional circuit detection pin STATUS_DETECT Receive after this signal, sending a control by its controlling switch CHG_ISET inputs for adjusting circuit to charging circuit believes Number (be, for example, low level) so that power management chip U5 sets a small charging current with R30 resistance, is filled to battery J1 Electricity;When operating current detects the U1 of circuit by the voltage ratio at sampling resistor two ends compared with detecting the operating current of functional circuit When smaller, another signal is sent to the MCU of functional circuit detection pin STATUS_DETECT, MCU receives this signal Afterwards, sending another control signal by its controlling switch CHG_ISET inputs for adjusting circuit to charging circuit (is, for example, High level) so that power management chip U5 sets a big charging current with relatively small resistances of the R30 and R40 after in parallel, Battery J1 is charged, wherein electric capacity C6 can stablize inputs of the U5 to battery J1 and control, and U5 input pin IN can connect in USB It is effective when (USB power source insertion) that mouth has electric power to input so that U5 carries out charging working condition.

That is the circuit course of work of the present embodiment includes:Electricity is judged by setting electric current value using current detecting chip U1 The working condition of sub- product, such as not less than setting value, sends a high level instruction by STATUS_DETECT mouthfuls and is given to MCU, MCU can control CHG_ISET to be high level, and Q1 conductings, R40, R30 are in parallel, and charging current is high current, and high current is battery J1 Charging;Such as exceed setting value, STATUS_DETECT sends a low level instruction and is given to MCU, and MCU controls CHG_ISET to be low Level, Q1 cut-offs, R40, R30 are no longer in parallel, and charging sets resistance as R30, and charging current is low current, and low current is battery J1 Charging.

By taking mobile phone as an example, in actual applications, when mobile phone is in the state used when USB charges, the APP (examples of operation The audio for such as carrying out max volume is played, plays game) it is more, cell phone system operating current can be bigger, therefore connect and fill in USB After power supply (output current is 500mA to the maximum), functional circuit needs the charging current got, and bigger (electric current I1 may reach To more than 300mA), effective distribution of charging current can be just realized using above-mentioned charging system so that charging current is most of Functional circuit (being, for example, 300mA~400mA) is flowed to, small part flows to battery (being, for example, 100mA~200mA);When motion When APP is less, it is in holding state (basic function APP is in operation only clock) such as mobile phone or is only browsing electronics Book or webpage, it is clear that functional circuit, which needs to get charging current, can become smaller (typically only having 100mA or so), now The distribution of charging current can intelligently be changed using above-mentioned charging system so that charging current flows mostly to battery (charging current 400mA can be reached), small part flows to functional circuit (being, for example, 100mA).It is this intelligently to be changed according to system power consumption size The scheme of charging current, can rationally utilize resource, improve charge efficiency.

It refer in Fig. 4, the present embodiment, a kind of operating current of pure hardware can also be used to detect circuit, current detecting Chip U1 (being, for example, ISL28005 chips) is realized that alternative solution uses the circuit of double operational+resistance with discrete device, Reality is voltage comparator, and the pressure drop VA for allowing current flowing resistance to produce compares input, and the circuit has two threshold voltages: VTHH (high threshold value), VTHL (low threshold voltage), by the voltage VA compared with VTHH and VTHL input two comparator U4, U3, if VTHL≤VA≤VTHH, amplifier output high level;Such as VA < VTHL or VA > VTHH, then low level is exported.Obviously, Operating current detection circuit is two-way comparison circuit, and the precision of operating current detection is determined by the precision of each resistance in figure, Circuit is specifically included:The sampled voltage circuit that is made up of all the way sampling resistor R4, R5, with two output ends VTHH, VTHL Reference voltage circuit and two voltage comparators U4, U3;The input A connections functional circuit of the sampled voltage circuit Current input terminal, output terminals A 1 be connected to voltage comparator U3 positive input 7 and voltage comparator U4 it is reverse defeated Enter end 2;The reference voltage circuit by resistance R1, R2 and R3 series connection after with the sampled voltage circuit in parallel, an output end VTHL (connecting node for being arranged at resistance R2 and R3) is connected to voltage comparator U3 reverse input end 6, another output end VTHH (connecting node for being arranged at resistance R1 and R2) is connected to voltage comparator U4 positive input 3;Two voltage ratios compared with Device U3, U4 output end OUT2, OUT1 connect the MCU of functional circuit STATUS_DETECT.

The operating current detection circuit of the present invention can also unidirectional comparison circuit, only with a voltage comparator, with reference to electricity Volt circuit is provided only with an output end.The unidirectional comparison circuit can choose U4 equivalent to the half of above-mentioned two-way detection circuit Circuit or U3 detection circuits are detected, be will not be repeated here.

In fact, being integrated with the charging current regulation electricity of the present embodiment in the charging management chip of some electric power management circuits Road, is commonly called as with ' the electric power management circuit of soft charger ' functions, for ' soft charger ' electric power management circuits, this implementation Example, which also possesses referring to property, i.e. operating current detection circuit, can directly notify the electric power management circuit to be high level or low electricity Flat, electric power management circuit can inherently change the charging current regulation electricity in the size of charging current, such Fig. 5 by software Road part, only retains operating current detection circuit in Fig. 3 or Fig. 4.

The charging system of the present embodiment, the operating current of electric circuit inspection electronic product is detected by operating current, and will be had The result that operating current detects electric circuit inspection is passed through MCU by effect using electronic product MCU in itself or trigger function is extended Or trigger produces a kind of signal for controlling charging current regulation circuit to carry out charging current adjustment, thus changes power management The charging current that circuit is conveyed to battery.And then adjustment charging current is big when can be used when user is in charging It is small, improve charge efficiency.

Embodiment two

Actually, it is applied to the USB interface that USB cable connects electronic product because the charging system of embodiment one is mainly Charged (for example notebook computer is charged by USB cable to mobile phone) to electronic product, its 500mA charges under this charging modes There are some hidden danger in electric current, therefore existing many electronic products are equipped with power supply adaptor seat and fill function, wherein prior art In have USB forms interface and DC contact pin interfaces concurrently for what the charging inlet that seat fills had, or a charging inlet can be received USB data line transmission electric power (i.e. according to USB charging specifications charging, the form for example charged by notebook computer to mobile phone) with And D/C adapter charging (DC contact pin interfaces are integrated into one kind with USB interface) is received, for clearer description this programme, this paper As long as in electronic equipment can carry out DC chargings (charging for filling form soon), no matter interface is the straight of DC sockets or USB forms Connect and be defined as DC interfaces, and this charging inlet charged according to USB charging specifications that similar notebook computer charges to mobile phone Directly it is defined as USB interface.

Therefore a kind of charging system is present embodiments provided, can compatibility USB charging modes and DC charging modes.

This implementation provides a kind of charging system, and the difference with embodiment one is, including receives the two of two kinds of charge power supplies Individual charging inlet and the power supply type detection circuit that charge power supply can be recognized.Two kinds of charging inlets be usb 1 01 and DC interfaces 102, power supply type detection circuit includes connecting the of the USB interface and the electric power management circuit input One on-off circuit, the switch ways are closed when DC charging inlets have power supply insertion;Or, the power supply type detects circuit Including connecting the first switch circuit of the USB interface and the electric power management circuit input and being connected to DC charging inlets With the second switch circuit of the electric power management circuit input, and first switch circuit closes in second switch circuit turn-on Close.

Fig. 7 to Figure 11 is refer to, first switch circuit includes reverse-filling diode, triode or metal-oxide-semiconductor;Second switch Circuit mainly includes triode and/or metal-oxide-semiconductor;The output end of the first switch circuit and the input of the second switch circuit End or output end connection.

Fig. 7 is refer to, a kind of power supply type detection circuit has first switch circuit, and the first switch circuit is connection The reverse-filling diode D1 of usb 1 01 and electric power management circuit input, when being connected to external power supply on USB interface but DC connects When there is no external power supply on mouthful, D1 conductings;When be connected on DC interfaces there is no external power supply on external power supply but USB interface when D1 close It is disconnected, while preventing electric current from pouring in down a chimney.When DC interfaces and USB interface are connected to external power supply, D1 shut-offs, while preventing electric current from falling Fill.

Fig. 8 is refer to, another power supply type detection circuit includes connecting the USB interface and the electric power management circuit The first switch circuit of input and the second switch electricity for being connected to DC charging inlets and the electric power management circuit input Road, the output end of first switch circuit is in parallel with second switch circuit output end, and first switch circuit is in second switch circuit Closed during conducting.The first switch circuit is reverse-filling diode D1, and the second switch circuit is metal-oxide-semiconductor.

Fig. 9 is refer to, another power supply type detection circuit includes connecting the USB interface and the electric power management circuit The first switch circuit of input and the second switch electricity for being connected to DC charging inlets and the electric power management circuit input Road, the output end of first switch circuit is in parallel with second switch circuit output end, and first switch circuit is in second switch circuit Closed during conducting.The first switch circuit is metal-oxide-semiconductor, and the second switch circuit is metal-oxide-semiconductor.

Figure 10 is refer to, another power supply type detection circuit includes connecting the USB interface and power management electricity The first switch circuit of road input and the second switch for being connected to DC charging inlets and the electric power management circuit input Circuit, the output end of first switch circuit is in parallel with second switch circuit output end, and first switch circuit is in second switch electricity Road is closed when turning on.The first switch circuit is metal-oxide-semiconductor, and the second switch circuit is reverse-filling diode.

Figure 11 is refer to, another power supply type detection circuit includes connecting the USB interface and power management electricity The first switch circuit of road input and the second switch for being connected to DC charging inlets and the electric power management circuit input Circuit.The power supply type detection circuit of the present embodiment is using a fixed resistance R50, a configuration resistance R60 and two switches Circuit Q1, Q2 are formed by connecting.According to charging priority other sets requirement of the electronic product to two kinds of charge modes of DC and USB, First via charging inlet DC connections charging priorities not low charge power supply all the way, the charging for example exported by adapter are set Power supply is to DC interfaces;Second road charging inlet USB connections charging priority not high charge power supply all the way, such as main equipment are set The USB charge power supplies accessed by USB data line.Charging inlet DC is connected to second switch circuit Q1 control end, or Second switch circuit Q1 control end is connected to via resistance R70, R80 bleeder circuit constituted, is docked using resistance R70, R80 Enter to the charge power supply on charging inlet DC and carry out after partial pressure, transmit to second switch circuit Q1 control end, control second is opened Powered-down road Q1 turns on its switch ways.Switch ways one end of the second switch circuit Q1 is grounded, the other end is by configuring The input of resistance R60 connection electric power management circuits, configuration resistance R60 output end is also grounded by fixed resistance R50.By Two road charging inlet USB are connected to first switch circuit Q2 control end, and the control end can also be further by pulling down electricity R90 ground connection is hindered, first switch circuit Q2 switch ways one end is grounded, the other end is connected to second switch circuit Q1 control End.That is the output end of first switch circuit Q2 connects the input of the second switch circuit Q1.

As described on-off circuit Q1, Q2 a kind of preferred circuit design method, can from metal-oxide-semiconductor, triode or The switch elements such as controllable silicon carry out the specific design of circuit.The present embodiment is with using the N-channel MOS pipe design on-off circuit It is specifically described exemplified by Q1, Q2.

Metal-oxide-semiconductor Q2 grid is connected to charging inlet USB, and is grounded by pull down resistor R90, by metal-oxide-semiconductor Q2 source Pole is grounded, drain electrode connection metal-oxide-semiconductor Q1 grid, and is connected to charging inlet DC by divider resistance R70 respectively, passes through partial pressure electricity Hinder R80 ground connection.By metal-oxide-semiconductor Q1 source ground, drain electrode is connected to the input of electric power management circuit by configuring resistance R60.

When there is charge power supply access on charging inlet DC, and on charging inlet USB during no charge power supply access, metal-oxide-semiconductor Q1 saturation conductions, metal-oxide-semiconductor Q2 is held off, and the resistance for being now linked into the equivalent resistance of electric power management circuit is equal to fixation Resistance R50 and the resistance in parallel for configuring resistance R60, it is that charging inlet has charge power supply that thus electric power management circuit, which can be identified, Access.

When no charge power supply access on charging inlet DC, and when having charge power supply access on charging inlet USB, metal-oxide-semiconductor Q2 saturation conductions, drag down metal-oxide-semiconductor Q1 grid potential, are held off metal-oxide-semiconductor Q1.Now, it is linked into power management electricity The resistance of the equivalent resistance of road input is equal to fixed resistance R50 resistance, it is possible thereby to judge that USB interface has charge power supply to connect Enter.

When having charge power supply access simultaneously on charging inlet DC and USB, due to metal-oxide-semiconductor Q1 saturation conductions, therefore metal-oxide-semiconductor Q2 is held off, and electric power management circuit prioritizing selection DC charge modes charge to the battery in electronic product.

Certainly, for the specific design mode of on-off circuit in above-mentioned the first and second resistance configuration circuit, equally Using switch elements such as triode, metal-oxide-semiconductor or controllable silicons the circuit connecting mode shown in Fig. 4 can be copied specifically to be set Meter, the present embodiment is not limited in above citing.

DC interfaces and USB interface can be combined into one on interface structure simultaneously, realize compatibility, i.e., Fig. 7 is into Figure 11 Two kinds of interfaces represent different connecting terminals, the connection to trigger the charging circuits different with USB of DC internally.

Further, because the charging current of DC chargings is larger, even if so operating current detects the work of electric circuit inspection When electric current is larger, it would however also be possible to employ larger charging current is charged, does not interfere with the normal of electronic product and use.While by In the presence of electric power management circuit or the functional circuit for treating MCU, the present embodiment can detect the high current of outside access When seat fills, priority setting is further made, when outside seat, which fills, to be detected, it, which is accessed, is detected as high priority, work electricity The output result priority of stream detection unit is set low to, and is preferentially charged with big charging current to battery.Now, if electric Power management circuits are with " soft charger " functions or functional circuit have MCU, and electric power management circuit or MCU can be direct Testing result is inputted with reference to DC and charging current adjusts the input of circuit, it is preferential that big charging current is exported according to DC testing results To battery.If electric power management circuit does not have software function, functional circuit also without MCU, now may be referred to Figure 12, in charging Priority circuit is directly extended in current regulating circuit, the prioritizing selection of DC chargings is realized, for example, adjusts circuit in charging current One OR circuit of middle increase, two input receives result (high level " 1 " the expression DC chargings, low level of DC charging detections " 0 " represents USB chargings) and operating current detection circuit testing result (high level " 1 " represents to need big current state of charge, Low level " 0 " represents low current charge state), the input condition of OR gate output end is as shown in the table:

V_DC CHC_SET OR gate is exported 0 0 0 0 1 1 1 0 1 1 1 0

Directly charged the battery it is possible thereby to realize under DC charge modes with big charging current.

The charging system of the present embodiment goes for the electronics production with two kinds of charging inlets compared to embodiment one Product, have more preferable usage experience than the charging circuit of embodiment one.

Embodiment three

Figure 13 is refer to, the charging system of the present embodiment and the difference of embodiment one and embodiment two are, the present embodiment The functional circuit MCU or trigger that do not carry, therefore the output end of operating current detection circuit 14 is directly connected to charging Current regulating circuit 15, to control charging current to adjust circuit regulation charging current, can equally be used when user is in charging When adjustment charging current so that electronic product be in high current working condition under when filled with smaller current to battery Electricity, with high current quick charge when under low current working condition, fully improves charge efficiency.

The charging system of the present embodiment can also the expanded function of reference implementation example two, with compatible DC charging and DC charge.Often The physical circuit of individual part may be referred to the physical circuit design of embodiment one and embodiment two, and the scope of application is wider.

Obviously, those skilled in the art can carry out the spirit of various changes and modification without departing from the present invention to invention And scope.So, if these modifications and variations of the present invention belong to the claims in the present invention and its equivalent technologies scope it Interior, then the present invention is also intended to comprising including these changes and modification.

Claims (2)

1. a kind of charging system of electronic product, for the built-in power charging for electronic product, the charging system includes USB The electric power management circuit and functional circuit of interface and the connection USB interface, the electric power management circuit can be connect by USB Mouth obtains external power to be charged for the built-in power, and the functional circuit is to consume the built-in power electric power to realize electricity The circuit of sub- product function, it is characterised in that the charging system also includes operating current and detects circuit and charging current regulation Circuit, the operating current detection circuit connects the functional circuit and detects the operating current of the functional circuit, described to fill Electric current regulating circuit includes the multiple regulation branch roads for connecting the electric power management circuit, can detect circuit according to operating current The regulation branch road that detection selection is connected manages the charging current that circuit is conveyed to built-in power with regulation power supply, in the charging electricity Configuration resistance, all the way fixed resistance and a path switching circuit all the way is provided with stream regulation circuit, wherein the electricity fixed all the way Hinder for a resistance branch, configure resistance all the way and a path switching circuit constitutes another resistance branch;The on-off circuit Control end is controlled by the result of the detection operating current, and switch ways one end ground connection of on-off circuit, the other end is connected through Configure resistance connection output charging current and pin is set;
The electric power management circuit is charging management chip, and the charging current output pin connection of the charging management chip is described Built-in power, output charging current sets pin to connect described charging current regulation circuit;The charging current adjusts circuit Regulation branch road be mainly made up of resistance branch, can it is of different sizes according to the operating current that detects and change be switched to it is described defeated The resistance branch gone out on charging current setting pin;
Operating current detection circuit is two-way comparison circuit, including all the way sampled voltage circuit, with two output ends Reference voltage circuit and two voltage comparators;The input of the sampled voltage circuit connects the electric current of the functional circuit Input, the output end of the sampled voltage circuit are connected to the positive input and another voltage of a voltage comparator The reverse input end of comparator;The reference voltage circuit and the sampled voltage circuit in parallel, an output end are connected to institute The reverse input end of a voltage comparator is stated, another output end is connected to the positive input of another voltage comparator End;The output end of two voltage comparators connects the functional circuit or charging current regulation circuit.
2. charging system as claimed in claim 1, it is characterised in that the functional circuit includes can be according to work electricity The output result of current detection circuit carries out the trigger of low and high level triggering.
CN201410300687.0A 2014-06-28 2014-06-28 A kind of charging system of electronic product CN104065125B (en)

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CN104578277B (en) * 2014-12-24 2016-03-23 广东欧珀移动通信有限公司 For the method for charging for electronic equipment and electronic equipment
CN104578301A (en) * 2015-01-09 2015-04-29 宇龙计算机通信科技(深圳)有限公司 Intelligent wearable device
CN105811035B (en) * 2016-04-27 2019-01-29 Tcl移动通信科技(宁波)有限公司 A kind of mobile terminal is filled with the adjusting method and system of battery current
CN107884660B (en) * 2017-10-17 2020-08-11 天津航空机电有限公司 Differential signal acquisition and fault detection circuit for aviation alternating current-direct current power distribution system

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KR100481505B1 (en) * 2003-01-02 2005-04-07 삼성전자주식회사 Digital device capable of battery charging and method thereof
US7548041B2 (en) * 2004-12-30 2009-06-16 Linear Technology Corporation Power management circuit and methodology for battery-powered systems
CN100355180C (en) * 2005-04-26 2007-12-12 华为技术有限公司 Method and device for reducing electric source power of terminal apparatus
CN201146393Y (en) * 2007-12-14 2008-11-05 比亚迪股份有限公司 Automatic recognition circuit for charging power supply
CN204068306U (en) * 2014-06-28 2014-12-31 青岛歌尔声学科技有限公司 A kind of charging system of electronic product

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