CN106655316A - Charging circuit and terminal equipment - Google Patents

Charging circuit and terminal equipment Download PDF

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Publication number
CN106655316A
CN106655316A CN201610840043.XA CN201610840043A CN106655316A CN 106655316 A CN106655316 A CN 106655316A CN 201610840043 A CN201610840043 A CN 201610840043A CN 106655316 A CN106655316 A CN 106655316A
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switch
pins
charging circuit
power
charging
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CN201610840043.XA
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CN106655316B (en
Inventor
张哲�
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Qiku Internet Technology Shenzhen Co Ltd
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Qiku Internet Technology Shenzhen Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

The invention discloses a charging circuit and terminal equipment. The charging circuit comprises two signal pins, two power supply pins, a USB controller and a power supply module; and the two power supply pins are connected with the power supply module electrically. In addition, the charging circuit also includes a first switch; and the two signal pins are switched between a mutual short circuit state and a state of electrical connection with the USB controller by the first switch. According to the charging circuit, because the first switch is arranged between the signal pins and the USB controller and thus the two signal pins are switched between the mutual short circuit state and the state of electrical connection with the USB controller by the first switch, switching of USB interfaces between an SDP type and a DCP type can be realized; and when switching to a DCP type is realized, external charging is realized by using heavy currents, so that the charging speed can increase. Therefore, a technical problem of slow charging speed during external charging of terminal equipment can be solved.

Description

Charging circuit and terminal device
Technical field
The present invention relates to electronic technology field, especially relates to a kind of charging circuit and terminal device.
Background technology
USB (Universal Serial Bus, USB) is powered and its Serial Communication Function for portable equipment Equally, a kind of standard application is had become.Nowadays, USB powers and has spread over battery charging, AC adapter and other power supplies The application of form.Using a significant effect bringing of popularization be that the charging and power supply of portable equipment can exchange plug and suitable Orchestration.All compared using the framework of private adapter accordingly, with respect to past every kind of device, current solution allows to adopt Multiple power sources are charged.
By taking USB2.0 as an example, 5 pins (PIN) are had in USB2.0mini interfaces, including:
A pair of power pins:VBUS/GND
A pair of signal pins:D+/D-
One principal and subordinate recognizes pin:UID
Two USB interface devices are needed by supporting that the USB data line of OTG (On-The-Go) connects.This data wire is only The UID for having one end is effective, it is assumed that when UID live ends are connected with device A, indicates that device A is main frame;The corresponding other end Equipment B, be slave.When it is determined that after principal and subordinate, main frame meets the voltage signal of USB by VBUS (positive pole) outputs;Slave After by voltage of VBUS signal activation, you can carry out type detection to the interface of main frame according to USB related protocols (BC1.2).
The type of HPI mainly has 4 kinds (also having subdivision sometimes), i.e. " SDP/DCP/CDP/ other ".Wherein, SDP (Standard Downstream Port) is USB standard downlink port, is exactly " the usb data interface " generally said, and DCP (Dedicated Charging Port) is special charging port, is exactly " the standard charger interface " generally said.SDP interfaces Interior (such as PC USB interface), D+/D- connections are USB controllers, carry out data transmit-receive;And (i.e. standard charging in DCP interfaces Device), D+/D- is short circuit, is served only for identifying interface type.
Which type the Handshake Protocol that slave can be specified by BC1.2, the interface for detecting main frame belongs to.If main Machine is SDP equipment, then can only at most absorb 500mA electric currents according to USB slave.And if main frame is DCP equipment, slave is extremely It is allowed to less absorb 1.8A electric currents.
At present, the passage that mobile terminal (such as smart mobile phone) is exported using USB interface as power supply, data input mostly, Follow USB associated protocol specifications.As shown in figure 1, when mobile terminal is charged as OTG main frames to slave, mobile terminal First host identities are gone out by the single-ended UID signal identifications of USB data line, then by power management integrated circuit (Power Management IC, PMIC) 5V voltages are exported from VBUS to slave;Slave is received after VBUS signals, by detect D+/ D- states judging HPI type, because the D+/D- of mobile terminal is to be connected on USB controller to carry out data transmission , therefore SDP equipment can be determined as by slave, from the absorption electric current for limiting itself of chance active, according to most 500mA specifications Electric current is absorbed from VBUS.Even if that is, OTG main frames possess very strong load capacity, cannot also provide bigger charging electricity Stream.However, in the case where present battery capacity generally alreadys exceed 3000mAh, the current specification of 500mA charges and extremely delays Slowly, substantially without what practical value.
In sum, when existing terminal device externally charges, charging current is little, and charging rate is extremely slow.
The content of the invention
The main object of the present invention is a kind of charging circuit of offer and terminal device, it is intended to solves terminal device and externally charges When, charging current is little, the slow technical problem of charging rate.
To achieve these objectives, the present invention proposes a kind of charging circuit, including two signal pins, two power pins, USB control Device processed and a power module, two power pins are electrically connected with the power module, also including a first switch, described two Signal pins are by the way that the first switch is in mutual short circuit and is electrically connected with switching between described two states of USB controller.
Further, also including a second switch, at least one power pins are by described the in two power pins Two switches are electrically connected with the power module.
Further, also including second control module being electrically connected with the second switch, the second control mould Block is used to control the closure of the second switch and disconnect.
Further, the power pins include a VBUS pins, the second switch be series at the VBUS pins with Between the power module.
Further, the second switch is single-pole single-throw switch (SPST).
Further, also including first control module being electrically connected with the first switch, the first control mould Block is used to control the handover operation of the first switch.
Further, the first switch is double-point double-throw switch.
Further, two signal pins include positive pole pin and negative pin.
Further, the power module includes battery and the power management integrated circuit PMIC being electrically connected with each other, institute State PMIC to be electrically connected with two power pins.
The present invention proposes a kind of terminal device simultaneously, and the terminal device includes a charging circuit, the charging circuit bag Include two signal pins, two power pins, a USB controller, a power module and first switch, two power pins with it is described Power module is electrically connected with, and two signal pins are by the way that the first switch is in mutual short circuit and is electrically connected with the USB controls Switch between two states of device processed.
A kind of charging circuit that the embodiment of the present invention is provided, by arranging one between signal pins and USB controller First switch so that two signal pins can be by the way that first switch is in mutual short circuit and is electrically connected with two states of USB controller Between switch, realize USB interface and switch between SDP and DCP two types, when DCP types are switched to, then can be with big Current versus charge, and improve charging rate, solve charging rate slow technical problem when terminal device externally charges.Together When, when DCP types are switched to, it is connected because two signal pins are disconnected with USB controller, therefore be physically disconnected Usb data connects, and now provides only charge function, improves security.
Description of the drawings
Fig. 1 is the circuit connection diagram that mobile terminal is connected as main frame with slave in prior art;
Fig. 2 is the circuit connection diagram of the charging circuit of first embodiment of the invention;
Fig. 3 is the circuit connection diagram of the charging circuit of second embodiment of the invention;
Fig. 4 is the circuit connection diagram of the charging circuit of third embodiment of the invention;
Fig. 5 is the circuit connection diagram of the charging circuit of fourth embodiment of the invention;
Fig. 6 is connected as the circuit that main frame is connected with slave using the mobile terminal of the charging circuit of the embodiment of the present invention Schematic diagram.
The realization of the object of the invention, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Specific embodiment
It should be appreciated that specific embodiment described herein is not intended to limit the present invention only to explain the present invention.
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative " " used herein, " It is individual ", " described " and " being somebody's turn to do " may also comprise plural form.It is to be further understood that arranging used in the specification of the present invention Diction " including " refers to there is the feature, integer, element and/or component, but it is not excluded that existing or adding one or more Other features, integer, element, component and/or their group.It should be understood that when we claim element to be " connected " or " coupled " to During another element, it can be directly connected or coupled to other elements, or can also there is intermediary element.Additionally, making here " connection " or " coupling " can include wireless connection or wireless coupling.Wording "and/or" used herein include one or More associated wholes or any cell for listing item and all combination.
Those skilled in the art of the present technique are appreciated that unless otherwise defined all terms used herein are (including technology art Language and scientific terminology), with art of the present invention in those of ordinary skill general understanding identical meaning.Should also It is understood by, those terms defined in such as general dictionary, it should be understood that with the context with prior art The consistent meaning of meaning, and unless by specific definitions as here, will not otherwise use idealization or excessively formal implication To explain.
Those skilled in the art of the present technique are appreciated that " terminal " used herein above, " terminal device " had both included wireless communication The equipment of number receiver, it only possesses the equipment of the wireless signal receiver of non-emissive ability, and including receiving and launch hardware Equipment, its have can on bidirectional communication link, perform two-way communication reception and transmitting hardware equipment.This equipment Can include:Honeycomb or other communication equipments, it has single line display or multi-line display or shows without multi-line The honeycomb of device or other communication equipments;PCS (Personal Communications Service, PCS Personal Communications System), it can With combine voice, data processing, fax and/or its communication ability;PDA (Personal Digital Assistant, it is personal Digital assistants), it can include radio frequency receiver, pager, the Internet/intranet access, web browser, notepad, day Go through and/or GPS (Global Positioning System, global positioning system) receiver;Conventional laptop and/or palm Type computer or other equipment, its have and/or conventional laptop and/or palmtop computer including radio frequency receiver or its His equipment." terminal " used herein above, " terminal device " they can be portable, can transport, installed in the vehicles (aviation, Sea-freight and/or land) in, or be suitable for and/or be configured in local runtime, and/or with distribution form, operate in the earth And/or any other position operation in space." terminal " used herein above, " terminal device " can also be communication terminal, on Network termination, music/video playback terminal, for example, can be PDA, MID (Mobile Internet Device, mobile Internet Equipment) and/or the equipment such as mobile phone, or intelligent television, Set Top Box with music/video playing function.
Embodiment one
With reference to Fig. 2, propose the charging circuit of first embodiment of the invention, the charging circuit include two signal pins, two Power pins, a USB controller, a power module and first switch S1.Two power pins are electrically connected with power module, Two signal pins are by the way that first switch S1 is in mutual short circuit and is electrically connected with switching between two states of USB controller.
In the embodiment of the present invention, two signal pins for USB interface a pair of differential signal pins, including positive pole pin (D+) With negative pin (D-).In other embodiments, or other kinds of signal pins, here is not limited.
In the embodiment of the present invention, two power pins are the positive pole pin (VBUS) and negative pole (ground connection) pin of USB interface (GND).In other embodiments, or other kinds of power pins, here is not limited.
In the embodiment of the present invention, power module includes PMIC and battery, battery and PMIC electric connections, PMIC and two power supplys Pin is electrically connected with.Alternatively, power module can also increase other electronic components on the basis of the present embodiment, or utilize Other electronic components replace PMIC.Alternatively, power module can also only include battery.
In the embodiment of the present invention, first switch S1 can switch between two positions.When first switch S1 is switched to position 1 When, two signal pins are electrically connected with USB controller, and now USB interface is SDP type, externally export small current (as at most 500mA), it is mainly used in transmission data.When first switch S1 is switched to position 2, the mutual short circuit of two signal pins, now USB Interface is modeled as DCP types, externally exports high current (such as at least 1.8A), is mainly used in externally charging.Alternatively, default conditions Under, first switch S1 is located at position 1, is connected with USB controller, i.e., USB interface is defaulted as SDP type.So as to pass through switching One switch S1, realizes USB interface and switches between SDP and DCP two types.
Alternatively, first switch S1 is double-point double-throw switch, or, or two single-pole single-throw switch (SPST)s, certainly, Can be other kinds of switch, here is not limited.
The charging circuit of the embodiment of the present invention, by arranging first switch S1 between signal pins and USB controller, Allow two signal pins to pass through first switch S1 to cut between mutual short circuit and electric connection two states of USB controller Change, realize USB interface and switch between SDP and DCP two types, when DCP types are switched to, then can be with high current pair Outer charging, improves charging rate, solves charging rate slow technical problem when terminal device externally charges.Meanwhile, when When being switched to DCP types, it is connected because two signal pins are disconnected with USB controller, therefore is physically disconnected usb data Connection, now provides only charge function, improves security.
Embodiment two
With reference to Fig. 3, the charging circuit of second embodiment of the invention is proposed, the present embodiment increases on the basis of first embodiment One first control module is added, the first control module is electrically connected with first switch S1, for controlling the switching of first switch S1 Operation.Alternatively, the first control module can also be integrated in the other electron component of terminal device.
In first embodiment, user's manual switching first switch S1 is needed, in the present embodiment, the first control module is being received To during switching command or judge meet switching condition when, automatic switchover first switch S1.So as to improve intelligent level, carry Consumer's Experience is risen.
Embodiment three
With reference to Fig. 4, the charging circuit of third embodiment of the invention is proposed, the present embodiment increases on the basis of first embodiment A second switch S2 is added, at least one power pins are electrically connected with power module by second switch S2 in two power pins.
In the embodiment of the present invention, second switch S2 be series at the positive pole pin (such as VBUS) of power pins and power module it Between, i.e., the positive pole pin of power pins is electrically connected with power module by second switch S2.Alternatively it is also possible to be power pins Negative pin power module is electrically connected with by second switch S2, or, two power pins are electric by second switch S2 Property connection power module.
In aforementioned first and second embodiment, after USB data line is plugged, in charging process, need to carry out USB interface class When type switches, need to plug USB data line again, because only that disconnect USB data line and plug again after USB data line, from Machine just can be reactivated by the voltage of power pins, and start the testing process of the interface type to main frame, then according to detection Types of absorbent dimension electric current.
In the present embodiment, when needing to carry out usb type switching, second switch S2 is first disconnected, now from machine testing To power pins invalidating signal, then stop absorbing electric current;Then switch first switch S1 (such as from position 1 be switched to position 2 or Position 1 is switched to from position 2), to realize that the switching of usb type (is switched to DCP types or from DCP classes from SDP type Type is switched to SDP type);Second switch S2 is finally closed again, now slave is reactivated by the voltage of power pins, is detected Power pins signal effectively, starts the type that new testing process detects host USB interface, corresponding according to the types of absorbent of detection The electric current of specification.Alternatively, second switch S2 acquiescences are in closure state.
So as to when the switching of usb type is carried out in charging process, without the need for plugging data wire again, only need to disconnect Second switch S2 is simultaneously re-closed, and eliminates the loaded down with trivial details flow process that user plugs USB data line again so that switching is more square Just it is quick.
Example IV
With reference to Fig. 5, the charging circuit of fourth embodiment of the invention is proposed, the present embodiment increases on the basis of 3rd embodiment The first control module and the second control module are added.First control module is electrically connected with first switch S1, for control first The handover operation of switch S1, the second control module and second switch S2 are electrically connected with, for control the closure of second switch S2 with Disconnect.Alternatively, the first control module and/or the second control module can also be integrated in the other electron component of terminal device.
In 3rd embodiment, user's manual switching first switch S1 and second switch S2 are needed.In the present embodiment, the second control When switching command is received or when judging to meet switching condition, automatic switchover first switch S1 disconnects or closes molding block Close second switch S2;First control module is when switching command is received or judges when meeting switching condition, automatically switches the One switch S1.So as to improve intelligent level, Consumer's Experience is improved.
The charging circuit of the embodiment of the present invention, is mainly used in terminal device, the particularly terminal with USB interface and sets It is standby.The terminal device can be the meter such as the mobile terminals such as mobile phone, flat board, or PC (PC), notebook computer Calculation machine terminal, can also be other electronic equipments.
As shown in fig. 6, the charging circuit for the embodiment of the present invention is applied to an example of mobile terminal, it is mobile whole in Fig. 6 End is connected as OTG main frames with slave.Main frame has a USB interface, and USB interface includes a pair of power pins VBUS and GND, and one To signal pins D+ and D-, the USB interface is connected by USB data line with slave.Main frame also includes that first switch S1, second open Close S2, USB controller, PMIC, battery and central processing unit (Central Processing Unit, CPU), USB controller with CPU is electrically connected with, and PMIC is electrically connected with respectively with battery and CPU.VBUS pins are electrically connected with by second switch S2 and PMIC, Signal pins D+ and D- connection first switches S1, first switch S1 can switch between position 1 and position 2.Common, first opens Close S1 and be in position 1 by default so that signal pins D+ and D- are electrically connected with USB controller by first switch S1, Simultaneously second switch S2 is closed by default, that is to say, that main frame is by default SDP equipment;Work as first switch When S1 is in position 2, signal pins D+ and D- will be caused in rear end short circuit, now main frame is DCP equipment.Wherein, CPU can be replaced For aforementioned first control module and the second control module function (such as by the first control module and the second control module is integrated arrives In CPU), the switching to first switch S1 and second switch S2 is controlled.
When mobile terminal is charged as OTG main frames to slave, mobile terminal is single-ended by USB data line first UID signal identifications go out host identities, then 5V voltages are exported from VBUS to slave by PMIC;Slave receives VBUS signals Afterwards, HPI type is judged by detecting D+/D- states.When first switch S1 connects USB controller in position 1, Slave identification main frame is SDP equipment, is charged with small current (such as 500mA), and keeps usb data to connect;Work as first switch S1 causes signal pins D+ and D- in rear end short circuit in position 2, and slave identification main frame is DCP equipment, with high current (such as 1.8A) it is charged.
Assume current just with low current charge, when main frame receives switching command, second switch S2 is disconnected first, now Slave detects VBUS invalidating signals, then stop absorbing electric current, and terminates usb data connection;Then mian engine changeover first switch S1 so that D+/D- is in short circuit state, and USB interface is modeled as into DCP types;Last main frame closure second switch S2 is (if any must Will, PMIC can in advance improve power output, it is to avoid cannot load bigger electric current), now slave detects VBUS signals and has Effect, starts new testing process, and the interface for detecting main frame is after DCP types, to be then charged with high current.
Assume current just with large current charge, when main frame receives switching command, second switch S2 is disconnected first, now Slave detects VBUS invalidating signals, stops absorbing electric current;Then mian engine changeover first switch S1 so that D+/D- and USB is controlled Device connects, and is modeled as SDP type;Last main frame closes second switch S2, and now slave detects VBUS signals effectively, starts new Testing process, the interface for detecting main frame is SDP type, then be charged with small current, and keep usb data to connect.
After the charging circuit of the embodiment of the present invention, mobile terminal can be modeled as DCP types so that with mobile terminal The slave of connection can absorb high current and be charged, and when solving terminal device and externally charging, charging current is little, charging rate Extremely slow technical problem, greatly improves the charging rate of external charging.It is mobile when external transmission data is only needed Terminal can switch back into SDP type again so that mobile terminal can flexibly be cut as needed between SDP type and DCP types Change, meet the various functions of mobile terminal, improve Consumer's Experience.Meanwhile, when DCP types are switched to, due to two signals Pin is disconnected and is connected with USB controller, therefore is physically disconnected the usb data connection of mobile terminal, now provides only Charge function, improves security.
The present invention proposes a kind of terminal device simultaneously, and the terminal device can be the mobile terminals such as mobile phone, flat board, also may be used To be the terminals such as PC (PC), notebook computer, other electronic equipments are can also be.The terminal device includes One charging circuit, the charging circuit includes two signal pins, two power pins, a USB controller, a power module and first Switch, two power pins are electrically connected with the power module, and two signal pins are by the first switch in phase Mutually switch between short circuit and described two states of USB controller of electric connection.Charging circuit described in the present embodiment is this Charging circuit in invention involved by above-described embodiment, will not be described here.
The terminal device of the embodiment of the present invention, by arranging first switch S1 between signal pins and USB controller, Allow two signal pins to pass through first switch S1 to cut between mutual short circuit and electric connection two states of USB controller Change, realize USB interface and switch between SDP and DCP two types, when DCP types are switched to, be connected with terminal device Slave can then absorb high current and be charged, and when solving terminal device and externally charging, charging current is little, and charging rate is extremely Slow technical problem, greatly improves the charging rate of external charging.When external transmission data is only needed, terminal device SDP type can be switched back into again so that terminal device can flexibly switch as needed between SDP type and DCP types, it is full The foot various functions of mobile terminal, improve Consumer's Experience.
Meanwhile, when DCP types are switched to, it is connected because two signal pins are disconnected with USB controller, therefore physics On be disconnected terminal device usb data connection, now provide only charge function, improve security.
Above by reference to the preferred embodiments of the present invention have been illustrated, not thereby limit to the interest field of the present invention.This Art personnel can have various flexible programs to realize the present invention, for example as one without departing from the scope of the present invention and essence The feature of individual embodiment can be used for another embodiment and obtain another embodiment.All institutes within the technology design with the present invention Any modification, equivalent and the improvement made, all should be within the interest field of the present invention.

Claims (10)

1. a kind of charging circuit, including two signal pins, two power pins, a USB controller and a power module, described two is electric Source pin is electrically connected with the power module, it is characterised in that also including a first switch, and two signal pins pass through institute First switch is stated in mutual short circuit and switching between described two states of USB controller is electrically connected with.
2. charging circuit according to claim 1, it is characterised in that also including a second switch, two power pins In at least one power pins the power module is electrically connected with by the second switch.
3. charging circuit according to claim 2, it is characterised in that be also electrically connected with the second switch including Second control module, second control module is used to control the closure of the second switch and disconnect.
4. charging circuit according to claim 2, it is characterised in that the power pins include a VBUS pins, described Second switch is series between the VBUS pins and the power module.
5. charging circuit according to claim 4, it is characterised in that the second switch is single-pole single-throw switch (SPST).
6. the charging circuit according to any one of claim 1-5, it is characterised in that also including one with first switch electricity Property connection the first control module, first control module is used to control the handover operation of the first switch.
7. the charging circuit according to any one of claim 1-5, it is characterised in that the first switch is opened for DPDT Close.
8. the charging circuit according to any one of claim 1-5, it is characterised in that two signal pins are drawn including positive pole Pin and negative pin.
9. the charging circuit according to any one of claim 1-5, it is characterised in that the power module is included mutually electrically The battery and power management integrated circuit PMIC of connection, the PMIC is electrically connected with two power pins.
10. a kind of terminal device, it is characterised in that include the charging circuit as described in any one of claim 1-9.
CN201610840043.XA 2016-09-21 2016-09-21 Charging circuit and terminal device Active CN106655316B (en)

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CN107706977A (en) * 2017-10-16 2018-02-16 广东欧珀移动通信有限公司 The detection method and charging device of a kind of charging current
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