CN202798035U - Charging mode detection circuit and mobile terminal - Google Patents

Charging mode detection circuit and mobile terminal Download PDF

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Publication number
CN202798035U
CN202798035U CN 201220311557 CN201220311557U CN202798035U CN 202798035 U CN202798035 U CN 202798035U CN 201220311557 CN201220311557 CN 201220311557 CN 201220311557 U CN201220311557 U CN 201220311557U CN 202798035 U CN202798035 U CN 202798035U
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charging
interface
management module
data
power management
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CN 201220311557
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陈雷
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Hisense Mobile Communications Technology Co Ltd
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Hisense Mobile Communications Technology Co Ltd
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Abstract

The utility model discloses a charging mode detection circuit and a mobile terminal, which comprises a charger interface, a data/charging multiplex interface and a power supply management module. The power supply pin of the charger interface is connected with the charging current input terminal of the power supply management module. On one hand, the power supply pin of the data/charging multiplex interface is connected with the charging current input terminal of the power supply management module by means of a switching element conducted only when the data/charging multiplex interface is provided with a power input. On the other hand, the power supply pin of the data/charging multiplex interface is connected with the detection terminal of the power supply management module. Due to the adoption of the charging mode detection circuit, the signal input states of both the charging current input terminal and the detection terminal of the power supply management module are subjected to comprehensive detection to determine an appropriate absorption current, so that the charging process of a battery can be controlled. The charging mode detection circuit meets various charging requirements of batteries and ensures the safety of charging equipment.

Description

A kind of charging modes testing circuit and portable terminal
Technical field
The utility model belongs to the charging circuit technical field, specifically, relates to a kind of for USB device charging and charger charge two kinds of charging modes and the charging modes testing circuit that designs and the portable terminal that adopts described charging modes measurement circuit design.
Background technology
For the present portable terminal products such as mobile phone, much all with the USB charging inlet of standard, namely utilize a standard USB interface that arranges on the portable terminal product, compatibility is finished the charging of portable terminal and the dual role of data communication.The problem that this portable terminal product all needs to solve is: when the charger that utilizes USB device and standard charged to portable terminal, the inner set Absorption Current of portable terminal was inconsistent.According to the codes and standards of USB2.0, the maximum output current that the USB2.0 interface can externally provide is 500mA.And for the charger of standard, external exportable electric current is far longer than this value, is generally 700mA or 800mA, even some adopts the professional equipment of high capacity cell, and the output current of the charger that it adopts also might be up to more than the 1000mA.Given this, need to distinguish two kinds of different charging modes in portable terminal inside, in order to take different Absorption Current processing policies.Otherwise, when adopting USB device that portable terminal is charged, if the portable terminal internal error taked Absorption Current processing policy greater than 500mA, then might be so that provide the USB device of charging current to damage because of short circuit.
At present, the direct method that is used for distinguishing USB device charging or charger charging is to adopt 4 line formula USB standard charging devices as annex, and by the difference signal terminal D+ in the USB interface, D-short circuit are distinguished two kinds of charging modes.That is, if portable terminal detects difference signal terminal D+, D-short circuit in the USB interface, then judge it is the charger charging, it is large electric current that Absorption Current is set; If difference signal terminal D+, D-that portable terminal detects in the USB interface disconnect, then judge it is the USB device charging, it is little electric current that Absorption Current is set.
Obviously, this traditional charging modes detection method is only applicable to adopt the charger of USB interface, and for the portable terminal that some special industry adopts, often needing to dispose the special charger equipment of non-USB interface, existing like this method for measuring charged is obviously just inapplicable.
Summary of the invention
The purpose of this utility model is to provide a kind of charging modes testing circuit, is the charging that USB device charging or the special charger that adopts non-USB interface carry out to distinguish exactly the current charging modes that is adopted.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of charging modes testing circuit comprises a charger interface, data/charging multiplex interface and a power management module; The power pins of described charger interface connects the charging current input terminal of power management module; The power pins of described data/charging multiplex interface on the one hand by one only when data/charging multiplex interface has power supply to input the switch element of conducting connect the charging current input terminal of described power management module, connect on the other hand the detection terminal of described power management module.
Preferably, described switch element preferably adopts a diode to carry out circuit design, the power pins of the anodic bonding data of described diode/charging multiplex interface, and the negative electrode of diode connects the charging current input terminal of described power management module.
Certainly, described switch element also can adopt a metal-oxide-semiconductor to carry out circuit design, specifically can select a N-channel MOS pipe, the power pins that the grid of described metal-oxide-semiconductor is connected described data/charging multiplex interface by current-limiting resistance, drain electrode connects the power pins of described data/charging multiplex interface, and source electrode connects the charging current input terminal of described power management module.
Further, the charging current lead-out terminal of described power management module connects battery, and output current is the battery charging.
For the interface resource of conserver power source administration module, preferably adopt the overvoltage protection terminal of power management module as described detection terminal, the power pins of connection data/charging multiplex interface.
Detection terminal for the protection power source administration module; the detection terminal that preferably power pins of described data/charging multiplex interface is connected described power management module by current-limiting resistance; flow into the electric current of detection terminal with restriction, avoid the interface of power management module is caused damage.
Preferably, be connected with filter regulator circuit in the power pins of described data/charging multiplex interface, with stable power supply by data/charging multiplex interface introducing.
Further, described charger interface is the special charger interface of non-USB interface, for example circular interface; Described data/charging multiplex interface is USB interface.
Preferably, the damage that the interiors of products circuit board is caused in order to suppress electrostatic impact in described USB interface, is preferably passed through one tunnel piezo-resistance ground connection with its differential signal pin, separately to realize releasing fast of surge current.
Based on the structural design of above-mentioned charging modes testing circuit, the utility model also provides a kind of portable terminal that adopts described charging modes measurement circuit design, comprises battery, a charger interface, data/charging multiplex interface and a power management module; The power pins of described charger interface connects the charging current input terminal of power management module; The power pins of described data/charging multiplex interface on the one hand by one only when data/charging multiplex interface has power supply to input the switch element of conducting connect the charging current input terminal of described power management module, connect on the other hand the detection terminal of described power management module.By power management module the signal input state of its charging current input terminal and detection terminal is carried out comprehensive detection, to realize the accurate identification to two kinds of charge modes.
Compared with prior art, advantage of the present utility model and good effect are: charging modes testing circuit of the present utility model is simple in structure, be easy to realize, by cooperating simple software flow that the charging current input terminal of power management module and the signal input state of detection terminal are carried out comprehensive detection, thereby can distinguish easily and accurately two kinds of different charge modes, and then determine the charging process of suitable Absorption Current control battery.Not only satisfied thus the multiple charging requirement of battery; and can effectively avoid when adopting data equipment to be used for to charge into portable terminal; the generation of the problems such as the data equipment damage that may cause; when conscientiously guaranteeing charging of mobile devices safety, realized the effective protection to outside data equipment.
After reading by reference to the accompanying drawings the detailed description of the utility model execution mode, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the circuit theory diagrams of a kind of embodiment of the charging modes testing circuit that proposes of the utility model;
Fig. 2 is the circuit theory diagrams of another embodiment of the charging modes testing circuit that proposes of the utility model.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
Present embodiment (is data/charging multiplex interface for the multiplex interface that is provided with charger interface independently at the portable terminal product and independently can be used for charging and transfer of data, be designated hereinafter simply as multiplex interface) situation, a kind of testing circuit that can accurately distinguish two kinds of charging modes has been proposed.This charging modes testing circuit utilizes the power management module of portable terminal inside to receive respectively charge power supply from the input of charger interface or multiplex interface, and in the situation that the charge power supply input is arranged, whether further judge on the power pins of multiplex interface has power supply to access, if the power supply access is arranged, then be judged to be by multiplex interface and charge, and be arranged to the low current charge pattern, such as Absorption Current being set less than 500mA, to protect outside data equipment; If the non-transformer access then is judged to be the charger charging, and is arranged to the large current charge pattern, such as Absorption Current being set greater than 700mA, to realize the quick charge to battery.
In order to realize above-mentioned charging modes testing process, present embodiment is at first on circuit structure design, the charging current input terminal of power management module is connected the corresponding connection of power pins with charger interface respectively with multiplex interface, and set up a switch element in the charge power supply transmission line between the charging current input terminal of the power pins of multiplex interface and power management module, power pins with multiplex interface is connected on one road detection terminal of described power management module simultaneously, the only conducting when multiplex interface has the power supply access of described switch element is set, flow into mistakenly in this road detection terminal of described power management module by the power supply of charger input avoiding, cause the erroneous judgement of charging modes.Secondly, the level state that increases in the software program of power management module its charging current input terminal and detection terminal detects the process of judging with charging modes.For example: when the charging current input terminal has the voltage input, produce an interrupt signal, control system enters the deterministic process of charging modes.In this process, the detection terminal of power management module is detected, if the voltage input is arranged on the detection terminal, then be judged to be by multiplex interface and charge; If there is not the voltage input on the detection terminal, then be judged to be the charger charging.
In order to be described clearly for simplicity, present embodiment following take USB interface as described multiplex interface as example, by two specific embodiments, concrete assembling structure and the operation principle of described charging modes testing circuit is explained in detail.
Embodiment one, and the switch element of present embodiment describes as an example of a diode D7003 who supports large electric current example, referring to shown in Figure 1.
Among Fig. 1, CN7001 is charger interface, is used for the special-purpose charger device of pegging graft, and for example can select circular non-standard charger interface, perhaps the special charger interface of other non-USB interface forms.The power pins 2 of described charger interface CN7001 being connected on the charging current input terminal VCHG of power management module of portable terminal inside, with by power management module transmission charging current, is the battery charging of portable terminal.CN7002 is data/charging multiplex interface, describe as an example of USB interface example, the power pins Vbus of USB interface is connected to the anode of diode D7003, the negative electrode of diode D7003 is connected the charging current input terminal VCHG of power management module, and the power pins Vbus of USB interface is connected on one road detection terminal MSM_OVP of power management module by current-limiting resistance R7024.
When the user adopts charger that portable terminal is charged, charger is plugged on the described charger interface CN7001, and the charging current by charger output transfers on the charging current input terminal VCHG of power management module by the power pins 2 of charger interface CN7001.Power management module has power supply when input detecting its charging current input terminal VCHG, then the level state of its detection terminal MSM_OVP is detected.The USB device because do not peg graft on the USB interface CN7002 this moment, therefore the level state of this detection terminal MSM_OVP is low, be 0V, thus, it is charger charging that power management module can determine current charging modes, and it is large electric current that Absorption Current is set, such as greater than 700mA, and then the output of the charging current lead-out terminal by power management module charging current, be the battery charging of portable terminal inside.
When the user adopts USB device that portable terminal is charged, USB device is plugged on the USB interface CN7002, at this moment, portable terminal is except can carrying out the data interaction with the USB device of outside, and can also utilize USB device is the battery charging of himself.Specifically, with in the USB device+the power pins Vbus of 5V DC power supply by USB interface CN7002 introduce, and controls diode D7003 forward conduction on the one hand, makes charging current flow into the charging current input terminal VCHG of power management module; Transfer on the other hand the detection terminal MSM_OVP of power management module by current-limiting resistance R7024.Power management module all has voltage when input detecting its charging current input terminal VCHG and detection terminal MSM_OVP, judge that current charging modes charges as USB device, and then Absorption Current is set is little electric current, such as 500mA, to avoid causing the USB device Damage by Short Circuit.The charging current lead-out terminal of power management module is connected battery, and the output charging current is the battery charging.
Consider a kind of special circumstances, namely the user adopts in the process that charger charges to portable terminal, simultaneously portable terminal is connected with outside USB device, carries out data communication.In the case, owing to by charger interface CN7001 and USB interface CN7002 the power supply input is arranged all, thereby the charging current input terminal VCHG of power management module and detection terminal MSM_OVP are high level, at this moment, power management module judges that current charging modes charges as USB device, and it is little electric current that Absorption Current is set.But, in this case, the charging current that is input to power management module obviously provides (because this moment, diode D7003 was in cut-off state) by charger, this kind charge mode is set as the USB device charging here, in order to limit Absorption Current, to avoid USB device is caused damage.
For fear of the too much interface resource that takies power management module; present embodiment preferably adopts the overvoltage protection terminal of power management module as described detection terminal MSM_OVP; when the power supply by USB interface CN7002 input was carried out overvoltage protection, the detection that is used for charging modes was judged.
For so that stable by the DC power supply of USB interface CN7002 input, present embodiment is preferably set up filter circuit of pressure-stabilizing at the power pins Vbus of USB interface CN7002, as shown in Figure 1, voltage-stabiliser tube D7005, filter capacitor C7005 and the resistance R 7006 of earth specifically can be set, with the ripple of making an uproar of the interference on the filter out power line.
In addition, on the detection terminal MSM_OVP of power management module, also can further connect voltage stabilizing circuit, as shown in Figure 1, voltage-stabiliser tube D7004 and resistance R 7032 such as earth, further to stablize the voltage among the detection terminal MSM_OVP that is input to power management module, improve the accuracy of testing result.
For fear of portable terminal with the external USB apparatus connecting time; introduce the damage that electrostatic interference causes the portable terminal internal circuit board; present embodiment preferably connects one tunnel piezo-resistance RV7003, RV7002 separately on differential signal pin USB_DN, the USB_DP of USB interface CN7002; by piezo-resistance RV7003, RV7002 with the surge voltage of the introducing ground of releasing, to play the purpose of protection portable terminal.
Embodiment two, and the switch element of present embodiment describes as an example of a metal-oxide-semiconductor Q7002 example, referring to shown in Figure 2.
Among Fig. 2, described metal-oxide-semiconductor Q7002 preferably adopts a N-channel MOS pipe to carry out circuit design.Be connected to the grid of metal-oxide-semiconductor Q7002 on the power pins Vbus of USB interface CN7002 by current-limiting resistance R7002, the drain electrode of metal-oxide-semiconductor Q7002 connects the power pins Vbus of USB interface CN7002, and source electrode connects the charging current input terminal VCHG of power management module.The connected mode of other devices is with reference to the associated description among the embodiment one, and present embodiment is not done repeat specification at this.
When the user adopts charger that portable terminal is charged, if do not insert USB device on the USB interface CN7002 this moment, then the detection terminal MSM_OVP of power management module is low level state, at this moment, power management module judges that current charge mode charges as charger, it is large electric current that Absorption Current is set, and the output charging current is the quickly charging battery of portable terminal inside.If there is this moment external USB equipment to insert on the USB interface CN7002, then can be checked through its detection terminal MSM_OVP be high level to power management module.At this moment, power management module is judged to be USB device charging with current charge mode, and Absorption Current is set is little electric current, to avoid that USB device is caused damage.Obviously; in this case; metal-oxide-semiconductor Q7002 is in cut-off state; therefore; for providing the equipment of charging current, power management module still is charger; why this charge mode being defined as the USB device charging, is in order to limit the size of Absorption Current, to play the purpose of protection USB device.
When the user adopts USB device that portable terminal is charged, USB device is plugged on the USB interface CN7002, power pins Vbus input by USB interface CN7002+the 5V DC power supply is applied to the grid of metal-oxide-semiconductor Q7002 by current-limiting resistance R7002, control metal-oxide-semiconductor Q7002 saturation conduction, and then drain electrode and the source electrode of general+5V DC power supply by the metal-oxide-semiconductor Q7002 charging current input terminal VCHG that transfers to power management module.Power management module has voltage when input detecting its charging current input terminal VCHG, then the level state of its detection terminal MSM_OVP is detected, since this moment by USB interface CN7002 input+the 5V DC power supply also has been input to the detection terminal MSM_OVP of power management module simultaneously, therefore, the detection terminal MSM_OVP of power management module also is high level.At this moment, power management module judges that current charging modes charges as USB device, and then Absorption Current is set is little electric current, and by its charging current lead-out terminal output charging current, is the battery charging.
Certainly, for the type selecting of described switch element, present embodiment is not limited in above giving an example, as long as can satisfy the only condition of conducting when USB interface has the power supply input, present embodiment does not specifically limit this.
Certainly, the charging modes testing circuit that present embodiment proposes also is not limited in the portable terminal product, is provided with on the electronic product of independently charger interface and data/charging multiplex interface applicablely equally at other, and present embodiment does not specifically limit this.
Should be noted that; the above only is a kind of preferred implementation of the present utility model; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.

Claims (10)

1. a charging modes testing circuit is characterized in that: comprise a charger interface, data/charging multiplex interface and a power management module; The power pins of described charger interface connects the charging current input terminal of power management module; The power pins of described data/charging multiplex interface on the one hand by one only when data/charging multiplex interface has power supply to input the switch element of conducting connect the charging current input terminal of described power management module, connect on the other hand the detection terminal of described power management module.
2. charging modes testing circuit according to claim 1, it is characterized in that: described switch element is a diode, the power pins of the anodic bonding data of described diode/charging multiplex interface, the negative electrode of diode connects the charging current input terminal of described power management module.
3. charging modes testing circuit according to claim 1, it is characterized in that: described switch element is a N-channel MOS pipe, the grid of described metal-oxide-semiconductor connects the power pins of described data/charging multiplex interface by current-limiting resistance, drain electrode connects the power pins of described data/charging multiplex interface, and source electrode connects the charging current input terminal of described power management module.
4. charging modes testing circuit according to claim 1 is characterized in that: the charging current lead-out terminal of described power management module connects battery, and output current is the battery charging.
5. each described charging modes testing circuit in 4 according to claim 1, it is characterized in that: the detection terminal of described power management module is the overvoltage protection terminal.
6. each described charging modes testing circuit in 4 according to claim 1, it is characterized in that: the power pins of described data/charging multiplex interface connects the detection terminal of described power management module by current-limiting resistance.
7. charging modes testing circuit according to claim 6, it is characterized in that: the power pins at described data/charging multiplex interface is connected with filter regulator circuit.
8. each described charging modes testing circuit in 4 according to claim 1, it is characterized in that: described charger interface is the special charger interface of non-USB interface; Described data/charging multiplex interface is USB interface.
9. charging modes testing circuit according to claim 8 is characterized in that: in described USB interface, its differential signal pin is separately by one tunnel piezo-resistance ground connection.
10. portable terminal is characterized in that: comprise battery and such as the described charging modes testing circuit of each claim in the claim 1 to 9.
CN 201220311557 2012-06-29 2012-06-29 Charging mode detection circuit and mobile terminal Active CN202798035U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103401284A (en) * 2013-07-26 2013-11-20 Tcl通讯(宁波)有限公司 Charging control device and mobile terminal
CN104330998B (en) * 2013-12-24 2017-06-27 广州三星通信技术研究有限公司 The portable terminal and its method of Auto Power On under overvoltage condition can be prevented
CN109861038A (en) * 2018-12-11 2019-06-07 苏州佳世达电通有限公司 It can automatically switch the USB Port and its control method of connection mode
CN114123434A (en) * 2022-01-27 2022-03-01 深圳市高端无人机有限公司 Power supply circuit and electronic device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103401284A (en) * 2013-07-26 2013-11-20 Tcl通讯(宁波)有限公司 Charging control device and mobile terminal
CN103401284B (en) * 2013-07-26 2015-10-28 Tcl通讯(宁波)有限公司 Battery charge controller and mobile terminal
CN104330998B (en) * 2013-12-24 2017-06-27 广州三星通信技术研究有限公司 The portable terminal and its method of Auto Power On under overvoltage condition can be prevented
CN109861038A (en) * 2018-12-11 2019-06-07 苏州佳世达电通有限公司 It can automatically switch the USB Port and its control method of connection mode
CN114123434A (en) * 2022-01-27 2022-03-01 深圳市高端无人机有限公司 Power supply circuit and electronic device
CN114123434B (en) * 2022-01-27 2022-04-15 深圳市高端无人机有限公司 Power supply circuit and electronic device

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