CN111049220A - Charging circuit, terminal equipment and charging system - Google Patents
Charging circuit, terminal equipment and charging system Download PDFInfo
- Publication number
- CN111049220A CN111049220A CN201911357087.7A CN201911357087A CN111049220A CN 111049220 A CN111049220 A CN 111049220A CN 201911357087 A CN201911357087 A CN 201911357087A CN 111049220 A CN111049220 A CN 111049220A
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- Prior art keywords
- charging
- circuit
- input end
- management chip
- switch circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
- H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of charging, and discloses a charging circuit, terminal equipment and a charging system. The charging circuit includes: the charging management system comprises a base charging interface, a USB charging interface, a detection circuit, a change-over switch circuit and a charging management chip; the first input end of the changeover switch circuit is connected with the base charging interface, the second input end of the changeover switch circuit is connected with the USB charging interface, and the output end of the changeover switch circuit is connected with the first input end of the charging management chip; the input end of the detection circuit is connected with the USB charging interface, and the output end of the detection circuit is connected with the second input end of the charging management chip; the output end of the charging management chip is connected with the rechargeable battery. The embodiment of the invention is based on the improvement of a non-standard charging mode, and the charging management chip can realize voltage detection through a simple detection circuit so as to carry out management control of quick charging, namely, a quick charging scheme with low cost and high efficiency is realized through simple circuit overlapping, and the charging time is greatly shortened.
Description
Technical Field
The invention relates to the technical field of charging, in particular to a charging circuit, terminal equipment and a charging system.
Background
With the development Of science and technology, terminal devices such as Point Of Sale (POS) devices or digital Assistant (PDA) devices become indispensable communication tools for people. At present, various terminal devices can support a USB charging mode, but based on the limitation of the current technical development, nonstandard charging can only reach 900mA at most, the charging speed is slow, and the charging efficiency is low, so that the charging and power supplying by utilizing a base seat becomes a charging compatible scheme for hot selection of customers.
However, the current dual charge implementation has the following drawbacks: in a non-standard charging environment, in order to realize quick charging, the terminal equipment is required to be provided with a voltage detection PIN besides two conventional PINs, and certain specific platforms cannot meet the requirement, so that a quick charging mode cannot be realized.
Disclosure of Invention
The invention aims to provide a charging circuit, a terminal device and a charging system, which solve the defect that some specific platforms cannot realize quick charging in a non-standard charging environment in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a charging circuit, comprising: the charging management system comprises a base charging interface, a USB charging interface, a detection circuit, a change-over switch circuit and a charging management chip;
the first input end of the change-over switch circuit is connected with the base charging interface, the second input end of the change-over switch circuit is connected with the USB charging interface, and the output end of the change-over switch circuit is connected with the first input end of the charging management chip;
the input end of the detection circuit is connected with the USB charging interface, and the output end of the detection circuit is connected with the second input end of the charging management chip;
the output end of the charging management chip is connected with a rechargeable battery;
the detection circuit is used for detecting the voltage value of the USB charging interface, and when the voltage value of the USB charging interface is higher than a first specified threshold value, the voltage value of the second input end of the charging management chip is pulled up;
the change-over switch circuit is used for controlling the conduction of the first input end and the output end of the change-over switch circuit when detecting that the voltage of the first input end of the change-over switch circuit is higher than a second specified threshold value, otherwise, controlling the conduction of the second input end and the output end of the change-over switch circuit;
the charging management chip is used for executing a special charging port DCP quick charging process on the rechargeable battery when the voltage value of the second input end of the charging management chip is higher than a third specified threshold value, otherwise executing a USB charging process on the rechargeable battery.
Optionally, the detection circuit includes a diode and a pull-up resistor;
the anode of the diode is connected with the USB charging interface, the cathode of the diode is connected with one end of the pull-up resistor, and the other end of the pull-up resistor is connected with the second input end of the charging management chip.
Optionally, the first input end of the switch circuit is connected with the base charging interface through a boost circuit; the boost circuit is used for adjusting the input voltage of the boost circuit to an output voltage higher than the preset value of the input voltage.
Optionally, an enable input end of the boost circuit is connected with the base charging interface, an output end of the boost circuit is connected with a first input end of the change-over switch circuit, and an output end of the boost circuit is grounded through a first voltage dividing resistor and a second voltage dividing resistor which are connected in series.
A terminal device comprising a charging circuit as described above.
Optionally, the detection circuit includes a diode and a pull-up resistor;
the anode of the diode is connected with the USB charging interface, the cathode of the diode is connected with one end of the pull-up resistor, and the other end of the pull-up resistor is connected with the second input end of the charging management chip.
Optionally, the first input end of the switch circuit is connected with the base charging interface through a boost circuit; the boost circuit is used for adjusting the input voltage of the boost circuit to an output voltage higher than the preset value of the input voltage.
Optionally, the terminal device further includes a housing, and the base charging interface includes a first metal connecting piece and a second metal connecting piece;
the first metal connecting sheet and the second metal connecting sheet are fixedly arranged on one side of the shell at intervals; the USB charging interface is arranged on the shell and is positioned at the gap position of the first metal connecting sheet and the second metal connecting sheet.
Optionally, the terminal device further includes a main board and a Flexible Printed Circuit (FPC) connected to the main board;
the detection circuit is arranged on the FPC, and the change-over switch circuit and the charging management chip are arranged on the mainboard.
A charging system, comprising: the terminal equipment as described in any one of the above, and a charging base connected with the terminal equipment.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the embodiment of the invention is based on the improvement of a non-standard charging mode, and the charging management chip can realize voltage detection through a simple detection circuit so as to carry out management control of quick charging, namely, a quick charging scheme with low cost and high efficiency is realized through simple circuit overlapping, and the charging time is greatly shortened.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a charging circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a voltage boost circuit according to an embodiment of the present invention.
Detailed Description
In order to make the embodiment of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without any creative efforts shall fall within the protection scope of the embodiments of the present invention.
In embodiments of the present invention, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention provides a charging circuit, which is applied to various terminal devices, the charging circuit simultaneously supports a base charging mode and a USB charging mode, and can realize DCP (Dedicated charging port) fast charging in the base charging mode, thereby improving the charging efficiency and shortening the charging time.
Referring to fig. 1, a charging circuit according to an embodiment of the present invention includes: the charging management system comprises a base charging interface, a USB charging interface, a detection circuit, a change-over switch circuit and a charging management chip.
The first input end of the change-over switch circuit is connected with the base charging interface, the second input end of the change-over switch circuit is connected with the USB charging interface, and the output end of the change-over switch circuit is connected with the first input end of the charging management chip.
The input end of the detection circuit is connected with the USB charging interface, and the output end of the detection circuit is connected with the second input end of the charging management chip.
The output end of the charging management chip is connected with the rechargeable battery.
And the detection circuit is used for detecting the voltage value of the USB charging interface and pulling up the voltage value of the second input end of the charging management chip when the voltage value of the USB charging interface is higher than a first specified threshold value.
And the change-over switch circuit is used for controlling the conduction of the first input end and the output end of the change-over switch circuit when detecting that the voltage of the first input end of the change-over switch circuit is higher than a second specified threshold value, otherwise, controlling the conduction of the second input end and the output end of the change-over switch circuit.
And the charging management chip is used for executing a DCP quick charging process on the rechargeable battery when the voltage value of the second input end of the charging management chip is higher than a third specified threshold, and otherwise executing a USB charging process on the rechargeable battery.
Specifically, the detection circuit may include: a diode and a pull-up resistor; the anode of the diode is connected with the USB charging interface, the cathode of the diode is connected with one end of the pull-up resistor, and the other end of the pull-up resistor is connected with the second input end of the charging management chip. The pull-up resistor may be 56K.
Because the rated voltage of the charging base is 5V, when the base charging interface is connected to the charging base, the base charging interface is pulled up to 5V, at the moment, the detection circuit can pull up the second input end of the charging management chip to a preset value through the pull-up resistor, and when the charging management chip identifies that the voltage value of the second output end of the charging management chip reaches the preset value, the current base charging is judged, and a DCP quick charging process is executed on the rechargeable battery.
Meanwhile, considering that the rated voltage of the charging base is 5V and supplies power for a large current, and the data line itself has impedance, which may cause voltage loss to form a voltage drop, in this embodiment, a voltage boost circuit is added between the first input terminal of the switch circuit and the charging interface of the base, and the voltage boost circuit is used to adjust the input voltage of the switch circuit to an output voltage higher than the preset value of the input voltage, so as to compensate the voltage loss.
The boost circuit may be implemented by various circuits, and is not limited. Referring to fig. 2, the boost circuit may include an enable input terminal EN and an output terminal POUT, the EN terminal is connected to the charging interface of the base, the POUT terminal is connected to the first input terminal of the switch circuit, and the POUT terminal is grounded through a first voltage-dividing resistor R4207 and a second voltage-dividing resistor R4208 connected in series. The boost circuit selects a PFM (pulse frequency modulation) mode, enables the EN end to be pulled up to DC _ IN and keeps normally open, and meanwhile, the output voltage value of the boost circuit can be adjusted by changing the resistance values of R4207 and R4208; considering that the adjusting switch switching circuit also has internal resistance, the output voltage of the booster circuit can be adjusted to 5.5V.
To sum up, the charging circuit of this embodiment is based on the improvement of nonstandard charge mode, has realized low-cost efficient fast charge scheme through simple circuit overlap joint, can realize 18W's quick charge, has greatly shortened charge time, and to 15.4 Wh's battery, it only needs 1.5h to charge for a long time.
The embodiment of the invention also provides terminal equipment which comprises the charging circuit. Based on the charging circuit, the terminal device of the embodiment supports both the USB charging mode and the base charging mode, and can realize DCP quick charging in a non-standard charging environment.
In addition, the terminal equipment further comprises a shell, and the base charging interface specifically comprises a first metal connecting sheet and a second metal connecting sheet; the first metal connecting sheet and the second metal connecting sheet are fixedly arranged on one side of the shell at intervals, and the distance between the first metal connecting sheet and the second metal connecting sheet meets the requirement of safe distance, so that the situation of short circuit can be avoided when the seat is charged; the USB interface that charges installs on the casing and is located the clearance position of first metal connecting piece and second metal connecting piece to ensure that base charge mode and USB charge mode can not go on simultaneously, further ensure safe in utilization.
It should be noted that the terminal device further includes a main board and an FPC installed inside the housing, and the detection circuit is fixedly installed on the FPC to save the area of the main board; the change-over switch circuit and the charging management chip are fixedly arranged on the mainboard, so that the distance between the change-over switch circuit and the charging management chip is shortened as much as possible, and wiring is facilitated.
In order to ensure the 3A current transmission, the signal wiring width of the power line is not less than 3 mm; the charging path is as short as possible, which can reduce the line loss of the current path, improve the charging efficiency, and shorten the electrostatic discharge path, thereby being beneficial to ESD (Electro-Static discharge) protection.
It should be noted that the terminal device may be a mobile phone, a tablet computer, a POS device, a wearable device, an in-vehicle device, an Augmented Reality (AR)/Virtual Reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a Personal Digital Assistant (PDA), and other terminal devices, and the specific type of the terminal device is not limited in the embodiment of the present invention.
Correspondingly, another embodiment of the present invention further provides a charging system, which includes a charging base and the terminal device, wherein the terminal device can be connected to the charging base through a base charging interface, and the charging base is used for realizing rapid charging for a rechargeable battery in the terminal device.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A charging circuit, comprising: the charging system comprises a base charging interface, a Universal Serial Bus (USB) charging interface, a detection circuit, a change-over switch circuit and a charging management chip;
the first input end of the change-over switch circuit is connected with the base charging interface, the second input end of the change-over switch circuit is connected with the USB charging interface, and the output end of the change-over switch circuit is connected with the first input end of the charging management chip;
the input end of the detection circuit is connected with the USB charging interface, and the output end of the detection circuit is connected with the second input end of the charging management chip;
the output end of the charging management chip is connected with a rechargeable battery;
the detection circuit is used for detecting the voltage value of the USB charging interface, and when the voltage value of the USB charging interface is higher than a first specified threshold value, the voltage value of the second input end of the charging management chip is pulled up;
the change-over switch circuit is used for controlling the conduction of the first input end and the output end of the change-over switch circuit when detecting that the voltage of the first input end of the change-over switch circuit is higher than a second specified threshold value, otherwise, controlling the conduction of the second input end and the output end of the change-over switch circuit;
the charging management chip is used for executing a special charging port DCP quick charging process on the rechargeable battery when the voltage value of the second input end of the charging management chip is higher than a third specified threshold value, otherwise executing a USB charging process on the rechargeable battery.
2. The charging circuit of claim 1, wherein the detection circuit comprises a diode and a pull-up resistor;
the anode of the diode is connected with the USB charging interface, the cathode of the diode is connected with one end of the pull-up resistor, and the other end of the pull-up resistor is connected with the second input end of the charging management chip.
3. The charging circuit of claim 1, wherein the first input terminal of the switch circuit is connected to the charging interface of the base via a boost circuit; the boost circuit is used for adjusting the input voltage of the boost circuit to an output voltage higher than the preset value of the input voltage.
4. The charging circuit of claim 3, wherein an enable input of the boost circuit is connected to the base charging interface, an output of the boost circuit is connected to the first input of the switch circuit, and an output of the boost circuit is connected to ground through a first voltage dividing resistor and a second voltage dividing resistor connected in series.
5. A terminal device characterized in that it comprises a charging circuit according to claim 1.
6. The terminal device of claim 5, wherein the detection circuit comprises a diode and a pull-up resistor;
the anode of the diode is connected with the USB charging interface, the cathode of the diode is connected with one end of the pull-up resistor, and the other end of the pull-up resistor is connected with the second input end of the charging management chip.
7. The charging circuit of claim 5, wherein the first input terminal of the switch circuit is connected to the charging interface of the base via a boost circuit; the boost circuit is used for adjusting the input voltage of the boost circuit to an output voltage higher than the preset value of the input voltage.
8. The terminal device of claim 5, further comprising a housing, wherein the base charging interface comprises a first metal tab and a second metal tab;
the first metal connecting sheet and the second metal connecting sheet are fixedly arranged on one side of the shell at intervals; the USB charging interface is arranged on the shell and is positioned at the gap position of the first metal connecting sheet and the second metal connecting sheet.
9. The terminal device according to claim 5, further comprising a main board and a flexible circuit board FPC connected to the main board;
the detection circuit is arranged on the FPC, and the change-over switch circuit and the charging management chip are arranged on the mainboard.
10. An electrical charging system, comprising: a terminal device according to any one of claims 5 to 9, and a charging base connected to the terminal device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911357087.7A CN111049220A (en) | 2019-12-25 | 2019-12-25 | Charging circuit, terminal equipment and charging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911357087.7A CN111049220A (en) | 2019-12-25 | 2019-12-25 | Charging circuit, terminal equipment and charging system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111049220A true CN111049220A (en) | 2020-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911357087.7A Pending CN111049220A (en) | 2019-12-25 | 2019-12-25 | Charging circuit, terminal equipment and charging system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5196780A (en) * | 1991-09-10 | 1993-03-23 | Pacholok David R | Ni-Cad battery charger circuit |
| JPH09233727A (en) * | 1996-02-27 | 1997-09-05 | Saitama Nippon Denki Kk | Battery charger |
| CN204497772U (en) * | 2015-02-05 | 2015-07-22 | 爱国者电子科技有限公司 | A kind of portable power source Apparatus and system of quick electric power storage |
| CN204597534U (en) * | 2015-04-13 | 2015-08-26 | 深圳市爱生百利科技有限公司 | Trickle charge selecting type charging system is filled soon with port |
| CN205621943U (en) * | 2016-05-18 | 2016-10-05 | 东莞市高圣塑胶五金有限公司 | Waterproof type charging plug |
| CN207426748U (en) * | 2017-10-26 | 2018-05-29 | Tcl-罗格朗国际电工（惠州）有限公司 | USB charging sockets |
| CN208738571U (en) * | 2018-09-04 | 2019-04-12 | Oppo广东移动通信有限公司 | Switching device |
-
2019
- 2019-12-25 CN CN201911357087.7A patent/CN111049220A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5196780A (en) * | 1991-09-10 | 1993-03-23 | Pacholok David R | Ni-Cad battery charger circuit |
| JPH09233727A (en) * | 1996-02-27 | 1997-09-05 | Saitama Nippon Denki Kk | Battery charger |
| CN204497772U (en) * | 2015-02-05 | 2015-07-22 | 爱国者电子科技有限公司 | A kind of portable power source Apparatus and system of quick electric power storage |
| CN204597534U (en) * | 2015-04-13 | 2015-08-26 | 深圳市爱生百利科技有限公司 | Trickle charge selecting type charging system is filled soon with port |
| CN205621943U (en) * | 2016-05-18 | 2016-10-05 | 东莞市高圣塑胶五金有限公司 | Waterproof type charging plug |
| CN207426748U (en) * | 2017-10-26 | 2018-05-29 | Tcl-罗格朗国际电工（惠州）有限公司 | USB charging sockets |
| CN208738571U (en) * | 2018-09-04 | 2019-04-12 | Oppo广东移动通信有限公司 | Switching device |
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Application publication date: 20200421 |