CN203722263U - Charging circuit of portable mobile terminal - Google Patents
Charging circuit of portable mobile terminal Download PDFInfo
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- CN203722263U CN203722263U CN201320786575.1U CN201320786575U CN203722263U CN 203722263 U CN203722263 U CN 203722263U CN 201320786575 U CN201320786575 U CN 201320786575U CN 203722263 U CN203722263 U CN 203722263U
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- 239000004065 semiconductor Substances 0.000 claims description 53
- 101150020786 CHGB gene Proteins 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a charging circuit of a portable mobile terminal. The charging circuit comprises a USB interface, a charging management module, a battery interface, a USB interface, an unidirectional connection module and a switch switching module for switching a power supplying mode of a system module of a portable mobile terminal. The USB interface, the charging management module and the battery interface are connected in order. The first end of the switch switching module is connected with the USB interface, the charging management module and the positive electrode of the unidirectional connection module. The second end of the switch switching module is connected with the positive electrode of the battery interface. The third end of the switch switching module is connected with the system module and the negative electrode of the unidirectional connection module. The charging circuit switches the power supplying mode of the system module of the mobile terminal through the switch switching module when a battery is charged, thus the battery is only charged and does not discharge, and therefore the battery can be charged fully, and the stability and the reliability of the charging circuit are raised.
Description
Technical field
The utility model relates to small-sized electronic product, particularly a kind of charging circuit of portable mobile termianl.
Background technology
Along with Wearable electronic product is more and more subject to consumer's favor, many money Wearable electronic products have been there are in the market, such as intelligent glasses, intelligent watch etc., also have some portable portable electronic products, the most of compact size of these products, owing to being subject to volume restrictions, can only be used the powered battery that volume is little, capacity is also little, and in order to improve user experience, often use the lithium battery of rechargeable type.
Because small product size is less, the size of PCB is also limited, cannot add complete battery charge control circuit, and the problem that existing charging circuit often exists battery to be not fully filled.Refer to Fig. 1, it is the schematic diagram of existing Wearable electronic product charging circuit.As shown in Figure 1, existing Wearable electronic product charging circuit by USB interface external charge power supply (as charger, computer etc.), charges the battery by a charging management chip when charging, in charging, by battery, to the system module of electronic product, powered.
Above-mentioned charging circuit, when charging, is generally divided into three phases, first carries out the trickle charge of little electric current, to protect battery when voltage is lower; Deng voltage, be charged to after certain value, then carry out the constant current charge of larger electric current, after the maximum charging voltage that reaches battery, start constant voltage charge, in this process, electric current can slowly diminish, until just think that battery is full of after being less than certain value.Owing to wearing, the volume of formula electronic product is little, battery capacity is little, and charging current can not be too large, often only has tens milliamperes, and trickle during precharge only has several milliamperes.
From above-mentioned charging circuit, battery is another directly in electric discharge in charging, if by above-mentioned three phases charging, if battery first carries out trickle preliminary filling after discharging completely, because electric current is pulled away by rear level system, electric current causes not fill not possibly, even if it is substantial also can to cause battery to be full of when charging normal.
Thereby prior art need to improve.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is to provide a kind of charging circuit of portable mobile termianl, can be full of battery completely, improves the stability of charging circuit.
In order to achieve the above object, the utility model has been taked following technical scheme:
A kind of charging circuit of portable mobile termianl, comprise USB interface, charge management module and battery interface, described USB interface, charge management module and battery interface are connected successively, and it also comprises one-way conduction module and for switching the switching over module of supply power mode of the system module of portable mobile termianl; The first end of described switching over module connects the positive pole of USB interface, charge management module and one-way conduction module, the second end of switching over module connects the positive pole of battery interface, and the 3rd end of switching over module connects the negative pole of described system module and described one-way conduction module.
In the charging circuit of described portable mobile termianl, described switching over module comprises the first metal-oxide-semiconductor, the second metal-oxide-semiconductor and the first resistance, the grid of described the first metal-oxide-semiconductor connects the VCC end of USB interface and the grid of the second metal-oxide-semiconductor, also passes through the first grounding through resistance, the drain electrode of described the first metal-oxide-semiconductor connects the negative pole of one-way conduction module, and the source electrode of described the first metal-oxide-semiconductor connects the source electrode of the second metal-oxide-semiconductor; The drain electrode of described the second metal-oxide-semiconductor connects the positive pole of battery interface.
In the charging circuit of described portable mobile termianl, described the first metal-oxide-semiconductor and the second metal-oxide-semiconductor are P channel MOS tube.
In the charging circuit of described portable mobile termianl, described one-way conduction module comprises Schottky diode, the 1st end the 2nd end unsettled, Schottky diode of described Schottky diode connects the VCC end of USB interface, and the 3rd end of Schottky diode connects the drain electrode of the first metal-oxide-semiconductor.
In the charging circuit of described portable mobile termianl, the model of described Schottky diode is BAT54C.
In the charging circuit of described portable mobile termianl, described charge management module comprises charging management chip, the second resistance, the 3rd resistance and the first electric capacity; The Prog of described charging management chip holds the CHGb that passes through the second grounding through resistance, charging management chip to hold the VBAT by the 3rd resistance connection TL_VCC3.3V feeder ear, charging management chip to hold the positive pole of connection battery interface and the drain electrode of the second metal-oxide-semiconductor, and the VCC that the VCC end of charging management chip passes through connection USB interface holds, also passes through the first capacity earth.
In the charging circuit of described portable mobile termianl, the model of described charging management chip is WS4502.
In the charging circuit of described portable mobile termianl, described USB interface is MICRO USB interface.
Compared to prior art, the charging circuit of the portable mobile termianl that the utility model provides, when battery charges, by switching over module, switch the supply power mode of the system module of mobile terminal, battery is only charged need not discharge, thereby can be full of battery completely, improve stability and the reliability of charging circuit.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of existing Wearable electronic product charging circuit.
Fig. 2 is the structured flowchart of the charging circuit of the utility model portable mobile termianl.
Fig. 3 is the circuit diagram of the charging circuit of the utility model portable mobile termianl.
Embodiment
The utility model provides a kind of charging circuit of portable mobile termianl, for making the purpose of this utility model, technical scheme and effect clearer, clear and definite, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 2, the charging circuit of portable mobile termianl of the present utility model comprises usb 10, charge management module 20, battery interface 30, one-way conduction module 40 and switching over module 50.Usb 10, charge management module 20 and battery interface 30 are connected successively, described battery interface 30 is for installing rechargeable battery, external charge current in usb 10 input charge management module 20, carries out charging the battery after voltage and current processing through charge management module 20 successively.
The first end of described switching over module 50 connects the positive pole of usb 10, charge management module 20 and one-way conduction module 40, the second end of switching over module 50 connects the positive pole of battery interface 30, and the 3rd end of switching over module 50 connects the negative pole of described system module and described one-way conduction module 40.Described system module comprises each functional module (as power management module, base band etc.) of mobile terminal, described switching over module 50 is for switching the supply power mode of the system module of portable mobile termianl, when usb 10 does not have external charge power supply, switching over module 50 is opened battery is powered to system module; When usb 10 external charge power supply charges the battery, described switching over module 50 is closed, disconnect the power supply between battery and system module, now from the electric current of usb 10 input, by charge management module 20, charge the battery on the one hand, through one-way conduction module 40, to system module, power on the other hand, therefore battery is when charging, and the situation that does not exist battery to put while filling, can guarantee that battery electric quantity is full of completely.
In this example, described usb 10 is MICRO usb 10, and it comprises ID end, VCC end, DM end, DP end and three earth terminals.Described switching over module 50 comprises the first metal-oxide-semiconductor P1, the second metal-oxide-semiconductor P2 and the first resistance R 1, the grid of described the first metal-oxide-semiconductor P1 connects the VCC end of usb 10 and the grid of the second metal-oxide-semiconductor P2, also passes through the first resistance R 1 ground connection, the drain electrode of described the first metal-oxide-semiconductor P1 connects the negative pole of one-way conduction module 40, and the source electrode of described the first metal-oxide-semiconductor P1 connects the source electrode of the second metal-oxide-semiconductor P2; The drain electrode of described the second metal-oxide-semiconductor P2 connects the positive pole of battery interface 30.Wherein, described the first metal-oxide-semiconductor P1 and the second metal-oxide-semiconductor P2 are P channel MOS tube, and described the first resistance R 1 is pull down resistor.
When usb 10 does not insert charge power supply, the grid of the first metal-oxide-semiconductor P1 and the second metal-oxide-semiconductor P2 is low level, now the first metal-oxide-semiconductor P1 and the second metal-oxide-semiconductor P2 conducting, the electric current of battery output is powered to the system module of mobile terminal through the second metal-oxide-semiconductor P2 and the first metal-oxide-semiconductor P1 successively; When usb 10 is circumscribed with the charging voltage of 5V, the grid of the first metal-oxide-semiconductor P1 and the second metal-oxide-semiconductor P2 is drawn high as high level, now the first metal-oxide-semiconductor P1 and the second metal-oxide-semiconductor P2 cut-off, disconnected the power supply of battery to system module, now from the electric current of usb 10 input, through charge management module 20, charge the battery on the one hand, on the other hand through one-way conduction module 40 to system module power supply, make battery when charging without putting while filling, guarantee that battery can be full of completely; When pulling out charge power supply, effect due to the first resistance R 1, make the grid of the first metal-oxide-semiconductor P1 and the second metal-oxide-semiconductor P2 again become low level, make the first metal-oxide-semiconductor P1 and the second metal-oxide-semiconductor P2 conducting, battery is powered to system module by the second metal-oxide-semiconductor P2 and the first metal-oxide-semiconductor P1, now one-way conduction module 40 can guarantee that the TL_VDDIN electric current of system module can instead not be poured into usb 10 one end, thereby can not affect front stage circuits.
Certainly, in other embodiments, described switching over module 50 can also be selected other electronic component with switching function or circuit, and as PNP triode, N links up the switching circuit of metal-oxide-semiconductor and inverter composition etc.
See also Fig. 3, described one-way conduction module 40 comprises Schottky diode U1, the 1st end the 2nd end unsettled, Schottky diode U1 of described Schottky diode U1 connects the VCC end of usb 10, and the 3rd end of Schottky diode U1 connects drain electrode and the system module of the first metal-oxide-semiconductor P1.
The model of described Schottky diode U1 is BAT54C, the Schottky diode of this model can prevent that battery is when charging, the TL_VDDIN current flowing backwards of system module is wired back and is pressed lower battery one end, impact charges normal, also in order to reduce the pressure drop on battery feed circuit, increase service time of battery simultaneously.
Please continue to refer to Fig. 3, described charge management module 20 comprises charging management chip U2, the second resistance R 2, the 3rd resistance R 3 and the first capacitor C 1; The model of described charging management chip U2 is WS4502, the Prog of charging management chip U2 holds the CHGb that passes through the second resistance R 2 ground connection, charging management chip U2 to hold the VBAT by the 3rd resistance R 3 connection TL_VCC3.3V feeder ears, charging management chip U2 to hold the positive pole of connection battery interface 30 and the drain electrode of the second metal-oxide-semiconductor P2, and the VCC that the VCC end of charging management chip U2 passes through connection usb 10 holds, also passes through the first capacitor C 1 ground connection.The voltage of usb 10 input, from the VCC end of charging management chip U2, is given charging management chip U2 power supply, and charging voltage is held output to enter battery interface 30 by VBAT and charged the battery.
In sum, the charging circuit of the portable mobile termianl that the utility model provides, when battery charges, by switching over module, switch the supply power mode of the system module of mobile terminal, battery is only charged need not discharge, thereby can be full of battery completely, improve stability and the reliability of charging circuit.The utility model only increases several simple electronic components and forms charging circuit, when battery can be full of completely, also has simple, practical feature.
Be understandable that; for those of ordinary skills; can be equal to replacement or change according to the technical solution of the utility model and utility model design thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the utility model.
Claims (8)
1. the charging circuit of a portable mobile termianl, comprise USB interface, charge management module and battery interface, described USB interface, charge management module and battery interface are connected successively, it is characterized in that, also comprise one-way conduction module and for switching the switching over module of supply power mode of the system module of portable mobile termianl; The first end of described switching over module connects the positive pole of USB interface, charge management module and one-way conduction module, the second end of switching over module connects the positive pole of battery interface, and the 3rd end of switching over module connects the negative pole of described system module and described one-way conduction module.
2. the charging circuit of portable mobile termianl according to claim 1, it is characterized in that, described switching over module comprises the first metal-oxide-semiconductor, the second metal-oxide-semiconductor and the first resistance, the grid of described the first metal-oxide-semiconductor connects the VCC end of USB interface and the grid of the second metal-oxide-semiconductor, also passes through the first grounding through resistance, the drain electrode of described the first metal-oxide-semiconductor connects the negative pole of one-way conduction module, and the source electrode of described the first metal-oxide-semiconductor connects the source electrode of the second metal-oxide-semiconductor; The drain electrode of described the second metal-oxide-semiconductor connects the positive pole of battery interface.
3. the charging circuit of portable mobile termianl according to claim 2, is characterized in that, described the first metal-oxide-semiconductor and the second metal-oxide-semiconductor are P channel MOS tube.
4. the charging circuit of portable mobile termianl according to claim 2, it is characterized in that, described one-way conduction module comprises Schottky diode, the 1st end the 2nd end unsettled, Schottky diode of described Schottky diode connects the VCC end of USB interface, and the 3rd end of Schottky diode connects the drain electrode of the first metal-oxide-semiconductor.
5. the charging circuit of portable mobile termianl according to claim 4, is characterized in that, the model of described Schottky diode is BAT54C.
6. the charging circuit of portable mobile termianl according to claim 2, is characterized in that, described charge management module comprises charging management chip, the second resistance, the 3rd resistance and the first electric capacity; The Prog of described charging management chip holds the CHGb that passes through the second grounding through resistance, charging management chip to hold the VBAT by the 3rd resistance connection TL_VCC3.3V feeder ear, charging management chip to hold the positive pole of connection battery interface and the drain electrode of the second metal-oxide-semiconductor, and the VCC that the VCC end of charging management chip passes through connection USB interface holds, also passes through the first capacity earth.
7. the charging circuit of portable mobile termianl according to claim 6, is characterized in that, the model of described charging management chip is WS4502.
8. the charging circuit of portable mobile termianl according to claim 1, is characterized in that, described USB interface is MICRO USB interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320786575.1U CN203722263U (en) | 2013-12-04 | 2013-12-04 | Charging circuit of portable mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320786575.1U CN203722263U (en) | 2013-12-04 | 2013-12-04 | Charging circuit of portable mobile terminal |
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| Publication Number | Publication Date |
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| CN203722263U true CN203722263U (en) | 2014-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320786575.1U Expired - Fee Related CN203722263U (en) | 2013-12-04 | 2013-12-04 | Charging circuit of portable mobile terminal |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092267A (en) * | 2014-07-28 | 2014-10-08 | 深圳市至高通信技术发展有限公司 | Intelligent terminal |
| 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 |
| CN104901319A (en) * | 2015-05-13 | 2015-09-09 | 安徽立卓智能电网科技有限公司 | Photovoltaic power plant AVC control method |
| CN104092267B (en) * | 2014-07-28 | 2017-01-04 | 深圳市至高通信技术发展有限公司 | A kind of intelligent terminal |
| CN115207997A (en) * | 2021-04-14 | 2022-10-18 | 舜宇光学（浙江）研究院有限公司 | Power supply system, control method and power supply equipment |
-
2013
- 2013-12-04 CN CN201320786575.1U patent/CN203722263U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092267A (en) * | 2014-07-28 | 2014-10-08 | 深圳市至高通信技术发展有限公司 | Intelligent terminal |
| CN104092267B (en) * | 2014-07-28 | 2017-01-04 | 深圳市至高通信技术发展有限公司 | A kind of intelligent terminal |
| 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 |
| CN104901319A (en) * | 2015-05-13 | 2015-09-09 | 安徽立卓智能电网科技有限公司 | Photovoltaic power plant AVC control method |
| CN115207997A (en) * | 2021-04-14 | 2022-10-18 | 舜宇光学（浙江）研究院有限公司 | Power supply system, control method and power supply equipment |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140716 Termination date: 20141204 |
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| EXPY | Termination of patent right or utility model |