CN102110998B - Judging circuit of charge power supply - Google Patents
Judging circuit of charge power supply Download PDFInfo
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- CN102110998B CN102110998B CN200910312133.1A CN200910312133A CN102110998B CN 102110998 B CN102110998 B CN 102110998B CN 200910312133 A CN200910312133 A CN 200910312133A CN 102110998 B CN102110998 B CN 102110998B
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- power supply
- charge power
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Abstract
The invention provides a judging circuit of a charge power supply, and the judging circuit is connected with the mini USB (universal serial bus) interface of a portable electronic device and used for judging whether the charg power supply connected to the mini USB interface is a charger or a computer. The judging circuit of the charg power supply comprises a central processing unit, a first pin and a second pin, and also comprises a metal oxide semiconductor field effect transistor (MOSFET), wherein the grid electrode of the MOSFET is electrically connected to the first pin or the second pin; the drain electrode of the MOSFET is electrically connected to the central processing unit; the high and low level variation of the first pin or the second pin is converted into a judging signal through the MOSFET, and the judging signal is output to the central processing unit; and the central processing unit judges the type of the charg power supply based on the level state of the judging signal.
Description
Technical field
The present invention relates to a kind of circuit, relate in particular to a kind of charge power supply decision circuitry.
Background technology
Along with scientific and technological development, the portable electron devices such as mobile phone, personal digital assistant, MP3 (dynamic image expert compression standard audio frequency aspect 3, Moving Picture Experts Group Audio Layer III) player are widely used in daily life.And USB (Universal Serial Bus, USB) with its novelty, convenience, general feature, popularize rapidly, most portable electron device is all with a mini USB (miniUniversal Serial Bus, mini USB) interface and part portable electron device can utilize this mini USB interface to charge, by a USB cable, be connected to a charger or USB interface of computer, so that this portable electron device is charged.Because general charger is different from the charging current of computer, so portable electron device to be charged need judge these two kinds of different charge modes.
General USB interface and mini USB interface all have a power pins, a D+ pin, a D-pin and a grounding pin, and wherein this D+ pin and this D-pin are for transmission of data signals.Traditional determination methods is generally to connect respectively some minutes piezoelectricity groups on the D+ of the mini of portable electron device USB interface end and D-pin, different due to charger and USB interface of computer internal wiring, at the D+ in portable electron device or D-pin after electric resistance partial pressure, for charger or USB interface of computer charging, have different low and high level variations, judgement is charger charging or USB interface of computer charging thus.
But above-mentioned decision circuitry is because increase has several divider resistances, and not only circuit connects complexity, and can take the more space of portable electron device, is unfavorable for that portable electron device is toward short, little, light, thin future development.
Summary of the invention
In view of this, be necessary to provide a kind of circuit simply and not to take the charge power supply decision circuitry of too much volume.
A kind of charge power supply decision circuitry, it is connected with the mini USB interface of a portable electron device, for judging that the charge power supply of this mini USB interface of access is a charger or a computer, this charge power supply decision circuitry comprises a central processing unit, one first pin and one second pin, described charge power supply decision circuitry also comprises a metal oxide semiconductor field effect tube, the grid of this metal oxide semiconductor field effect tube is electrically connected to this first pin or this second pin, the drain electrode of this metal oxide semiconductor field effect tube is electrically connected to this central processing unit, the low and high level variation of this first pin or this second pin converts a judgement signal to by this metal oxide semiconductor field effect tube and exports this central processing unit to, this central processing unit is by the type of the level state judgement charge power supply of this judgement signal.
Compared to prior art, described charge power supply decision circuitry by being connected to metal oxide semiconductor field effect tube on this first pin or the second pin, according to the difference of the internal circuit of USB interface of the USB interface of this charger and this computer own, at this first pin or the second pin, can produce different low and high level variations, and by this metal oxide semiconductor field effect tube, convert this variation to a judgement signal and be passed to this central processing unit, and enter corresponding charge mode by the judgement of this central processing unit.
Accompanying drawing explanation
The charger USB interface pin function structure chart of Fig. 1 for matching with charge power supply decision circuitry better embodiment of the present invention.
Fig. 2 is the USB interface of computer pin function structure chart coordinating with charge power supply decision circuitry better embodiment of the present invention.
Fig. 3 is the circuit structure diagram of charge power supply decision circuitry better embodiment of the present invention.
Main element symbol description
| |
10、20 |
| Out- |
11、21 |
| D- |
12、22、312 |
| |
13、23、313 |
| Grounding |
14、24、314 |
| |
25 |
| Charge power |
30 |
| Mini |
31 |
| Input power pin | 311 |
| |
33 |
| Grid | 331 |
| Source electrode | 332 |
| Drain |
333 |
| Central processing unit | 35 |
| |
37 |
| USB- |
371 |
| USB- |
373 |
Embodiment
Charge power supply decision circuitry of the present invention is applicable to the portable electron device that mobile phone, personal digital assistant, MP3 player etc. have mini USB interface and can use this interface charging.
Refer to Fig. 1, the usb 10 of a charger comprises 4 pins, and it is respectively: out-put supply pin 11, D-pin 12, D+ pin 13 and grounding pin 14.Wherein between this D-pin 12 and D+ pin 13, short circuit connects.
Refer to Fig. 2, a USB interface of computer 20 comprises 4 pins, and it is respectively: out-put supply pin 21, D-pin 22, D+ pin 23 and grounding pin 24.Wherein this D-pin 22 and D+ pin 23 also connect respectively a drop-down resistance R 1, R2 to ground for transmission of data signals.The resistance of this pull down resistor R1, R2 is 15K ohm.Described D-pin 22 and D+ pin 23 are connected to the usb signal transceiver 25 in this main frame, for transmitting data.
Refer to Fig. 3, better embodiment charge power supply decision circuitry 30 of the present invention comprises a mini USB interface 31, a metal oxide semiconductor field effect tube (Metal-Oxide Semiconductor Field Effect Transisitor, MOSFET) 33, one central processing unit 35 and a USB interface chip 37.This MOSFET33 and this USB interface chip 37 are all electrically connected with this central processing unit 35.This mini USB interface 31 comprises following 4 pins: input power pin 311, the first pin, the second pin and grounding pin 314.In the present embodiment, this first pin and the second pin are respectively D-pin 312, D+ pin 313 these D-pins 312, D+ pin 313 for transmission of data signals.In the present embodiment, this MOSFET33 is a N-channel MOS FET (N-MOSFET), and its grid 331 is electrically connected to this D-pin 312; Its source electrode 332 ground connection; Its drain electrode 333 is electrically connected to this central processing unit 35 and exports a judgement signal to this central processing unit 35.If this grid 331 is high level, this MOSFET33 conducting, this drain electrode 333 is low level; If this grid 331 is low level, this MOSFET33 cut-off, this drain electrode 333 is high level.What this central processing unit 35 can judge that the height of the level of signal judges that this charge power supply decision circuitry 30 connects according to this is charger or computer, and enters corresponding charge mode according to judged result.This USB interface chip 37 comprises a USB-D-P pin 371 and a USB-D-M pin 373, it is electrically connected with this D-pin 312 and D+ pin 313 respectively, for receiving from this D-pin 312 and D+ pin 313, transmit the data-signal of coming, and this data-signal is forwarded to this central processing unit 35.
When described charger is connected to the portable electron device with this charge power supply decision circuitry 30, each pin of described usb 10 and the corresponding electric connection of each pin of this mini USB interface 31, now, because this D-pin 312 and D+ pin 313 are short circuit state, this USB interface chip 37 makes this D-pin 312 and D+ pin 313 always in high level state automatically, the grid 331 of this MOSFET33 is high level always, this MOSFET33 conducting, the judgement signal that connects its drain electrode 333 is low level; This central processing unit 35 detects this and is after low level judgement signal, enables corresponding charger charge mode.
When described USB interface of computer 20 is connected to this charge power supply decision circuitry 30, the corresponding electric connection of pin of described USB interface 20 and this miniUSB interface 31, now, because can sending one group of signal by this D-pin 22 and D+ pin 23 by this usb signal transceiver 25, this computer inquires whether need to carry out transfer of data, this group signal is one group of binary code, shows as the variation of low and high level on this D-pin 22 and D+ pin 23.The conducting and the cut-off state that are connected to this MOSFET33 of this D+ pin 23 also can produce corresponding variation, correspondingly this judgement signal is in the short time, for example in 0.1 second, also have the variation of low and high level, the low and high level that this central processing unit 35 detected this judgement signal in 0.1 second changes, and enables corresponding USB interface of computer charge mode.
The grid 331 that is appreciated that described MOSFET33 also can be connected to this D-pin 312, and because short circuit between the D-pin 12 of this charger and D+ pin 13 connects, this D-pin 12 is all high level, makes this MOSFET33 conducting, and this judgement signal is low level.And the low and high level variation of the D-pin of this USB interface of computer 20 in 22 short time also can make this judgement signal present low and high level variation accordingly.This central processing unit 35 can judge that signal enters corresponding charge mode according to this thus.
Compared to prior art, charge power supply decision circuitry of the present invention is by being connected to a MOSFET33 on the D-pin 312 in this mini USB interface or D+ pin 313, according to the difference of this charger usb 10 and this USB interface of computer 20 internal circuits own, at this D-pin 312 or D+ pin 313, can produce different low and high level variations, and by this MOSFET33, convert this variation to a judgement signal and be passed to this central processing unit 35, and enter corresponding charge mode by the judgement of this central processing unit 35.
In addition, those skilled in the art also can make various modifications, interpolation and the replacement in other forms and details in the claims in the present invention scope of disclosure and spirit.Certainly, the variations such as various modifications, interpolation and replacement that these are made according to spirit of the present invention, within all should being included in the present invention's scope required for protection.
Claims (4)
1. a charge power supply decision circuitry, it is connected with the mini USB interface of a portable electron device, for judging that the charge power supply of this mini USB interface of access is a charger or a computer, described computer comprises usb signal transceiver, this mini USB interface comprises one first pin and the second pin, this charge power supply decision circuitry comprises a central processing unit, it is characterized in that: described charge power supply decision circuitry also comprises a metal oxide semiconductor field effect tube, the grid of this metal oxide semiconductor field effect tube is electrically connected to this first pin or this second pin, the drain electrode of this metal oxide semiconductor field effect tube is electrically connected to this central processing unit, the low and high level variation of this first pin or this second pin converts a judgement signal to by this metal oxide semiconductor field effect tube and exports this central processing unit to, this central processing unit is by the type of the level state judgement charge power supply of this judgement signal, when this mini USB interface accesses described computer, this metal oxide semiconductor field effect tube receives one group of binary code of the usb signal transceiver output of described computer by described the first pin or the second pin, and output is the judgement signal that low and high level changes.
2. charge power supply decision circuitry as claimed in claim 1, is characterized in that: described metal oxide semiconductor field effect tube is a N NMOS N-channel MOS N field effect transistor.
3. charge power supply decision circuitry as claimed in claim 1, is characterized in that: when this first pin or this second pin are high level, this judgement signal is low level; When this first pin or this second pin are low level, this judgement signal is high level.
4. charge power supply decision circuitry as claimed in claim 1, is characterized in that: when described judgement signal level is constant, this charge power supply is charger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910312133.1A CN102110998B (en) | 2009-12-23 | 2009-12-23 | Judging circuit of charge power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910312133.1A CN102110998B (en) | 2009-12-23 | 2009-12-23 | Judging circuit of charge power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102110998A CN102110998A (en) | 2011-06-29 |
| CN102110998B true CN102110998B (en) | 2014-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910312133.1A Expired - Fee Related CN102110998B (en) | 2009-12-23 | 2009-12-23 | Judging circuit of charge power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102110998B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102306853B (en) * | 2011-08-10 | 2014-08-06 | 深圳市力可普尔电子有限公司 | Intelligently-identified charging method and device as well as connector |
| CN102681963B (en) * | 2012-04-25 | 2018-03-20 | 康佳集团股份有限公司 | A kind of electronic equipment and its charging or upgrade processing method and switching circuit |
| CN109787317B (en) * | 2019-02-22 | 2023-08-29 | 共青城市超能电子科技有限公司 | Battery on air-conditioning suit and power supply line thereof |
| CN114465057B (en) * | 2022-02-22 | 2023-11-03 | 成都天奥电子股份有限公司 | Charging and multiple data communication interface supporting forward and backward insertion |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101232196A (en) * | 2008-02-02 | 2008-07-30 | 中兴通讯股份有限公司 | Control circuit of charging mode in USB charging stand and method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7421594B2 (en) * | 2002-08-21 | 2008-09-02 | Fujitsu Limited | Bus power device and power-source control method |
| US7271568B2 (en) * | 2004-02-11 | 2007-09-18 | Research In Motion Limited | Battery charger for portable devices and related methods |
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2009
- 2009-12-23 CN CN200910312133.1A patent/CN102110998B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101232196A (en) * | 2008-02-02 | 2008-07-30 | 中兴通讯股份有限公司 | Control circuit of charging mode in USB charging stand and method thereof |
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| Publication number | Publication date |
|---|---|
| CN102110998A (en) | 2011-06-29 |
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Free format text: FORMER OWNER: CHI MEI COMMUNICATION SYSTEMS, INC. Effective date: 20150902 Owner name: GUANGDONG HUABO ENTERPRISE MANAGEMENT CONSULTING C Free format text: FORMER OWNER: SHENZHEN FUTAIHONG PRECISION INDUSTRY CO., LTD. Effective date: 20150902 Owner name: HENAN LEISHUO OPTOELECTRONICS TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: GUANGDONG HUABO ENTERPRISE MANAGEMENT CONSULTING CO., LTD. Effective date: 20150902 |
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Effective date of registration: 20150902 Address after: 475400 Henan Zhoukou Taikang County Industrial Agglomeration Area Patentee after: Henan Leishuo Optoelectronics Technology Co.,Ltd. Address before: 715, No. 371-1, main building, No. five, 510630 mountain road, Guangzhou, Guangdong, Tianhe District Patentee before: GUANGDONG HUABO ENTERPRISE MANAGEMENT CONSULTING Co.,Ltd. Effective date of registration: 20150902 Address after: 715, No. 371-1, main building, No. five, 510630 mountain road, Guangzhou, Guangdong, Tianhe District Patentee after: GUANGDONG HUABO ENTERPRISE MANAGEMENT CONSULTING Co.,Ltd. Address before: 518109 F3 building, Foxconn science and Technology Industrial Park, Longhua Town, Shenzhen, Guangdong, A, China Patentee before: Shenzhen Futaihong Precision Industry Co.,Ltd. Patentee before: Chi Mei Communication Systems, Inc. |
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