CN106483378A - A kind of D+/D- pin spurious impedance detection circuit in USB interface mobile device quick charge control - Google Patents
A kind of D+/D- pin spurious impedance detection circuit in USB interface mobile device quick charge control Download PDFInfo
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- CN106483378A CN106483378A CN201510534322.9A CN201510534322A CN106483378A CN 106483378 A CN106483378 A CN 106483378A CN 201510534322 A CN201510534322 A CN 201510534322A CN 106483378 A CN106483378 A CN 106483378A
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Abstract
The present invention is that methods described is mainly included the following steps that with regard to the D+/D- pin spurious impedance detection circuit in a kind of USB interface mobile device quick charge control：Intelligence USB interface D-/D+ pin is set in charge controller circuit is detected to GND/VBUS spurious impedance；The D-/D+ pin of moment monitoring USB is to GND/VBUS insulation status；Feedback of status will be detected at any time to charge controller；Charge controller then decides whether to set up communication and then output voltage electric current according to impedance detection result.The present invention quickly can accurately detect the impedance between USB interface D-/D+ pin and VBUS and GND, and detection threshold value is adjustable, and decision circuitry is swift in response, strong antijamming capability, overcome caused due to insulation degradation in prior art to device damage and personal injury.
Description
Technical field
The present invention relates to the D+/D- pin spurious impedance detection circuit in a kind of charge control, the D+/D- pin spurious impedance detection circuit in more particularly to a kind of USB interface mobile device quick charge control.
Technical background
Since Apple (Apple, Inc.) announced to release first iPhone smart mobile phone on January 9th, 2007, Intelligent mobile equipment market obtains, in the whole world, explosive increase of knowing clearly, and smart mobile phone has obtained widely available.Especially recently as the development that mobile Internet is swift and violent, objectively boosting smart mobile phone App multifarious application, as market is risen suddenly and sharply to the demand of Intelligent mobile equipment application, especially large-size screen monitors mobile device (mobile phone in recent years, PAD popularization and application), causes the great increase of high capacity cell consumption.
When using high capacity cell, user generally denounces, and the charging interval is long, and the therefore invention of rapid nitriding is extremely necessary.But in rapid nitriding, the D+/D- pin of USB carries the function of communicating between charger and mobile phone.Reality is in prolonged use, especially because dust and other uncertain factors, may cause D+/D- pin insulation against ground effect to deteriorate, it is possible to so that D+/D- pin assumes low impedance characteristic to VBUS or GND.Consequently, it is possible to cause the function of communicating between charger and mobile phone to produce disorderly, error code even interrupting, the high pressure of charger output error is ultimately resulted in, jeopardizes the personal safety of equipment and user.
As shown in the above description, current rapid nitriding yet suffers from potential safety hazard, it is therefore necessary to seek more preferably solution.
Content of the invention
The invention provides the D+/D- pin spurious impedance detection circuit in a kind of USB interface mobile device quick charge control, can provide not only safety but also quick rational charging voltage and electric current, the charging of strict guarantee equipment and use safely.Described below：
A kind of D+/D- pin spurious impedance detection circuit in USB interface mobile device quick charge control, the method comprising the steps of：
1) intelligence USB interface D-/D+ pin is set in charge controller circuit is detected to GND/VBUS spurious impedance.
2) the D-/D+ pin of monitoring USB is to GND/VBUS insulation status.
3) feedback of status will be detected to charge controller.
4) charge controller decides whether to set up communication and then output voltage electric current according to impedance detection result.
The beneficial effect of technical scheme that the present invention is provided is：The core of rapid nitriding is that charger provides high voltage, high current to mobile device, the present invention can accurately detect the impedance between USB interface D-/D+ pin and VBUS and GND real-time, detection threshold value is adjustable, and multilevel iudge circuit is swift in response strong antijamming capability.Communication line is used as by Device-General USB interface pin D-, it is intended that charger provides both safe and fast rational charging voltage and electric current, the charging of strict guarantee equipment and use safety.
By being incorporated in the present specification and becoming part thereof of accompanying drawing and detailed description below, the above-mentioned characteristic of the present invention and advantage will be able to more detailed description, and the drawings and specific embodiments are used for being illustrated by way of example the principle of the present invention together.
Description of the drawings
Fig. 1 is the circuit block diagram of the present invention.
Specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described in further detail below in conjunction with accompanying drawing.
In order to accurately detect the impedance between USB interface D-/D+ pin and VBUS and GND real-time, detection threshold value is adjustable, specified charger provides both safe and fast rational charging voltage and electric current, the charging of strict guarantee equipment and use safety, the D+/D- pin spurious impedance detection circuit in a kind of USB interface mobile device quick charge control is embodiments provided, described below：
Referring to Fig. 1：In the present invention, R1 and R2 represent dead resistance, and Rp1 and Rp2 is chip internal resistance.
1) S2 switch closes, and electric capacity Cs both end voltage is：
2) S2 is then turned off, as the voltage of electric capacity Cs can not be mutated, then：
3) last, S3 is closed：
.
Claims (4)
1. the D+/D- pin spurious impedance in a kind of USB interface mobile device quick charge control detects circuit, it is characterised in that
Methods described includes the following steps：
1) intelligence USB interface D-/D+ pin is set in charge controller circuit is detected to GND/VBUS spurious impedance.
2) the D-/D+ pin of monitoring USB is to GND/VBUS insulation status.
3) feedback of status will be detected to charge controller.
4) charge controller decides whether to set up communication and then output voltage electric current according to impedance detection result.
2. the D+/D- pin spurious impedance during a kind of USB interface mobile device quick charge according to claim 1 controls
Detection circuit it is characterized in that：Designed using switched-capacitor circuit, while reducing power consumption, realize adopting for impedance detection threshold voltage
Sample.
3. the D+/D- pin spurious impedance during a kind of USB interface mobile device quick charge according to claim 1 controls
Detection circuit it is characterized in that：By multinomial clock control, realize the detection of voltage and threshold voltage in dead resistance and compare.
4. the D+/D- pin spurious impedance during a kind of USB interface mobile device quick charge according to claim 1 controls
Detection circuit it is characterized in that：Threshold voltage can adjust, to adapt to various application conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510534322.9A CN106483378A (en) | 2015-08-27 | 2015-08-27 | A kind of D+/D- pin spurious impedance detection circuit in USB interface mobile device quick charge control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510534322.9A CN106483378A (en) | 2015-08-27 | 2015-08-27 | A kind of D+/D- pin spurious impedance detection circuit in USB interface mobile device quick charge control |
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| Publication Number | Publication Date |
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| CN106483378A true CN106483378A (en) | 2017-03-08 |
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| CN201510534322.9A Pending CN106483378A (en) | 2015-08-27 | 2015-08-27 | A kind of D+/D- pin spurious impedance detection circuit in USB interface mobile device quick charge control |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554240A (en) * | 2019-09-09 | 2019-12-10 | Oppo（重庆）智能科技有限公司 | Impedance detection circuit and method for charging interface and terminal equipment |
| CN111142058A (en) * | 2020-01-02 | 2020-05-12 | 联芸科技（杭州）有限公司 | Resistance detection device and method |
| EP3901641A1 (en) * | 2020-04-20 | 2021-10-27 | Delta Electronics (Shanghai) Co., Ltd. | Insulation impedance detection circuit for on-board charger and insulation impedance detection method |
| CN114264863A (en) * | 2022-01-04 | 2022-04-01 | 超旸半导体(上海)有限公司 | Current limiting value detection method and detection device for DC/DC converter |
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| CN204407944U (en) * | 2015-01-12 | 2015-06-17 | 深圳市飞天鹰科技有限公司 | The Function detection circuit of tool intelligence USB identification chip |
| CN104836208A (en) * | 2014-02-11 | 2015-08-12 | 快捷半导体(苏州)有限公司 | Protection circuit for a standard connector adapter and protection method thereof |
| CN106796262A (en) * | 2014-09-23 | 2017-05-31 | 戴乐格半导体公司 | USB data pin impedance detection |
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| JP2008098077A (en) * | 2006-10-16 | 2008-04-24 | Matsushita Electric Ind Co Ltd | Connector terminal |
| CN101951421A (en) * | 2010-09-20 | 2011-01-19 | 深圳桑菲消费通信有限公司 | Expansion use method for cell phone earphone interface |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554240A (en) * | 2019-09-09 | 2019-12-10 | Oppo（重庆）智能科技有限公司 | Impedance detection circuit and method for charging interface and terminal equipment |
| CN111142058A (en) * | 2020-01-02 | 2020-05-12 | 联芸科技（杭州）有限公司 | Resistance detection device and method |
| CN111142058B (en) * | 2020-01-02 | 2022-05-17 | 联芸科技（杭州）有限公司 | Resistance detection device and method |
| EP3901641A1 (en) * | 2020-04-20 | 2021-10-27 | Delta Electronics (Shanghai) Co., Ltd. | Insulation impedance detection circuit for on-board charger and insulation impedance detection method |
| CN114264863A (en) * | 2022-01-04 | 2022-04-01 | 超旸半导体(上海)有限公司 | Current limiting value detection method and detection device for DC/DC converter |
| CN114264863B (en) * | 2022-01-04 | 2023-08-22 | 超旸半导体(上海)有限公司 | Current limiting value detection method and detection device for DC/DC converter |
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Application publication date: 20170308 |