CN207215948U - A kind of USB load detecting circuits - Google Patents
A kind of USB load detecting circuits Download PDFInfo
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- CN207215948U CN207215948U CN201721199394.3U CN201721199394U CN207215948U CN 207215948 U CN207215948 U CN 207215948U CN 201721199394 U CN201721199394 U CN 201721199394U CN 207215948 U CN207215948 U CN 207215948U
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Abstract
The utility model discloses a kind of USB load detecting circuits, including：USB port, the USB port include power output end USB+ and USB；Output control circuit, the output control circuit are connected with the USB port, and by detecting the state of USB port access load, control the cut-off or conducting of output control circuit；Single chip circuit, the single chip circuit are connected with the USB port, output control circuit.The utility model can overcome the defects of USB does not detect loading functional in the prior art, realize the function of USB detection loads, when only connecting load, USB can be just powered, and reduce electric energy loss, and the circuit is simple and reliable, and production cost is low.
Description
Technical field
It the utility model is related to USB load detectings field, more particularly to a kind of USB load detecting circuits.
Background technology
USB interface has the advantages that easy to use, independently-powered, using flexible, cost are low and small power consumption enjoys favor, quilt
It is widely used in PC peripheral hardwares and portable system.USB interface transmission speed is fast, reliability is high and versatile, it wide
It is general to apply the application for having expanded single-chip microcomputer significantly, in data acquisition and control engineering etc., use USB interface and PC
Communication has the incomparable advantage of conventional serial interface.At present, USB power supply have spread over battery charging, AC adapter and its
The application of its power-supplying forms.But either USB power source or other power supplys, charging is incorrect not only to shorten battery life,
And potential safety hazard be present.
In existing USB charging techniques field, existing USB interface is generally without load detecting function, when not loading
When, USB charging modules continue electricity output, and unnecessary electric energy loss, therefore, ability can be so caused to system
A domain professional and technical personnel problem in the urgent need to address is exactly, how a kind of creative circuit for detecting load of proposition,
Electricity output can be judged whether to, to save the energy according to the loading condition of charging circuit.
Utility model content
The utility model embodiment technical problem to be solved is：A kind of USB load detecting circuits are provided, with solution
Certainly problems of the prior art.
According to the one side of the utility model embodiment, there is provided a kind of USB load detecting circuits, including：
USB port, the USB port include power output end USB+ and USB-；
Output control circuit, the output control circuit are connected with the USB port, and are accessed by detecting USB port
The state of load, control the cut-off or conducting of output control circuit；
Single chip circuit, the single chip circuit are connected with the USB port, output control circuit.
In another embodiment based on the above-mentioned USB load detecting circuits of the utility model, the output control circuit is
The integrated BLM8205 chips of two NMOS tubes.
In another embodiment based on the above-mentioned USB load detecting circuits of the utility model, the single chip circuit includes：
Single-chip microcomputer, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, diode D1；
The single-chip microcomputer includes tri- control ports of A, B, C, and the control port A is to input control port, the control
Port B, C are output control port；
Wherein, the control port A is grounded by diode D1, by connecting input electricity after series resistance R2, resistance R3
Source VCC；The control port B is connected by resistance R5 with the output control circuit, is followed by by series resistance R4, resistance R5
Ground；The control port C is grounded by resistance R1, is connected with the power output end USB+ of USB port.
In another embodiment based on the above-mentioned USB load detecting circuits of the utility model, the BLM8205 chips include
6 pins, respectively pin S1, pin S2, pin G1, pin G2, pin D1, pin D2;
The pin S1, pin S2 are grounded；
The pin G1, pin G2 are connected with the single chip circuit；
The pin D1, pin D2 are connected with the power output end USB- of the USB port.
Compared with prior art, the utility model includes advantages below：
The utility model can overcome the defects of USB does not detect loading functional in the prior art, realize USB detection loads
Function, when only connecting load, USB can be just powered, and reduce electric energy loss, and the circuit is simple and reliable, is produced into
This is low.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used in description of the prior art does one and simply introduced, it should be apparent that, drawings in the following description are this realities
With some new embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the circuit diagram of one embodiment of USB load detecting circuits of the present utility model；
In figure：1 USB port, 2 output control circuits, 3 single chip circuits.
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the embodiment of the utility model is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model part of the embodiment, rather than whole embodiments.Based on the reality in the utility model
Example is applied, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, is all belonged to
In the scope of the utility model protection.
A kind of USB load detecting circuits provided by the utility model are carried out in more detail with reference to the accompanying drawings and examples
Explanation.
Fig. 1 is the circuit diagram of one embodiment of USB load detecting circuits of the present utility model, as shown in figure 1, the implementation
The USB load detecting circuits of example include：
USB port 1, the USB port 1 include power output end USB+ and USB-；
Output control circuit 2, the output control circuit 2 are connected with the USB port 1, and by detecting USB port 1
The state of load is accessed, controls the cut-off or conducting of output control circuit 2；
Single chip circuit 3, the single chip circuit 3 are connected with the USB port 1, output control circuit 2.
The output control circuit 2 is the integrated BLM8205 chips of two NMOS tubes, and BLM8205 chips have less
Conducting resistance, it disclosure satisfy that the demand for reducing power consumption.
The single chip circuit 3 includes：
Single-chip microcomputer, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, diode D1；
The single-chip microcomputer includes tri- control ports of A, B, C, and the control port A is to input control port, the control
Port B, C are output control port；
Wherein, the control port A is grounded by diode D1, by connecting input electricity after series resistance R2, resistance R3
Source VCC；The control port B is connected by resistance R5 with the output control circuit, is followed by by series resistance R4, resistance R5
Ground；The control port C is grounded by resistance R1, is connected with the power output end USB+ of USB port.
The BLM8205 chips include 6 pins, respectively pin S1, pin S2, pin G1, pin G2, pin D1,
Pin D2;
The pin S1, pin S2 are grounded；
The pin G1, pin G2 are connected with the single chip circuit 3；
The pin D1, pin D2 are connected with the power output end USB- of the USB port 1.
Under initialization condition, the control port B output levels of single chip circuit 3 are set to low level, then output control
Circuit 2 is cut-off state, and when USB port 1 does not connect load, power output end USB+ and power output end USB- are in and disconnected
State, now power output end USB+ level is low, and power output end USB- is then pulled upward to high level by VCC, passes through control
Port A exports high level signal to single-chip microcomputer；When USB port 1 connects load, resistance R3, resistance R1 and USB port load into
Row partial pressure, because the voltage that USB port load and resistance R1 divide is very low, now power output end USB- is low level, is passed through
Control port A exports low level signal to single-chip microcomputer, single-chip microcomputer and turns on output control by the way that control port B is set into high level
Circuit 2, and input positive supply to USB port in control port C；When single chip circuit 3 detects the threshold value that electric current as low as sets
When, then close USB port 1 exports power supply and control port B output signal.
A kind of USB load detecting circuits provided by the utility model are described in detail above, it is used herein
Specific case is set forth to principle of the present utility model and embodiment, and the explanation of above example is only intended to help
Understand method and its core concept of the present utility model；Meanwhile for those of ordinary skill in the art, according to the utility model
Thought, there will be changes in specific embodiments and applications, in summary, this specification content should not be understood
For to limitation of the present utility model.
Finally it should be noted that：Preferred embodiment of the present utility model is the foregoing is only, is not limited to this
Utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art
For, it can still modify to the technical scheme described in foregoing embodiments, or to which part technical characteristic
Progress equivalent substitution, all within the spirit and principles of the utility model, any modification, equivalent substitution and improvements made etc.,
It should be included within the scope of protection of the utility model.
Claims (4)
- A kind of 1. USB load detecting circuits, it is characterised in that including：USB port, the USB port include power output end USB+ and USB-；Output control circuit, the output control circuit are connected with the USB port, and by detecting USB port access load State, control the cut-off or conducting of output control circuit；Single chip circuit, the single chip circuit are connected with the USB port, output control circuit.
- 2. circuit according to claim 1, it is characterised in that the output control circuit is that two NMOS tubes are integrated BLM8205 chips.
- 3. circuit according to claim 1, it is characterised in that the single chip circuit includes：Single-chip microcomputer, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, diode D1；The single-chip microcomputer includes tri- control ports of A, B, C, and the control port A is to input control port, the control port B, C is output control port；Wherein, the control port A is grounded by diode D1, by connecting input power after series resistance R2, resistance R3 VCC；The control port B is connected by resistance R5 with the output control circuit, is followed by by series resistance R4, resistance R5 Ground；The control port C is grounded by resistance R1, is connected with the power output end USB+ of USB port.
- 4. circuit according to claim 2, it is characterised in that the BLM8205 chips include 6 pins, respectively draw Pin S1, pin S2, pin G1, pin G2, pin D1, pin D2;The pin S1, pin S2 are grounded；The pin G1, pin G2 are connected with the single chip circuit；The pin D1, pin D2 are connected with the power output end USB- of the USB port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721199394.3U CN207215948U (en) | 2017-09-19 | 2017-09-19 | A kind of USB load detecting circuits |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721199394.3U CN207215948U (en) | 2017-09-19 | 2017-09-19 | A kind of USB load detecting circuits |
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| Publication Number | Publication Date |
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| CN207215948U true CN207215948U (en) | 2018-04-10 |
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| CN201721199394.3U Active CN207215948U (en) | 2017-09-19 | 2017-09-19 | A kind of USB load detecting circuits |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478948A (en) * | 2017-09-19 | 2017-12-15 | 东莞博力威电池有限公司 | A kind of USB load detecting circuits and detection method |
-
2017
- 2017-09-19 CN CN201721199394.3U patent/CN207215948U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478948A (en) * | 2017-09-19 | 2017-12-15 | 东莞博力威电池有限公司 | A kind of USB load detecting circuits and detection method |
| CN107478948B (en) * | 2017-09-19 | 2023-11-10 | 广东博力威科技股份有限公司 | USB load detection circuit and detection method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 523000 Tongsha New Industrial Park, Dongcheng Street, Dongguan City, Guangdong Province Patentee after: Guangdong Boliwei Technology Co., Ltd. Address before: 523000 new industrial zone, Dongcheng District, Guangdong, Dongguan Patentee before: DongGuan Greenway Battery Co., Ltd. |
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| CP03 | Change of name, title or address |