CN207010345U - USB power source and the circuit of battery automatic switchover power supply - Google Patents
USB power source and the circuit of battery automatic switchover power supply Download PDFInfo
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- CN207010345U CN207010345U CN201720689258.6U CN201720689258U CN207010345U CN 207010345 U CN207010345 U CN 207010345U CN 201720689258 U CN201720689258 U CN 201720689258U CN 207010345 U CN207010345 U CN 207010345U
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Abstract
Automatically switch the circuit powered the utility model discloses a kind of USB power source and battery, belongs to medical instruments field, the circuit comprises at least the first output end, the second output end, metal-oxide-semiconductor and diode；The drain electrode of metal-oxide-semiconductor is the first output end, the load of connection first；The source electrode of metal-oxide-semiconductor connects the first diode, and the first diode connects the grid of metal-oxide-semiconductor；The common port connection battery of the source electrode of second diode and metal-oxide-semiconductor；The common port of second diode and the 3rd diode is the second output end, the load of connection second；3rd diode connects USB power source by USB interface；Solve after power supply is switched into USB power source, USB power source is the problem of electronic equipment bulk supply can not cut off battery powered；Reach and power supply is switched into USB power source automatically after USB power source is accessed and cuts off battery powered, increased the working condition of electronic equipment, improved the effect of the service life of battery.
Description
Technical field
The utility model embodiment is related to medical instruments field, and more particularly to a kind of USB power source automatically switches with battery to be supplied
The circuit of electricity.
Background technology
Increasingly carried with the volume of portable low power-consumption medical treatment electronic equipment to miniaturization, medical treatment electronic equipment
Battery capacity can be influenceed by battery volume, in general medical treatment electronic equipment has a variety of power supply modes, such as battery mostly
The external power source power supply such as power supply or USB (Universal Serial Bus, USB) interface.
When there is external power source, it is whole medical treatment electronic equipment that external power source is typically chosen in existing power supply selection mode
Power supply, it is impossible to be only some parts power supply in the medical treatment electronic equipment using external power source.In some application scenarios, when having
When external power source is powered, the power supply of battery is not only cut off, while external power source is only powered to some funtion parts.
Utility model content
In order to solve problem of the prior art, the utility model embodiment provides a kind of USB power source and cut automatically with battery
Change the circuit of power supply.The technical scheme is as follows：
First aspect, there is provided a kind of USB power source and the circuit of battery automatic switchover power supply, the circuit comprise at least first
Output end, the second output end, metal-oxide semiconductor (MOS) metal-oxide-semiconductor and diode；
The drain electrode of the metal-oxide-semiconductor is the first output end, the load of the first output end connection first；
The source electrode of the metal-oxide-semiconductor connects the positive pole of the first diode, and the negative pole of first diode connects the metal-oxide-semiconductor
Grid；
The source electrode of the metal-oxide-semiconductor connects the positive pole of the second diode, positive pole and the metal-oxide-semiconductor of second diode
The common port connection battery of source electrode；
The negative pole of second diode is connected with the negative pole of the 3rd diode, second diode and the 3rd diode
Common port be the second output end, the load of the second output end connection second；
The positive pole of 3rd diode connects USB power source by USB interface；
The positive pole of 3rd diode connects the positive pole of the 4th diode, the negative pole of the 4th diode with it is described
The grid connection of metal-oxide-semiconductor.
Optionally, it is connected with first resistor between the negative pole of the 4th diode and the grid of the metal-oxide-semiconductor；
4th diode and the common port of the first resistor are grounded by second resistance.
The beneficial effect brought of technical scheme that the utility model embodiment provides is：
The automatically switch circuit of power supply of the USB power source and battery includes two output ends, metal-oxide-semiconductor, diodes, by metal-oxide-semiconductor,
Diode is connected with battery or USB power source, and USB power source and battery automatic switchover power supply, electricity are realized using the on state characteristic of metal-oxide-semiconductor
Loaded when pond powers for first and the second load supplying, USB power source are the second load supplying when powering；Solves correlation technique
In, after power supply is switched into USB power source, USB power source is electronic equipment bulk supply, it is impossible to cuts off battery powered ask
Topic；Reach and power supply is switched into USB power source automatically after USB power source is accessed, and cut off battery powered, used USB electricity
Source powers for a part for electronic equipment, increases the working condition of electronic equipment, improves the effect of the service life of battery.
Brief description of the drawings
, below will be to needed for embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
The accompanying drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some realities of the present utility model
Example is applied, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is a kind of USB power source and the electricity of the circuit of battery automatic switchover power supply according to an exemplary embodiment
Lu Tu.
Embodiment
It is new to this practicality below in conjunction with accompanying drawing to make the purpose of this utility model, technical scheme and advantage clearer
Type embodiment is described in further detail.
Refer to Fig. 1, it illustrates the utility model one embodiment provide USB (Universal Serial Bus,
USB) power supply and battery automatically switch power supply circuit structured flowchart.
As shown in figure 1, the USB power source and battery automatically switch, the circuit of power supply comprises at least the first output end, second defeated
Go out end, MOS (metal-oxide-semiconductor, Metal-oxide-semicondutor) pipes and diode.
Metal-oxide-semiconductor Q1 drain D is the first output end, and the first output end connection first loads RL1.
Optionally, metal-oxide-semiconductor is P-channel metal-oxide-semiconductor.
Metal-oxide-semiconductor Q1 source S connects the first diode D1 positive pole, the first diode D1 negative pole connection metal-oxide-semiconductor Q1's
Grid G.
Optionally, the first diode D1 positive pole is connected after being connected with resistance R1 with metal-oxide-semiconductor Q1 source electrode.
The voltage that USB power source provides after the USB power source that first diode D1 can avoid accesses pours in down a chimney to battery, avoids producing
Potential safety hazard.
Metal-oxide-semiconductor Q1 source S connects the second diode D2 positive pole, the second diode D2 positive pole and metal-oxide-semiconductor Q1 source
Pole S common port connection battery VBat.
Optionally, battery is a section AAA batteries, and the voltage of battery is 1.5V.
Optionally, whether battery VBat accesses circuit and can be realized by switching.
Second diode D3 negative pole is connected with the 3rd diode D3 negative pole, the second diode D2 and the 3rd diode D3
Common port be the second output end, the second load of the second output end connection RL2.
3rd diode D3 positive pole passes through USB interface J2 connection USB power sources Vusb.
When USB power source Vusb does not access circuit, USB interface J2 disconnects；When USB power source Vusb accesses circuit, USB connects
Mouth J2 closures.
Wherein, the voltage of USB power source is higher than the voltage of battery.
It is the first load RL1 and the second load RL2 power supplies by battery VBat when USB power source Vusb does not access circuit；
When USB power source Vusb accesses circuit, because the voltage of USB power source is higher than the voltage of battery, metal-oxide-semiconductor Q1 cut-offs, USB power source Vusb
Only it is the second load supplying.
3rd diode D3 positive pole connects the 4th diode D4 positive pole, the 4th diode D4 negative pole and metal-oxide-semiconductor Q1
Grid G connection.
First resistor R2 is connected between 4th diode D4 negative pole and metal-oxide-semiconductor Q1 grid G；
4th diode D4 and first resistor R2 common port is grounded by second resistance R3.
In an exemplary example, battery VBat is 1.5V in Fig. 1, and USB power source Vusb is 5V, metal-oxide-semiconductor Q1 grid
The threshold values in source is -0.4V, when grid source G voltage difference is -0.4V, metal-oxide-semiconductor Q1 drain-source conducting, if the voltage of source S is
1.5V, the voltage of grid G is 0.5V, then GS=-1V, and metal-oxide-semiconductor Q1 conductings, the voltage of drain D is 1.5V；If the voltage of source S
For 1.5V, the voltage of grid G is 1.8V, GS=-0.3V, then metal-oxide-semiconductor Q1 is not turned on, and the voltage of drain D is 0V.
Because USB power source high level has 5V, battery VBat to be connected to source S, the USB power source Vusb's being connected with grid G
High level can reach more than 1.1V, thus can control metal-oxide-semiconductor Q1 turn off, therefore the circuit can control gate G realize MOS
The switch of pipe.
It should be noted that if the battery VBat in Fig. 1 saves AAA batteries, voltage 1.5V, for conventional MOS for one
Operating voltage is relatively low for pipe, can cause the circuit in the state of running and comparing high power consumption, metal-oxide-semiconductor conducting failure, therefore MOS
Pipe uses low pressure P channel metal-oxide-semiconductor A03415.
In another exemplary example, the USB power source in Fig. 1 is 5V, and resistance R1 resistance is 5k Ω, resistance R2's
Resistance is 10k Ω, and resistance R3 resistance is 100k Ω, and metal-oxide-semiconductor Q1 uses low pressure P channel metal-oxide-semiconductor A03415.
Because the instantaneous maximum power dissipation electric current of system can reach 200mA, according to metal-oxide-semiconductor Q1 characteristic, in VGSMore than 0.9V
When, by more than 1A electric current, fully meet the maximum power dissipation of system requirements, so in regulation circuit resistance R1, resistance R2 and
Resistance R3 resistance, makes VGSEqual to 0.9V.
When USB power source accesses, 5V voltages are added to metal-oxide-semiconductor Q1 grid, VGMore than VS, metal-oxide-semiconductor Q1 cut-offs, battery powered
Failure, automatically switch to USB power source power supply.
In summary, the USB power source that the utility model embodiment provides and the circuit of battery automatic switchover power supply include two
Individual output end, metal-oxide-semiconductor, diode, metal-oxide-semiconductor, diode and battery or USB power source are connected, it is real using the on state characteristic of metal-oxide-semiconductor
Existing USB power source and battery automatically switch power supply, are the first load and the second load supplying during battery powered, when USB power source is powered
For the second load supplying；Solve in correlation technique, after power supply is switched into USB power source, USB power source is that electronic equipment is whole
Body is powered, it is impossible to the problem of cutting off battery powered；Reach and switched to USB electric power supply automatically after USB power source is accessed
Source, and battery powered is cut off, powered using USB power source for a part for electronic equipment, increase the working condition of electronic equipment, carry
The effect of the service life of high battery.
It should be noted that：Above-mentioned the utility model embodiment sequence number is for illustration only, does not represent the quality of embodiment.
Preferred embodiment of the present utility model is the foregoing is only, it is all in this practicality not to limit the utility model
Within new spirit and principle, any modification, equivalent substitution and improvements made etc., guarantor of the present utility model should be included in
Within the scope of shield.
Claims (2)
- The circuit powered 1. a kind of general-purpose serial bus USB power supply automatically switches with battery, it is characterised in that the circuit is at least Including the first output end, the second output end, metal-oxide semiconductor (MOS) metal-oxide-semiconductor and diode；The drain electrode of the metal-oxide-semiconductor is the first output end, the load of the first output end connection first；The source electrode of the metal-oxide-semiconductor connects the positive pole of the first diode, and the negative pole of first diode connects the grid of the metal-oxide-semiconductor Pole；The source electrode of the metal-oxide-semiconductor connects the positive pole of the second diode, the positive pole of second diode and the source electrode of the metal-oxide-semiconductor Common port connection battery；The negative pole of second diode is connected with the negative pole of the 3rd diode, the public affairs of second diode and the 3rd diode End is the second output end altogether, and the second output end connection second loads；The positive pole of 3rd diode connects USB power source by USB interface；The positive pole of 3rd diode connects the positive pole of the 4th diode, negative pole and the metal-oxide-semiconductor of the 4th diode Grid connection.
- 2. circuit according to claim 1, it is characterised in that the negative pole of the 4th diode and the grid of the metal-oxide-semiconductor First resistor is connected between pole；4th diode and the common port of the first resistor are grounded by second resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720689258.6U CN207010345U (en) | 2017-06-14 | 2017-06-14 | USB power source and the circuit of battery automatic switchover power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720689258.6U CN207010345U (en) | 2017-06-14 | 2017-06-14 | USB power source and the circuit of battery automatic switchover power supply |
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| Publication Number | Publication Date |
|---|---|
| CN207010345U true CN207010345U (en) | 2018-02-13 |
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ID=61447603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720689258.6U Active CN207010345U (en) | 2017-06-14 | 2017-06-14 | USB power source and the circuit of battery automatic switchover power supply |
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| CN (1) | CN207010345U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111200302A (en) * | 2018-11-16 | 2020-05-26 | 安凯(广州)微电子技术有限公司 | Circuit for preventing battery from flowing backward to USB |
-
2017
- 2017-06-14 CN CN201720689258.6U patent/CN207010345U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111200302A (en) * | 2018-11-16 | 2020-05-26 | 安凯(广州)微电子技术有限公司 | Circuit for preventing battery from flowing backward to USB |
| CN111200302B (en) * | 2018-11-16 | 2023-03-14 | 安凯(广州)微电子技术有限公司 | Circuit for preventing battery from flowing backwards to USB |
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