CN104882925A - Electronic device and driving circuit of charging indicating lamp of electronic device - Google Patents
Electronic device and driving circuit of charging indicating lamp of electronic device Download PDFInfo
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- CN104882925A CN104882925A CN201510236701.XA CN201510236701A CN104882925A CN 104882925 A CN104882925 A CN 104882925A CN 201510236701 A CN201510236701 A CN 201510236701A CN 104882925 A CN104882925 A CN 104882925A
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- switch
- indicator light
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- charging inlet
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Abstract
The invention discloses an electronic device and a driving circuit of a charging indicating lamp of the electronic device. The driving circuit includes an indicating lamp, a control circuit, and a first switch. The indicating lamp is connected between a charging port of the electronic device and the ground in series. The first switch is connected to a first branch circuit, consisting of the charging port, the indicating lamp, and the ground, in series. When the voltage of a battery in the electronic device is lower than a preset voltage, the control circuit outputs a first electrical level to control the first switch to be connected when the charging port is accessed to a charging power supply, and the first branch circuit is switched on to enable the indicating lamp to be lightened. By the above means, a charging state of the electronic device is effectively indicated, so that the problem that a user takes the electronic device to be halted or failed as a mistake is avoided.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of electronic equipment and charging indicator light drive circuit thereof.
Background technology
Electronic equipment is mobile phone, panel computer etc. such as, is usually all provided with charging indicator light, for pointing out the charged state of electronic equipment.In existing drive circuit of indicator, the cell voltage of electronic equipment is normally utilized to provide the driving voltage system power supply of electronic equipment (or by) to indicator light.As shown in Figure 1, the positive pole of indicator light LED1, LED2 connects the voltage output end of battery, and minus earth, between the negative pole that current source 1,2 is connected to indicator light LED1, LED2 and ground, for controlling the break-make of indicator light LED1, LED2 place branch road.Namely, when the battery of electronic equipment is in charged state, the Systematical control current source 1,2 of electronic equipment works, thus the branch road that current source 1,2 controls indicator light LED1, LED2 place forms path, and then it is shinny to control indicator light LED1, LED2, plays suggesting effect.
But, when the battery of electronic equipment is in low-pressure state, during cut-in voltage such as lower than system, system cannot be opened, therefore uncontrollable current source work, thus uncontrollable indicator light LED1, LED2 are shinny when charging to battery, thus cannot point out the charged state of battery, likely causing user to take for is that electronic equipment crashes or fault.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of electronic equipment and charging indicator light drive circuit thereof, can effectively indicate the charged state of electronic equipment, avoids that user occurs and takes for the problems such as electronic equipment deadlock or fault.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: the charging indicator light drive circuit providing a kind of electronic equipment, comprises indicator light, control circuit and the first switch; Described indicator light is serially connected between the charging inlet of electronic equipment and ground, described first switch series is connected in the first branch road be made up of described charging inlet, described indicator light and ground, the first level is exported lower than control circuit described during predetermined voltage at the cell voltage of described electronic equipment, to control described first switch conduction when described charging inlet accesses charge power supply, with the first branch road described in conducting, make described indicator light shinny.
Wherein, described control circuit comprises second switch, one end of described first switch connects the negative pole of described indicator light, the other end ground connection of described first switch, one end of described second switch connects the control end of described first switch and described charging inlet respectively, the other end ground connection of described second switch, the control end of described second switch connects the GPIO mouth of the baseband chip of described electronic equipment; When the cell voltage of described electronic equipment is lower than predetermined voltage, the GPIO mouth of described baseband chip exports the control end of the first control level to described second switch to control second switch disconnection, to make described second switch export the control end of described first level to described first switch when described charging inlet accesses charge power supply, and then control described first switch conduction.
Wherein, described first switch is NMOS field effect transistor, described second switch is the triode of NPN type, the drain electrode of described NMOS field effect transistor connects the negative pole of described indicator light, the source ground of described NMOS field effect transistor, the collector electrode of described triode connects the grid of described NMOS field effect transistor and described charging inlet, the grounded emitter of described triode respectively, and the base stage of described triode connects the GPIO mouth of described baseband chip; When the cell voltage of described electronic equipment is lower than predetermined voltage, the GPIO mouth output low level of described baseband chip disconnects to the base stage of described triode to control described triode, the grid of high level to described NMOS field effect transistor is exported, to control the conducting of described NMOS field effect transistor to make the collector electrode of described triode when described charging inlet accesses charge power supply.
Wherein, described control circuit also comprises the first resistance, and described first resistance is serially connected between the collector electrode of described triode and described charging inlet.
Wherein, described control circuit also comprises the second resistance, and one end of described second resistance connects the base stage of described triode, the other end ground connection of described second resistance.
Wherein, described drive circuit also comprises the 3rd resistance, and described 3rd resistance is serially connected between the positive pole of described charging inlet and described indicator light.
Wherein, described drive circuit also comprises diode, and described diode is serially connected between the positive pole of described charging inlet and described indicator light, and the positive pole of described diode connects described charging inlet.
Wherein, the positive pole of described indicator light also connects the voltage output end of the battery of described electronic equipment, and the negative pole of described indicator light is also by the current source ground connection of described electronic equipment; When the cell voltage of described electronic equipment is equal to or higher than described predetermined voltage, described control circuit exports second electrical level, disconnect to control described first switch, to disconnect described first branch road, and when the charging inlet access charge power supply of described electronic equipment, described current source controls the second branch road conducting be made up of the voltage output end of described battery, indicator light and ground, to make described indicator light shinny.
For solving the problems of the technologies described above, another technical solution used in the present invention is: provide a kind of electronic equipment, comprises the charging indicator light drive circuit as aforementioned any one.
The invention has the beneficial effects as follows: the situation being different from prior art, in charging indicator light drive circuit of the present invention, first switch series is connected on by charging inlet, in the first branch road that indicator light and ground are formed, the first level is exported lower than control circuit during predetermined voltage at the cell voltage of electronic equipment, to control the first switch conduction when charging inlet accesses charge power supply, with conducting first branch road, and then make indicator light shinny, thus when cell voltage is in lower state, still indicator light can be controlled shinny when charging to electronic equipment, and then play charging indicative function, thus generation user can be avoided to take for the problems such as electronic equipment crashes or breaks down, be conducive to improving Consumer's Experience.
Accompanying drawing explanation
Fig. 1 is the drive circuit figure of the charging indicator light of a kind of electronic equipment of prior art;
Fig. 2 is the structural representation of charging indicator light drive circuit one execution mode of electronic equipment of the present invention;
Fig. 3 is the specific implementation circuit diagram of charging indicator light drive circuit one execution mode of electronic equipment of the present invention;
Fig. 4 is the specific implementation circuit diagram of another execution mode of charging indicator light drive circuit of electronic equipment of the present invention.
Embodiment
Below in conjunction with drawings and embodiments, the present invention is described in detail.
Consult 2, in charging indicator light drive circuit one execution mode of electronic equipment of the present invention, drive circuit comprises indicator light 21, control circuit 22 and the first switch 23.Wherein, the first switch 23 is trifocal control switch.Indicator light 21 is LED, and its positive pole is connected with the charging inlet 20 of electronic equipment, minus earth.In addition, first switch 23 is serially connected in the first branch road be made up of charging inlet 20, indicator light 21 and ground, namely one end of the first switch 23 connects the negative pole of indicator light 21, and the other end ground connection of the first switch 23, the negative pole of indicator light 21 is connected to ground by the first switch 23.Control circuit 22 connects the control end of the first switch 23.
Wherein, when the cell voltage of electronic equipment is lower than predetermined voltage, control circuit 22 exports the control end of the first level to the first switch 23, to control the first switch 23 conducting when charging inlet 20 accesses charge power supply, with first branch road at conducting indicator light 21 place, and then make indicator light 21 shinny.
In present embodiment, charging inlet 20 is connected with indicator light 21, thus when the cell voltage of electronic equipment is lower and when causing the system of electronic equipment to open, when charging inlet 20 accesses charge power supply to charge to electronic equipment, charge power supply can be utilized to provide driving voltage to indicator light 21, and then make indicator light 21 shinny, thus can effectively indicate charged state, avoid that user occurs and think the problems such as electronic equipment deadlock or fault by mistake, promote Consumer's Experience.
Wherein, electronic equipment can be mobile phone, panel computer etc.
Consult Fig. 3, Fig. 3 is the physical circuit figure of charging indicator light drive circuit of the present invention.As shown in Figure 3, control circuit 22 comprises second switch 24, and wherein second switch 24 is the triode of NPN type.First switch 23 is NMOS (N-type field effect) field effect transistor pipe.For ease of illustrating, will be described with triode 24, NMOS field effect transistor 23 below.
One end of second switch corresponds to the collector electrode c of triode 24, and the other end of second switch corresponds to the emitter e of triode 24, and the control end of second switch corresponds to the base stage b of triode 24.One end of first switch corresponds to the drain electrode d of NMOS field effect transistor 23, and the other end of the first switch corresponds to the source electrode s of NMOS field effect transistor 23, and the control end of the first switch corresponds to the grid d of NMOS field effect transistor 23.
Drive circuit also comprises the first resistance R11, the second resistance R12, the 3rd resistance R13 and the first diode D1.
Wherein, the first resistance R11 is serially connected between the collector electrode c of charging inlet 20 and triode 24.The base stage of triode 24 connects the GPIO mouth 25 of the baseband chip of electronic equipment, the emitter e ground connection of triode 24.The grid g of NMOS field effect transistor 23 is connected between the collector electrode c of triode 24 and the first resistance R11, and the drain electrode d of NMOS field effect transistor 23 connects the negative pole of indicator light 21, the source electrode s ground connection of NMOS field effect transistor 23.The base stage b of one end connecting triode 24 of the second resistance R12, other end ground connection.The positive pole of the first diode D1 connects charging inlet 20, and negative pole connects one end of the 3rd resistance R13, and the other end of the 3rd resistance R13 connects the positive pole of indicator light 21.
Wherein, form the first branch road by charging inlet, the first diode D1, the 3rd resistance R13, indicator light 21 and ground, and between the negative pole that the drain electrode d of NMOS field effect transistor 23 and source electrode s is serially connected in indicator light 21 and ground.First diode D1 plays the effect of protective circuit, and the first resistance R11 and the 3rd resistance R13 plays the effect of dividing potential drop.Second resistance R12 is base stage pull-down bias resistance, can prevent triode 24 from producing misoperation by the impact of noise signal.
In present embodiment, predetermined voltage is the cut-in voltage of the system of electronic equipment.When the cell voltage of electronic equipment is lower than predetermined voltage, system is not opened, first control level of GPIO mouth 25 output low level of baseband chip is to the base stage b of triode 24, triode 24 is made to be in off-state, thus when charging inlet 20 accesses charge power supply, under the effect of charge power supply, make the collector electrode c place of triode 24 export high level (i.e. the first level), to the grid of NMOS field effect transistor 23, with the conducting of control NMOS field effect transistor 23, and then first branch road at conducting indicator light 21 place, thus, under the effect of the voltage provided in charge power supply, make indicator light 21 shinny, play charging indicative function.
When charging inlet 20 does not access charge power supply, the collector electrode c place output low level of triode 24, namely the grid g of NMOS field effect transistor 23 is low level, and therefore NMOS field effect transistor 23 disconnects, thus disconnects the first branch road, and indicator light 21 is not shinny.
Therefore, present embodiment, when the cell voltage of electronic equipment is lower than predetermined voltage, is utilize charging voltage to drive indicator light 21 shinny, reaches the effect of instruction.
It will be understood by those skilled in the art that, second switch can also be PNP type triode or by the equivalent switching transistor of the combination of multiple triode, and the GPIO mouth of baseband chip now can be made can to export corresponding control level according to different switching transistors.
Wherein, when the cell voltage of electronic equipment is greater than or equal to predetermined voltage, provide driving voltage shinny to control indicator light 21 by battery or system to indicator light 21.Furthermore, when the cell voltage of electronic equipment is greater than or equal to predetermined voltage, system is in opening, GPIO mouth 25 output of baseband chip is the base stage of the second control level to triode 24 of high level, triode 24 is made to be in conducting state, thus when charging inlet 20 accesses charge power supply, make charge power supply by the direct ground connection of R11 due to the conducting of triode 24, therefore the grid of collector electrode c place output low level (i.e. second electrical level) to NMOS field effect transistor 23 of triode 24 is made, disconnect with control NMOS field effect transistor 23, first branch road at indicator light 21 place is disconnected.Therefore, in the case, indicator light 21 can't help charge power supply drive.When charging inlet 20 accesses charge power supply to charge to the battery of electronic equipment, because cell voltage is equal to or higher than predetermined voltage, system is opened, therefore shinny by Systematical control indicator light 21.
Particularly, drive circuit also comprises the second diode D2.The positive pole of indicator light 21 is connected with the negative pole of the second diode D2, and the positive pole of the second diode D2 is connected with the voltage output end of the battery of electronic equipment.The negative pole of indicator light 21 passes through the current source 26 ground connection (not shown) of electronic equipment.The second branch road is formed by the voltage output end of battery, the second diode D2, indicator light 21 and ground.When the cell voltage of electronic equipment is equal to or higher than predetermined voltage, system is opened.When charging inlet 20 accesses charge power supply, Systematical control current source 26 works, and to make current source 26 control the second branch road conducting, namely forms path, thus makes indicator light 21 shinny, play suggesting effect thus.
Certainly, in other embodiments, when the cell voltage of electronic equipment is equal to or higher than predetermined voltage, also can controls the first branch road and be in conducting state and continue when charging inlet 20 accesses charge power supply to drive indicator light 21 shinny by charge power supply, to play indicative function.
Consult Fig. 4, in another execution mode of charging indicator light drive circuit of the present invention, the first switch 43 is PMOS field effect transistor, and control circuit 42 is the GPIO mouth of the baseband chip of electronic equipment.For convenience of explanation, below will be described with PMOS field effect transistor 43 and GPIO mouth 42.
As shown in Figure 4, the drain electrode of PMOS field effect transistor 43 connects the negative pole of indicator light 41, and the source ground of PMOS field effect transistor 43, the grid g of PMOS field effect transistor 43 directly connects GPIO mouth 42.When the cell voltage of electronic equipment is lower than predetermined voltage, system is not opened, GPIO mouth 42 output low level of baseband chip is to the grid g of PMOS field effect transistor 43, with the conducting of control PMOS field effect transistor 43, and then conducting is by charging inlet 20, first diode D1, the 3rd resistance R13, indicator light 21 and the first branch road of forming of ground, thus, under the effect of the voltage provided in charge power supply, make indicator light 21 shinny, play charging indicative function.
When cell voltage is equal to or higher than predetermined voltage, system is opened, and GPIO mouth 42 exports the grid g of high level to PMOS field effect transistor 43, disconnects with control PMOS field effect transistor 43, thus disconnects the first branch road, and indicator light 21 is not shinny.Now, when charging inlet 20 accesses charge power supply, Systematical control current source 26 works, and current source 26 controls the second branch road formation path at indicator light 21 place thus, therefore makes indicator light 21 shinny, plays charging indicative function.
By charging indicator light drive circuit of the present invention, effectively can indicate charged state, avoid takeing for the problems such as electronic equipment deadlock or fault.
The present invention also provides a kind of electronic equipment, comprises the charging indicator light drive circuit as described in aforementioned arbitrary execution mode.
The foregoing is only embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (9)
1. a charging indicator light drive circuit for electronic equipment, is characterized in that, comprise indicator light,
Control circuit and the first switch;
Described indicator light is serially connected between the charging inlet of electronic equipment and ground, described first switch series is connected in the first branch road be made up of described charging inlet, described indicator light and ground, the first level is exported lower than control circuit described during predetermined voltage at the cell voltage of described electronic equipment, to control described first switch conduction when described charging inlet accesses charge power supply, with the first branch road described in conducting, make described indicator light shinny.
2. drive circuit according to claim 1, is characterized in that,
Described control circuit comprises second switch, one end of described first switch connects the negative pole of described indicator light, the other end ground connection of described first switch, one end of described second switch connects the control end of described first switch and described charging inlet respectively, the other end ground connection of described second switch, the control end of described second switch connects the GPIO mouth of the baseband chip of described electronic equipment;
When the cell voltage of described electronic equipment is lower than predetermined voltage, the GPIO mouth of described baseband chip exports the control end of the first control level to described second switch to control second switch disconnection, to make described second switch export the control end of described first level to described first switch when described charging inlet accesses charge power supply, and then control described first switch conduction.
3. drive circuit according to claim 2, is characterized in that,
Described first switch is NMOS field effect transistor, described second switch is the triode of NPN type, the drain electrode of described NMOS field effect transistor connects the negative pole of described indicator light, the source ground of described NMOS field effect transistor, the collector electrode of described triode connects the grid of described NMOS field effect transistor and described charging inlet respectively, the grounded emitter of described triode, the base stage of described triode connects the GPIO mouth of described baseband chip;
When the cell voltage of described electronic equipment is lower than predetermined voltage, the GPIO mouth output low level of described baseband chip disconnects to the base stage of described triode to control described triode, the grid of high level to described NMOS field effect transistor is exported, to control the conducting of described NMOS field effect transistor to make the collector electrode of described triode when described charging inlet accesses charge power supply.
4. drive circuit according to claim 3, is characterized in that,
Described control circuit also comprises the first resistance, and described first resistance is serially connected between the collector electrode of described triode and described charging inlet.
5. drive circuit according to claim 3, is characterized in that,
Described control circuit also comprises the second resistance, and one end of described second resistance connects the base stage of described triode, the other end ground connection of described second resistance.
6. drive circuit according to claim 3, is characterized in that,
Described drive circuit also comprises the 3rd resistance, and described 3rd resistance is serially connected between the positive pole of described charging inlet and described indicator light.
7. drive circuit according to claim 3, is characterized in that,
Described drive circuit also comprises diode, and described diode is serially connected between the positive pole of described charging inlet and described indicator light, and the positive pole of described diode connects described charging inlet.
8. drive circuit according to claim 1, is characterized in that,
The positive pole of described indicator light also connects the voltage output end of the battery of described electronic equipment, and the negative pole of described indicator light is also by the current source ground connection of described electronic equipment;
When the cell voltage of described electronic equipment is equal to or higher than described predetermined voltage, described control circuit exports second electrical level, disconnect to control described first switch, to disconnect described first branch road, and when the charging inlet access charge power supply of described electronic equipment, described current source controls the second branch road conducting be made up of the voltage output end of described battery, indicator light and ground, to make described indicator light shinny.
9. an electronic equipment, is characterized in that, comprises the charging indicator light drive circuit as described in any one of claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510236701.XA CN104882925A (en) | 2015-05-11 | 2015-05-11 | Electronic device and driving circuit of charging indicating lamp of electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510236701.XA CN104882925A (en) | 2015-05-11 | 2015-05-11 | Electronic device and driving circuit of charging indicating lamp of electronic device |
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| Publication Number | Publication Date |
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| CN104882925A true CN104882925A (en) | 2015-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510236701.XA Pending CN104882925A (en) | 2015-05-11 | 2015-05-11 | Electronic device and driving circuit of charging indicating lamp of electronic device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182028A (en) * | 2015-10-13 | 2015-12-23 | 国家电网公司 | Residential user distribution box having voltage deviation indication function |
| CN107968447A (en) * | 2017-04-12 | 2018-04-27 | 上海影创信息科技有限公司 | Smart machine low battery charging indicator light switching circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0252309B1 (en) * | 1986-07-09 | 1991-05-15 | Braun Aktiengesellschaft | Monitoring the state of the discharge of a battery |
| CN101877495A (en) * | 2009-04-30 | 2010-11-03 | 深圳富泰宏精密工业有限公司 | Charging indication circuit and portable electronic device applying same |
-
2015
- 2015-05-11 CN CN201510236701.XA patent/CN104882925A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0252309B1 (en) * | 1986-07-09 | 1991-05-15 | Braun Aktiengesellschaft | Monitoring the state of the discharge of a battery |
| CN101877495A (en) * | 2009-04-30 | 2010-11-03 | 深圳富泰宏精密工业有限公司 | Charging indication circuit and portable electronic device applying same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182028A (en) * | 2015-10-13 | 2015-12-23 | 国家电网公司 | Residential user distribution box having voltage deviation indication function |
| CN107968447A (en) * | 2017-04-12 | 2018-04-27 | 上海影创信息科技有限公司 | Smart machine low battery charging indicator light switching circuit |
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Effective date of abandoning: 20190326 |