CN104159359A - Electric torch drive circuit and mobile terminal - Google Patents
Electric torch drive circuit and mobile terminal Download PDFInfo
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- CN104159359A CN104159359A CN201410302683.6A CN201410302683A CN104159359A CN 104159359 A CN104159359 A CN 104159359A CN 201410302683 A CN201410302683 A CN 201410302683A CN 104159359 A CN104159359 A CN 104159359A
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- pressurizer
- connects
- drive circuit
- resistance unit
- photoflash lamp
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Abstract
The invention discloses an electric torch drive circuit and a mobile terminal, achieving a function of starting an electric torch when the mobile terminal is in a power-off state and a function of starting the electric torch through a button in a power-on state. The electric torch drive circuit comprises a flash lamp, a battery, a control switch and a voltage stabilizer. One end of the flash lamp is connected with a power output end of the voltage stabilizer, and the other end of the flash lamp is grounded. One end of the battery is connected with a power input end of the voltage stabilizer, and the other end of the battery is grounded. One end of the control switch is connected with the battery, and the other end of the control switch is connected with an enablement end of the voltage stabilizer.
Description
Technical field
The present invention relates to terminal equipment field, relate in particular to a kind of drive circuit and mobile terminal of flashlight.
Background technology
All with flashlight, this seems simply but very practical little function current a lot of mobile terminal.In mobile device, realize flashlight function, use that can very convenient user.
In prior art, the flashlight being configured on mobile terminal generally adopts light-emitting diode (LED) as luminescent device, on certain hardware circuit basis, cooperation realizes the operation opening and closing with software control, but conventionally must be at mobile terminal under the state in start or standby, flashlight function just can be opened, and under off-mode, cannot open flashlight function.For this reason, the utility model patent that application number is 201220499657.3 provides a kind of scheme of flashlight function of also can opening under off-mode at mobile phone.As shown in Figure 1, the emergency driving circuit of this mobile phone flashlight comprises that photoflash lamp drives chip, pressurizer, battery of mobile phone, control switch, pressurizer power output end drives chip to be electrically connected to by wire and photoflash lamp, and the power input of pressurizer is electrically connected to battery of mobile phone by wire, wire between pressurizer and battery of mobile phone is provided with control switch, and the Enable Pin of pressurizer is electrically connected to cell phone system voltage.When mobile phone shutdown, cell phone system voltage is low level, and the Enable Pin of pressurizer is effective, by operation-control switch, battery of mobile phone is powered to pressurizer, thereby opens the flashlight function of photoflash lamp.When control switch is opened, battery of mobile phone disconnects power supply, and flashlight function is closed.
Yet this kind of implementation is in mobile phone power-on, cell phone system voltage is high level in the Enable Pin of pressurizer, now the Enable Pin of voltage-stabiliser tube is invalid, and the flashlight function of photoflash lamp is closed, and wants to open, can only open flashlight function by software operation, button is inoperative.In addition, to photoflash lamp, do not drive chip to carry out necessary insulation blocking, when flashlight function is opened, there will be pouring in down a chimney of larger electric current, this may drive chip to cause damage to photoflash lamp.
Summary of the invention
The invention provides a kind of drive circuit and mobile terminal of flashlight, not only at mobile terminal, under off-mode, can open flashlight function, but also can be by the flashlight function that presses switch to open under open state.
The concrete technical scheme that the embodiment of the present invention provides is as follows:
On the one hand, provide a kind of drive circuit of flashlight, having comprised:
Photoflash lamp, battery, control switch, pressurizer, described photoflash lamp one end connects the power output end of described pressurizer, one end ground connection, described battery one end connects the power input of described pressurizer, one end ground connection, described control switch one end connects described battery, and the other end connects the Enable Pin of described pressurizer.
Preferably, described flashlight drive circuit also comprises the first resistance unit, the second resistance unit, and described first resistance unit one end connects described control switch, and one end connects the Enable Pin of described pressurizer, described second resistance unit one end connects described the first resistance unit, one end ground connection.
Preferably, described flashlight drive circuit also comprises and also comprises one first capacitor cell, and described the first capacitor cell two ends connect respectively the two ends of described the second resistance unit.
Preferably, described flashlight drive circuit also comprises a voltage comparator circuit, and described voltage comparator circuit output is connected with the Enable Pin of described pressurizer, and at described cell voltage during lower than reference voltage, output low level signal is to described pressurizer.
Preferably, described voltage comparator circuit comprises voltage comparator, reference voltage source, the output of described voltage comparator connects the Enable Pin of described pressurizer, the normal phase input end of described voltage comparator connects between described the first resistance unit and the second resistance unit, the negative-phase input of described voltage comparator connects described reference voltage source, described reference voltage source other end ground connection.
Preferably, also comprise one the 3rd resistance unit, described the 3rd resistance unit one end connects the output of described voltage comparator, and one end connects described battery.
Preferably, described flashlight drive circuit also comprises that photoflash lamp drives chip, one first diode, the second diode, the positive pole of described the first diode connects described photoflash lamp and drives chip, the negative pole of described the first diode connects described photoflash lamp, described the second diode cathode connects the output of described pressurizer, and negative pole connects described photoflash lamp.
Preferably, also comprise one second capacitor cell, one end of described the second capacitor cell connects described pressurizer, other end ground connection.
On the other hand, provide a kind of mobile terminal that comprises flashlight drive circuit described above.
Based on technique scheme, in the embodiment of the present invention, described photoflash lamp one end connects the power output end of described pressurizer, one end ground connection, described battery one end connects the power input of described pressurizer, one end ground connection, described control switch one end connects described battery, and the other end connects the Enable Pin of described pressurizer.Like this, under mobile terminal off-mode, when control switch is closed, battery is powered to pressurizer, and pressurizer Enable Pin is high level, and pressurizer Enable Pin is effective, stabilizer output voltage is powered to photoflash lamp, thereby drives photoflash lamp luminous, has opened flashlight function, when control switch disconnects, pressurizer Enable Pin is low level, and pressurizer Enable Pin is invalid, and pressurizer can not be powered to photoflash lamp, therefore can not drive photoflash lamp luminous, thereby flashlight function is closed.At mobile terminal under open state, can make pressurizer Enable Pin effective by Closed control switch, power supply, to photoflash lamp, drives photoflash lamp luminous, open flashlight function, also can realize by button the startup of flashlight function under mobile terminal-opening state.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of prior art flashlight drive circuit;
Fig. 2 is the schematic diagram of flashlight drive circuit in the embodiment of the present invention;
Fig. 3 is a kind of concrete schematic diagram of flashlight drive circuit in the embodiment of the present invention;
Fig. 4 is another kind of schematic diagram in the embodiment of the present invention;
Fig. 5 is a kind of concrete schematic diagram of Fig. 4 flashlight drive circuit;
Fig. 6 is a kind of schematic diagram of flashlight drive circuit in the embodiment of the present invention;
Fig. 7 is a kind of concrete circuit diagram of flashlight drive circuit in the embodiment of the present invention.
Embodiment
The embodiment of the present invention provides a kind of flashlight drive circuit and mobile terminal.
Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is elaborated.
In first embodiment of the invention, as shown in Figure 2, provide a kind of flashlight drive circuit, having comprised:
Photoflash lamp 1, battery 2, control switch 3, pressurizer 4, photoflash lamp 1 one end connects the power output end of pressurizer 4, one end ground connection, battery 2 one end connect the power input of pressurizer 4, one end ground connection, and control switch 3 one end connect battery 2, the other end connects the Enable Pin of pressurizer 4, pressurizer 4 one end ground connection.
Based on technique scheme, in the embodiment of the present invention, described photoflash lamp one end connects the power output end of described pressurizer, one end ground connection, described battery one end connects the power input of described pressurizer, one end ground connection, described control switch one end connects described battery, and the other end connects the Enable Pin of described pressurizer.Like this, under mobile terminal off-mode, when control switch is closed, battery is powered to pressurizer, and pressurizer Enable Pin is high level, and pressurizer Enable Pin is effective, stabilizer output voltage is powered to photoflash lamp, thereby drives photoflash lamp luminous, has opened flashlight function, when control switch disconnects, pressurizer Enable Pin is low level, and pressurizer Enable Pin is invalid, pressurizer Non voltage output, therefore can not drive photoflash lamp luminous, thereby flashlight function is closed.At mobile terminal under open state, can make pressurizer Enable Pin effective by Closed control switch, power supply, to photoflash lamp, drives photoflash lamp luminous, open flashlight function, also can realize by button the startup of flashlight function under mobile terminal-opening state.
Preferably, described flashlight drive circuit also comprises the first resistance unit 51, the second resistance unit 52, as shown in Figure 3, first resistance unit 51 one end connect control switch 3, one end connects the Enable Pin of pressurizer 4, and second resistance unit 52 one end connect the first resistance unit 51, one end ground connection.
Wherein, the first resistance unit 51 and the second resistance unit 52 play the effect of dividing potential drop.Its concrete numerical value can be set according to the specifications parameter that enables pin of selected pressurizer.
Preferably, described flashlight drive circuit also comprises one first capacitor cell, and described the first capacitor cell two ends connect respectively the two ends of described the second resistance unit.
Wherein, described the first capacitor cell is for playing the effect of voltage stabilizing to the voltage at the second resistance unit 52 two ends.
Preferably, described flashlight drive circuit also comprises a voltage comparator circuit 6, and as shown in Figure 4, voltage comparator circuit 6 outputs are connected with the Enable Pin of pressurizer 4, and at described cell voltage during lower than reference voltage, output low level signal is to pressurizer 4.
Preferably, voltage comparator circuit 6 comprises voltage comparator 61, reference voltage source 63, as shown in Figure 5, the output of voltage comparator 61 connects the Enable Pin of pressurizer 4, the normal phase input end of voltage comparator 61 connects between the first resistance unit 51 and the second resistance unit 52, the negative-phase input of voltage comparator 61 connects reference voltage source 63, reference voltage source 63 other end ground connection.
Wherein, reference voltage source 63 is selected system voltage, and this voltage still keeps output after mobile terminal shutdown.
Owing to having increased voltage comparator circuit 6, after control switch 3 closures, cell voltage detected in the dividing potential drop at the second resistance unit two ends during lower than reference voltage, Enable Pin with regard to output low level signal to pressurizer 4, make pressurizer 4 Enable Pins in disarmed state, pressurizer 4 is not worked, Non voltage output, photoflash lamp 1 is not luminous, and flashlight function is closed.Like this, battery 2 just can not continue power consumption again, has avoided battery to cross the problem of putting, and has effectively protected battery.
Preferably, also comprise that one the 3rd resistance unit 62, the three resistance unit 62 one end connect the output of voltage comparator 61, one end connects battery 2.
Wherein, the 3rd resistance unit 62 plays pull-up resistor, can select add or do not add according to selected voltage comparator.
Particularly, after control switch 3 closures, the voltage that the reference voltage source 63 of usining is exported is as reference voltage, cell voltage is after the dividing potential drop of the first resistance unit 51, the second resistance unit 52, the voltage difference at the second resistance unit 52 two ends is as the normal phase input end input of voltage comparator 61, the voltage of reference voltage source 63 outputs is that reference voltage is as the negative-phase input input of voltage comparator 61, the voltage difference that is positioned at the second resistance unit 52 two ends as cell voltage after dividing potential drop, lower than reference voltage, is output as low level signal through voltage comparator 61.Low level signal inputs to the Enable Pin of pressurizer 4, and pressurizer 4 Enable Pins are in disarmed state, and now pressurizer 4 is not worked, Non voltage output, and photoflash lamp 1 is not luminous, and flashlight function is closed.Like this, battery 2 just can not continue power consumption again, has avoided battery to cross the problem of putting, and has effectively protected battery.
In addition, after control switch 3 closures, dividing potential drop at cell voltage on the second resistance unit 52 is during higher than reference voltage, voltage comparator 61 output high level signals, pressurizer Enable Pin is high level, pressurizer is in running order, output voltage, power supply is to photoflash lamp 1, and photoflash lamp is luminous, opens flashlight function.Battery is normally used.
Preferably, described flashlight drive circuit also comprises that photoflash lamp drives chip 7, one first diode 81, the second diode 82, as shown in Figure 6, the positive pole of the first diode 81 connects photoflash lamp and drives chip 7, the negative pole of the first diode 81 connects photoflash lamp 1, the anodal power output end that connects pressurizer 4 of the second diode 82, negative pole connects photoflash lamp 1.
Particularly, mobile terminal is under off-mode, when control switch 3 is closed, battery 2 forms path with pressurizer 4 Enable Pins, battery 2 gives pressurizer 4 power supplies, pressurizer 4 is in running order, output voltage is to photoflash lamp 1, now the second diode 82 cathode voltages are higher than cathode voltage, the second diode 82 is in conducting state, photoflash lamp 1 is luminous, flashlight function is opened, simultaneously, because the first diode 81 is anodal, connect one end that photoflash lamp drives chip 7, negative pole connects photoflash lamp 1, the first diode 81 cathode voltages are lower than cathode voltage, now the first diode 81 is in cut-off state, like this, when battery 2 is given photoflash lamp 1 power supply, electric current will can not enter into photoflash lamp and drive chip 7, thereby drive chip 7 to bring damage to photoflash lamp, the problem that there will not be electric current to pour in down a chimney, protected photoflash lamp to drive chip.
Preferably, described flashlight drive circuit also comprises one second capacitor cell, and one end of described the second capacitor cell connects described pressurizer, other end ground connection.
Figure 7 shows that the circuit diagram of a specific embodiment of flashlight drive circuit, in figure, FLASH Driver is that photoflash lamp drives chip, photoflash lamp is LED, and battery is VB, and control switch is SW, pressurizer is LDO, the output that OUT is pressurizer, the Enable Pin that EN is pressurizer.The first resistance unit is R1, and the second resistance unit is R2, and the first capacitor cell is C1.Voltage comparator circuit comprises voltage comparator U1, reference voltage source Vref.In addition, also comprise that one the 3rd resistance unit is R3, flashlight drive circuit also comprises the second capacitor cell C2, the first diode D1, the second diode D2.
Particularly, under mobile terminal off-mode, when control switch SW is closed, battery VB divides the normal phase input end at the voltage access voltage comparator U1 of the second resistance unit R2, reference voltage source Vref connects the negative-phase input of voltage comparator U1, when battery VB divides the reference voltage that the voltage on the second resistance unit R2 provides higher than reference voltage source Vref, voltage comparator U1 exports high level signal, pressurizer LDO Enable Pin is effective, pressurizer LDO output voltage is powered to photoflash lamp LED, thereby drive photoflash lamp LED luminous, opened flashlight function.
When battery VB divides the reference voltage that the voltage on the second resistance unit R2 provides lower than reference voltage source Vref, voltage comparator U1 output low level signal, pressurizer LDO Enable Pin is invalid, pressurizer LDO does not work, Non voltage output, photoflash lamp LED does not work, and flashlight function is closed.
When control switch disconnects, pressurizer LDO Enable Pin is invalid, and pressurizer LDO Non voltage output therefore can not drive photoflash lamp LED luminous, thereby flashlight function is closed.At mobile terminal under open state, can make pressurizer Enable Pin effective by Closed control switch, power supply, to photoflash lamp, drives photoflash lamp luminous, open flashlight function, also can realize by button the startup of flashlight function under mobile terminal-opening state.
Wherein, the first diode D1 and the second diode D2 drive chip FLASH Driver to play the effect of insulation blocking to photoflash lamp, prevent that electric current from pouring in down a chimney, and to photoflash lamp, drive chip FLASH Driver to cause damage.
On the other hand, the embodiment of the present invention also provides a kind of mobile terminal, and described mobile terminal comprises flashlight drive circuit described above.
Based on technique scheme, in the embodiment of the present invention, described photoflash lamp one end connects the power output end of described pressurizer, one end ground connection, described battery one end connects the power input of described pressurizer, one end ground connection, described control switch one end connects described battery, and the other end connects the Enable Pin of described pressurizer.Like this, under mobile terminal off-mode, when control switch is closed, battery is powered to pressurizer, and pressurizer Enable Pin is high level, and pressurizer Enable Pin is effective, stabilizer output voltage is powered to photoflash lamp, thereby drives photoflash lamp luminous, has opened flashlight function, when control switch disconnects, pressurizer Enable Pin is low level, and pressurizer Enable Pin is invalid, pressurizer Non voltage output, therefore can not drive photoflash lamp luminous, thereby flashlight function is closed.At mobile terminal under open state, can make pressurizer Enable Pin effective by Closed control switch, power supply, to photoflash lamp, drives photoflash lamp luminous, open flashlight function, also can realize by button the startup of flashlight function under mobile terminal-opening state.
It should be noted that, each resistance unit, capacitor cell unit can be realized for the combination of one or more devices above, be that above-mentioned arbitrary resistance unit can comprise at least one resistance, while comprising at least two resistance in above-mentioned arbitrary resistance unit, resistance in described resistance unit can be in parallel, also can connect, and the size of described resistance can fix, also can change; Above-mentioned capacitor cell unit can comprise at least one capacitor cell, while comprising at least two capacitor cells in above-mentioned capacitor cell unit, capacitor cell in described capacitor cell unit can be in parallel, also can connect, and the size of described capacitor cell can be fixed, also can change.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (9)
1. a flashlight drive circuit, it is characterized in that, comprising: photoflash lamp, battery, control switch, pressurizer, described photoflash lamp one end connects the power output end of described pressurizer, one end ground connection, described battery one end connects the power input of described pressurizer, one end ground connection, described control switch one end connects described battery, and the other end connects the Enable Pin of described pressurizer.
2. flashlight drive circuit according to claim 1, it is characterized in that, also comprise the first resistance unit, the second resistance unit, described first resistance unit one end connects described control switch, one end connects the Enable Pin of described pressurizer, described second resistance unit one end connects described the first resistance unit, one end ground connection.
3. flashlight drive circuit according to claim 2, is characterized in that, also comprises one first capacitor cell, and described the first capacitor cell two ends connect respectively the two ends of described the second resistance unit.
4. flashlight drive circuit according to claim 2, it is characterized in that, also comprise a voltage comparator circuit, described voltage comparator circuit output is connected with the Enable Pin of described pressurizer, for at described cell voltage during lower than reference voltage, output low level signal is to described pressurizer.
5. flashlight drive circuit according to claim 4, it is characterized in that, described voltage comparator circuit comprises voltage comparator, reference voltage source, the output of described voltage comparator connects the Enable Pin of described pressurizer, the normal phase input end of described voltage comparator connects between described the first resistance unit and the second resistance unit, the negative-phase input of described voltage comparator connects described reference voltage source, described reference voltage source other end ground connection.
6. flashlight drive circuit according to claim 5, is characterized in that, also comprises one the 3rd resistance unit, and described the 3rd resistance unit one end connects the output of described voltage comparator, and one end connects described battery.
7. flashlight drive circuit according to claim 1, it is characterized in that, also comprise that photoflash lamp drives chip, one first diode, the second diode, the positive pole of described the first diode connects described photoflash lamp and drives chip, the negative pole of described the first diode connects described photoflash lamp, described the second diode cathode connects the output of described pressurizer, and negative pole connects described photoflash lamp.
8. flashlight drive circuit according to claim 1, is characterized in that, also comprises one second capacitor cell, and one end of described the second capacitor cell connects described pressurizer, other end ground connection.
9. a mobile terminal, is characterized in that, comprises the arbitrary described flashlight drive circuit of the claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410302683.6A CN104159359A (en) | 2014-06-30 | 2014-06-30 | Electric torch drive circuit and mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410302683.6A CN104159359A (en) | 2014-06-30 | 2014-06-30 | Electric torch drive circuit and mobile terminal |
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| CN104159359A true CN104159359A (en) | 2014-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410302683.6A Pending CN104159359A (en) | 2014-06-30 | 2014-06-30 | Electric torch drive circuit and mobile terminal |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016131298A1 (en) * | 2015-07-10 | 2016-08-25 | 中兴通讯股份有限公司 | Terminal having multiple light functions |
| CN106793392A (en) * | 2016-12-13 | 2017-05-31 | 广东欧珀移动通信有限公司 | The control circuit of breath light, control method and terminal |
| CN107404549A (en) * | 2017-08-14 | 2017-11-28 | 广东欧珀移动通信有限公司 | Mobile terminal and its flashlight drive circuit |
| CN113099586A (en) * | 2021-04-16 | 2021-07-09 | 佛山市威格特电气设备有限公司 | Flashlight control circuit based on intelligent helmet |
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| JP2009176499A (en) * | 2008-01-23 | 2009-08-06 | Ichikoh Ind Ltd | Vehicular lamp lighting circuit |
| KR20110028149A (en) * | 2009-09-11 | 2011-03-17 | 삼성엘이디 주식회사 | Lamp driving circuit reducing power consumption of switching control ic |
| CN102665320A (en) * | 2012-03-22 | 2012-09-12 | 惠州Tcl移动通信有限公司 | Portable electronic equipment and flash lamp control circuit thereof |
| CN203457209U (en) * | 2013-09-12 | 2014-02-26 | 深圳市渴望通信有限公司 | Cellphone with strong light illumination function |
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2014
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009176499A (en) * | 2008-01-23 | 2009-08-06 | Ichikoh Ind Ltd | Vehicular lamp lighting circuit |
| KR20110028149A (en) * | 2009-09-11 | 2011-03-17 | 삼성엘이디 주식회사 | Lamp driving circuit reducing power consumption of switching control ic |
| CN102665320A (en) * | 2012-03-22 | 2012-09-12 | 惠州Tcl移动通信有限公司 | Portable electronic equipment and flash lamp control circuit thereof |
| CN203457209U (en) * | 2013-09-12 | 2014-02-26 | 深圳市渴望通信有限公司 | Cellphone with strong light illumination function |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016131298A1 (en) * | 2015-07-10 | 2016-08-25 | 中兴通讯股份有限公司 | Terminal having multiple light functions |
| CN106793392A (en) * | 2016-12-13 | 2017-05-31 | 广东欧珀移动通信有限公司 | The control circuit of breath light, control method and terminal |
| CN107404549A (en) * | 2017-08-14 | 2017-11-28 | 广东欧珀移动通信有限公司 | Mobile terminal and its flashlight drive circuit |
| CN113099586A (en) * | 2021-04-16 | 2021-07-09 | 佛山市威格特电气设备有限公司 | Flashlight control circuit based on intelligent helmet |
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