CN104159358A - Electric torch drive circuit and mobile terminal - Google Patents

Electric torch drive circuit and mobile terminal Download PDF

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Publication number
CN104159358A
CN104159358A CN201410302682.1A CN201410302682A CN104159358A CN 104159358 A CN104159358 A CN 104159358A CN 201410302682 A CN201410302682 A CN 201410302682A CN 104159358 A CN104159358 A CN 104159358A
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China
Prior art keywords
resistance unit
control circuit
battery
connects
photoflash lamp
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CN201410302682.1A
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Chinese (zh)
Inventor
王树利
牛永波
王富远
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Hisense Mobile Communications Technology Co Ltd
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Hisense Mobile Communications Technology Co Ltd
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Priority to CN201410302682.1A priority Critical patent/CN104159358A/en
Publication of CN104159358A publication Critical patent/CN104159358A/en
Pending legal-status Critical Current

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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 an on-off control circuit. One end of the battery is grounded, and the other end of the battery is connected with the on-off control circuit. One end of the control switch is grounded, and the other end of the control switch is connected with the on-off control circuit. One end of the on-off control circuit is connected with the flash lamp. The on-off control circuit is used for driving the flash lamp to emit light through the battery when the control switch is closed and disconnecting the battery from the flash lamp when the control switch is opened.

Description

A kind of flashlight drive circuit and mobile terminal
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, 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, ON-OFF control circuit, described battery one end ground connection, one end is connected with described ON-OFF control circuit, described control switch one end ground connection, one end is connected with described ON-OFF control circuit, described ON-OFF control circuit one end connects described photoflash lamp, and described ON-OFF control circuit is for when described control switch is closed, luminous by described battery-operated described photoflash lamp, when described control switch disconnects, described battery and described photoflash lamp are disconnected.
Preferably, described ON-OFF control circuit comprises the first diode, field effect transistor, the first resistance unit, the 3rd resistance unit, described the first diode cathode connects described control switch, negative pole connects the grid of described field effect transistor, described first resistance unit one end connects described the first diode cathode, and one end connects described battery, and described the 3rd resistance unit one end connects described the first diode cathode, one end ground connection, the drain electrode of described field effect transistor connects described photoflash lamp.
Preferably, described ON-OFF control circuit also comprises the second resistance unit, and described second resistance unit one end connects described field effect transistor source electrode, and one end connects described battery.
Preferably, described ON-OFF control circuit also comprises a capacitor cell, and described capacitor cell two ends connect respectively the two ends of described the 3rd resistance unit.
Preferably, described drive circuit also comprises a control circuit, and described control circuit one end connects described ON-OFF control circuit, and one end connects described battery, and described control circuit, for when receiving level signal, disconnects described battery and described photoflash lamp.
Preferably, described control circuit comprises a triode, the 4th resistance unit, the 5th resistance unit, the 6th resistance unit, the base stage of described triode is connected with one end of described the 4th resistance unit, the collector electrode of described triode connects described battery, the emitter of described triode connects described the 3rd resistance unit, the other end of described the 4th resistance unit is signal input part, one end of described the 5th resistance unit connects the base stage of described triode, other end ground connection, one end of described the 6th resistance unit connects the emitter of described triode, other end ground connection.
Preferably, also comprise voltage comparator circuit, described voltage comparator circuit output is connected with the signal input part of described control circuit, at described cell voltage during lower than reference voltage, outputs level signals, to described control circuit, disconnects described battery and described photoflash lamp.
Preferably, described voltage comparator circuit comprises voltage comparator, the 8th resistance unit, the 9th resistance unit, reference voltage source, the output of described voltage comparator connects described signal input part, described the 8th resistance unit one end connects described battery, one end connects the negative-phase input of described voltage comparator, described the 9th resistance unit one end connects described the 8th resistance unit, other end ground connection, described reference voltage source one end connects the normal phase input end of described voltage comparator, other end ground connection, described battery connects the power input of described voltage comparator.
Preferably, described flashlight drive circuit also comprises that photoflash lamp drives chip, one second diode, the 3rd diode, described the second diode cathode connects one end of described ON-OFF control circuit, negative pole connects described photoflash lamp, the positive pole of described the 3rd diode connects described photoflash lamp and drives chip, and the negative pole of described the 3rd diode connects described photoflash lamp.
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, by increasing battery, control switch, ON-OFF control circuit, under mobile terminal off-mode, when control switch is closed, ON-OFF control circuit makes battery and photoflash lamp form path, by battery, to photoflash lamp, power, thereby drive photoflash lamp luminous, opened flashlight function, when control switch disconnects, ON-OFF control circuit disconnects battery and photoflash lamp, and formation is opened circuit, and battery 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 battery-operated photoflash lamp luminous by Closed control switch, open flashlight function, 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 Fig. 2 flashlight drive circuit;
Fig. 4 is the another kind of schematic diagram of flashlight drive circuit 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 another kind of schematic diagram in the embodiment of the present invention;
Fig. 7 is the schematic diagram of voltage comparator circuit in flashlight drive circuit;
Fig. 8 is a kind of schematic diagram of flashlight drive circuit in the embodiment of the present invention;
Fig. 9 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, a kind of flashlight drive circuit is provided, comprise: photoflash lamp 1, battery 2, control switch 3, ON-OFF control circuit 4, battery 2 one end ground connection, one end is connected with ON-OFF control circuit 4, control switch 3 one end ground connection, one end is connected with ON-OFF control circuit 4, and ON-OFF control circuit 4 one end connect photoflash lamp 1, ON-OFF control circuit 4 is for when control switch 3 is closed, by battery 2, drive photoflash lamp 1 luminous, when control switch 3 disconnects, battery 2 and photoflash lamp 1 are disconnected.
In the embodiment of the present invention, by increasing battery, control switch, ON-OFF control circuit, under mobile terminal off-mode, when control switch is closed, ON-OFF control circuit makes battery and photoflash lamp form path, by battery, to photoflash lamp, powers, thereby drive photoflash lamp luminous, opened flashlight function, when control switch disconnects, ON-OFF control circuit disconnects battery and photoflash lamp, formation is opened circuit, battery 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 battery-operated photoflash lamp luminous by Closed control switch, open flashlight function, can realize by button the startup of flashlight function under mobile terminal-opening state.
Preferably, in the embodiment of the present invention, as shown in Figure 3, ON-OFF control circuit 4 comprises the first diode 41, field effect transistor 42, the first resistance unit 43, the anodal control switch 3 that connects of the 3rd resistance unit 45, the first diode 41, negative pole connects the grid of field effect transistor 42, first resistance unit 43 one end connect the first diode 41 positive poles, and one end connects battery 2, the three resistance unit 45 one end and connects the first diode 41 negative poles, one end ground connection, the drain electrode of field effect transistor 42 connects photoflash lamp 1.
Preferably, described ON-OFF control circuit 4 also comprises that one second resistance unit 44, the second resistance unit 44 one end connect field effect transistor 42 source electrodes, and one end connects battery 2.
Wherein, field effect transistor 42 is chosen as PMOS pipe.
Particularly, at mobile terminal during in off-mode, when control switch 3 is closed, the first diode 41 plus earths, the first diode 41 is in cut-off state, the 3rd resistance unit 45 ground connection, the first diode 41 negative poles are dragged down by the 3rd resistance unit 45, therefore, field effect transistor 42 grid voltages are low, according to the on state characteristic of field effect transistor, field effect transistor 42 is now in conducting state, now, battery 2, the second resistance unit 44, field effect transistor 42, photoflash lamp 1 is in path, battery 2 is photoflash lamp 1 power supply, photoflash lamp 1 is luminous, opened flashlight function.When control switch 3 disconnects, according to the one-way conduction characteristic of diode, now the first diode 41 is in conducting state, the first diode 41 forms path with battery 2, the first resistance unit 43, the 3rd resistance unit 45, now, the grid voltage of field effect transistor 42 is the voltage at the 3rd resistance unit 45 two ends, field effect transistor 42 grid voltages are high, field effect transistor 42 is in cut-off state, battery 2 and photoflash lamp 1 are in off-state, battery 2 can not make photoflash lamp 1 luminous for photoflash lamp 1 power supply, and flashlight function is in closed condition.
Wherein, the first resistance unit 43, the 3rd resistance unit 45 play the effect of dividing potential drop.Can be that the first resistance unit 43, the 3rd resistance unit 45 are chosen suitable resistance as required, according to the voltage that its minute gets, control the grid voltage of field effect transistor 42, thereby control field effect transistor 42 in cut-off state.
Particularly, the resistance that can choose the first resistance unit 43 is 10k Ω, and the resistance of the 3rd resistance unit 45 is 200k Ω.
Wherein, the second resistance unit 44 plays the effect of current limliting, and the resistance of the second resistance unit 44 is less.
At mobile terminal, during in open state, can make battery 2 for photoflash lamp 1 power supply by Closed control switch 3, drive photoflash lamp 1 luminous, open flashlight function.Control switch can be set to a button of mobile terminal, therefore, under open state, not by software operation, by button, also can realize the unlatching of flashlight function.
Preferably, described ON-OFF control circuit also comprises a capacitor cell, and described capacitor cell two ends connect respectively the two ends of described the 3rd resistance unit 45.The effect of capacitor cell is the voltage at the 3rd resistance unit two ends to play the effect of voltage stabilizing.
Preferably, described flashlight drive circuit also comprises a control circuit 5, as shown in Figure 4, control circuit 5 one end are connected with ON-OFF control circuit 4, one end is connected with battery 2, and described control circuit 5, for when receiving level signal, disconnects battery 2 and photoflash lamp 1.This level signal can be also high level signal for low level signal, in embodiments of the present invention, take and receives high level signal effectively as example describes.
Preferably, as shown in Figure 5, control circuit 5 comprises a triode 51, the 4th resistance unit 52, the 5th resistance unit 53, the 6th resistance unit 54, the base stage of triode 51 is connected with one end of the 4th resistance unit 52, the collector electrode of triode 51 connects battery 2, the emitter of triode 51 connects the 3rd resistance unit 45, the other end of the 4th resistance unit 52 is signal input part, the base stage of one end connecting triode 51 of the 5th resistance unit 53, other end ground connection, the emitter of one end connecting triode 51 of the 6th resistance unit 54, other end ground connection.
Wherein, triode 51 is NPN type triode.
Particularly, signal input part receives level signal, and this sentences high level signal effectively for example describes.Signal input part receives high level signal, by the 4th resistance unit 52, be connected to the base stage of triode 51, the state of triode 51 in conducting, battery 2, the 3rd resistance unit 45, triode 51 and the 6th resistance unit 54 are in path, the grid voltage of field effect transistor 42 is high, and now field effect transistor 42 is in cut-off state, even control switch 3 closures, ON-OFF control circuit 4 also uncontrollable battery 2 power supplies, to photoflash lamp 1, makes it luminous.Now control switch 3 loses its effect.
Because mobile terminal shooting is to share a photoflash lamp with photoflash lamp and flashlight function photoflash lamp conventionally, mobile terminal is under open state, if user uses camera to take pictures or make a video recording while using photoflash lamp, existence due to control circuit, can make control switch ineffective, even control switch is closed, also cannot make battery is photoflash lamp power supply, opens the flashlight function of photoflash lamp.Like this, just guaranteed the effect that user takes pictures and makes a video recording, avoided causing and conflicting with flashlight function.
In addition, signal input part at control circuit 5 receives low level signal, triode 51 is in cut-off state, now control circuit 5 no longer works to ON-OFF control circuit 4, the control of the main suspension control switch 3 of grid voltage of field effect transistor 42, ON-OFF control circuit 4 can or be opened and open or close flashlight function according to control switch 3 closures.
Wherein, the 4th resistance unit 52, the 5th resistance unit 53 act as dividing potential drop.The 4th resistance unit 52, the 5th resistance unit 53 provide necessary bias voltage for triode 51.
The 6th resistance unit 54 and the 3rd resistance unit 45 actings in conjunction, the grid voltage of control field effect transistor 42, to control field effect transistor 42 in cut-off state.
Wherein, the resistance of the 6th resistance unit 54 can be elected 200k Ω as.
Preferably, control circuit 5 also comprises one the 7th resistance unit, and one end of the 7th resistance unit connects signal input part, the collector electrode of the other end connecting triode 51 of the 7th resistance unit.
Wherein, the 7th resistance unit plays pull-up resistor, can arrange and adds or do not add according to the actual voltage comparator of choosing.
Preferably, described flashlight drive circuit also comprises voltage comparator circuit 6, as shown in Figure 6, voltage comparator circuit 6 outputs are connected with the signal input part of control circuit 5, for at battery 2 voltages during lower than reference voltage, outputs level signals, to control circuit 5, disconnects battery 2 and photoflash lamp 1.
Increased voltage comparator circuit 6, at battery 2 voltages, during lower than reference voltage, outputs level signals, to control circuit 5, disconnects battery 2 and photoflash lamp 1, and battery 2, in consumes power stage no longer, has played to battery the effect of protecting like this.
Preferably, as shown in Figure 7, voltage comparator circuit 6 comprises voltage comparator 61, the 8th resistance unit 62, the 9th resistance unit 63, reference voltage source 64, the output of voltage comparator 61 connects the signal input part of control circuit 5, the 8th resistance unit 62 one end connect battery 2, one end connects the negative-phase input of voltage comparator 61, the 9th resistance unit 63 one end connect the 8th resistance unit 62, other end ground connection, reference voltage source 64 one end connect the normal phase input end of voltage comparator 61, other end ground connection, battery 2 connects the power input of voltage comparator 61.
Particularly, the voltage of the reference voltage source of usining output is as reference voltage, cell voltage is after the dividing potential drop of the 8th resistance unit, the 9th resistance unit, the voltage difference at the 9th resistance unit two ends is as the negative-phase input input of voltage comparator 61, the voltage of reference voltage source output is that reference voltage is as the normal phase input end input of voltage comparator 61, the voltage difference that is positioned at the 9th resistance unit 63 two ends as cell voltage after dividing potential drop, lower than reference voltage, is output as high level signal through voltage comparator 61.High level signal inputs to control circuit 5 through described signal input part, control circuit 5 receives high level signal, triode 51 conductings, battery 2 and the 3rd resistance unit 45, triode 51 and the 6th resistance unit 54 are in path, the grid voltage of field effect transistor 42 is high, and now field effect transistor 42 is in cut-off state, and battery 2 and photoflash lamp 1 are in opening circuit, battery 2 cannot be powered to photoflash lamp 1, makes it luminous.Now, battery 2 is in the state of consumes power not.
Owing to having increased voltage comparator circuit 6; when voltage difference that cell voltage is positioned at the 9th resistance unit two ends after dividing potential drop being detected lower than reference voltage; just export high level signal to control circuit 5; make its control battery 2 and photoflash lamp 1 in off state; battery 2 is no longer powered to photoflash lamp 1, and like this, battery 2 just can not continue power consumption again; avoid battery to cross the problem of putting, effectively protected battery.
In addition, when voltage difference that cell voltage is positioned at the 9th resistance unit two ends after dividing potential drop being detected higher than reference voltage, signal input part with regard to output low level signal to control circuit 5, control circuit 5 receives low level signal, according to the on state characteristic of triode 51, triode 51 is now in cut-off state, voltage comparator circuit 6 and control circuit 5 are now inoperative to ON-OFF control circuit 4, do not impact, ON-OFF control circuit 4 can or be opened to open flashlight function or close flashlight function according to the closed of control switch 3.
Wherein, the effect of the 8th resistance unit 62 and the 9th resistance unit 63 is dividing potential drops; the value of the 8th resistance unit 62 and the 9th resistance unit 63 is determined as required, according to the magnitude of voltage of battery protection startup and the reference voltage value of choosing, suitably chooses resistance and the proportionate relationship of these two resistance.The magnitude of voltage starting as battery protection is made as 3.3V, and reference voltage is made as 2.8V, and the resistance of the 8th resistance unit 62 and the 9th resistance unit 63 can be set to respectively 10k Ω and 56k Ω.Like this, the voltage of sharing on the 9th resistance unit 63 at cell voltage just becomes 2.8V, and when cell voltage is lower than 3.3V, the voltage minute on the 9th resistance unit 63 is just lower than 2.8V, and reference voltage value is also 2.8V, and voltage comparator is exported high level signal.When cell voltage is higher than 3.3V, the voltage minute on the 9th resistance unit 63 is just higher than 2.8V, and reference voltage value is also 2.8V, voltage comparator output low level signal.
It should be noted that, the signal of voltage comparator circuit output can be also Low level effective, and at battery 2 voltages during lower than reference voltage, output low level signal, to control circuit 5, disconnects battery 2 and photoflash lamp 1.Like this, control circuit also should be Low level effective mutually, the change corresponding to triode type of connected mode between the two, and embodiment is not described in detail at this.
Preferably, as shown in Figure 8, described flashlight drive circuit also comprises that photoflash lamp drives chip 7, one second diode 81, the 3rd diode 82, one end of the anodal connecting valve control circuit 4 of the second diode 81, negative pole connects photoflash lamp 1, the positive pole of the 3rd diode 82 connects photoflash lamp and drives the negative pole of chip 1, the three diode 82 to connect photoflash lamp 1.
Particularly, mobile terminal is under off-mode, when control switch 3 is closed, ON-OFF control circuit 4 is controlled battery 2 and is formed path with photoflash lamp 1, one end due to the anodal connecting valve control circuit 4 of the second diode 81, negative pole connects photoflash lamp 1, the second diode 81 is now in conducting state, and connect photoflash lamp because the 3rd diode 82 is anodal, drive chip 7, negative pole connects photoflash lamp 1, the opposite direction of the direction of the 3rd diode and the second diode, now the 3rd diode 82 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 1, 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 7.
Figure 9 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, battery is VB, and control switch is SW, and ON-OFF control circuit comprises: the first diode D1, field effect transistor Q1, the first resistance unit R1 the 3rd resistance unit R3.In addition also have the second resistance unit R2, capacitor C.Control circuit comprises: triode Q2, the 4th resistance unit R4, the 5th resistance unit R5, the 6th resistance unit R6.In addition also has the 7th resistance unit R7.Voltage comparator circuit comprises voltage comparator U1, reference voltage source Vref, the 8th resistance unit R8, the 9th resistance unit R9.In addition, flashlight drive circuit also comprises the second diode D2, the 3rd diode D3.
Particularly, at mobile terminal during in off-mode, when control switch SW is closed, D1 is in cut-off state, R3 ground connection, and D1 negative pole is dragged down by R3, therefore, Q1 grid voltage is low, according to the on state characteristic of field effect transistor, Q1 is now in conducting state, now, VB, R2, Q1, LED are in path, and VB is LED power supply, LED is luminous, has opened flashlight function.When control switch SW disconnects, according to the one-way conduction characteristic of diode, now D1 is in conducting state, and D1 and VB, R1, R3 form path, now, the grid voltage of Q1 is the voltage at R3 two ends, and Q1 grid voltage is high, and Q1 is in cut-off state, VB and LED are in off-state, VB can not power for LED, makes LED luminous, and flashlight function is in closed condition.
When VB divides the reference voltage that the voltage at R9 two ends provides lower than reference voltage source Vref, voltage comparator U1 exports high level signal, high level signal is connected to the base stage of triode Q2 by R4, the state of Q2 in conducting, VB, R3, Q2 and R6 are in path, and the grid voltage of Q1 is high, now Q1 is in cut-off state, even if control switch SW is closed, VB also cannot power to LED, makes it luminous.
When VB divides the reference voltage that the voltage at R9 two ends provides higher than reference voltage source Vref, voltage comparator U1 output low level signal, low level signal is received the base stage of Q2 by R4, Q2 cut-off, now, control circuit 5 no longer works to ON-OFF control circuit 4.
Wherein, D2 and D3, for FLASH Driver is played to insulation blocking, prevent that electric current from pouring in down a chimney, and FLASH Driver is caused to 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.
In the embodiment of the present invention, by increasing battery, control switch, ON-OFF control circuit, under mobile terminal off-mode, when control switch is closed, ON-OFF control circuit makes battery and photoflash lamp form path, by battery, to photoflash lamp, powers, thereby drive photoflash lamp luminous, opened flashlight function, when control switch disconnects, ON-OFF control circuit disconnects battery and photoflash lamp, formation is opened circuit, battery 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, also can make battery-operated photoflash lamp luminous by Closed control switch, 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 (10)

1. a flashlight drive circuit, it is characterized in that, comprise: photoflash lamp, battery, control switch, ON-OFF control circuit, described battery one end ground connection, one end is connected with described ON-OFF control circuit, described control switch one end ground connection, one end is connected with described ON-OFF control circuit, described ON-OFF control circuit one end connects described photoflash lamp, and described ON-OFF control circuit is for when described control switch is closed, luminous by described battery-operated described photoflash lamp, when described control switch disconnects, described battery and described photoflash lamp are disconnected.
2. flashlight drive circuit according to claim 1, it is characterized in that, described ON-OFF control circuit comprises the first diode, field effect transistor, the first resistance unit, the 3rd resistance unit, described the first diode cathode connects described control switch, negative pole connects the grid of described field effect transistor, described first resistance unit one end connects described the first diode cathode, one end connects described battery, described the 3rd resistance unit one end connects described the first diode cathode, one end ground connection, the drain electrode of described field effect transistor connects described photoflash lamp.
3. flashlight drive circuit according to claim 2, is characterized in that, described ON-OFF control circuit also comprises one second resistance unit, and described second resistance unit one end connects the source electrode of described field effect transistor, and one end connects described battery.
4. flashlight drive circuit according to claim 2, is characterized in that, described ON-OFF control circuit also comprises a capacitor cell, and described capacitor cell two ends connect respectively the two ends of described the 3rd resistance unit.
5. flashlight drive circuit according to claim 2, it is characterized in that, also comprise a control circuit, described control circuit one end connects described ON-OFF control circuit, one end connects described battery, described control circuit, for when receiving level signal, disconnects described battery and described photoflash lamp.
6. flashlight drive circuit according to claim 5, it is characterized in that, described control circuit comprises a triode, the 4th resistance unit, the 5th resistance unit, the 6th resistance unit, the base stage of described triode is connected with one end of described the 4th resistance unit, the collector electrode of described triode connects described battery, the emitter of described triode connects described the 3rd resistance unit, the other end of described the 4th resistance unit is signal input part, one end of described the 5th resistance unit connects the base stage of described triode, other end ground connection, one end of described the 6th resistance unit connects the emitter of described triode, other end ground connection.
7. flashlight drive circuit according to claim 5, it is characterized in that, also comprise voltage comparator circuit, described voltage comparator circuit output is connected with the signal input part of described control circuit, for at described cell voltage during lower than reference voltage, outputs level signals, to described control circuit, disconnects described battery and described photoflash lamp.
8. flashlight drive circuit according to claim 7, it is characterized in that, described voltage comparator circuit comprises voltage comparator, the 8th resistance unit, the 9th resistance unit, reference voltage source, the output of described voltage comparator connects described signal input part, described the 8th resistance unit one end connects described battery, one end connects the negative-phase input of described voltage comparator, described the 9th resistance unit one end connects described the 8th resistance unit, other end ground connection, described reference voltage source one end connects the normal phase input end of described voltage comparator, other end ground connection, described battery connects the power input of described voltage comparator.
9. flashlight drive circuit according to claim 1, it is characterized in that, also comprise that photoflash lamp drives chip, one second diode, the 3rd diode, described the second diode cathode connects one end of described ON-OFF control circuit, negative pole connects described photoflash lamp, the positive pole of described the 3rd diode connects described photoflash lamp and drives chip, and the negative pole of described the 3rd diode connects described photoflash lamp.
10. a mobile terminal, is characterized in that, comprises the arbitrary described flashlight drive circuit of the claims 1-9.
CN201410302682.1A 2014-06-30 2014-06-30 Electric torch drive circuit and mobile terminal Pending CN104159358A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104618573A (en) * 2014-12-25 2015-05-13 惠州Tcl移动通信有限公司 Method for controlling status of flashlight and mobile terminal
CN106061003A (en) * 2016-05-25 2016-10-26 青岛海信移动通信技术股份有限公司 Mobile terminal

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040108841A1 (en) * 2002-11-27 2004-06-10 Arthur James David Converter for electronic flashlight
CN101778513A (en) * 2010-02-05 2010-07-14 海洋王照明科技股份有限公司 LED flow equalizing control circuit, LED driver module and navigation aiding light
CN201590842U (en) * 2009-11-06 2010-09-22 惠州Tcl移动通信有限公司 3G mobile phone with discharging-protecting battery
CN102006699A (en) * 2009-09-02 2011-04-06 海洋王照明科技股份有限公司 Police photo-taking light circuit
CN201902966U (en) * 2010-10-22 2011-07-20 深圳市旭日东方实业有限公司 Solar lamp
CN102572040A (en) * 2010-12-30 2012-07-11 希姆通信息技术(上海)有限公司 Mobile terminal
CN102595717A (en) * 2012-01-19 2012-07-18 李玉麟 Protection circuit of light-emitting diode (LED) lamp driving power supply and LED lamp driving power supply
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

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040108841A1 (en) * 2002-11-27 2004-06-10 Arthur James David Converter for electronic flashlight
CN102006699A (en) * 2009-09-02 2011-04-06 海洋王照明科技股份有限公司 Police photo-taking light circuit
CN201590842U (en) * 2009-11-06 2010-09-22 惠州Tcl移动通信有限公司 3G mobile phone with discharging-protecting battery
CN101778513A (en) * 2010-02-05 2010-07-14 海洋王照明科技股份有限公司 LED flow equalizing control circuit, LED driver module and navigation aiding light
CN201902966U (en) * 2010-10-22 2011-07-20 深圳市旭日东方实业有限公司 Solar lamp
CN102572040A (en) * 2010-12-30 2012-07-11 希姆通信息技术(上海)有限公司 Mobile terminal
CN102595717A (en) * 2012-01-19 2012-07-18 李玉麟 Protection circuit of light-emitting diode (LED) lamp driving power supply and LED lamp driving power supply
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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104618573A (en) * 2014-12-25 2015-05-13 惠州Tcl移动通信有限公司 Method for controlling status of flashlight and mobile terminal
CN104618573B (en) * 2014-12-25 2019-04-30 惠州Tcl移动通信有限公司 Control the method and mobile terminal of flashlight state
CN106061003A (en) * 2016-05-25 2016-10-26 青岛海信移动通信技术股份有限公司 Mobile terminal
CN106061003B (en) * 2016-05-25 2018-03-16 青岛海信移动通信技术股份有限公司 Mobile terminal

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Application publication date: 20141119