CN105682321A - Backlight driving circuit and mobile terminal - Google Patents
Backlight driving circuit and mobile terminal Download PDFInfo
- Publication number
- CN105682321A CN105682321A CN201610056545.3A CN201610056545A CN105682321A CN 105682321 A CN105682321 A CN 105682321A CN 201610056545 A CN201610056545 A CN 201610056545A CN 105682321 A CN105682321 A CN 105682321A
- Authority
- CN
- China
- Prior art keywords
- module
- resistance
- diode
- driving circuit
- backlight source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention belongs to the backlight driving field, and provides a backlight driving circuit and a mobile terminal. The backlight driving circuit comprises a driving module, a power supply protection module, a power supply module, a current control module and a circuit protection module. According to the backlight driving circuit, the backlight driving circuit is powered through the power supply module, the power supply module is protected through the power supply protection module, and an abnormal condition of the power supply module is avoided; in addition, the power supply loop is switched off through the circuit protection module when the circuit is in an abnormal condition; and meanwhile, the current output by the power supply module is limited through a diode of the current control module. The backlight driving circuit provided by the embodiments of the invention is quite high in stability, capable of preventing the backlight module of the mobile terminal from being damaged by abnormal currents or voltages, and capable of prolonging the service life of the mobile terminal.
Description
Technical field
The invention belongs to backlight driver field, particularly to a kind of backlight source driving circuit and mobile terminal.
Background technology
Mobile terminal has the history of decades as simple communication equipment with Mobile Communication Development. Starting from 2007, intellectuality has caused mobile terminal gene mutation, fundamentally changes the terminal tradition location as mobile network's tip. Mobile intelligent terminal is almost changed into crucial entrance and the main innovation platform of Internet service between a flash, new media, ecommerce and information service platform, the most important hinge of Internet resources, mobile network resource and environmental interaction resource, its operating system and processor chips even become the strategic high ground of current whole ICT industry.
But, the display screen of mobile terminal there will be flower screen when in use or dodges the situation of screen, traces it to its cause, is that the backlight source driving circuit of display screen goes wrong, the too high abnormal show causing instability of curtage, reduces the service life of mobile terminal.
Summary of the invention
It is an object of the invention to provide a kind of backlight source driving circuit, it is intended to solve the problem driving existence and stability difference of the backlight of existing mobile terminal.
In order to solve above-mentioned technical problem, the present invention is achieved in that a kind of backlight source driving circuit, including for connecting backlight source module the driving module driving described backlight source module to work;
Described backlight source driving circuit also includes power source protective module, power module, current control module and circuit protection module;
The input of the positive pole of described power module and described power source protective module connects the earth terminal of the positive power source terminal forming described backlight source driving circuit, the negative pole of described power module and described power source protective module altogether and connects the negative power end forming described backlight source driving circuit altogether and be connected to ground;
The outfan of described power source protective module connects the input of described circuit protection module, the outfan of described circuit protection module connects the input of described current control module, the power end of the outfan of described current control module and described driving module connects the positive output end forming described backlight source driving circuit altogether, described driving module has drive end, the negative output terminal that drive end is described backlight source driving circuit of described driving module;
Described circuit protection module realizes break-make for the size of the voltage exported according to described power module and electric current;
The electric current of described driving module output is not more than the default operating current of described backlight source module.
Another object of the present invention also resides in a kind of mobile terminal of offer, including backlight source module, also includes above-mentioned backlight source driving circuit.
Backlight source driving circuit provided by the present invention includes driving module, power source protective module, power module, current control module and circuit protection module. This backlight source driving circuit utilizes power module to power for backlight source driving circuit, and adopts power source protective module that power module is protected, it is to avoid abnormal phenomena occurs in power module; It addition, utilize circuit protection module deenergization loop when abnormal situation occurs in circuit; Meanwhile, the electric current that the diode pair power module in current control module exports is utilized to carry out current limliting. The backlight source driving circuit that the embodiment of the present invention provides has significantly high stability, and the backlight source module of protection mobile terminal is not damaged by abnormal current or voltage, improves the service life of mobile terminal.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of the backlight source driving circuit that first embodiment of the invention provides;
Fig. 2 is the exemplary circuit structure chart of the backlight source driving circuit that first embodiment of the invention provides;
Fig. 3 is the exemplary circuit structure chart of the circuit protection module that first embodiment of the invention provides;
Fig. 4 is the exemplary circuit structure chart of the backlight source driving circuit that second embodiment of the invention provides.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated. Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
Embodiment 1
Fig. 1 illustrates the circuit structure of the backlight source driving circuit that the present embodiment provides, and for the ease of illustrating, illustrate only part related to the present embodiment, details are as follows:
The backlight source driving circuit that the present embodiment provides includes the driving module 10 connecting backlight source module and driving backlight source module to work.
Further, backlight source driving circuit also includes power source protective module 40, power module 50, current control module 20 and circuit protection module 30.
Concrete, the input of the positive pole of power module 50 and power source protective module 40 connects the earth terminal of the positive power source terminal forming backlight source driving circuit, the negative pole of power module 50 and power source protective module 40 altogether and connects the negative power end forming backlight source driving circuit altogether and be connected to ground;
The outfan of power source protective module 40 connects the input of described circuit protection module 30; the outfan of described circuit protection module 30 connects the input of current control module 20; the outfan of current control module 20 connects, with the power end driving module 10, the positive output end forming backlight source driving circuit altogether; drive module 10 to have drive end, drive the negative output terminal that drive end is backlight source driving circuit of module 10.
Concrete, the positive power source terminal of backlight source driving circuit and negative power end are for accessing electric current to realize the charging to power module 50, and the positive output end of backlight source driving circuit is used for being connected backlight source module with negative output terminal, and output services electric current is to backlight source module.
Wherein, circuit protection module 30 realizes break-make for the size of the voltage according to power module 50 output with electric current.
Further, driving the electric current of module 10 output to be not more than the default operating current of backlight source module, current control module 20 includes the diode that multiple head and the tail are sequentially connected in series.
In the present embodiment, as in figure 2 it is shown, current control module 20 may include that
First diode D1, the second diode D2 and the 3rd diode D3;
The negative electrode of the first diode D1 connects the anode of the second diode D2, the negative electrode of the second diode D2 connects the anode of the 3rd diode D3, the input of the first diode D1 is the input of current control module 20, and the anode of the 3rd diode D3 is the input of current control module 20.
In the present embodiment, power source protective module 40 is mainly the overvoltage to battery, under-voltage, crosses stream, and short circuit is protected. And on the output loop of power module, have employed multiple diode and carry out multiple protective.
In the present embodiment, as in figure 2 it is shown, drive module 10 may include that
First resistance R1, switch K1, the first electric capacity C1 and backlight driver chip U2;
The power end VDD and drive end QDD of backlight driver chip U2 is the power end and the drive end that drive module 10 respectively, first end arranging end SET and the first resistance R1 of backlight driver chip U2 is connected to first end of switch K1 altogether, second end of switch K1 and first end of the first electric capacity C1 are connected to the power end VDD of backlight driver chip U2 altogether, the test lead TEST and earth terminal GND of backlight driver chip U2 is connected to ground altogether, and second end of the first resistance R1 and second end of the first electric capacity C1 are connected to ground altogether.
In the present embodiment, inside backlight driver chip U2, there are on-off circuit and current detection circuit, different electric current output can be obtained according to the model of selected chip. It addition, backlight driver chip U2 is low voltage difference chip, power consumption own is very low, it is possible to reduce overall energy consumption.
In the present embodiment, regulating of the brightness of backlight holds the level signal of SET to realize according to arranging of backlight driver chip U2. First resistance R1 is to when circuit steady operation, provide a low level signal to the end SET that arranges of backlight driver chip U2. The operation that regulates of the brightness of backlight is all determined to the time span arranging the end SET high level signal provided of driving chip U2 by switch K1.
In the present embodiment, as it is shown on figure 3, circuit protection module 30 may include that
Second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the second electric capacity C2, the 3rd electric capacity C3, NMOS tube Q1, IGCT Q2, the 4th diode D4, TVS pipe TVS1 and current sample module 301;
First end of the second resistance R2, the anode of the second electric capacity C2, first end of the 3rd resistance R3 and the drain electrode of NMOS tube Q1 connect the input forming circuit protection module 30 altogether, second end of the 3rd resistance R3 and first end of the 4th resistance R4 are connected to the grid of NMOS tube Q1 altogether, second end of the second resistance R2 and second end of the 4th resistance R4 are connected to the anode of IGCT Q2 altogether, the negative electrode of IGCT Q2 connects first end of the 6th resistance R6, second end of the 6th resistance R6 and the anode of the 4th diode D4 are connected to the anode of TVS pipe TVS1 altogether, the gate pole of IGCT Q2 and first end of the 7th resistance R7 are connected to the negative electrode of the 4th diode D4 altogether, the negative electrode of TVS pipe TVS1 and first end of the 3rd electric capacity C3 are connected to first end of the 5th resistance R5 altogether, second end of the 5th resistance R5, second end of the 7th resistance R7 and the source electrode of NMOS tube Q1 are connected to the input of current sample module 301 altogether, the outfan of current sample module 301 is the outfan of circuit protection module 30, the negative electrode of the second electric capacity C2, second end of the 3rd electric capacity C3 and the negative electrode of IGCT Q2 are connected to ground altogether.
In the present embodiment, when power module 50 output voltage overvoltage, the source voltage of NMOS tube Q1 is too high, and so, the cathode voltage of TVS pipe TVS1 is also too high, and TVS pipe TVS1 turns on. And then IGCT Q2 is triggered, IGCT Q2 will turn on, and the grid voltage of NMOS tube Q1 is by high step-down, hence into cut-off state.
When power module 50 exports overcurrent, the voltage at current sample module 301 two ends can increase. When voltage increases to the trigger voltage of IGCT Q2, IGCT Q2 will turn on, and the grid voltage of NMOS tube Q1 is by high step-down, hence into cut-off state.
In the present embodiment, current sample module 301 can adopt the mode of a resistance or multiple resistor coupled in parallel to realize, for current signal is converted to voltage signal.
Further, current sample module 301 may include that
8th resistance R8, the 9th resistance R9, the tenth resistance R10 and the 11st resistance R11;
First end of the 8th resistance R8, first end of the 9th resistance R9, first end of the tenth resistance R10 and first end of the 11st resistance R11 connect the input forming current sample module 301 altogether, and second end of the 8th resistance R8, second end of the 9th resistance R9, second end of the tenth resistance R10 and second end of the 11st resistance R11 connect the outfan forming current sample module 301 altogether.
The backlight source driving circuit that the embodiment of the present invention provides utilizes power module to power for backlight source driving circuit, and adopts power source protective module that power module is protected, it is to avoid abnormal phenomena occurs in power module; It addition, utilize circuit protection module deenergization loop when abnormal situation occurs in circuit; Meanwhile, the electric current that the diode pair power module in current control module exports is utilized to carry out current limliting. The backlight source driving circuit that the embodiment of the present invention provides has significantly high stability, and the backlight source module of protection mobile terminal is not damaged by abnormal current or voltage, improves the service life of mobile terminal.
Embodiment 2
In the present embodiment, as shown in Figure 4, current control module 20 includes:
5th diode D5, the 6th diode D6 and the 12nd resistance R12;
The negative electrode of the 5th diode D5 connects the anode of the 6th diode D6, the negative electrode of the 6th diode D6 connects first end of the 12nd resistance R12, the input of the 5th diode D5 is the input of current control module 20, and second end of the 12nd resistance R12 is the input of current control module 20.
In the present embodiment, owing to diode is not belonging to infallible component, and resistance belongs to infallible component. A resistance can be adopted to replace one of them diode in a upper embodiment so that circuit has infallible component current limliting.
Concrete, the 12nd resistance R12 can adopt metalfilmresistor or Wound-rotor type resistance.
Embodiment 3
The enforcement of the present embodiment is based upon on the basis of the various embodiments described above.
In the present embodiment, backlight source driving circuit can also include the 7th diode;
The negative electrode of the 7th diode connects the positive pole of power module, and anode is the second positive power source terminal of backlight source driving circuit.
In the present embodiment, it is possible to be that power module 50 is charged by the second positive power source terminal of backlight source driving circuit and negative power end. The 7th diode increased can make backlight source driving circuit safer in charging process, it is to avoid the electronic devices and components within backlight source driving circuit are caused damage by charging current instability.
Embodiment 4
The enforcement of the present embodiment is based upon on the basis of the various embodiments described above.
In the present embodiment, backlight source driving circuit can also include critesistor;
Critesistor is serially connected with between the outfan of power source protective module 40 and the input of circuit protection module 30, and the first end of critesistor connects the outfan of power source protective module 40, and the second end of critesistor connects the input of circuit protection module 30.
In the present embodiment, critesistor primarily serves the effect of excess temperature current-limiting protection, and when temperature is too high, the resistance of critesistor increases, and reduces the size of current flowing through critesistor, further enhances the stability of this backlight source driving circuit.
Embodiment 5
The enforcement of the present embodiment is based upon on the basis of the various embodiments described above.
The purpose of the present embodiment is in that to provide a kind of mobile terminal, including backlight source module, also includes the backlight source driving circuit in any of the above-described embodiment.
In the present embodiment, backlight source driving circuit provided by the present invention includes driving module, power source protective module, power module, current control module and circuit protection module. This backlight source driving circuit utilizes power module to power for backlight source driving circuit, and adopts power source protective module that power module is protected, it is to avoid abnormal phenomena occurs in power module; It addition, utilize circuit protection module deenergization loop when abnormal situation occurs in circuit; Meanwhile, the electric current that the diode pair power module in current control module exports is utilized to carry out current limliting. The backlight source driving circuit that the embodiment of the present invention provides has significantly high stability, and the backlight source module of protection mobile terminal is not damaged by abnormal current or voltage, improves the service life of mobile terminal.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
Claims (8)
1. a backlight source driving circuit, is applied to mobile terminal, including for connecting backlight source module the driving module driving described backlight source module to work, it is characterised in that:
Described backlight source driving circuit also includes power source protective module, power module, current control module and circuit protection module;
The input of the positive pole of described power module and described power source protective module connects the earth terminal of the positive power source terminal forming described backlight source driving circuit, the negative pole of described power module and described power source protective module altogether and connects the negative power end forming described backlight source driving circuit altogether and be connected to ground;
The outfan of described power source protective module connects the input of described circuit protection module, the outfan of described circuit protection module connects the input of described current control module, the power end of the outfan of described current control module and described driving module connects the positive output end forming described backlight source driving circuit altogether, described driving module has drive end, the negative output terminal that drive end is described backlight source driving circuit of described driving module;
Described circuit protection module realizes break-make for the size of the voltage exported according to described power module and electric current;
The electric current of described driving module output is not more than the default operating current of described backlight source module.
2. backlight source driving circuit as claimed in claim 1, it is characterised in that described current control module includes:
First diode, the second diode and the 3rd diode;
The negative electrode of described first diode connects the anode of described second diode, the negative electrode of described second diode connects the anode of described 3rd diode, the input of described first diode is the input of described current control module, and the anode of described 3rd diode is the input of described current control module.
3. backlight source driving circuit as claimed in claim 1, it is characterised in that described current control module includes:
5th diode, the 6th diode and the 12nd resistance;
The negative electrode of described 5th diode connects the anode of described 6th diode, the negative electrode of described 6th diode connects the first end of described 12nd resistance, the input of described 5th diode is the input of described current control module, and the second end of described 12nd resistance is the input of described current control module.
4. backlight source driving circuit as claimed in claim 1, it is characterised in that described circuit protection module includes:
Second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the second electric capacity, the 3rd electric capacity, NMOS tube, IGCT, the 4th diode, TVS pipe and current sample module;
First end of described second resistance, the anode of described second electric capacity, first end of described 3rd resistance and the drain electrode of described NMOS tube connect the input forming described circuit protection module altogether, second end of described 3rd resistance and the first end of described 4th resistance are connected to the grid of described NMOS tube altogether, second end of the second end of described second resistance and described 4th resistance is connected to the anode of described IGCT altogether, the negative electrode of described IGCT connects the first end of described 6th resistance, second end of described 6th resistance and the anode of described 4th diode are connected to the anode of described TVS pipe altogether, first end of the gate pole of described IGCT and described 7th resistance is connected to the negative electrode of described 4th diode altogether, first end of the negative electrode of described TVS pipe and described 3rd electric capacity is connected to the first end of described 5th resistance altogether, second end of described 5th resistance, described second end of the 7th resistance and the source electrode of described NMOS tube are connected to the input of described current sample module altogether, the outfan of described current sample module is the outfan of described circuit protection module, the negative electrode of described second electric capacity, described second end of the 3rd electric capacity and the negative electrode of described IGCT are connected to ground altogether.
5. backlight source driving circuit as claimed in claim 1, it is characterised in that described driving module includes:
First resistance, switch, the first electric capacity and backlight driver chip;
The power end of described backlight driver chip and drive end are power end and the drive end of described driving module respectively, first end arranging end and described first resistance of described backlight driver chip is connected to the first end of described switch altogether, first end of the second end of described switch and described first electric capacity is connected to the power end of described backlight driver chip altogether, the test lead of described backlight driver chip and earth terminal are connected to the second end of ground, the second end of described first resistance and described first electric capacity altogether and are connected to ground altogether.
6. backlight source driving circuit as claimed in claim 1, it is characterised in that described backlight source driving circuit also includes the 7th diode;
The negative electrode of described 7th diode connects the positive pole of described power module, and the anode of described 7th diode is the second positive power source terminal of described backlight source driving circuit.
7. backlight source driving circuit as claimed in claim 1, it is characterised in that described backlight source driving circuit also includes critesistor;
Described critesistor is serially connected with between the outfan of described power source protective module and the input of described circuit protection module; first end of described critesistor connects the outfan of described power source protective module, and the second end of described critesistor connects the input of described circuit protection module.
8. a mobile terminal, including backlight source module, it is characterised in that described mobile terminal includes the backlight source driving circuit described in any one of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610056545.3A CN105682321A (en) | 2016-01-25 | 2016-01-25 | Backlight driving circuit and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610056545.3A CN105682321A (en) | 2016-01-25 | 2016-01-25 | Backlight driving circuit and mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105682321A true CN105682321A (en) | 2016-06-15 |
Family
ID=56303758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610056545.3A Pending CN105682321A (en) | 2016-01-25 | 2016-01-25 | Backlight driving circuit and mobile terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105682321A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110658404A (en) * | 2019-09-30 | 2020-01-07 | 中国联合网络通信集团有限公司 | Terminal testing device and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140145635A1 (en) * | 2012-11-29 | 2014-05-29 | Power Forest Technology | Power converter control circuit |
| CN104684188A (en) * | 2013-12-03 | 2015-06-03 | 深圳市海洋王照明工程有限公司 | LED (Light-emitting Diode) drive circuit and mine explosion-proof lamp |
-
2016
- 2016-01-25 CN CN201610056545.3A patent/CN105682321A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140145635A1 (en) * | 2012-11-29 | 2014-05-29 | Power Forest Technology | Power converter control circuit |
| CN104684188A (en) * | 2013-12-03 | 2015-06-03 | 深圳市海洋王照明工程有限公司 | LED (Light-emitting Diode) drive circuit and mine explosion-proof lamp |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110658404A (en) * | 2019-09-30 | 2020-01-07 | 中国联合网络通信集团有限公司 | Terminal testing device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104037884A (en) | Charging method and device integrating quick-charging rules and USB charging rules | |
| CN102255345B (en) | Double-battery powered circuit | |
| CN204681253U (en) | A kind of electric power system and LED power | |
| CN209593069U (en) | Management of charging and discharging circuit and charger | |
| CN104780684A (en) | DC conversion LED drive circuit | |
| CN104768303A (en) | Led drive control circuit | |
| KR20200030099A (en) | Charging status indicator switching circuit | |
| CN206804838U (en) | Wireless battery logging | |
| CN105682321A (en) | Backlight driving circuit and mobile terminal | |
| CN205051402U (en) | Lithium batteries control circuit | |
| CN204681625U (en) | Input feedforward LED drive circuit | |
| CN206060166U (en) | A kind of point is mended adjuster circuit | |
| CN204119025U (en) | A kind of linear voltage dropping circuit for battery system | |
| CN205646852U (en) | Power route dynamic management circuit | |
| CN104684188B (en) | A kind of LED drive circuit and flameproof luminaire | |
| CN206977072U (en) | A kind of band overcharges protection and battery status instruction charging circuit | |
| CN202663604U (en) | Led lamp driving circuit | |
| CN207184441U (en) | A kind of short circuit and overload protecting circuit for being used to isolate small-power numeral output | |
| CN207652724U (en) | A kind of lamps and lanterns with fan | |
| CN106973479B (en) | Switching circuit system for intelligent lamp and switching method thereof | |
| CN104518541A (en) | Reverse-connection-preventive charging circuit and lamp | |
| CN207652726U (en) | A kind of emergent lamp power circuits of LED | |
| CN108565908A (en) | When a kind of charging of lithium battery in disablement device large power-consuming equipment circuit | |
| CN204119573U (en) | 5w led drive circuit | |
| CN103779839A (en) | Automatic opening type starting circuit powered up by rechargeable battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160615 |
|
| WD01 | Invention patent application deemed withdrawn after publication |