CN203242309U - LED backlight module constant-current driving device - Google Patents
LED backlight module constant-current driving device Download PDFInfo
- Publication number
- CN203242309U CN203242309U CN 201320060033 CN201320060033U CN203242309U CN 203242309 U CN203242309 U CN 203242309U CN 201320060033 CN201320060033 CN 201320060033 CN 201320060033 U CN201320060033 U CN 201320060033U CN 203242309 U CN203242309 U CN 203242309U
- Authority
- CN
- China
- Prior art keywords
- module
- voltage
- current
- led
- constant
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to an LED backlight module constant-current driving device, which comprises a voltage conversion module, a voltage feedback module, a backlight adjusting module and a constant-current control module. The voltage conversion module generates a direct current voltage through a fly-back topologic structure. The direct current voltage is used for an LED backlight driver to turn on LED light bars. By controlling the on-off of an MOS tube, the constant-current control module controls a current flowing through the LED light bars driven by the LED backlight driver and makes the current no more than the maximum current the LEDs can bear. The voltage feedback module achieves control on the output voltage of the voltage conversion module through negative feedback so as to make the output voltage stably within a reasonable range. The backlight adjusting module controls the voltage conversion module through enable signals and brightness adjusting signals. When in use, the LED backlight module constant-current driving circuit directly generates the direct current voltage driving the LED light bars after being rectified and filtered. The LED backlight module constant-current driving device which has the characteristics of simple circuit, high efficiency, and low cost can precisely and flexibly adjust the backlight current.
Description
Technical field
The utility model relates to a kind of improvement of used as television LED-backlit module constant current driving device, relates in particular to a kind of extensibility Multifunctional LED backlight module constant current driving device strong, simple in structure.
Background technology
LED is current driving apparatus, and its brightness is directly proportional with forward current, and for guaranteeing the efficient uniformly light-emitting of LED, its drive source should be constant current output.Along with flat panel TV develops towards slimming, adopt LED to become a kind of trend as backlight.A lot of driving LED IC backlight occurred in the market, but price is higher, as shown in Figure 1; In addition, these IC need DC power supply, have caused the complicacy of whole power-supply system; Because will be through two-stage conversion, namely alternating current converts first the direct current that IC needs to, converts the DC voltage of driving LED lamp bar under IC control to again, and the conversion of every one-level has energy loss, causes the circuit whole efficiency not high, and is too complicated.
The utility model content
The utility model purpose is the Multifunctional LED backlight module constant current driving device that provides a kind of extensibility strong, simple in structure in order to overcome the deficiencies in the prior art.
For achieving the above object, the technical solution adopted in the utility model is: a kind of LED-backlit module constant current driving device comprises voltage transformation module, Voltage Feedback module, adjusting module backlight and constant-current control module; Described voltage transformation module produces DC voltage by the reverse exciting topological framework, and described DC voltage is in order to drive the lightening LED lamp bar to LED-backlit; Described constant-current control module is controlled the electric current that flows through the LED lamp bar that LED-backlit drives by the break-make of control metal-oxide-semiconductor, makes its electric current be no more than the maximum current that LED can bear; Described Voltage Feedback module realizes control to the output voltage of voltage transformation module by negative feedback, to reach the purpose of output voltage stabilization in suitable scope; Described adjusting module backlight is controlled voltage transformation module by enable signal and brightness adjusting signal.
Switching when preferably, described enable signal can be by duty backlight when the high level and low level between this two states of closed condition backlight realizes regulating action.
Preferably, described brightness adjusting signal is pwm signal, adjusts brightness backlight with the size of its dutycycle.
Because the utilization of technique scheme, the utility model compared with prior art has following advantages:
The described Novel heat-conducting material of the utility model scheme is because a kind of LED-backlit module constant current driving device comprises voltage transformation module, Voltage Feedback module, adjusting module backlight and constant-current control module; Described voltage transformation module produces DC voltage by the reverse exciting topological framework, and described DC voltage is in order to drive the lightening LED lamp bar to LED-backlit; Described constant-current control module is controlled the electric current that flows through the LED lamp bar that LED-backlit drives by the break-make of control metal-oxide-semiconductor, makes its electric current be no more than the maximum current that LED can bear; Described Voltage Feedback module realizes control to the output voltage of voltage transformation module by negative feedback, to reach the purpose of output voltage stabilization in suitable scope; Described adjusting module backlight is controlled voltage transformation module by enable signal and brightness adjusting signal.
Switching when preferably, described enable signal can be by duty backlight when the high level and low level between this two states of closed condition backlight realizes regulating action.
Preferably, described brightness adjusting signal is pwm signal, adjusts brightness backlight with the size of its dutycycle.
Description of drawings
Below in conjunction with accompanying drawing technical solutions of the utility model are described further:
Accompanying drawing 1 is the fundamental diagram of the LED-backlit module constant current driving device of prior art;
Accompanying drawing 2 is the fundamental diagram of LED-backlit module constant current driving device described in the utility model;
Accompanying drawing 3 is the voltage transformation module circuit diagram of LED-backlit module constant current driving device described in the utility model;
Accompanying drawing 4 is the Voltage Feedback module circuit diagram of LED-backlit module constant current driving device described in the utility model;
Accompanying drawing 5 is the adjusting module circuit diagram backlight of LED-backlit module constant current driving device described in the utility model;
Accompanying drawing 6 be LED-backlit module constant current driving device described in the utility model constant-current control module in current control circuit figure;
Accompanying drawing 7 be LED-backlit module constant current driving device described in the utility model constant-current control module in short-circuit protection circuit figure;
Embodiment
The utility model is described in further detail below in conjunction with drawings and the specific embodiments.
Such as the described a kind of LED-backlit module constant current driving device of the present utility model of accompanying drawing 2-7, comprise voltage transformation module, Voltage Feedback module, adjusting module backlight and constant-current control module; Described voltage transformation module produces DC voltage by the reverse exciting topological framework, and described DC voltage is in order to drive the lightening LED lamp bar to LED-backlit; Described constant-current control module is controlled the electric current that flows through the LED lamp bar that LED-backlit drives by the break-make of control metal-oxide-semiconductor, makes its electric current be no more than the maximum current that LED can bear; Described Voltage Feedback module realizes control to the output voltage of voltage transformation module by negative feedback, to reach the purpose of output voltage stabilization in suitable scope; Described adjusting module backlight is controlled voltage transformation module by enable signal and brightness adjusting signal; Switching when described enable signal can be by duty backlight when the high level and low level between this two states of closed condition backlight realizes regulating action; Described brightness adjusting signal is pwm signal, adjusts brightness backlight with the size of its dutycycle.
LED-backlit module constant current driving device described in the utility model is in the process of work, as shown in Figure 3, described voltage transformation module produces the needed DC voltage of lightening LED lamp bar, the direct current that produces is compressed into the processing of superpotential feedback module, with output voltage stabilization in suitable scope; As shown in Figure 4, the Voltage Feedback module is in the process of specific works, when output voltage raises, the voltage that drops on the R905 upper end also can raise, so that the conducting heighten degree of AS431, the electric current that flows through on the luminotron raises, electric current on the corresponding light-receiving tube also can raise, the dutycycle of LD7523 chip internal driving pwm signal will be less, so just impel main control chip output energy still less, output voltage is reduced, reach degenerative effect, if otherwise the output voltage reduction raises output voltage by control loop; As shown in Figure 5, adjusting module backlight drives LED-backlit and has carried out the control of enable signal and brightness adjusting signal; Described constant-current control module is controlled the electric current that flows through LED lamp bar by the break-make of control metal-oxide-semiconductor, makes its electric current be no more than the setting that LED can bear, comprising the Current Control to LED lamp bar as shown in Figure 6; The short-circuit protection to LED lamp bar as shown in Figure 7; Metal-oxide-semiconductor is the current-controlled switch of LED lamp bar, closes when electric current reaches upper limit switch.Sample resistance detects the electric current that flows through LED lamp bar, and compares with the form of voltage and the reference voltage of TL431 inside, when sampling voltage is higher than reference voltage, the TL431 conducting is drawn ground to the metal-oxide-semiconductor G utmost point, metal-oxide-semiconductor is closed, cut off lamp current, reach the purpose of control lamp current.
LED-backlit module constant current driving device described in the utility model no longer need to convert via two-stage in the process of using, but behind rectifying and wave-filtering, directly produce the DC voltage of driving LED lamp bar, overcome that the function that exists in the prior art is few, poor expandability and low, the baroque defective of conversion efficiency; Simple circuit, efficient is high, and cost is low, can accurately adjust flexibly back facet current, and control provides an ideal selection to LED-backlit.
Below only be concrete exemplary applications of the present utility model, protection domain of the present utility model is not constituted any limitation.All employing equivalents or equivalence are replaced and the technical scheme of formation, all drop within the utility model rights protection scope.
Claims (2)
1. a LED-backlit module constant current driving device is characterized in that: comprise voltage transformation module, Voltage Feedback module, adjusting module backlight and constant-current control module; Described voltage transformation module produces DC voltage by the reverse exciting topological framework, and described DC voltage is in order to drive the lightening LED lamp bar to LED-backlit; Described constant-current control module is controlled the electric current of the LED lamp bar that flows through the LED-backlit driving by the break-make of control metal-oxide-semiconductor; Described Voltage Feedback module realizes control to the output voltage of voltage transformation module by negative feedback; Described adjusting module backlight is controlled voltage transformation module by enable signal and brightness adjusting signal.
2. LED-backlit module constant current driving device according to claim 1, it is characterized in that: described brightness adjusting signal is pwm signal, adjusts brightness backlight with the size of its dutycycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320060033 CN203242309U (en) | 2013-02-03 | 2013-02-03 | LED backlight module constant-current driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320060033 CN203242309U (en) | 2013-02-03 | 2013-02-03 | LED backlight module constant-current driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203242309U true CN203242309U (en) | 2013-10-16 |
Family
ID=49319581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320060033 Expired - Fee Related CN203242309U (en) | 2013-02-03 | 2013-02-03 | LED backlight module constant-current driving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203242309U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103137079A (en) * | 2013-02-03 | 2013-06-05 | 苏州市职业大学 | Constant current driving device of light-emitting diode (LED) backlight module |
-
2013
- 2013-02-03 CN CN 201320060033 patent/CN203242309U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103137079A (en) * | 2013-02-03 | 2013-06-05 | 苏州市职业大学 | Constant current driving device of light-emitting diode (LED) backlight module |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101848577B (en) | LED driving system and driving method | |
| CN202353859U (en) | Controllable silicon light regulation device and illuminating system | |
| CN105322803A (en) | Constant-voltage and constant-current synchronous output power supply and television | |
| CN203289702U (en) | A backlight power supply circuit, a power supply apparatus, and a television set | |
| CN103280190A (en) | Backlight driving circuit, liquid crystal display device and backlight driving method | |
| CN101626652A (en) | Dimmable LED constant current source driver with wide voltage range | |
| CN203618179U (en) | Voltage-stabilization dimmable LED (light emitting diode) driving power supply circuit | |
| CN103533707B (en) | Voltage-stabilization dimmable LED (light emitting diode) driving power supply circuit | |
| CN103345903A (en) | LED backlight system and display device | |
| CN103871371A (en) | LED (light-emitting diode) backlight driving circuit, backlight module and liquid crystal display device | |
| CN103137079A (en) | Constant current driving device of light-emitting diode (LED) backlight module | |
| CN204046890U (en) | The low-power consumption bluetooth light adjusting system driven based on high-voltage linear LED and desk lamp with dimmer switch | |
| CN201479432U (en) | Dimmable LED constant current source driver with wide voltage range | |
| CN102404921A (en) | Output current adjustable intelligent constant current power supply device | |
| CN203242309U (en) | LED backlight module constant-current driving device | |
| CN104780644B (en) | A kind of Novel constant-flow voltage stabilizing inverse-excitation type LED drive power | |
| CN106354075A (en) | Control circuit of remote controller with backlight screen | |
| CN105307305A (en) | LED power supply control device and TV set | |
| CN202979393U (en) | Light-intensity-adjustable LED tunnel lamp with automatic over-temperature protection | |
| CN205611001U (en) | Linear constant current PWM optoelectronic isolation receiving terminal of high pressure | |
| CN201893106U (en) | Driving control circuit of light emitting diode (LED) back light source | |
| CN203340386U (en) | Drive power supply of infrared remote control stepless dimming band night lamp | |
| CN101394135A (en) | Control system and controller power source for electric appliance | |
| CN204180333U (en) | The multi-channel LED constant-current dimming controller of DC centrally connected power supply | |
| CN202261993U (en) | Light-adjustable constant-current driver for light emitting diode (LED) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131016 Termination date: 20140203 |