CN201467526U - Multi-channel white-light LED driver and LED illuminator - Google Patents
Multi-channel white-light LED driver and LED illuminator Download PDFInfo
- Publication number
- CN201467526U CN201467526U CN2009200735623U CN200920073562U CN201467526U CN 201467526 U CN201467526 U CN 201467526U CN 2009200735623 U CN2009200735623 U CN 2009200735623U CN 200920073562 U CN200920073562 U CN 200920073562U CN 201467526 U CN201467526 U CN 201467526U
- Authority
- CN
- China
- Prior art keywords
- driver
- led
- pin
- input end
- links
- 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 - Lifetime
Links
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
The utility model discloses a multi-channel white-light LED driver, which comprises a band-gap reference module, a current reference module, a multi-channel current sink and an enable pin, wherein the input end of the band-gap reference module is connected with a voltage input end, the output end of the band-gap reference module is connected with the first input end of the current reference module, the output end of the current reference module is connected with the first input end of the current sink, the second input ends of the current reference module and the current sink are connected with the voltage input end, and a plurality of LED pins are led out of the output end of the multi-channel current sink. The utility model also discloses an LED illuminator using the driver. By means of highly stable negative feedback loop control and the accurately matched current sink structure, the utility model realizes the accurate current matching between multiple channels of LEDs.
Description
Technical field
The utility model relates to a kind of led driver and LED lighting device, the LED lighting device of particularly a kind of low pressure spill current trap type multichannel white light LEDs driver and this driver of employing.
Background technology
Along with the display sizes of portable digital equipment is increasing, resolution and brightness improve constantly, and the back lighting of display becomes the ultimate challenge of the portable set energy.LED (Light EmittingDiode, light-emitting diode) has the characteristics of high-efficient energy-saving environment friendly, its volume is little, caloric value is low (non-thermal radiation), power consumption little (low-voltage, low current starting), life-span long (more than 10,000 hours), reaction speed fast (can at high-frequency operation), environmental protection (shatter-proof, shock-resistant be difficult for broken, discarded object is recyclable, do not pollute) but the planar package easy exploiting becomes advantages such as compact product.Just because of white light emitting diode (LED) has so big development prospect, the more and more white light emitting diodes (LED) that adopt of portable digital equipment are done backlight now.Therefore, white light emitting diode (LED) is used reliably drive scheme efficiently, take simple control strategy, the high white light LEDs chip for driving of exploitation integrated level has also become a power management chip hot issue now.
Portable equipment now is in the increasing while of function, and is also increasing to the demand of power, and the efficient that promotes led driver can effectively be alleviated the power supply design of portable cell; From application point, because the difference of portable equipment difference in functionality demand need come the luminosity of corresponding control LED according to the concrete working condition of portable equipment, and further realize energy-efficient purpose.On the other hand, according to the characteristic that the characteristics and the LED luminous intensity of back lighting itself is directly proportional with forward current, the backlight drive of display requires to have between each LED the precise current coupling.
The utility model content
It is a kind of simple in structure that the purpose of this utility model is to provide, and lower-cost high efficiency, realizes that each paths of LEDs electric current accurately mates and have the white light LEDs driver of brightness control function.
The utility model solves above-mentioned technical problem by following technical proposals:
A kind of multichannel white light LEDs driver, its characteristics are, it comprises: a band is a base modules, one current reference module, a multichannel current sink and an Enable Pin, wherein this band is that the input of base modules links to each other with voltage input end, this band is that the output of base modules links to each other with the first input end of this current reference module, the output of this current reference module links to each other with the first input end of this current sink, second input of this current reference module and second input of this current sink are connected to this voltage input end, and the output of this multichannel current sink is drawn a plurality of LED pins.
Preferably, this band is that base modules and this current reference inside modules also comprise a temperature-compensation circuit respectively.
Preferably, this current sink comprises an amplifier, one adjusts pipe, wherein the in-phase input end of this amplifier connects reference voltage input terminal, this amplifier's inverting input links to each other with the source electrode of this adjustment pipe, the output of this amplifier links to each other with the grid of this adjustment pipe, and the LED pin is drawn in the drain electrode of this adjustment pipe.
Preferably, described driver also comprises a simulation ground pin and a Power Groud pin, this simulation ground pin and this Power Groud pin common ground.
Preferably, this driver also comprises a undervoltage lockout circuit and a thermal-shutdown circuit, and the input of this undervoltage lockout circuit and this thermal-shutdown circuit all is connected with voltage input end.
Preferably, described multichannel is single channel, binary channels, triple channel or four-way.
The utility model also provides a kind of LED lighting device, its characteristics are that it comprises aforesaid multichannel white light LEDs driver, and wherein the positive pole of LED links to each other with the LED working power, the negative pole of LED is connected to the LED pin of this driver, and the voltage input end of this driver is connected to power supply.
Preferably, the Enable Pin pin of this driver links to each other with the voltage input end pin.
Preferably, the Enable Pin pin of this driver links to each other with a logic level.
Preferably, the Enable Pin pin of this driver links to each other with the pulse width modulation module, and this pulse width modulation module is used for the light intensity regulating of LED, and its regulating degree is directly proportional with the duty ratio of the control signal of this pulse width modulation module.
Positive progressive effect of the present utility model is:
1, by the feedback loop control of high bandwidth high stability and the current sink structure of accurately mating, the forward current of image current benchmark control LED multi-path makes LED multi-path realize currents match accurately.
2, have the voltage difference of lower LED negative pole, make this driver can adapt to lower light-emitting diode operating voltage (V to ground
LED) and have higher driving efficient.
3, (Pulse Width Modulation, PWM) the adjusting control signal of module is controlled Enable Pin (EN) pin of led driver, can realize the linear regulation of LED multi-path luminous intensity by pulse width modulation.
Description of drawings
Fig. 1 is the application schematic diagram of the utility model current sink type 4 passage white light LEDs drivers.
Fig. 2 is the internal module structured flowchart of the utility model current sink type 4 passage white light LEDs drivers.
Fig. 3 is the current reference modular structure figure of the utility model current sink type 4 passage white light LEDs drivers.
Fig. 4 is the single channel current sink structure chart of the utility model current sink type 4 passage white light LEDs drivers.
Embodiment
Below with reference to accompanying drawing 1-4, provide an embodiment of the present utility model, and described in detail, so that those skilled in the art is easier to understand architectural feature of the present utility model and function characteristics, rather than be used for limiting scope of the present utility model.
With reference to figure 2, be the internal module structured flowchart of the utility model current sink type 4 passage white light LEDs drivers.As shown in Figure 2, this driver is an example with 4 passages, it comprises: a band is a base modules 201, one current reference module 202, a current sink 203 and an Enable Pin, wherein this band is that the input of base modules 201 links to each other with voltage input end Vin, this band is that the output of base modules 201 links to each other with the first input end of this current reference module 202, the output of this current reference module 202 links to each other with the first input end of this current sink 203, second input of this current reference module 202 and second input of this current sink 203 are connected to this voltage input end Vin, and the output of this current sink is drawn 4 LED pins 204.When this drive operation, the operating voltage of driver is provided by voltage input end Vin, the band-gap reference module produces accurate reference voltage to produce current reference, this current reference is by the current sink mirror-image structure of matched, this current reference is mirrored in each road current sink, luminous to drive 4 paths of LEDs, obtain accurately and the LED electric current of matched.Preferably, this driver also comprises a undervoltage lockout circuit 205 and a thermal-shutdown circuit 206, and the input of this undervoltage lockout circuit and this thermal-shutdown circuit all is connected with voltage input end.This undervoltage lockout circuit helps to stablize input voltage vin.
With reference to figure 3, current reference modular structure figure for the utility model current sink type 4 passage white light LEDs drivers. shown in the frame of broken lines of Fig. 3, be the circuit that produces current reference (Iref), the loop characteristics of its high-gain and fuse regulating circuit make current reference (Iref) have very high precision.
Wherein, this band is that base modules 201 and these current reference module 202 inside also comprise a temperature-compensation circuit (figure does not show) respectively, makes current reference (Iref) have good temperature characterisitic.
With reference to figure 4, be the single channel current sink structure chart of the utility model current sink type 4 passage white light LEDs drivers.This current sink comprises an amplifier A2, one adjusts pipe M3, wherein the in-phase input end of this amplifier A2 meets voltage input end Vin, the inverting input of this amplifier A2 links to each other with the source electrode of this adjustment pipe M3, the output of this amplifier A2 links to each other with the grid of this adjustment pipe M3, and the LED pin is drawn in the drain electrode of this adjustment pipe M3.By the feedback loop control of high bandwidth high stability and the current sink structure of accurately mating, the forward current of image current benchmark (Iref) control 4 paths of LEDs makes four paths of LEDs realize currents match accurately.Adjust pipe (M3) drain-source voltage (V
DS) adaptability can reduce the LED current error that causes because of each paths of LEDs forward voltage drop difference greatly.
With reference to figure 1, be the application schematic diagram of the utility model current sink type 4 passage white light LEDs drivers.This driver is used for a LED lighting device, this LED lighting device comprises aforesaid low pressure spill current trap type multichannel white light LEDs driver, wherein the positive pole of LED links to each other with the LED working power, the negative pole of LED is connected to the LED pin of this driver, the voltage input end of this driver can directly be connected to power supply, perhaps be connected to power supply by a capacitor C, Vin provides the operating voltage of this driver, V
LEDThe operating voltage of light-emitting diode is provided.Described driver also comprises a simulation ground pin and a Power Groud pin, this simulation ground pin and this Power Groud pin common ground.
When not needing the LED luminous intensity regulated, the utilogic level drives this driver Enable Pin (EN) pin, or directly Enable Pin (EN) pin is linked to each other with the Input voltage terminal pin, to realize the controlled function that enables of driver.
When needs are regulated the LED luminous intensity, the Enable Pin pin of this driver links to each other with the pulse width modulation module, this pulse width modulation module is used for the light intensity regulating of LED, and its regulating degree is directly proportional with the duty ratio of the control signal of this pulse width modulation module.
Present embodiment is an example with the four-way led driver, and this driver also can be single channel, binary channels, triple channel.
Though more than described embodiment of the present utility model, but those skilled in the art is to be understood that, these only illustrate, and under the prerequisite that does not deviate from principle of the present utility model and essence, can make numerous variations or modification to these execution modes.Therefore, protection range of the present utility model is limited by appended claims.
Claims (10)
1. multichannel white light LEDs driver, it is characterized in that, it comprises: a band is a base modules, one current reference module, a multichannel current sink and an Enable Pin, wherein this band is that the input of base modules links to each other with voltage input end, this band is that the output of base modules links to each other with the first input end of this current reference module, the output of this current reference module links to each other with the first input end of this current sink, second input of this current reference module and second input of this current sink are connected to this voltage input end, and the output of this multichannel current sink is drawn a plurality of LED pins.
2. multichannel white light LEDs driver as claimed in claim 1 is characterized in that, this band is that base modules and this current reference inside modules also comprise a temperature-compensation circuit respectively.
3. multichannel white light LEDs driver as claimed in claim 1, it is characterized in that, this current sink comprises an amplifier, one adjusts pipe, wherein the in-phase input end of this amplifier connects reference voltage input terminal, this amplifier's inverting input links to each other with the source electrode of this adjustment pipe, and the output of this amplifier links to each other with the grid of this adjustment pipe, and the LED pin is drawn in the drain electrode of this adjustment pipe.
4. multichannel white light LEDs driver as claimed in claim 1 is characterized in that, described driver also comprises a simulation ground pin and a Power Groud pin, this simulation ground pin and this Power Groud pin common ground.
5. multichannel white light LEDs driver as claimed in claim 1 is characterized in that this driver also comprises a undervoltage lockout circuit and a thermal-shutdown circuit, and the input of this undervoltage lockout circuit and this thermal-shutdown circuit all is connected with voltage input end.
6. as any described multichannel white light LEDs driver of claim 1-5, it is characterized in that described multichannel is single channel, binary channels, triple channel or four-way.
7. LED lighting device, it is characterized in that it comprises multichannel white light LEDs driver as claimed in claim 1, wherein the positive pole of LED links to each other with the LED working power, the negative pole of LED is connected to the LED pin of this driver, and the voltage input end of this driver is connected to power supply.
8. LED lighting device as claimed in claim 7 is characterized in that, the Enable Pin pin of this driver links to each other with the voltage input end pin.
9. LED lighting device as claimed in claim 7 is characterized in that, the Enable Pin pin of this driver links to each other with a logic level.
10. LED lighting device as claimed in claim 7, it is characterized in that, the Enable Pin pin of this driver links to each other with the pulse width modulation module, this pulse width modulation module is used for the light intensity regulating of LED, and its regulating degree is directly proportional with the duty ratio of the control signal of this pulse width modulation module output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200735623U CN201467526U (en) | 2009-06-09 | 2009-06-09 | Multi-channel white-light LED driver and LED illuminator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200735623U CN201467526U (en) | 2009-06-09 | 2009-06-09 | Multi-channel white-light LED driver and LED illuminator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201467526U true CN201467526U (en) | 2010-05-12 |
Family
ID=42394870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200735623U Expired - Lifetime CN201467526U (en) | 2009-06-09 | 2009-06-09 | Multi-channel white-light LED driver and LED illuminator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201467526U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102256421A (en) * | 2011-07-28 | 2011-11-23 | 林万炯 | High-precision multipath LED (light-emitting diode) current-equalizing circuit |
| CN109473957A (en) * | 2018-12-24 | 2019-03-15 | 南宁职业技术学院 | Current sink circuit |
-
2009
- 2009-06-09 CN CN2009200735623U patent/CN201467526U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102256421A (en) * | 2011-07-28 | 2011-11-23 | 林万炯 | High-precision multipath LED (light-emitting diode) current-equalizing circuit |
| CN109473957A (en) * | 2018-12-24 | 2019-03-15 | 南宁职业技术学院 | Current sink circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102917516B (en) | Method for resolving excess temperature of constant current driving chips and light-emitting diode (LED) lamp bar driving circuit | |
| CN101636021A (en) | LED constant current driving circuit | |
| CN202404873U (en) | Constant voltage and constant current drive circuit of LED display screen | |
| CN102543011A (en) | Liquid crystal backlight drive system with adjustable brightness | |
| CN101990347A (en) | Driving and dimming method suitable for alternating current LEDs | |
| CN102917518B (en) | Realize the method for LED lamp bar current multiplication and the drive circuit of correspondence thereof | |
| CN202565545U (en) | Multipath light-adjustable constant-current output LED drive circuit | |
| CN202514136U (en) | Light emitting diode (LED) driving chip capable of dimming and driving circuit | |
| CN202268152U (en) | Backlight constant-current and constant-voltage driving circuit for display screen | |
| CN202334999U (en) | LED (light emitting diode) driving device | |
| CN201467526U (en) | Multi-channel white-light LED driver and LED illuminator | |
| CN204559932U (en) | Controller applied to street lamp | |
| CN201937925U (en) | LED constant current driver with function of voltage reduction | |
| CN1913736A (en) | Current source circuit of multiplex parallel LED driven by one reference current | |
| CN203151813U (en) | LED light source drive circuit | |
| CN202551459U (en) | LED (Light Emitting Diode) driving power supply module for silicon controlled regulating circuit | |
| CN105430830A (en) | LED controller and method thereof | |
| CN201403226Y (en) | LED backlight driving device | |
| CN102665323B (en) | Driving method, driving circuit and driving method of light emitting diode string | |
| CN202120579U (en) | Brightness adjustable liquid crystal backlight driving system | |
| CN201328203Y (en) | Dimmable three-channel large-power LED constant-flow driver module | |
| CN202587529U (en) | Pulse width modulation (PWM) dimming circuit for high-voltage direct current centralized power supply light emitting diode (LED) constant current source | |
| CN203537605U (en) | LED multi-path current sharing circuit | |
| CN202696962U (en) | Light emitting diode (LED) driving power supply | |
| CN201854468U (en) | Light-changing alternating current LED lamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100512 |