CN205566730U

CN205566730U - LED driver chip

Info

Publication number: CN205566730U
Application number: CN201620240235.2U
Authority: CN
Inventors: 林浩; 郭王瑞; 林丰成
Original assignee: Shenzhen Taiqing Microelectronics Technology Co Ltd
Current assignee: Shenzhen Taiqing Microelectronics Technology Co Ltd
Priority date: 2016-03-25
Filing date: 2016-03-25
Publication date: 2016-09-07
Anticipated expiration: 2026-03-25

Abstract

The utility model discloses a LED driver chip, the engine oil -gas separator comprises a housin, encapsulate and adjust integrated circuit in the inside LED drive of casing, set up the power pin on the casing, the pin is adjusted to ground connection pin and RGB grey level, integrated circuit and power pin are adjusted in the LED drive, the pin is adjusted to the RGB grey level, ground connection pin electricity is connected, the power pin is used for inputing signal battery and LED drive signal's composite signal, integrated circuit is with the LED drive signal after -separating in the LED drive, convert corresponding PWM pulse width modulation signal output to RGB grey level regulation pin to, this LED chip only needs a power cord can realize signal battery and LED drive signal's transmission for when product such as LED lamp strip, lamp decoration was applied to to this LED chip, the LED chip was the framework of establishing ties, and the system power of product is the current value of each node, makes the system power reduce, has reduced the use of copper foil, has reduced the cost of product.

Description

LED drive chip

Technical field

This utility model relates to LED technology field, particularly to a kind of LED drive chip.

Background technology

In the application of existing lamp decoration, soft or hard lamp bar, the power line of LED drive chip and holding wire are independent Separating, when LED quantity is bigger, the chip of cascade is the most more so that the pcb board of lamp bar and lamp decoration is walked Line is complicated；And usual chip at different levels is all connected in parallel on same power line so that the electricity of this power line Flow valuve is relatively big, thus the copper thickness of power supply cabling increases accordingly, product relatively costly.

Utility model content

Main purpose of the present utility model is to propose a kind of LED drive chip, it is intended to improves and reduces LED driving The production cost of the lamp decoration of chip application, lamp bar etc..

For achieving the above object, the LED drive chip that the utility model proposes, connected for control The RGB gray scale of LED, this LED drive chip includes housing, is packaged in the LED driving of enclosure interior Regulation integrated circuit, the power pins being arranged on housing, grounding pin and RGB gray scale regulation pin, Described LED drives regulation integrated circuit to be electrically connected with power pins, RGB gray scale regulation pin, grounding pin Connecing, described power pins is for the mixed signal of input power signal with LED drive signal, described LED After LED drive signal is separated by drive integrated circult, it is converted into corresponding pwm signal and exports to RGB Gray scale regulation pin.

Preferably, described LED drive regulation integrated circuit include power module, digital signal extraction module, Logic control module and PWM drive module, and the input of described power module is with described power pins even Connecing, the outfan of described power module drives with digital signal extraction module, Logic control module, PWM The power end of module connects, and the input of described digital signal extraction module is connected with described power pins, The outfan of described digital signal extraction module is connected with described Logic control module, described logic control mould The end that controls of block drives the input of module to be connected with described PWM, and described PWM drives the outfan of module It is connected with described RGB gray scale regulation pin.

Preferably, described LED drives regulation integrated circuit also to include under-voltage locking module and reference voltage Module, the input of described under-voltage locking module is connected with the outfan of described power module, described under-voltage Locking module outfan be connected with the control end of described power module, described reference voltage module be used for be Described under-voltage locking module provides internal reference voltage, when the electricity of the power supply signal that described power module exports Forcing down when described reference voltage, described power module stops as described digital signal extraction module, logic Control module, PWM drive module for power supply.

Preferably, described LED drives regulation integrated circuit also to include OTP module, described OTP module Including the memory element of the programming address for storing described LED drive chip, the reading of described memory element Write port is connected with the reading-writing port of described Logic control module.

Preferably, described OTP module also includes the benchmark electricity for calibrating described reference voltage inside modules The alignment unit of pressure, the outfan of described alignment unit is connected with the calibration terminal of described reference voltage module.

Preferably, described LED drives regulation integrated circuit also to include current offset module, and described electric current is inclined Put module to be connected between described power module and described PWM driving module.

Preferably, described LED drives regulation integrated circuit also to include clock module, described clock module Outfan is connected with the clock end of described Logic control module, when described Logic control module receives described Carrying out scaling down processing after the clock signal of clock module, output to described PWM drives module, controls described PWM drives the dutycycle of module.

Preferably, described LED drive integrated circult also includes diode string, the anode of described diode string End is connected with described grounding pin, and the cathode terminal of described diode string is connected with described power pins.

Preferably, the transmission of described driving signal uses DMX512 agreement to the mode of described power pins.

Technical solutions of the utility model by by the mixed signal of power supply signal and LED drive signal through power supply Pin is introduced to this LED chip, then LED is driven the valid data of digital signal by digital extraction module Section is transferred to Logic control module and processes after extracting, then control PWM and drive the pwm signal of module output Dutycycle, the Guan Bi ON time of switch of RGB gray scale regulation pin is adjusted, it is achieved to LED The regulation of RGB gray scale, thus, by technique scheme, this LED chip only needs a power line i.e. The transmission of power supply signal and LED drive signal can be realized so that this LED chip is applied to LED lamp bar, lamp During the products such as decorations, reduce the system power of the product such as LED lamp bar, lamp decoration, decrease the use of Copper Foil, Reduce the cost of product.

Accompanying drawing explanation

In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will The accompanying drawing used required in embodiment or description of the prior art is briefly described, it should be apparent that, Accompanying drawing in describing below is only embodiments more of the present utility model, for ordinary skill people From the point of view of Yuan, on the premise of not paying creative work, it is also possible to obtain according to the structure shown in these accompanying drawings Obtain other accompanying drawing.

Fig. 1 is the structural representation of this utility model LED drive chip one embodiment；

Fig. 2 is the internal circuit connection diagram in Fig. 1.

Drawing reference numeral illustrates:

Label	Title	Label	Title
				10	Housing	250	OTP module
20	LED drives regulation integrated circuit	251	Memory element
				30	RGB gray scale regulation pin	252	Alignment unit
VCC	Power pins	260	Current offset module
				GND	Grounding pin	270	Clock module
210	Power module	280	Diode
				220	Digital signal extraction module	290	Under-voltage locking module
230	Logic control module	291	Voltage reference module
				240	PWM drives module

The realization of this utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, do referring to the drawings into One step explanation.

Detailed description of the invention

Below in conjunction with the accompanying drawing in this utility model embodiment, to the technology in this utility model embodiment Scheme is clearly and completely described, it is clear that described embodiment is only of the present utility model one Section Example rather than whole embodiments.Based on the embodiment in this utility model, this area is general The every other embodiment that logical technical staff is obtained under not making creative work premise, broadly falls into The scope of this utility model protection.

It is to be appreciated that directional instruction in this utility model embodiment (such as upper and lower, left and right, It is forward and backward ...) it is only used for explanation phase under a certain particular pose (as shown in drawings) between each parts To position relationship, motion conditions etc., if this particular pose changes, then directionality indicates also Change the most therewith.

It addition, the description relating to " first ", " second " etc. in this utility model is only used for describing purpose, And it is not intended that indicate or imply its relative importance or the implicit number indicating indicated technical characteristic Amount.Thus, define " first ", the feature of " second " can be expressed or implicitly include at least one Individual this feature.It addition, the technical scheme between each embodiment can be combined with each other, but must be with Based on those of ordinary skill in the art are capable of, when conflicting or nothing occurs in the combination of technical scheme Will be understood that when method realizes that the combination of this technical scheme does not exists, the guarantor not required at this utility model Within the scope of protecting.

The utility model proposes a kind of LED drive chip.

Referring to figs. 1 through 2, Fig. 1 is the structural representation of this utility model LED drive chip one embodiment；Figure 2 is the internal circuit connection diagram in Fig. 1.

In this utility model embodiment, as described in Figure 1, this LED drive chip is used for controlling to be connected The RGB gray scale of LED, including housing 10, be packaged in the LED within housing 10 and drive regulation collection Become circuit 20, power pins VCC being arranged on housing 10, grounding pin GND and RGB gray scale Regulation pin 30, described LED drives regulation integrated circuit 20 to adjust with power pins VCC, RGB gray scale Joint pin 30, grounding pin GND electrical connection, described power pins VCC for input power signal with The mixed signal of LED drive signal, LED drive signal is separated by described LED drive integrated circult 20 After, it is converted into the output of corresponding pwm signal and regulates pin 30 to RGB gray scale.

The LED drive signal of technical solutions of the utility model is converted to use through LED drive integrated circult 20 In the digital signal of the RGB gray scale of regulation LED, this digital signal includes corresponding LED drive chip Address information and RGB gray scale regulation information, by serial mode input to power pins VCC, transmission Mode follows DMX512 agreement；This LED drive signal mixes with the power supply signal of this LED drive chip Forming 0-3.3V voltage signal after conjunction to input from power pins VCC, this mixed signal drives collection through LED Become circuit 20 to be separated from mixed signal by LED drive signal, and be converted into corresponding PWM letter Number output to RGB gray scale regulate pin 30, in order to regulate the brightness of connected LED.Thus, By such scheme, this LED drive chip only needs a power line can realize power supply signal to drive with LED The transmission of dynamic signal so that when this LED drive chip is applied to the product such as LED lamp bar, lamp decoration, LED Driving chip for series architecture, the system power of the product such as LED lamp bar, lamp decoration is the LED of each node The current value of driving chip, thus reduce the system power of product, decrease the use of Copper Foil, reduce The cost of product.

Specifically, as described in Figure 2, described LED drive regulation integrated circuit 20 include power module 210, Digital signal extraction module 220, Logic control module 230 and PWM drive module 240, described electricity The input of source module 210 is connected with described power pins VCC, the outfan of described power module 210 With the power end that digital signal extraction module 220, Logic control module 230, PWM drive module 240 Connecting, the input of described digital signal extraction module 220 is connected with described power pins VCC, described The outfan of digital signal extraction module 220 is connected with described Logic control module 230, described logic control The end that controls of molding block 230 drives the input of module 240 to be connected with described PWM, and described PWM drives The outfan of dynamic model block 240 is connected with described RGB gray scale regulation pin 30.

In the present embodiment, the input of power module 210 is connected with described power pins VCC, described The outfan of power module 210 and described digital signal extraction module 220, Logic control module 230, PWM The power end driving module 240 connects, and described power pins VCC is inputted by described power module 210 After power supply signal filtering voltage regulation processes, eliminating the noise signal of shake, output to described digital signal carries Delivery block 220, Logic control module 230, PWM drive the power end of module 240, for for above-mentioned Each functional module provides stable running voltage；In the present embodiment, the running voltage of each functional module is excellent Choosing uses 3.3V.

Further, the outfan of power module 210 also input with under-voltage locking module 290 is connected, defeated Go out stable voltage signal to under-voltage locking module 290.The outfan of described under-voltage locking module 290 and institute The control end stating power module 210 connects, and described reference voltage module 291 is used for as described under-voltage locking Module 290 provides internal reference voltage, when the voltage of the power supply signal of described power module 210 output is low When described reference voltage, described power module 210 stops as described digital signal extraction module 220, patrols Collect control module 230, PWM drives module 240 to power.

In the present embodiment, reference voltage module 291 provide reference voltage preferably employ 1.2V, i.e. when When the voltage signal of power module 210 output is less than 1.2V, now, under-voltage locking module will output one control Signal processed, to power module 210, makes power module 210 stop powering for other each functional modules.This state, This LED chip quits work, and regulates pin 30 without output to RGB gray scale.

Further, described LED drives regulation integrated circuit 20 also to include OTP module 250, described OTP module 250 includes that memory element 251 and alignment unit 252, described memory element 251 are used for preserving The programming address of described LED drive chip and calibration parameter, the reading-writing port of described memory element 251 with The reading-writing port of described Logic control module 230 connects；Described alignment unit 252 is used for calibrating described base Reference voltage within quasi-voltage module 291, the outfan of described alignment unit 252 and described benchmark electricity The calibration terminal of die block 291 connects.

Specifically, in memory element 251, the programming address of storage is generated by LED drive signal, in this reality Executing in example, this memory element 251 maximum can support 2048 addresses.When digital signal extraction module 220 After being separated by LED drive signal from mixed signal, it is transferred to Logic control module 230, logic Control module 230, according to the programming address in memory element 251, reads in LED drive signal further The data segment of corresponding RGB gray scale regulation signal, then be transferred to by the control end of Logic control module 230 PWM drives the input of module 240, and PWM drives module 240 to export the PWM of corresponding dutycycle Signal regulates pin 30 to RGB gray scale, and the LED connected is carried out light and shade regulation.

In the present embodiment, described RGB gray scale regulation pin 30 have R-red tone switch, G-green Color tone switch and B-blue color switch, drive mould by being arranged on power module 210 with PWM Current offset module 260 between block 240 carries out 100% current offset, PWM to above-mentioned tone switch The pwm signal driving module 240 to export duty ratio corresponding switchs to above three tone, thus controls every The open and close time of individual switch, then realize the regulation of RGB gray scale.

The reference voltage that Logic control module 230 will be saved in memory element 251 also by reading-writing port Calibration parameter read-in alignment unit 252 so that the calibration accuracy of reference voltage is ± 10%, by calibration Unit 252 can improve the degree of accuracy that under-voltage locking module 290 judges that LED chip is the most under-voltage, prevents Protection by mistake.

Further, described LED drives regulation integrated circuit 20 also to include clock module 270, time described The outfan of clock module 270 is connected with the clock end of described Logic control module 230, described logic control Module 230 carries out scaling down processing after receiving the clock signal of described clock module 270, output is to the most described PWM drives module 240, controls described PWM and drives the dutycycle of module 240.

Above-mentioned clock module 270 preferably employs crystal oscillator and realizes, and produces the clock signal of characteristic frequency to logic Control module 230, numeral signal extraction module 220 is passed by Logic control module 230 according to this clock signal The LED drive signal passed carries out scaling down processing, and control PWM drives module 240 to export correspondence and accounts for The pwm signal of empty ratio regulates pin 30 to RGB gray scale, it is achieved the RGB gray scale regulation of LED.

Further, described LED drive integrated circult 20 also includes diode string 280, described diode The anode tap of string 280 is connected with described grounding pin GND, the cathode terminal of described diode string 280 and institute State power pins VCC to connect.

In the present embodiment, generally grounding pin GND is connected as the output of this LED drive chip Input to next stage LED drive chip, it is achieved the cascade of LED drive chip；Utilize diode string Power pins VCC of the LED drive chip of every one-level and grounding pin GND voltage are clamped down on by 280 One fixed voltage value, in the present embodiment, preferably clamps down at 3.3V.

The foregoing is only preferred embodiment of the present utility model, not thereby limit of the present utility model specially Profit scope, every under inventive concept of the present utility model, in utilizing this utility model description and accompanying drawing The equivalent structure transformation of Rong Suozuo, or directly/be indirectly used in other relevant technical fields and be included in this In the scope of patent protection of utility model.

Claims

1. a LED drive chip, for controlling the RGB gray scale of the LED connected, it is characterized in that, including housing, the LED being packaged in enclosure interior drives regulation integrated circuit, the power pins being arranged on housing, grounding pin and RGB gray scale regulation pin, described LED drives regulation integrated circuit and power pins, RGB gray scale regulation pin, grounding pin electrically connects, described power pins is for the mixed signal of input power signal with LED drive signal, after LED drive signal is separated by described LED drive integrated circult, it is converted into the output of corresponding pwm pulse bandwidth modulation signals and regulates pin to RGB gray scale.

2. LED drive chip as claimed in claim 1, it is characterized in that, described LED drives regulation integrated circuit to include power module, digital signal extraction module, Logic control module and PWM drive module, the input of described power module is connected with described power pins, the outfan of described power module and digital signal extraction module, Logic control module, PWM drives the power end of module to connect, the input of described digital signal extraction module is connected with described power pins, the outfan of described digital signal extraction module is connected with described Logic control module, the end that controls of described Logic control module drives the input of module to be connected with described PWM, described PWM drives the outfan of module to be connected with described RGB gray scale regulation pin.

3. LED drive chip as claimed in claim 2, it is characterized in that, described LED drives regulation integrated circuit also to include under-voltage locking module and reference voltage module, the input of described under-voltage locking module is connected with the outfan of described power module, the outfan of described under-voltage locking module is connected with the control end of described power module, described reference voltage module is for providing internal reference voltage for described under-voltage locking module, when the voltage of the power supply signal that described power module exports is less than described reference voltage, described power module stops as described digital signal extraction module, Logic control module, PWM drives module for power supply.

4. LED drive chip as claimed in claim 3, it is characterized in that, described LED drives regulation integrated circuit also to include OTP module, described OTP module includes the memory element of the programming address for storing described LED drive chip, and the reading-writing port of described memory element is connected with the reading-writing port of described Logic control module.

5. LED drive chip as claimed in claim 4, it is characterised in that described OTP module also includes the alignment unit of the reference voltage for calibrating described reference voltage inside modules, and the outfan of described alignment unit is connected with the calibration terminal of described reference voltage module.

6. LED drive chip as claimed in claim 2, it is characterised in that described LED driving regulation integrated circuit also includes that current offset module, described current offset module are connected to described power module and described PWM drives between module.

7. LED drive chip as claimed in claim 2, it is characterized in that, described LED drives regulation integrated circuit also to include clock module, the outfan of described clock module is connected with the clock end of described Logic control module, described Logic control module carries out scaling down processing after receiving the clock signal of described clock module, output drives module to described PWM, controls described PWM and drives the dutycycle of module.

8. the LED drive chip as according to any one of claim 1-7, it is characterized in that, described LED drive integrated circult also includes that diode string, the anode tap of described diode string are connected with described grounding pin, and the cathode terminal of described diode string is connected with described power pins.

9. the LED drive chip as according to any one of claim 1-7, it is characterised in that the mode of described driving signal transmission to described power pins uses DMX512 agreement.