CN206993450U

CN206993450U - A kind of LED brightness adjustment controls chip

Info

Publication number: CN206993450U
Application number: CN201720227039.6U
Authority: CN
Inventors: 朱小安; 陈伟; 邵宇
Original assignee: Individual
Current assignee: Shenzhen Core Semiconductor Co ltd
Priority date: 2017-03-09
Filing date: 2017-03-09
Publication date: 2018-02-09
Anticipated expiration: 2027-03-09

Abstract

The utility model discloses a kind of LED brightness adjustment controls chip, including comparator, filtration module, in-line power and state memorization module, Digital Logic and drive module, first NMOS tube and the second NMOS tube, the chip is provided with vdd terminal, first open drain output DRV1, second open drain output DRV2 and GND ends, first output end of Digital Logic and drive module connects the G poles of the first NMOS tube, the D poles of first NMOS tube connect the first open drain output DRV1, second output end of Digital Logic and drive module connects the G poles of the second NMOS tube, the D poles of second NMOS tube connect the second open drain output DRV2, the S poles of first NMOS tube and the S of the second NMOS tube are extremely grounded by GND ends, the utility model has the advantages that：This chip utilizes the voltage of the driving tube (NMOS tube) inside detection chip, reach detection LED whether there is electric current to flow through, determine prime LED driving on off state purpose, compared with prior art, this chip improves detection sensitivity and reliability.

Description

A kind of LED brightness adjustment controls chip

Technical field

LED illumination device field is the utility model is related to, more particularly to a kind of LED brightness adjustment controls chip.

Background technology

LED applications are divided into two major classes of display and illumination, with the novel illumination that light emitting diode (LED) is light source, are referred to as half Conductor illuminates, and abbreviation LED illumination, the industry based on semiconductor lighting is referred to as LED illumination industry.At home industrial policy and Under the dual pulling of international market demand, Chinese LED illumination product market is in accelerated development.At present, global LED production capacities to China's transfer, the LED encapsulation and more than 60% LED applications in the whole world 50% or so are all carried out in China.China turns into the whole world The most fast region of semiconductor lighting industry development.

Different types of LED can send the light of different colours, as the improvement of people's living standards, being wanted to LED illumination Also more and more higher is sought, the LED illumination System for enough adjusting colour temperature is becoming increasingly popular.The color temperature adjusting system of LED illumination is usually There is the LED strip/of multigroup different-colour and link together, one group or several groups is realized by modes such as remote control, wall urban electric power switch LED break-make.Because system cost is low, application method is simple for wall urban electric power switch, by the extensive welcome of client.

General LED illumination System is divided into isolation drive and non-isolated driving two schemes, and the mode of wall urban electric power switch is adjusted The illuminator of section colour temperature can be divided into constant current drive part and colour temperature control section, wherein the on and off of detection wall urban electric power switch Action is crucial.

In LED drive system is isolated, the height of T1 position voltages is detected to judge K1 switch, when K1 is closed, constant current Drive part meeting driving transformer gives LED to power, and T1 voltage can rise；When K1 disconnects, constant current drive part no longer drives change Depressor, T1 voltage can decline.

In LED drive system is isolated, the height for detecting T2 position voltages judges K1 switch, when K1 is closed, T2 Voltage rise, when K1 disconnects, the decline of T2 voltage.

It is higher or lower than a certain threshold voltage by detecting T1/T2 position voltages, control section is it is known that K1's opens Off status, so as to realize the regulation of colour temperature.

Because fluctuation be present in the voltage of power network, no matter T1 or T2 position detecting switch action, be all highly prone to do Disturb, poor sensitivity.Especially T2 partial pressures from high pressure, intrinsic standoff ratio easily cause T2 overtensions greatly very much, burnt below The circuit of colour temperature control section；Intrinsic standoff ratio is too small, then accuracy of detection can be brought poor, the time is long, it is necessary to repeatedly confirm back and forth, pole Easily cause lamp sudden strain of a muscle.

Utility model content

The purpose of this utility model is the drawbacks described above for prior art, there is provided a kind of LED brightness adjustment controls chip.

A kind of LED brightness adjustment controls chip, including comparator, filtration module, in-line power and state memorization module, numeral are patrolled Collect and drive module, the first NMOS tube and the second NMOS tube, the chip are provided with vdd terminal, the first open drain output DRV1, the Two open drain output DRV2 and GND ends, the vdd terminal connection in-line power and state memorization module are powered for chip operation, the The input of one open drain output DRV1, the second open drain output DRV2 and filtration module connects, and the output end of filtration module connects The input of comparator, the output end connection in-line power of the comparator and the input of state memorization module are connect, inside supplies The input of the output end of electricity and state memorization module connection Digital Logic and drive module, the of Digital Logic and drive module One output end connects the G poles of the first NMOS tube, and the D poles of the first NMOS tube connect the first open drain output DRV1, Digital Logic and Second output end of drive module connects the G poles of the second NMOS tube, and the D poles of the second NMOS tube connect the second open drain output DRV2, the S poles of the first NMOS tube and the S of the second NMOS tube are extremely grounded by GND ends.

More specifically, the vdd terminal of the chip connects the prime driving voltage Vled of chip exterior with GND ends.

More specifically, the first open drain output DRV1 is connected in the first LED light group of chip exterior, and second opens Drain output DRV2 is connected in the second LED light group of chip exterior.

More specifically, the prime driving voltage Vled that the vdd terminal of the chip passes through a resistance R1 connection chip exteriors.

Compared with prior art, the utility model has the advantages that：This chip utilizes the driving tube (NMOS inside detection chip Pipe) voltage, reach detection LED and whether there is electric current to flow through, determine the purpose of the on off state of prime LED drivings, it is and existing Technology is compared, and this chip improves detection sensitivity and reliability, while this chip periphery need not connect the members such as resistance or electric capacity Device, save cost.

Brief description of the drawings

Fig. 1 is structural representation of the present utility model.

Fig. 2 is the VA characteristic curve of diode.

Embodiment

Just the utility model is further described with specific embodiment with reference to the accompanying drawings below, but implementation of the present utility model Mode is not limited to this.

As shown in figure 1, a kind of embodiment one of LED brightness adjustment controls chip, chip 1 (the big dotted line frame in Fig. 1) bag Include comparator 11, filtration module 10, in-line power and state memorization module 12, Digital Logic and drive module 13, the first NMOS The NMOS tube 15 of pipe 14 and second, the chip 1 (are provided with vdd terminal, the first open drain output DRV1, the second open drain output DRV2 and GND ends, the vdd terminal connection in-line power and state memorization module are powered for chip operation, the first open drain output DRV1, the second open drain output DRV2 are connected with the input of filtration module 10, the output end connection comparator of filtration module 10 11 input, the output end connection in-line power of the comparator 11 and the input of state memorization module 12, in-line power And the output end of state memorization module 12 connects the input of Digital Logic and drive module 13, Digital Logic and drive module 13 The first output end connect the G poles of the first NMOS tube 14, the D poles of the first NMOS tube 14 connect the first open drain output DRV1, number Second output end of word logic and drive module 13 connects the G poles of the second NMOS tube 15, the D poles connection second of the second NMOS tube 15 Open drain output DRV2, the S of the NMOS tube 15 of S poles 14 and second of the first NMOS tube are extremely grounded by GND ends, wherein internal supply Circuit in the module such as electricity and state memorization module 12, Digital Logic and drive module 13 is prior art, and its principle is herein Do not repeat.

Wherein, the vdd terminal of chip 1 connected with GND ends prime the driving voltage Vled, Vled of chip exterior to chip 1 and The work of LED lamp bead provides driving voltage.

The first open drain output DRV1 is connected in the first LED light group LED1 of chip exterior, and the second open-drain is defeated Go out to hold DRV2 to be connected in the second LED light group LED2 of chip exterior.

Preferably, the vdd terminal of the chip 1 passes through the prime driving voltage Vled of a resistance R1 connection chip exteriors, institute Stating resistance R1 resistance can be adjusted according to Vled magnitude of voltage, it might even be possible to for 0 ohm (not needing resistance R1).

Operation principle：As shown in Fig. 2 the voltage V at LED diodes both ends and flowing through the electric current I formula of LED diodes and being：

It can be seen that LED I and the voltage V exponent function relations for being added in LED both ends, when voltage V is close to Vt, LED two The curent change at end is clearly.

In Fig. 1, when prime drive part loses electricity driving, the voltage Vled being added on LED string can slowly reduce, Due to the C-V characteristic exponentially type relation of light emitting diode, flowing through LED electric current can strongly reduce, therefore flow through driving tube Electric current can also strongly reduce, and the voltage dropped on driving tube also strongly reduces, and chip control circuit is by sampling on driving tube Voltage, after going to disturb, filtering, the state of urban electric power switch can be quickly and accurately known, so as to realize the function of light modulation.

This chip is compared due to directly detecting the current value by LED, more existing detection mode, and this chip is more straight Connect and accurately, reliability and sensitivity are higher, while compared with existing system, chip periphery reduces know clearly multiple resistance, electric capacity Deng periphery component, the cost of system has been saved.

While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art, It is appreciated that these embodiments can be carried out with a variety of changes in the case where not departing from principle and structure of the present utility model, repaiied Change, replace and modification, the scope of the utility model are limited by appended claims and its equivalency range.

Claims

1. a kind of LED brightness adjustment controls chip, including comparator, filtration module, in-line power and state memorization module, Digital Logic And drive module, the first NMOS tube and the second NMOS tube, the chip are provided with vdd terminal, the first open drain output DRV1, second Open drain output DRV2 and GND ends, the vdd terminal connection in-line power and state memorization module are powered for chip operation, and first The input of open drain output DRV1, the second open drain output DRV2 and filtration module connects, the output end connection of filtration module The input of comparator, the output end connection in-line power of the comparator and the input of state memorization module, in-line power And the output end connection Digital Logic of state memorization module and the input of drive module, it is characterised in that Digital Logic and drive First output end of dynamic model block connects the G poles of the first NMOS tube, and the D poles of the first NMOS tube connect the first open drain output DRV1, Second output end of Digital Logic and drive module connects the G poles of the second NMOS tube, and the D poles of the second NMOS tube connect the second open-drain Output end DRV2, the S poles of the first NMOS tube and the S of the second NMOS tube are extremely grounded by GND ends.

2. LED brightness adjustment controls chip according to claim 1, it is characterised in that the vdd terminal of the chip and GND ends connect Meet the prime driving voltage Vled of chip exterior.

3. LED brightness adjustment controls chip according to claim 1, it is characterised in that the first open drain output DRV1 connects The first LED light group for being arranged at chip exterior is connect, the second open drain output DRV2 is connected in the second LED of chip exterior Group.

4. LED brightness adjustment controls chip according to claim 2, it is characterised in that the vdd terminal of the chip passes through a resistance The prime driving voltage Vled of R1 connection chip exteriors.